pdfni 0.1.0

//! 文書モデル（ブロック検出と読み順）

use serde::Serialize;

use crate::columns::{Participant, ParticipantKind, split_regions};
use crate::error::Result;
use crate::extract::ExtractOptions;
use crate::furniture;
use crate::model::{BBox, Cell, Table};
use crate::extract::extract_from_parts;
use crate::reader::read_pages_and_text;
use crate::text::{
    TextChar, TextFont, TextLine, TextPage, TextWord, build_text_lines_with, derotate_xy,
    is_whitespace_str,
};

/// 段落併合の行送り上限（代表 font_size 比）
const PARA_LEADING_FACTOR: f64 = 1.8;
/// 段落併合の代表 font_size 比の上限（大きい方 / 小さい方）
const PARA_FS_RATIO_MAX: f64 = 1.33;
/// 見出し level 1 の本文代表サイズ比
const HEADING_L1_FACTOR: f64 = 1.8;
/// 見出し level 2 の本文代表サイズ比
const HEADING_L2_FACTOR: f64 = 1.4;
/// 見出し level 3 の本文代表サイズ比
const HEADING_L3_FACTOR: f64 = 1.2;
/// 本文代表サイズの丸め単位（pt）
const BODY_FS_BIN: f64 = 0.1;
/// リスト字下げ許容の font_size 比
const LIST_INDENT_FACTOR: f64 = 0.3;
/// リスト字下げ許容の下限 pt
const LIST_INDENT_MIN_PT: f64 = 2.0;

/// 文書全体
#[derive(Debug, Clone, Serialize)]
pub struct DocDoc {
    pub pages: Vec<DocPage>,
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub warnings: Vec<String>,
}

/// 1ページ分の文書モデル
#[derive(Debug, Clone, Serialize)]
pub struct DocPage {
    pub page_number: usize,
    pub width: f64,
    pub height: f64,
    pub fonts: Vec<TextFont>,
    pub chars: Vec<TextChar>,
    pub blocks: Vec<DocBlock>,
}

/// ページ内の1ブロック
#[derive(Debug, Clone, Serialize)]
#[serde(tag = "type")]
pub enum DocBlock {
    #[serde(rename = "table")]
    Table(Table),
    #[serde(rename = "text")]
    Text(TextBlock),
}

/// 本文ブロック
#[derive(Debug, Clone, Serialize)]
pub struct TextBlock {
    #[serde(flatten)]
    pub kind: TextBlockKind,
    #[serde(default, skip_serializing_if = "TextBlockRole::is_body")]
    pub role: TextBlockRole,
    pub text: String,
    pub left: f64,
    pub right: f64,
    pub top: f64,
    pub bottom: f64,
    pub dir: String,
    pub rot: i32,
    pub lines: Vec<TextLine>,
}

/// 本文ブロックの種別
#[derive(Debug, Clone, Serialize, PartialEq, Eq)]
#[serde(tag = "kind")]
pub enum TextBlockKind {
    #[serde(rename = "paragraph")]
    Paragraph,
    #[serde(rename = "heading")]
    Heading { level: u8 },
    #[serde(rename = "list")]
    List { ordered: bool },
}

/// 本文ブロックの役割（ヘッダ・フッタ検出）
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum TextBlockRole {
    #[default]
    Body,
    Header,
    Footer,
}

impl TextBlockRole {
    fn is_body(&self) -> bool {
        *self == TextBlockRole::Body
    }
}

/// 文書単位でヘッダ・フッタの役割を付ける
pub fn assign_header_footer(doc: &mut DocDoc) {
    furniture::assign_header_footer(doc);
}

/// 文書単位でリストを検出する
pub fn assign_lists(doc: &mut DocDoc) {
    for page in &mut doc.pages {
        assign_lists_page(page);
    }
}

/// 文書単位で見出しを推定する
pub fn assign_headings(doc: &mut DocDoc) {
    let Some(body_fs) = body_rep_font_size(doc) else {
        return;
    };

    for page in &mut doc.pages {
        for block in &mut page.blocks {
            let DocBlock::Text(tb) = block else {
                continue;
            };
            if tb.role != TextBlockRole::Body {
                continue;
            }
            if tb.kind != TextBlockKind::Paragraph {
                continue;
            }
            if tb.lines.len() > 2 {
                continue;
            }
            let Some(block_fs) = block_rep_font_size(&page.chars, tb) else {
                continue;
            };
            let level = if block_fs >= body_fs * HEADING_L1_FACTOR {
                1
            } else if block_fs >= body_fs * HEADING_L2_FACTOR {
                2
            } else if block_fs >= body_fs * HEADING_L3_FACTOR {
                3
            } else {
                continue;
            };
            tb.kind = TextBlockKind::Heading { level };
        }
    }
}

/// 文書モデルを Markdown 文字列へ直列化する
pub(crate) fn document_to_markdown(doc: &DocDoc, escape_markdown: bool) -> String {
    let mut parts = Vec::new();
    for page in &doc.pages {
        for block in &page.blocks {
            if let Some(s) = block_to_markdown(block, page, escape_markdown) {
                parts.push(s);
            }
        }
    }
    parts.join("\n\n")
}

/// 1ブロックを Markdown 断片へ変換する。空表・空白のみ本文は None
fn block_to_markdown(block: &DocBlock, page: &DocPage, escape_markdown: bool) -> Option<String> {
    match block {
        DocBlock::Text(tb) => {
            if tb.role != TextBlockRole::Body {
                return None;
            }
            match &tb.kind {
                TextBlockKind::Heading { level } => {
                    let prefix = "#".repeat(*level as usize);
                    let out: Vec<String> = format_text_block_lines(tb, page, escape_markdown)
                        .into_iter()
                        .filter(|l| !l.trim().is_empty())
                        .map(|l| format!("{prefix} {l}"))
                        .collect();
                    if out.is_empty() {
                        return None;
                    }
                    Some(out.join("\n"))
                }
                TextBlockKind::Paragraph => {
                    let body = format_text_block_lines(tb, page, escape_markdown)
                        .into_iter()
                        .filter(|l| !l.trim().is_empty())
                        .collect::<Vec<_>>()
                        .join(HARD_BREAK);
                    if body.trim().is_empty() {
                        return None;
                    }
                    Some(body)
                }
                TextBlockKind::List { ordered } => {
                    list_to_markdown(tb, page, *ordered, escape_markdown)
                }
            }
        }
        DocBlock::Table(table) => table_to_markdown(table),
    }
}

/// 段落内の行を縦に保つハード改行
const HARD_BREAK: &str = "  \n";

/// 見出し・段落本文を行ごとに Markdown 化する（書体があればインライン強調）
/// 行情報が使えない場合は結合済み text の1要素
fn format_text_block_lines(tb: &TextBlock, page: &DocPage, escape_markdown: bool) -> Vec<String> {
    if join_paragraph_text(&tb.lines) == tb.text {
        if let Some(lines) = styled_md_lines(&tb.lines, &page.fonts, &page.chars, escape_markdown)
        {
            return lines;
        }
        let plain = plain_md_lines(&tb.lines, escape_markdown);
        if !plain.is_empty() {
            return plain;
        }
    }
    vec![format_md_body(&tb.text, escape_markdown)]
}

/// 見出し・段落・リスト項目本文のエスケープ適用
fn format_md_body(text: &str, escape_markdown: bool) -> String {
    if escape_markdown {
        escape_text_block_text(text)
    } else {
        sanitize_md_text(text)
    }
}

/// リストの Markdown 直列化
fn list_to_markdown(
    tb: &TextBlock,
    page: &DocPage,
    ordered: bool,
    escape_markdown: bool,
) -> Option<String> {
    let mut out_lines = Vec::new();
    for (num, body_lines) in list_item_body_groups(&tb.lines) {
        let rendered = styled_md_lines(&body_lines, &page.fonts, &page.chars, escape_markdown)
            .unwrap_or_else(|| plain_md_lines(&body_lines, escape_markdown));
        let body = rendered.join(HARD_BREAK);
        if body.trim().is_empty() {
            continue;
        }
        if ordered {
            let Some(n) = num else {
                continue;
            };
            out_lines.push(format!("{n}. {body}"));
        } else {
            out_lines.push(format!("- {body}"));
        }
    }
    if out_lines.is_empty() {
        None
    } else {
        Some(out_lines.join("\n"))
    }
}

/// 書体属性
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct MdStyle {
    bold: bool,
    italic: bool,
}

impl MdStyle {
    fn normal() -> Self {
        Self {
            bold: false,
            italic: false,
        }
    }

    fn is_normal(self) -> bool {
        !self.bold && !self.italic
    }
}

/// 行内の本文断片
enum MdUnit {
    /// グリフ由来の文字列
    Text { text: String, style: MdStyle },
    /// 単語間に挿入する空白
    Gap(String),
}

/// lines から行ごとの書体付き Markdown を組み立てる。強調は行内で閉じる
fn styled_md_lines(
    lines: &[TextLine],
    fonts: &[TextFont],
    chars: &[TextChar],
    escape_markdown: bool,
) -> Option<Vec<String>> {
    if !lines_have_char_refs(lines) {
        return None;
    }
    let mut out = Vec::new();
    for line in lines {
        let units = line_to_md_units(line, fonts, chars)?;
        let runs = coalesce_md_units(&units);
        let rendered = render_md_runs(&runs, escape_markdown);
        if !rendered.trim().is_empty() {
            out.push(rendered);
        }
    }
    Some(out)
}

/// lines から装飾なしの Markdown 行を組み立てる
fn plain_md_lines(lines: &[TextLine], escape_markdown: bool) -> Vec<String> {
    let mut out = Vec::new();
    for line in lines {
        let text = join_line_words(line);
        if text.trim().is_empty() {
            continue;
        }
        out.push(format_md_body(&text, escape_markdown));
    }
    out
}

/// 装飾に使える文字参照があるか
fn lines_have_char_refs(lines: &[TextLine]) -> bool {
    lines
        .iter()
        .any(|l| l.words.iter().any(|w| !w.chars.is_empty()))
}

fn line_to_md_units(
    line: &TextLine,
    fonts: &[TextFont],
    chars: &[TextChar],
) -> Option<Vec<MdUnit>> {
    let mut units = Vec::new();
    for (i, word) in line.words.iter().enumerate() {
        if i > 0 {
            units.push(MdUnit::Gap(" ".into()));
        }
        units.extend(word_to_md_units(word, fonts, chars)?);
    }
    Some(units)
}

fn word_to_md_units(
    word: &TextWord,
    fonts: &[TextFont],
    chars: &[TextChar],
) -> Option<Vec<MdUnit>> {
    if word.chars.is_empty() {
        if word.text.is_empty() {
            return Some(Vec::new());
        }
        // 文字参照が無く本文だけある単語は復元不能
        return None;
    }
    let mut units = Vec::with_capacity(word.chars.len());
    let mut rebuilt = String::new();
    for &ci in &word.chars {
        let Some(ch) = chars.get(ci as usize) else {
            // 不正な文字インデックス
            return None;
        };
        let style = md_style_of_font(fonts, ch.font);
        rebuilt.push_str(&ch.text);
        units.push(MdUnit::Text {
            text: ch.text.clone(),
            style,
        });
    }
    if rebuilt != word.text {
        return None;
    }
    Some(units)
}

fn md_style_of_font(fonts: &[TextFont], font_idx: u32) -> MdStyle {
    match fonts.get(font_idx as usize) {
        Some(f) => MdStyle {
            bold: f.bold,
            italic: f.italic,
        },
        None => MdStyle::normal(),
    }
}

/// 同一書体の断片を結合し、間の挿入空白を区間へ取り込む
fn coalesce_md_units(units: &[MdUnit]) -> Vec<(String, MdStyle)> {
    let mut runs: Vec<(String, MdStyle)> = Vec::new();
    let mut pending_gap = String::new();

    for unit in units {
        match unit {
            MdUnit::Gap(g) => pending_gap.push_str(g),
            MdUnit::Text { text, style } => {
                if text.is_empty() {
                    continue;
                }
                if let Some((last_text, last_style)) = runs.last_mut() {
                    if *last_style == *style {
                        last_text.push_str(&pending_gap);
                        last_text.push_str(text);
                        pending_gap.clear();
                        continue;
                    }
                }
                if !pending_gap.is_empty() {
                    if let Some((last_text, last_style)) = runs.last_mut() {
                        if last_style.is_normal() {
                            last_text.push_str(&pending_gap);
                        } else {
                            runs.push((std::mem::take(&mut pending_gap), MdStyle::normal()));
                        }
                    } else {
                        runs.push((std::mem::take(&mut pending_gap), MdStyle::normal()));
                    }
                    pending_gap.clear();
                }
                if let Some((last_text, last_style)) = runs.last_mut() {
                    if *last_style == *style {
                        last_text.push_str(text);
                        continue;
                    }
                }
                runs.push((text.clone(), *style));
            }
        }
    }
    if !pending_gap.is_empty() {
        if let Some((last_text, last_style)) = runs.last_mut() {
            if last_style.is_normal() {
                last_text.push_str(&pending_gap);
            } else {
                runs.push((pending_gap, MdStyle::normal()));
            }
        } else {
            runs.push((pending_gap, MdStyle::normal()));
        }
    }
    runs
}

/// 書体区間を Markdown 強調付き文字列へ直列化する
fn render_md_runs(runs: &[(String, MdStyle)], escape_markdown: bool) -> String {
    let mut out = String::new();
    for (text, style) in runs {
        out.push_str(&render_md_run(text, *style, escape_markdown));
    }
    out
}

fn render_md_run(text: &str, style: MdStyle, escape_markdown: bool) -> String {
    if style.is_normal() {
        return format_md_body(text, escape_markdown);
    }
    // 区間端の空白は強調の外へ出す
    let lead = text.chars().take_while(|&c| c == ' ').count();
    let trail = text
        .chars()
        .rev()
        .take_while(|&c| c == ' ')
        .count()
        .min(text.chars().count().saturating_sub(lead));
    let core: String = text
        .chars()
        .skip(lead)
        .take(text.chars().count() - lead - trail)
        .collect();
    let mut out = String::with_capacity(text.len() + 6);
    for _ in 0..lead {
        out.push(' ');
    }
    if !core.is_empty() {
        let body = format_md_body(&core, escape_markdown);
        let marker = if style.bold && style.italic {
            "***"
        } else if style.bold {
            "**"
        } else {
            "*"
        };
        out.push_str(marker);
        out.push_str(&body);
        out.push_str(marker);
    }
    for _ in 0..trail {
        out.push(' ');
    }
    out
}

/// リスト項目の番号とマーカー除去後の本文行
fn list_item_body_groups(lines: &[TextLine]) -> Vec<(Option<u32>, Vec<TextLine>)> {
    let mut entries = Vec::new();
    let mut i = 0;
    while i < lines.len() {
        if list_marker_kind(&lines[i]).is_none() {
            i += 1;
            continue;
        }
        let num = match list_marker_kind(&lines[i]) {
            Some(ListMarkerKind::Ordered { n, .. }) => Some(n),
            _ => None,
        };
        let start = i;
        i += 1;
        while i < lines.len() && list_marker_kind(&lines[i]).is_none() {
            i += 1;
        }
        let body_lines = list_item_body_lines(&lines[start..i]);
        entries.push((num, body_lines));
    }
    entries
}

/// GFM パイプテーブルへ直列化する
fn table_to_markdown(table: &Table) -> Option<String> {
    if table.n_rows == 0 || table.n_cols == 0 {
        return None;
    }
    let n_cols = table.n_cols;
    let mut lines = Vec::with_capacity(table.data.len().max(1) + 1);

    let header = table.data.first().map(|r| r.as_slice()).unwrap_or(&[]);
    lines.push(format_table_row(header, n_cols));

    let mut sep = String::from("|");
    for _ in 0..n_cols {
        sep.push_str(" --- |");
    }
    lines.push(sep);

    for row in table.data.iter().skip(1) {
        lines.push(format_table_row(row, n_cols));
    }

    Some(lines.join("\n"))
}

/// 表の1行をパイプ区切りで組み立てる
fn format_table_row(row: &[Cell], n_cols: usize) -> String {
    let mut s = String::from("|");
    for i in 0..n_cols {
        s.push(' ');
        if let Some(cell) = row.get(i) {
            s.push_str(&escape_cell_text(&cell.text));
        }
        s.push_str(" |");
    }
    s
}

/// セル text の制御文字置換と GFM エスケープ
fn escape_cell_text(text: &str) -> String {
    let sanitized = sanitize_md_text(text);
    let mut out = String::with_capacity(sanitized.len());
    for c in sanitized.chars() {
        match c {
            '\\' => out.push_str("\\\\"),
            '|' => out.push_str("\\|"),
            _ => out.push(c),
        }
    }
    out
}

/// 見出し・段落 text の制御文字置換と本文エスケープ
fn escape_text_block_text(text: &str) -> String {
    let sanitized = sanitize_md_text(text);
    let mut body = String::with_capacity(sanitized.len() + 1);
    for c in sanitized.chars() {
        if c == '\\' {
            body.push_str("\\\\");
        } else {
            body.push(c);
        }
    }
    // 先頭の連続 U+0020 直後のブロック構文文字を1文字だけエスケープする
    let n_space = body.bytes().take_while(|&b| b == b' ').count();
    if let Some(first) = body[n_space..].chars().next() {
        if matches!(first, '#' | '*' | '-' | '+' | '>' | '|') {
            let mut out = String::with_capacity(body.len() + 1);
            out.push_str(&body[..n_space]);
            out.push('\\');
            out.push_str(&body[n_space..]);
            return out;
        }
    }
    body
}

/// 改行・タブ・C0 制御文字を U+0020 へ置換する
pub(crate) fn sanitize_md_text(text: &str) -> String {
    text.chars()
        .map(|c| if is_md_control_char(c) { ' ' } else { c })
        .collect()
}

/// Markdown 直列化で空白へ置換する制御文字か
fn is_md_control_char(c: char) -> bool {
    matches!(c, '\u{0000}'..='\u{001F}' | '\u{2028}' | '\u{2029}')
}

