fm/io/

display.rs

use std::{
    io::{self, Stdout, Write},
    rc::Rc,
};

use anyhow::{bail, Result};
use crossterm::{
    execute,
    terminal::{disable_raw_mode, LeaveAlternateScreen},
};
use nucleo::Config;
use parking_lot::MutexGuard;
use ratatui::{
    backend::CrosstermBackend,
    layout::{Constraint, Direction, Layout, Offset, Position, Rect, Size},
    prelude::*,
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, BorderType, Borders, Paragraph},
    CompletedFrame, Frame, Terminal,
};

use crate::{
    app::{ClickableLine, Footer, Header, PreviewHeader, Status, Tab},
    colored_skip_take,
    common::path_to_string,
    config::{
        with_icon, with_icon_metadata, ColorG, FileStyle, Gradient, MenuStyle, FILE_STYLES,
        MATCHER, MENU_STYLES,
    },
    io::{read_last_log_line, DrawMenu, ImageAdapter, ImageDisplayer},
    log_info,
    modes::{
        highlighted_text, parse_input_permission, AnsiString, BinLine, BinaryContent, Content,
        ContentWindow, CursorOffset, Display as DisplayMode, DisplayedImage, FileInfo, FuzzyFinder,
        HLContent, Icon, Input, InputSimple, LineDisplay, Menu as MenuMode, MoreInfos, Navigate,
        NeedConfirmation, Preview, Remote, SecondLine, Selectable, TLine, TakeSkip, TakeSkipEnum,
        Text, TextKind, Trash, Tree,
    },
};

/// Common trait used to offset something by x & y.
pub trait Offseted {
    fn offseted(&self, x: u16, y: u16) -> Self;
}

impl Offseted for Rect {
    /// Returns a new rect moved by x horizontally and y vertically and constrained to the current rect.
    /// It won't draw outside of the original rect since it it also intersected by the original rect.
    fn offseted(&self, x: u16, y: u16) -> Self {
        self.offset(Offset {
            x: x as i32,
            y: y as i32,
        })
        .intersection(*self)
    }
}

/// Common trait all "window" should implement.
/// It's mostly used as an entry point for the rendering and should call another method.
trait Draw {
    /// Entry point for window rendering.
    fn draw(&self, f: &mut Frame, rect: &Rect);
}

macro_rules! colored_iter {
    ($t:ident, $s:ident) => {
        std::iter::zip(
            $t.iter(),
            Gradient::new(
                ColorG::from_ratatui($s.first.fg.unwrap_or(Color::Rgb(0, 0, 0)))
                    .unwrap_or_default(),
                ColorG::from_ratatui($s.palette_3.fg.unwrap_or(Color::Rgb(0, 0, 0)))
                    .unwrap_or_default(),
                $t.len(),
            )
            .gradient()
            .map(|color| Style::from(color)),
        )
    };
}

/// At least 120 chars width to display 2 tabs.
pub const MIN_WIDTH_FOR_DUAL_PANE: u16 = 120;

enum TabPosition {
    Left,
    Right,
}

/// Bunch of attributes describing the state of a main window
/// relatively to other windows
struct FilesAttributes {
    /// is this the left or right window ?
    tab_position: TabPosition,
    /// is this tab selected ?
    is_selected: bool,
    /// is there a menuary window ?
    has_window_below: bool,
}

impl FilesAttributes {
    fn new(tab_position: TabPosition, is_selected: bool, has_window_below: bool) -> Self {
        Self {
            tab_position,
            is_selected,
            has_window_below,
        }
    }

    fn is_right(&self) -> bool {
        matches!(self.tab_position, TabPosition::Right)
    }
}

struct FilesBuilder;

impl FilesBuilder {
    fn dual(status: &Status) -> (Files<'_>, Files<'_>) {
        let first_selected = status.focus.is_left();
        let menu_selected = !first_selected;
        let attributes_left = FilesAttributes::new(
            TabPosition::Left,
            first_selected,
            status.tabs[0].need_menu_window(),
        );
        let files_left = Files::new(status, 0, attributes_left);
        let attributes_right = FilesAttributes::new(
            TabPosition::Right,
            menu_selected,
            status.tabs[1].need_menu_window(),
        );
        let files_right = Files::new(status, 1, attributes_right);
        (files_left, files_right)
    }

    fn single(status: &Status) -> Files<'_> {
        let attributes_left =
            FilesAttributes::new(TabPosition::Left, true, status.tabs[0].need_menu_window());
        Files::new(status, 0, attributes_left)
    }
}

struct Files<'a> {
    status: &'a Status,
    tab: &'a Tab,
    attributes: FilesAttributes,
}

impl<'a> Files<'a> {
    fn draw(
        &self,
        f: &mut Frame,
        rect: &Rect,
        image_adapter: &mut ImageAdapter,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        let use_log_line = self.use_log_line();
        let rects = Rects::files(rect, use_log_line);

        if self.should_preview_in_right_tab() {
            self.preview_in_right_tab(
                f,
                &rects[0],
                &rects[2],
                image_adapter,
                menu_style,
                file_style,
            );
            return;
        }

        self.header(f, &rects[0]);
        self.copy_progress_bar(f, &rects[1], menu_style);
        self.second_line(f, &rects[1], file_style);
        self.content(
            f,
            &rects[1],
            &rects[2],
            image_adapter,
            menu_style,
            file_style,
        );
        if use_log_line {
            self.log_line(f, &rects[3], menu_style);
        }
        self.footer(f, rects.last().expect("Shouldn't be empty"));
    }
}

impl<'a> Files<'a> {
    fn new(status: &'a Status, index: usize, attributes: FilesAttributes) -> Self {
        Self {
            status,
            tab: &status.tabs[index],
            attributes,
        }
    }

    fn use_log_line(&self) -> bool {
        matches!(
            self.tab.display_mode,
            DisplayMode::Directory | DisplayMode::Tree
        ) && !self.attributes.has_window_below
            && !self.attributes.is_right()
    }

    fn should_preview_in_right_tab(&self) -> bool {
        self.status.session.dual() && self.is_right() && self.status.session.preview()
    }

    fn preview_in_right_tab(
        &self,
        f: &mut Frame,
        header_rect: &Rect,
        content_rect: &Rect,
        image_adapter: &mut ImageAdapter,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        let tab = &self.status.tabs[1];
        PreviewHeader::into_default_preview(self.status, tab, content_rect.width).draw_left(
            f,
            *header_rect,
            self.status.index == 1,
        );
        PreviewDisplay::new_with_args(self.status, tab, menu_style, file_style).draw(
            f,
            content_rect,
            image_adapter,
        );
    }

    fn is_right(&self) -> bool {
        self.attributes.is_right()
    }

    fn header(&self, f: &mut Frame, rect: &Rect) {
        FilesHeader::new(self.status, self.tab, self.attributes.is_selected).draw(f, rect);
    }

