//! E2E integration tests using real MinIO
//!
//! Prerequisites:
//! - MinIO must be running: docker-compose up -d minio
//! - Credentials: foxhunt_test / foxhunt_test_password
//! - Endpoint: http://localhost:9000
//!
//! These tests verify the full storage stack against a real S3-compatible backend.

use std::sync::Arc;

use storage::object_store_backend::ObjectStoreBackend;
use storage::Storage;

const TEST_BUCKET: &str = "test-bucket";

/// Helper to create MinIO backend for testing
async fn create_minio_backend() -> ObjectStoreBackend {
    storage::object_store_backend::test_helpers::new_for_minio_testing(TEST_BUCKET.to_string())
        .await
        .expect("Failed to create MinIO backend - is MinIO running?")
}

/// Test basic store and retrieve operations
#[tokio::test]
#[ignore = "Run with: cargo test --test minio_e2e_tests -- --ignored"]
async fn test_minio_store_and_retrieve() {
    let backend = create_minio_backend().await;

    let test_data = b"Hello MinIO!";
    let path = "test/basic.txt";

    // Store
    backend
        .store(path, test_data)
        .await
        .expect("Failed to store data");

    // Retrieve
    let retrieved = backend
        .retrieve(path)
        .await
        .expect("Failed to retrieve data");

    assert_eq!(
        retrieved, test_data,
        "Retrieved data should match stored data"
    );

    // Cleanup
    let deleted = backend.delete(path).await.expect("Failed to delete");
    assert!(deleted, "File should be deleted");
}

/// Test exists operation
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_exists() {
    let backend = create_minio_backend().await;

    let path = "test/exists.txt";

    // Should not exist initially
    let exists_before = backend.exists(path).await.expect("exists() failed");
    assert!(!exists_before, "File should not exist before storing");

    // Store file
    backend.store(path, b"test").await.expect("store() failed");

    // Should exist now
    let exists_after = backend.exists(path).await.expect("exists() failed");
    assert!(exists_after, "File should exist after storing");

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}

/// Test delete operation
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_delete() {
    let backend = create_minio_backend().await;

    let path = "test/delete.txt";

    // Store file
    backend
        .store(path, b"to be deleted")
        .await
        .expect("store() failed");

    // Delete should succeed
    let deleted = backend.delete(path).await.expect("delete() failed");
    assert!(deleted, "Delete should return true for existing file");

    // Delete non-existent should return false
    let deleted_again = backend.delete(path).await.expect("delete() failed");
    assert!(
        !deleted_again,
        "Delete should return false for non-existent file"
    );
}

/// Test list operation
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_list() {
    let backend = create_minio_backend().await;

    let prefix = "test/list/";

    // Store multiple files
    for i in 0..3 {
        let path = format!("{}file{}.txt", prefix, i);
        backend
            .store(&path, format!("content {}", i).as_bytes())
            .await
            .expect("store() failed");
    }

    // List files
    let files = backend.list(prefix).await.expect("list() failed");
    assert!(files.len() >= 3, "Should list at least 3 files");

    // Cleanup
    for file in files {
        backend.delete(&file).await.expect("delete() failed");
    }
}

/// Test metadata operation
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_metadata() {
    let backend = create_minio_backend().await;

    let path = "test/metadata.txt";
    let test_data = b"metadata test content";

    // Store file
    backend
        .store(path, test_data)
        .await
        .expect("store() failed");

    // Get metadata
    let metadata = backend.metadata(path).await.expect("metadata() failed");

    assert_eq!(metadata.path, path);
    assert_eq!(metadata.size, test_data.len() as u64);
    assert!(metadata.etag.is_some(), "ETag should be present");

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}

/// Test large file upload and download
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_large_file() {
    let backend = create_minio_backend().await;

    let path = "test/large.bin";
    // 5MB test file
    let test_data: Vec<u8> = (0..5_000_000).map(|i| (i % 256) as u8).collect();

    // Store
    backend
        .store(path, &test_data)
        .await
        .expect("store() failed");

    // Retrieve
    let retrieved = backend.retrieve(path).await.expect("retrieve() failed");

    assert_eq!(retrieved.len(), test_data.len(), "Size should match");
    assert_eq!(retrieved, test_data, "Content should match");

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}

/// Test download with progress callback
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_download_with_progress() {
    let backend = create_minio_backend().await;

    let path = "test/progress.txt";
    let test_data = b"Progress tracking test";

    // Store file
    backend
        .store(path, test_data)
        .await
        .expect("store() failed");

    // Track progress
    let progress_calls = Arc::new(std::sync::atomic::AtomicUsize::new(0));
    let progress_calls_clone = Arc::clone(&progress_calls);

    let callback = Arc::new(move |downloaded: u64, total: u64| {
        progress_calls_clone.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
        println!("Downloaded: {} / {} bytes", downloaded, total);
    });

