minni 0.1.0

use super::languages::SupportedLanguage;
use crate::db::CodeChunk;
use anyhow::Result;
use chrono::Utc;
use tree_sitter::{Parser, Tree};
use uuid::Uuid;

/// Chunking options.
#[derive(Clone)]
pub struct ChunkConfig {
    pub min_chunk_lines: usize,
    pub max_chunk_lines: usize,
    pub overlap_lines: usize,
    pub include_file_chunks: bool,
}

impl Default for ChunkConfig {
    fn default() -> Self {
        Self {
            min_chunk_lines: 5,
            max_chunk_lines: 100,
            overlap_lines: 2,
            include_file_chunks: true,
        }
    }
}

/// Derive a dotted module path from a file path.
fn derive_module_path(file_path: &str) -> String {
    // Normalise path separators to '/'
    let normalised = file_path.replace('\\', "/");

    // Strip a leading `src/` or `lib/` prefix (only at the very start)
    let stripped = normalised
        .strip_prefix("src/")
        .or_else(|| normalised.strip_prefix("lib/"))
        .unwrap_or(&normalised);

    // Strip file extension
    let no_ext = if let Some(pos) = stripped.rfind('.') {
        // Make sure the dot isn't part of a directory component
        let after_last_slash = stripped.rfind('/').map(|i| i + 1).unwrap_or(0);
        if pos > after_last_slash {
            &stripped[..pos]
        } else {
            stripped
        }
    } else {
        stripped
    };

    // Handle `mod`, `__init__`, `index` as "directory-level" modules
    let parts: Vec<&str> = no_ext.split('/').collect();
    let trim_last = parts
        .last()
        .map(|last| *last == "mod" || *last == "__init__" || *last == "index")
        .unwrap_or(false);
    let final_parts = if trim_last {
        &parts[..parts.len().saturating_sub(1)]
    } else {
        parts.as_slice()
    };

    let result = final_parts.join(".");
    // Return the path as-is if we ended up with an empty string (edge case)
    if result.is_empty() {
        no_ext.replace('/', ".")
    } else {
        result
    }
}

pub fn chunk_file(
    content: &str,
    file_path: &str,
    language: SupportedLanguage,
    config: &ChunkConfig,
) -> Result<(Vec<CodeChunk>, Tree)> {
    let mut chunks = Vec::new();
    let lines: Vec<&str> = content.lines().collect();
    let timestamp = Utc::now().to_rfc3339();

    // Derive module_path once for the whole file
    let module_path = Some(derive_module_path(file_path));

    // Parse with tree-sitter
    let mut parser = Parser::new();
    parser
        .set_language(&language.tree_sitter_language())
        .map_err(|e| anyhow::anyhow!("Failed to set language: {}", e))?;

    let tree = parser
        .parse(content, None)
        .ok_or_else(|| anyhow::anyhow!("Failed to parse file"))?;

    // Extract semantic chunks (functions, classes, etc.)
    extract_semantic_chunks(
        &tree,
        content,
        file_path,
        language,
        config.min_chunk_lines,
        &mut chunks,
        &timestamp,
        module_path.as_deref(),
    );

    // If no semantic chunks found or file is small, create a file-level chunk
    if chunks.is_empty() || (config.include_file_chunks && lines.len() <= config.max_chunk_lines) {
        let file_chunk = CodeChunk {
            id: Uuid::new_v4().to_string(),
            file_path: file_path.to_string(),
            content: content.to_string(),
            start_line: 1,
            end_line: lines.len() as u32,
            chunk_type: "file".to_string(),
            language: language.name().to_string(),
            symbol_name: None,
            content_hash: compute_content_hash(content),
            indexed_at: timestamp.clone(),
            parent_symbol: None,
            signature: None,
            doc_comment: None,
            module_path: module_path.clone(),
        };
        chunks.push(file_chunk);
    }

