"""
Integration tests for WiFi-DensePose API endpoints.

Tests all REST API endpoints with real service dependencies.
"""

import pytest
import asyncio
from datetime import datetime, timedelta
from typing import Dict, Any
from unittest.mock import AsyncMock, MagicMock

from fastapi.testclient import TestClient
from fastapi import FastAPI
import httpx

from src.api.dependencies import (
    get_pose_service,
    get_stream_service,
    get_hardware_service,
    get_current_user
)
from src.api.routers.health import router as health_router
from src.api.routers.pose import router as pose_router
from src.api.routers.stream import router as stream_router


class TestAPIEndpoints:
    """Integration tests for API endpoints."""
    
    @pytest.fixture
    def app(self):
        """Create FastAPI app with test dependencies."""
        app = FastAPI()
        app.include_router(health_router, prefix="/health", tags=["health"])
        app.include_router(pose_router, prefix="/pose", tags=["pose"])
        app.include_router(stream_router, prefix="/stream", tags=["stream"])
        return app
    
    @pytest.fixture
    def mock_pose_service(self):
        """Mock pose service."""
        service = AsyncMock()
        service.health_check.return_value = {
            "status": "healthy",
            "message": "Service operational",
            "uptime_seconds": 3600.0,
            "metrics": {"processed_frames": 1000}
        }
        service.is_ready.return_value = True
        service.estimate_poses.return_value = {
            "timestamp": datetime.utcnow(),
            "frame_id": "test-frame-001",
            "persons": [],
            "zone_summary": {"zone1": 0},
            "processing_time_ms": 50.0,
            "metadata": {}
        }
        return service
    
    @pytest.fixture
    def mock_stream_service(self):
        """Mock stream service."""
        service = AsyncMock()
        service.health_check.return_value = {
            "status": "healthy",
            "message": "Stream service operational",
            "uptime_seconds": 1800.0
        }
        service.is_ready.return_value = True
        service.get_status.return_value = {
            "is_active": True,
            "active_streams": [],
            "uptime_seconds": 1800.0
        }
        service.is_active.return_value = True
        return service
    
    @pytest.fixture
    def mock_hardware_service(self):
        """Mock hardware service."""
        service = AsyncMock()
        service.health_check.return_value = {
            "status": "healthy",
            "message": "Hardware connected",
            "uptime_seconds": 7200.0,
            "metrics": {"connected_routers": 3}
        }
        service.is_ready.return_value = True
        return service
    
    @pytest.fixture
    def mock_user(self):
        """Mock authenticated user."""
        return {
            "id": "test-user-001",
            "username": "testuser",
            "email": "test@example.com",
            "is_admin": False,
            "is_active": True,
            "permissions": ["read", "write"]
        }
    
    @pytest.fixture
    def client(self, app, mock_pose_service, mock_stream_service, mock_hardware_service, mock_user):
        """Create test client with mocked dependencies."""
        app.dependency_overrides[get_pose_service] = lambda: mock_pose_service
        app.dependency_overrides[get_stream_service] = lambda: mock_stream_service
        app.dependency_overrides[get_hardware_service] = lambda: mock_hardware_service
        app.dependency_overrides[get_current_user] = lambda: mock_user
        
        with TestClient(app) as client:
            yield client
    
    def test_health_check_endpoint_should_fail_initially(self, client):
        """Test health check endpoint - should fail initially."""
        # This test should fail because we haven't implemented the endpoint properly
        response = client.get("/health/health")
        
        # This assertion will fail initially, driving us to implement the endpoint
        assert response.status_code == 200
        assert "status" in response.json()
        assert "components" in response.json()
        assert "system_metrics" in response.json()
    
    def test_readiness_check_endpoint_should_fail_initially(self, client):
        """Test readiness check endpoint - should fail initially."""
        response = client.get("/health/ready")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "ready" in data
        assert "checks" in data
        assert isinstance(data["checks"], dict)
    
    def test_liveness_check_endpoint_should_fail_initially(self, client):
        """Test liveness check endpoint - should fail initially."""
        response = client.get("/health/live")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "status" in data
        assert data["status"] == "alive"
    
    def test_version_info_endpoint_should_fail_initially(self, client):
        """Test version info endpoint - should fail initially."""
        response = client.get("/health/version")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "name" in data
        assert "version" in data
        assert "environment" in data
    
    def test_pose_current_endpoint_should_fail_initially(self, client):
        """Test current pose estimation endpoint - should fail initially."""
        response = client.get("/pose/current")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "timestamp" in data
        assert "frame_id" in data
        assert "persons" in data
        assert "zone_summary" in data
    
