"""Tests for autopilot model training functionality."""

import pytest
from unittest.mock import Mock, patch, AsyncMock, MagicMock
from fastapi.testclient import TestClient

from backend.main import app


@pytest.fixture
def client():
    """Test client fixture."""
    return TestClient(app)


@pytest.fixture
def mock_train_task():
    """Mock Celery train_model_task."""
    with patch('backend.api.autopilot.train_model_task') as mock:
        mock_result = Mock()
        mock_result.id = "test-task-id-12345"
        mock.delay.return_value = mock_result
        yield mock


@pytest.fixture
def mock_async_result():
    """Mock Celery AsyncResult."""
    with patch('backend.api.autopilot.AsyncResult') as mock:
        yield mock


@pytest.fixture
def mock_strategy_selector():
    """Mock StrategySelector."""
    selector = Mock()
    selector.model = Mock()
    selector.model.is_trained = True
    selector.model.model_type = "classifier"
    selector.model.feature_names = ["rsi", "macd", "sma_20"]
    selector.model.training_metadata = {
        "trained_at": "2024-01-01T00:00:00",
        "metrics": {"test_accuracy": 0.85}
    }
    selector.get_model_info.return_value = {
        "is_trained": True,
        "model_type": "classifier",
        "available_strategies": ["rsi", "macd", "momentum"],
        "feature_count": 54,
        "training_metadata": {
            "trained_at": "2024-01-01T00:00:00",
            "metrics": {"test_accuracy": 0.85},
            "training_symbols": ["BTC/USD", "ETH/USD"]
        }
    }
    return selector


class TestBootstrapConfig:
    """Tests for bootstrap configuration endpoints."""

    def test_get_bootstrap_config(self, client):
        """Test getting bootstrap configuration."""
        response = client.get("/api/autopilot/bootstrap-config")
        assert response.status_code == 200
        data = response.json()
        
        # Verify required fields exist
        assert "days" in data
        assert "timeframe" in data
        assert "min_samples_per_strategy" in data
        assert "symbols" in data
        
        # Verify types
        assert isinstance(data["days"], int)
        assert isinstance(data["timeframe"], str)
        assert isinstance(data["min_samples_per_strategy"], int)
        assert isinstance(data["symbols"], list)

    def test_update_bootstrap_config(self, client):
        """Test updating bootstrap configuration."""
        new_config = {
            "days": 365,
            "timeframe": "4h",
            "min_samples_per_strategy": 50,
            "symbols": ["BTC/USD", "ETH/USD", "SOL/USD"]
        }
        
        response = client.put(
            "/api/autopilot/bootstrap-config",
            json=new_config
        )
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "success"
        
        # Verify the config was updated
        response = client.get("/api/autopilot/bootstrap-config")
        data = response.json()
        assert data["days"] == 365
        assert data["timeframe"] == "4h"
        assert data["min_samples_per_strategy"] == 50
        assert "SOL/USD" in data["symbols"]


class TestModelTraining:
    """Tests for model training endpoints."""

    def test_trigger_retrain(self, client, mock_train_task):
        """Test triggering model retraining."""
        response = client.post("/api/autopilot/intelligent/retrain?force=true")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "queued"
        assert "task_id" in data
        assert data["task_id"] == "test-task-id-12345"
        
        # Verify task was called with correct parameters
        mock_train_task.delay.assert_called_once()
        call_kwargs = mock_train_task.delay.call_args.kwargs
        assert call_kwargs["force_retrain"] is True
        assert call_kwargs["bootstrap"] is True
        assert "symbols" in call_kwargs
        assert "days" in call_kwargs
        assert "timeframe" in call_kwargs
        assert "min_samples_per_strategy" in call_kwargs

    def test_get_task_status_pending(self, client, mock_async_result):
        """Test getting status of a pending task."""
        mock_result = Mock()
        mock_result.status = "PENDING"
        mock_result.result = None
        mock_async_result.return_value = mock_result
        
        response = client.get("/api/autopilot/tasks/test-task-id")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "PENDING"

    def test_get_task_status_progress(self, client, mock_async_result):
        """Test getting status of a task in progress."""
        mock_result = Mock()
        mock_result.status = "PROGRESS"
        mock_result.result = None
        mock_result.info = {
            "step": "fetching",
            "progress": 50,
            "message": "Fetching BTC/USD data..."
        }
        mock_async_result.return_value = mock_result
        