    // Download with progress
    let retrieved = backend
        .download_with_progress(path, Some(callback))
        .await
        .expect("download_with_progress() failed");

    assert_eq!(retrieved, test_data);
    assert!(
        progress_calls.load(std::sync::atomic::Ordering::SeqCst) >= 2,
        "Progress callback should be called at least twice"
    );

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}

/// Test streaming download with progress
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_stream_download_with_progress() {
    let backend = create_minio_backend().await;

    let path = "test/stream.txt";
    let test_data = b"Streaming download test data";

    // Store file
    backend
        .store(path, test_data)
        .await
        .expect("store() failed");

    // Track progress
    let progress_calls = Arc::new(std::sync::atomic::AtomicUsize::new(0));
    let progress_calls_clone = Arc::clone(&progress_calls);

    let callback = Arc::new(move |downloaded: u64, total: u64| {
        progress_calls_clone.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
        println!("Stream downloaded: {} / {} bytes", downloaded, total);
    });

    // Stream download with progress
    let retrieved = backend
        .stream_download_with_progress(path, 1024, callback)
        .await
        .expect("stream_download_with_progress() failed");

    assert_eq!(retrieved, test_data);
    assert!(
        progress_calls.load(std::sync::atomic::Ordering::SeqCst) > 0,
        "Progress callback should be called"
    );

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}

/// Test parallel download
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_parallel_download() {
    let backend = create_minio_backend().await;

    let prefix = "test/parallel/";

    // Store multiple files
    let mut paths = Vec::new();
    for i in 0..5 {
        let path = format!("{}file{}.txt", prefix, i);
        backend
            .store(&path, format!("content {}", i).as_bytes())
            .await
            .expect("store() failed");
        paths.push(path);
    }

    // Parallel download
    let results = backend
        .parallel_download(paths.clone(), None)
        .await
        .expect("parallel_download() failed");

    assert_eq!(results.len(), 5, "Should download all 5 files");

    for (i, (path, data)) in results.iter().enumerate() {
        let expected_content = format!("content {}", i);
        assert_eq!(
            std::str::from_utf8(data).unwrap(),
            expected_content,
            "Content should match for {}",
            path
        );
    }

    // Cleanup
    for path in paths {
        backend.delete(&path).await.expect("delete() failed");
    }
}

/// Test path helpers
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_path_helpers() {
    let backend = create_minio_backend().await;

    // Test model path
    let model_path = backend.get_model_path("mamba2", "v1.0", "model.safetensors");
    assert_eq!(model_path, "models/mamba2/v1.0/model.safetensors");

    // Test checkpoint path
    let checkpoint_path = backend.get_checkpoint_path("dqn", "checkpoint_001");
    assert_eq!(checkpoint_path, "models/dqn/checkpoints/checkpoint_001");

    // Test metadata path
    let metadata_path = backend.get_metadata_path("tft", "v2.1");
    assert_eq!(metadata_path, "models/tft/v2.1/metadata.json");
}

/// Test error handling - non-existent file
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_error_not_found() {
    let backend = create_minio_backend().await;

    let result = backend.retrieve("nonexistent/file.txt").await;
    assert!(result.is_err(), "Should fail for non-existent file");
}

/// Test concurrent operations
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_concurrent_operations() {
    let backend = Arc::new(create_minio_backend().await);

    let mut handles = vec![];

    for i in 0..10 {
        let backend = Arc::clone(&backend);
        let handle = tokio::spawn(async move {
            let path = format!("test/concurrent/file{}.txt", i);
            let data = format!("content {}", i);

            // Store
            backend.store(&path, data.as_bytes()).await?;

            // Retrieve
            let retrieved = backend.retrieve(&path).await?;
            assert_eq!(retrieved, data.as_bytes());

            // Delete
            backend.delete(&path).await?;

            Ok::<(), storage::error::StorageError>(())
        });
        handles.push(handle);
    }

    // Wait for all operations
    for handle in handles {
        handle
            .await
            .expect("Task panicked")
            .expect("Operation failed");
    }
}

/// Test empty file handling
#[tokio::test]
#[ignore = "Requires MinIO - run with --ignored"]
async fn test_minio_empty_file() {
    let backend = create_minio_backend().await;

    let path = "test/empty.txt";
    let empty_data: &[u8] = b"";

    // Store empty file
    backend
        .store(path, empty_data)
        .await
        .expect("store() failed");

    // Retrieve empty file
    let retrieved = backend.retrieve(path).await.expect("retrieve() failed");
    assert_eq!(
        retrieved, empty_data,
        "Empty file should be handled correctly"
    );

    // Cleanup
    backend.delete(path).await.expect("delete() failed");
}