    /// Display a copy progress bar on the left tab.
    /// Nothing is drawn if there's no copy atm.
    /// If the copy file queue has length > 1, we also display its size.
    fn copy_progress_bar(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        if self.is_right() {
            return;
        }
        CopyProgressBar::new(self.status).draw(f, rect, menu_style);
    }

    fn second_line(&self, f: &mut Frame, rect: &Rect, file_style: &'static FileStyle) {
        if matches!(
            self.tab.display_mode,
            DisplayMode::Directory | DisplayMode::Tree
        ) {
            FilesSecondLine::new(self.status, self.tab, file_style).draw(f, rect);
        }
    }

    fn content(
        &self,
        f: &mut Frame,
        second_line_rect: &Rect,
        content_rect: &Rect,
        image_adapter: &mut ImageAdapter,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        match &self.tab.display_mode {
            DisplayMode::Directory => {
                DirectoryDisplay::new(self).draw(f, content_rect, menu_style, file_style)
            }
            DisplayMode::Tree => {
                TreeDisplay::new(self).draw(f, content_rect, menu_style, file_style)
            }
            DisplayMode::Preview => PreviewDisplay::new(self, menu_style, file_style).draw(
                f,
                content_rect,
                image_adapter,
            ),
            DisplayMode::Fuzzy => {
                FuzzyDisplay::new(self).fuzzy(f, second_line_rect, content_rect, menu_style)
            }
        }
    }

    fn log_line(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        LogLine.draw(f, rect, menu_style);
    }

    fn footer(&self, f: &mut Frame, rect: &Rect) {
        FilesFooter::new(self.status, self.tab, self.attributes.is_selected).draw(f, rect);
    }
}

struct CopyProgressBar<'a> {
    status: &'a Status,
}

impl<'a> CopyProgressBar<'a> {
    fn new(status: &'a Status) -> Self {
        Self { status }
    }

    fn draw(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let Some(content) = self.status.internal_settings.format_copy_progress() else {
            return;
        };
        let p_rect = rect.offseted(1, 0);
        Span::styled(&content, menu_style.palette_2).render(p_rect, f.buffer_mut());
    }
}

struct FuzzyDisplay<'a> {
    status: &'a Status,
}

impl<'a> FuzzyDisplay<'a> {
    fn new(files: &'a Files) -> Self {
        Self {
            status: files.status,
        }
    }

    fn fuzzy(
        &self,
        f: &mut Frame,
        second_line_rect: &Rect,
        content_rect: &Rect,
        menu_style: &'static MenuStyle,
    ) {
        let Some(fuzzy) = &self.status.fuzzy else {
            return;
        };
        let rects = Rects::fuzzy(content_rect);

        self.draw_prompt(fuzzy, f, second_line_rect, menu_style);
        self.draw_match_counts(fuzzy, f, &rects[0]);
        self.draw_matches(fuzzy, f, rects[1]);
    }

    /// Draw the matched items
    fn draw_match_counts(&self, fuzzy: &FuzzyFinder<String>, f: &mut Frame, rect: &Rect) {
        let match_info = self.line_match_info(fuzzy);
        let match_count_paragraph = Self::paragraph_match_count(match_info);
        f.render_widget(match_count_paragraph, *rect);
    }

    fn draw_prompt(
        &self,
        fuzzy: &FuzzyFinder<String>,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
    ) {
        // Render the prompt string at the bottom
        let input = fuzzy.input.string();
        let prompt_paragraph = Paragraph::new(vec![Line::from(vec![
            Span::styled("> ", menu_style.palette_3),
            Span::styled(input, menu_style.palette_2),
        ])])
        .block(Block::default().borders(Borders::NONE));

        f.render_widget(prompt_paragraph, *rect);
        self.set_cursor_position(f, rect, &fuzzy.input);
    }

    fn set_cursor_position(&self, f: &mut Frame, rect: &Rect, input: &Input) {
        // Move the cursor to the prompt
        f.set_cursor_position(Position {
            x: rect.x + input.index() as u16 + 2,
            y: rect.y,
        });
    }

    fn line_match_info(&self, fuzzy: &FuzzyFinder<String>) -> Line<'_> {
        Line::from(vec![
            Span::styled("  ", Style::default().fg(Color::Yellow)),
            Span::styled(
                format!("{}", fuzzy.matched_item_count),
                Style::default()
                    .fg(Color::Yellow)
                    .add_modifier(Modifier::ITALIC),
            ),
            Span::styled(" / ", Style::default().fg(Color::Yellow)),
            Span::styled(
                format!("{}", fuzzy.item_count),
                Style::default().fg(Color::Yellow),
            ),
            Span::raw(" "),
        ])
    }

    fn paragraph_match_count(match_info: Line) -> Paragraph {
        Paragraph::new(match_info)
            .style(Style::default())
            .right_aligned()
            .block(Block::default().borders(Borders::NONE))
    }

    fn draw_matches(&self, fuzzy: &FuzzyFinder<String>, f: &mut Frame, rect: Rect) {
        let snapshot = fuzzy.matcher.snapshot();
        let (top, bottom) = fuzzy.top_bottom();
        let mut indices = vec![];
        let mut matcher = MATCHER.lock();
        matcher.config = Config::DEFAULT;
        let is_file = fuzzy.kind.is_file();
        if is_file {
            matcher.config.set_match_paths();
        }
        snapshot
            .matched_items(top..bottom)
            .enumerate()
            .for_each(|(index, t)| {
                snapshot.pattern().column_pattern(0).indices(
                    t.matcher_columns[0].slice(..),
                    &mut matcher,
                    &mut indices,
                );
                let text = t.matcher_columns[0].to_string();
                let highlights_usize = Self::highlights_indices(&mut indices);
                let is_flagged = is_file
                    && self
                        .status
                        .menu
                        .flagged
                        .contains(std::path::Path::new(&text));

                let line = highlighted_text(
                    &text,
                    &highlights_usize,
                    index as u32 + top == fuzzy.index,
                    is_file,
                    is_flagged,
                );
                let line_rect = Self::line_rect(rect, index);
                line.render(line_rect, f.buffer_mut());
            });
    }

    fn highlights_indices(indices: &mut Vec<u32>) -> Vec<usize> {
        indices.sort_unstable();
        indices.dedup();
        let highlights = indices.drain(..);
        highlights.map(|index| index as usize).collect()
    }

    fn line_rect(rect: Rect, index: usize) -> Rect {
        let mut line_rect = rect;
        line_rect.y += index as u16;
        line_rect
    }
}

struct DirectoryDisplay<'a> {
    status: &'a Status,
    tab: &'a Tab,
    group_owner_sizes: (usize, usize),
}

impl<'a> DirectoryDisplay<'a> {
    fn new(files: &'a Files) -> Self {
        let group_owner_sizes = Self::group_owner_size(files.status, files.tab);
        Self {
            status: files.status,
            tab: files.tab,
            group_owner_sizes,
        }
    }

    fn draw(
        &self,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        self.files(f, rect, menu_style, file_style)
    }

