talon-core 0.4.1

use super::*;

fn default_cfg() -> ChunkerConfig {
    ChunkerConfig::default()
}

fn tiny_cfg() -> ChunkerConfig {
    ChunkerConfig {
        chunk_tokens: 50,
        chunk_overlap: 0,
        chunk_min_tokens: 1,
    }
}

#[test]
fn test_build_heading_path() {
    assert_eq!(build_heading_path(&[]), "");
    assert_eq!(build_heading_path(&["Intro".to_string()]), "Intro");
    assert_eq!(
        build_heading_path(&["Intro".to_string(), "Deep".to_string()]),
        "Intro > Deep"
    );
}

#[test]
fn test_build_embedding_text() {
    let text = build_embedding_text(
        "My Title",
        "notes/test.md",
        &["Section".to_string()],
        "body",
    );
    assert_eq!(
        text,
        "Title: My Title\nPath: notes/test.md\nHeadings: Section\n\nbody"
    );
}

#[test]
fn test_make_chunk_hash() {
    let hash = make_chunk_hash("hello world");
    assert_eq!(hash.len(), 64);
    assert_eq!(
        make_chunk_hash("hello world"),
        make_chunk_hash("hello world")
    );
    assert_ne!(make_chunk_hash("hello"), make_chunk_hash("world"));
}

#[test]
fn test_parser_fidelity_body_is_byte_faithful() {
    let raw = "---\ntitle: Fidelity\nstatus: active\n---\n\n# Body\n\nContent here.\n";
    let parsed = crate::text::frontmatter::parse_frontmatter(raw);
    // body = content after the closing '---' (the \n terminating '---' is included)
    // so body starts with \n (from '---\n') then \n (blank line) then # Body...
    let expected_body = "\n\n# Body\n\nContent here.\n";
    assert_eq!(
        parsed.body, expected_body,
        "body should be everything after the closing '---' marker"
    );
    // Exact reconstruction: "---\n" + frontmatter_raw + "---" + body == raw
    assert_eq!(
        format!("---\n{}---{}", parsed.frontmatter_raw, parsed.body),
        raw,
        "full file should round-trip via frontmatter_raw + body"
    );
}

#[test]
fn test_frontmatter_excluded_from_chunks() {
    // Simulate what wiring.rs does: pass parsed.body, not the full file
    let body = "\n# Filters Note\n\nThis is the body content.\n";
    let chunks = chunk_markdown(body, "Filters Note", "Filters/Note.md", &default_cfg());
    for chunk in &chunks {
        assert!(
            !chunk.text.contains("status:"),
            "chunk text must not contain YAML key 'status:': {:?}",
            chunk.text
        );
        assert!(
            !chunk.text.contains("archived"),
            "chunk text must not contain frontmatter value 'archived': {:?}",
            chunk.text
        );
    }
}

#[test]
fn test_obsidian_inline_comment_stripped() {
    let body = "Visible text. %%hidden comment%% More visible.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    let all_text: String = chunks
        .iter()
        .map(|c| c.text.as_str())
        .collect::<Vec<_>>()
        .join(" ");
    assert!(
        !all_text.contains("%%"),
        "inline Obsidian comment must be stripped: {all_text}"
    );
    assert!(
        !all_text.contains("hidden comment"),
        "comment content must not appear: {all_text}"
    );
}

#[test]
fn test_obsidian_block_comment_stripped() {
    let body = "Before.\n%%\nblock comment line 1\nblock comment line 2\n%%\nAfter.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    let all_text: String = chunks
        .iter()
        .map(|c| c.text.as_str())
        .collect::<Vec<_>>()
        .join("\n");
    assert!(
        !all_text.contains("%%"),
        "block Obsidian comment must be stripped"
    );
    assert!(
        !all_text.contains("block comment line"),
        "comment content must not appear"
    );
    assert!(
        all_text.contains("Before"),
        "content before comment must survive"
    );
    assert!(
        all_text.contains("After"),
        "content after comment must survive"
    );
}

#[test]
fn test_callout_not_split() {
    // CommonMark blockquote — text-splitter treats BlockQuote as a Block level element
    let body = "> [!note]\n> body line 1\n> body line 2\n\nRegular paragraph after callout.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    // The callout lines should appear together in one chunk
    let callout_chunk = chunks.iter().find(|c| c.text.contains("[!note]"));
    assert!(callout_chunk.is_some(), "callout should produce a chunk");
    if let Some(c) = callout_chunk {
        assert!(
            c.text.contains("body line 1") && c.text.contains("body line 2"),
            "callout body lines should be in the same chunk: {:?}",
            c.text
        );
    }
}

#[test]
fn test_math_block_not_split() {
    // pulldown-cmark with Options::all() parses $$…$$ as DisplayMath (Block level)
    let body = "Paragraph before.\n\n$$\n\\frac{a}{b} = c\n$$\n\nParagraph after.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    // There must be no chunk that starts with the equation but lacks the closing $$
    // i.e. no chunk contains only part of the math block
    let math_chunks: Vec<_> = chunks.iter().filter(|c| c.text.contains("frac")).collect();
    for mc in &math_chunks {
        // A chunk containing the math content must also contain the delimiter or the full equation
        assert!(
            mc.text.contains("$$") || (mc.text.contains("frac") && !mc.text.contains("$$")),
            "math block chunk should not be split mid-equation: {:?}",
            mc.text
        );
    }
    // Verify the equation text appears somewhere (not stripped)
    assert!(
        chunks.iter().any(|c| c.text.contains("frac")),
        "math equation content must survive in chunks"
    );
}

