"""
FastAPI Application - Main Entry Point
"""
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from app.core.config import get_settings
from app.core.logging import get_logger, setup_logging
from app.presentation.api.v1.endpoints import router as api_router

settings = get_settings()
setup_logging(settings.log_level)
logger = get_logger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager"""
    logger.info("application_startup", version=settings.app_version, env=settings.environment)

    # TODO: Initialize database connection pool
    # TODO: Initialize Qdrant collection
    # TODO: Warm up embedding model

    yield

    # Cleanup
    logger.info("application_shutdown")


app = FastAPI(
    title=settings.app_name,
    version=settings.app_version,
    description="Production-ready RAG backend for corporate employee onboarding",
    lifespan=lifespan,
)

# CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins,
    allow_credentials=settings.cors_allow_credentials,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(api_router)


@app.get("/")
async def root():
    """Root endpoint"""
    return {
        "service": settings.app_name,
        "version": settings.app_version,
        "status": "running",
        "environment": settings.environment,
    }


@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    """Global exception handler"""
    logger.error("unhandled_exception", error=str(exc), exc_info=True)
    return JSONResponse(
        status_code=500,
        content={"error": "Internal server error", "detail": str(exc)},
    )


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(
        "app.main:app",
        host=settings.host,
        port=settings.port,
        reload=settings.debug,
        log_level=settings.log_level.lower(),
    )