"""
Main FastAPI application.
"""

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
import logging

from app.core.config import settings
from app.core.middleware import SecurityHeadersMiddleware, CSRFProtectionMiddleware
from app.api.v1.api import api_router

# Configure logging
logging.basicConfig(
    level=getattr(logging, settings.LOG_LEVEL.upper()),
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)

logger = logging.getLogger(__name__)


def create_application() -> FastAPI:
    """Create and configure FastAPI application"""

    app = FastAPI(
        title=settings.APP_NAME,
        version=settings.APP_VERSION,
        description="Multi-tenant POP3/IMAP to Gmail forwarder with subscription management",
        docs_url="/api/docs",
        redoc_url="/api/redoc",
        openapi_url="/api/openapi.json",
    )

    # Security middleware (add before CORS)
    app.add_middleware(SecurityHeadersMiddleware)
    app.add_middleware(CSRFProtectionMiddleware)

    # CORS middleware
    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.CORS_ORIGINS,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    # Include API router
    app.include_router(api_router, prefix=settings.API_V1_PREFIX)

    @app.get("/")
    async def root():
        """Root endpoint"""
        return {
            "message": "POP3 Forwarder SaaS API",
            "version": settings.APP_VERSION,
            "docs": "/api/docs",
        }

    @app.get("/health")
    async def health_check():
        """Health check endpoint for container orchestration"""
        return {"status": "healthy"}

    @app.on_event("startup")
    async def startup_event():
        """Run on application startup"""
        logger.info(f"Starting {settings.APP_NAME} v{settings.APP_VERSION}")
        logger.info(f"Debug mode: {settings.DEBUG}")
        logger.info("API documentation: /api/docs")

    @app.on_event("shutdown")
    async def shutdown_event():
        """Run on application shutdown"""
        logger.info("Shutting down application")

    return app


app = create_application()