"""
Integration tests for end-to-end functionality
"""

import pytest
import asyncio
from unittest.mock import patch, AsyncMock, MagicMock
from typing import Dict, Any, List

class TestEndToEndUserJourney:
    """Test complete user journey scenarios"""
    
    @pytest.mark.asyncio
    async def test_complete_search_journey(self, async_client, sample_merchant_data):
        """Test complete user search journey from query to results"""
        # Mock all dependencies
        with patch('app.services.advanced_nlp.advanced_nlp_pipeline') as mock_nlp, \
             patch('app.services.merchant.search_merchants') as mock_search:
            
            # Setup NLP pipeline mock
            mock_nlp.process_query.return_value = {
                "query": "find the best hair salon near me with parking",
                "primary_intent": {"intent": "SEARCH_SERVICE", "confidence": 0.9},
                "entities": {
                    "service_types": ["haircut", "hair styling"],
                    "amenities": ["parking"],
                    "location_modifiers": ["near me"],
                    "quality_indicators": ["best"]
                },
                "similar_services": [("salon", 0.95), ("beauty", 0.8)],
                "search_parameters": {
                    "merchant_category": "salon",
                    "amenities": ["parking"],
                    "radius": 5000,
                    "min_rating": 4.0
                },
                "processing_time": 0.234
            }
            
            # Setup merchant search mock
            mock_search.return_value = [sample_merchant_data]
            
            # Step 1: User submits natural language query
            nlp_response = await async_client.post("/api/v1/nlp/analyze-query", params={
                "query": "find the best hair salon near me with parking",
                "latitude": 40.7128,
                "longitude": -74.0060
            })
            
            assert nlp_response.status_code == 200
            nlp_data = nlp_response.json()
            assert nlp_data["status"] == "success"
            assert "analysis" in nlp_data
            
            # Step 2: Use NLP results to search merchants
            search_params = nlp_data["analysis"]["search_parameters"]
            search_response = await async_client.get("/api/v1/merchants/search", params={
                "latitude": 40.7128,
                "longitude": -74.0060,
                **search_params
            })
            
            assert search_response.status_code == 200
            search_data = search_response.json()
            assert len(search_data) == 1
            assert search_data[0]["name"] == "Test Hair Salon"
            assert "parking" in search_data[0]["amenities"]
    
    @pytest.mark.asyncio
    async def test_merchant_discovery_flow(self, async_client, sample_merchant_data):
        """Test merchant discovery and detail retrieval flow"""
        with patch('app.services.merchant.get_merchants') as mock_get_all, \
             patch('app.services.merchant.get_merchant_by_id') as mock_get_by_id:
            
            mock_get_all.return_value = [sample_merchant_data]
            mock_get_by_id.return_value = sample_merchant_data
            
            # Step 1: Browse all merchants
            browse_response = await async_client.get("/api/v1/merchants/")
            assert browse_response.status_code == 200
            merchants = browse_response.json()
            assert len(merchants) == 1
            
            # Step 2: Get detailed information for specific merchant
            merchant_id = merchants[0]["_id"]
            detail_response = await async_client.get(f"/api/v1/merchants/{merchant_id}")
            assert detail_response.status_code == 200
            
            merchant_detail = detail_response.json()
            assert merchant_detail["_id"] == merchant_id
            assert merchant_detail["name"] == "Test Hair Salon"
            assert "services" in merchant_detail
            assert "business_hours" in merchant_detail
    
    @pytest.mark.asyncio
    async def test_error_recovery_flow(self, async_client):
        """Test error recovery and graceful degradation"""
        # Test NLP service failure with fallback
        with patch('app.services.advanced_nlp.advanced_nlp_pipeline') as mock_nlp, \
             patch('app.services.helper.process_free_text') as mock_fallback:
            
            # NLP service fails
            mock_nlp.process_query.side_effect = Exception("NLP service unavailable")
            
            # Fallback service works
            mock_fallback.return_value = {
                "query": "hair salon",
                "extracted_keywords": ["hair", "salon"],
                "suggested_category": "salon"
            }
            
            # Should gracefully fall back to basic processing
            response = await async_client.post("/api/v1/helpers/process-text", json={
                "text": "hair salon",
                "latitude": 40.7128,
                "longitude": -74.0060
            })
            
            assert response.status_code == 200
            data = response.json()
            assert data["suggested_category"] == "salon"

class TestServiceIntegration:
    """Test integration between different services"""
    
