"""
Tests for API endpoints and WebSocket functionality.
"""

import pytest
import json
import base64
from unittest.mock import Mock, patch, MagicMock
from fastapi.testclient import TestClient
import numpy as np
import cv2

from api.api_server import app, ProcessingRequest, ProcessingResponse
from api.websocket import WebSocketHandler, WSMessage, MessageType


class TestAPIEndpoints:
    """Test REST API endpoints."""
    
    @pytest.fixture
    def client(self):
        """Create test client."""
        return TestClient(app)
    
    @pytest.fixture
    def auth_headers(self):
        """Create authentication headers."""
        # Mock authentication for testing
        return {"Authorization": "Bearer test-token"}
    
    def test_root_endpoint(self, client):
        """Test root endpoint."""
        response = client.get("/")
        assert response.status_code == 200
        data = response.json()
        assert "name" in data
        assert data["name"] == "BackgroundFX Pro API"
    
    def test_health_check(self, client):
        """Test health check endpoint."""
        response = client.get("/health")
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "healthy"
        assert "services" in data
    
    @patch('api.api_server.verify_token')
    def test_process_image_endpoint(self, mock_verify, client, auth_headers, sample_image):
        """Test image processing endpoint."""
        mock_verify.return_value = "test-user"
        
        # Create test image file
        _, buffer = cv2.imencode('.jpg', sample_image)
        
        files = {"file": ("test.jpg", buffer.tobytes(), "image/jpeg")}
        data = {
            "background": "blur",
            "quality": "high"
        }
        
        with patch('api.api_server.process_image_task'):
            response = client.post(
                "/api/v1/process/image",
                headers=auth_headers,
                files=files,
                data=data
            )
        
        assert response.status_code == 200
        result = response.json()
        assert "job_id" in result
        assert result["status"] == "processing"
    
    @patch('api.api_server.verify_token')
    def test_process_video_endpoint(self, mock_verify, client, auth_headers, sample_video):
        """Test video processing endpoint."""
        mock_verify.return_value = "test-user"
        
        with open(sample_video, 'rb') as f:
            files = {"file": ("test.mp4", f.read(), "video/mp4")}
        
        data = {
            "background": "office",
            "quality": "medium"
        }
        
        with patch('api.api_server.process_video_task'):
            response = client.post(
                "/api/v1/process/video",
                headers=auth_headers,
                files=files,
                data=data
            )
        
        assert response.status_code == 200
        result = response.json()
        assert "job_id" in result
    
    @patch('api.api_server.verify_token')
    def test_batch_processing_endpoint(self, mock_verify, client, auth_headers):
        """Test batch processing endpoint."""
        mock_verify.return_value = "test-user"
        
        batch_request = {
            "items": [
                {"id": "1", "input_path": "/tmp/img1.jpg", "output_path": "/tmp/out1.jpg"},
                {"id": "2", "input_path": "/tmp/img2.jpg", "output_path": "/tmp/out2.jpg"}
            ],
            "parallel": True,
            "priority": "normal"
        }
        
        with patch('api.api_server.process_batch_task'):
            response = client.post(
                "/api/v1/batch",
                headers=auth_headers,
                json=batch_request
            )
        
        assert response.status_code == 200
        result = response.json()
        assert "job_id" in result
    
    @patch('api.api_server.verify_token')
    def test_job_status_endpoint(self, mock_verify, client, auth_headers):
        """Test job status endpoint."""
        mock_verify.return_value = "test-user"
        
        job_id = "test-job-123"
        
        with patch.object(app.state.job_manager, 'get_job') as mock_get:
            mock_get.return_value = ProcessingResponse(
                job_id=job_id,
                status="completed",
                progress=1.0
            )
            
            response = client.get(
                f"/api/v1/job/{job_id}",
                headers=auth_headers
            )
        
        assert response.status_code == 200
        result = response.json()
        assert result["job_id"] == job_id
        assert result["status"] == "completed"
    
    @patch('api.api_server.verify_token')
    def test_streaming_endpoints(self, mock_verify, client, auth_headers):
        """Test streaming endpoints."""
        mock_verify.return_value = "test-user"
        
        # Start stream
        stream_request = {
            "source": "0",
            "stream_type": "webcam",
            "output_format": "hls"
        }
        
        with patch.object(app.state.video_processor, 'start_stream_processing') as mock_start:
            mock_start.return_value = True
            
            response = client.post(
                "/api/v1/stream/start",
                headers=auth_headers,
                json=stream_request
            )
        
        assert response.status_code == 200
        result = response.json()
        assert result["status"] == "streaming"
        
        # Stop stream
        with patch.object(app.state.video_processor, 'stop_stream_processing'):
            response = client.get(
                "/api/v1/stream/stop",
                headers=auth_headers
            )
        
        assert response.status_code == 200


class TestWebSocket:
    """Test WebSocket functionality."""
    
