//! Integration tests for LightningSTOR server
//!
//! Run with: cargo test -p lightningstor-server --test integration -- --ignored
//! Requires: LIGHTNINGSTOR_TEST=1 environment variable

use bytes::Bytes;
use lightningstor_server::metadata::MetadataStore;
use lightningstor_storage::{LocalFsBackend, StorageBackend};
use lightningstor_types::{Bucket, BucketName, Object, ObjectKey};
use std::sync::Arc;
use tempfile::TempDir;

/// Test helper to create a test environment
struct TestEnv {
    storage: Arc<LocalFsBackend>,
    metadata: Arc<MetadataStore>,
    _temp_dir: TempDir,
}

impl TestEnv {
    async fn new() -> Self {
        let temp_dir = TempDir::new().expect("Failed to create temp dir");
        let data_path = temp_dir.path().to_str().unwrap();

        let storage = Arc::new(
            LocalFsBackend::new(data_path)
                .await
                .expect("Failed to create storage backend"),
        );

        // Use in-memory metadata store for testing (no ChainFire required)
        let metadata = Arc::new(MetadataStore::new_in_memory());

        Self {
            storage,
            metadata,
            _temp_dir: temp_dir,
        }
    }
}

// =============================================================================
// gRPC-style Flow Tests (using services directly)
// =============================================================================

#[tokio::test]
#[ignore = "Integration test - run with LIGHTNINGSTOR_TEST=1"]
async fn test_bucket_lifecycle() {
    let env = TestEnv::new().await;

    let org_id = "test-org";
    let project_id = "test-project";
    let bucket_name = "test-bucket";

    // Create bucket
    let bucket_name_obj = BucketName::new(bucket_name).expect("Invalid bucket name");
    let bucket = Bucket::new(bucket_name_obj, org_id, project_id, "us-east-1");

    env.metadata
        .save_bucket(&bucket)
        .await
        .expect("Failed to save bucket");

    // Verify bucket exists
    let loaded = env
        .metadata
        .load_bucket(org_id, project_id, bucket_name)
        .await
        .expect("Failed to load bucket")
        .expect("Bucket not found");

    assert_eq!(loaded.name.as_str(), bucket_name);
    assert_eq!(loaded.org_id, org_id);
    assert_eq!(loaded.project_id, project_id);

    // List buckets
    let buckets = env
        .metadata
        .list_buckets(org_id, None)
        .await
        .expect("Failed to list buckets");

    assert_eq!(buckets.len(), 1);
    assert_eq!(buckets[0].name.as_str(), bucket_name);

    // Delete bucket
    env.metadata
        .delete_bucket(&loaded)
        .await
        .expect("Failed to delete bucket");

    // Verify bucket is gone
    let deleted = env
        .metadata
        .load_bucket(org_id, project_id, bucket_name)
        .await
        .expect("Failed to check bucket");

    assert!(deleted.is_none(), "Bucket should be deleted");

    println!("✓ Bucket lifecycle test passed");
}

#[tokio::test]
#[ignore = "Integration test - run with LIGHTNINGSTOR_TEST=1"]
async fn test_object_lifecycle() {
    let env = TestEnv::new().await;

    let org_id = "test-org";
    let project_id = "test-project";
    let bucket_name = "test-bucket";
    let object_key = "test/object.txt";
    let object_content = b"Hello, LightningSTOR!";

    // Create bucket first
    let bucket_name_obj = BucketName::new(bucket_name).expect("Invalid bucket name");
    let bucket = Bucket::new(bucket_name_obj, org_id, project_id, "us-east-1");
    env.metadata
        .save_bucket(&bucket)
        .await
        .expect("Failed to save bucket");

    // Create object
    let object_key_obj = ObjectKey::new(object_key).expect("Invalid object key");

    // Calculate ETag
    use md5::{Digest, Md5};
    let mut hasher = Md5::new();
    hasher.update(object_content);
    let hash = hasher.finalize();
    let hash_array: [u8; 16] = hash.into();
    let etag = lightningstor_types::ETag::from_md5(&hash_array);

    let object = Object::new(
        bucket.id.to_string(),
        object_key_obj,
        etag.clone(),
        object_content.len() as u64,
        Some("text/plain".to_string()),
    );

    // Store object data
    env.storage
        .put_object(&object.id, Bytes::from(object_content.to_vec()))
        .await
        .expect("Failed to store object data");

    // Save object metadata
    env.metadata
        .save_object(&object)
        .await
        .expect("Failed to save object metadata");

    // Verify object exists
    let loaded = env
        .metadata
        .load_object(&bucket.id, object_key, None)
        .await
        .expect("Failed to load object")
        .expect("Object not found");

    assert_eq!(loaded.key.as_str(), object_key);
    assert_eq!(loaded.size, object_content.len() as u64);
    assert_eq!(loaded.etag.as_str(), etag.as_str());

    // Get object data
    let data = env
        .storage
        .get_object(&loaded.id)
        .await
        .expect("Failed to get object data");

    assert_eq!(data.as_ref(), object_content);

    // List objects
    let objects = env
        .metadata
        .list_objects(&bucket.id, "", 1000)
        .await
        .expect("Failed to list objects");

    assert_eq!(objects.len(), 1);
    assert_eq!(objects[0].key.as_str(), object_key);

    // Delete object
    env.storage
        .delete_object(&loaded.id)
        .await
        .expect("Failed to delete object data");

    env.metadata
        .delete_object(&bucket.id, object_key, None)
        .await
        .expect("Failed to delete object metadata");