    @pytest.mark.asyncio
    async def test_nlp_to_search_integration(self, sample_merchant_data):
        """Test integration between NLP processing and merchant search"""
        from app.services.advanced_nlp import AdvancedNLPPipeline
        from app.services.merchant import search_merchants
        
        with patch('app.repositories.db_repository.search_merchants_in_db') as mock_db_search:
            mock_db_search.return_value = [sample_merchant_data]
            
            # Process query with NLP
            pipeline = AdvancedNLPPipeline()
            nlp_result = await pipeline.process_query("find a hair salon with parking")
            
            # Use NLP results for merchant search
            search_params = nlp_result["search_parameters"]
            merchants = await search_merchants(**search_params)
            
            assert len(merchants) == 1
            assert merchants[0]["category"] == "salon"
    
    @pytest.mark.asyncio
    async def test_cache_integration(self, sample_merchant_data):
        """Test cache integration across services"""
        from app.services.merchant import get_merchant_by_id
        from app.repositories.cache_repository import cache_merchant_data, get_cached_merchant_data
        
        with patch('app.nosql.get_redis_client') as mock_redis_client, \
             patch('app.repositories.db_repository.get_merchant_by_id_from_db') as mock_db:
            
            mock_redis = AsyncMock()
            mock_redis_client.return_value = mock_redis
            mock_db.return_value = sample_merchant_data
            
            # First call - cache miss, should hit database
            mock_redis.get.return_value = None
            result1 = await get_merchant_by_id("test_merchant_123")
            
            # Should cache the result
            mock_redis.setex.assert_called_once()
            
            # Second call - cache hit, should not hit database
            mock_redis.get.return_value = '{"_id": "test_merchant_123", "name": "Test Hair Salon"}'
            result2 = await get_merchant_by_id("test_merchant_123")
            
            assert result1 is not None
            assert result2 is not None
    
    @pytest.mark.asyncio
    async def test_database_to_api_integration(self, sample_merchant_data):
        """Test integration from database layer to API layer"""
        from app.repositories.db_repository import get_merchants_from_db
        from app.services.merchant import get_merchants
        
        with patch('app.nosql.get_mongodb_client') as mock_client:
            mock_collection = AsyncMock()
            mock_client.return_value.__getitem__.return_value.__getitem__.return_value = mock_collection
            mock_collection.find.return_value.limit.return_value.skip.return_value.to_list.return_value = [sample_merchant_data]
            
            # Database layer
            db_result = await get_merchants_from_db(limit=10, skip=0)
            
            # Service layer
            service_result = await get_merchants(limit=10, skip=0)
            
            assert len(db_result) == 1
            assert len(service_result) == 1
            assert db_result[0]["name"] == service_result[0]["name"]

class TestDataFlowIntegration:
    """Test data flow through the entire system"""
    
    @pytest.mark.asyncio
    async def test_search_data_flow(self, async_client, sample_merchant_data):
        """Test complete search data flow"""
        with patch('app.nosql.get_mongodb_client') as mock_mongo, \
             patch('app.nosql.get_redis_client') as mock_redis_client:
            
            # Setup MongoDB mock
            mock_collection = AsyncMock()
            mock_mongo.return_value.__getitem__.return_value.__getitem__.return_value = mock_collection
            mock_collection.find.return_value.limit.return_value.to_list.return_value = [sample_merchant_data]
            
            # Setup Redis mock
            mock_redis = AsyncMock()
            mock_redis_client.return_value = mock_redis
            mock_redis.get.return_value = None  # Cache miss
            
            # Make search request
            response = await async_client.get("/api/v1/merchants/search", params={
                "latitude": 40.7128,
                "longitude": -74.0060,
                "radius": 5000,
                "category": "salon"
            })
            
            assert response.status_code == 200
            data = response.json()
            assert len(data) == 1
            assert data[0]["name"] == "Test Hair Salon"
            
            # Verify data flowed through all layers
            mock_collection.find.assert_called_once()  # Database was queried
            mock_redis.setex.assert_called_once()      # Result was cached
    
    @pytest.mark.asyncio
    async def test_nlp_processing_data_flow(self, async_client):
        """Test NLP processing data flow"""
        with patch('app.services.advanced_nlp.IntentClassifier') as mock_intent, \
             patch('app.services.advanced_nlp.BusinessEntityExtractor') as mock_entity, \
             patch('app.services.advanced_nlp.SemanticMatcher') as mock_semantic:
            