    // For large files without semantic structure, create overlapping chunks
    if chunks.is_empty() && lines.len() > config.max_chunk_lines {
        let mut start = 0;
        while start < lines.len() {
            let end = (start + config.max_chunk_lines).min(lines.len());
            let chunk_content = lines[start..end].join("\n");

            let chunk = CodeChunk {
                id: Uuid::new_v4().to_string(),
                file_path: file_path.to_string(),
                content: chunk_content.clone(),
                start_line: (start + 1) as u32,
                end_line: end as u32,
                chunk_type: "block".to_string(),
                language: language.name().to_string(),
                symbol_name: None,
                content_hash: compute_content_hash(&chunk_content),
                indexed_at: timestamp.clone(),
                parent_symbol: None,
                signature: None,
                doc_comment: None,
                module_path: module_path.clone(),
            };
            chunks.push(chunk);

            if end >= lines.len() {
                break;
            }
            start = end - config.overlap_lines;
        }
    }

    Ok((chunks, tree))
}

/// Chunk a non-code file.
pub fn chunk_plain_text(
    content: &str,
    file_path: &str,
    language_label: &str,
    config: &ChunkConfig,
) -> Result<Vec<CodeChunk>> {
    let lines: Vec<&str> = content.lines().collect();
    let timestamp = Utc::now().to_rfc3339();
    let module_path = Some(derive_module_path(file_path));

    if lines.is_empty() {
        return Ok(Vec::new());
    }

    let chunks = if language_label == "markdown" {
        chunk_markdown(
            &lines,
            file_path,
            language_label,
            config,
            &timestamp,
            module_path.as_deref(),
        )
    } else {
        chunk_lines_overlap(
            &lines,
            file_path,
            language_label,
            config,
            &timestamp,
            module_path.as_deref(),
        )
    };

    Ok(chunks)
}

/// Split a markdown file on heading boundaries (lines starting with `#`).
/// Each section's `symbol_name` is the heading text (stripped of `#` prefix).
/// `chunk_type` is `"section"`. Over-large sections fall through to overlapping line chunks.
/// If no headings are found, falls back to `chunk_lines_overlap`.
fn chunk_markdown(
    lines: &[&str],
    file_path: &str,
    language_label: &str,
    config: &ChunkConfig,
    timestamp: &str,
    module_path: Option<&str>,
) -> Vec<CodeChunk> {
    let mut chunks = Vec::new();
    let mut section_start = 0;
    let mut section_heading: Option<String> = None;
    let mut found_heading = false;

    for (i, line) in lines.iter().enumerate() {
        let is_heading = line.starts_with('#');
        let is_last = i == lines.len() - 1;

        if is_heading || is_last {
            // Determine the end of the accumulated section
            let section_end = if is_last && !is_heading { i + 1 } else { i };

            if section_end > section_start {
                let section_content = lines[section_start..section_end].join("\n");
                if !section_content.trim().is_empty() {
                    if section_end - section_start > config.max_chunk_lines {
                        // Section too large — break into overlapping sub-chunks
                        let sub_lines = &lines[section_start..section_end];
                        let sub_chunks = chunk_lines_overlap_with_offset(
                            sub_lines,
                            file_path,
                            language_label,
                            config,
                            timestamp,
                            module_path,
                            section_start,
                            section_heading.as_deref(),
                        );
                        chunks.extend(sub_chunks);
                    } else {
                        chunks.push(CodeChunk {
                            id: Uuid::new_v4().to_string(),
                            file_path: file_path.to_string(),
                            content: section_content.clone(),
                            start_line: (section_start + 1) as u32,
                            end_line: section_end as u32,
                            chunk_type: "section".to_string(),
                            language: language_label.to_string(),
                            symbol_name: section_heading.clone(),
                            content_hash: compute_content_hash(&section_content),
                            indexed_at: timestamp.to_string(),
                            parent_symbol: None,
                            signature: None,
                            doc_comment: None,
                            module_path: module_path.map(|s| s.to_string()),
                        });
                    }
                }
            }

            if is_heading {
                found_heading = true;
                section_start = i;
                section_heading = Some(line.trim_start_matches('#').trim().to_string());

                // Handle the edge case where the heading is the very last line
                if is_last {
                    let section_content = lines[i..=i].join("\n");
                    chunks.push(CodeChunk {
                        id: Uuid::new_v4().to_string(),
                        file_path: file_path.to_string(),
                        content: section_content.clone(),
                        start_line: (i + 1) as u32,
                        end_line: (i + 1) as u32,
                        chunk_type: "section".to_string(),
                        language: language_label.to_string(),
                        symbol_name: section_heading.clone(),
                        content_hash: compute_content_hash(&section_content),
                        indexed_at: timestamp.to_string(),
                        parent_symbol: None,
                        signature: None,
                        doc_comment: None,
                        module_path: module_path.map(|s| s.to_string()),
                    });
                }
            }
        }
    }