#[test]
fn test_fenced_code_block_not_split() {
    let body =
        "Before code.\n\n```rust\nfn hello() {\n    println!(\"hello\");\n}\n```\n\nAfter code.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    // No chunk should start with ``` without also ending with ```
    for chunk in &chunks {
        let fence_count = chunk.text.matches("```").count();
        if fence_count > 0 {
            assert!(
                fence_count >= 2 || !chunk.text.trim_start().starts_with("```"),
                "fenced code block must not be split mid-fence: {:?}",
                chunk.text
            );
        }
    }
    // The function body must appear somewhere
    assert!(
        chunks.iter().any(|c| c.text.contains("println")),
        "code block content must survive"
    );
}

#[test]
fn test_block_id_preserved_inline() {
    let body = "This is a paragraph with a block ID. ^my-block-id\n\nAnother paragraph.";
    let chunks = chunk_markdown(body, "T", "t.md", &default_cfg());
    let has_block_id = chunks.iter().any(|c| c.text.contains("^my-block-id"));
    assert!(has_block_id, "block IDs should be preserved inside chunks");
}

#[test]
fn test_heading_only_chunk_skipped() {
    // A body with only a heading and no body text
    let body = "# Just A Heading\n";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    assert!(
        chunks.is_empty(),
        "heading-only content should produce no chunks, got: {chunks:?}"
    );
}

#[test]
fn test_separator_only_chunk_skipped() {
    let body = "Some text.\n\n---\n\nMore text.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    // No chunk should contain only '---'
    for chunk in &chunks {
        assert_ne!(
            chunk.text.trim(),
            "---",
            "separator-only chunk must be filtered"
        );
    }
}

#[test]
fn test_single_wikilink_chunk_skipped() {
    let body = "[[Some Note]]\n\nThis is real content.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    for chunk in &chunks {
        assert_ne!(
            chunk.text.trim(),
            "[[Some Note]]",
            "single wikilink chunk must be filtered"
        );
    }
}

#[test]
fn test_single_image_embed_chunk_skipped() {
    let body = "![[image.png]]\n\nThis is real content.";
    let chunks = chunk_markdown(body, "T", "t.md", &tiny_cfg());
    for chunk in &chunks {
        assert_ne!(
            chunk.text.trim(),
            "![[image.png]]",
            "single image embed chunk must be filtered"
        );
    }
}

#[test]
fn test_chunk_min_tokens_filters_tiny_chunks() {
    let body =
        "Hi.\n\nThis is a much longer paragraph with many more words to exceed the threshold.";
    let strict_cfg = ChunkerConfig {
        chunk_tokens: 20,
        chunk_overlap: 0,
        chunk_min_tokens: 10,
    };
    let chunks = chunk_markdown(body, "T", "t.md", &strict_cfg);
    for chunk in &chunks {
        assert!(
            chunk.token_estimate >= 10,
            "chunk below min_tokens should have been filtered: {:?} (tokens: {})",
            chunk.text,
            chunk.token_estimate
        );
    }
}

#[test]
fn test_heading_context_tracked() {
    // Use a chunk limit small enough to force splitting between the two sections.
    let split_cfg = ChunkerConfig {
        chunk_tokens: 15,
        chunk_overlap: 0,
        chunk_min_tokens: 1,
    };
    // Each section must exceed 15 tokens so the splitter has to respect the heading boundary.
    let section_one = "# Section One\n\nThis is the first paragraph under section one. It has enough words to require splitting.";
    let section_two = "## Subsection\n\nThis is the second paragraph under the subsection. It also has enough words to force a split.";
    let body = format!("{section_one}\n\n{section_two}");
    let chunks = chunk_markdown(&body, "Doc", "doc.md", &split_cfg);

    // After the heading line "# Section One", chunks in that region carry "Section One".
    // After "## Subsection", chunks carry "Section One > Subsection".
    let has_section_one = chunks.iter().any(|c| c.heading_path == "Section One");
    let has_subsection = chunks
        .iter()
        .any(|c| c.heading_path == "Section One > Subsection");
    assert!(
        has_section_one,
        "first section heading path should appear; chunks: {:?}",
        chunks.iter().map(|c| &c.heading_path).collect::<Vec<_>>()
    );
    assert!(
        has_subsection,
        "subsection heading path should appear; chunks: {:?}",
        chunks.iter().map(|c| &c.heading_path).collect::<Vec<_>>()
    );
}

#[test]
fn test_empty_body_produces_no_chunks() {
    assert!(chunk_markdown("", "T", "t.md", &default_cfg()).is_empty());
}

#[test]
fn test_whitespace_only_body_produces_no_chunks() {
    assert!(chunk_markdown("   \n\n  ", "T", "t.md", &default_cfg()).is_empty());
}

#[test]
fn test_chunk_hash_is_stable() {
    let body = "# Test\n\nSome stable content.";
    let c1 = chunk_markdown(body, "Test", "test.md", &default_cfg());
    let c2 = chunk_markdown(body, "Test", "test.md", &default_cfg());
    assert_eq!(c1.len(), c2.len());
    for (a, b) in c1.iter().zip(c2.iter()) {
        assert_eq!(a.chunk_hash, b.chunk_hash);
    }
}