use std::fs;
use std::path::PathBuf;
use std::sync::Arc;

use pinakes_core::integrity::detect_orphans;
use pinakes_core::media_type::{BuiltinMediaType, MediaType};
use pinakes_core::model::{ContentHash, MediaId, MediaItem};
use pinakes_core::storage::{DynStorageBackend, StorageBackend, sqlite::SqliteBackend};
use tempfile::TempDir;
use uuid::Uuid;

async fn setup_test_storage() -> (DynStorageBackend, TempDir) {
    let temp_dir = TempDir::new().unwrap();
    let db_path = temp_dir.path().join(format!("test_{}.db", Uuid::now_v7()));

    let storage = SqliteBackend::new(&db_path).unwrap();
    storage.run_migrations().await.unwrap();

    (Arc::new(storage), temp_dir)
}

fn create_test_media_item(path: PathBuf, hash: &str) -> MediaItem {
    use std::collections::HashMap;

    MediaItem {
        id: MediaId(Uuid::now_v7()),
        path,
        file_name: "test.mp3".to_string(),
        media_type: MediaType::Builtin(BuiltinMediaType::Mp3),
        content_hash: ContentHash(hash.to_string()),
        file_size: 1000,
        title: None,
        artist: None,
        album: None,
        genre: None,
        year: None,
        duration_secs: None,
        description: None,
        thumbnail_path: None,
        custom_fields: HashMap::new(),
        file_mtime: None,
        date_taken: None,
        latitude: None,
        longitude: None,
        camera_make: None,
        camera_model: None,
        rating: None,
        perceptual_hash: None,
        created_at: chrono::Utc::now(),
        updated_at: chrono::Utc::now(),
    }
}

#[tokio::test]
async fn test_detect_orphaned_files() {
    let (storage, temp_dir) = setup_test_storage().await;

    // Create a media item pointing to a file that doesn't exist
    let nonexistent_path = temp_dir.path().join("nonexistent.mp3");
    let orphaned_item = create_test_media_item(nonexistent_path, "hash1");

    storage.insert_media(&orphaned_item).await.unwrap();

    // Detect orphans
    let report = detect_orphans(&storage).await.unwrap();

    // Should detect the orphaned file
    assert_eq!(report.orphaned_ids.len(), 1);
    assert_eq!(report.orphaned_ids[0], orphaned_item.id);
}

#[tokio::test]
async fn test_detect_untracked_files() {
    let (storage, temp_dir) = setup_test_storage().await;

    // Create a root directory
    let root_dir = temp_dir.path().join("media");
    fs::create_dir(&root_dir).unwrap();
    storage.add_root_dir(root_dir.clone()).await.unwrap();

    // Create actual files on disk
    let tracked_file = root_dir.join("tracked.mp3");
    let untracked_file = root_dir.join("untracked.mp3");

    fs::write(&tracked_file, b"tracked content").unwrap();
    fs::write(&untracked_file, b"untracked content").unwrap();

    // Add only one file to the database
    let tracked_item = create_test_media_item(tracked_file.clone(), "hash_tracked");
    storage.insert_media(&tracked_item).await.unwrap();

    // Detect orphans (including untracked files)
    let report = detect_orphans(&storage).await.unwrap();

    // Should detect the untracked file
    assert_eq!(report.untracked_paths.len(), 1);
    assert!(report.untracked_paths.contains(&untracked_file));
}

#[tokio::test]
async fn test_detect_moved_files() {
    // Note: Due to UNIQUE constraint on content_hash, moved files detection
    // won't find true duplicates. This test validates the detection logic
    // works but won't find matches due to schema constraints.

    let (storage, temp_dir) = setup_test_storage().await;

    // Create files
    let old_path = temp_dir.path().join("old_location.mp3");

    fs::write(&old_path, b"content").unwrap();

    // Create media item
    let old_item = create_test_media_item(old_path.clone(), "hash_unique");
    storage.insert_media(&old_item).await.unwrap();

    // Delete the file to make it orphaned
    fs::remove_file(&old_path).unwrap();

    // Detect orphans
    let report = detect_orphans(&storage).await.unwrap();

    // Should detect the orphaned file, but no moved files (no duplicates exist)
    assert_eq!(report.orphaned_ids.len(), 1);
    // With UNIQUE constraint on content_hash, we can't have duplicates,
    // so moved_files will be empty
    assert_eq!(report.moved_files.len(), 0);
}

#[tokio::test]
async fn test_ignore_patterns_respected() {
    let (storage, temp_dir) = setup_test_storage().await;

    // Create a root directory
    let root_dir = temp_dir.path().join("media");
    fs::create_dir(&root_dir).unwrap();
    storage.add_root_dir(root_dir.clone()).await.unwrap();

