"""FastAPI app factory for CartSnitch API Gateway."""

from contextlib import asynccontextmanager

from fastapi import APIRouter, FastAPI

from cartsnitch_api.auth.routes import router as auth_router
from cartsnitch_api.cache import cache_client
from cartsnitch_api.middleware.audit import add_audit_middleware
from cartsnitch_api.middleware.cors import add_cors_middleware
from cartsnitch_api.middleware.error_handler import add_error_handlers, add_error_monitor_middleware
from cartsnitch_api.middleware.rate_limit import add_rate_limit_middleware
from cartsnitch_api.routes.alerts import router as alerts_router
from cartsnitch_api.routes.coupons import router as coupons_router
from cartsnitch_api.routes.health import router as health_router
from cartsnitch_api.routes.prices import router as prices_router
from cartsnitch_api.routes.products import router as products_router
from cartsnitch_api.routes.public import router as public_router
from cartsnitch_api.routes.purchases import router as purchases_router
from cartsnitch_api.routes.scraping import router as scraping_router
from cartsnitch_api.routes.shopping import router as shopping_router
from cartsnitch_api.routes.stores import router as stores_router
from cartsnitch_api.routes.user import router as user_router


@asynccontextmanager
async def lifespan(app: FastAPI):
    from cartsnitch_api.database import dispose_engine

    await cache_client.initialize()
    yield
    await cache_client.close()
    await dispose_engine()


def create_app() -> FastAPI:
    app = FastAPI(
        title="CartSnitch API",
        description="Grocery price tracking and shrinkflation detection API",
        version="0.1.0",
        lifespan=lifespan,
    )

    # Middleware (order matters — outermost first)
    add_cors_middleware(app)
    add_error_monitor_middleware(app)
    add_rate_limit_middleware(app)
    add_audit_middleware(app)

    # Exception handlers
    add_error_handlers(app)

    # Routers
    app.include_router(health_router)
    app.include_router(auth_router)

    # Data endpoints mounted under /api/v1
    v1_router = APIRouter(prefix="/api/v1")
    v1_router.include_router(user_router)
    v1_router.include_router(stores_router)
    v1_router.include_router(purchases_router)
    v1_router.include_router(products_router)
    v1_router.include_router(prices_router)
    v1_router.include_router(coupons_router)
    v1_router.include_router(shopping_router)
    v1_router.include_router(alerts_router)
    v1_router.include_router(scraping_router)
    v1_router.include_router(public_router)
    app.include_router(v1_router)

    return app


app = create_app()