    // No headings found → fall back to line-based chunking
    if !found_heading {
        return chunk_lines_overlap(
            lines,
            file_path,
            language_label,
            config,
            timestamp,
            module_path,
        );
    }

    chunks
}

/// Fixed-size overlapping line chunks with no offset.
fn chunk_lines_overlap(
    lines: &[&str],
    file_path: &str,
    language_label: &str,
    config: &ChunkConfig,
    timestamp: &str,
    module_path: Option<&str>,
) -> Vec<CodeChunk> {
    chunk_lines_overlap_with_offset(
        lines,
        file_path,
        language_label,
        config,
        timestamp,
        module_path,
        0,
        None,
    )
}

/// Fixed-size overlapping line chunks, with a `line_offset` for correct absolute line numbers
/// and an optional `symbol_name` to attach to every produced chunk.
fn chunk_lines_overlap_with_offset(
    lines: &[&str],
    file_path: &str,
    language_label: &str,
    config: &ChunkConfig,
    timestamp: &str,
    module_path: Option<&str>,
    line_offset: usize,
    symbol_name: Option<&str>,
) -> Vec<CodeChunk> {
    let mut chunks = Vec::new();

    // If file/section fits in one chunk, emit it as a single block
    if lines.len() <= config.max_chunk_lines {
        let content = lines.join("\n");
        if !content.trim().is_empty() {
            chunks.push(CodeChunk {
                id: Uuid::new_v4().to_string(),
                file_path: file_path.to_string(),
                content: content.clone(),
                start_line: (line_offset + 1) as u32,
                end_line: (line_offset + lines.len()) as u32,
                chunk_type: "block".to_string(),
                language: language_label.to_string(),
                symbol_name: symbol_name.map(|s| s.to_string()),
                content_hash: compute_content_hash(&content),
                indexed_at: timestamp.to_string(),
                parent_symbol: None,
                signature: None,
                doc_comment: None,
                module_path: module_path.map(|s| s.to_string()),
            });
        }
        return chunks;
    }

    // Overlapping window over the lines
    let mut start = 0;
    while start < lines.len() {
        let end = (start + config.max_chunk_lines).min(lines.len());
        let chunk_content = lines[start..end].join("\n");

        chunks.push(CodeChunk {
            id: Uuid::new_v4().to_string(),
            file_path: file_path.to_string(),
            content: chunk_content.clone(),
            start_line: (line_offset + start + 1) as u32,
            end_line: (line_offset + end) as u32,
            chunk_type: "block".to_string(),
            language: language_label.to_string(),
            symbol_name: symbol_name.map(|s| s.to_string()),
            content_hash: compute_content_hash(&chunk_content),
            indexed_at: timestamp.to_string(),
            parent_symbol: None,
            signature: None,
            doc_comment: None,
            module_path: module_path.map(|s| s.to_string()),
        });

        if end >= lines.len() {
            break;
        }
        start = end - config.overlap_lines;
    }

    chunks
}

fn extract_semantic_chunks(
    tree: &Tree,
    content: &str,
    file_path: &str,
    language: SupportedLanguage,
    min_chunk_lines: usize,
    chunks: &mut Vec<CodeChunk>,
    timestamp: &str,
    module_path: Option<&str>,
) {
    let root = tree.root_node();
    let mut cursor = root.walk();
    let lines: Vec<&str> = content.lines().collect();

    let function_types = language.function_node_types();
    let class_types = language.class_node_types();

    fn visit_node(
        cursor: &mut tree_sitter::TreeCursor,
        content: &str,
        lines: &[&str],
        file_path: &str,
        language: SupportedLanguage,
        min_chunk_lines: usize,
        function_types: &[&str],
        class_types: &[&str],
        chunks: &mut Vec<CodeChunk>,
        timestamp: &str,
        module_path: Option<&str>,
    ) {
        let node = cursor.node();
        let node_type = node.kind();

        let chunk_type = if function_types.contains(&node_type) {
            Some("function")
        } else if class_types.contains(&node_type) {
            Some("class")
        } else {
            None
        };

        if let Some(chunk_type) = chunk_type {
            let start_line = node.start_position().row;
            let end_line = node.end_position().row;
            let line_count = end_line.saturating_sub(start_line) + 1;

