//! Model Factory for Testing
//!
//! This module provides factory functions for creating model instances
//! primarily for testing purposes.

use crate::{Features, MLModel, MLResult, ModelMetadata, ModelPrediction, ModelType};
use std::sync::Arc;

/// Simple `DQN` wrapper for testing
#[derive(Debug)]
pub struct DQNWrapper {
    model_id: String,
}

impl DQNWrapper {
    /// Create a new `DQN` wrapper
    pub fn new(model_id: String) -> Self {
        Self { model_id }
    }
}

#[async_trait::async_trait]
impl MLModel for DQNWrapper {
    fn name(&self) -> &str {
        &self.model_id
    }

    fn model_type(&self) -> ModelType {
        ModelType::DQN
    }

    async fn predict(&self, _features: &Features) -> MLResult<ModelPrediction> {
        // Simple stub implementation for testing
        Ok(ModelPrediction::new(
            self.model_id.clone(),
            0.5, // prediction value
            0.8, // confidence
        ))
    }

    fn get_confidence(&self) -> f64 {
        0.8
    }

    fn get_metadata(&self) -> ModelMetadata {
        ModelMetadata::new(
            ModelType::DQN,
            "1.0.0".to_string(),
            10,    // features_used
            128.0, // memory_usage_mb
        )
    }
}

/// Create a `DQN` wrapper for testing
pub fn create_dqn_wrapper() -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(DQNWrapper::new("test_dqn".to_string())))
}

/// Create a `DQN` wrapper with specific model ID
pub fn create_dqn_wrapper_with_id(model_id: String) -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(DQNWrapper::new(model_id)))
}

/// Simple PPO wrapper for testing
#[derive(Debug)]
pub struct PPOWrapper {
    model_id: String,
}

impl PPOWrapper {
    /// Create a new PPO wrapper
    pub fn new(model_id: String) -> Self {
        Self { model_id }
    }
}

#[async_trait::async_trait]
impl MLModel for PPOWrapper {
    fn name(&self) -> &str {
        &self.model_id
    }

    fn model_type(&self) -> ModelType {
        ModelType::PPO
    }

    async fn predict(&self, _features: &Features) -> MLResult<ModelPrediction> {
        // Simple stub implementation for testing
        Ok(ModelPrediction::new(
            self.model_id.clone(),
            0.6,  // prediction value
            0.85, // confidence
        ))
    }

    fn get_confidence(&self) -> f64 {
        0.85
    }

    fn get_metadata(&self) -> ModelMetadata {
        ModelMetadata::new(
            ModelType::PPO,
            "1.0.0".to_string(),
            15,    // features_used
            145.0, // memory_usage_mb
        )
    }
}

/// Create a PPO wrapper for testing
pub fn create_ppo_wrapper() -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(PPOWrapper::new("test_ppo".to_string())))
}

/// Create a PPO wrapper with specific model ID
pub fn create_ppo_wrapper_with_id(model_id: String) -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(PPOWrapper::new(model_id)))
}

/// Simple TFT wrapper for testing
#[derive(Debug)]
pub struct TFTWrapper {
    model_id: String,
}

impl TFTWrapper {
    /// Create a new TFT wrapper
    pub fn new(model_id: String) -> Self {
        Self { model_id }
    }
}

#[async_trait::async_trait]
impl MLModel for TFTWrapper {
    fn name(&self) -> &str {
        &self.model_id
    }

    fn model_type(&self) -> ModelType {
        ModelType::TFT
    }

    async fn predict(&self, _features: &Features) -> MLResult<ModelPrediction> {
        // Simple stub implementation for testing
        Ok(ModelPrediction::new(
            self.model_id.clone(),
            0.55, // prediction value
            0.82, // confidence
        ))
    }

    fn get_confidence(&self) -> f64 {
        0.82
    }

    fn get_metadata(&self) -> ModelMetadata {
        ModelMetadata::new(
            ModelType::TFT,
            "1.0.0".to_string(),
            20,    // features_used
            125.0, // memory_usage_mb
        )
    }
}

/// Create a TFT wrapper for testing
pub fn create_tft_wrapper() -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(TFTWrapper::new("test_tft".to_string())))
}

/// Create a TFT wrapper with specific model ID
pub fn create_tft_wrapper_with_id(model_id: String) -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(TFTWrapper::new(model_id)))
}

/// Simple MAMBA wrapper for testing
#[derive(Debug)]
pub struct MambaWrapper {
    model_id: String,
}

impl MambaWrapper {
    /// Create a new MAMBA wrapper
    pub fn new(model_id: String) -> Self {
        Self { model_id }
    }
}

