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

from app.api.router import api_router
from app.core.config import settings
from app.core.errors import register_exception_handlers


def create_app() -> FastAPI:
    """应用工厂：创建 FastAPI 实例并挂载中间件、路由和异常处理器。"""
    app = FastAPI(
        title=settings.app_name,
        debug=settings.app_debug,
        version="0.1.0",
        docs_url="/docs",
        redoc_url="/redoc",
    )

    app.add_middleware(
        CORSMiddleware,
        allow_origins=[
            "http://127.0.0.1:5173",
            "http://localhost:5173",
            "http://127.0.0.1:5174",
            "http://localhost:5174",
        ],
        allow_origin_regex=r"^http://(127\.0\.0\.1|localhost|192\.168\.\d+\.\d+):\d+$",
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(api_router, prefix=settings.api_v1_prefix)
    register_exception_handlers(app)
    return app


app = create_app()