    /// Displays the current directory content, one line per item like in
    /// `ls -l`.
    ///
    /// Only the files around the selected one are displayed.
    /// We reverse the attributes of the selected one, underline the flagged files.
    /// When we display a simpler version, the menu line is used to display the
    /// metadata of the selected file.
    fn files(
        &self,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        let p_rect = rect.offseted(0, 0);
        let formater = Self::pick_formater(self.status.session.metadata(), p_rect.width);
        let with_icon = with_icon();
        let lines: Vec<_> = self
            .tab
            .dir_enum_skip_take()
            .map(|(index, file)| {
                self.files_line(index, file, &formater, with_icon, menu_style, file_style)
            })
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    fn pick_formater(with_metadata: bool, width: u16) -> Formater {
        let kind = FormatKind::from_flags(with_metadata, width);

        match kind {
            FormatKind::Metadata => FileFormater::metadata,
            FormatKind::MetadataNoGroup => FileFormater::metadata_no_group,
            FormatKind::MetadataNoPermissions => FileFormater::metadata_no_permissions,
            FormatKind::MetadataNoOwner => FileFormater::metadata_no_owner,
            FormatKind::Simple => FileFormater::simple,
        }
    }

    fn group_owner_size(status: &Status, tab: &Tab) -> (usize, usize) {
        if status.session.metadata() {
            (
                tab.directory.group_column_width(),
                tab.directory.owner_column_width(),
            )
        } else {
            (0, 0)
        }
    }

    fn files_line<'b>(
        &self,
        index: usize,
        file: &FileInfo,
        formater: &fn(&FileInfo, (usize, usize)) -> String,
        with_icon: bool,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) -> Line<'b> {
        let mut style = file.style(file_style);
        self.reverse_selected(index, &mut style);
        self.color_searched(file, &mut style, menu_style);
        let mut content = formater(file, self.group_owner_sizes);

        content.push(' ');
        if with_icon {
            content.push_str(file.icon());
        }
        content.push_str(&file.filename);
        if file.is_symlink() {
            file.expand_symlink(&mut content);
        }

        Line::from(vec![
            self.span_flagged_symbol(file, &mut style, menu_style),
            Self::mark_span(self.status, file, menu_style),
            Span::styled(content, style),
        ])
    }

    fn mark_span<'b>(status: &Status, file: &FileInfo, menu_style: &'static MenuStyle) -> Span<'b> {
        if let Some(index) = status.menu.temp_marks.digit_for(&file.path) {
            Span::styled(index.to_string(), menu_style.palette_1)
        } else {
            let first_char = status.menu.marks.char_for(&file.path);
            Span::styled(String::from(*first_char), menu_style.palette_2)
        }
    }

    fn reverse_selected(&self, index: usize, style: &mut Style) {
        if index == self.tab.directory.index {
            style.add_modifier |= Modifier::REVERSED;
        }
    }

    fn color_searched(&self, file: &FileInfo, style: &mut Style, menu_style: &'static MenuStyle) {
        if self.tab.search.is_match(&file.filename) {
            style.fg = menu_style.palette_4.fg;
        }
    }

    fn span_flagged_symbol<'b>(
        &self,
        file: &FileInfo,
        style: &mut Style,
        menu_style: &'static MenuStyle,
    ) -> Span<'b> {
        if self.status.menu.flagged.contains(&file.path) {
            style.add_modifier |= Modifier::BOLD;
            Span::styled("█", menu_style.second)
        } else {
            Span::raw("")
        }
    }
}

type Formater = fn(&FileInfo, (usize, usize)) -> String;

struct FileFormater;

impl FileFormater {
    fn metadata(file: &FileInfo, owner_sizes: (usize, usize)) -> String {
        file.format_base(owner_sizes.1, owner_sizes.0)
    }

    fn metadata_no_group(file: &FileInfo, owner_sizes: (usize, usize)) -> String {
        file.format_no_group(owner_sizes.1)
    }

    fn metadata_no_permissions(file: &FileInfo, owner_sizes: (usize, usize)) -> String {
        file.format_no_permissions(owner_sizes.1)
    }

    fn metadata_no_owner(file: &FileInfo, _owner_sizes: (usize, usize)) -> String {
        file.format_no_owner()
    }

    fn simple(_file: &FileInfo, _owner_sizes: (usize, usize)) -> String {
        " ".to_owned()
    }
}

#[derive(Debug)]
enum FormatKind {
    Metadata,
    MetadataNoGroup,
    MetadataNoPermissions,
    MetadataNoOwner,
    Simple,
}

impl FormatKind {
    #[rustfmt::skip]
    fn from_flags(
        with_metadata: bool,
        width: u16,
    ) -> Self {
        let wide_enough_for_group = width > 70;
        let wide_enough_for_metadata = width > 50;
        let wide_enough_for_permissions = width > 40;
        let wide_enough_for_owner = width > 30;

        match (
            with_metadata,
            wide_enough_for_group,
            wide_enough_for_metadata,
            wide_enough_for_permissions,
            wide_enough_for_owner,
        ) {
            (true, true,  _,    _,       _)     => Self::Metadata,
            (true, false, true, _,       _)     => Self::MetadataNoGroup,
            (true, _,     _,    true,    _)     => Self::MetadataNoPermissions,
            (true, _,     _,    _,    true)     => Self::MetadataNoOwner,
            _ => Self::Simple,
        }
    }
}

struct TreeDisplay<'a> {
    status: &'a Status,
    tab: &'a Tab,
}

impl<'a> TreeDisplay<'a> {
    fn new(files: &'a Files) -> Self {
        Self {
            status: files.status,
            tab: files.tab,
        }
    }

    fn draw(
        &self,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        self.tree(f, rect, menu_style, file_style)
    }

    fn tree(
        &self,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        let paragraph = Self::tree_paragraph(
            self.status,
            &self.tab.tree,
            &self.tab.window,
            self.status.session.metadata(),
            rect,
            menu_style,
            file_style,
        );
        Self::render(paragraph, f, rect)
    }

    fn render(paragraph: Paragraph, f: &mut Frame, rect: &Rect) {
        paragraph.render(*rect, f.buffer_mut());
    }

    fn tree_paragraph<'b>(
        status: &'b Status,
        tree: &'b Tree,
        window: &'b ContentWindow,
        with_metadata: bool,
        rect: &'b Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) -> Paragraph<'b> {
        let p_rect = rect.offseted(0, 0);
        let width = p_rect.width.saturating_sub(6);
        let formater = DirectoryDisplay::pick_formater(with_metadata, width);
        let with_icon = Self::use_icon(with_metadata);
        Paragraph::new(
            tree.lines_enum_skip_take(window)
                .filter_map(|(index, line_builder)| {
                    Self::tree_line(
                        status,
                        index == 0,
                        line_builder,
                        &formater,
                        with_icon,
                        menu_style,
                        file_style,
                    )
                    .ok()
                })
                .collect::<Vec<_>>(),
        )
    }

    fn use_icon(with_metadata: bool) -> bool {
        (!with_metadata && with_icon()) || with_icon_metadata()
    }

    fn tree_line<'b>(
        status: &Status,
        with_offset: bool,
        line_builder: &'b TLine,
        formater: &Formater,
        with_icon: bool,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) -> Result<Line<'b>> {
        let path = line_builder.path();
        let fileinfo = FileInfo::new(&line_builder.path, &status.tabs[0].users)?;
        let mut style = fileinfo.style(file_style);
        Self::reverse_flagged(line_builder, &mut style);
        Self::color_searched(status, &fileinfo, &mut style, menu_style);
        Ok(Line::from(vec![
            Self::span_flagged_symbol(status, path, &mut style, menu_style),
            DirectoryDisplay::mark_span(status, &fileinfo, menu_style),
            Self::metadata(&fileinfo, formater, style),
            Self::prefix(line_builder),
            Self::whitespaces(status, path, with_offset),
            Self::filename(line_builder, with_icon, style),
        ]))
    }

    fn reverse_flagged(line_builder: &TLine, style: &mut Style) {
        if line_builder.is_selected {
            style.add_modifier |= Modifier::REVERSED;
        }
    }