#[async_trait::async_trait]
impl MLModel for MambaWrapper {
    fn name(&self) -> &str {
        &self.model_id
    }

    fn model_type(&self) -> ModelType {
        ModelType::MAMBA
    }

    async fn predict(&self, _features: &Features) -> MLResult<ModelPrediction> {
        // Simple stub implementation for testing
        Ok(ModelPrediction::new(
            self.model_id.clone(),
            0.58, // prediction value
            0.87, // confidence
        ))
    }

    fn get_confidence(&self) -> f64 {
        0.87
    }

    fn get_metadata(&self) -> ModelMetadata {
        ModelMetadata::new(
            ModelType::MAMBA,
            "1.0.0".to_string(),
            25,    // features_used
            164.0, // memory_usage_mb
        )
    }
}

/// Create a MAMBA wrapper for testing
pub fn create_mamba_wrapper() -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(MambaWrapper::new("test_mamba".to_string())))
}

/// Create a MAMBA wrapper with specific model ID
pub fn create_mamba_wrapper_with_id(model_id: String) -> MLResult<Arc<dyn MLModel>> {
    Ok(Arc::new(MambaWrapper::new(model_id)))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_create_dqn_wrapper() {
        let model = create_dqn_wrapper().unwrap();
        assert_eq!(model.name(), "test_dqn");
        assert_eq!(model.model_type(), ModelType::DQN);
        assert!(model.is_ready());
    }

    #[tokio::test]
    async fn test_dqn_wrapper_prediction() {
        let model = create_dqn_wrapper().unwrap();
        let features = Features::new(
            vec![1.0, 2.0, 3.0],
            vec!["f1".to_string(), "f2".to_string(), "f3".to_string()],
        );

        let prediction = model.predict(&features).await.unwrap();
        assert_eq!(prediction.value, 0.5);
        assert_eq!(prediction.confidence, 0.8);
    }

    #[tokio::test]
    async fn test_create_ppo_wrapper() {
        let model = create_ppo_wrapper().unwrap();
        assert_eq!(model.name(), "test_ppo");
        assert_eq!(model.model_type(), ModelType::PPO);
        assert!(model.is_ready());
    }

    #[tokio::test]
    async fn test_ppo_wrapper_prediction() {
        let model = create_ppo_wrapper().unwrap();
        let features = Features::new(
            vec![1.0, 2.0, 3.0],
            vec!["f1".to_string(), "f2".to_string(), "f3".to_string()],
        );

        let prediction = model.predict(&features).await.unwrap();
        assert_eq!(prediction.value, 0.6);
        assert_eq!(prediction.confidence, 0.85);
    }

    #[tokio::test]
    async fn test_create_tft_wrapper() {
        let model = create_tft_wrapper().unwrap();
        assert_eq!(model.name(), "test_tft");
        assert_eq!(model.model_type(), ModelType::TFT);
        assert!(model.is_ready());
    }

    #[tokio::test]
    async fn test_tft_wrapper_prediction() {
        let model = create_tft_wrapper().unwrap();
        let features = Features::new(
            vec![1.0, 2.0, 3.0],
            vec!["f1".to_string(), "f2".to_string(), "f3".to_string()],
        );

        let prediction = model.predict(&features).await.unwrap();
        assert_eq!(prediction.value, 0.55);
        assert_eq!(prediction.confidence, 0.82);
    }

    #[tokio::test]
    async fn test_create_mamba_wrapper() {
        let model = create_mamba_wrapper().unwrap();
        assert_eq!(model.name(), "test_mamba");
        assert_eq!(model.model_type(), ModelType::MAMBA);
        assert!(model.is_ready());
    }

    #[tokio::test]
    async fn test_mamba_wrapper_prediction() {
        let model = create_mamba_wrapper().unwrap();
        let features = Features::new(
            vec![1.0, 2.0, 3.0],
            vec!["f1".to_string(), "f2".to_string(), "f3".to_string()],
        );

        let prediction = model.predict(&features).await.unwrap();
        assert_eq!(prediction.value, 0.58);
        assert_eq!(prediction.confidence, 0.87);
    }

    #[tokio::test]
    async fn test_all_wrappers_with_custom_ids() {
        let dqn = create_dqn_wrapper_with_id("custom_dqn".to_string()).unwrap();
        let ppo = create_ppo_wrapper_with_id("custom_ppo".to_string()).unwrap();
        let tft = create_tft_wrapper_with_id("custom_tft".to_string()).unwrap();
        let mamba = create_mamba_wrapper_with_id("custom_mamba".to_string()).unwrap();

        assert_eq!(dqn.name(), "custom_dqn");
        assert_eq!(ppo.name(), "custom_ppo");
        assert_eq!(tft.name(), "custom_tft");
        assert_eq!(mamba.name(), "custom_mamba");

        // All models should be ready
        assert!(dqn.is_ready());
        assert!(ppo.is_ready());
        assert!(tft.is_ready());
        assert!(mamba.is_ready());
    }
}