# app/main.py
# Lojiz Platform + Aida AI - Graph-Based Architecture (v1 Primary)

from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from fastapi.exceptions import RequestValidationError
from slowapi import _rate_limit_exceeded_handler
from slowapi.errors import RateLimitExceeded
from slowapi.middleware import SlowAPIMiddleware
from app.middleware import limiter, rate_limit_exceeded_handler
from contextlib import asynccontextmanager
import logging
import os

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# ============================================================
# SENTRY INTEGRATION - Error Monitoring
# ============================================================
import sentry_sdk
from sentry_sdk.integrations.fastapi import FastApiIntegration
from sentry_sdk.integrations.starlette import StarletteIntegration

def init_sentry():
    """Initialize Sentry for production error monitoring"""
    sentry_dsn = os.getenv("SENTRY_DSN", "")
    environment = os.getenv("ENVIRONMENT", "development")
    
    if sentry_dsn and environment == "production":
        sentry_sdk.init(
            dsn=sentry_dsn,
            environment=environment,
            integrations=[
                FastApiIntegration(transaction_style="endpoint"),
                StarletteIntegration(transaction_style="endpoint"),
            ],
            # Performance monitoring
            traces_sample_rate=0.2,  # 20% of transactions
            # Error sampling
            profiles_sample_rate=0.1,  # 10% of profiled transactions
            # Don't send PII
            send_default_pii=False,
            # Release version
            release=os.getenv("APP_VERSION", "1.0.0"),
        )
        logger.info("✅ Sentry initialized for production monitoring")
    elif sentry_dsn:
        logger.info(f"⚠️ Sentry DSN set but environment is {environment} - not initializing")
    else:
        logger.info("ℹ️ Sentry DSN not configured - error monitoring disabled")

# Initialize Sentry before app startup
init_sentry()

# CORE IMPORTS
try:
    from app.config import settings
    from app.database import connect_db, disconnect_db, ensure_indexes as ensure_auth_indexes, ensure_review_indexes
    from app.routes import auth
except ImportError as e:
    logger.error(f"Core import error: {e}")
    raise

try:
    from app.core.exceptions import AuthException
except ImportError:
    AuthException = Exception

# ============================================================
# AI IMPORTS - GRAPH-BASED ARCHITECTURE
# ============================================================
try:
    from app.ai.routes.chat import router as ai_chat_router
    from app.ai.config import (
        validate_ai_startup,
        check_redis_health,
        check_qdrant_health,
        redis_client,
        qdrant_client,
    )
    from app.ai.memory.redis_context_memory import get_memory_manager
    from app.ml.models.ml_listing_extractor import get_ml_extractor
    logger.info("✅ Graph-based AI architecture loaded")
except ImportError as e:
    logger.error(f"AI import error: {e}")
    raise

from app.models.listing import ensure_listing_indexes

# ENVIRONMENT
environment = os.getenv("ENVIRONMENT", "development")
is_production = environment == "production"

# LIFESPAN
@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan - startup and shutdown"""
    logger.info("=" * 70)
    logger.info("🚀 Starting Lojiz Platform + Aida AI")
    logger.info("   Architecture: Graph-Based (State Machine + Validation)")
    logger.info("   Primary Endpoint: /ai/v1 (Graph-Based)")
    logger.info("   Fallback Endpoint: /ai/v2 (Legacy)")
    logger.info("=" * 70)

    # STARTUP
    try:
        logger.info("Connecting to MongoDB...")
        await connect_db()
        await ensure_auth_indexes()
        await ensure_listing_indexes()
        await ensure_review_indexes()
        
        # Import and create chat indexes
        from app.database import ensure_chat_indexes
        await ensure_chat_indexes()
        
        logger.info("✅ MongoDB connected and indexed")
    except Exception as e:
        logger.critical(f"❌ MongoDB connection failed - aborting startup: {e}")
        raise

    try:
        logger.info("Connecting to Redis...")
        if redis_client:
            await redis_client.ping()
            logger.info("✅ Redis connected")
        else:
            logger.warning("⚠️ Redis not available (optional)")
    except Exception as e:
        logger.warning(f"⚠️ Redis connection failed (continuing without): {e}")

    try:
        logger.info("Connecting to Qdrant...")
        if qdrant_client:
            await qdrant_client.get_collections()
            logger.info("✅ Qdrant connected")
        else:
            logger.warning("⚠️ Qdrant not available (optional)")
    except Exception as e:
        logger.warning(f"⚠️ Qdrant connection failed (continuing without): {e}")

    try:
        logger.info("Validating AI components...")
        ai_checks = await validate_ai_startup()
        logger.info("✅ AI components validated")
    except Exception as e:
        logger.warning(f"⚠️ AI validation warning: {e}")

    try:
        logger.info("Initializing ML Extractor...")
        ml = get_ml_extractor()
        logger.info("✅ ML Extractor ready")
    except Exception as e:
        logger.warning(f"⚠️ ML Extractor initialization warning: {e}")

    try:
        logger.info("Initializing Memory Manager...")
        manager = get_memory_manager()
        logger.info("✅ Memory Manager ready")
    except Exception as e:
        logger.warning(f"⚠️ Memory Manager initialization warning: {e}")