            // Skip nodes below configured minimum size.
            if line_count >= min_chunk_lines {
                let chunk_content = lines[start_line..=end_line.min(lines.len() - 1)].join("\n");

                // Try to extract the symbol name
                let symbol_name = node
                    .child_by_field_name(language.name_field())
                    .map(|n| n.utf8_text(content.as_bytes()).unwrap_or("").to_string())
                    .filter(|s| !s.is_empty());

                // Extract parent_symbol: walk up to the nearest enclosing class/struct/impl
                let parent_symbol = extract_parent_symbol(&node, content, class_types, language);

                // Extract signature: text from node start up to (not including) the body
                let signature = if chunk_type == "function" {
                    extract_signature(&node, content)
                } else {
                    None
                };

                // Extract doc_comment: look at the preceding sibling for a comment node
                let doc_comment = extract_doc_comment(&node, content, language);

                let chunk = CodeChunk {
                    id: Uuid::new_v4().to_string(),
                    file_path: file_path.to_string(),
                    content: chunk_content.clone(),
                    start_line: (start_line + 1) as u32,
                    end_line: (end_line + 1) as u32,
                    chunk_type: chunk_type.to_string(),
                    language: language.name().to_string(),
                    symbol_name,
                    content_hash: compute_content_hash(&chunk_content),
                    indexed_at: timestamp.to_string(),
                    parent_symbol,
                    signature,
                    doc_comment,
                    module_path: module_path.map(|s| s.to_string()),
                };
                chunks.push(chunk);
            }
        }

        // Visit children
        if cursor.goto_first_child() {
            loop {
                visit_node(
                    cursor,
                    content,
                    lines,
                    file_path,
                    language,
                    min_chunk_lines,
                    function_types,
                    class_types,
                    chunks,
                    timestamp,
                    module_path,
                );
                if !cursor.goto_next_sibling() {
                    break;
                }
            }
            cursor.goto_parent();
        }
    }

    visit_node(
        &mut cursor,
        content,
        &lines,
        file_path,
        language,
        min_chunk_lines,
        function_types,
        class_types,
        chunks,
        timestamp,
        module_path,
    );
}

/// Walk up the node's parent chain to find the nearest enclosing class/struct/impl.
fn extract_parent_symbol(
    node: &tree_sitter::Node,
    content: &str,
    class_types: &[&str],
    language: SupportedLanguage,
) -> Option<String> {
    let mut current = node.parent()?;
    loop {
        if class_types.contains(&current.kind()) {
            // Try to get the name field from the parent class/struct/impl
            let name = current
                .child_by_field_name(language.name_field())
                .and_then(|n| n.utf8_text(content.as_bytes()).ok())
                .map(|s| s.to_string())
                .filter(|s| !s.is_empty());
            if name.is_some() {
                return name;
            }
        }
        match current.parent() {
            Some(p) => current = p,
            None => break,
        }
    }
    None
}

/// Extract the signature of a function node: text from the node start up to (but not
/// including) the body child node. Falls back to the first line of the node.
fn extract_signature(node: &tree_sitter::Node, content: &str) -> Option<String> {
    let content_bytes = content.as_bytes();

    // Primary: use the named "body" field that most tree-sitter grammars provide.
    // Fallback: scan children for well-known body-like node kinds.
    let body_start = node
        .child_by_field_name("body")
        .map(|b| b.start_byte())
        .or_else(|| {
            (0..node.child_count())
                .filter_map(|i| node.child(i))
                .find(|child| {
                    matches!(
                        child.kind(),
                        "body"
                            | "block"
                            | "declaration_list"
                            | "field_declaration_list"
                            | "class_body"
                            | "statement_block"
                            | "compound_statement"
                            | "function_body"
                    )
                })
                .map(|body_node| body_node.start_byte())
        });

    let sig_bytes = if let Some(body_start_byte) = body_start {
        let node_start = node.start_byte();
        if body_start_byte > node_start {
            &content_bytes[node_start..body_start_byte]
        } else {
            return None;
        }
    } else {
        // No body child found — take the first line of the node
        let start = node.start_byte();
        let end = node.end_byte().min(content_bytes.len());
        let text = std::str::from_utf8(&content_bytes[start..end]).unwrap_or("");
        let first_line = text.lines().next().unwrap_or("").trim();
        return if first_line.is_empty() {
            None
        } else {
            Some(first_line.to_string())
        };
    };

    let sig_str = std::str::from_utf8(sig_bytes).unwrap_or("").trim();
    if sig_str.is_empty() {
        None
    } else {
        Some(sig_str.to_string())
    }
}

