"""FastAPI 应用入口。"""

import logging
import os
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from app.config import settings
from app.database import engine, init_db
from app.routes.admin import router as admin_router
from app.routes.compare import router as compare_router
from app.routes.pages import router as pages_router
from app.routes.search import router as search_router
from app.routes.trends import router as trends_router
from app.routes.user import router as user_router

logging.basicConfig(
    level=logging.DEBUG if settings.APP_DEBUG else logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)
logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理：启动与关闭。"""
    # ── startup ──
    from app.services.scheduler import start_scheduler
    from app.services.embedder import init_chroma

    start_scheduler()
    init_chroma()

    yield

    # ── shutdown ──
    from app.services.scheduler import stop_scheduler

    stop_scheduler()


def create_app() -> FastAPI:
    app = FastAPI(
        title="HF Daily Papers",
        description="HuggingFace Daily Papers — 中文论文导览站",
        version="0.1.0",
        lifespan=lifespan,
    )

    # 确保数据目录存在
    os.makedirs(settings.db_path.parent, exist_ok=True)

    # 初始化数据库
    init_db(engine)
    logger.info("Database initialized at %s", settings.db_path)

    # 安全警告
    if settings.ADMIN_TOKEN == "change-me":
        logger.warning(
            "⚠️  ADMIN_TOKEN is the default value 'change-me'. Please change it in .env!"
        )

    if settings.APP_HOST not in ("127.0.0.1", "localhost", "::1"):
        logger.warning(
            "⚠️  APP_HOST=%s is not localhost. "
            "Ensure ADMIN_TOKEN is properly set and access is restricted.",
            settings.APP_HOST,
        )

    # 静态文件
    app.mount("/static", StaticFiles(directory="app/static"), name="static")

    # 论文图片静态服务
    papers_images_dir = os.path.join("data", "papers")
    os.makedirs(papers_images_dir, exist_ok=True)
    app.mount("/papers", StaticFiles(directory=papers_images_dir), name="papers")

    # 路由
    app.include_router(pages_router)
    app.include_router(admin_router)
    app.include_router(search_router)
    app.include_router(user_router)
    app.include_router(trends_router)
    app.include_router(compare_router)

    return app


app = create_app()


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(
        "app.main:app",
        host=settings.APP_HOST,
        port=settings.APP_PORT,
        reload=settings.APP_DEBUG,
    )