//! Exact extraction provenance and same-metadata mutation regressions.
use anyhow::Result;
use searchi_core::SearchIndex;
use sha2::{Digest, Sha256};
use std::{fs, fs::FileTimes};

#[test]
fn same_stat_overwrite_invalidates_agent_excerpt_and_rescan_reextracts() -> Result<()> {
    let directory = tempfile::tempdir()?;
    let path = directory.path().join("source.rs");
    let original = "fn old_symbol() { /* first */ }\n";
    let changed = "fn new_symbol() { /* other */ }\n";
    assert_eq!(original.len(), changed.len());
    fs::write(&path, original)?;
    let mut index = SearchIndex::open(":memory:")?;
    index.index_folder(directory.path())?;
    let passage = index.passage_batch(0, 1)?.remove(0);
    assert_eq!(
        index.extracted_source_hash(&passage.path)?,
        Some(format!("{:x}", Sha256::digest(original.as_bytes())))
    );
    let modified = fs::metadata(&path)?.modified()?;
    fs::write(&path, changed)?;
    fs::File::options()
        .write(true)
        .open(&path)?
        .set_times(FileTimes::new().set_modified(modified))?;
    assert!(index
        .source_passage(&passage.path, &passage.source, 8192)?
        .is_none());
    let report = index.index_folder(directory.path())?;
    assert_eq!(report.indexed, 1);
    assert_eq!(report.unchanged, 0);
    let fresh = index.passage_batch(0, 1)?.remove(0);
    assert_eq!(fresh.text, changed);
    assert_eq!(
        index.extracted_source_hash(&fresh.path)?,
        Some(format!("{:x}", Sha256::digest(changed.as_bytes())))
    );
    assert_eq!(
        index
            .source_passage(&fresh.path, &fresh.source, 8192)?
            .unwrap()
            .text,
        changed
    );
    assert_eq!(index.index_folder(directory.path())?.unchanged, 1);
    Ok(())
}

#[test]
fn schema_eleven_keeps_lexical_content_but_requires_extraction_provenance() -> Result<()> {
    let directory = tempfile::tempdir()?;
    let root = directory.path().join("docs");
    fs::create_dir(&root)?;
    fs::write(root.join("notes.txt"), "preserved migration evidence")?;
    let db = directory.path().join("index.db");
    let passage;
    {
        let mut index = SearchIndex::open(&db)?;
        index.index_folder(&root)?;
        passage = index.passage_batch(0, 1)?.remove(0);
    }
    let connection = rusqlite::Connection::open(&db)?;
    connection
        .execute_batch("ALTER TABLE files DROP COLUMN extracted_sha256; PRAGMA user_version=11;")?;
    drop(connection);
    let mut index = SearchIndex::open(&db)?;
    assert_eq!(index.search("migration", 10)?.len(), 1);
    assert!(index.extracted_source_hash(&passage.path)?.is_none());
    assert!(index
        .source_passage(&passage.path, &passage.source, 8192)?
        .is_none());
    assert_eq!(index.index_folder(&root)?.indexed, 1);
    assert!(index.extracted_source_hash(&passage.path)?.is_some());
    assert_eq!(index.index_folder(&root)?.unchanged, 1);
    Ok(())
}

#[test]
fn oversized_text_and_unsupported_files_remain_filename_only() -> Result<()> {
    let directory = tempfile::tempdir()?;
    let large = directory.path().join("large.txt");
    fs::File::create(&large)?.set_len(2 * 1024 * 1024 + 1)?;
    fs::File::create(directory.path().join("movie.mp4"))?.set_len(100 * 1024 * 1024)?;
    let mut index = SearchIndex::open(":memory:")?;
    assert_eq!(index.index_folder(directory.path())?.indexed, 2);
    assert!(index.passage_batch(0, 64)?.is_empty());
    assert_eq!(index.index_folder(directory.path())?.unchanged, 2);
    assert_eq!(index.search("large.txt", 10)?.len(), 1);
    Ok(())
}