from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import RedirectResponse
from fastapi.staticfiles import StaticFiles

from app.api.router import api_router
from app.core.config import settings
from app.core.database import init_db
from app.deps import NotAuthenticated
from app.web.admin import router as admin_router
from app.web.pages import router as pages_router

STATIC_DIR = Path(__file__).resolve().parent / "static"


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Dev/SQLite convenience. Use Alembic migrations in production.
    if settings.auto_create_tables:
        await init_db()
    yield


def create_app() -> FastAPI:
    app = FastAPI(title=settings.app_name, debug=settings.debug, lifespan=lifespan)

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

    app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")

    app.include_router(api_router, prefix="/api")
    app.include_router(pages_router)
    app.include_router(admin_router)

    @app.exception_handler(NotAuthenticated)
    async def _redirect_to_login(request: Request, exc: NotAuthenticated):
        return RedirectResponse(url="/login", status_code=302)

    @app.get("/healthz", tags=["health"])
    async def healthz():
        return {"status": "ok"}

    return app


app = create_app()