    fn color_searched(
        status: &Status,
        file: &FileInfo,
        style: &mut Style,
        menu_style: &'static MenuStyle,
    ) {
        if status.current_tab().search.is_match(&file.filename) {
            style.fg = menu_style.palette_4.fg;
        }
    }

    fn span_flagged_symbol<'b>(
        status: &Status,
        path: &std::path::Path,
        style: &mut Style,
        menu_style: &'static MenuStyle,
    ) -> Span<'b> {
        if status.menu.flagged.contains(path) {
            style.add_modifier |= Modifier::BOLD;
            Span::styled("█", menu_style.second)
        } else {
            Span::raw(" ")
        }
    }

    fn metadata<'b>(fileinfo: &FileInfo, formater: &Formater, style: Style) -> Span<'b> {
        Span::styled(formater(fileinfo, (6, 6)), style)
    }

    fn prefix(line_builder: &TLine) -> Span<'_> {
        Span::raw(line_builder.prefix())
    }

    fn whitespaces<'b>(status: &Status, path: &std::path::Path, with_offset: bool) -> Span<'b> {
        Span::raw(" ".repeat(status.menu.flagged.contains(path) as usize + with_offset as usize))
    }

    fn filename<'b>(line_builder: &TLine, with_icon: bool, style: Style) -> Span<'b> {
        Span::styled(line_builder.filename(with_icon), style)
    }
}

struct PreviewDisplay<'a> {
    status: &'a Status,
    tab: &'a Tab,
    menu_style: &'static MenuStyle,
    file_style: &'static FileStyle,
}

/// Display a scrollable preview of a file.
/// Multiple modes are supported :
/// if the filename extension is recognized, the preview is highlighted,
/// if the file content is recognized as binary, an hex dump is previewed with 16 bytes lines,
/// else the content is supposed to be text and shown as such.
/// It may fail to recognize some usual extensions, notably `.toml`.
/// It may fail to recognize small files (< 1024 bytes).
impl<'a> PreviewDisplay<'a> {
    fn new(
        files: &'a Files,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) -> Self {
        Self {
            status: files.status,
            tab: files.tab,
            menu_style,
            file_style,
        }
    }

    fn new_with_args(
        status: &'a Status,
        tab: &'a Tab,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) -> Self {
        Self {
            status,
            tab,
            menu_style,
            file_style,
        }
    }

    fn draw(&self, f: &mut Frame, rect: &Rect, image_adapter: &mut ImageAdapter) {
        self.preview(f, rect, image_adapter)
    }

    fn preview(&self, f: &mut Frame, rect: &Rect, image_adapter: &mut ImageAdapter) {
        let tab = self.tab;
        let window = &tab.window;
        let length = tab.preview.len();
        match &tab.preview {
            Preview::Syntaxed(syntaxed) => {
                let number_col_width = Self::number_width(length);
                self.syntaxed(f, syntaxed, length, rect, number_col_width, window)
            }
            Preview::Binary(bin) => self.binary(f, bin, length, rect, window, self.menu_style),
            Preview::Image(image) => self.image(image, rect, image_adapter),
            Preview::Tree(tree_preview) => self.tree_preview(f, tree_preview, window, rect),
            Preview::Text(ansi_text)
                if matches!(ansi_text.kind, TextKind::CommandStdout | TextKind::Plugin) =>
            {
                self.ansi_text(f, ansi_text, length, rect, window)
            }
            Preview::Text(text) => self.normal_text(f, text, length, rect, window),

            Preview::Empty => (),
        };
    }

    fn line_number_span<'b>(
        line_number_to_print: &usize,
        number_col_width: usize,
        style: Style,
    ) -> Span<'b> {
        Span::styled(
            format!("{line_number_to_print:>number_col_width$}  "),
            style,
        )
    }

    /// Number of digits in decimal representation
    fn number_width(mut number: usize) -> usize {
        let mut width = 0;
        while number != 0 {
            width += 1;
            number /= 10;
        }
        width
    }

    /// Draw every line of the text
    fn normal_text(
        &self,
        f: &mut Frame,
        text: &Text,
        length: usize,
        rect: &Rect,
        window: &ContentWindow,
    ) {
        let p_rect = rect.offseted(2, 0);
        let lines: Vec<_> = text
            .take_skip(window.top, window.bottom, length)
            .map(Line::raw)
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    fn syntaxed(
        &self,
        f: &mut Frame,
        syntaxed: &HLContent,
        length: usize,
        rect: &Rect,
        number_col_width: usize,
        window: &ContentWindow,
    ) {
        let p_rect = rect.offseted(3, 0);
        let number_col_style = self.menu_style.first;
        let lines: Vec<_> = syntaxed
            .take_skip_enum(window.top, window.bottom, length)
            .map(|(index, vec_line)| {
                let mut line = vec![Self::line_number_span(
                    &index,
                    number_col_width,
                    number_col_style,
                )];
                line.append(
                    &mut vec_line
                        .iter()
                        .map(|token| Span::styled(&token.content, token.style))
                        .collect::<Vec<_>>(),
                );
                Line::from(line)
            })
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    fn binary(
        &self,
        f: &mut Frame,
        bin: &BinaryContent,
        length: usize,
        rect: &Rect,
        window: &ContentWindow,
        menu_style: &'static MenuStyle,
    ) {
        let p_rect = rect.offseted(3, 0);
        let line_number_width_hex = bin.number_width_hex();
        let (style_number, style_ascii) = { (menu_style.first, menu_style.second) };
        let lines: Vec<_> = (*bin)
            .take_skip_enum(window.top, window.bottom, length)
            .map(|(index, bin_line)| {
                Line::from(vec![
                    Span::styled(
                        BinLine::format_line_nr_hex(index + 1 + window.top, line_number_width_hex),
                        style_number,
                    ),
                    Span::raw(bin_line.format_hex()),
                    Span::raw(" "),
                    Span::styled(bin_line.format_as_ascii(), style_ascii),
                ])
            })
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    /// Draw the image with correct adapter in the current window.
    /// The position is absolute, which is problematic when the app is embeded into a floating terminal.
    fn image(&self, image: &DisplayedImage, rect: &Rect, image_adapter: &mut ImageAdapter) {
        if let Err(e) = image_adapter.draw(image, *rect) {
            log_info!("Couldn't display {path}: {e:?}", path = image.identifier);
        }
    }

    fn tree_preview(&self, f: &mut Frame, tree: &Tree, window: &ContentWindow, rect: &Rect) {
        let paragraph = TreeDisplay::tree_paragraph(
            self.status,
            tree,
            window,
            false,
            rect,
            self.menu_style,
            self.file_style,
        );
        TreeDisplay::render(paragraph, f, rect)
    }

    fn ansi_text(
        &self,
        f: &mut Frame,
        ansi_text: &Text,
        length: usize,
        rect: &Rect,
        window: &ContentWindow,
    ) {
        let p_rect = rect.offseted(3, 0);
        let lines: Vec<_> = ansi_text
            .take_skip(window.top, window.bottom, length)
            .map(|line| {
                Line::from(
                    AnsiString::parse(line)
                        .iter()
                        .map(|(chr, style)| Span::styled(chr.to_string(), style))
                        .collect::<Vec<_>>(),
                )
            })
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }
}

struct FilesHeader<'a> {
    status: &'a Status,
    tab: &'a Tab,
    is_selected: bool,
}

impl<'a> Draw for FilesHeader<'a> {
    /// Display the top line on terminal.
    /// Its content depends on the mode.
    /// In normal mode we display the path and number of files.
    /// something else.
    /// The colors are reversed when the tab is selected. It gives a visual indication of where he is.
    fn draw(&self, f: &mut Frame, rect: &Rect) {
        let width = rect.width;
        let header: Box<dyn ClickableLine> = match self.tab.display_mode {
            DisplayMode::Preview => Box::new(PreviewHeader::new(self.status, self.tab, width)),
            _ => Box::new(Header::new(self.status, self.tab).expect("Couldn't build header")),
        };
        header.draw_left(f, *rect, self.is_selected);
        header.draw_right(f, *rect, self.is_selected);
    }
}

impl<'a> FilesHeader<'a> {
    fn new(status: &'a Status, tab: &'a Tab, is_selected: bool) -> Self {
        Self {
            status,
            tab,
            is_selected,
        }
    }
}

