import sys
from contextlib import asynccontextmanager

import uvicorn
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from loguru import logger

from app.api import router as api_router
from app.config import settings
from app.database import check_database, engine
from app.dependencies import build_container


def configure_logging() -> None:
    """集中配置 loguru sink；由 create_app 显式调用，避免 import-time 副作用。"""
    logger.remove()
    logger.add(
        sys.stderr,
        format=(
            "<green>{time:YYYY-MM-DD HH:mm:ss}</green> | "
            "<level>{level: <8}</level> | "
            "<cyan>{name}</cyan>:<cyan>{function}</cyan> - <level>{message}</level>"
        ),
    )


@asynccontextmanager
async def lifespan(app: FastAPI):
    await check_database()
    logger.info(
        "Database connection verified; ensure schema is applied with "
        "`alembic upgrade head` before serving traffic"
    )
    container = build_container(settings)
    app.state.container = container
    await container.start()
    try:
        yield
    finally:
        await container.shutdown()
        await engine.dispose()
        logger.info("Database engine disposed")


def create_app() -> FastAPI:
    configure_logging()
    application = FastAPI(
        title="Operation Room Monitor",
        lifespan=lifespan,
    )
    if settings.demo_cors_enabled:
        origins = settings.parsed_demo_cors_origins()
        if origins:
            application.add_middleware(
                CORSMiddleware,
                allow_origins=origins,
                allow_credentials=origins != ["*"],
                allow_methods=["*"],
                allow_headers=["*"],
            )
            logger.info("CORS enabled for demo client; origins={}", origins)
    application.include_router(api_router)
    if settings.demo_orchestrator_enabled:
        from app.routers import demo_orch

        application.include_router(demo_orch.router)
        logger.info(
            "Demo orchestrator enabled: POST /internal/demo/orchestrate-and-start",
        )
    else:
        logger.info(
            "Demo orchestrator disabled (DEMO_ORCHESTRATOR_ENABLED=false): "
            "GET /internal/demo/orchestrator-status for status; "
            "POST /internal/demo/orchestrate-and-start is not registered",
        )
    return application


app = create_app()


def main() -> None:
    uvicorn.run(
        "main:app",
        host=settings.server_host,
        port=settings.server_port,
        reload=False,
    )


if __name__ == "__main__":
    main()