/// PDF バイト列から Markdown 文字列を1発で生成する
pub fn extract_markdown_from_bytes(
    data: &[u8],
    password: Option<&str>,
    options: &ExtractOptions,
) -> Result<String> {
    let doc = extract_document_from_bytes(data, password, options)?;
    Ok(document_to_markdown(&doc, options.escape_markdown))
}

/// PDF バイト列から見出し推定済みの文書モデルを構築する
pub fn extract_document_from_bytes(
    data: &[u8],
    password: Option<&str>,
    options: &ExtractOptions,
) -> Result<DocDoc> {
    let (parts, text_pages, warnings) = read_pages_and_text(data, password, &options.reader)?;
    let tables_doc = extract_from_parts(parts, options);

    let mut pages = Vec::with_capacity(text_pages.len());
    for (i, (page, text_page)) in tables_doc
        .pages
        .into_iter()
        .zip(text_pages.into_iter())
        .enumerate()
    {
        let blocks = build_blocks_owned(&text_page, page.tables, options.bidi);
        pages.push(DocPage {
            page_number: i + 1,
            width: text_page.width,
            height: text_page.height,
            fonts: text_page.fonts,
            chars: text_page.chars,
            blocks,
        });
    }

    let mut doc = DocDoc { pages, warnings };
    if options.detect_header_footer {
        assign_header_footer(&mut doc);
    }
    if options.detect_lists {
        assign_lists(&mut doc);
    }
    assign_headings(&mut doc);
    Ok(doc)
}

/// 本文代表 font_size（0.1pt 丸め最頻値。同数タイは小さい方）
fn body_rep_font_size(doc: &DocDoc) -> Option<f64> {
    let mut counts: std::collections::HashMap<i64, usize> = std::collections::HashMap::new();
    for page in &doc.pages {
        for block in &page.blocks {
            let DocBlock::Text(tb) = block else {
                continue;
            };
            if tb.role != TextBlockRole::Body {
                continue;
            }
            for line in &tb.lines {
                for &idx in &line.chars {
                    let ch = &page.chars[idx as usize];
                    if is_whitespace_str(&ch.text) {
                        continue;
                    }
                    let fs = ch.font_size;
                    if fs.is_finite() && fs > 0.0 {
                        let key = (fs / BODY_FS_BIN).round() as i64;
                        *counts.entry(key).or_insert(0) += 1;
                    }
                }
            }
        }
    }
    if counts.is_empty() {
        return None;
    }
    let mut best_key = i64::MAX;
    let mut best_count = 0usize;
    for (&key, &count) in &counts {
        if count > best_count || (count == best_count && key < best_key) {
            best_count = count;
            best_key = key;
        }
    }
    Some(best_key as f64 * BODY_FS_BIN)
}

/// ブロック構成行の代表 font_size の中央値
pub(crate) fn block_rep_font_size(chars: &[TextChar], tb: &TextBlock) -> Option<f64> {
    let mut vals = Vec::with_capacity(tb.lines.len());
    for line in &tb.lines {
        let fs = line_rep_font_size(chars, line)?;
        vals.push(fs);
    }
    median_f64(&mut vals)
}

/// ページの行と表から読み順付きブロック列を構築する
pub fn build_blocks(page: &TextPage, tables: &[Table]) -> Vec<DocBlock> {
    build_blocks_owned(page, tables.to_vec(), false)
}

/// 表を所有権ごと受け取りブロック列を構築する
fn build_blocks_owned(page: &TextPage, tables: Vec<Table>, bidi: bool) -> Vec<DocBlock> {
    let valid_cells = collect_valid_cells(&tables);
    let raw_lines = build_text_lines_with(page, bidi);
    let body_lines: Vec<TextLine> = raw_lines
        .into_iter()
        .filter_map(|line| filter_table_owned_line(page, line, &valid_cells))
        .collect();

    let (parts, word_part_ids, table_part_ids, other_part_ids) =
        collect_participants(&body_lines, &tables);

    if let Some(leaf_of) = split_regions(page.width, page.height, &parts) {
        return build_blocks_with_regions(
            page,
            body_lines,
            tables,
            &leaf_of,
            &word_part_ids,
            &table_part_ids,
            &other_part_ids,
        );
    }

    let text_blocks = build_text_blocks(page, body_lines);

    let n_tables = tables.len();
    let mut keyed: Vec<(f64, f64, usize, DocBlock)> =
        Vec::with_capacity(n_tables + text_blocks.len());
    for (i, table) in tables.into_iter().enumerate() {
        let top = table.bbox.top;
        let left = table.bbox.x0;
        keyed.push((top, left, i, DocBlock::Table(table)));
    }
    let mut gen_no = n_tables;
    for tb in text_blocks {
        let top = tb.top;
        let left = tb.left;
        keyed.push((top, left, gen_no, DocBlock::Text(tb)));
        gen_no += 1;
    }

    keyed.sort_by(|a, b| {
        a.0.total_cmp(&b.0)
            .then_with(|| a.1.total_cmp(&b.1))
            .then_with(|| a.2.cmp(&b.2))
    });
    keyed.into_iter().map(|(_, _, _, b)| b).collect()
}

/// 対象本文行か（横書き・正立）
fn is_target_body_line(line: &TextLine) -> bool {
    line.dir == "ltr" && line.rot == 0
}

/// 参加要素列を安定ID順で構築する
fn collect_participants(
    body_lines: &[TextLine],
    tables: &[Table],
) -> (
    Vec<Participant>,
    Vec<Vec<usize>>,
    Vec<usize>,
    Vec<Option<usize>>,
) {
    let mut parts = Vec::new();
    let mut word_part_ids: Vec<Vec<usize>> = vec![Vec::new(); body_lines.len()];
    let mut other_part_ids: Vec<Option<usize>> = vec![None; body_lines.len()];
    let mut table_part_ids = Vec::with_capacity(tables.len());

    for (li, line) in body_lines.iter().enumerate() {
        if !is_target_body_line(line) {
            continue;
        }
        for word in &line.words {
            let id = parts.len();
            word_part_ids[li].push(id);
            parts.push(Participant {
                left: word.left,
                right: word.right,
                top: word.top,
                bottom: word.bottom,
                kind: ParticipantKind::Word { line: li },
            });
        }
    }
    for table in tables {
        let id = parts.len();
        table_part_ids.push(id);
        parts.push(Participant {
            left: table.bbox.x0,
            right: table.bbox.x1,
            top: table.bbox.top,
            bottom: table.bbox.bottom,
            kind: ParticipantKind::Table,
        });
    }
    for (li, line) in body_lines.iter().enumerate() {
        if is_target_body_line(line) {
            continue;
        }
        let id = parts.len();
        other_part_ids[li] = Some(id);
        parts.push(Participant {
            left: line.left,
            right: line.right,
            top: line.top,
            bottom: line.bottom,
            kind: ParticipantKind::OtherLine,
        });
    }

    (parts, word_part_ids, table_part_ids, other_part_ids)
}

/// X分割ありのページで葉領域ごとにブロック列を構築する
fn build_blocks_with_regions(
    page: &TextPage,
    body_lines: Vec<TextLine>,
    tables: Vec<Table>,
    leaf_of: &[usize],
    word_part_ids: &[Vec<usize>],
    table_part_ids: &[usize],
    other_part_ids: &[Option<usize>],
) -> Vec<DocBlock> {
    let n_leaves = leaf_of.iter().copied().max().map(|m| m + 1).unwrap_or(0);
    let mut leaf_lines: Vec<Vec<TextLine>> = (0..n_leaves).map(|_| Vec::new()).collect();

    for (li, line) in body_lines.into_iter().enumerate() {
        if is_target_body_line(&line) {
            let word_leaves: Vec<usize> =
                word_part_ids[li].iter().map(|&pid| leaf_of[pid]).collect();
            for (leaf, frag) in reconstitute_line_by_leaves(page, line, &word_leaves) {
                if leaf < leaf_lines.len() {
                    leaf_lines[leaf].push(frag);
                }
            }
        } else if let Some(pid) = other_part_ids[li] {
            let leaf = leaf_of[pid];
            if leaf < leaf_lines.len() {
                leaf_lines[leaf].push(line);
            }
        }
    }

    let n_tables = tables.len();
    let mut keyed: Vec<(usize, f64, f64, usize, DocBlock)> = Vec::new();

    for (i, table) in tables.into_iter().enumerate() {
        let leaf = leaf_of[table_part_ids[i]];
        let top = table.bbox.top;
        let left = table.bbox.x0;
        keyed.push((leaf, top, left, i, DocBlock::Table(table)));
    }

    let mut gen_no = n_tables;
    for (leaf, lines) in leaf_lines.into_iter().enumerate() {
        if lines.is_empty() {
            continue;
        }
        let text_blocks = build_text_blocks(page, lines);
        for tb in text_blocks {
            let top = tb.top;
            let left = tb.left;
            keyed.push((leaf, top, left, gen_no, DocBlock::Text(tb)));
            gen_no += 1;
        }
    }

    keyed.sort_by(|a, b| {
        a.0.cmp(&b.0)
            .then_with(|| a.1.total_cmp(&b.1))
            .then_with(|| a.2.total_cmp(&b.2))
            .then_with(|| a.3.cmp(&b.3))
    });
    keyed.into_iter().map(|(_, _, _, _, b)| b).collect()
}

/// 対象本文行を葉ごとの行断片へ振り分ける
fn reconstitute_line_by_leaves(
    page: &TextPage,
    line: TextLine,
    word_leaves: &[usize],
) -> Vec<(usize, TextLine)> {
    if line.words.is_empty() || word_leaves.is_empty() {
        return Vec::new();
    }
    debug_assert_eq!(line.words.len(), word_leaves.len());

    let first = word_leaves[0];
    if word_leaves.iter().all(|&l| l == first) {
        return vec![(first, line)];
    }

    // 各グリフが属する単語（無ければ単語外）
    let mut char_word: Vec<(u32, usize)> = Vec::new();
    for (wi, w) in line.words.iter().enumerate() {
        for &c in &w.chars {
            char_word.push((c, wi));
        }
    }
    char_word.sort_unstable_by_key(|&(c, _)| c);

    let find_word = |cidx: u32| -> Option<usize> {
        char_word
            .binary_search_by_key(&cidx, |&(c, _)| c)
            .ok()
            .map(|i| char_word[i].1)
    };

    // 葉の出現順（語順）
    let mut leaf_order: Vec<usize> = Vec::new();
    for &l in word_leaves {
        if !leaf_order.contains(&l) {
            leaf_order.push(l);
        }
    }

    // 単語外空白の葉（進行軸順で直前語、行頭は直後語）
    let mut free_ws_leaf: Vec<(u32, usize)> = Vec::new();
    let mut last_word: Option<usize> = None;
    for (pos, &cidx) in line.chars.iter().enumerate() {
        if let Some(wi) = find_word(cidx) {
            last_word = Some(wi);
            continue;
        }
        if !is_whitespace_str(&page.chars[cidx as usize].text) {
            continue;
        }
        if let Some(wi) = last_word {
            free_ws_leaf.push((cidx, word_leaves[wi]));
        } else {
            let mut next = None;
            for &c2 in &line.chars[pos + 1..] {
                if let Some(wi) = find_word(c2) {
                    next = Some(wi);
                    break;
                }
            }
            if let Some(wi) = next {
                free_ws_leaf.push((cidx, word_leaves[wi]));
            }
        }
    }
    free_ws_leaf.sort_unstable_by_key(|&(c, _)| c);

    let free_leaf = |cidx: u32| -> Option<usize> {
        free_ws_leaf
            .binary_search_by_key(&cidx, |&(c, _)| c)
            .ok()
            .map(|i| free_ws_leaf[i].1)
    };

    // 元の line.chars 順を保って各葉へ積む
    let mut chars_by_leaf: Vec<Vec<u32>> = vec![Vec::new(); leaf_order.len()];
    let leaf_slot = |leaf: usize| -> Option<usize> { leaf_order.iter().position(|&l| l == leaf) };
    for &cidx in &line.chars {
        let leaf = if let Some(wi) = find_word(cidx) {
            word_leaves[wi]
        } else if let Some(l) = free_leaf(cidx) {
            l
        } else {
            continue;
        };
        if let Some(slot) = leaf_slot(leaf) {
            chars_by_leaf[slot].push(cidx);
        }
    }

    let mut out = Vec::new();
    for (slot, &leaf) in leaf_order.iter().enumerate() {
        let words: Vec<TextWord> = line
            .words
            .iter()
            .zip(word_leaves.iter())
            .filter(|(_, l)| **l == leaf)
            .map(|(w, _)| w.clone())
            .collect();
        if words.is_empty() {
            continue;
        }
        let chars = chars_by_leaf[slot].clone();
        let Some((left, right, top, bottom)) = non_ws_union_bbox(page, &chars) else {
            continue;
        };
        out.push((
            leaf,
            TextLine {
                left,
                right,
                top,
                bottom,
                dir: line.dir.clone(),
                rot: line.rot,
                words,
                chars,
            },
        ));
    }
    out
}

/// 有効セルの bbox を集める
fn collect_valid_cells(tables: &[Table]) -> Vec<BBox> {
    let mut out = Vec::new();
    for table in tables {
        for cell in table.data.iter().flatten() {
            if cell.text.is_empty() {
                continue;
            }
            if cell.bbox.width() <= 0.0 || cell.bbox.height() <= 0.0 {
                continue;
            }
            out.push(cell.bbox);
        }
    }
    out
}

/// 表所有グリフを除いた行を返す
fn filter_table_owned_line(page: &TextPage, line: TextLine, cells: &[BBox]) -> Option<TextLine> {
    if cells.is_empty() {
        return Some(line);
    }

    let mut any_owned = false;
    let mut any_free_non_ws = false;
    let mut owned_idx = std::collections::HashSet::new();
    for &idx in &line.chars {
        let ch = &page.chars[idx as usize];
        let owned = glyph_table_owned(ch, cells);
        if owned {
            any_owned = true;
            owned_idx.insert(idx);
        } else if !is_whitespace_str(&ch.text) {
            any_free_non_ws = true;
        }
    }
    if !any_free_non_ws {
        return None;
    }
    if !any_owned {
        return Some(line);
    }

    let new_chars: Vec<u32> = line
        .chars
        .into_iter()
        .filter(|idx| !owned_idx.contains(idx))
        .collect();

    let mut new_words = Vec::new();
    for word in line.words {
        let wchars: Vec<u32> = word
            .chars
            .into_iter()
            .filter(|idx| !owned_idx.contains(idx))
            .collect();
        if let Some(w) = remake_word(page, &wchars) {
            new_words.push(w);
        }
    }
    if new_words.is_empty() {
        return None;
    }

    let (left, right, top, bottom) = non_ws_union_bbox(page, &new_chars)?;
    Some(TextLine {
        left,
        right,
        top,
        bottom,
        dir: line.dir,
        rot: line.rot,
        words: new_words,
        chars: new_chars,
    })
}

/// グリフ中心が有効セルに含まれるか
fn glyph_table_owned(ch: &TextChar, cells: &[BBox]) -> bool {
    let cx = (ch.left + ch.right) / 2.0;
    let cy = (ch.top + ch.bottom) / 2.0;
    cells.iter().any(|c| c.contains_point(cx, cy))
}

/// 残存グリフから単語を再構成する
fn remake_word(page: &TextPage, chars: &[u32]) -> Option<TextWord> {
    if chars.is_empty() {
        return None;
    }
    let mut left = f64::INFINITY;
    let mut right = f64::NEG_INFINITY;
    let mut top = f64::INFINITY;
    let mut bottom = f64::NEG_INFINITY;
    let mut any = false;
    let mut text = String::new();
    let mut out_chars = Vec::with_capacity(chars.len());
    for &i in chars {
        let ch = &page.chars[i as usize];
        out_chars.push(i);
        text.push_str(&ch.text);
        if is_whitespace_str(&ch.text) {
            continue;
        }
        any = true;
        left = left.min(ch.left);
        right = right.max(ch.right);
        top = top.min(ch.top);
        bottom = bottom.max(ch.bottom);
    }
    if !any {
        return None;
    }
    Some(TextWord {
        text,
        left,
        right,
        top,
        bottom,
        chars: out_chars,
    })
}

/// 非空白グリフ bbox の和集合
fn non_ws_union_bbox(page: &TextPage, chars: &[u32]) -> Option<(f64, f64, f64, f64)> {
    let mut left = f64::INFINITY;
    let mut right = f64::NEG_INFINITY;
    let mut top = f64::INFINITY;
    let mut bottom = f64::NEG_INFINITY;
    let mut any = false;
    for &i in chars {
        let ch = &page.chars[i as usize];
        if is_whitespace_str(&ch.text) {
            continue;
        }
        any = true;
        left = left.min(ch.left);
        right = right.max(ch.right);
        top = top.min(ch.top);
        bottom = bottom.max(ch.bottom);
    }
    if any {
        Some((left, right, top, bottom))
    } else {
        None
    }
}

/// 行の代表値（ソート・併合で使い回す）
struct LineRep {
    baseline: f64,
    font_size: Option<f64>,
    progress: (f64, f64),
    stream_index: u32,
}

/// 本文行から段落ブロックを生成する
fn build_text_blocks(page: &TextPage, lines: Vec<TextLine>) -> Vec<TextBlock> {
    if lines.is_empty() {
        return Vec::new();
    }

