//! Model Registry Integration Tests
//!
//! Comprehensive tests for the ML model versioning and registry system.

use ml::model_registry::{ModelRegistry, ModelVersionMetadata};
use ml::ModelType;

// Test database URL (requires PostgreSQL running)
const TEST_DB_URL: &str = "postgresql://foxhunt:foxhunt_dev_password@localhost:5432/foxhunt";
const TEST_S3_PATH: &str = "s3://foxhunt-ml-models-test/";

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_registry_initialization() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await;
    assert!(registry.is_ok(), "Failed to initialize registry: {:?}", registry.err());
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_register_and_retrieve_model() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Create metadata
    let mut metadata = ModelVersionMetadata::new(
        format!("dqn-test-{}", uuid::Uuid::new_v4()),
        ModelType::DQN,
        "1.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/dqn/1.0.0/".to_string(),
    );

    metadata.add_hyperparameter("epochs", serde_json::json!(500));
    metadata.add_metric("final_loss", serde_json::json!(0.001));
    metadata.set_checksum("sha256:test123".to_string());

    let model_id = metadata.model_id.clone();

    // Register
    registry.register_version(&metadata).await.unwrap();

    // Retrieve
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();

    assert_eq!(retrieved.model_id, model_id);
    assert_eq!(retrieved.version, "1.0.0");
    assert_eq!(retrieved.data_source, "test_data");
    assert_eq!(retrieved.checksum, "sha256:test123");
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_hyperparameters_and_metrics() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    let mut metadata = ModelVersionMetadata::new(
        format!("tft-test-{}", uuid::Uuid::new_v4()),
        ModelType::TFT,
        "2.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/tft/2.0.0/".to_string(),
    );

    // Add multiple hyperparameters
    metadata.add_hyperparameter("epochs", serde_json::json!(1000));
    metadata.add_hyperparameter("batch_size", serde_json::json!(256));
    metadata.add_hyperparameter("learning_rate", serde_json::json!(0.0001));
    metadata.add_hyperparameter("dropout", serde_json::json!(0.2));

    // Add multiple metrics
    metadata.add_metric("final_loss", serde_json::json!(0.0005));
    metadata.add_metric("validation_loss", serde_json::json!(0.0008));
    metadata.add_metric("sharpe_ratio", serde_json::json!(2.5));
    metadata.add_metric("max_drawdown", serde_json::json!(0.15));

    metadata.set_checksum("sha256:tft456".to_string());

    let model_id = metadata.model_id.clone();

    // Register
    registry.register_version(&metadata).await.unwrap();

    // Retrieve and verify
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();

    // Verify hyperparameters
    let hyperparams = retrieved.hyperparameters.as_object().unwrap();
    assert_eq!(hyperparams.get("epochs").unwrap(), &serde_json::json!(1000));
    assert_eq!(hyperparams.get("batch_size").unwrap(), &serde_json::json!(256));

    // Verify metrics
    let metrics = retrieved.metrics.as_object().unwrap();
    assert_eq!(metrics.get("final_loss").unwrap(), &serde_json::json!(0.0005));
    assert_eq!(metrics.get("sharpe_ratio").unwrap(), &serde_json::json!(2.5));
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_production_tagging() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    let metadata = ModelVersionMetadata::new(
        format!("mamba-test-{}", uuid::Uuid::new_v4()),
        ModelType::MAMBA,
        "1.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/mamba/1.0.0/".to_string(),
    );

    let model_id = metadata.model_id.clone();

    // Register as experimental
    registry.register_version(&metadata).await.unwrap();

    // Verify experimental
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();
    assert!(retrieved.is_experimental);
    assert!(!retrieved.is_production);

    // Promote to production
    registry.mark_production(&model_id).await.unwrap();

    // Verify production
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();
    assert!(retrieved.is_production);
    assert!(!retrieved.is_experimental);
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_get_production_models() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Register a production model
    let mut metadata = ModelVersionMetadata::new(
        format!("dqn-prod-{}", uuid::Uuid::new_v4()),
        ModelType::DQN,
        "1.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/dqn/1.0.0/".to_string(),
    );
    metadata.set_checksum("sha256:prod123".to_string());

    let model_id = metadata.model_id.clone();
    registry.register_version(&metadata).await.unwrap();
    registry.mark_production(&model_id).await.unwrap();

    // Query production models
    let production_models = registry.get_production_models().await.unwrap();

    // Verify at least one production model exists
    assert!(!production_models.is_empty());

    // Verify all returned models are production
    for model in &production_models {
        assert!(model.is_production);
        assert!(!model.is_archived);
    }
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_get_models_by_type() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Register multiple PPO models
    for i in 0..3 {
        let metadata = ModelVersionMetadata::new(
            format!("ppo-test-{}-{}", i, uuid::Uuid::new_v4()),
            ModelType::PPO,
            format!("1.0.{}", i),
            "test_data".to_string(),
            format!("s3://test/ppo/1.0.{}/", i),
        );
        registry.register_version(&metadata).await.unwrap();
    }