            # Setup mocks
            mock_intent_instance = MagicMock()
            mock_intent.return_value = mock_intent_instance
            mock_intent_instance.get_primary_intent.return_value = ("SEARCH_SERVICE", 0.9)
            
            mock_entity_instance = MagicMock()
            mock_entity.return_value = mock_entity_instance
            mock_entity_instance.extract_entities.return_value = {"service_types": ["haircut"]}
            
            mock_semantic_instance = MagicMock()
            mock_semantic.return_value = mock_semantic_instance
            mock_semantic_instance.find_similar_services.return_value = [("salon", 0.9)]
            
            response = await async_client.post("/api/v1/nlp/analyze-query", params={
                "query": "find a hair salon"
            })
            
            assert response.status_code == 200
            data = response.json()
            assert data["status"] == "success"
            
            # Verify data flowed through NLP pipeline
            mock_intent_instance.get_primary_intent.assert_called_once()
            mock_entity_instance.extract_entities.assert_called_once()
            mock_semantic_instance.find_similar_services.assert_called_once()

class TestConcurrencyIntegration:
    """Test concurrent operations and race conditions"""
    
    @pytest.mark.asyncio
    async def test_concurrent_cache_operations(self, sample_merchant_data):
        """Test concurrent cache read/write operations"""
        from app.repositories.cache_repository import cache_merchant_data, get_cached_merchant_data
        
        with patch('app.nosql.get_redis_client') as mock_redis_client:
            mock_redis = AsyncMock()
            mock_redis_client.return_value = mock_redis
            mock_redis.setex.return_value = True
            mock_redis.get.return_value = '{"_id": "test_merchant_123", "name": "Test Hair Salon"}'
            
            # Create concurrent cache operations
            cache_tasks = [
                cache_merchant_data(f"merchant_{i}", sample_merchant_data)
                for i in range(10)
            ]
            
            read_tasks = [
                get_cached_merchant_data(f"merchant_{i}")
                for i in range(10)
            ]
            
            # Execute concurrently
            cache_results = await asyncio.gather(*cache_tasks)
            read_results = await asyncio.gather(*read_tasks)
            
            assert all(result is True for result in cache_results)
            assert all(result is not None for result in read_results)
    
    @pytest.mark.asyncio
    async def test_concurrent_nlp_processing(self):
        """Test concurrent NLP processing"""
        from app.services.advanced_nlp import AdvancedNLPPipeline
        
        pipeline = AdvancedNLPPipeline()
        queries = [
            "find a hair salon",
            "best spa near me",
            "gym with parking",
            "dental clinic",
            "massage therapy"
        ]
        
        # Process queries concurrently
        tasks = [pipeline.process_query(query) for query in queries]
        results = await asyncio.gather(*tasks)
        
        assert len(results) == 5
        assert all("query" in result for result in results)
        assert all("primary_intent" in result for result in results)
    
    @pytest.mark.asyncio
    async def test_concurrent_database_operations(self, sample_merchant_data):
        """Test concurrent database operations"""
        from app.repositories.db_repository import get_merchant_by_id_from_db, search_merchants_in_db
        
        with patch('app.nosql.get_mongodb_client') as mock_client:
            mock_collection = AsyncMock()
            mock_client.return_value.__getitem__.return_value.__getitem__.return_value = mock_collection
            mock_collection.find_one.return_value = sample_merchant_data
            mock_collection.find.return_value.limit.return_value.to_list.return_value = [sample_merchant_data]
            
            # Mix of different database operations
            tasks = []
            
            # Add get by ID tasks
            for i in range(5):
                tasks.append(get_merchant_by_id_from_db(f"merchant_{i}"))
            
            # Add search tasks
            for i in range(5):
                tasks.append(search_merchants_in_db(
                    latitude=40.7128 + (i * 0.01),
                    longitude=-74.0060 + (i * 0.01),
                    radius=5000
                ))
            
            results = await asyncio.gather(*tasks)
            
            assert len(results) == 10
            # First 5 should be single merchants
            assert all(isinstance(result, dict) for result in results[:5])
            # Last 5 should be lists of merchants
            assert all(isinstance(result, list) for result in results[5:])

class TestErrorHandlingIntegration:
    """Test error handling across integrated components"""
    
    @pytest.mark.asyncio
    async def test_database_failure_propagation(self, async_client):
        """Test how database failures propagate through the system"""
        with patch('app.nosql.get_mongodb_client') as mock_client:
            mock_client.side_effect = Exception("Database connection failed")
            
            response = await async_client.get("/api/v1/merchants/")
            assert response.status_code == 500
    