    // 書字方向グループ (dir, rot) ごとに最小 chars インデックスを求める
    let mut group_keys: Vec<(String, i32)> = Vec::new();
    let mut group_lines: Vec<Vec<(LineRep, TextLine)>> = Vec::new();
    let mut group_min: Vec<u32> = Vec::new();
    let mut key_pos: std::collections::HashMap<(String, i32), usize> =
        std::collections::HashMap::new();

    for line in lines {
        let key = (line.dir.clone(), line.rot);
        let rep = LineRep {
            baseline: line_rep_baseline(page, &line),
            font_size: line_rep_font_size(&page.chars, &line),
            progress: line_progress_interval(page, &line),
            stream_index: line_stream_index(&line),
        };
        let min_idx = rep.stream_index;
        if let Some(&pos) = key_pos.get(&key) {
            group_min[pos] = group_min[pos].min(min_idx);
            group_lines[pos].push((rep, line));
        } else {
            let pos = group_keys.len();
            key_pos.insert(key.clone(), pos);
            group_keys.push(key);
            group_min.push(min_idx);
            group_lines.push(vec![(rep, line)]);
        }
    }

    let mut order: Vec<usize> = (0..group_keys.len()).collect();
    order.sort_by(|&a, &b| group_min[a].cmp(&group_min[b]).then_with(|| a.cmp(&b)));

    let mut blocks = Vec::new();
    for gi in order {
        let mut glines = std::mem::take(&mut group_lines[gi]);
        glines.sort_by(|a, b| {
            a.0.baseline
                .total_cmp(&b.0.baseline)
                .then_with(|| a.0.stream_index.cmp(&b.0.stream_index))
        });

        let mut para: Vec<TextLine> = Vec::new();
        let mut prev_rep: Option<LineRep> = None;
        for (rep, line) in glines {
            if para.is_empty() {
                para.push(line);
                prev_rep = Some(rep);
                continue;
            }
            let prev = prev_rep.as_ref().unwrap();
            if can_merge_line_reps(prev, &rep) {
                para.push(line);
                prev_rep = Some(rep);
            } else {
                blocks.push(make_text_block(std::mem::take(&mut para)));
                para.push(line);
                prev_rep = Some(rep);
            }
        }
        if !para.is_empty() {
            blocks.push(make_text_block(para));
        }
    }
    blocks
}

/// 隣接2行を1段落に併合できるか
fn can_merge_line_reps(a: &LineRep, b: &LineRep) -> bool {
    let Some(fs_a) = a.font_size else {
        return false;
    };
    let Some(fs_b) = b.font_size else {
        return false;
    };
    let gap = (b.baseline - a.baseline).abs();
    if gap > fs_a.max(fs_b) * PARA_LEADING_FACTOR {
        return false;
    }
    if !intervals_overlap(a.progress, b.progress) {
        return false;
    }
    let lo = fs_a.min(fs_b);
    let hi = fs_a.max(fs_b);
    if lo <= 0.0 {
        return false;
    }
    let ratio = hi / lo;
    ratio <= PARA_FS_RATIO_MAX
}

/// 行群から TextBlock を組み立てる
fn make_text_block(lines: Vec<TextLine>) -> TextBlock {
    let dir = lines[0].dir.clone();
    let rot = lines[0].rot;
    let text = join_paragraph_text(&lines);
    let mut left = f64::INFINITY;
    let mut right = f64::NEG_INFINITY;
    let mut top = f64::INFINITY;
    let mut bottom = f64::NEG_INFINITY;
    for line in &lines {
        left = left.min(line.left);
        right = right.max(line.right);
        top = top.min(line.top);
        bottom = bottom.max(line.bottom);
    }
    TextBlock {
        kind: TextBlockKind::Paragraph,
        role: TextBlockRole::Body,
        text,
        left,
        right,
        top,
        bottom,
        dir,
        rot,
        lines,
    }
}

/// 段落内の行を結合して本文文字列を作る
fn join_paragraph_text(lines: &[TextLine]) -> String {
    if lines.is_empty() {
        return String::new();
    }
    let mut out = join_line_words(&lines[0]);
    for i in 1..lines.len() {
        let prev = &lines[i - 1];
        let next = &lines[i];
        let next_str = join_line_words(next);
        let prev_last = prev.words.last().and_then(|w| w.text.chars().last());
        let next_first = next.words.first().and_then(|w| w.text.chars().next());
        match (prev_last, next_first) {
            (Some('\u{00AD}'), _) => {
                if out.ends_with('\u{00AD}') {
                    out.pop();
                }
                out.push_str(&next_str);
            }
            (Some('-'), Some(nf)) => {
                let before = prev.words.last().and_then(|w| {
                    let mut it = w.text.chars().rev();
                    let _hyphen = it.next();
                    it.next()
                });
                if before.is_some_and(is_latin_letter) && is_latin_letter(nf) && nf.is_lowercase() {
                    if out.ends_with('-') {
                        out.pop();
                    }
                    out.push_str(&next_str);
                } else {
                    out.push_str(&next_str);
                }
            }
            (Some(pl), Some(nf)) if is_cjk(pl) || is_cjk(nf) => {
                out.push_str(&next_str);
            }
            (Some(_), Some(_)) => {
                out.push(' ');
                out.push_str(&next_str);
            }
            _ => {
                if !next_str.is_empty() {
                    if !out.is_empty() {
                        out.push(' ');
                    }
                    out.push_str(&next_str);
                }
            }
        }
    }
    out
}

/// 行内単語を空白で連結する
fn join_line_words(line: &TextLine) -> String {
    let mut s = String::new();
    for (i, w) in line.words.iter().enumerate() {
        if i > 0 {
            s.push(' ');
        }
        s.push_str(&w.text);
    }
    s
}

/// ページ内のリスト検出
fn assign_lists_page(page: &mut DocPage) {
    let blocks = std::mem::take(&mut page.blocks);
    let mut out = Vec::with_capacity(blocks.len());
    let mut iter = blocks.into_iter().peekable();
    while let Some(block) = iter.next() {
        match block {
            DocBlock::Text(tb)
                if tb.role == TextBlockRole::Body && tb.kind == TextBlockKind::Paragraph =>
            {
                let mut run: Vec<TextBlock> = vec![tb];
                while let Some(DocBlock::Text(next)) = iter.peek() {
                    if next.role != TextBlockRole::Body
                        || next.kind != TextBlockKind::Paragraph
                        || next.dir != run[0].dir
                        || next.rot != run[0].rot
                    {
                        break;
                    }
                    if let Some(DocBlock::Text(next_tb)) = iter.next() {
                        run.push(next_tb);
                    }
                }
                out.extend(detect_lists_in_run(run, &page.chars));
            }
            other => out.push(other),
        }
    }
    page.blocks = out;
}

/// 番号マーカーの記号型
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum OrderedMarkerStyle {
    /// `1.`
    Dot,
    /// `1)`
    Paren,
    /// `(1)`
    LParen,
}

/// リストマーカー種別
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum ListMarkerKind {
    Bullet,
    Ordered { style: OrderedMarkerStyle, n: u32 },
}

/// 連続ラン内のリスト検出と非成立部の元ブロック保持
fn detect_lists_in_run(run: Vec<TextBlock>, chars: &[TextChar]) -> Vec<DocBlock> {
    let mut lines: Vec<TextLine> = Vec::new();
    let mut origin: Vec<usize> = Vec::new();
    for (bi, block) in run.iter().enumerate() {
        for line in &block.lines {
            lines.push(line.clone());
            origin.push(bi);
        }
    }
    let n = lines.len();
    let mut consumed = vec![false; n];
    let mut list_at: std::collections::HashMap<usize, TextBlock> = std::collections::HashMap::new();

    let mut i = 0;
    while i < n {
        let Some(start_kind) = list_marker_kind(&lines[i]) else {
            i += 1;
            continue;
        };
        let run_left = lines[i].left;
        let ordered = matches!(start_kind, ListMarkerKind::Ordered { .. });
        let mut last_marker: Option<ListMarkerKind> = None;
        let mut items: Vec<Vec<TextLine>> = Vec::new();
        let mut item_indices: Vec<Vec<usize>> = Vec::new();
        let mut j = i;
        while j < n {
            let Some(kind) = list_marker_kind(&lines[j]) else {
                break;
            };
            if !marker_continues_run(last_marker, kind) {
                break;
            }
            if !list_lefts_aligned(run_left, lines[j].left, chars, &lines[i], &lines[j]) {
                break;
            }
            last_marker = Some(kind);
            let marker_left = lines[j].left;
            let marker_fs = line_rep_font_size(chars, &lines[j]);
            let mut item = vec![lines[j].clone()];
            let mut idx = vec![j];
            j += 1;
            while j < n && list_marker_kind(&lines[j]).is_none() {
                let prev = item.last().unwrap();
                if is_hang_continuation(chars, prev, &lines[j], marker_left, marker_fs) {
                    item.push(lines[j].clone());
                    idx.push(j);
                    j += 1;
                } else {
                    break;
                }
            }
            items.push(item);
            item_indices.push(idx);
        }

        if items.len() >= 2 {
            let start_idx = item_indices[0][0];
            for idxs in &item_indices {
                for &fi in idxs {
                    consumed[fi] = true;
                }
            }
            list_at.insert(start_idx, make_list_block(items, ordered));
            i = j;
        } else {
            i += 1;
        }
    }

    let mut block_untouched = vec![true; run.len()];
    for i in 0..n {
        if consumed[i] {
            block_untouched[origin[i]] = false;
        }
    }
    let mut run_opt: Vec<Option<TextBlock>> = run.into_iter().map(Some).collect();

    let mut out: Vec<DocBlock> = Vec::new();
    let mut idx = 0;
    while idx < n {
        if consumed[idx] {
            if let Some(lb) = list_at.remove(&idx) {
                out.push(DocBlock::Text(lb));
            }
            idx += 1;
            while idx < n && consumed[idx] && !list_at.contains_key(&idx) {
                idx += 1;
            }
        } else {
            let bi = origin[idx];
            if block_untouched[bi] {
                let block = run_opt[bi].take().expect("無傷ブロックは未取得");
                let block_len = block.lines.len();
                out.push(DocBlock::Text(block));
                idx += block_len;
            } else {
                let mut group_lines: Vec<TextLine> = Vec::new();
                while idx < n && !consumed[idx] && origin[idx] == bi {
                    group_lines.push(lines[idx].clone());
                    idx += 1;
                }
                if !group_lines.is_empty() {
                    out.push(DocBlock::Text(make_text_block(group_lines)));
                }
            }
        }
    }
    out
}

/// リスト区間へのマーカー追加可否
fn marker_continues_run(last: Option<ListMarkerKind>, kind: ListMarkerKind) -> bool {
    match (last, kind) {
        (None, _) => true,
        (Some(ListMarkerKind::Bullet), ListMarkerKind::Bullet) => true,
        (
            Some(ListMarkerKind::Ordered { style: s0, n: n0 }),
            ListMarkerKind::Ordered { style: s1, n: n1 },
        ) => s0 == s1 && n1 == n0.saturating_add(1),
        _ => false,
    }
}

/// 行頭リストマーカーの判定
fn list_marker_kind(line: &TextLine) -> Option<ListMarkerKind> {
    if line.dir == "ttb" {
        return None;
    }
    let first = line.words.first()?;
    if line.words.len() < 2 {
        return None;
    }
    if is_bullet_marker_word(&first.text) {
        return Some(ListMarkerKind::Bullet);
    }
    if let Some((style, n)) = parse_ordered_marker_word(&first.text) {
        return Some(ListMarkerKind::Ordered { style, n });
    }
    None
}

fn is_bullet_marker_word(text: &str) -> bool {
    if text == "-" || text == "*" {
        return true;
    }
    let mut chars = text.chars();
    matches!((chars.next(), chars.next()), (Some(c), None) if is_bullet_glyph(c))
}

/// 番号マーカー単語の解析
fn parse_ordered_marker_word(text: &str) -> Option<(OrderedMarkerStyle, u32)> {
    let b = text.as_bytes();
    if b.len() < 2 {
        return None;
    }
    // (N)
    if b[0] == b'(' && b[b.len() - 1] == b')' && b.len() >= 3 {
        let digits = &b[1..b.len() - 1];
        let n = parse_marker_digits(digits)?;
        return Some((OrderedMarkerStyle::LParen, n));
    }
    // N.
    if b[b.len() - 1] == b'.' {
        let digits = &b[..b.len() - 1];
        let n = parse_marker_digits(digits)?;
        return Some((OrderedMarkerStyle::Dot, n));
    }
    // N)
    if b[b.len() - 1] == b')' {
        let digits = &b[..b.len() - 1];
        let n = parse_marker_digits(digits)?;
        return Some((OrderedMarkerStyle::Paren, n));
    }
    None
}

fn parse_marker_digits(digits: &[u8]) -> Option<u32> {
    if digits.is_empty() || digits.len() > 3 || !digits.iter().all(|c| c.is_ascii_digit()) {
        return None;
    }
    std::str::from_utf8(digits).ok()?.parse().ok()
}

fn is_list_marker_word(text: &str) -> bool {
    is_bullet_marker_word(text) || parse_ordered_marker_word(text).is_some()
}

/// 箇条記号か
fn is_bullet_glyph(c: char) -> bool {
    matches!(
        c,
        '\u{2022}' | '\u{25E6}' | '\u{25AA}' | '\u{25CF}' | '\u{25CB}' | '\u{25A0}' | '\u{25C6}'
    )
}

/// マーカー左端の字下げ一致
fn list_lefts_aligned(
    left_a: f64,
    left_b: f64,
    chars: &[TextChar],
    line_a: &TextLine,
    line_b: &TextLine,
) -> bool {
    let fs_a = line_rep_font_size(chars, line_a).unwrap_or(0.0);
    let fs_b = line_rep_font_size(chars, line_b).unwrap_or(0.0);
    let tol = list_indent_tol(fs_a.max(fs_b));
    (left_a - left_b).abs() <= tol
}

/// リスト字下げの許容幅
fn list_indent_tol(font_size: f64) -> f64 {
    let scaled = if font_size.is_finite() && font_size > 0.0 {
        font_size * LIST_INDENT_FACTOR
    } else {
        0.0
    };
    LIST_INDENT_MIN_PT.max(scaled)
}

/// ぶら下げ継続行か
fn is_hang_continuation(
    chars: &[TextChar],
    prev: &TextLine,
    next: &TextLine,
    marker_left: f64,
    marker_fs: Option<f64>,
) -> bool {
    if next.dir == "ttb" || list_marker_kind(next).is_some() {
        return false;
    }
    let Some(mfs) = marker_fs else {
        return false;
    };
    let Some(nfs) = line_rep_font_size(chars, next) else {
        return false;
    };
    if !(mfs.is_finite() && mfs > 0.0 && nfs.is_finite() && nfs > 0.0) {
        return false;
    }
    let hang = list_indent_tol(mfs);
    if next.left + f64::EPSILON < marker_left + hang {
        return false;
    }
    let gap = (line_rep_baseline_from_chars(chars, next)
        - line_rep_baseline_from_chars(chars, prev))
    .abs();
    gap <= mfs.max(nfs) * PARA_LEADING_FACTOR
}

/// 項目行群から List ブロックを組み立てる
fn make_list_block(items: Vec<Vec<TextLine>>, ordered: bool) -> TextBlock {
    let mut all_lines: Vec<TextLine> = Vec::new();
    let mut item_texts: Vec<String> = Vec::new();
    for item in items {
        let body_lines = list_item_body_lines(&item);
        let body = join_paragraph_text(&body_lines);
        if !body.trim().is_empty() {
            item_texts.push(body);
        }
        all_lines.extend(item);
    }
    let dir = all_lines
        .first()
        .map(|l| l.dir.clone())
        .unwrap_or_else(|| "ltr".into());
    let rot = all_lines.first().map(|l| l.rot).unwrap_or(0);
    let mut left = f64::INFINITY;
    let mut right = f64::NEG_INFINITY;
    let mut top = f64::INFINITY;
    let mut bottom = f64::NEG_INFINITY;
    for line in &all_lines {
        left = left.min(line.left);
        right = right.max(line.right);
        top = top.min(line.top);
        bottom = bottom.max(line.bottom);
    }
    TextBlock {
        kind: TextBlockKind::List { ordered },
        role: TextBlockRole::Body,
        text: item_texts.join("\n"),
        left,
        right,
        top,
        bottom,
        dir,
        rot,
        lines: all_lines,
    }
}

/// マーカーを除いた項目本文行
fn list_item_body_lines(item: &[TextLine]) -> Vec<TextLine> {
    if item.is_empty() {
        return Vec::new();
    }
    let mut out = Vec::with_capacity(item.len());
    let mut first = item[0].clone();
    if first
        .words
        .first()
        .is_some_and(|w| is_list_marker_word(&w.text))
    {
        first.words.remove(0);
        rebuild_line_from_words(&mut first);
    }
    out.push(first);
    out.extend(item.iter().skip(1).cloned());
    out
}

/// 単語列に合わせた行の chars と bbox
fn rebuild_line_from_words(line: &mut TextLine) {
    line.chars = line
        .words
        .iter()
        .flat_map(|w| w.chars.iter().copied())
        .collect();
    if line.words.is_empty() {
        line.right = line.left;
        return;
    }
    line.left = line
        .words
        .iter()
        .map(|w| w.left)
        .fold(f64::INFINITY, f64::min);
    line.right = line
        .words
        .iter()
        .map(|w| w.right)
        .fold(f64::NEG_INFINITY, f64::max);
    line.top = line
        .words
        .iter()
        .map(|w| w.top)
        .fold(f64::INFINITY, f64::min);
    line.bottom = line
        .words
        .iter()
        .map(|w| w.bottom)
        .fold(f64::NEG_INFINITY, f64::max);
}

/// chars 参照での行代表ベースライン
fn line_rep_baseline_from_chars(chars: &[TextChar], line: &TextLine) -> f64 {
    let vertical = line.dir == "ttb";
    let mut vals = Vec::new();
    for &idx in &line.chars {
        let Some(ch) = chars.get(idx as usize) else {
            continue;
        };
        if is_whitespace_str(&ch.text) {
            continue;
        }
        let (px, py) = derotate_xy(ch.transform[4], ch.transform[5], line.rot);
        let v = if vertical { px } else { py };
        if v.is_finite() {
            vals.push(v);
        }
    }
    median_f64(&mut vals).unwrap_or(line.top)
}

/// 行のストリーム順キー
fn line_stream_index(line: &TextLine) -> u32 {
    line.chars.iter().copied().min().unwrap_or(u32::MAX)
}

/// 行の代表ベースライン
fn line_rep_baseline(page: &TextPage, line: &TextLine) -> f64 {
    let vertical = line.dir == "ttb";
    let mut vals = Vec::new();
    for &idx in &line.chars {
        let ch = &page.chars[idx as usize];
        if is_whitespace_str(&ch.text) {
            continue;
        }
        let (px, py) = derotate_xy(ch.transform[4], ch.transform[5], line.rot);
        let v = if vertical { px } else { py };
        if v.is_finite() {
            vals.push(v);
        }
    }
    median_f64(&mut vals).unwrap_or(0.0)
}