#[derive(Default)]
struct FilesSecondLine {
    content: Option<String>,
    style: Option<Style>,
}

impl Draw for FilesSecondLine {
    fn draw(&self, f: &mut Frame, rect: &Rect) {
        let p_rect = rect.offseted(1, 0);
        if let (Some(content), Some(style)) = (&self.content, &self.style) {
            Span::styled(content, *style).render(p_rect, f.buffer_mut());
        };
    }
}

impl FilesSecondLine {
    fn new(status: &Status, tab: &Tab, file_style: &'static FileStyle) -> Self {
        if tab.display_mode.is_preview() || status.session.metadata() {
            return Self::default();
        };
        if let Ok(file) = tab.current_file() {
            Self::second_line_detailed(&file, file_style)
        } else {
            Self::default()
        }
    }

    fn second_line_detailed(file: &FileInfo, file_style: &'static FileStyle) -> Self {
        let owner_size = file.owner.len();
        let group_size = file.group.len();
        let mut style = file.style(file_style);
        style.add_modifier ^= Modifier::REVERSED;

        Self {
            content: Some(file.format_metadata(owner_size, group_size)),
            style: Some(style),
        }
    }
}

struct LogLine;

impl LogLine {
    fn draw(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let p_rect = rect.offseted(4, 0);
        let log = &read_last_log_line();
        Span::styled(log, menu_style.second).render(p_rect, f.buffer_mut());
    }
}

struct FilesFooter<'a> {
    status: &'a Status,
    tab: &'a Tab,
    is_selected: bool,
}

impl<'a> Draw for FilesFooter<'a> {
    /// Display the top line on terminal.
    /// Its content depends on the mode.
    /// In normal mode we display the path and number of files.
    /// When a confirmation is needed we ask the user to input `'y'` or
    /// something else.
    /// Returns the result of the number of printed chars.
    /// The colors are reversed when the tab is selected. It gives a visual indication of where he is.
    fn draw(&self, f: &mut Frame, rect: &Rect) {
        match self.tab.display_mode {
            DisplayMode::Preview => (),
            _ => {
                let Ok(footer) = Footer::new(self.status, self.tab) else {
                    return;
                };
                // let p_rect = rect.offseted(0, rect.height.saturating_sub(1));
                footer.draw_left(f, *rect, self.is_selected);
            }
        }
    }
}

impl<'a> FilesFooter<'a> {
    fn new(status: &'a Status, tab: &'a Tab, is_selected: bool) -> Self {
        Self {
            status,
            tab,
            is_selected,
        }
    }
}

struct Menu<'a> {
    status: &'a Status,
    tab: &'a Tab,
}

impl<'a> Menu<'a> {
    fn new(status: &'a Status, index: usize) -> Self {
        Self {
            status,
            tab: &status.tabs[index],
        }
    }

    fn draw(
        &self,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        if !self.tab.need_menu_window() {
            return;
        }
        let mode = self.tab.menu_mode;
        self.cursor(f, rect);
        MenuFirstLine::new(self.status, rect).draw(f, rect, menu_style);
        self.menu_line(f, rect, menu_style);
        self.content_per_mode(f, rect, mode, menu_style, file_style);
        self.binds_per_mode(f, rect, mode, menu_style);
    }

    /// Render a generic content of elements which are references to str.
    /// It creates a new rect, offseted by `x, y` and intersected with rect.
    /// Each element of content is wraped by a styled span (with his own style) and then wrapped by a line.
    /// The iteration only take enough element to be displayed in the rect.
    /// Then we create a paragraph with default parameters and render it.
    fn render_content<T>(
        content: &[T],
        f: &mut Frame,
        rect: &Rect,
        x: u16,
        y: u16,
        menu_style: &'static MenuStyle,
    ) where
        T: AsRef<str>,
    {
        let p_rect = rect.offseted(x, y);
        let lines: Vec<_> = colored_iter!(content, menu_style)
            .map(|(text, style)| Line::from(vec![Span::styled(text.as_ref(), style)]))
            .take(p_rect.height as usize + 2)
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    /// Hide the cursor if the current mode doesn't require one.
    /// Otherwise, display a cursor in the top row, at a correct column.
    ///
    /// # Errors
    ///
    /// may fail if we can't display on the terminal.
    fn cursor(&self, f: &mut Frame, rect: &Rect) {
        if self.tab.menu_mode.show_cursor() {
            let offset = self.tab.menu_mode.cursor_offset();
            let avail = rect.width.saturating_sub(offset + 1) as usize;
            let cursor_index = self.status.menu.input.display_index(avail) as u16;
            let x = rect.x + offset + cursor_index;
            f.set_cursor_position(Position::new(x, rect.y));
        }
    }

    fn menu_line(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let menu = menu_style.second;
        match self.tab.menu_mode {
            MenuMode::InputSimple(InputSimple::Chmod) => {
                let first = menu_style.first;
                self.menu_line_chmod(f, rect, first, menu);
            }
            MenuMode::InputSimple(InputSimple::Remote) => {
                let palette_3 = menu_style.palette_3;
                self.menu_line_remote(f, rect, palette_3);
            }
            edit => {
                let rect = rect.offseted(2, 1);
                Span::styled(edit.second_line(), menu).render(rect, f.buffer_mut());
            }
        };
    }

    fn menu_line_chmod(&self, f: &mut Frame, rect: &Rect, first: Style, menu: Style) {
        let input = self.status.menu.input.string();
        let (text, is_valid) = parse_input_permission(&input);
        let style = if is_valid { first } else { menu };
        let p_rect = rect.offseted(11, 1);
        Line::styled(text.as_ref(), style).render(p_rect, f.buffer_mut());
    }

    fn menu_line_remote(&self, f: &mut Frame, rect: &Rect, first: Style) {
        let input = self.status.menu.input.string();
        let current_path = path_to_string(&self.tab.current_directory_path());

        if let Some(remote) = Remote::from_input(input, &current_path) {
            let command = format!("{command:?}", command = remote.command());
            let p_rect = rect.offseted(4, 8);
            Line::styled(command, first).render(p_rect, f.buffer_mut());
        };
    }

