from __future__ import annotations

from contextlib import asynccontextmanager
from typing import Iterator

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

from fan_passport.config import Settings, get_settings
from fan_passport.database import configure_database, init_db
from fan_passport.errors import register_error_handlers
from fan_passport.api.routes import router


def create_app(settings: Settings | None = None) -> FastAPI:
    active_settings = settings or get_settings()
    configure_database(active_settings.database_url)

    @asynccontextmanager
    async def lifespan(_: FastAPI) -> Iterator[None]:
        if active_settings.auto_create_tables:
            init_db()
        yield

    app = FastAPI(
        title=active_settings.app_name,
        version="0.1.0",
        description="Backend MVP and gamification engine for Fan Passport.",
        lifespan=lifespan,
    )
    app.state.settings = active_settings

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

    register_error_handlers(app)
    app.include_router(router)
    return app


app = create_app()


def run() -> None:
    uvicorn.run("fan_passport.main:app", host="0.0.0.0", port=8000, reload=False)