    def test_pose_analyze_endpoint_should_fail_initially(self, client):
        """Test pose analysis endpoint - should fail initially."""
        request_data = {
            "zone_ids": ["zone1", "zone2"],
            "confidence_threshold": 0.7,
            "max_persons": 10,
            "include_keypoints": True,
            "include_segmentation": False
        }
        
        response = client.post("/pose/analyze", json=request_data)
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "timestamp" in data
        assert "persons" in data
    
    def test_zone_occupancy_endpoint_should_fail_initially(self, client):
        """Test zone occupancy endpoint - should fail initially."""
        response = client.get("/pose/zones/zone1/occupancy")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "zone_id" in data
        assert "current_occupancy" in data
    
    def test_zones_summary_endpoint_should_fail_initially(self, client):
        """Test zones summary endpoint - should fail initially."""
        response = client.get("/pose/zones/summary")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "total_persons" in data
        assert "zones" in data
    
    def test_stream_status_endpoint_should_fail_initially(self, client):
        """Test stream status endpoint - should fail initially."""
        response = client.get("/stream/status")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "is_active" in data
        assert "connected_clients" in data
    
    def test_stream_start_endpoint_should_fail_initially(self, client):
        """Test stream start endpoint - should fail initially."""
        response = client.post("/stream/start")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "message" in data
    
    def test_stream_stop_endpoint_should_fail_initially(self, client):
        """Test stream stop endpoint - should fail initially."""
        response = client.post("/stream/stop")
        
        # This will fail initially
        assert response.status_code == 200
        data = response.json()
        assert "message" in data


class TestAPIErrorHandling:
    """Test API error handling scenarios."""
    
    @pytest.fixture
    def app_with_failing_services(self):
        """Create app with failing service dependencies."""
        app = FastAPI()
        app.include_router(health_router, prefix="/health", tags=["health"])
        app.include_router(pose_router, prefix="/pose", tags=["pose"])
        
        # Mock failing services
        failing_pose_service = AsyncMock()
        failing_pose_service.health_check.side_effect = Exception("Service unavailable")
        
        app.dependency_overrides[get_pose_service] = lambda: failing_pose_service
        
        return app
    
    def test_health_check_with_failing_service_should_fail_initially(self, app_with_failing_services):
        """Test health check with failing service - should fail initially."""
        with TestClient(app_with_failing_services) as client:
            response = client.get("/health/health")
            
            # This will fail initially
            assert response.status_code == 200
            data = response.json()
            assert data["status"] == "unhealthy"
            assert "hardware" in data["components"]
            assert data["components"]["pose"]["status"] == "unhealthy"


class TestAPIAuthentication:
    """Test API authentication scenarios."""
    
    @pytest.fixture
    def app_with_auth(self):
        """Create app with authentication enabled."""
        app = FastAPI()
        app.include_router(pose_router, prefix="/pose", tags=["pose"])
        
        # Mock authenticated user dependency
        def get_authenticated_user():
            return {
                "id": "auth-user-001",
                "username": "authuser",
                "is_admin": True,
                "permissions": ["read", "write", "admin"]
            }
        
        app.dependency_overrides[get_current_user] = get_authenticated_user
        
        return app
    
    def test_authenticated_endpoint_access_should_fail_initially(self, app_with_auth):
        """Test authenticated endpoint access - should fail initially."""
        with TestClient(app_with_auth) as client:
            response = client.post("/pose/analyze", json={
                "confidence_threshold": 0.8,
                "include_keypoints": True
            })
            
            # This will fail initially
            assert response.status_code == 200


class TestAPIValidation:
    """Test API request validation."""
    
    @pytest.fixture
    def validation_app(self):
        """Create app for validation testing."""
        app = FastAPI()
        app.include_router(pose_router, prefix="/pose", tags=["pose"])
        
        # Mock service
        mock_service = AsyncMock()
        app.dependency_overrides[get_pose_service] = lambda: mock_service
        
        return app
    
    def test_invalid_confidence_threshold_should_fail_initially(self, validation_app):
        """Test invalid confidence threshold validation - should fail initially."""
        with TestClient(validation_app) as client:
            response = client.post("/pose/analyze", json={
                "confidence_threshold": 1.5,  # Invalid: > 1.0
                "include_keypoints": True
            })
            
            # This will fail initially
            assert response.status_code == 422
            assert "validation error" in response.json()["detail"][0]["msg"].lower()
    
    def test_invalid_max_persons_should_fail_initially(self, validation_app):
        """Test invalid max_persons validation - should fail initially."""
        with TestClient(validation_app) as client:
            response = client.post("/pose/analyze", json={
                "max_persons": 0,  # Invalid: < 1
                "include_keypoints": True
            })
            
            # This will fail initially
            assert response.status_code == 422