/// Look at the node's preceding sibling for a comment node or Python docstring.
/// For Python, also check the first statement in the function body for a string expression.
fn extract_doc_comment(
    node: &tree_sitter::Node,
    content: &str,
    language: SupportedLanguage,
) -> Option<String> {
    let content_bytes = content.as_bytes();

    // Check the immediately preceding named sibling for a comment or doc node.
    // Also handle `expression_statement > string` for Python docstrings that appear
    // as a preceding sibling in some tree-sitter grammar versions.
    if let Some(prev) = node.prev_sibling() {
        let kind = prev.kind();
        if kind.contains("comment") || kind.contains("doc") {
            let text = prev
                .utf8_text(content_bytes)
                .unwrap_or("")
                .trim()
                .to_string();
            if !text.is_empty() {
                return Some(text);
            }
        }
        // Python only: preceding sibling may be an expression_statement wrapping a string literal
        if matches!(language, SupportedLanguage::Python)
            && (kind == "expression_statement" || kind == "string")
        {
            let string_node = if kind == "expression_statement" {
                // find the first named child of kind "string"
                (0..prev.child_count())
                    .filter_map(|i| prev.child(i))
                    .find(|c| c.kind() == "string")
            } else {
                Some(prev)
            };
            if let Some(s) = string_node {
                let text = s.utf8_text(content_bytes).unwrap_or("").trim().to_string();
                if !text.is_empty() {
                    return Some(text);
                }
            }
        }
    }

    // For Python: check first named statement in the function body for a string (docstring).
    if matches!(language, SupportedLanguage::Python) {
        if let Some(body) = node.child_by_field_name("body") {
            // Walk named children only; stop after the first one.
            for i in 0..body.child_count() {
                if let Some(child) = body.child(i) {
                    if !child.is_named() {
                        continue;
                    }
                    let kind = child.kind();
                    // The docstring may appear directly as a `string` node or wrapped in
                    // `expression_statement`.
                    if kind == "string" {
                        let text = child
                            .utf8_text(content_bytes)
                            .unwrap_or("")
                            .trim()
                            .to_string();
                        if !text.is_empty() {
                            return Some(text);
                        }
                    } else if kind == "expression_statement" {
                        // find first child of kind "string"
                        let string_node = (0..child.child_count())
                            .filter_map(|i| child.child(i))
                            .find(|c| c.kind() == "string");
                        if let Some(s) = string_node {
                            let text = s.utf8_text(content_bytes).unwrap_or("").trim().to_string();
                            if !text.is_empty() {
                                return Some(text);
                            }
                        }
                    }
                    break; // Only inspect the very first named child
                }
            }
        }
    }

    None
}

fn compute_content_hash(content: &str) -> String {
    use sha2::{Digest, Sha256};
    let mut hasher = Sha256::new();
    hasher.update(content.as_bytes());
    hex::encode(hasher.finalize())
}

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

    #[test]
    fn test_derive_module_path_rust() {
        assert_eq!(derive_module_path("src/search/bm25.rs"), "search.bm25");
        assert_eq!(derive_module_path("src/indexer/mod.rs"), "indexer");
        assert_eq!(derive_module_path("src/lib.rs"), "lib");
        assert_eq!(derive_module_path("src/db/mod.rs"), "db");
        assert_eq!(derive_module_path("src/cli/search.rs"), "cli.search");
    }

    #[test]
    fn test_derive_module_path_python() {
        assert_eq!(derive_module_path("app/utils/__init__.py"), "app.utils");
        assert_eq!(
            derive_module_path("app/utils/helpers.py"),
            "app.utils.helpers"
        );
    }

    #[test]
    fn test_derive_module_path_no_prefix() {
        assert_eq!(derive_module_path("main.rs"), "main");
        assert_eq!(derive_module_path("utils/helpers.ts"), "utils.helpers");
    }

