use deduper::{find_duplicate_groups, hamming, scan_images, DuplicateKind};
use std::path::Path;

fn fixture(name: &str) -> String {
    format!("/a0/usr/projects/deduper/.a0proj/test_media/images/{name}")
}

#[test]
fn image_phase_real_files_red_green() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images");
    let entries = scan_images(dir).expect("scan images");
    assert!(entries.len() >= 5, "need fixtures");

    let orig = entries
        .iter()
        .find(|e| e.path == Path::new(&fixture("orig.jpg")))
        .unwrap();
    let copy = entries
        .iter()
        .find(|e| e.path == Path::new(&fixture("orig_copy.jpg")))
        .unwrap();
    let resized = entries
        .iter()
        .find(|e| e.path == Path::new(&fixture("orig_resized.jpg")))
        .unwrap();
    let blue = entries
        .iter()
        .find(|e| e.path == Path::new(&fixture("solid_blue.jpg")))
        .unwrap();

    assert_eq!(orig.sha256, copy.sha256);
    assert!(hamming(orig.dhash, resized.dhash) <= 8, "resized should be similar");
    assert!(hamming(orig.dhash, blue.dhash) > 8, "blue should be unrelated");

    let groups = find_duplicate_groups(&entries, 8);
    assert!(groups.iter().any(|g| {
        g.kind == DuplicateKind::Exact
            && g.paths.iter().any(|p| p.ends_with("orig.jpg"))
            && g.paths.iter().any(|p| p.ends_with("orig_copy.jpg"))
    }), "missing exact group");
    assert!(groups.iter().any(|g| {
        g.kind == DuplicateKind::Similar
            && g.paths.iter().any(|p| p.ends_with("orig.jpg"))
            && g.paths.iter().any(|p| p.ends_with("orig_resized.jpg"))
    }), "missing similar group");
    assert!(!groups.iter().any(|g| {
        g.paths.iter().any(|p| p.ends_with("solid_blue.jpg"))
            && g.paths.iter().any(|p| p.ends_with("orig.jpg"))
    }), "false positive with unrelated image");
}

#[test]
fn scan_empty_dir_returns_no_entries() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images/empty_dir");
    let entries = scan_images(dir).expect("scan empty dir");
    assert!(entries.is_empty(), "empty dir should yield no entries");
}

#[test]
fn cropped_image_similar_to_original() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images");
    let entries = scan_images(dir).expect("scan");
    let orig = entries.iter().find(|e| e.path.ends_with("orig.jpg")).expect("orig.jpg");
    let cropped = entries.iter().find(|e| e.path.ends_with("orig_cropped.jpg")).expect("orig_cropped.jpg");
    assert_ne!(orig.sha256, cropped.sha256, "cropped should differ in bytes");
    assert!(hamming(orig.dhash, cropped.dhash) <= 12, "cropped should be perceptually similar (hamming <= 12)");
}

#[test]
fn non_image_files_excluded_from_scan() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images");
    let entries = scan_images(dir).expect("scan");
    // readme.txt and data.csv exist in dir but must not appear in results
    assert!(!entries.iter().any(|e| e.path.ends_with("readme.txt")), "txt file should be excluded");
    assert!(!entries.iter().any(|e| e.path.ends_with("data.csv")), "csv file should be excluded");
    // all entries should have image extensions
    for e in &entries {
        let ext = e.path.extension().unwrap().to_str().unwrap().to_ascii_lowercase();
        assert!(matches!(ext.as_str(), "jpg"|"jpeg"|"png"|"webp"|"bmp"|"gif"|"tif"|"tiff"),
            "unexpected ext: {ext} in {}", e.path.display());
    }
}

#[test]
fn scan_recurses_into_subdirectories() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images");
    let entries = scan_images(dir).expect("scan");
    // gradient_sub.jpg lives in subdir/ - must be found
    let sub = entries.iter().find(|e| e.path.ends_with("subdir/gradient_sub.jpg"));
    assert!(sub.is_some(), "should find image in subdirectory");
    // it's an exact copy of gradient.jpg
    let grad = entries.iter().find(|e| e.path.ends_with("gradient.jpg") && !e.path.to_str().unwrap().contains("subdir")).unwrap();
    let sub = sub.unwrap();
    assert_eq!(grad.sha256, sub.sha256, "exact copy should have same sha256");
    let groups = find_duplicate_groups(&entries, 8);
    assert!(groups.iter().any(|g| {
        g.kind == DuplicateKind::Exact
            && g.paths.iter().any(|p| p.ends_with("gradient.jpg") && !p.to_str().unwrap().contains("subdir"))
            && g.paths.iter().any(|p| p.ends_with("gradient_sub.jpg"))
    }), "should group gradient.jpg and subdir/gradient_sub.jpg as exact");
}

#[test]
fn single_image_no_duplicates() {
    let dir = Path::new("/a0/usr/projects/deduper/.a0proj/test_media/images/single");
    let entries = scan_images(dir).expect("scan");
    assert_eq!(entries.len(), 1, "should find exactly one image");
    let groups = find_duplicate_groups(&entries, 8);
    assert!(groups.is_empty(), "single image should produce no duplicate groups");
}

#[test]
fn cli_binary_reports_duplicates() {
    let bin = env!("CARGO_BIN_EXE_deduper");
    let output = std::process::Command::new(bin)
        .arg("/a0/usr/projects/deduper/.a0proj/test_media/images")
        .arg("8")
        .output()
        .expect("failed to run deduper binary");
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(output.status.success(), "binary should exit 0");
    assert!(stdout.contains("[exact]"), "output should contain exact groups: {stdout}");
    assert!(stdout.contains("[similar]"), "output should contain similar groups: {stdout}");
}