from contextlib import asynccontextmanager
from pathlib import Path
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from lightsync.devices.registry import DeviceRegistry
from lightsync.store.show_store import ShowStore

# Module-level containers populated in lifespan
registry: DeviceRegistry | None = None
show_store: ShowStore | None = None


@asynccontextmanager
async def lifespan(app: FastAPI):
    global registry, show_store
    # Startup
    registry = DeviceRegistry(Path("devices.json"))
    await registry.load()
    show_store = ShowStore(Path("shows"))
    show_store.ensure_dir()
    yield
    # Shutdown
    await registry.save()


def create_app() -> FastAPI:
    app = FastAPI(title="LightSync", lifespan=lifespan)

    # API routes (registered before static mount — see Pattern 7)
    from lightsync.api import shows, devices, ws
    app.include_router(shows.router, prefix="/api/shows")
    app.include_router(devices.router, prefix="/api/devices")
    app.include_router(ws.router)

    # Static file serving — MUST be last (catches all unmatched paths)
    frontend_dir = Path(__file__).parent / "frontend"
    app.mount("/", StaticFiles(directory=frontend_dir, html=True), name="frontend")

    return app


app = create_app()