    fn content_per_mode(
        &self,
        f: &mut Frame,
        rect: &Rect,
        mode: MenuMode,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        match mode {
            MenuMode::Navigate(mode) => self.navigate(mode, f, rect, menu_style, file_style),
            MenuMode::NeedConfirmation(mode) => self.confirm(mode, f, rect, menu_style),
            MenuMode::InputCompleted(_) => self.completion(f, rect),
            MenuMode::InputSimple(mode) => Self::input_simple(mode.lines(), f, rect, menu_style),
            _ => (),
        }
    }

    fn binds_per_mode(
        &self,
        f: &mut Frame,
        rect: &Rect,
        mode: MenuMode,
        menu_style: &'static MenuStyle,
    ) {
        if mode == MenuMode::Navigate(Navigate::Trash) {
            return;
        }
        let p_rect = rect.offseted(2, rect.height.saturating_sub(2));
        Span::styled(mode.binds_per_mode(), menu_style.second).render(p_rect, f.buffer_mut());
    }

    fn input_simple(lines: &[&str], f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let mut p_rect = rect.offseted(4, ContentWindow::WINDOW_MARGIN_TOP_U16);
        p_rect.height = p_rect.height.saturating_sub(2);
        Self::render_content(lines, f, &p_rect, 0, 0, menu_style);
    }

    fn navigate(
        &self,
        navigate: Navigate,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
        file_style: &'static FileStyle,
    ) {
        if navigate.simple_draw_menu() {
            return self.status.menu.draw_navigate(f, rect, navigate);
        }
        match navigate {
            Navigate::Cloud => self.cloud(f, rect, menu_style),
            Navigate::Context => self.context(f, rect, menu_style),
            Navigate::TempMarks(_) => self.temp_marks(f, rect),
            Navigate::Flagged => self.flagged(f, rect, file_style),
            Navigate::History => self.history(f, rect),
            Navigate::Picker => self.picker(f, rect, menu_style),
            Navigate::Trash => self.trash(f, rect, menu_style),
            _ => unreachable!("menu.simple_draw_menu should cover this mode"),
        }
    }

    fn history(&self, f: &mut Frame, rect: &Rect) {
        let selectable = &self.tab.history;
        let mut window = ContentWindow::new(selectable.len(), rect.height as usize);
        window.scroll_to(selectable.index);
        selectable.draw_menu(f, rect, &window)
    }

    fn trash(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let trash = &self.status.menu.trash;
        if trash.content().is_empty() {
            self.trash_is_empty(f, rect, menu_style)
        } else {
            self.trash_content(f, rect, trash, menu_style)
        };
    }

    fn trash_content(
        &self,
        f: &mut Frame,
        rect: &Rect,
        trash: &Trash,
        menu_style: &'static MenuStyle,
    ) {
        trash.draw_menu(f, rect, &self.status.menu.window);

        let p_rect = rect.offseted(2, rect.height.saturating_sub(2));
        Span::styled(&trash.help, menu_style.second).render(p_rect, f.buffer_mut());
    }

    fn trash_is_empty(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        Self::content_line(f, rect, 0, "Trash is empty", menu_style.second);
    }

    fn cloud(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let cloud = &self.status.menu.cloud;
        let mut desc = cloud.desc();
        if let Some((index, metadata)) = &cloud.metadata_repr {
            if index == &cloud.index {
                desc = format!("{desc} - {metadata}");
            }
        }
        let p_rect = rect.offseted(2, 2);
        Span::styled(desc, menu_style.palette_4).render(p_rect, f.buffer_mut());
        cloud.draw_menu(f, rect, &self.status.menu.window)
    }

    fn picker(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let selectable = &self.status.menu.picker;
        selectable.draw_menu(f, rect, &self.status.menu.window);
        if let Some(desc) = &selectable.desc {
            let p_rect = rect.offseted(10, 0);
            Span::styled(desc, menu_style.first).render(p_rect, f.buffer_mut());
        }
    }

    fn temp_marks(&self, f: &mut Frame, rect: &Rect) {
        let selectable = &self.status.menu.temp_marks;
        selectable.draw_menu(f, rect, &self.status.menu.window);
    }

    fn context(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let moved_rect_up = rect.offset(Offset { x: 0, y: -1 });
        self.context_selectable(f, &moved_rect_up);
        self.context_more_infos(f, &moved_rect_up, menu_style)
    }

    fn context_selectable(&self, f: &mut Frame, rect: &Rect) {
        self.status
            .menu
            .context
            .draw_menu(f, rect, &self.status.menu.window);
    }

    fn context_more_infos(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let Ok(file_info) = &self.tab.current_file() else {
            return;
        };
        let space_used = self.status.menu.context.content.len() as u16;
        let lines = MoreInfos::new(file_info, &self.status.internal_settings.opener).to_lines();
        let more_infos: Vec<&String> = lines.iter().filter(|line| !line.is_empty()).collect();
        Self::render_content(&more_infos, f, rect, 4, 3 + space_used, menu_style);
    }

    fn flagged(&self, f: &mut Frame, rect: &Rect, file_style: &'static FileStyle) {
        self.flagged_files(f, rect);
        self.flagged_selected(f, rect, file_style);
    }

    fn flagged_files(&self, f: &mut Frame, rect: &Rect) {
        self.status
            .menu
            .flagged
            .draw_menu(f, rect, &self.status.menu.window);
    }

    fn flagged_selected(&self, f: &mut Frame, rect: &Rect, file_style: &'static FileStyle) {
        if let Some(selected) = self.status.menu.flagged.selected() {
            let Ok(fileinfo) = FileInfo::new(selected, &self.tab.users) else {
                return;
            };
            let p_rect = rect.offseted(2, 2);
            Span::styled(fileinfo.format_metadata(6, 6), fileinfo.style(file_style))
                .render(p_rect, f.buffer_mut());
        };
    }

    /// Display the possible completion items. The currently selected one is
    /// reversed.
    fn completion(&self, f: &mut Frame, rect: &Rect) {
        self.status
            .menu
            .completion
            .draw_menu(f, rect, &self.status.menu.window)
    }

    /// Display a list of edited (deleted, copied, moved, trashed) files for confirmation
    fn confirm(
        &self,
        confirmed_mode: NeedConfirmation,
        f: &mut Frame,
        rect: &Rect,
        menu_style: &'static MenuStyle,
    ) {
        let dest = path_to_string(
            &self
                .tab
                .directory_of_selected()
                .unwrap_or_else(|_| std::path::Path::new("")),
        );