    // Query PPO models
    let ppo_models = registry.get_models_by_type(ModelType::PPO).await.unwrap();

    // Verify at least 3 PPO models exist
    assert!(ppo_models.len() >= 3);

    // Verify all are PPO
    for model in &ppo_models {
        assert_eq!(model.model_type, ModelType::PPO);
    }
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_archive_model() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    let metadata = ModelVersionMetadata::new(
        format!("tlob-archive-{}", uuid::Uuid::new_v4()),
        ModelType::TLOB,
        "0.9.0".to_string(),
        "test_data".to_string(),
        "s3://test/tlob/0.9.0/".to_string(),
    );

    let model_id = metadata.model_id.clone();

    // Register
    registry.register_version(&metadata).await.unwrap();

    // Archive
    registry.archive_model(&model_id).await.unwrap();

    // Verify archived
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();
    assert!(retrieved.is_archived);
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_get_registry_statistics() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Get statistics
    let stats = registry.get_statistics().await.unwrap();

    // Verify basic stats structure
    assert!(stats.total_count >= 0);
    assert!(stats.production_count <= stats.total_count);
    assert!(stats.experimental_count <= stats.total_count);
    assert!(stats.archived_count <= stats.total_count);
    assert!(stats.model_types_count >= 0);
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_date_range_query() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Register a model
    let metadata = ModelVersionMetadata::new(
        format!("transformer-test-{}", uuid::Uuid::new_v4()),
        ModelType::Transformer,
        "1.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/transformer/1.0.0/".to_string(),
    );

    registry.register_version(&metadata).await.unwrap();

    // Query last 24 hours
    let now = chrono::Utc::now();
    let one_day_ago = now - chrono::Duration::days(1);

    let recent_models = registry.get_models_by_date_range(one_day_ago, now).await.unwrap();

    // Should find at least the model we just registered
    assert!(!recent_models.is_empty());
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_model_not_found_error() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Try to retrieve non-existent model
    let result = registry.get_model_by_version("nonexistent-model-xyz").await;

    assert!(result.is_err());
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_update_model_metadata() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    // Register initial version
    let mut metadata = ModelVersionMetadata::new(
        format!("ensemble-test-{}", uuid::Uuid::new_v4()),
        ModelType::Ensemble,
        "1.0.0".to_string(),
        "test_data_v1".to_string(),
        "s3://test/ensemble/1.0.0/".to_string(),
    );
    metadata.add_metric("accuracy", serde_json::json!(0.85));
    metadata.set_checksum("sha256:v1".to_string());

    let model_id = metadata.model_id.clone();
    registry.register_version(&metadata).await.unwrap();

    // Update with new data
    let mut updated_metadata = metadata.clone();
    updated_metadata.data_source = "test_data_v2".to_string();
    updated_metadata.add_metric("accuracy", serde_json::json!(0.90));
    updated_metadata.set_checksum("sha256:v2".to_string());

    registry.register_version(&updated_metadata).await.unwrap();

    // Verify update
    let retrieved = registry.get_model_by_version(&model_id).await.unwrap();
    assert_eq!(retrieved.data_source, "test_data_v2");
    assert_eq!(retrieved.checksum, "sha256:v2");
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_multiple_model_types() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    let model_types = vec![
        ModelType::DQN,
        ModelType::MAMBA,
        ModelType::TFT,
        ModelType::PPO,
        ModelType::TLOB,
        ModelType::Transformer,
    ];

    // Register one of each type
    for model_type in model_types {
        let metadata = ModelVersionMetadata::new(
            format!("{:?}-multi-{}", model_type, uuid::Uuid::new_v4()),
            model_type,
            "1.0.0".to_string(),
            "test_data".to_string(),
            format!("s3://test/{:?}/1.0.0/", model_type),
        );
        registry.register_version(&metadata).await.unwrap();
    }

    // Verify statistics
    let stats = registry.get_statistics().await.unwrap();
    assert!(stats.model_types_count >= 6);
}

#[tokio::test]
#[ignore] // Requires PostgreSQL
async fn test_cache_functionality() {
    let registry = ModelRegistry::new(TEST_DB_URL, TEST_S3_PATH).await.unwrap();

    let metadata = ModelVersionMetadata::new(
        format!("cache-test-{}", uuid::Uuid::new_v4()),
        ModelType::DQN,
        "1.0.0".to_string(),
        "test_data".to_string(),
        "s3://test/cache/1.0.0/".to_string(),
    );

    let model_id = metadata.model_id.clone();
    registry.register_version(&metadata).await.unwrap();

    // First retrieval (from database)
    let start1 = std::time::Instant::now();
    let _ = registry.get_model_by_version(&model_id).await.unwrap();
    let duration1 = start1.elapsed();

    // Second retrieval (from cache, should be faster)
    let start2 = std::time::Instant::now();
    let _ = registry.get_model_by_version(&model_id).await.unwrap();
    let duration2 = start2.elapsed();

    // Cache should be faster (not guaranteed but likely)
    println!("First retrieval: {:?}", duration1);
    println!("Second retrieval (cached): {:?}", duration2);
}