    @pytest.mark.asyncio
    async def test_cache_failure_graceful_degradation(self, async_client, sample_merchant_data):
        """Test graceful degradation when cache fails"""
        with patch('app.nosql.get_redis_client') as mock_redis_client, \
             patch('app.repositories.db_repository.get_merchants_from_db') as mock_db:
            
            # Cache fails
            mock_redis_client.side_effect = Exception("Redis connection failed")
            # Database works
            mock_db.return_value = [sample_merchant_data]
            
            response = await async_client.get("/api/v1/merchants/")
            
            # Should still work, just without caching
            assert response.status_code == 200
            data = response.json()
            assert len(data) == 1
    
    @pytest.mark.asyncio
    async def test_nlp_service_fallback(self, async_client):
        """Test fallback when NLP service fails"""
        with patch('app.services.advanced_nlp.advanced_nlp_pipeline') as mock_nlp, \
             patch('app.services.helper.process_free_text') as mock_fallback:
            
            # NLP service fails
            mock_nlp.process_query.side_effect = Exception("NLP service error")
            
            # Fallback service works
            mock_fallback.return_value = {
                "query": "hair salon",
                "extracted_keywords": ["hair", "salon"],
                "suggested_category": "salon"
            }
            
            # Try NLP endpoint first (should fail)
            nlp_response = await async_client.post("/api/v1/nlp/analyze-query", params={
                "query": "hair salon"
            })
            assert nlp_response.status_code == 500
            
            # Use fallback endpoint (should work)
            fallback_response = await async_client.post("/api/v1/helpers/process-text", json={
                "text": "hair salon",
                "latitude": 40.7128,
                "longitude": -74.0060
            })
            assert fallback_response.status_code == 200

class TestSecurityIntegration:
    """Test security measures across integrated components"""
    
    @pytest.mark.asyncio
    async def test_input_sanitization_flow(self, async_client):
        """Test input sanitization across the request flow"""
        # Test with potentially malicious input
        malicious_query = "<script>alert('xss')</script>find salon"
        
        with patch('app.services.advanced_nlp.advanced_nlp_pipeline') as mock_nlp:
            mock_nlp.process_query.return_value = {
                "query": "find salon",  # Should be sanitized
                "primary_intent": {"intent": "SEARCH_SERVICE", "confidence": 0.8},
                "entities": {},
                "similar_services": [],
                "search_parameters": {},
                "processing_time": 0.1
            }
            
            response = await async_client.post("/api/v1/nlp/analyze-query", params={
                "query": malicious_query
            })
            
            assert response.status_code == 200
            data = response.json()
            # Script tags should be removed/sanitized
            assert "<script>" not in data["analysis"]["query"]
    
    @pytest.mark.asyncio
    async def test_rate_limiting_integration(self, async_client):
        """Test rate limiting across endpoints"""
        # This would require actual rate limiting implementation
        # For now, test that multiple requests don't crash the system
        
        tasks = [
            async_client.get("/health")
            for _ in range(50)
        ]
        
        responses = await asyncio.gather(*tasks, return_exceptions=True)
        
        # All requests should either succeed or be rate limited (not crash)
        for response in responses:
            if hasattr(response, 'status_code'):
                assert response.status_code in [200, 429]  # OK or Too Many Requests

class TestPerformanceIntegration:
    """Test performance characteristics of integrated system"""
    
    @pytest.mark.asyncio
    async def test_end_to_end_performance(self, async_client, sample_merchant_data):
        """Test end-to-end performance of complete user journey"""
        import time
        
        with patch('app.services.advanced_nlp.advanced_nlp_pipeline') as mock_nlp, \
             patch('app.services.merchant.search_merchants') as mock_search:
            
            mock_nlp.process_query.return_value = {
                "query": "find salon",
                "primary_intent": {"intent": "SEARCH_SERVICE", "confidence": 0.8},
                "entities": {"service_types": ["haircut"]},
                "similar_services": [("salon", 0.9)],
                "search_parameters": {"merchant_category": "salon"},
                "processing_time": 0.1
            }
            
            mock_search.return_value = [sample_merchant_data]
            
            start_time = time.time()
            
            # Step 1: NLP processing
            nlp_response = await async_client.post("/api/v1/nlp/analyze-query", params={
                "query": "find a hair salon"
            })
            
            # Step 2: Merchant search
            search_response = await async_client.get("/api/v1/merchants/search", params={
                "category": "salon"
            })
            
            total_time = time.time() - start_time
            
            assert nlp_response.status_code == 200
            assert search_response.status_code == 200
            assert total_time < 3.0  # Complete journey within 3 seconds