"""
Tests for the main application and video processor.
"""

import pytest
from unittest.mock import Mock, patch, MagicMock
import numpy as np
import cv2
from pathlib import Path
import tempfile

# Import from main app
from app import VideoProcessor, processor


class TestVideoProcessor:
    """Test the main VideoProcessor class."""
    
    @pytest.fixture
    def video_processor(self):
        """Create a test video processor."""
        with patch('app.model_loader.ModelLoader') as mock_loader:
            with patch('app.device_manager.DeviceManager') as mock_device:
                mock_device.return_value.get_optimal_device.return_value = 'cpu'
                vp = VideoProcessor()
                return vp
    
    def test_initialization(self, video_processor):
        """Test VideoProcessor initialization."""
        assert video_processor is not None
        assert video_processor.models_loaded == False
        assert video_processor.cancel_event is not None
    
    @patch('app.model_loader.ModelLoader.load_all_models')
    def test_load_models(self, mock_load, video_processor):
        """Test model loading."""
        mock_sam2 = Mock()
        mock_matanyone = Mock()
        mock_load.return_value = (mock_sam2, mock_matanyone)
        
        result = video_processor.load_models()
        
        assert mock_load.called
        assert video_processor.models_loaded == True
        assert "Models already loaded" in result or "loaded" in result.lower()
    
    def test_load_models_with_progress(self, video_processor):
        """Test model loading with progress callback."""
        progress_values = []
        
        def progress_callback(value, message):
            progress_values.append((value, message))
        
        with patch.object(video_processor.model_loader, 'load_all_models') as mock_load:
            mock_load.return_value = (Mock(), Mock())
            video_processor.load_models(progress_callback)
        
        assert video_processor.models_loaded == True
    
    def test_process_video_without_models(self, video_processor):
        """Test video processing without loaded models."""
        result_path, message = video_processor.process_video(
            "test.mp4", "blur"
        )
        
        assert result_path is None
        assert "not loaded" in message.lower()
    
    @patch('app.validate_video_file')
    @patch.object(VideoProcessor, '_process_single_stage')
    def test_process_video_single_stage(self, mock_process, mock_validate, video_processor):
        """Test single-stage video processing."""
        mock_validate.return_value = (True, "Valid")
        mock_process.return_value = ("/tmp/output.mp4", "Success")
        
        video_processor.models_loaded = True
        video_processor.core_processor = Mock()
        
        result_path, message = video_processor.process_video(
            "test.mp4", "blur", use_two_stage=False
        )
        
        assert mock_process.called
        assert result_path == "/tmp/output.mp4"
        assert "Success" in message
    
    @patch('app.TWO_STAGE_AVAILABLE', True)
    @patch('app.validate_video_file')
    @patch.object(VideoProcessor, '_process_two_stage')
    def test_process_video_two_stage(self, mock_process, mock_validate, video_processor):
        """Test two-stage video processing."""
        mock_validate.return_value = (True, "Valid")
        mock_process.return_value = ("/tmp/output.mp4", "Success")
        
        video_processor.models_loaded = True
        video_processor.core_processor = Mock()
        video_processor.two_stage_processor = Mock()
        
        result_path, message = video_processor.process_video(
            "test.mp4", "blur", use_two_stage=True
        )
        
        assert mock_process.called
        assert result_path == "/tmp/output.mp4"
    
    def test_cancel_processing(self, video_processor):
        """Test processing cancellation."""
        video_processor.cancel_processing()
        assert video_processor.cancel_event.is_set()
    
    def test_get_status(self, video_processor):
        """Test getting processor status."""
        status = video_processor.get_status()
        
        assert "models_loaded" in status
        assert "device" in status
        assert "memory_usage" in status
        assert status["models_loaded"] == False
    
    def test_cleanup_resources(self, video_processor):
        """Test resource cleanup."""
        with patch.object(video_processor.memory_manager, 'cleanup_aggressive'):
            with patch.object(video_processor.model_loader, 'cleanup'):
                video_processor.cleanup_resources()
        
        assert True  # Cleanup should not raise exceptions


class TestCoreVideoProcessor:
    """Test the CoreVideoProcessor from video_processor module."""
    
    @pytest.fixture
    def core_processor(self, mock_sam2_predictor, mock_matanyone_model):
        """Create a test core processor."""
        from video_processor import CoreVideoProcessor
        from app_config import ProcessingConfig
        from memory_manager import MemoryManager
        
        config = ProcessingConfig()
        memory_mgr = MemoryManager('cpu')
        
        processor = CoreVideoProcessor(
            sam2_predictor=mock_sam2_predictor,
            matanyone_model=mock_matanyone_model,
            config=config,
            memory_mgr=memory_mgr
        )
        return processor
    
    def test_core_processor_initialization(self, core_processor):
        """Test CoreVideoProcessor initialization."""
        assert core_processor is not None
        assert core_processor.processing_active == False
        assert core_processor.stats is not None
    