    // Verify object is gone
    let deleted = env
        .metadata
        .load_object(&bucket.id, object_key, None)
        .await
        .expect("Failed to check object");

    assert!(deleted.is_none(), "Object should be deleted");

    // Cleanup bucket
    env.metadata
        .delete_bucket(&bucket)
        .await
        .expect("Failed to delete bucket");

    println!("✓ Object lifecycle test passed");
}

#[tokio::test]
#[ignore = "Integration test - run with LIGHTNINGSTOR_TEST=1"]
async fn test_full_crud_cycle() {
    let env = TestEnv::new().await;

    println!("Starting full CRUD cycle test...");

    let org_id = "crud-org";
    let project_id = "crud-project";

    // 1. Create multiple buckets
    for i in 1..=3 {
        let name = format!("bucket-{:03}", i);
        let bucket_name = BucketName::new(&name).unwrap();
        let bucket = Bucket::new(bucket_name, org_id, project_id, "us-west-2");
        env.metadata.save_bucket(&bucket).await.unwrap();
        println!("  Created bucket: {}", name);
    }

    // 2. Verify all buckets exist
    let buckets = env.metadata.list_buckets(org_id, None).await.unwrap();
    assert_eq!(buckets.len(), 3);
    println!("  Verified {} buckets exist", buckets.len());

    // 3. Add objects to first bucket
    let bucket = &buckets[0];
    let test_objects = vec![
        ("docs/readme.md", "# README\nThis is a test."),
        ("docs/guide.md", "# Guide\nStep by step instructions."),
        ("images/logo.png", "PNG_BINARY_DATA_PLACEHOLDER"),
        ("data/config.json", r#"{"key": "value"}"#),
    ];

    for (key, content) in &test_objects {
        let object_key = ObjectKey::new(*key).unwrap();

        use md5::{Digest, Md5};
        let mut hasher = Md5::new();
        hasher.update(content.as_bytes());
        let hash = hasher.finalize();
        let hash_array: [u8; 16] = hash.into();
        let etag = lightningstor_types::ETag::from_md5(&hash_array);

        let object = Object::new(
            bucket.id.to_string(),
            object_key,
            etag,
            content.len() as u64,
            Some("text/plain".to_string()),
        );

        env.storage
            .put_object(&object.id, Bytes::from(content.as_bytes().to_vec()))
            .await
            .unwrap();
        env.metadata.save_object(&object).await.unwrap();
        println!("  Created object: {}", key);
    }

    // 4. List all objects
    let objects = env.metadata.list_objects(&bucket.id, "", 1000).await.unwrap();
    assert_eq!(objects.len(), test_objects.len());
    println!("  Verified {} objects exist", objects.len());

    // 5. List with prefix filter
    let docs = env.metadata.list_objects(&bucket.id, "docs/", 1000).await.unwrap();
    assert_eq!(docs.len(), 2);
    println!("  Prefix filter 'docs/' returned {} objects", docs.len());

    // 6. Read back each object and verify content
    for (key, expected_content) in &test_objects {
        let obj = env
            .metadata
            .load_object(&bucket.id, key, None)
            .await
            .unwrap()
            .expect("Object not found");

        let data = env.storage.get_object(&obj.id).await.unwrap();
        assert_eq!(data.as_ref(), expected_content.as_bytes());
        println!("  Verified content of: {}", key);
    }

    // 7. Delete all objects
    for obj in &objects {
        env.storage.delete_object(&obj.id).await.unwrap();
        env.metadata
            .delete_object(&bucket.id, obj.key.as_str(), None)
            .await
            .unwrap();
    }
    println!("  Deleted all objects");

    // 8. Verify objects are gone
    let remaining = env.metadata.list_objects(&bucket.id, "", 1000).await.unwrap();
    assert_eq!(remaining.len(), 0);
    println!("  Verified all objects deleted");

    // 9. Delete all buckets
    for bucket in &buckets {
        env.metadata.delete_bucket(bucket).await.unwrap();
    }
    println!("  Deleted all buckets");

    // 10. Verify buckets are gone
    let remaining_buckets = env.metadata.list_buckets(org_id, None).await.unwrap();
    assert_eq!(remaining_buckets.len(), 0);
    println!("  Verified all buckets deleted");

    println!("✓ Full CRUD cycle test passed");
}

// =============================================================================
// S3 HTTP Flow Tests (would require running server)
// =============================================================================

#[tokio::test]
#[ignore = "S3 HTTP test - requires running server"]
async fn test_s3_http_bucket_operations() {
    // This test would require:
    // 1. Starting the server in background
    // 2. Making HTTP requests via reqwest
    // 3. Verifying responses

    // For now, we rely on curl manual testing:
    // curl -X PUT http://localhost:9001/test-bucket
    // curl http://localhost:9001/
    // curl -X DELETE http://localhost:9001/test-bucket

    println!("S3 HTTP tests require running server - use curl for manual testing");
}

#[tokio::test]
#[ignore = "S3 HTTP test - requires running server"]
async fn test_s3_http_object_operations() {
    // Manual testing commands:
    // curl -X PUT http://localhost:9001/test-bucket
    // curl -X PUT -d "Hello World" http://localhost:9001/test-bucket/hello.txt
    // curl http://localhost:9001/test-bucket/hello.txt
    // curl -I http://localhost:9001/test-bucket/hello.txt
    // curl http://localhost:9001/test-bucket?prefix=
    // curl -X DELETE http://localhost:9001/test-bucket/hello.txt
    // curl -X DELETE http://localhost:9001/test-bucket

    println!("S3 HTTP tests require running server - use curl for manual testing");
}