        Self::content_line(
            f,
            rect,
            0,
            &confirmed_mode.confirmation_string(&dest),
            menu_style.second,
        );
        match confirmed_mode {
            NeedConfirmation::EmptyTrash => self.confirm_empty_trash(f, rect, menu_style),
            NeedConfirmation::BulkAction => self.confirm_bulk(f, rect),
            NeedConfirmation::DeleteCloud => self.confirm_delete_cloud(f, rect, menu_style),
            _ => self.confirm_default(f, rect),
        };
    }

    fn confirm_default(&self, f: &mut Frame, rect: &Rect) {
        self.status
            .menu
            .flagged
            .draw_menu(f, rect, &self.status.menu.window);
    }

    fn confirm_bulk(&self, f: &mut Frame, rect: &Rect) {
        let content = self.status.menu.bulk.format_confirmation();

        let mut p_rect = rect.offseted(4, 3);
        p_rect.height = p_rect.height.saturating_sub(2);
        // let content = self.content();
        let window = &self.status.menu.window;
        use std::cmp::min;
        let lines: Vec<_> = colored_skip_take!(content, window)
            .map(|(index, item, style)| {
                Line::styled(item, self.status.menu.bulk.style(index, &style))
            })
            .collect();
        Paragraph::new(lines).render(p_rect, f.buffer_mut());
    }

    fn confirm_delete_cloud(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let line = if let Some(selected) = &self.status.menu.cloud.selected() {
            &format!(
                "{desc}{sel}",
                desc = self.status.menu.cloud.desc(),
                sel = selected.path()
            )
        } else {
            "No selected file"
        };
        Self::content_line(f, rect, 3, line, menu_style.palette_4);
    }

    fn confirm_empty_trash(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        if self.status.menu.trash.is_empty() {
            self.trash_is_empty(f, rect, menu_style)
        } else {
            self.confirm_non_empty_trash(f, rect)
        }
    }

    fn confirm_non_empty_trash(&self, f: &mut Frame, rect: &Rect) {
        self.status
            .menu
            .trash
            .draw_menu(f, rect, &self.status.menu.window);
    }

    fn content_line(f: &mut Frame, rect: &Rect, row: u16, text: &str, style: Style) {
        let p_rect = rect.offseted(4, row + ContentWindow::WINDOW_MARGIN_TOP_U16);
        Span::styled(text, style).render(p_rect, f.buffer_mut());
    }
}

/// First line of every menu. This is where inputs are shown.
/// For most of the menus, it's their name, some spaces and the input typed by the user.
pub struct MenuFirstLine {
    content: Vec<String>,
}

impl MenuFirstLine {
    /// Number of spaces between rect border and first char of the line.
    pub const LEFT_MARGIN: u16 = 2;

    fn new(status: &Status, rect: &Rect) -> Self {
        Self {
            content: status.current_tab().menu_mode.line_display(status, rect),
        }
    }

    fn draw(&self, f: &mut Frame, rect: &Rect, menu_style: &'static MenuStyle) {
        let spans: Vec<_> =
            std::iter::zip(self.content.iter(), menu_style.palette().iter().cycle())
                .map(|(text, style)| Span::styled(text, *style))
                .collect();
        let p_rect = rect.offseted(Self::LEFT_MARGIN, 0);
        Line::from(spans).render(p_rect, f.buffer_mut());
    }
}

/// Methods used to create the various rects
struct Rects;

impl Rects {
    const FILES_WITH_LOGLINE: &[Constraint] = &[
        Constraint::Length(1),
        Constraint::Length(1),
        Constraint::Fill(1),
        Constraint::Length(1),
        Constraint::Length(1),
    ];

    const FILES_WITHOUT_LOGLINE: &[Constraint] = &[
        Constraint::Length(1),
        Constraint::Length(1),
        Constraint::Fill(1),
        Constraint::Length(1),
    ];

    /// Main rect of the application
    fn full_rect(width: u16, height: u16) -> Rect {
        Rect::new(0, 0, width, height)
    }

    /// Main rect but inside its border
    fn inside_border_rect(width: u16, height: u16) -> Rect {
        Rect::new(1, 1, width.saturating_sub(2), height.saturating_sub(2))
    }

    /// Horizontal split the inside rect in two
    fn left_right_inside_rects(rect: Rect) -> Rc<[Rect]> {
        Layout::new(
            Direction::Horizontal,
            [Constraint::Min(rect.width / 2), Constraint::Fill(1)],
        )
        .split(rect)
    }

    /// Bordered rects of the four windows
    fn dual_bordered_rect(
        parent_wins: Rc<[Rect]>,
        have_menu_left: bool,
        have_menu_right: bool,
    ) -> Vec<Rect> {
        let mut bordered_wins =
            Self::vertical_split_border(parent_wins[0], have_menu_left).to_vec();
        bordered_wins
            .append(&mut Self::vertical_split_border(parent_wins[1], have_menu_right).to_vec());
        bordered_wins
    }

    /// Inside rects of the four windows.
    fn dual_inside_rect(rect: Rect, have_menu_left: bool, have_menu_right: bool) -> Vec<Rect> {
        let left_right = Self::left_right_rects(rect);
        let mut areas = Self::vertical_split_inner(left_right[0], have_menu_left).to_vec();
        areas.append(&mut Self::vertical_split_inner(left_right[2], have_menu_right).to_vec());
        areas
    }

    /// Main inside rect for left and right.
    /// It also returns a padding rect which should be ignored by the caller.
    fn left_right_rects(rect: Rect) -> Rc<[Rect]> {
        Layout::new(
            Direction::Horizontal,
            [
                Constraint::Min(rect.width / 2 - 1),
                Constraint::Max(2),
                Constraint::Min(rect.width / 2 - 2),
            ],
        )
        .split(rect)
    }

    /// Vertical split used to split the inside windows of a pane, left or right.
    /// It also recturns a padding rect which should be ignored by the caller.
    fn vertical_split_inner(parent_win: Rect, have_menu: bool) -> Rc<[Rect]> {
        if have_menu {
            Layout::new(
                Direction::Vertical,
                [
                    Constraint::Min(parent_win.height / 2 - 1),
                    Constraint::Max(2),
                    Constraint::Fill(1),
                ],
            )
            .split(parent_win)
        } else {
            Rc::new([parent_win, Rect::default(), Rect::default()])
        }
    }

    /// Vertical split used to create the bordered rects of a pane, left or right.
    fn vertical_split_border(parent_win: Rect, have_menu: bool) -> Rc<[Rect]> {
        let percent = if have_menu { 50 } else { 100 };
        Layout::new(
            Direction::Vertical,
            [Constraint::Percentage(percent), Constraint::Fill(1)],
        )
        .split(parent_win)
    }

    /// Split the rect vertically like this:
    /// 1   :       header
    /// 1   :       copy progress bar or second line
    /// fill:       content
    /// 1   :       log line
    /// 1   :       footer
    fn files(rect: &Rect, use_log_line: bool) -> Rc<[Rect]> {
        Layout::new(
            Direction::Vertical,
            if use_log_line {
                Self::FILES_WITH_LOGLINE
            } else {
                Self::FILES_WITHOUT_LOGLINE
            },
        )
        .split(*rect)
    }

    fn fuzzy(area: &Rect) -> Rc<[Rect]> {
        Layout::default()
            .direction(Direction::Vertical)
            .constraints([Constraint::Length(1), Constraint::Min(0)])
            .split(*area)
    }
}

/// Is responsible for displaying content in the terminal.
/// It uses an already created terminal.
pub struct Display {
    /// The Crossterm terminal attached to the display.
    /// It will print every symbol shown on screen.
    term: Terminal<CrosstermBackend<Stdout>>,
    /// The adapter instance used to draw the images
    image_adapter: ImageAdapter,
    /// A static reference to the menu style set by the user in config
    menu_style: &'static MenuStyle,
    /// A static reference to the file style set by the user in config
    file_style: &'static FileStyle,
}

impl Display {
    /// Returns a new `Display` instance from a terminal object.
    pub fn new(term: Terminal<CrosstermBackend<Stdout>>) -> Self {
        log_info!("starting display...");
        let image_adapter = ImageAdapter::detect();
        let menu_style = MENU_STYLES.get().expect("Menu style should be set");
        let file_style = FILE_STYLES.get().expect("FIle style should be set");
        Self {
            term,
            image_adapter,
            menu_style,
            file_style,
        }
    }

