"""chart.amow.com FastAPI backend."""
import asyncio
from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from app.api.meta import router as meta_router
from app.api.routes import router as api_router
from app.api.ws import router as ws_router
from app.config import Settings
from app.runtime import Runtime

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

@asynccontextmanager
async def lifespan(app: FastAPI):
    runtime = Runtime(Settings())
    app.state.runtime = runtime
    task = await runtime.start()
    yield
    runtime.stream.stop()
    task.cancel()
    try:
        await task
    except asyncio.CancelledError:
        pass


app = FastAPI(title="chart", lifespan=lifespan)

app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
app.include_router(meta_router)
app.include_router(api_router)
app.include_router(ws_router)


@app.get("/")
def index():
    return FileResponse(STATIC_DIR / "index.html")