    # Initialize Distributed Chat (Redis Pub/Sub)
    try:
        from app.routes.websocket_chat import chat_manager
        await chat_manager.initialize()
        logger.info("✅ Redis Pub/Sub for Chat initialized")
    except Exception as e:
        logger.warning(f"⚠️ Chat manager init failed: {e}")

    logger.info("=" * 70)
    logger.info("✅ APPLICATION READY - Graph-Based Architecture Active!")
    logger.info("=" * 70)

    yield

    # SHUTDOWN
    logger.info("=" * 70)
    logger.info("🛑 Shutting down Lojiz Platform + Aida AI")
    logger.info("=" * 70)

    try:
        try:
            ml = get_ml_extractor()
            ml.currency_mgr.clear_cache()
            logger.info("✅ ML caches cleared")
        except Exception as e:
            logger.debug(f"ML cache clear skipped: {e}")

        from app.database import disconnect_db
        await disconnect_db()
        logger.info("✅ MongoDB disconnected")

        if redis_client:
            await redis_client.close()
            logger.info("✅ Redis closed")

        logger.info("✅ Shutdown complete")
    except Exception as e:
        logger.warning(f"⚠️ Shutdown warning: {e}")


# FASTAPI SETUP
app = FastAPI(
    title="Lojiz Platform + Aida AI",
    description="Real-estate platform with conversational AI assistant (Graph-Based Architecture)",
    version="2.0.0",
    lifespan=lifespan,
)

# RATE LIMITING
app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, rate_limit_exceeded_handler)
app.add_middleware(SlowAPIMiddleware)

# CORS - Allow all localhost ports in development
if is_production:
    cors_origins = [
        "https://lojiz.onrender.com",
        "https://lojiz.com",
        "https://www.lojiz.com",
    ]
    cors_origin_regex = None
else:
    # Development - allow any localhost port (Flutter uses random ports like 50421)
    cors_origins = [
        "http://localhost",
        "http://127.0.0.1",
    ]
    # Regex to match localhost with any port
    cors_origin_regex = r"^https?://(localhost|127\.0\.0\.1)(:\d+)?$"

app.add_middleware(
    CORSMiddleware,
    allow_origins=cors_origins,
    allow_origin_regex=cors_origin_regex,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
    expose_headers=["*"],
    max_age=600,
)

# EXCEPTION HANDLERS
@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    logger.error(f"Validation error: {exc}")
    errors = []
    for error in exc.errors():
        field = ".".join(str(loc) for loc in error["loc"][1:])
        errors.append({"field": field, "message": error["msg"]})
    return JSONResponse(
        status_code=400,
        content={
            "success": False,
            "message": "Validation error. Please check your input.",
            "error_code": "VALIDATION_ERROR",
            "errors": errors,
        },
    )


@app.exception_handler(AuthException)
async def auth_exception_handler(request: Request, exc: AuthException): # type: ignore
    logger.warning(f"Auth error [{exc.error_code}]: {exc.message}")
    response = {"success": False, "message": exc.message, "error_code": exc.error_code}
    if exc.data:
        response["data"] = exc.data
    return JSONResponse(status_code=exc.status_code, content=response)


# ROUTERS
logger.info("=" * 70)
logger.info("Registering routers...")
logger.info("=" * 70)

# Authentication
app.include_router(auth.router, prefix="/api/auth", tags=["Authentication"])

# AI CHAT ROUTES (Two distinct systems)
# 1. AIDA Chat Screen - Full Agent (/ai/ask)
# 2. AIDA DM - Simple Agent (/ai/dm)

try:
    from app.ai.routes.chat import router as ai_chat_router
    from app.ai.routes.dm import router as ai_dm_router
    
    # Register main chat (/ai/ask)
    app.include_router(
        ai_chat_router,
        prefix="/ai",
        tags=["AIDA AI Chat (Full Agent / Chat Screen)"]
    )
    
    # Register DM agent (/ai/dm)
    app.include_router(
        ai_dm_router,
        prefix="/ai",
        tags=["AIDA AI DM (Conversational / Alert Agent)"]
    )
    
    logger.info("✅ AIDA AI Chat registered at /ai/ask (Graph-Based)")
    logger.info("✅ AIDA AI DM registered at /ai/dm (One-Shot)")
except ImportError as e:
    logger.error(f"❌ AI Chat/DM import error: {e}")