    #[test]
    fn test_derive_module_path_windows_separators() {
        assert_eq!(derive_module_path("src\\search\\bm25.rs"), "search.bm25");
    }

    // ── chunk_plain_text tests ──────────────────────────────────────────────

    fn default_config() -> ChunkConfig {
        ChunkConfig {
            min_chunk_lines: 1,
            max_chunk_lines: 10,
            overlap_lines: 2,
            include_file_chunks: true,
        }
    }

    #[test]
    fn test_chunk_plain_text_empty_file() {
        let cfg = default_config();
        let result = chunk_plain_text("", "README.md", "markdown", &cfg).unwrap();
        assert!(result.is_empty(), "empty file should produce no chunks");
    }

    #[test]
    fn test_chunk_plain_text_whitespace_only() {
        let cfg = default_config();
        let result = chunk_plain_text("   \n\n  ", "README.md", "markdown", &cfg).unwrap();
        assert!(
            result.is_empty(),
            "whitespace-only file should produce no chunks"
        );
    }

    #[test]
    fn test_chunk_markdown_sections() {
        let cfg = default_config();
        let content = "# Introduction\nHello world.\n\n# Usage\nRun `cargo build`.\n";
        let chunks = chunk_plain_text(content, "README.md", "markdown", &cfg).unwrap();

        // Should produce two sections: "Introduction" and "Usage"
        assert_eq!(chunks.len(), 2);

        let intro = &chunks[0];
        assert_eq!(intro.chunk_type, "section");
        assert_eq!(intro.symbol_name.as_deref(), Some("Introduction"));
        assert_eq!(intro.language, "markdown");

        let usage = &chunks[1];
        assert_eq!(usage.chunk_type, "section");
        assert_eq!(usage.symbol_name.as_deref(), Some("Usage"));
    }

    #[test]
    fn test_chunk_markdown_no_headings_falls_back_to_blocks() {
        let cfg = default_config();
        let content = "Just some prose\nwith multiple lines\nbut no headings at all.\n";
        let chunks = chunk_plain_text(content, "notes.md", "markdown", &cfg).unwrap();

        assert!(!chunks.is_empty(), "should produce at least one chunk");
        // Without headings every chunk must be a "block", not a "section"
        for chunk in &chunks {
            assert_eq!(chunk.chunk_type, "block");
            assert_eq!(chunk.language, "markdown");
        }
    }

    #[test]
    fn test_chunk_plain_text_yaml_produces_blocks() {
        let cfg = default_config();
        let content = "name: my-app\nversion: 1.0\nenv: production\n";
        let chunks = chunk_plain_text(content, ".github/workflows/ci.yml", "yaml", &cfg).unwrap();

        assert!(!chunks.is_empty());
        for chunk in &chunks {
            assert_eq!(chunk.chunk_type, "block");
            assert_eq!(chunk.language, "yaml");
        }
    }

    #[test]
    fn test_chunk_plain_text_overlapping_large_file() {
        let cfg = ChunkConfig {
            max_chunk_lines: 5,
            overlap_lines: 2,
            ..default_config()
        };
        // 12-line file: should be split into overlapping chunks
        let lines: Vec<String> = (1..=12).map(|i| format!("line {i}")).collect();
        let content = lines.join("\n");
        let chunks = chunk_plain_text(&content, "big.sql", "sql", &cfg).unwrap();

        assert!(
            chunks.len() > 1,
            "large file should split into multiple chunks"
        );

        // All chunks should be "block"
        for chunk in &chunks {
            assert_eq!(chunk.chunk_type, "block");
        }

        // First chunk starts at line 1
        assert_eq!(chunks[0].start_line, 1);

        // Last chunk's end_line should be 12
        let last = chunks.last().unwrap();
        assert_eq!(last.end_line, 12);
    }

    #[test]
    fn test_chunk_markdown_heading_only_last_line() {
        let cfg = default_config();
        // Heading is the very last line — should still produce a section chunk
        let content = "Some intro text.\n# Trailing Heading";
        let chunks = chunk_plain_text(content, "README.md", "markdown", &cfg).unwrap();

        let trailing = chunks
            .iter()
            .find(|c| c.symbol_name.as_deref() == Some("Trailing Heading"));
        assert!(
            trailing.is_some(),
            "heading on last line should create a section chunk"
        );
    }
}