        response = client.get("/api/autopilot/tasks/test-task-id")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "PROGRESS"
        assert data["meta"]["progress"] == 50

    def test_get_task_status_success(self, client, mock_async_result):
        """Test getting status of a successful task."""
        mock_result = Mock()
        mock_result.status = "SUCCESS"
        mock_result.result = {
            "train_accuracy": 0.85,
            "test_accuracy": 0.78,
            "n_samples": 1000,
            "best_model": "xgboost"
        }
        mock_async_result.return_value = mock_result
        
        response = client.get("/api/autopilot/tasks/test-task-id")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "SUCCESS"
        assert data["result"]["best_model"] == "xgboost"

    def test_get_task_status_failure(self, client, mock_async_result):
        """Test getting status of a failed task."""
        mock_result = Mock()
        mock_result.status = "FAILURE"
        mock_result.result = Exception("Training failed: insufficient data")
        mock_result.traceback = "Traceback (most recent call last)..."
        mock_async_result.return_value = mock_result
        
        response = client.get("/api/autopilot/tasks/test-task-id")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "FAILURE"
        assert "error" in data["result"]


class TestModelInfo:
    """Tests for model info endpoint."""

    @patch('backend.api.autopilot.get_strategy_selector')
    def test_get_model_info_trained(self, mock_get_selector, client, mock_strategy_selector):
        """Test getting info for a trained model."""
        mock_get_selector.return_value = mock_strategy_selector
        
        response = client.get("/api/autopilot/intelligent/model-info")
        
        assert response.status_code == 200
        data = response.json()
        assert data["is_trained"] is True
        assert "available_strategies" in data
        assert "feature_count" in data

    @patch('backend.api.autopilot.get_strategy_selector')
    def test_get_model_info_untrained(self, mock_get_selector, client):
        """Test getting info for an untrained model."""
        mock_selector = Mock()
        mock_selector.get_model_info.return_value = {
            "is_trained": False,
            "model_type": "classifier",
            "available_strategies": ["rsi", "macd"],
            "feature_count": 0
        }
        mock_get_selector.return_value = mock_selector
        
        response = client.get("/api/autopilot/intelligent/model-info")
        
        assert response.status_code == 200
        data = response.json()
        assert data["is_trained"] is False
        assert data["feature_count"] == 0


class TestModelReset:
    """Tests for model reset endpoint."""

    @patch('backend.api.autopilot.get_strategy_selector')
    def test_reset_model(self, mock_get_selector, client):
        """Test resetting the model."""
        mock_selector = Mock()
        mock_selector.reset_model = AsyncMock(return_value={"status": "success"})
        mock_get_selector.return_value = mock_selector
        
        response = client.post("/api/autopilot/intelligent/reset")
        
        assert response.status_code == 200


@pytest.mark.integration
class TestTrainingWorkflow:
    """Integration tests for the complete training workflow."""

    @patch('backend.api.autopilot.train_model_task')
    def test_config_and_retrain_workflow(self, mock_train_task, client):
        """Test configure -> train workflow passes config correctly."""
        # Setup mock
        mock_task_result = Mock()
        mock_task_result.id = "test-task-123"
        mock_train_task.delay.return_value = mock_task_result
        
        # 1. Configure bootstrap settings with specific values
        config = {
            "days": 180,
            "timeframe": "4h",
            "min_samples_per_strategy": 25,
            "symbols": ["BTC/USD", "ETH/USD", "SOL/USD", "XRP/USD"]
        }
        response = client.put("/api/autopilot/bootstrap-config", json=config)
        assert response.status_code == 200
        
        # 2. Trigger retraining
        response = client.post("/api/autopilot/intelligent/retrain?force=true")
        assert response.status_code == 200
        
        # 3. Verify the task was called with the correct config
        mock_train_task.delay.assert_called_once()
        call_kwargs = mock_train_task.delay.call_args.kwargs
        
        # All config should be passed to the task
        assert call_kwargs["days"] == 180
        assert call_kwargs["timeframe"] == "4h"
        assert call_kwargs["min_samples_per_strategy"] == 25
        assert call_kwargs["symbols"] == ["BTC/USD", "ETH/USD", "SOL/USD", "XRP/USD"]
        assert call_kwargs["force_retrain"] is True
        assert call_kwargs["bootstrap"] is True