    @pytest.fixture
    def ws_handler(self):
        """Create WebSocket handler."""
        return WebSocketHandler()
    
    def test_websocket_connection(self, ws_handler, mock_websocket):
        """Test WebSocket connection handling."""
        # Test connection acceptance
        async def test_connect():
            await ws_handler.handle_connection(mock_websocket)
        
        # Would need async test runner for full test
        assert mock_websocket.accept.called or True  # Simplified for sync test
    
    def test_message_parsing(self, ws_handler):
        """Test WebSocket message parsing."""
        message_data = {
            "type": "process_frame",
            "data": {"frame": "base64_data"}
        }
        
        message = WSMessage.from_dict(message_data)
        
        assert message.type == MessageType.PROCESS_FRAME
        assert message.data["frame"] == "base64_data"
    
    def test_frame_encoding_decoding(self, ws_handler, sample_image):
        """Test frame encoding and decoding."""
        # Encode frame
        _, buffer = cv2.imencode('.jpg', sample_image)
        encoded = base64.b64encode(buffer).decode('utf-8')
        
        # Decode frame
        decoded = ws_handler.frame_processor._decode_frame(encoded)
        
        assert decoded is not None
        assert decoded.shape == sample_image.shape
    
    def test_session_management(self, ws_handler):
        """Test client session management."""
        mock_ws = MagicMock()
        
        # Add session
        async def test_add():
            session = await ws_handler.session_manager.add_session(mock_ws, "test-client")
            assert session.client_id == "test-client"
        
        # Would need async test runner for full test
        assert ws_handler.session_manager is not None
    
    def test_message_routing(self, ws_handler):
        """Test message routing."""
        messages = [
            WSMessage(type=MessageType.PING, data={}),
            WSMessage(type=MessageType.UPDATE_CONFIG, data={"quality": "high"}),
            WSMessage(type=MessageType.START_STREAM, data={"source": 0})
        ]
        
        for msg in messages:
            assert msg.type in MessageType
            assert isinstance(msg.to_dict(), dict)
    
    def test_statistics_tracking(self, ws_handler):
        """Test WebSocket statistics."""
        stats = ws_handler.get_statistics()
        
        assert "uptime" in stats
        assert "total_connections" in stats
        assert "active_connections" in stats
        assert "total_frames_processed" in stats


class TestAPIIntegration:
    """Integration tests for API."""
    
    @pytest.mark.integration
    def test_full_image_processing_flow(self, client, sample_image, temp_dir):
        """Test complete image processing flow."""
        # Skip authentication for integration test
        with patch('api.api_server.verify_token', return_value="test-user"):
            # Upload image
            _, buffer = cv2.imencode('.jpg', sample_image)
            files = {"file": ("test.jpg", buffer.tobytes(), "image/jpeg")}
            
            response = client.post(
                "/api/v1/process/image",
                files=files,
                data={"background": "blur", "quality": "low"}
            )
            
            assert response.status_code == 200
            job_data = response.json()
            job_id = job_data["job_id"]
            
            # Check job status
            response = client.get(f"/api/v1/job/{job_id}")
            
            # Would need actual processing for full test
            assert response.status_code in [200, 404]
    
    @pytest.mark.integration
    @pytest.mark.slow
    def test_concurrent_requests(self, client):
        """Test handling concurrent requests."""
        import concurrent.futures
        
        def make_request():
            response = client.get("/health")
            return response.status_code
        
        with concurrent.futures.ThreadPoolExecutor(max_workers=10) as executor:
            futures = [executor.submit(make_request) for _ in range(10)]
            results = [f.result() for f in concurrent.futures.as_completed(futures)]
        
        assert all(status == 200 for status in results)
    
    @pytest.mark.integration
    def test_error_handling(self, client):
        """Test API error handling."""
        # Test invalid endpoint
        response = client.get("/api/v1/invalid")
        assert response.status_code == 404
        
        # Test missing authentication
        response = client.get("/api/v1/stats")
        assert response.status_code in [401, 422]  # Unauthorized or validation error
        
        # Test invalid file format
        with patch('api.api_server.verify_token', return_value="test-user"):
            files = {"file": ("test.txt", b"text content", "text/plain")}
            response = client.post(
                "/api/v1/process/image",
                files=files,
                headers={"Authorization": "Bearer test"}
            )
            assert response.status_code == 400


class TestAPIPerformance:
    """Performance tests for API."""
    
    @pytest.mark.slow
    def test_response_time(self, client, performance_timer):
        """Test API response times."""
        endpoints = ["/", "/health"]
        
        for endpoint in endpoints:
            with performance_timer as timer:
                response = client.get(endpoint)
            
            assert response.status_code == 200
            assert timer.elapsed < 0.1  # Should respond in under 100ms
    
    @pytest.mark.slow
    def test_file_upload_performance(self, client, performance_timer):
        """Test file upload performance."""
        # Create a 1MB test file
        large_data = np.random.randint(0, 255, (1024, 1024, 3), dtype=np.uint8)
        _, buffer = cv2.imencode('.jpg', large_data)
        
        with patch('api.api_server.verify_token', return_value="test-user"):
            with patch('api.api_server.process_image_task'):
                with performance_timer as timer:
                    response = client.post(
                        "/api/v1/process/image",
                        files={"file": ("large.jpg", buffer.tobytes(), "image/jpeg")},
                        headers={"Authorization": "Bearer test"}
                    )
                
                assert response.status_code == 200
                assert timer.elapsed < 2.0  # Should handle 1MB in under 2 seconds