    // Create a hidden directory that should be ignored
    let hidden_dir = root_dir.join(".hidden");
    fs::create_dir(&hidden_dir).unwrap();

    let hidden_file = hidden_dir.join("hidden.mp3");
    fs::write(&hidden_file, b"hidden content").unwrap();

    // Create a normal file
    let normal_file = root_dir.join("normal.mp3");
    fs::write(&normal_file, b"normal content").unwrap();

    // Detect orphans
    let report = detect_orphans(&storage).await.unwrap();

    // Should only detect the normal file, not the hidden one
    assert_eq!(report.untracked_paths.len(), 1);
    assert!(report.untracked_paths.contains(&normal_file));
    assert!(!report.untracked_paths.contains(&hidden_file));
}

#[tokio::test]
async fn test_only_supported_media_types() {
    let (storage, temp_dir) = setup_test_storage().await;

    // Create a root directory
    let root_dir = temp_dir.path().join("media");
    fs::create_dir(&root_dir).unwrap();
    storage.add_root_dir(root_dir.clone()).await.unwrap();

    // Create files with different extensions
    let mp3_file = root_dir.join("audio.mp3");
    let txt_file = root_dir.join("readme.txt");
    let exe_file = root_dir.join("program.exe");

    fs::write(&mp3_file, b"audio").unwrap();
    fs::write(&txt_file, b"text").unwrap();
    fs::write(&exe_file, b"binary").unwrap();

    // Detect orphans
    let report = detect_orphans(&storage).await.unwrap();

    // Should only detect supported media types (mp3 and txt are supported)
    // exe should not be detected
    assert!(report.untracked_paths.len() <= 2);
    assert!(!report.untracked_paths.contains(&exe_file));
}

#[tokio::test]
async fn test_complete_orphan_workflow() {
    let (storage, temp_dir) = setup_test_storage().await;

    // Setup root directory
    let root_dir = temp_dir.path().join("media");
    fs::create_dir(&root_dir).unwrap();
    storage.add_root_dir(root_dir.clone()).await.unwrap();

    // Create various scenarios

    // 1. Orphaned file (in DB, not on disk)
    let orphaned_path = root_dir.join("orphaned.mp3");
    let orphaned_item = create_test_media_item(orphaned_path.clone(), "hash_orphaned");
    storage.insert_media(&orphaned_item).await.unwrap();

    // 2. Untracked file (on disk, not in DB)
    let untracked_path = root_dir.join("untracked.mp3");
    fs::write(&untracked_path, b"untracked").unwrap();

    // 3. Another orphaned file (can't test moved files with UNIQUE constraint)
    let another_orphaned = root_dir.join("another_orphaned.mp3");
    let another_item = create_test_media_item(another_orphaned.clone(), "hash_another");
    storage.insert_media(&another_item).await.unwrap();
    // Don't create the file, so it's orphaned

    // 4. Tracked file (normal case)
    let tracked_path = root_dir.join("tracked.mp3");
    fs::write(&tracked_path, b"tracked").unwrap();

    let tracked_item = create_test_media_item(tracked_path.clone(), "hash_tracked");
    storage.insert_media(&tracked_item).await.unwrap();

    // Detect all orphans
    let report = detect_orphans(&storage).await.unwrap();

    // Verify results
    assert_eq!(report.orphaned_ids.len(), 2); // orphaned + another_orphaned
    assert!(report.orphaned_ids.contains(&orphaned_item.id));
    assert!(report.orphaned_ids.contains(&another_item.id));

    assert_eq!(report.untracked_paths.len(), 1);
    assert!(report.untracked_paths.contains(&untracked_path));

    // No moved files due to UNIQUE constraint on content_hash
    assert_eq!(report.moved_files.len(), 0);
}

#[tokio::test]
async fn test_large_directory_performance() {
    let (storage, temp_dir) = setup_test_storage().await;

    let root_dir = temp_dir.path().join("media");
    fs::create_dir(&root_dir).unwrap();
    storage.add_root_dir(root_dir.clone()).await.unwrap();

    // Create many files
    for i in 0..1000 {
        let file_path = root_dir.join(format!("file_{}.mp3", i));
        fs::write(&file_path, format!("content {}", i)).unwrap();
    }

    // Add half to database
    for i in 0..500 {
        let file_path = root_dir.join(format!("file_{}.mp3", i));
        let item = create_test_media_item(file_path, &format!("hash_{}", i));
        storage.insert_media(&item).await.unwrap();
    }

    // Measure time
    let start = std::time::Instant::now();
    let report = detect_orphans(&storage).await.unwrap();
    let elapsed = start.elapsed();

    // Should complete in reasonable time (< 5 seconds for 1000 files)
    assert!(
        elapsed.as_secs() < 5,
        "Detection took too long: {:?}",
        elapsed
    );

    // Should detect 500 untracked files
    assert_eq!(report.untracked_paths.len(), 500);
}