"""FastAPI 应用工厂。"""

from __future__ import annotations

import sys
from contextlib import asynccontextmanager
from pathlib import Path

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

from fastapi_admin.config import APP_NAME, APP_CORS_ORIGINS
from fastapi_admin.config._loader import _find_project_root

# 确保项目根在 sys.path
_PROJECT_ROOT = _find_project_root()
if str(_PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(_PROJECT_ROOT))

# fastapi_modules 目录加入路径（使 importlib 能找到各模块）
_FASTMOD = _PROJECT_ROOT / "fastapi_modules"
_FASTMOD_LEAUDIT = _FASTMOD / "fastapi_leaudit"
_NATIVE_LEAUDIT_SRC = _PROJECT_ROOT.parent / "leaudit" / "src"
if str(_FASTMOD) not in sys.path:
    sys.path.insert(0, str(_FASTMOD))
if str(_FASTMOD_LEAUDIT) not in sys.path:
    sys.path.insert(0, str(_FASTMOD_LEAUDIT))
if _NATIVE_LEAUDIT_SRC.exists() and str(_NATIVE_LEAUDIT_SRC) not in sys.path:
    sys.path.insert(0, str(_NATIVE_LEAUDIT_SRC))


def create_app() -> FastAPI:
    """创建并配置 FastAPI 应用。"""

    @asynccontextmanager
    async def lifespan(app: FastAPI):
        import logging
        logging.basicConfig(level=logging.INFO)
        logging.getLogger("APP").info(f"{APP_NAME} starting...")
        yield
        logging.getLogger("APP").info(f"{APP_NAME} shutting down...")

    app = FastAPI(
        title=APP_NAME,
        version="1.0.0",
        lifespan=lifespan,
        docs_url="/api/docs",
        redoc_url=None,
    )

    # CORS
    origins = [o.strip() for o in APP_CORS_ORIGINS.split(",") if o.strip()]
    app.add_middleware(
        CORSMiddleware,
        allow_origins=origins,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    # 注册控制器
    from fastapi_admin.bootstrap_parts.controllers import register_controllers
    register_controllers(app)

    return app


app = create_app()