//! TDD Tests for `tli train list` Command
//!
//! **Test-First Approach (RED → GREEN → REFACTOR)**
//!
//! This test suite is written BEFORE implementation to drive development.
//! All tests should FAIL initially (RED), then PASS after implementation (GREEN).

#[cfg(test)]
mod train_list_tests {
    use fxt::commands::train::list::ListCommand;
    use fxt::proto::ml_training::{
        ml_training_service_client::MlTrainingServiceClient, ListTrainingJobsRequest,
        ListTrainingJobsResponse, TrainingJobSummary, TrainingStatus,
    };
    use tonic::{transport::Server, Request, Response, Status};

    /// Mock ML Training Service for testing
    #[derive(Default)]
    struct MockMlTrainingService {
        jobs: Vec<TrainingJobSummary>,
    }

    #[tonic::async_trait]
    impl tli::proto::ml_training::ml_training_service_server::MlTrainingService
        for MockMlTrainingService
    {
        async fn list_training_jobs(
            &self,
            _request: Request<ListTrainingJobsRequest>,
        ) -> Result<Response<ListTrainingJobsResponse>, Status> {
            Ok(Response::new(ListTrainingJobsResponse {
                jobs: self.jobs.clone(),
                total_count: self.jobs.len() as u32,
                page: 1,
                page_size: 50,
            }))
        }

        // Stub implementations for other required methods
        async fn start_training(
            &self,
            _request: Request<tli::proto::ml_training::StartTrainingRequest>,
        ) -> Result<Response<tli::proto::ml_training::StartTrainingResponse>, Status> {
            unimplemented!()
        }

        async fn subscribe_to_training_status(
            &self,
            _request: Request<tli::proto::ml_training::SubscribeToTrainingStatusRequest>,
        ) -> Result<
            Response<
                tonic::codec::Streaming<tli::proto::ml_training::TrainingStatusUpdate>,
            >,
            Status,
        > {
            unimplemented!()
        }

        async fn stop_training(
            &self,
            _request: Request<tli::proto::ml_training::StopTrainingRequest>,
        ) -> Result<Response<tli::proto::ml_training::StopTrainingResponse>, Status> {
            unimplemented!()
        }

        async fn list_available_models(
            &self,
            _request: Request<tli::proto::ml_training::ListAvailableModelsRequest>,
        ) -> Result<Response<tli::proto::ml_training::ListAvailableModelsResponse>, Status>
        {
            unimplemented!()
        }

        async fn get_training_job_details(
            &self,
            _request: Request<tli::proto::ml_training::GetTrainingJobDetailsRequest>,
        ) -> Result<Response<tli::proto::ml_training::GetTrainingJobDetailsResponse>, Status>
        {
            unimplemented!()
        }

        async fn health_check(
            &self,
            _request: Request<tli::proto::ml_training::HealthCheckRequest>,
        ) -> Result<Response<tli::proto::ml_training::HealthCheckResponse>, Status> {
            unimplemented!()
        }

        async fn start_tuning_job(
            &self,
            _request: Request<tli::proto::ml_training::StartTuningJobRequest>,
        ) -> Result<Response<tli::proto::ml_training::StartTuningJobResponse>, Status> {
            unimplemented!()
        }

        async fn get_tuning_job_status(
            &self,
            _request: Request<tli::proto::ml_training::GetTuningJobStatusRequest>,
        ) -> Result<Response<tli::proto::ml_training::GetTuningJobStatusResponse>, Status>
        {
            unimplemented!()
        }

        async fn stop_tuning_job(
            &self,
            _request: Request<tli::proto::ml_training::StopTuningJobRequest>,
        ) -> Result<Response<tli::proto::ml_training::StopTuningJobResponse>, Status> {
            unimplemented!()
        }

        async fn train_model(
            &self,
            _request: Request<tli::proto::ml_training::TrainModelRequest>,
        ) -> Result<Response<tli::proto::ml_training::TrainModelResponse>, Status> {
            unimplemented!()
        }

        async fn stream_tuning_progress(
            &self,
            _request: Request<tli::proto::ml_training::StreamProgressRequest>,
        ) -> Result<
            Response<tonic::codec::Streaming<tli::proto::ml_training::ProgressUpdate>>,
            Status,
        > {
            unimplemented!()
        }

        async fn batch_start_tuning_jobs(
            &self,
            _request: Request<tli::proto::ml_training::BatchStartTuningJobsRequest>,
        ) -> Result<Response<tli::proto::ml_training::BatchStartTuningJobsResponse>, Status>
        {
            unimplemented!()
        }

        async fn get_batch_tuning_status(
            &self,
            _request: Request<tli::proto::ml_training::GetBatchTuningStatusRequest>,
        ) -> Result<Response<tli::proto::ml_training::GetBatchTuningStatusResponse>, Status>
        {
            unimplemented!()
        }

        async fn stop_batch_tuning_job(
            &self,
            _request: Request<tli::proto::ml_training::StopBatchTuningJobRequest>,
        ) -> Result<Response<tli::proto::ml_training::StopBatchTuningJobResponse>, Status>
        {
            unimplemented!()
        }
    }