/// 行の代表 font_size
fn line_rep_font_size(chars: &[TextChar], line: &TextLine) -> Option<f64> {
    let mut vals = Vec::new();
    for &idx in &line.chars {
        let ch = &chars[idx as usize];
        if is_whitespace_str(&ch.text) {
            continue;
        }
        if ch.font_size.is_finite() && ch.font_size > 0.0 {
            vals.push(ch.font_size);
        }
    }
    median_f64(&mut vals)
}

/// 行の進行軸区間
fn line_progress_interval(page: &TextPage, line: &TextLine) -> (f64, f64) {
    let vertical = line.dir == "ttb";
    let mut min_p = f64::INFINITY;
    let mut max_p = f64::NEG_INFINITY;
    let mut any = false;
    for &idx in &line.chars {
        let ch = &page.chars[idx as usize];
        if is_whitespace_str(&ch.text) {
            continue;
        }
        any = true;
        for &(x, y) in &[
            (ch.left, ch.top),
            (ch.right, ch.top),
            (ch.left, ch.bottom),
            (ch.right, ch.bottom),
        ] {
            let (px, py) = derotate_xy(x, y, line.rot);
            let p = if vertical { py } else { px };
            min_p = min_p.min(p);
            max_p = max_p.max(p);
        }
    }
    if any { (min_p, max_p) } else { (0.0, 0.0) }
}

/// 進行軸区間の共有長が正か
fn intervals_overlap(a: (f64, f64), b: (f64, f64)) -> bool {
    let lo = a.0.max(b.0);
    let hi = a.1.min(b.1);
    hi > lo
}

/// 有限値の中央値
fn median_f64(values: &mut [f64]) -> Option<f64> {
    let n = values.len();
    if n == 0 {
        return None;
    }
    let cmp = |a: &f64, b: &f64| a.total_cmp(b);
    if n % 2 == 1 {
        let mid = n / 2;
        values.select_nth_unstable_by(mid, cmp);
        Some(values[mid])
    } else {
        let hi = n / 2;
        values.select_nth_unstable_by(hi, cmp);
        let upper = values[hi];
        let lower = values[..hi]
            .iter()
            .copied()
            .fold(f64::NEG_INFINITY, f64::max);
        Some((lower + upper) / 2.0)
    }
}

/// ラテン文字か
fn is_latin_letter(c: char) -> bool {
    matches!(c,
        'A'..='Z'
        | 'a'..='z'
        | '\u{00C0}'..='\u{00D6}'
        | '\u{00D8}'..='\u{00F6}'
        | '\u{00F8}'..='\u{00FF}'
        | '\u{0100}'..='\u{017F}'
        | '\u{0180}'..='\u{024F}'
        | '\u{1E00}'..='\u{1EFF}'
    )
}

/// CJK 文字種か
fn is_cjk(c: char) -> bool {
    matches!(c,
        // Hangul Jamo
        '\u{1100}'..='\u{11FF}'
        // CJK Radicals Supplement
        | '\u{2E80}'..='\u{2EFF}'
        // Kangxi Radicals
        | '\u{2F00}'..='\u{2FDF}'
        // Ideographic Description Characters
        | '\u{2FF0}'..='\u{2FFF}'
        // CJK Symbols and Punctuation
        | '\u{3000}'..='\u{303F}'
        // Hiragana
        | '\u{3040}'..='\u{309F}'
        // Katakana
        | '\u{30A0}'..='\u{30FF}'
        // Bopomofo
        | '\u{3100}'..='\u{312F}'
        // Hangul Compatibility Jamo
        | '\u{3130}'..='\u{318F}'
        // Kanbun / Bopomofo Extended
        | '\u{3190}'..='\u{31EF}'
        // Katakana Phonetic Extensions
        | '\u{31F0}'..='\u{31FF}'
        // Enclosed CJK Letters and Months
        | '\u{3200}'..='\u{32FF}'
        // CJK Compatibility
        | '\u{3300}'..='\u{33FF}'
        // CJK Unified Ideographs Extension A
        | '\u{3400}'..='\u{4DBF}'
        // CJK Unified Ideographs
        | '\u{4E00}'..='\u{9FFF}'
        // Hangul Syllables
        | '\u{AC00}'..='\u{D7AF}'
        // CJK Compatibility Ideographs
        | '\u{F900}'..='\u{FAFF}'
        // Vertical Forms
        | '\u{FE10}'..='\u{FE1F}'
        // CJK Compatibility Forms
        | '\u{FE30}'..='\u{FE4F}'
        // Halfwidth and Fullwidth Forms
        | '\u{FF00}'..='\u{FFEF}'
        // CJK Unified Ideographs Extension B〜 / Compatibility Supplement
        | '\u{20000}'..='\u{2FA1F}'
        // CJK Unified Ideographs Extension G〜H
        | '\u{30000}'..='\u{323AF}'
    )
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::model::Cell;

    fn font(vertical: bool) -> TextFont {
        TextFont {
            name: "F".into(),
            ascent: 0.8,
            descent: -0.2,
            vertical,
            bold: false,
            italic: false,
        }
    }

    fn ch(text: &str, x: f64, y: f64, adv_x: f64, adv_y: f64, font_size: f64) -> TextChar {
        TextChar {
            text: text.into(),
            left: x,
            right: x + adv_x.abs().max(1.0),
            top: y,
            bottom: y + font_size,
            transform: [font_size, 0.0, 0.0, -font_size, x, y],
            advance: [adv_x, adv_y],
            glyph_width: None,
            font: 0,
            font_size,
            rot: 0,
            upright: true,
            synthetic: false,
        }
    }

    fn ch_at(
        text: &str,
        x: f64,
        y: f64,
        adv_x: f64,
        adv_y: f64,
        font_size: f64,
        font_idx: u32,
        vertical: bool,
    ) -> TextChar {
        TextChar {
            text: text.into(),
            left: x,
            right: x + if vertical {
                font_size
            } else {
                adv_x.abs().max(1.0)
            },
            top: y,
            bottom: y + if vertical {
                adv_y.abs().max(font_size)
            } else {
                font_size
            },
            transform: [font_size, 0.0, 0.0, -font_size, x, y],
            advance: [adv_x, adv_y],
            glyph_width: None,
            font: font_idx,
            font_size,
            rot: 0,
            upright: !vertical,
            synthetic: false,
        }
    }

    fn ch_rot(text: &str, x: f64, y: f64, advance: f64, font_size: f64, rot: i32) -> TextChar {
        let (transform, glyph_advance, left, right, top, bottom) = match rot {
            90 => (
                [0.0, -font_size, -font_size, 0.0, x, y],
                [0.0, -advance],
                x - font_size,
                x,
                y - advance,
                y,
            ),
            180 => (
                [-font_size, 0.0, 0.0, font_size, x, y],
                [-advance, 0.0],
                x - advance,
                x,
                y - font_size,
                y,
            ),
            270 => (
                [0.0, font_size, font_size, 0.0, x, y],
                [0.0, advance],
                x,
                x + font_size,
                y,
                y + advance,
            ),
            _ => (
                [font_size, 0.0, 0.0, -font_size, x, y],
                [advance, 0.0],
                x,
                x + advance,
                y,
                y + font_size,
            ),
        };
        TextChar {
            text: text.into(),
            left,
            right,
            top,
            bottom,
            transform,
            advance: glyph_advance,
            glyph_width: None,
            font: 0,
            font_size,
            rot,
            upright: rot == 0,
            synthetic: false,
        }
    }

    fn page(chars: Vec<TextChar>) -> TextPage {
        TextPage {
            width: 600.0,
            height: 800.0,
            fonts: vec![font(false)],
            chars,
        }
    }

    fn cell(text: &str, left: f64, top: f64, right: f64, bottom: f64) -> Cell {
        Cell {
            text: text.into(),
            bbox: BBox {
                x0: left,
                top,
                x1: right,
                bottom,
            },
        }
    }

    fn table_one(cells: Vec<Vec<Cell>>, left: f64, top: f64, right: f64, bottom: f64) -> Table {
        Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: left,
                top,
                x1: right,
                bottom,
            },
            n_rows: cells.len(),
            n_cols: cells.first().map(|r| r.len()).unwrap_or(0),
            data: cells,
        }
    }

    fn text_blocks(blocks: &[DocBlock]) -> Vec<&TextBlock> {
        blocks
            .iter()
            .filter_map(|b| match b {
                DocBlock::Text(t) => Some(t),
                _ => None,
            })
            .collect()
    }

    fn word_line(text: &str, x: f64, y: f64, fs: f64) -> Vec<TextChar> {
        let mut chars = Vec::new();
        let mut cx = x;
        let adv = fs * 0.5;
        for c in text.chars() {
            let s = c.to_string();
            chars.push(ch(&s, cx, y, adv, 0.0, fs));
            cx += adv;
        }
        chars
    }

    #[test]
    fn paragraph_merges_close_lines() {
        let fs = 10.0;
        let adv = 5.0;
        // 行送り 15 ≤ 1.8*10 → 併合
        let p = page(vec![
            ch("A", 0.0, 100.0, adv, 0.0, fs),
            ch("B", adv, 100.0, adv, 0.0, fs),
            ch("C", 0.0, 115.0, adv, 0.0, fs),
            ch("D", adv, 115.0, adv, 0.0, fs),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "AB CD");
        assert_eq!(tb[0].lines.len(), 2);
        assert_eq!(tb[0].kind, TextBlockKind::Paragraph);
    }

    #[test]
    fn paragraph_splits_on_large_leading() {
        let fs = 10.0;
        let adv = 5.0;
        // 行送り 20 > 1.8*10 → 分割
        let p = page(vec![
            ch("A", 0.0, 100.0, adv, 0.0, fs),
            ch("B", 0.0, 120.0, adv, 0.0, fs),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].text, "A");
        assert_eq!(tb[1].text, "B");
    }

    #[test]
    fn paragraph_splits_on_font_size_ratio() {
        let adv = 5.0;
        // 10 と 20 で比 2.0 > 1.33
        let p = page(vec![
            ch("A", 0.0, 100.0, adv, 0.0, 10.0),
            ch("B", 0.0, 112.0, adv, 0.0, 20.0),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
    }

    #[test]
    fn paragraph_splits_on_progress_non_overlap() {
        let fs = 10.0;
        let adv = 5.0;
        // 進行軸区間が重ならない
        let p = page(vec![
            ch("A", 0.0, 100.0, adv, 0.0, fs),
            ch("B", 100.0, 110.0, adv, 0.0, fs),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
    }

    #[test]
    fn join_latin_inserts_space() {
        let fs = 10.0;
        let mut chars = word_line("hello", 0.0, 100.0, fs);
        chars.extend(word_line("world", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "hello world");
    }

    #[test]
    fn join_cjk_no_space() {
        let fs = 10.0;
        let mut chars = word_line("日本", 0.0, 100.0, fs);
        chars.extend(word_line("語文", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "日本語文");
    }

    #[test]
    fn join_cjk_ext_b_no_space() {
        let fs = 10.0;
        let mut chars = word_line("株式", 0.0, 100.0, fs);
        chars.extend(word_line("\u{20BB7}野", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "株式\u{20BB7}野");
    }

    #[test]
    fn join_hyphen_removed_when_latin_lowercase() {
        let fs = 10.0;
        let mut chars = word_line("hyphen-", 0.0, 100.0, fs);
        chars.extend(word_line("ation", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "hyphenation");
    }

    #[test]
    fn join_hyphen_kept_no_space_when_not_lowercase() {
        let fs = 10.0;
        let mut chars = word_line("FOO-", 0.0, 100.0, fs);
        chars.extend(word_line("BAR", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "FOO-BAR");
    }

    #[test]
    fn join_soft_hyphen_always_removed() {
        let fs = 10.0;
        let mut chars = word_line("soft\u{00AD}", 0.0, 100.0, fs);
        chars.extend(word_line("ware", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "software");
    }

    #[test]
    fn join_hyphen_digit_keeps_hyphen_no_space() {
        let fs = 10.0;
        let mut chars = word_line("end-", 0.0, 100.0, fs);
        chars.extend(word_line("123", 0.0, 115.0, fs));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "end-123");
    }

    #[test]
    fn table_excludes_fully_owned_line() {
        let fs = 10.0;
        let adv = 5.0;
        // 表セル内の文字と外の文字
        let p = page(vec![
            ch("T", 10.0, 10.0, adv, 0.0, fs),
            ch("A", 15.0, 10.0, adv, 0.0, fs),
            ch("X", 0.0, 100.0, adv, 0.0, fs),
        ]);
        let t = table_one(
            vec![vec![cell("TA", 5.0, 5.0, 40.0, 30.0)]],
            5.0,
            5.0,
            40.0,
            30.0,
        );
        let blocks = build_blocks(&p, &[t]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "X");
        assert!(matches!(blocks[0], DocBlock::Table(_)) || matches!(blocks[1], DocBlock::Table(_)));
    }

    #[test]
    fn table_partial_line_rebuilt() {
        let fs = 10.0;
        let adv = 5.0;
        // 同一行: 表内 A と表外 B（x を離して同一ベースライン）
        let p = page(vec![
            ch("A", 10.0, 100.0, adv, 0.0, fs),
            ch("B", 80.0, 100.0, adv, 0.0, fs),
        ]);
        let t = table_one(
            vec![vec![cell("A", 5.0, 95.0, 30.0, 120.0)]],
            5.0,
            95.0,
            30.0,
            120.0,
        );
        let blocks = build_blocks(&p, &[t]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "B");
        assert_eq!(tb[0].lines[0].chars, vec![1]);
        assert_eq!(tb[0].lines[0].words[0].text, "B");
    }

    #[test]
    fn table_bbox_non_cell_glyph_remains() {
        let fs = 10.0;
        let adv = 5.0;
        // 表 bbox 内だがセル外（キャプション想定）
        let p = page(vec![
            ch("C", 10.0, 50.0, adv, 0.0, fs),
            ch("T", 10.0, 100.0, adv, 0.0, fs),
        ]);
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 40.0,
                x1: 100.0,
                bottom: 130.0,
            },
            n_rows: 1,
            n_cols: 1,
            data: vec![vec![cell("T", 5.0, 95.0, 40.0, 120.0)]],
        };
        let blocks = build_blocks(&p, &[t]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "C");
    }

    #[test]
    fn invalid_cells_do_not_own_glyphs() {
        let fs = 10.0;
        let adv = 5.0;
        let p = page(vec![ch("A", 10.0, 10.0, adv, 0.0, fs)]);
        // 空 text・ゼロ面積は無効
        let t = table_one(
            vec![vec![
                cell("", 5.0, 5.0, 40.0, 30.0),
                Cell {
                    text: "Z".into(),
                    bbox: BBox {
                        x0: 5.0,
                        top: 5.0,
                        x1: 5.0,
                        bottom: 30.0,
                    },
                },
            ]],
            5.0,
            5.0,
            40.0,
            30.0,
        );
        let blocks = build_blocks(&p, &[t]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "A");
    }

    #[test]
    fn reading_order_interleaves_table_and_paragraph() {
        let fs = 10.0;
        let adv = 5.0;
        let p = page(vec![
            ch("T", 0.0, 10.0, adv, 0.0, fs),  // top para
            ch("B", 0.0, 200.0, adv, 0.0, fs), // bottom para
        ]);
        let t = table_one(
            vec![vec![cell("X", 50.0, 80.0, 90.0, 120.0)]],
            50.0,
            80.0,
            90.0,
            120.0,
        );
        let blocks = build_blocks(&p, &[t]);
        assert_eq!(blocks.len(), 3);
        match &blocks[0] {
            DocBlock::Text(tb) => assert_eq!(tb.text, "T"),
            _ => panic!("expected top text"),
        }
        match &blocks[1] {
            DocBlock::Table(tb) => assert!((tb.bbox.top - 80.0).abs() < 1e-9),
            _ => panic!("expected table"),
        }
        match &blocks[2] {
            DocBlock::Text(tb) => assert_eq!(tb.text, "B"),
            _ => panic!("expected bottom text"),
        }
    }

    #[test]
    fn reading_order_tie_break_by_generation() {
        let fs = 10.0;
        let adv = 5.0;
        // 本文と表が完全に同座標 (top,left)
        let p = page(vec![ch("A", 10.0, 10.0, adv, 0.0, fs)]);
        let t = table_one(
            vec![vec![cell("Z", 100.0, 100.0, 140.0, 130.0)]],
            10.0,
            10.0,
            50.0,
            40.0,
        );
        // 本文 bbox が top=10,left=10、表 bbox も top=10,left=10
        // 表の生成番号 0 < 本文 1 → 表が先
        let blocks = build_blocks(&p, &[t]);
        assert_eq!(blocks.len(), 2);
        assert!(matches!(blocks[0], DocBlock::Table(_)));
        assert!(matches!(blocks[1], DocBlock::Text(_)));
    }

    #[test]
    fn empty_page_yields_no_blocks() {
        let p = page(vec![]);
        let blocks = build_blocks(&p, &[]);
        assert!(blocks.is_empty());
    }

    #[test]
    fn tables_only_page() {
        let p = page(vec![]);
        let t = table_one(
            vec![vec![cell("X", 0.0, 0.0, 10.0, 10.0)]],
            0.0,
            0.0,
            10.0,
            10.0,
        );
        let blocks = build_blocks(&p, &[t]);
        assert_eq!(blocks.len(), 1);
        assert!(matches!(blocks[0], DocBlock::Table(_)));
    }

    #[test]
    fn all_lines_table_owned() {
        let fs = 10.0;
        let adv = 5.0;
        let p = page(vec![
            ch("A", 10.0, 10.0, adv, 0.0, fs),
            ch("B", 15.0, 10.0, adv, 0.0, fs),
        ]);
        let t = table_one(
            vec![vec![cell("AB", 5.0, 5.0, 40.0, 30.0)]],
            5.0,
            5.0,
            40.0,
            30.0,
        );
        let blocks = build_blocks(&p, &[t]);
        assert_eq!(blocks.len(), 1);
        assert!(matches!(blocks[0], DocBlock::Table(_)));
        assert!(text_blocks(&blocks).is_empty());
    }