# AIDA Translation
try:
    from app.ai.routes.translate import router as translate_router
    app.include_router(translate_router, prefix="/api", tags=["AIDA Translate"])
    logger.info("✅ AIDA Translation registered at /api/translate")
except Exception as e:
    logger.error(f"❌ AIDA Translation import error: {e}")

# ============================================================
# LISTING ROUTERS
# ============================================================
from app.routes.listing import router as listing_router
from app.routes.media_upload import router as media_router
from app.routes.user_public import router as user_public_router
from app.routes.websocket_listings import router as ws_router
from app.routes.websocket_chat import router as ws_chat_router
from app.routes.reviews import router as reviews_router
from app.routes.search import router as search_router
from app.routes.conversations import router as conversations_router
from app.routes.wishlist import router as wishlist_router

app.include_router(listing_router, prefix="/api/listings", tags=["Listings"])
app.include_router(media_router, tags=["Media Upload & Analysis"])
app.include_router(user_public_router, prefix="/api/users", tags=["Users"])
app.include_router(ws_router, tags=["WebSocket Listings"])
app.include_router(ws_chat_router, tags=["WebSocket Chat"])
app.include_router(reviews_router, prefix="/api/reviews", tags=["Reviews"])
app.include_router(search_router, prefix="/api/search", tags=["AIDA Search"])
app.include_router(conversations_router, prefix="/api/conversations", tags=["Conversations"])
app.include_router(wishlist_router, prefix="/api/wishlist", tags=["Wishlist"])
logger.info("✅ Conversations router registered at /api/conversations")
logger.info("✅ Wishlist router registered at /api/wishlist")

# ============================================================
# VOICE ROUTES (AIDA Voice Messaging)
# ============================================================
try:
    from app.routes.voice import router as voice_router
    from app.routes.voice_call_ws import router as voice_call_ws_router
    app.include_router(voice_router, prefix="/api", tags=["Voice"])
    app.include_router(voice_call_ws_router, tags=["Voice Call WebSocket"])
    logger.info("✅ Voice router registered at /api/voice")
    logger.info("✅ Voice Call WebSocket registered at /ws/voice-call")
except ImportError as e:
    logger.warning(f"⚠️ Voice router not available: {e}")

logger.info("=" * 70)
logger.info("✅ All routers registered successfully")
logger.info("=" * 70)


# ENDPOINTS

@app.get("/health", tags=["Health"])
async def health_check():
    """Health check endpoint"""
    try:
        redis_ok = False
        if redis_client:
            try:
                await redis_client.ping()
                redis_ok = True
            except Exception:
                redis_ok = False

        qdrant_ok = False
        if qdrant_client:
            try:
                await qdrant_client.get_collections()
                qdrant_ok = True
            except Exception:
                qdrant_ok = False

        try:
            ml = get_ml_extractor()
            ml_ok = ml is not None
        except Exception:
            ml_ok = False

        return {
            "status": "healthy",
            "service": "Lojiz Platform + Aida AI",
            "version": "2.0.0",
            "architecture": "Graph-Based (State Machine + Validation)",
            "environment": environment,
            "ai_endpoints": {
                "primary": "/ai/v1 (Graph-Based)",
                "fallback": "/ai/v2 (Legacy)",
            },
            "components": {
                "mongodb": "connected",
                "redis": "connected" if redis_ok else "disconnected",
                "qdrant": "connected" if qdrant_ok else "disconnected",
                "ml": "ready" if ml_ok else "not ready",
            }
        }
    except Exception as e:
        logger.error(f"Health check failed: {e}")
        return {
            "status": "unhealthy",
            "error": str(e),
        }


@app.get("/", tags=["Root"])
async def root():
    """Root endpoint - API information"""
    return {
        "name": "AIDA",
        "tagline": "Your AI Real Estate Agent",
        "platform": "Lojiz",
        "version": "2.0.0",
        "status": "operational",
        "environment": environment,
        "endpoints": {
            "chat": "/ai/ask",
            "dm": "/ai/dm",
            "health": "/health",
            "docs": "/docs",
        },
        "capabilities": [
            "Natural language property search",
            "Intelligent listing creation",
            "Real-time market insights",
            "Multi-language support (EN/FR)",
            "Voice message processing",
        ],
        "powered_by": "LangGraph State Machine",
        "made_with": "FastAPI + MongoDB + Redis",
    }


@app.options("/{full_path:path}", include_in_schema=False)
async def options_handler(full_path: str):
    """Handle CORS preflight requests"""
    return JSONResponse(status_code=200, content={})


# RUN
# To run this application:
# Development: uvicorn app.main:app --reload
# Production: gunicorn -w 4 -k uvicorn.workers.UvicornWorker app.main:app
# HF Spaces: python app.py