    /// Helper function to create test job
    fn create_test_job(
        job_id: &str,
        model_type: &str,
        status: TrainingStatus,
        created_at: i64,
        started_at: i64,
        completed_at: i64,
    ) -> TrainingJobSummary {
        TrainingJobSummary {
            job_id: job_id.to_string(),
            model_type: model_type.to_string(),
            status: status as i32,
            created_at,
            started_at,
            completed_at,
            description: format!("Test {} job", model_type),
            final_loss: 0.123,
            best_validation_score: 0.456,
            tags: vec![("env".to_string(), "test".to_string())]
                .into_iter()
                .collect(),
        }
    }

    /// TEST 1: List all jobs (default behavior - last 50 jobs)
    #[tokio::test]
    async fn test_list_all_jobs_default() {
        // Arrange: Create mock jobs
        let jobs = vec![
            create_test_job(
                "batch_multi_20251022_140000",
                "BATCH",
                TrainingStatus::Running,
                1729602000,
                1729602060,
                0,
            ),
            create_test_job(
                "train_tft_es_20251022_133000",
                "TFT",
                TrainingStatus::Completed,
                1729600200,
                1729600260,
                1729600464,
            ),
            create_test_job(
                "train_ppo_nq_20251022_130000",
                "PPO",
                TrainingStatus::Completed,
                1729598400,
                1729598460,
                1729598467,
            ),
        ];

        let mock_service = MockMlTrainingService {
            jobs: jobs.clone(),
        };

        // Act: Create command and execute
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert: Should list all jobs
        // NOTE: This will FAIL until implementation exists
        assert_eq!(jobs.len(), 3);
        assert_eq!(cmd.limit, 50);
    }

    /// TEST 2: Filter by status (RUNNING)
    #[tokio::test]
    async fn test_filter_by_status_running() {
        // Arrange
        let cmd = ListCommand {
            status: Some("RUNNING".to_string()),
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.status, Some("RUNNING".to_string()));
    }

    /// TEST 3: Filter by model type (TFT)
    #[tokio::test]
    async fn test_filter_by_model_tft() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: Some("TFT".to_string()),
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.model, Some("TFT".to_string()));
    }

    /// TEST 4: Filter by asset (ES.FUT)
    #[tokio::test]
    async fn test_filter_by_asset() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: Some("ES.FUT".to_string()),
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.asset, Some("ES.FUT".to_string()));
    }

    /// TEST 5: Sort by start time (newest first)
    #[tokio::test]
    async fn test_sort_by_start_time_desc() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.sort_by, "start_time");
        assert_eq!(cmd.sort_order, "desc");
    }

    /// TEST 6: Sort by start time (oldest first)
    #[tokio::test]
    async fn test_sort_by_start_time_asc() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "asc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.sort_order, "asc");
    }

    /// TEST 7: Sort by duration
    #[tokio::test]
    async fn test_sort_by_duration() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "duration".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.sort_by, "duration");
    }

    /// TEST 8: Limit results to 10
    #[tokio::test]
    async fn test_limit_results() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 10,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.limit, 10);
    }

    /// TEST 9: Show only batch jobs
    #[tokio::test]
    async fn test_batch_only_filter() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: true,
            single_only: false,
        };

        // Assert
        assert!(cmd.batch_only);
        assert!(!cmd.single_only);
    }

    /// TEST 10: Show only single-model jobs
    #[tokio::test]
    async fn test_single_only_filter() {
        // Arrange
        let cmd = ListCommand {
            status: None,
            model: None,
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: true,
        };

        // Assert
        assert!(cmd.single_only);
        assert!(!cmd.batch_only);
    }

    /// TEST 11: Combined filters (status + model)
    #[tokio::test]
    async fn test_combined_filters() {
        // Arrange
        let cmd = ListCommand {
            status: Some("RUNNING".to_string()),
            model: Some("TFT".to_string()),
            asset: None,
            sort_by: "start_time".to_string(),
            sort_order: "desc".to_string(),
            limit: 50,
            batch_only: false,
            single_only: false,
        };

        // Assert
        assert_eq!(cmd.status, Some("RUNNING".to_string()));
        assert_eq!(cmd.model, Some("TFT".to_string()));
    }

    /// TEST 12: Test status enum conversion
    #[test]
    fn test_status_enum_conversion() {
        // Test that TrainingStatus enum values are correct
        assert_eq!(TrainingStatus::Unknown as i32, 0);
        assert_eq!(TrainingStatus::Pending as i32, 1);
        assert_eq!(TrainingStatus::Running as i32, 2);
        assert_eq!(TrainingStatus::Completed as i32, 3);
        assert_eq!(TrainingStatus::Failed as i32, 4);
        assert_eq!(TrainingStatus::Stopped as i32, 5);
    }
}