    #[test]
    fn rotated_group_builds_paragraph() {
        let fs = 10.0;
        let adv = 5.0;
        let p = page(vec![
            ch_rot("A", 100.0, 60.0, adv, fs, 90),
            ch_rot("B", 100.0, 60.0 - adv, adv, fs, 90),
            ch_rot("C", 100.0, 60.0 - adv * 2.0, adv, fs, 90),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].rot, 90);
        assert_eq!(tb[0].dir, "ltr");
        assert_eq!(tb[0].text, "ABC");
    }

    #[test]
    fn mixed_vertical_and_horizontal() {
        let fs = 10.0;
        let adv = 5.0;
        let p = TextPage {
            width: 600.0,
            height: 800.0,
            fonts: vec![font(false), font(true)],
            chars: vec![
                {
                    let mut c = ch("H", 0.0, 100.0, adv, 0.0, fs);
                    c.font = 0;
                    c
                },
                {
                    let mut c = ch("i", adv, 100.0, adv, 0.0, fs);
                    c.font = 0;
                    c
                },
                ch_at("あ", 200.0, 50.0, 0.0, 10.0, fs, 1, true),
                ch_at("い", 200.0, 60.0, 0.0, 10.0, fs, 1, true),
            ],
        };
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
        // 表示座標 top で読む: 縦書き top=50 が先
        assert_eq!(tb[0].dir, "ttb");
        assert_eq!(tb[0].text, "あい");
        assert_eq!(tb[1].dir, "ltr");
        assert_eq!(tb[1].text, "Hi");
    }

    #[test]
    fn json_kind_and_type_fields() {
        let fs = 10.0;
        let p = page(vec![ch("A", 0.0, 100.0, 5.0, 0.0, fs)]);
        let blocks = build_blocks(&p, &[]);
        let json = serde_json::to_string(&blocks[0]).unwrap();
        assert!(json.contains(r#""type":"text""#));
        assert!(json.contains(r#""kind":"paragraph""#));
        assert!(!json.contains(r#""level""#));
    }

    #[test]
    fn json_heading_shape_for_type() {
        let tb = TextBlock {
            kind: TextBlockKind::Heading { level: 2 },
            role: TextBlockRole::Body,
            text: "Title".into(),
            left: 0.0,
            right: 10.0,
            top: 0.0,
            bottom: 10.0,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![],
        };
        let json = serde_json::to_string(&DocBlock::Text(tb)).unwrap();
        assert!(json.contains(r#""type":"text""#));
        assert!(json.contains(r#""kind":"heading""#));
        assert!(json.contains(r#""level":2"#));
    }

    #[test]
    fn json_list_shape_for_type() {
        let tb = TextBlock {
            kind: TextBlockKind::List { ordered: false },
            role: TextBlockRole::Body,
            text: "a\nb".into(),
            left: 0.0,
            right: 10.0,
            top: 0.0,
            bottom: 10.0,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![],
        };
        let json = serde_json::to_string(&DocBlock::Text(tb)).unwrap();
        assert!(json.contains(r#""kind":"list""#));
        assert!(json.contains(r#""ordered":false"#));
    }

    /// リスト検出テスト用の行組み立て
    fn push_list_line(
        chars: &mut Vec<TextChar>,
        words: &[(&str, f64)],
        top: f64,
        fs: f64,
    ) -> TextLine {
        let bottom = top + fs;
        let mut line_words = Vec::new();
        let mut line_chars = Vec::new();
        for &(text, left) in words {
            let mut w_chars = Vec::new();
            let mut x = left;
            let adv = fs * 0.5;
            for c in text.chars() {
                let s = c.to_string();
                let idx = chars.len() as u32;
                chars.push(TextChar {
                    text: s,
                    left: x,
                    right: x + adv,
                    top,
                    bottom,
                    transform: [fs, 0.0, 0.0, -fs, x, top],
                    advance: [adv, 0.0],
                    glyph_width: None,
                    font: 0,
                    font_size: fs,
                    rot: 0,
                    upright: true,
                    synthetic: false,
                });
                w_chars.push(idx);
                line_chars.push(idx);
                x += adv;
            }
            let right = if w_chars.is_empty() {
                left
            } else {
                chars[*w_chars.last().unwrap() as usize].right
            };
            line_words.push(TextWord {
                text: text.into(),
                left,
                right,
                top,
                bottom,
                chars: w_chars,
            });
        }
        let left = line_words
            .iter()
            .map(|w| w.left)
            .fold(f64::INFINITY, f64::min);
        let right = line_words
            .iter()
            .map(|w| w.right)
            .fold(f64::NEG_INFINITY, f64::max);
        TextLine {
            left,
            right,
            top,
            bottom,
            dir: "ltr".into(),
            rot: 0,
            words: line_words,
            chars: line_chars,
        }
    }

    fn para_from_lines(lines: Vec<TextLine>) -> DocBlock {
        DocBlock::Text(make_text_block(lines))
    }

    fn doc_from_para_lines(chars: Vec<TextChar>, lines: Vec<TextLine>) -> DocDoc {
        DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 600.0,
                height: 800.0,
                fonts: vec![],
                chars,
                blocks: vec![para_from_lines(lines)],
            }],
            warnings: Vec::new(),
        }
    }

    #[test]
    fn list_two_bullet_items_become_list() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(
                &mut chars,
                &[("\u{2022}", 50.0), ("Alpha", 60.0)],
                100.0,
                fs,
            ),
            push_list_line(&mut chars, &[("\u{2022}", 50.0), ("Beta", 60.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: false });
        assert_eq!(tb[0].text, "Alpha\nBeta");
        assert_eq!(document_to_markdown(&doc, true), "- Alpha\n- Beta");
    }

    #[test]
    fn list_single_bullet_stays_paragraph() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![push_list_line(
            &mut chars,
            &[("\u{2022}", 50.0), ("Only", 60.0)],
            100.0,
            fs,
        )];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].kind, TextBlockKind::Paragraph);
        assert!(tb[0].text.contains("Only"));
        assert_eq!(document_to_markdown(&doc, true), "• Only");
    }

    #[test]
    fn list_hanging_continuation_hard_break() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(
                &mut chars,
                &[("\u{2022}", 50.0), ("First", 60.0)],
                100.0,
                fs,
            ),
            push_list_line(&mut chars, &[("line", 58.0)], 112.0, fs),
            push_list_line(
                &mut chars,
                &[("\u{2022}", 50.0), ("Second", 60.0)],
                124.0,
                fs,
            ),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: false });
        assert_eq!(tb[0].text, "First line\nSecond");
        assert_eq!(
            document_to_markdown(&doc, true),
            "- First  \nline\n- Second"
        );
    }

    #[test]
    fn list_different_indent_not_merged() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("\u{2022}", 50.0), ("A", 60.0)], 100.0, fs),
            push_list_line(&mut chars, &[("\u{2022}", 80.0), ("B", 90.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_ordered_number_detected() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1.", 50.0), ("One", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("2.", 50.0), ("Two", 70.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: true });
        assert_eq!(tb[0].text, "One\nTwo");
        assert_eq!(document_to_markdown(&doc, true), "1. One\n2. Two");
    }

    #[test]
    fn list_ordered_section_number_not_marker() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1.1", 50.0), ("Sec", 80.0)], 100.0, fs),
            push_list_line(&mut chars, &[("1.2", 50.0), ("Sub", 80.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_ordered_non_consecutive_not_list() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1.", 50.0), ("A", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("3.", 50.0), ("C", 70.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_ordered_repeat_then_consecutive() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1.", 50.0), ("A", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("1.", 50.0), ("B", 70.0)], 115.0, fs),
            push_list_line(&mut chars, &[("2.", 50.0), ("C", 70.0)], 130.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(
            tb.iter()
                .any(|t| t.kind == TextBlockKind::List { ordered: true })
        );
        let list = tb
            .iter()
            .find(|t| t.kind == TextBlockKind::List { ordered: true })
            .unwrap();
        assert_eq!(list.text, "B\nC");
    }

    #[test]
    fn list_paren_number_detected() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1)", 50.0), ("One", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("2)", 50.0), ("Two", 70.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: true });
        assert_eq!(tb[0].text, "One\nTwo");
        assert_eq!(document_to_markdown(&doc, true), "1. One\n2. Two");
    }

    #[test]
    fn list_lparen_number_detected() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("(1)", 50.0), ("One", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("(2)", 50.0), ("Two", 70.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: true });
        assert_eq!(document_to_markdown(&doc, true), "1. One\n2. Two");
    }

    #[test]
    fn list_ordered_mixed_style_not_list() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("1.", 50.0), ("One", 70.0)], 100.0, fs),
            push_list_line(&mut chars, &[("(2)", 50.0), ("Two", 70.0)], 115.0, fs),
            push_list_line(&mut chars, &[("2)", 50.0), ("Three", 70.0)], 130.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_ascii_dash_two_items() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("-", 40.0), ("red", 50.0)], 100.0, fs),
            push_list_line(&mut chars, &[("-", 40.0), ("blue", 50.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb[0].kind, TextBlockKind::List { ordered: false });
        assert_eq!(document_to_markdown(&doc, true), "- red\n- blue");
    }

    #[test]
    fn list_item_body_escape_leading_hash() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("\u{2022}", 50.0), ("#tag", 60.0)], 100.0, fs),
            push_list_line(&mut chars, &[("\u{2022}", 50.0), ("ok", 60.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        assert_eq!(document_to_markdown(&doc, true), "- \\#tag\n- ok");
    }

    #[test]
    fn list_star_footnote_runs_not_list_when_glued() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(&mut chars, &[("*****", 50.0), ("Note", 80.0)], 100.0, fs),
            push_list_line(&mut chars, &[("*****", 50.0), ("More", 80.0)], 115.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_before_heading_prevents_list_as_heading() {
        let fs = 10.0;
        let mut chars = Vec::new();
        let lines = vec![
            push_list_line(
                &mut chars,
                &[("\u{2022}", 50.0), ("BigA", 60.0)],
                40.0,
                20.0,
            ),
            push_list_line(
                &mut chars,
                &[("\u{2022}", 50.0), ("BigB", 60.0)],
                65.0,
                20.0,
            ),
            push_list_line(&mut chars, &[("body", 50.0)], 200.0, fs),
            push_list_line(&mut chars, &[("text", 50.0)], 215.0, fs),
            push_list_line(&mut chars, &[("here", 50.0)], 230.0, fs),
            push_list_line(&mut chars, &[("more", 50.0)], 245.0, fs),
            push_list_line(&mut chars, &[("lines", 50.0)], 260.0, fs),
        ];
        let mut doc = doc_from_para_lines(chars, lines);
        assign_lists(&mut doc);
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let list = kinds.iter().find(|(t, _)| t.contains("BigA")).unwrap();
        assert_eq!(list.1, TextBlockKind::List { ordered: false });
    }

    /// マーカー無しブロックだけの Doc を組み立てる
    fn doc_from_blocks(chars: Vec<TextChar>, blocks: Vec<DocBlock>) -> DocDoc {
        DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 600.0,
                height: 800.0,
                fonts: vec![],
                chars,
                blocks,
            }],
            warnings: Vec::new(),
        }
    }

    #[test]
    fn assign_lists_preserves_non_marker_input_verbatim() {
        // リストが 1 つも無い入力で assign_lists 前後の Doc JSON が完全一致することを確認する
        let fs = 10.0;
        let mut chars = Vec::new();
        let l1 = push_list_line(&mut chars, &[("hello", 50.0)], 100.0, fs);
        let l2 = push_list_line(&mut chars, &[("world", 50.0)], 115.0, fs);
        let l3 = push_list_line(&mut chars, &[("goodbye", 50.0)], 200.0, fs);
        let blocks = vec![
            para_from_lines(vec![l1, l2]),
            para_from_lines(vec![l3]),
        ];
        let mut doc = doc_from_blocks(chars, blocks);
        let before = serde_json::to_string(&doc).unwrap();
        assign_lists(&mut doc);
        let after = serde_json::to_string(&doc).unwrap();
        assert_eq!(before, after);
    }

    #[test]
    fn assign_lists_keeps_two_independent_paragraphs() {
        // マーカーが 1 つだけ含まれても List 不成立なら元の段落境界を保つ
        let fs = 10.0;
        let mut chars = Vec::new();
        let l1 = push_list_line(&mut chars, &[("first", 50.0)], 100.0, fs);
        let l2 = push_list_line(&mut chars, &[("para", 50.0)], 115.0, fs);
        let l3 = push_list_line(&mut chars, &[("second", 50.0)], 200.0, fs);
        let l4 = push_list_line(&mut chars, &[("para", 50.0)], 215.0, fs);
        let blocks = vec![
            para_from_lines(vec![l1, l2]),
            para_from_lines(vec![l3, l4]),
        ];
        let mut doc = doc_from_blocks(chars, blocks);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].text, "first para");
        assert_eq!(tb[1].text, "second para");
    }

    #[test]
    fn heading_size_paragraph_survives_assign_lists() {
        // タイトルサイズと本文サイズの独立ブロックを並べたページで、
        // assign_lists がブロック境界を潰さず assign_headings がタイトルを Heading にする
        let title_fs = 18.0;
        let body_fs = 10.0;
        let mut chars = Vec::new();
        let title = push_list_line(&mut chars, &[("Title", 50.0)], 40.0, title_fs);
        let b1 = push_list_line(&mut chars, &[("body1", 50.0)], 100.0, body_fs);
        let b2 = push_list_line(&mut chars, &[("body2", 50.0)], 115.0, body_fs);
        let blocks = vec![
            para_from_lines(vec![title]),
            para_from_lines(vec![b1, b2]),
        ];
        let mut doc = doc_from_blocks(chars, blocks);
        assign_lists(&mut doc);
        assign_headings(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].kind, TextBlockKind::Heading { level: 1 });
        assert_eq!(tb[0].text, "Title");
        assert_eq!(tb[1].kind, TextBlockKind::Paragraph);
    }

    #[test]
    fn list_run_breaks_on_rot_mismatch() {
        // (dir, rot) が異なる隣接ブロックはランに含めない
        let fs = 10.0;
        let mut chars = Vec::new();
        let mut a = push_list_line(&mut chars, &[("\u{2022}", 50.0), ("A", 60.0)], 100.0, fs);
        let mut b = push_list_line(&mut chars, &[("\u{2022}", 50.0), ("B", 60.0)], 115.0, fs);
        a.rot = 0;
        b.rot = 90;
        let blocks = vec![
            para_from_lines(vec![a]),
            para_from_lines(vec![b]),
        ];
        let mut doc = doc_from_blocks(chars, blocks);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 2);
        assert!(tb.iter().all(|t| t.kind == TextBlockKind::Paragraph));
    }

    #[test]
    fn list_splits_block_middle_around_list_span() {
        // 1 ブロックの中央にリスト成立区間があるときブロックを前後に切る
        let fs = 10.0;
        let mut chars = Vec::new();
        let intro = push_list_line(&mut chars, &[("intro", 50.0)], 100.0, fs);
        let b1 = push_list_line(&mut chars, &[("\u{2022}", 50.0), ("A", 60.0)], 115.0, fs);
        let b2 = push_list_line(&mut chars, &[("\u{2022}", 50.0), ("B", 60.0)], 130.0, fs);
        let outro = push_list_line(&mut chars, &[("outro", 50.0)], 145.0, fs);
        let mut doc = doc_from_para_lines(chars, vec![intro, b1, b2, outro]);
        assign_lists(&mut doc);
        let tb = text_blocks(&doc.pages[0].blocks);
        assert_eq!(tb.len(), 3);
        assert_eq!(tb[0].kind, TextBlockKind::Paragraph);
        assert_eq!(tb[0].text, "intro");
        assert_eq!(tb[1].kind, TextBlockKind::List { ordered: false });
        assert_eq!(tb[1].text, "A\nB");
        assert_eq!(tb[2].kind, TextBlockKind::Paragraph);
        assert_eq!(tb[2].text, "outro");
    }

    /// 本文と候補見出しから DocDoc を組み立てる
    fn doc_from_body_and_titles(body_fs: f64, body_text: &str, titles: &[(f64, &str)]) -> DocDoc {
        let mut chars = Vec::new();
        // 本文を複数グリフで最頻値を確保
        let mut y = 200.0;
        for _ in 0..5 {
            chars.extend(word_line(body_text, 0.0, y, body_fs));
            y += body_fs * 2.5; // 行送りを大きくして段落分割
        }
        y = 20.0;
        for &(fs, text) in titles {
            chars.extend(word_line(text, 0.0, y, fs));
            y += fs * 3.0;
        }
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts,
                chars: p.chars,
                blocks,
            }],
            warnings: Vec::new(),
        }
    }

    fn text_kinds(doc: &DocDoc) -> Vec<(&str, TextBlockKind)> {
        doc.pages
            .iter()
            .flat_map(|p| p.blocks.iter())
            .filter_map(|b| match b {
                DocBlock::Text(t) => Some((t.text.as_str(), t.kind.clone())),
                _ => None,
            })
            .collect()
    }

    #[test]
    fn heading_level1_at_1_8x() {
        // 本文 10、見出し 18 → level 1
        let mut doc = doc_from_body_and_titles(10.0, "body", &[(18.0, "H1")]);
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let h1 = kinds.iter().find(|(t, _)| *t == "H1").unwrap();
        assert_eq!(h1.1, TextBlockKind::Heading { level: 1 });
    }

    #[test]
    fn heading_level2_at_1_4x() {
        // 本文 10、見出し 14 → level 2（1.4 以上 1.8 未満）
        let mut doc = doc_from_body_and_titles(10.0, "body", &[(14.0, "H2")]);
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let h2 = kinds.iter().find(|(t, _)| *t == "H2").unwrap();
        assert_eq!(h2.1, TextBlockKind::Heading { level: 2 });
    }

    #[test]
    fn heading_level3_at_1_2x() {
        // 本文 10、見出し 12 → level 3（1.2 以上 1.4 未満）
        let mut doc = doc_from_body_and_titles(10.0, "body", &[(12.0, "H3")]);
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let h3 = kinds.iter().find(|(t, _)| *t == "H3").unwrap();
        assert_eq!(h3.1, TextBlockKind::Heading { level: 3 });
    }

