"""SSE-события (realtime) для фронтенда."""
from __future__ import annotations

import asyncio

from fastapi import APIRouter, Depends, Request
from fastapi.responses import StreamingResponse

from ..auth import current_login
from ..sse import broker

router = APIRouter(prefix="/api", tags=["events"])


@router.get("/events")
async def events(request: Request, _: str = Depends(current_login)):
    async def stream():
        q = await broker.subscribe()
        try:
            while True:
                if await request.is_disconnected():
                    break
                try:
                    yield await asyncio.wait_for(q.get(), timeout=15)
                except asyncio.TimeoutError:
                    yield ": ping\n\n"
        finally:
            await broker.unsubscribe(q)

    return StreamingResponse(
        stream(),
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no",
        },
    )