    def test_prepare_background(self, core_processor):
        """Test background preparation."""
        # Test professional background
        background = core_processor.prepare_background(
            "blur", None, 512, 512
        )
        # May return None if utilities not available
        assert background is None or background.shape == (512, 512, 3)
    
    def test_get_processing_capabilities(self, core_processor):
        """Test getting processing capabilities."""
        capabilities = core_processor.get_processing_capabilities()
        
        assert "sam2_available" in capabilities
        assert "matanyone_available" in capabilities
        assert "quality_preset" in capabilities
        assert "supported_formats" in capabilities
    
    def test_get_status(self, core_processor):
        """Test getting processor status."""
        status = core_processor.get_status()
        
        assert "processing_active" in status
        assert "models_available" in status
        assert "statistics" in status
        assert "memory_usage" in status


class TestApplicationIntegration:
    """Integration tests for the main application."""
    
    @pytest.mark.integration
    def test_global_processor_instance(self):
        """Test the global processor instance."""
        assert processor is not None
        assert isinstance(processor, VideoProcessor)
    
    @pytest.mark.integration
    @patch('app.model_loader.ModelLoader.load_all_models')
    def test_model_loading_flow(self, mock_load):
        """Test complete model loading flow."""
        mock_load.return_value = (Mock(), Mock())
        
        # Use global processor
        result = processor.load_models()
        
        assert processor.models_loaded == True
        assert result is not None
    
    @pytest.mark.integration
    @pytest.mark.slow
    def test_memory_management(self):
        """Test memory management during processing."""
        import psutil
        import os
        
        process = psutil.Process(os.getpid())
        initial_memory = process.memory_info().rss / 1024 / 1024  # MB
        
        # Simulate processing
        for _ in range(5):
            # Create and discard large arrays
            data = np.random.randint(0, 255, (1024, 1024, 3), dtype=np.uint8)
            del data
        
        processor.cleanup_resources()
        
        final_memory = process.memory_info().rss / 1024 / 1024  # MB
        memory_increase = final_memory - initial_memory
        
        # Memory increase should be reasonable
        assert memory_increase < 200  # Less than 200MB increase


class TestBackwardCompatibility:
    """Test backward compatibility functions."""
    
    def test_load_models_wrapper(self):
        """Test load_models_with_validation wrapper."""
        from app import load_models_with_validation
        
        with patch.object(processor, 'load_models') as mock_load:
            mock_load.return_value = "Success"
            result = load_models_with_validation()
        
        assert mock_load.called
        assert result == "Success"
    
    def test_process_video_wrapper(self):
        """Test process_video_fixed wrapper."""
        from app import process_video_fixed
        
        with patch.object(processor, 'process_video') as mock_process:
            mock_process.return_value = ("/tmp/out.mp4", "Success")
            
            result = process_video_fixed(
                "test.mp4", "blur", None
            )
        
        assert mock_process.called
        assert result[0] == "/tmp/out.mp4"
    
    def test_get_model_status_wrapper(self):
        """Test get_model_status wrapper."""
        from app import get_model_status
        
        with patch.object(processor, 'get_status') as mock_status:
            mock_status.return_value = {"status": "ok"}
            result = get_model_status()
        
        assert mock_status.called
        assert result["status"] == "ok"


class TestErrorHandling:
    """Test error handling in the application."""
    
    def test_invalid_video_handling(self):
        """Test handling of invalid video files."""
        with patch('app.validate_video_file') as mock_validate:
            mock_validate.return_value = (False, "Invalid format")
            
            processor.models_loaded = True
            result_path, message = processor.process_video(
                "invalid.txt", "blur"
            )
        
        assert result_path is None
        assert "Invalid" in message
    
    def test_model_loading_failure(self):
        """Test handling of model loading failures."""
        with patch.object(processor.model_loader, 'load_all_models') as mock_load:
            mock_load.side_effect = Exception("Model not found")
            
            result = processor.load_models()
        
        assert processor.models_loaded == False
        assert "failed" in result.lower()
    
    def test_processing_exception_handling(self):
        """Test exception handling during processing."""
        processor.models_loaded = True
        processor.core_processor = Mock()
        processor.core_processor.process_video.side_effect = Exception("Processing failed")
        
        with patch('app.validate_video_file', return_value=(True, "Valid")):
            result_path, message = processor.process_video(
                "test.mp4", "blur"
            )
        
        assert result_path is None
        assert "error" in message.lower() or "failed" in message.lower()


class TestPerformance:
    """Performance tests for the application."""
    
    @pytest.mark.slow
    def test_initialization_speed(self, performance_timer):
        """Test application initialization speed."""
        with performance_timer as timer:
            vp = VideoProcessor()
        
        assert timer.elapsed < 1.0  # Should initialize in under 1 second
    
    @pytest.mark.slow
    @patch('app.model_loader.ModelLoader.load_all_models')
    def test_model_loading_speed(self, mock_load, performance_timer):
        """Test model loading speed."""
        mock_load.return_value = (Mock(), Mock())
        
        with performance_timer as timer:
            processor.load_models()
        
        # Mock loading should be very fast
        assert timer.elapsed < 0.5