    #[test]
    fn heading_below_1_2x_stays_paragraph() {
        // 本文と同サイズは Paragraph のまま
        let mut doc = doc_from_body_and_titles(10.0, "body", &[(10.0, "same")]);
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let same = kinds.iter().find(|(t, _)| *t == "same").unwrap();
        assert_eq!(same.1, TextBlockKind::Paragraph);
        for (t, k) in &kinds {
            if *t == "body" {
                assert_eq!(*k, TextBlockKind::Paragraph);
            }
        }
    }

    #[test]
    fn heading_skips_blocks_with_3_plus_lines() {
        // 3 行以上の大サイズブロックは対象外
        let fs_body = 10.0;
        let fs_big = 20.0;
        let mut chars = Vec::new();
        let mut y = 200.0;
        for _ in 0..5 {
            chars.extend(word_line("body", 0.0, y, fs_body));
            y += fs_body * 2.5;
        }
        // 大サイズ 3 行（行送り 15 ≤ 1.8*20 で 1 ブロックに併合）
        chars.extend(word_line("AAA", 0.0, 20.0, fs_big));
        chars.extend(word_line("BBB", 0.0, 35.0, fs_big));
        chars.extend(word_line("CCC", 0.0, 50.0, fs_big));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let mut doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts,
                chars: p.chars,
                blocks,
            }], warnings: Vec::new(),
        };
        // 3 行ブロックがあること
        let multi = text_blocks(&doc.pages[0].blocks)
            .into_iter()
            .find(|t| t.lines.len() >= 3)
            .expect("3-line block");
        assert_eq!(multi.lines.len(), 3);
        assign_headings(&mut doc);
        let multi = text_blocks(&doc.pages[0].blocks)
            .into_iter()
            .find(|t| t.lines.len() >= 3)
            .unwrap();
        assert_eq!(multi.kind, TextBlockKind::Paragraph);
    }

    #[test]
    fn heading_mode_tie_picks_smaller() {
        // 10.0 と 12.0 が同数 → 本文代表は 10.0
        // 12.0 の単独ブロックは 1.2 倍ちょうど → level 3
        let mut chars = Vec::new();
        let mut y = 100.0;
        for _ in 0..3 {
            chars.extend(word_line("aaaa", 0.0, y, 10.0));
            y += 30.0;
        }
        for _ in 0..3 {
            chars.extend(word_line("bbbb", 0.0, y, 12.0));
            y += 30.0;
        }
        // 候補: 18 → 1.8*10 = level 1（代表が 12 だと 1.5 で level 2 になる）
        chars.extend(word_line("TITLE", 0.0, 20.0, 18.0));
        let p = page(chars);
        let blocks = build_blocks(&p, &[]);
        let mut doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts,
                chars: p.chars,
                blocks,
            }], warnings: Vec::new(),
        };
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let title = kinds.iter().find(|(t, _)| *t == "TITLE").unwrap();
        assert_eq!(
            title.1,
            TextBlockKind::Heading { level: 1 },
            "tie should pick smaller body fs (10), so 18 is level 1"
        );
    }

    #[test]
    fn heading_no_body_samples_is_noop() {
        // 本文ブロックゼロ（表のみ）では何もしない
        let t = table_one(
            vec![vec![cell("X", 0.0, 0.0, 10.0, 10.0)]],
            0.0,
            0.0,
            10.0,
            10.0,
        );
        let p = page(vec![]);
        let blocks = build_blocks(&p, &[t.clone()]);
        let mut doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts,
                chars: p.chars,
                blocks,
            }], warnings: Vec::new(),
        };
        // 手動で Heading 相当の Text を足さず、表のみ
        assert!(text_blocks(&doc.pages[0].blocks).is_empty());
        assign_headings(&mut doc);
        assert_eq!(doc.pages[0].blocks.len(), 1);
        assert!(matches!(doc.pages[0].blocks[0], DocBlock::Table(_)));
    }

    #[test]
    fn heading_ignores_table_glyphs_for_body_mode() {
        // 表内の大サイズは母集団に入らない
        let fs_body = 10.0;
        let fs_table = 30.0;
        let mut chars = word_line("body", 0.0, 200.0, fs_body);
        chars.extend(word_line("body", 0.0, 230.0, fs_body));
        chars.extend(word_line("body", 0.0, 260.0, fs_body));
        // 表セル内の大文字
        chars.extend(word_line("TAB", 10.0, 100.0, fs_table));
        // 見出し候補 14 → 本文 10 なら level 2
        chars.extend(word_line("Head", 0.0, 20.0, 14.0));
        let p = page(chars);
        let t = table_one(
            vec![vec![cell("TAB", 5.0, 95.0, 80.0, 140.0)]],
            5.0,
            95.0,
            80.0,
            140.0,
        );
        let blocks = build_blocks(&p, &[t]);
        let mut doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts,
                chars: p.chars,
                blocks,
            }], warnings: Vec::new(),
        };
        assign_headings(&mut doc);
        let kinds = text_kinds(&doc);
        let head = kinds.iter().find(|(t, _)| *t == "Head").unwrap();
        assert_eq!(
            head.1,
            TextBlockKind::Heading { level: 2 },
            "table large glyphs must not shift body mode"
        );
    }

    fn text_block(kind: TextBlockKind, text: &str) -> DocBlock {
        DocBlock::Text(TextBlock {
            kind,
            role: TextBlockRole::Body,
            text: text.into(),
            left: 0.0,
            right: 10.0,
            top: 0.0,
            bottom: 10.0,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![],
        })
    }

    fn doc_with_blocks(blocks: Vec<DocBlock>) -> DocDoc {
        DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 600.0,
                height: 800.0,
                fonts: vec![],
                chars: vec![],
                blocks,
            }],
            warnings: Vec::new(),
        }
    }

    #[test]
    fn markdown_heading_and_paragraph() {
        let doc = doc_with_blocks(vec![
            text_block(TextBlockKind::Heading { level: 1 }, "Title"),
            text_block(TextBlockKind::Heading { level: 2 }, "Section"),
            text_block(TextBlockKind::Heading { level: 3 }, "Sub"),
            text_block(TextBlockKind::Paragraph, "body text"),
        ]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "# Title\n\n## Section\n\n### Sub\n\nbody text"
        );
    }

    #[test]
    fn markdown_gfm_table_shape() {
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 100.0,
                bottom: 50.0,
            },
            n_rows: 3,
            n_cols: 2,
            data: vec![
                vec![
                    cell("H1", 0.0, 0.0, 10.0, 10.0),
                    cell("H2", 10.0, 0.0, 20.0, 10.0),
                ],
                vec![
                    cell("A", 0.0, 10.0, 10.0, 20.0),
                    cell("B", 10.0, 10.0, 20.0, 20.0),
                ],
                vec![
                    cell("C", 0.0, 20.0, 10.0, 30.0),
                    cell("D", 10.0, 20.0, 20.0, 30.0),
                ],
            ],
        };
        let doc = doc_with_blocks(vec![DocBlock::Table(t)]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "| H1 | H2 |\n| --- | --- |\n| A | B |\n| C | D |"
        );
    }

    #[test]
    fn markdown_table_single_row_header_only() {
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 50.0,
                bottom: 20.0,
            },
            n_rows: 1,
            n_cols: 2,
            data: vec![vec![
                cell("Only", 0.0, 0.0, 10.0, 10.0),
                cell("Header", 10.0, 0.0, 20.0, 10.0),
            ]],
        };
        let doc = doc_with_blocks(vec![DocBlock::Table(t)]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "| Only | Header |\n| --- | --- |"
        );
    }

    #[test]
    fn markdown_table_empty_cells_from_merge() {
        // 結合セル由来の空セル
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 50.0,
                bottom: 30.0,
            },
            n_rows: 2,
            n_cols: 2,
            data: vec![
                vec![
                    cell("H", 0.0, 0.0, 10.0, 10.0),
                    cell("", 10.0, 0.0, 20.0, 10.0),
                ],
                vec![
                    cell("", 0.0, 10.0, 10.0, 20.0),
                    cell("V", 10.0, 10.0, 20.0, 20.0),
                ],
            ],
        };
        let doc = doc_with_blocks(vec![DocBlock::Table(t)]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "| H |  |\n| --- | --- |\n|  | V |"
        );
    }

    #[test]
    fn markdown_table_pad_and_truncate_cells() {
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 50.0,
                bottom: 30.0,
            },
            n_rows: 2,
            n_cols: 2,
            data: vec![
                // 不足: 1 セル → 空セル埋め
                vec![cell("H", 0.0, 0.0, 10.0, 10.0)],
                // 超過: 3 セル → n_cols で打ち切り
                vec![
                    cell("A", 0.0, 10.0, 10.0, 20.0),
                    cell("B", 10.0, 10.0, 20.0, 20.0),
                    cell("DROP", 20.0, 10.0, 30.0, 20.0),
                ],
            ],
        };
        let doc = doc_with_blocks(vec![DocBlock::Table(t)]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "| H |  |\n| --- | --- |\n| A | B |"
        );
    }

    #[test]
    fn markdown_escape_backslash_before_pipe() {
        // `\` を先に `\\` へ、その後 `|` を `\|` へ
        let t = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 50.0,
                bottom: 20.0,
            },
            n_rows: 1,
            n_cols: 1,
            data: vec![vec![cell(r"a\b|c", 0.0, 0.0, 10.0, 10.0)]],
        };
        let doc = doc_with_blocks(vec![DocBlock::Table(t)]);
        assert_eq!(document_to_markdown(&doc, true), "| a\\\\b\\|c |\n| --- |");
    }

    #[test]
    fn markdown_control_chars_to_space() {
        let mixed = "a\nb\rc\u{2028}d\u{2029}e\tf\u{0001}g";
        let doc = doc_with_blocks(vec![
            text_block(TextBlockKind::Heading { level: 1 }, mixed),
            text_block(TextBlockKind::Paragraph, mixed),
            DocBlock::Table(Table {
                extraction_method: "lattice",
                bbox: BBox {
                    x0: 0.0,
                    top: 0.0,
                    x1: 20.0,
                    bottom: 20.0,
                },
                n_rows: 1,
                n_cols: 1,
                data: vec![vec![cell(mixed, 0.0, 0.0, 10.0, 10.0)]],
            }),
        ]);
        let md = document_to_markdown(&doc, true);
        assert_eq!(
            md,
            "# a b c d e f g\n\na b c d e f g\n\n| a b c d e f g |\n| --- |"
        );
        assert!(!md.contains('\t'));
        assert!(!md.contains('\u{2028}'));
        assert!(!md.contains('\u{2029}'));
        assert!(!md.contains('\u{0001}'));
    }

    #[test]
    fn markdown_escape_leading_block_markers() {
        let doc = doc_with_blocks(vec![
            text_block(TextBlockKind::Paragraph, "# not a heading"),
            text_block(TextBlockKind::Paragraph, "  - not a list"),
            text_block(TextBlockKind::Paragraph, "* star"),
            text_block(TextBlockKind::Paragraph, "+ plus"),
            text_block(TextBlockKind::Paragraph, "> quote"),
            text_block(TextBlockKind::Paragraph, "| pipe"),
            text_block(TextBlockKind::Paragraph, "### triple"),
            text_block(TextBlockKind::Paragraph, r"a\b mid"),
            text_block(TextBlockKind::Heading { level: 1 }, "# title-ish"),
            text_block(TextBlockKind::Paragraph, "mid # not escaped"),
        ]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "\\# not a heading\n\n  \\- not a list\n\n\\* star\n\n\\+ plus\n\n\
             \\> quote\n\n\\| pipe\n\n\\### triple\n\na\\\\b mid\n\n# \\# title-ish\n\n\
             mid # not escaped"
        );
    }

    #[test]
    fn markdown_escape_markdown_false_skips_body_escape() {
        let doc = doc_with_blocks(vec![
            text_block(TextBlockKind::Paragraph, "# keep"),
            text_block(TextBlockKind::Paragraph, "- keep"),
            text_block(TextBlockKind::Paragraph, r"a\b"),
            text_block(TextBlockKind::Heading { level: 2 }, "# h"),
            DocBlock::Table(Table {
                extraction_method: "lattice",
                bbox: BBox {
                    x0: 0.0,
                    top: 0.0,
                    x1: 20.0,
                    bottom: 20.0,
                },
                n_rows: 1,
                n_cols: 1,
                data: vec![vec![cell(r"a|b\c", 0.0, 0.0, 10.0, 10.0)]],
            }),
        ]);
        // 本文エスケープはオフ、見出し接頭辞とセル・制御文字は常時
        assert_eq!(
            document_to_markdown(&doc, false),
            "# keep\n\n- keep\n\na\\b\n\n## # h\n\n| a\\|b\\\\c |\n| --- |"
        );
    }

    #[test]
    fn markdown_join_pages_and_blocks() {
        let doc = DocDoc {
            pages: vec![
                DocPage {
                    page_number: 1,
                    width: 600.0,
                    height: 800.0,
                    fonts: vec![],
                    chars: vec![],
                    blocks: vec![
                        text_block(TextBlockKind::Paragraph, "p1"),
                        text_block(TextBlockKind::Paragraph, "p2"),
                    ],
                },
                DocPage {
                    page_number: 2,
                    width: 600.0,
                    height: 800.0,
                    fonts: vec![],
                    chars: vec![],
                    blocks: vec![], // 空ページは要素を出さない
                },
                DocPage {
                    page_number: 3,
                    width: 600.0,
                    height: 800.0,
                    fonts: vec![],
                    chars: vec![],
                    blocks: vec![text_block(TextBlockKind::Paragraph, "p3")],
                },
            ], warnings: Vec::new(),
        };
        let md = document_to_markdown(&doc, true);
        assert_eq!(md, "p1\n\np2\n\np3");
        assert!(!md.ends_with('\n'));
    }

    #[test]
    fn markdown_empty_doc_and_empty_paragraph() {
        let empty = DocDoc { pages: vec![], warnings: Vec::new() };
        assert_eq!(document_to_markdown(&empty, true), "");

        let empty_pages = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 1.0,
                height: 1.0,
                fonts: vec![],
                chars: vec![],
                blocks: vec![],
            }], warnings: Vec::new(),
        };
        assert_eq!(document_to_markdown(&empty_pages, true), "");

        // 空段落は非空ブロックではない
        let empty_para = doc_with_blocks(vec![
            text_block(TextBlockKind::Paragraph, ""),
            text_block(TextBlockKind::Paragraph, "x"),
        ]);
        assert_eq!(document_to_markdown(&empty_para, true), "x");
    }

    #[test]
    fn markdown_skips_zero_dim_tables() {
        let zero_rows = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 10.0,
                bottom: 10.0,
            },
            n_rows: 0,
            n_cols: 2,
            data: vec![],
        };
        let zero_cols = Table {
            extraction_method: "lattice",
            bbox: BBox {
                x0: 0.0,
                top: 0.0,
                x1: 10.0,
                bottom: 10.0,
            },
            n_rows: 2,
            n_cols: 0,
            data: vec![vec![], vec![]],
        };
        let doc = doc_with_blocks(vec![
            DocBlock::Table(zero_rows),
            text_block(TextBlockKind::Paragraph, "keep"),
            DocBlock::Table(zero_cols),
        ]);
        assert_eq!(document_to_markdown(&doc, true), "keep");
    }

    /// 制御文字・空白のみの見出し・段落は Markdown に出さない
    #[test]
    fn markdown_skips_whitespace_only_text_blocks() {
        let doc = doc_with_blocks(vec![
            text_block(TextBlockKind::Heading { level: 1 }, "\t\n\u{0001}"),
            text_block(TextBlockKind::Paragraph, "\r\n  \t"),
            text_block(TextBlockKind::Paragraph, "keep"),
            text_block(TextBlockKind::Heading { level: 2 }, "   "),
            text_block(TextBlockKind::Paragraph, "\u{2028}\u{2029}"),
        ]);
        assert_eq!(document_to_markdown(&doc, true), "keep");
    }

    /// ベースラインの揃った2列ページ（行が列をまたぐ）
    fn two_col_aligned_page() -> TextPage {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        let left = ["A", "B", "C", "D", "E"];
        let right = ["F", "G", "H", "I", "J"];
        for i in 0..5 {
            let y = 20.0 + i as f64 * 15.0;
            chars.push(ch(left[i], 20.0, y, adv, 0.0, fs));
            chars.push(ch(right[i], 100.0, y, adv, 0.0, fs));
        }
        TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false)],
            chars,
        }
    }

    #[test]
    fn columns_aligned_two_col_reading_order() {
        let p = two_col_aligned_page();
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].text, "A B C D E");
        assert_eq!(tb[1].text, "F G H I J");
        assert!(tb[0].left < tb[1].left);
    }

    #[test]
    fn columns_line_fragment_whitespace_and_bbox() {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        // ストリーム順と進行軸順が逆転する行:
        // chars 配列は右語 F → 列間空白 → 左語 A → 先頭空白相当の順で積み、
        // 表示 x は A が左・F が右。build_text_lines が進行軸順に並べ替えた
        // line.chars の相対順を断片が保つことを検証する
        // インデックス: 0=F(右), 1=空白(列間), 2=A(左), 3=空白(A 左隣)
        chars.push(ch("F", 100.0, 20.0, adv, 0.0, fs));
        chars.push(ch(" ", 50.0, 20.0, 5.0, 0.0, fs));
        chars.push(ch("A", 20.0, 20.0, adv, 0.0, fs));
        chars.push(ch(" ", 10.0, 20.0, 5.0, 0.0, fs));
        let left = ["B", "C", "D", "E"];
        let right = ["G", "H", "I", "J"];
        for i in 0..4 {
            let y = 20.0 + (i + 1) as f64 * 15.0;
            // 右列を先にストリーム投入（x は左が小さい）
            chars.push(ch(right[i], 100.0, y, adv, 0.0, fs));
            chars.push(ch(left[i], 20.0, y, adv, 0.0, fs));
        }
        let p = TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false)],
            chars,
        };
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].text, "A B C D E");
        assert_eq!(tb[1].text, "F G H I J");

        let left0 = &tb[0].lines[0];
        assert_eq!(left0.words.len(), 1);
        assert_eq!(left0.words[0].text, "A");
        // 先頭空白は直後の単語（A）側、列間空白は直前の単語（A）側
        let left_ws: Vec<_> = left0
            .chars
            .iter()
            .filter(|&&i| is_whitespace_str(&p.chars[i as usize].text))
            .copied()
            .collect();
        assert_eq!(left_ws.len(), 2);
        // 進行軸順: 空白(x=10, idx3) → A(idx2) → 空白(x=50, idx1)
        // 断片 chars は元 line.chars の相対順（進行軸順）を保ち、
        // ストリーム index 昇順ではない
        assert_eq!(left0.chars, vec![3, 2, 1]);
        // bbox は非空白のみ（A）
        assert!((left0.left - 20.0).abs() < 1e-9);
        assert!((left0.right - 25.0).abs() < 1e-9);

        let right0 = &tb[1].lines[0];
        assert_eq!(right0.words.len(), 1);
        assert_eq!(right0.words[0].text, "F");
        assert!(
            right0
                .chars
                .iter()
                .all(|&i| !is_whitespace_str(&p.chars[i as usize].text))
        );
        assert_eq!(right0.chars, vec![0]);
        assert!((right0.left - 100.0).abs() < 1e-9);
    }

