"""
FastAPI Application Entry Point
Integrated API Gateway + Telegram Bot
"""

import logging
import warnings
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from app.core.config import settings
from app.db.database import engine, Base, get_db
from app.security.middleware import add_security_middleware
from app.api import transactions, auth
import redis

# Suppress Pydantic V2 migration warnings
warnings.filterwarnings('ignore', message="Valid config keys have changed in V2")

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

# Redis client
redis_client = redis.from_url(settings.redis_url)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """
    Startup/Shutdown events
    """
    # === STARTUP ===
    logger.info("🚀 Application starting...")
    
    # Create database tables (if not exist)
    Base.metadata.create_all(bind=engine)
    logger.info("✅ Database initialized")
    
    # Verify Redis connection
    try:
        redis_client.ping()
        logger.info("✅ Redis connected")
    except Exception as e:
        logger.error(f"❌ Redis connection failed: {e}")
    
    yield
    
    # === SHUTDOWN ===
    logger.info("🛑 Application shutting down...")
    redis_client.close()
    logger.info("✅ Cleanup complete")


# Create FastAPI application
app = FastAPI(
    title="Finance Bot API",
    description="API-First Zero-Trust Architecture for Family Finance Management",
    version="1.0.0",
    lifespan=lifespan,
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_allowed_origins,
    allow_credentials=settings.cors_allow_credentials,
    allow_methods=settings.cors_allow_methods,
    allow_headers=settings.cors_allow_headers,
)

# Add security middleware
add_security_middleware(app, redis_client, next(get_db()))

# Include API routers
app.include_router(auth.router)
app.include_router(transactions.router)


# ========== Health Check ==========
@app.get("/health", tags=["health"])
async def health_check():
    """
    Health check endpoint.
    No authentication required.
    """
    return {
        "status": "ok",
        "environment": settings.app_env,
        "version": "1.0.0",
    }


# ========== Graceful Shutdown ==========
import signal
import asyncio

async def shutdown_handler(sig):
    """Handle graceful shutdown"""
    logger.info(f"Received signal {sig}, shutting down...")
    
    # Close connections
    redis_client.close()
    
    # Exit
    return 0