"""FastAPI 入口。

通过 `uvicorn app.main:app --reload` 启动。
"""
from __future__ import annotations

import logging
from collections.abc import AsyncIterator
from contextlib import asynccontextmanager

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

from app.api.v1.auth import router as auth_router
from app.core.config import settings
from app.core.logging import setup_logging

setup_logging(debug=settings.APP_DEBUG)
logger = logging.getLogger("shagua.main")


@asynccontextmanager
async def lifespan(_: FastAPI) -> AsyncIterator[None]:
    # 提示而非强制建表:生产用 alembic upgrade head,本地 dev 也建议先跑一次 migration。
    # 这里只 log,不自动 create_all,避免生产环境意外建出过时 schema。
    logger.info(
        "started env=%s debug=%s db=%s",
        settings.APP_ENV,
        settings.APP_DEBUG,
        settings.DATABASE_URL.split("://", 1)[0],
    )
    yield
    logger.info("shutting down")


app = FastAPI(
    title=settings.APP_NAME,
    version="0.1.0",
    docs_url="/docs" if not settings.is_prod else None,
    redoc_url="/redoc" if not settings.is_prod else None,
    lifespan=lifespan,
)

if settings.cors_origins_list:
    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.cors_origins_list,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )


@app.get("/health", tags=["meta"])
def health() -> dict[str, str]:
    return {"status": "ok"}


app.include_router(auth_router)