    #[test]
    fn columns_staggered_two_col_leaf_assign_only() {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        let left = ["A", "B", "C", "D", "E"];
        let right = ["F", "G", "H", "I", "J"];
        for i in 0..5 {
            let yl = 20.0 + i as f64 * 16.0;
            let yr = 28.0 + i as f64 * 16.0;
            chars.push(ch(left[i], 20.0, yl, adv, 0.0, fs));
            chars.push(ch(right[i], 100.0, yr, adv, 0.0, fs));
        }
        let p = TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false)],
            chars,
        };
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        // 行は元々別なので断片分割は不要。葉割り当てで左→右
        let texts: Vec<&str> = tb.iter().map(|t| t.text.as_str()).collect();
        let joined = texts.join(" ");
        let left_pos = joined.find('A').expect("A");
        let right_pos = joined.find('F').expect("F");
        assert!(left_pos < right_pos);
        for t in &tb {
            for line in &t.lines {
                // 1行1語（列をまたがない）
                assert_eq!(line.words.len(), 1);
            }
        }
    }

    #[test]
    fn columns_table_and_two_col_order() {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        let left = ["A", "B", "C", "D", "E"];
        let right = ["F", "G", "H", "I", "J"];
        for i in 0..5 {
            let y = 40.0 + i as f64 * 15.0;
            chars.push(ch(left[i], 20.0, y, adv, 0.0, fs));
            chars.push(ch(right[i], 100.0, y, adv, 0.0, fs));
        }
        let p = TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false)],
            chars,
        };
        // 全幅の表（Y分割で上帯へ）
        let t = table_one(
            vec![vec![cell("T", 20.0, 5.0, 180.0, 24.0)]],
            20.0,
            5.0,
            180.0,
            24.0,
        );
        let blocks = build_blocks(&p, &[t]);
        assert!(matches!(blocks[0], DocBlock::Table(_)));
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 2);
        assert_eq!(tb[0].text, "A B C D E");
        assert_eq!(tb[1].text, "F G H I J");
        // 生成番号: 表0、左本文1、右本文2 → 葉順でも表が先頭
        assert_eq!(blocks.len(), 3);
    }

    #[test]
    fn columns_single_column_matches_legacy() {
        let fs = 10.0;
        let adv = 5.0;
        let p = page(vec![
            ch("A", 0.0, 100.0, adv, 0.0, fs),
            ch("B", adv, 100.0, adv, 0.0, fs),
            ch("C", 0.0, 115.0, adv, 0.0, fs),
            ch("D", adv, 115.0, adv, 0.0, fs),
        ]);
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        assert_eq!(tb.len(), 1);
        assert_eq!(tb[0].text, "AB CD");
        assert_eq!(tb[0].lines.len(), 2);
        assert_eq!(tb[0].kind, TextBlockKind::Paragraph);
        assert!((tb[0].left - 0.0).abs() < 1e-9);
        assert!((tb[0].top - 100.0).abs() < 1e-9);
    }

    #[test]
    fn columns_vertical_line_stays_one_block() {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        let left = ["A", "B", "C", "D", "E"];
        let right = ["F", "G", "H", "I", "J"];
        for i in 0..5 {
            let y = 20.0 + i as f64 * 15.0;
            chars.push(ch(left[i], 20.0, y, adv, 0.0, fs));
            chars.push(ch(right[i], 100.0, y, adv, 0.0, fs));
        }
        // 縦書き行（OtherLine）
        chars.push(ch_at("あ", 170.0, 30.0, 0.0, 10.0, fs, 1, true));
        chars.push(ch_at("い", 170.0, 40.0, 0.0, 10.0, fs, 1, true));
        let p = TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false), font(true)],
            chars,
        };
        let blocks = build_blocks(&p, &[]);
        let tb = text_blocks(&blocks);
        let vert: Vec<_> = tb.iter().filter(|t| t.dir == "ttb").collect();
        assert_eq!(vert.len(), 1);
        assert_eq!(vert[0].text, "あい");
        assert_eq!(vert[0].lines.len(), 1);
        assert_eq!(vert[0].lines[0].words.len(), 1);
    }

    #[test]
    fn columns_headings_and_markdown_pipeline() {
        let fs = 10.0;
        let adv = 5.0;
        let mut chars = Vec::new();
        // 左列先頭を大きめ見出し相当
        chars.push(ch("T", 20.0, 20.0, adv, 0.0, 18.0));
        chars.push(ch("U", 100.0, 20.0, adv, 0.0, fs));
        let left = ["B", "C", "D", "E"];
        let right = ["V", "W", "X", "Y"];
        for i in 0..4 {
            let y = 20.0 + (i + 1) as f64 * 15.0;
            chars.push(ch(left[i], 20.0, y, adv, 0.0, fs));
            chars.push(ch(right[i], 100.0, y, adv, 0.0, fs));
        }
        let p = TextPage {
            width: 200.0,
            height: 300.0,
            fonts: vec![font(false)],
            chars,
        };
        let blocks = build_blocks(&p, &[]);
        let mut doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: p.width,
                height: p.height,
                fonts: p.fonts.clone(),
                chars: p.chars.clone(),
                blocks,
            }], warnings: Vec::new(),
        };
        assign_headings(&mut doc);
        let md = document_to_markdown(&doc, true);
        // 左列が先に出る
        let pos_t = md.find('T').expect("T");
        let pos_u = md.find('U').expect("U");
        assert!(pos_t < pos_u);
        let kinds = text_kinds(&doc);
        let title = kinds.iter().find(|(t, _)| *t == "T").unwrap();
        assert_eq!(title.1, TextBlockKind::Heading { level: 1 });
        assert!(md.starts_with("# T") || md.contains("# T"));
    }

    // --- ヘッダ・フッタ ---

    /// 1行・代表 font_size 付きの本文ブロックを作る
    fn furniture_block(
        text: &str,
        left: f64,
        top: f64,
        right: f64,
        bottom: f64,
        fs: f64,
        chars: &mut Vec<TextChar>,
    ) -> TextBlock {
        let mut indices = Vec::new();
        let mut x = left;
        for ch_c in text.chars() {
            let s = ch_c.to_string();
            let idx = chars.len() as u32;
            chars.push(TextChar {
                text: s.clone(),
                left: x,
                right: x + 1.0,
                top,
                bottom,
                transform: [fs, 0.0, 0.0, -fs, x, top],
                advance: [1.0, 0.0],
                glyph_width: None,
                font: 0,
                font_size: fs,
                rot: 0,
                upright: true,
                synthetic: false,
            });
            indices.push(idx);
            x += 1.0;
        }
        let word = TextWord {
            text: text.into(),
            left,
            right,
            top,
            bottom,
            chars: indices.clone(),
        };
        let line = TextLine {
            left,
            right,
            top,
            bottom,
            dir: "ltr".into(),
            rot: 0,
            words: vec![word],
            chars: indices,
        };
        TextBlock {
            kind: TextBlockKind::Paragraph,
            role: TextBlockRole::Body,
            text: text.into(),
            left,
            right,
            top,
            bottom,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![line],
        }
    }

    fn furniture_page(
        page_number: usize,
        width: f64,
        height: f64,
        blocks: Vec<TextBlock>,
        chars: Vec<TextChar>,
    ) -> DocPage {
        DocPage {
            page_number,
            width,
            height,
            fonts: vec![],
            chars,
            blocks: blocks.into_iter().map(DocBlock::Text).collect(),
        }
    }

    fn roles_of(doc: &DocDoc) -> Vec<Vec<TextBlockRole>> {
        doc.pages
            .iter()
            .map(|p| {
                p.blocks
                    .iter()
                    .filter_map(|b| match b {
                        DocBlock::Text(t) => Some(t.role),
                        _ => None,
                    })
                    .collect()
            })
            .collect()
    }

    #[test]
    fn extract_options_detect_header_footer_default_false() {
        assert!(!ExtractOptions::default().detect_header_footer);
    }

    #[test]
    fn extract_options_escape_markdown_default_true() {
        assert!(ExtractOptions::default().escape_markdown);
        let parsed: ExtractOptions = serde_json::from_str("{}").unwrap();
        assert!(parsed.escape_markdown);
        let off: ExtractOptions = serde_json::from_str(r#"{"escape_markdown":false}"#).unwrap();
        assert!(!off.escape_markdown);
    }

    #[test]
    fn extract_options_detect_lists_default_true() {
        assert!(ExtractOptions::default().detect_lists);
        let parsed: ExtractOptions = serde_json::from_str("{}").unwrap();
        assert!(parsed.detect_lists);
        let off: ExtractOptions = serde_json::from_str(r#"{"detect_lists":false}"#).unwrap();
        assert!(!off.detect_lists);
    }

    #[test]
    fn extract_options_bidi_default_false() {
        assert!(!ExtractOptions::default().bidi);
        let parsed: ExtractOptions = serde_json::from_str("{}").unwrap();
        assert!(!parsed.bidi);
        let on: ExtractOptions = serde_json::from_str(r#"{"bidi":true}"#).unwrap();
        assert!(on.bidi);
    }

    #[test]
    fn furniture_band_boundary_exactly_one_sixth() {
        // height=600 → 1/6=100, 5/6=500。bottom ちょうど 100 は header 候補
        let h = 600.0;
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        let h1 = furniture_block("HDR", 10.0, 80.0, 50.0, 100.0, 10.0, &mut ca);
        let bd1 = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut ca);
        let h2 = furniture_block("HDR", 10.0, 80.0, 50.0, 100.0, 10.0, &mut cb);
        let bd2 = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, h, vec![h1, bd1], ca),
                furniture_page(2, 400.0, h, vec![h2, bd2], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(
            roles_of(&doc),
            vec![
                vec![TextBlockRole::Header, TextBlockRole::Body],
                vec![TextBlockRole::Header, TextBlockRole::Body],
            ]
        );

        // footer: top ちょうど 500
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        let f1 = furniture_block("FTR", 10.0, 500.0, 50.0, 520.0, 10.0, &mut ca);
        let bd1 = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut ca);
        let f2 = furniture_block("FTR", 10.0, 500.0, 50.0, 520.0, 10.0, &mut cb);
        let bd2 = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, h, vec![bd1, f1], ca),
                furniture_page(2, 400.0, h, vec![bd2, f2], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        let roles = roles_of(&doc);
        assert!(roles[0].contains(&TextBlockRole::Footer));
        assert!(roles[1].contains(&TextBlockRole::Footer));
    }

    #[test]
    fn furniture_edge_gap_exactly_30() {
        let h = 600.0;
        // 2要素ヘッダ: 1つ目 bottom=20, 2つ目 top=50 → gap=30
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            let a = furniture_block("A", 10.0, 5.0, 40.0, 20.0, 10.0, &mut chars);
            let b = furniture_block("B", 10.0, 50.0, 40.0, 65.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![a, b, body], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        for page in &doc.pages {
            let roles: Vec<_> = page
                .blocks
                .iter()
                .filter_map(|b| match b {
                    DocBlock::Text(t) => Some((t.text.as_str(), t.role)),
                    _ => None,
                })
                .collect();
            assert_eq!(roles[0], ("A", TextBlockRole::Header));
            assert_eq!(roles[1], ("B", TextBlockRole::Header));
            assert_eq!(roles[2], ("body", TextBlockRole::Body));
        }

        // gap 30 超（31）で2要素目は不成立
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            let a = furniture_block("A", 10.0, 5.0, 40.0, 20.0, 10.0, &mut chars);
            let b = furniture_block("B", 10.0, 51.0, 40.0, 66.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![a, b, body], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        for page in &doc.pages {
            let roles: Vec<_> = page
                .blocks
                .iter()
                .filter_map(|b| match b {
                    DocBlock::Text(t) => Some((t.text.as_str(), t.role)),
                    _ => None,
                })
                .collect();
            assert_eq!(roles[0], ("A", TextBlockRole::Header));
            assert_eq!(roles[1], ("B", TextBlockRole::Body));
        }
    }

    #[test]
    fn furniture_font_ratio_exactly_1_05() {
        let h = 600.0;
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        let a = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut ca);
        let ba = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut ca);
        let b = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.5, &mut cb);
        let bb = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, h, vec![a, ba], ca),
                furniture_page(2, 400.0, h, vec![b, bb], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Header);
        assert_eq!(roles_of(&doc)[1][0], TextBlockRole::Header);

        // 1.05 超
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        let a = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut ca);
        let ba = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut ca);
        let b = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.51, &mut cb);
        let bb = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, h, vec![a, ba], ca),
                furniture_page(2, 400.0, h, vec![b, bb], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Body);
        assert_eq!(roles_of(&doc)[1][0], TextBlockRole::Body);
    }

    #[test]
    fn furniture_bbox_touch_only_no_match() {
        let h = 600.0;
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        // 接するだけ: a.right == b.left
        let a = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut ca);
        let ba = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut ca);
        let b = furniture_block("HDR", 50.0, 10.0, 90.0, 25.0, 10.0, &mut cb);
        let bb = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, h, vec![a, ba], ca),
                furniture_page(2, 400.0, h, vec![b, bb], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Body);
        assert_eq!(roles_of(&doc)[1][0], TextBlockRole::Body);
    }

    #[test]
    fn furniture_same_top_tiebreak_by_block_index() {
        let h = 600.0;
        // 同一 top の2候補: 添字昇順で C_p が並ぶ。各ページ同じ text 列で一致
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            let a = furniture_block("A", 10.0, 10.0, 40.0, 25.0, 10.0, &mut chars);
            let b = furniture_block("B", 50.0, 10.0, 80.0, 25.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![a, b, body], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        // k=0 で A どうし一致、k=1 で B どうし（隣接 gap=10-25 負=重なり相当で OK）
        // top same: A bottom 25, B top 10 → gap = 10-25 = -15 ≤ 30
        for page in &doc.pages {
            let roles: Vec<_> = page
                .blocks
                .iter()
                .filter_map(|b| match b {
                    DocBlock::Text(t) => Some((t.text.as_str(), t.role)),
                    _ => None,
                })
                .collect();
            assert_eq!(roles[0].1, TextBlockRole::Header);
            assert_eq!(roles[1].1, TextBlockRole::Header);
        }
    }

    #[test]
    fn furniture_empty_doc_and_empty_pages() {
        let mut empty = DocDoc { pages: vec![], warnings: Vec::new() };
        assign_header_footer(&mut empty);
        assert!(empty.pages.is_empty());

        let mut pages = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, 600.0, vec![], vec![]),
                furniture_page(2, 400.0, 600.0, vec![], vec![]),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut pages);
        assert!(roles_of(&pages).iter().all(|r| r.is_empty()));
    }

    #[test]
    fn furniture_single_page_no_role() {
        let mut chars = Vec::new();
        let h = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut chars);
        let mut doc = DocDoc {
            pages: vec![furniture_page(1, 400.0, 600.0, vec![h], chars)], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Body);
    }

    #[test]
    fn furniture_non_positive_page_height() {
        let mut ca = Vec::new();
        let mut cb = Vec::new();
        let a = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut ca);
        let b = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut cb);
        let mut doc = DocDoc {
            pages: vec![
                furniture_page(1, 400.0, 0.0, vec![a], ca),
                furniture_page(2, 400.0, f64::NAN, vec![b], cb),
            ], warnings: Vec::new(),
        };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Body);
        assert_eq!(roles_of(&doc)[1][0], TextBlockRole::Body);
    }

    #[test]
    fn furniture_mirror_d2_and_rescue() {
        // 3ページ鏡映フッタ: 全幅で bbox 交差する "N  Author" / "Author  N" は骨格不一致
        // d=2 で 1 と 3 が一致、中央は救済
        // 簡約: 全ページ "Page N" 同位置（d=1 で足りる）ではなく、
        // 鏡映は骨格不一致なので d=1 では落ち、d=2 で "Page 1" vs "Page 3" は d=2 で一致
        let h = 600.0;
        let mut pages = Vec::new();
        for (pi, n) in [(0usize, 1u32), (1, 2), (2, 3)] {
            let mut chars = Vec::new();
            let text = format!("Page {n}");
            // 奇偶で x を少しずらすが交差は残す
            let left = if pi % 2 == 0 { 100.0 } else { 120.0 };
            let f = furniture_block(&text, left, 520.0, left + 80.0, 540.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![body, f], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        for page in &doc.pages {
            let footer = page.blocks.iter().find_map(|b| match b {
                DocBlock::Text(t) if t.text.starts_with("Page") => Some(t.role),
                _ => None,
            });
            assert_eq!(footer, Some(TextBlockRole::Footer));
        }

        // 3ページで中央のみ骨格が鏡映（数字位置が違う）: "X 1" / "2 X" / "X 3"
        // residual は "X" で一致、値 1,2,3
        let mut pages = Vec::new();
        let texts = ["X 1", "2 X", "X 3"];
        for (pi, text) in texts.iter().enumerate() {
            let mut chars = Vec::new();
            let f = furniture_block(text, 50.0, 520.0, 150.0, 540.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![body, f], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        // d=1: 骨格不一致で不成立。d=2: "X 1" vs "X 3" は骨格一致・値+2 で成立
        // 中央 "2 X" は救済（鏡映一致 + 値連続）
        for page in &doc.pages {
            let role = page.blocks.iter().find_map(|b| match b {
                DocBlock::Text(t) if t.text != "body" => Some(t.role),
                _ => None,
            });
            assert_eq!(
                role,
                Some(TextBlockRole::Footer),
                "page {}",
                page.page_number
            );
        }
    }

