"""
app/api/routes_status.py
HTTP endpoints for server/agent status and SSE events.
"""

from __future__ import annotations

import logging
from datetime import datetime, timezone

from fastapi import APIRouter
from fastapi.responses import StreamingResponse

from app.config import APP_VERSION
from app.models import (
    AgentInfo,
    HealthResponse,
    QueueCounts,
    ServerInfo,
    StatusResponse,
)
from app.services import config_service, event_service, instruction_service, status_service

logger = logging.getLogger(__name__)

router = APIRouter(tags=["status"])


@router.get("/healthz", response_model=HealthResponse)
def health():
    return HealthResponse(status="ok", server_time=datetime.now(timezone.utc))


@router.get("/api/status", response_model=StatusResponse)
def get_status():
    agent_row = status_service.get_latest_agent_activity()
    connected = status_service.is_agent_connected()

    agent_info = AgentInfo(
        connected=connected,
        last_seen_at=datetime.fromisoformat(agent_row["last_seen_at"]) if agent_row else None,
        last_fetch_at=datetime.fromisoformat(agent_row["last_fetch_at"]) if agent_row else None,
        agent_id=agent_row["agent_id"] if agent_row else None,
    )

    counts = instruction_service.get_queue_counts()
    cfg = config_service.get_config()

    return StatusResponse(
        server=ServerInfo(
            status="up",
            started_at=status_service.server_started_at(),
            version=APP_VERSION,
            type="python",
        ),
        agent=agent_info,
        queue=QueueCounts(**counts),
        settings=cfg,
    )


@router.get("/api/events")
async def sse_events():
    q = event_service.subscribe()

    async def stream():
        async for chunk in event_service.event_generator(q):
            yield chunk

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