    /// Display every possible content in the terminal.
    ///
    /// The top line
    ///
    /// The files if we're displaying them
    ///
    /// The cursor if a content is editable
    ///
    /// The help if `Mode::Help`
    ///
    /// The jump_list if `Mode::Jump`
    ///
    /// The completion list if any.
    ///
    /// The preview in preview mode.
    /// Displays one pane or two panes, depending of the width and current
    /// status of the application.
    pub fn display_all(&mut self, status: &MutexGuard<Status>) -> Result<CompletedFrame<'_>> {
        io::stdout().flush().expect("Couldn't flush the stdout");
        if status.should_tabs_images_be_cleared() {
            self.clear_images();
        }
        if status.should_be_cleared() {
            self.term.clear().expect("Couldn't clear the terminal");
        }
        let Ok(Size { width, height }) = self.term.size() else {
            bail!("Can't get terminal size")
        };
        let full_rect = Rects::full_rect(width, height);
        let inside_border_rect = Rects::inside_border_rect(width, height);
        let borders = self.borders(status);
        let completed_frame = if Self::use_dual_pane(status) {
            self.draw_dual(full_rect, inside_border_rect, borders, status)?
        } else {
            self.draw_single(full_rect, inside_border_rect, borders, status)?
        };
        Ok(completed_frame)
    }

    /// Left File, Left Menu, Right File, Right Menu
    fn borders(&self, status: &MutexGuard<Status>) -> [Style; 4] {
        let mut borders = [self.menu_style.inert_border; 4];
        let selected_border = self.menu_style.selected_border;
        borders[status.focus.index()] = selected_border;
        borders
    }

    /// True iff we need to display both panes
    fn use_dual_pane(status: &Status) -> bool {
        status.use_dual()
    }

    fn draw_dual(
        &mut self,
        full_rect: Rect,
        inside_border_rect: Rect,
        borders: [Style; 4],
        status: &Status,
    ) -> std::io::Result<CompletedFrame<'_>> {
        let (file_left, file_right) = FilesBuilder::dual(status);
        let menu_left = Menu::new(status, 0);
        let menu_right = Menu::new(status, 1);
        let parent_wins = Rects::left_right_inside_rects(full_rect);
        let have_menu_left = status.tabs[0].need_menu_window();
        let have_menu_right = status.tabs[1].need_menu_window();
        let bordered_wins = Rects::dual_bordered_rect(parent_wins, have_menu_left, have_menu_right);
        let inside_wins =
            Rects::dual_inside_rect(inside_border_rect, have_menu_left, have_menu_right);
        self.render_dual(
            status,
            borders,
            bordered_wins,
            inside_wins,
            (file_left, file_right),
            (menu_left, menu_right),
        )
    }

    fn render_dual(
        &mut self,
        status: &Status,
        borders: [Style; 4],
        bordered_wins: Vec<Rect>,
        inside_wins: Vec<Rect>,
        files: (Files, Files),
        menus: (Menu, Menu),
    ) -> std::io::Result<CompletedFrame<'_>> {
        self.term.draw(|f| {
            // 0 File Left | 3 File Right
            // 1 padding   | 4 padding
            // 2 Menu Left | 5 Menu Right
            Self::draw_dual_borders(borders, f, &bordered_wins);
            files.0.draw(
                f,
                &inside_wins[0],
                &mut self.image_adapter,
                self.menu_style,
                self.file_style,
            );
            menus
                .0
                .draw(f, &inside_wins[2], self.menu_style, self.file_style);
            files.1.draw(
                f,
                &inside_wins[3],
                &mut self.image_adapter,
                self.menu_style,
                self.file_style,
            );
            menus
                .1
                .draw(f, &inside_wins[5], self.menu_style, self.file_style);
            if status.internal_settings.cursor.is_active() {
                Self::draw_cursor_selections(f, status);
            }
        })
    }

    /// Display the cursor at its position
    /// Color the selected text (if any) as gray background.
    fn draw_cursor_selections(f: &mut Frame, status: &Status) {
        if let Some(rect) = status.internal_settings.cursor.rect() {
            let buffer = f.buffer_mut();
            for y in rect.y..rect.y + rect.height {
                for x in rect.x..rect.x + rect.width {
                    let Some(cell) = buffer.cell_mut(Position::new(x, y)) else {
                        continue;
                    };
                    cell.modifier |= Modifier::REVERSED;
                }
            }
        }
        if let Some(position) = status.internal_settings.cursor.cursor() {
            f.set_cursor_position(position);
        }
    }

    fn draw_single(
        &mut self,
        rect: Rect,
        inside_border_rect: Rect,
        borders: [Style; 4],
        status: &Status,
    ) -> std::io::Result<CompletedFrame<'_>> {
        let file_left = FilesBuilder::single(status);
        let menu_left = Menu::new(status, 0);
        let need_menu = status.tabs[0].need_menu_window();
        let bordered_wins = Rects::vertical_split_border(rect, need_menu);
        let inside_wins = Rects::vertical_split_inner(inside_border_rect, need_menu);
        self.render_single(
            status,
            borders,
            bordered_wins,
            inside_wins,
            file_left,
            menu_left,
        )
    }

    fn render_single(
        &mut self,
        status: &Status,
        borders: [Style; 4],
        bordered_wins: Rc<[Rect]>,
        inside_wins: Rc<[Rect]>,
        file_left: Files,
        menu_left: Menu,
    ) -> std::io::Result<CompletedFrame<'_>> {
        self.term.draw(|f| {
            Self::draw_single_borders(borders, f, &bordered_wins);
            file_left.draw(
                f,
                &inside_wins[0],
                &mut self.image_adapter,
                self.menu_style,
                self.file_style,
            );
            menu_left.draw(f, &inside_wins[2], self.menu_style, self.file_style);
            if status.internal_settings.cursor.is_active() {
                Self::draw_cursor_selections(f, status);
            }
        })
    }

    fn draw_n_borders(n: usize, borders: [Style; 4], f: &mut Frame, wins: &[Rect]) {
        for i in 0..n {
            let bordered_block = Block::default()
                .borders(Borders::ALL)
                .border_type(BorderType::Rounded)
                .border_style(borders[i]);
            f.render_widget(bordered_block, wins[i]);
        }
    }

    fn draw_dual_borders(borders: [Style; 4], f: &mut Frame, wins: &[Rect]) {
        Self::draw_n_borders(4, borders, f, wins)
    }

    fn draw_single_borders(borders: [Style; 4], f: &mut Frame, wins: &[Rect]) {
        Self::draw_n_borders(2, borders, f, wins)
    }

    /// Clear all images.
    pub fn clear_images(&mut self) {
        log_info!("display.clear_images()");
        self.image_adapter
            .clear_all()
            .expect("Couldn't clear all the images");
        self.term.clear().expect("Couldn't clear the terminal");
    }

    /// Restore the terminal before leaving the application.
    /// - disable raw mode, allowing for "normal" terminal behavior,
    /// - leave alternate screens (switch back to the main screen).
    /// - display the cursor
    pub fn restore_terminal(&mut self) -> Result<()> {
        disable_raw_mode()?;
        execute!(self.term.backend_mut(), LeaveAlternateScreen)?;
        self.term.show_cursor()?;
        Ok(())
    }
}