    #[test]
    fn furniture_idempotent_reapply() {
        let h = 600.0;
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            let hd = furniture_block("HDR", 10.0, 10.0, 50.0, 25.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![hd, body], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        let once = roles_of(&doc);
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc), once);
        // 既に Header が付いた状態から再適用しても同じ
        assert_eq!(once[0][0], TextBlockRole::Header);
    }

    #[test]
    fn furniture_assign_headings_excludes_non_body() {
        // 大きい font のヘッダが母集団に入ると mode がずれる構成
        let h = 600.0;
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            // ヘッダを多数の大きいグリフで
            let hd = furniture_block("HHHHHH", 10.0, 10.0, 80.0, 30.0, 20.0, &mut chars);
            // 本文
            let body = furniture_block("bbbbbb", 10.0, 200.0, 80.0, 220.0, 10.0, &mut chars);
            // 見出し候補（本文の 1.8 倍 = 18）
            let title = furniture_block("Title", 10.0, 100.0, 80.0, 120.0, 18.0, &mut chars);
            pages.push(furniture_page(
                pi + 1,
                400.0,
                h,
                vec![hd, title, body],
                chars,
            ));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        assign_headings(&mut doc);
        // ヘッダ除外後の mode は 10 → Title 18 は level 1
        for page in &doc.pages {
            for b in &page.blocks {
                if let DocBlock::Text(t) = b {
                    if t.text == "Title" {
                        assert_eq!(t.kind, TextBlockKind::Heading { level: 1 });
                    }
                    if t.text == "HHHHHH" {
                        assert_eq!(t.role, TextBlockRole::Header);
                        assert_eq!(t.kind, TextBlockKind::Paragraph);
                    }
                }
            }
        }
    }

    #[test]
    fn furniture_markdown_skips_non_body() {
        let doc = doc_with_blocks(vec![
            DocBlock::Text(TextBlock {
                kind: TextBlockKind::Paragraph,
                role: TextBlockRole::Header,
                text: "header".into(),
                left: 0.0,
                right: 10.0,
                top: 0.0,
                bottom: 10.0,
                dir: "ltr".into(),
                rot: 0,
                lines: vec![],
            }),
            text_block(TextBlockKind::Paragraph, "body"),
            DocBlock::Text(TextBlock {
                kind: TextBlockKind::Paragraph,
                role: TextBlockRole::Footer,
                text: "footer".into(),
                left: 0.0,
                right: 10.0,
                top: 0.0,
                bottom: 10.0,
                dir: "ltr".into(),
                rot: 0,
                lines: vec![],
            }),
        ]);
        assert_eq!(document_to_markdown(&doc, true), "body");
    }

    #[test]
    fn furniture_json_body_role_preserves_paragraph_and_heading_shapes() {
        let tb = TextBlock {
            kind: TextBlockKind::Paragraph,
            role: TextBlockRole::Body,
            text: "x".into(),
            left: 0.0,
            right: 1.0,
            top: 2.0,
            bottom: 3.0,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![],
        };
        let json = serde_json::to_string(&DocBlock::Text(tb)).unwrap();
        assert_eq!(
            json,
            r#"{"type":"text","kind":"paragraph","text":"x","left":0.0,"right":1.0,"top":2.0,"bottom":3.0,"dir":"ltr","rot":0,"lines":[]}"#
        );

        let tb = TextBlock {
            kind: TextBlockKind::Heading { level: 2 },
            role: TextBlockRole::Body,
            text: "Title".into(),
            left: 10.0,
            right: 20.0,
            top: 30.0,
            bottom: 40.0,
            dir: "ttb".into(),
            rot: 90,
            lines: vec![],
        };
        let json = serde_json::to_string(&DocBlock::Text(tb)).unwrap();
        assert_eq!(
            json,
            r#"{"type":"text","kind":"heading","level":2,"text":"Title","left":10.0,"right":20.0,"top":30.0,"bottom":40.0,"dir":"ttb","rot":90,"lines":[]}"#
        );

        let tb = TextBlock {
            kind: TextBlockKind::Paragraph,
            role: TextBlockRole::Header,
            text: "x".into(),
            left: 0.0,
            right: 1.0,
            top: 0.0,
            bottom: 1.0,
            dir: "ltr".into(),
            rot: 0,
            lines: vec![],
        };
        let json = serde_json::to_string(&DocBlock::Text(tb)).unwrap();
        assert!(json.contains(r#""role":"header""#));
    }

    #[test]
    fn furniture_static_header_two_pages() {
        let h = 600.0;
        let mut pages = Vec::new();
        for pi in 0..2 {
            let mut chars = Vec::new();
            let hd = furniture_block("Company", 10.0, 10.0, 80.0, 25.0, 10.0, &mut chars);
            let body = furniture_block("body", 10.0, 200.0, 50.0, 220.0, 10.0, &mut chars);
            pages.push(furniture_page(pi + 1, 400.0, h, vec![hd, body], chars));
        }
        let mut doc = DocDoc { pages, warnings: Vec::new() };
        assign_header_footer(&mut doc);
        assert_eq!(roles_of(&doc)[0][0], TextBlockRole::Header);
        assert_eq!(roles_of(&doc)[1][0], TextBlockRole::Header);
        assert_eq!(document_to_markdown(&doc, true), "body\n\nbody");
    }

    fn font_style(name: &str, bold: bool, italic: bool) -> TextFont {
        TextFont {
            name: name.into(),
            ascent: 0.8,
            descent: -0.2,
            vertical: false,
            bold,
            italic,
        }
    }

    /// 文字を追加しインデックスを返す
    fn push_styled_ch(chars: &mut Vec<TextChar>, text: &str, x: f64, y: f64, font_idx: u32) -> u32 {
        let idx = chars.len() as u32;
        let adv = (text.chars().count() as f64 * 5.0).max(1.0);
        chars.push(TextChar {
            text: text.into(),
            left: x,
            right: x + adv,
            top: y,
            bottom: y + 10.0,
            transform: [10.0, 0.0, 0.0, -10.0, x, y],
            advance: [adv, 0.0],
            glyph_width: None,
            font: font_idx,
            font_size: 10.0,
            rot: 0,
            upright: true,
            synthetic: false,
        });
        idx
    }

    fn word_from_indices(chars: &[TextChar], indices: &[u32], left: f64, top: f64) -> TextWord {
        let text: String = indices
            .iter()
            .filter_map(|&i| chars.get(i as usize).map(|c| c.text.as_str()))
            .collect();
        let right = indices
            .last()
            .and_then(|&i| chars.get(i as usize).map(|c| c.right))
            .unwrap_or(left);
        TextWord {
            text,
            left,
            right,
            top,
            bottom: top + 10.0,
            chars: indices.to_vec(),
        }
    }

    fn line_from_words(words: Vec<TextWord>) -> TextLine {
        let left = words.iter().map(|w| w.left).fold(f64::INFINITY, f64::min);
        let right = words
            .iter()
            .map(|w| w.right)
            .fold(f64::NEG_INFINITY, f64::max);
        let top = words.first().map(|w| w.top).unwrap_or(0.0);
        let bottom = top + 10.0;
        let line_chars: Vec<u32> = words.iter().flat_map(|w| w.chars.iter().copied()).collect();
        TextLine {
            left,
            right,
            top,
            bottom,
            dir: "ltr".into(),
            rot: 0,
            words,
            chars: line_chars,
        }
    }

    fn doc_styled(
        fonts: Vec<TextFont>,
        chars: Vec<TextChar>,
        kind: TextBlockKind,
        lines: Vec<TextLine>,
    ) -> DocDoc {
        let text = match &kind {
            TextBlockKind::List { .. } => {
                // リストは assign 後の text 相当を手で組まない。lines から項目本文を結合
                let mut entries = Vec::new();
                let mut i = 0;
                while i < lines.len() {
                    if list_marker_kind(&lines[i]).is_none() {
                        i += 1;
                        continue;
                    }
                    let start = i;
                    i += 1;
                    while i < lines.len() && list_marker_kind(&lines[i]).is_none() {
                        i += 1;
                    }
                    let body = join_paragraph_text(&list_item_body_lines(&lines[start..i]));
                    if !body.trim().is_empty() {
                        entries.push(body);
                    }
                }
                entries.join("\n")
            }
            _ => join_paragraph_text(&lines),
        };
        let left = lines.iter().map(|l| l.left).fold(f64::INFINITY, f64::min);
        let right = lines
            .iter()
            .map(|l| l.right)
            .fold(f64::NEG_INFINITY, f64::max);
        let top = lines.iter().map(|l| l.top).fold(f64::INFINITY, f64::min);
        let bottom = lines
            .iter()
            .map(|l| l.bottom)
            .fold(f64::NEG_INFINITY, f64::max);
        DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 600.0,
                height: 800.0,
                fonts,
                chars,
                blocks: vec![DocBlock::Text(TextBlock {
                    kind,
                    role: TextBlockRole::Body,
                    text,
                    left,
                    right,
                    top,
                    bottom,
                    dir: "ltr".into(),
                    rot: 0,
                    lines,
                })],
            }],
            warnings: Vec::new(),
        }
    }

    #[test]
    fn markdown_emphasis_four_styles() {
        let fonts = vec![
            font_style("R", false, false),
            font_style("B", true, false),
            font_style("I", false, true),
            font_style("BI", true, true),
        ];
        let mut chars = Vec::new();
        let i0 = push_styled_ch(&mut chars, "plain", 0.0, 0.0, 0);
        let i1 = push_styled_ch(&mut chars, "bold", 40.0, 0.0, 1);
        let i2 = push_styled_ch(&mut chars, "ital", 80.0, 0.0, 2);
        let i3 = push_styled_ch(&mut chars, "both", 120.0, 0.0, 3);
        let line = line_from_words(vec![
            word_from_indices(&chars, &[i0], 0.0, 0.0),
            word_from_indices(&chars, &[i1], 40.0, 0.0),
            word_from_indices(&chars, &[i2], 80.0, 0.0),
            word_from_indices(&chars, &[i3], 120.0, 0.0),
        ]);
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, vec![line]);
        assert_eq!(
            document_to_markdown(&doc, true),
            "plain **bold** *ital* ***both***"
        );
    }

    #[test]
    fn markdown_emphasis_mid_word_switch() {
        let fonts = vec![font_style("R", false, false), font_style("B", true, false)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "He", 0.0, 0.0, 1);
        let b = push_styled_ch(&mut chars, "llo", 10.0, 0.0, 0);
        let line = line_from_words(vec![word_from_indices(&chars, &[a, b], 0.0, 0.0)]);
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, vec![line]);
        assert_eq!(document_to_markdown(&doc, true), "**He**llo");
    }

    #[test]
    fn markdown_emphasis_merges_same_style_words() {
        let fonts = vec![font_style("B", true, false)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "foo", 0.0, 0.0, 0);
        let b = push_styled_ch(&mut chars, "bar", 30.0, 0.0, 0);
        let line = line_from_words(vec![
            word_from_indices(&chars, &[a], 0.0, 0.0),
            word_from_indices(&chars, &[b], 30.0, 0.0),
        ]);
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, vec![line]);
        assert_eq!(document_to_markdown(&doc, true), "**foo bar**");
    }

    #[test]
    fn markdown_emphasis_per_line_hard_break() {
        let fonts = vec![font_style("I", false, true)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "hello", 0.0, 0.0, 0);
        let b = push_styled_ch(&mut chars, "world", 0.0, 12.0, 0);
        let lines = vec![
            line_from_words(vec![word_from_indices(&chars, &[a], 0.0, 0.0)]),
            line_from_words(vec![word_from_indices(&chars, &[b], 0.0, 12.0)]),
        ];
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, lines);
        assert_eq!(document_to_markdown(&doc, true), "*hello*  \n*world*");
    }

    #[test]
    fn markdown_emphasis_cjk_hard_break() {
        let fonts = vec![font_style("B", true, false)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "漢", 0.0, 0.0, 0);
        let b = push_styled_ch(&mut chars, "字", 10.0, 12.0, 0);
        let lines = vec![
            line_from_words(vec![word_from_indices(&chars, &[a], 0.0, 0.0)]),
            line_from_words(vec![word_from_indices(&chars, &[b], 10.0, 12.0)]),
        ];
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, lines);
        assert_eq!(document_to_markdown(&doc, true), "**漢**  \n**字**");
    }

    #[test]
    fn markdown_emphasis_heading_prefix_not_emphasized() {
        let fonts = vec![font_style("B", true, false)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "Title", 0.0, 0.0, 0);
        let line = line_from_words(vec![word_from_indices(&chars, &[a], 0.0, 0.0)]);
        let doc = doc_styled(
            fonts,
            chars,
            TextBlockKind::Heading { level: 2 },
            vec![line],
        );
        assert_eq!(document_to_markdown(&doc, true), "## **Title**");
    }

    #[test]
    fn markdown_emphasis_list_marker_not_emphasized() {
        let fonts = vec![font_style("B", true, false), font_style("R", false, false)];
        let mut chars = Vec::new();
        // マーカーを太字、本文を通常
        let m1 = push_styled_ch(&mut chars, "\u{2022}", 50.0, 100.0, 0);
        let b1 = push_styled_ch(&mut chars, "Alpha", 60.0, 100.0, 0);
        let m2 = push_styled_ch(&mut chars, "\u{2022}", 50.0, 115.0, 0);
        let b2 = push_styled_ch(&mut chars, "Beta", 60.0, 115.0, 0);
        let lines = vec![
            line_from_words(vec![
                word_from_indices(&chars, &[m1], 50.0, 100.0),
                word_from_indices(&chars, &[b1], 60.0, 100.0),
            ]),
            line_from_words(vec![
                word_from_indices(&chars, &[m2], 50.0, 115.0),
                word_from_indices(&chars, &[b2], 60.0, 115.0),
            ]),
        ];
        let doc = doc_styled(fonts, chars, TextBlockKind::List { ordered: false }, lines);
        assert_eq!(document_to_markdown(&doc, true), "- **Alpha**\n- **Beta**");
    }

    #[test]
    fn markdown_emphasis_ordered_list() {
        let fonts = vec![font_style("I", false, true)];
        let mut chars = Vec::new();
        let m1 = push_styled_ch(&mut chars, "1.", 50.0, 100.0, 0);
        let b1 = push_styled_ch(&mut chars, "One", 70.0, 100.0, 0);
        let m2 = push_styled_ch(&mut chars, "2.", 50.0, 115.0, 0);
        let b2 = push_styled_ch(&mut chars, "Two", 70.0, 115.0, 0);
        let lines = vec![
            line_from_words(vec![
                word_from_indices(&chars, &[m1], 50.0, 100.0),
                word_from_indices(&chars, &[b1], 70.0, 100.0),
            ]),
            line_from_words(vec![
                word_from_indices(&chars, &[m2], 50.0, 115.0),
                word_from_indices(&chars, &[b2], 70.0, 115.0),
            ]),
        ];
        let doc = doc_styled(fonts, chars, TextBlockKind::List { ordered: true }, lines);
        assert_eq!(document_to_markdown(&doc, true), "1. *One*\n2. *Two*");
    }

    #[test]
    fn markdown_emphasis_escape_star_and_backslash() {
        let fonts = vec![font_style("B", true, false)];
        let mut chars = Vec::new();
        let a = push_styled_ch(&mut chars, "a*b\\c", 0.0, 0.0, 0);
        let line = line_from_words(vec![word_from_indices(&chars, &[a], 0.0, 0.0)]);
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, vec![line]);
        // 本文中の * はエスケープ対象外、\ は \\
        assert_eq!(document_to_markdown(&doc, true), r"**a*b\\c**");
        assert_eq!(document_to_markdown(&doc, false), r"**a*b\c**");
    }

    #[test]
    fn markdown_emphasis_invalid_font_index_is_normal() {
        let fonts = vec![font_style("B", true, false)];
        let mut chars = Vec::new();
        // font 99 は不正 → 通常書体
        let a = push_styled_ch(&mut chars, "x", 0.0, 0.0, 99);
        let line = line_from_words(vec![word_from_indices(&chars, &[a], 0.0, 0.0)]);
        let doc = doc_styled(fonts, chars, TextBlockKind::Paragraph, vec![line]);
        assert_eq!(document_to_markdown(&doc, true), "x");
    }

    #[test]
    fn markdown_emphasis_invalid_char_index_falls_back() {
        let fonts = vec![font_style("B", true, false)];
        let chars = Vec::new();
        // 存在しない char index
        let line = TextLine {
            left: 0.0,
            right: 10.0,
            top: 0.0,
            bottom: 10.0,
            dir: "ltr".into(),
            rot: 0,
            words: vec![TextWord {
                text: "bold".into(),
                left: 0.0,
                right: 10.0,
                top: 0.0,
                bottom: 10.0,
                chars: vec![0],
            }],
            chars: vec![0],
        };
        let doc = DocDoc {
            pages: vec![DocPage {
                page_number: 1,
                width: 600.0,
                height: 800.0,
                fonts,
                chars,
                blocks: vec![DocBlock::Text(TextBlock {
                    kind: TextBlockKind::Paragraph,
                    role: TextBlockRole::Body,
                    text: "bold".into(),
                    left: 0.0,
                    right: 10.0,
                    top: 0.0,
                    bottom: 10.0,
                    dir: "ltr".into(),
                    rot: 0,
                    lines: vec![line],
                })],
            }], warnings: Vec::new(),
        };
        // 復元不能のため TextBlock.text へフォールバック（強調なし）
        assert_eq!(document_to_markdown(&doc, true), "bold");
    }

    #[test]
    fn markdown_emphasis_no_char_refs_falls_back() {
        let doc = doc_with_blocks(vec![text_block(TextBlockKind::Paragraph, "fallback")]);
        assert_eq!(document_to_markdown(&doc, true), "fallback");
    }
}