import json
from datetime import datetime
from typing import List

from fastapi import APIRouter, BackgroundTasks, HTTPException, Query

from models.schemas import Event, EventData, EventResponse, EventsResponse
from services.redis_client import redis_client

router = APIRouter()


@router.post(
    "/publish-event",
    response_model=EventResponse,
    summary="Publish Event",
    description="Publish an event to the Redis message bus",
    responses={
        200: {"description": "Event published successfully"},
        500: {"description": "Failed to publish event"},
    },
    tags=["Events"],
)
async def publish_event(event_data: EventData, background_tasks: BackgroundTasks):
    """Publish an event to the Redis message bus for consumption by other services"""
    try:
        event = {
            "timestamp": datetime.now().isoformat(),
            "service": event_data.service,
            "event_type": event_data.event_type,
            "metadata": json.dumps(event_data.metadata),
        }

        # Publish to Redis
        redis_client.lpush("events", json.dumps(event))

        return EventResponse(status="published", event=event)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get(
    "/events",
    response_model=EventsResponse,
    summary="Get Events",
    description="Retrieve recent events from the message bus",
    responses={
        200: {"description": "Successfully retrieved events"},
        500: {"description": "Failed to retrieve events"},
    },
    tags=["Events"],
)
async def get_events(limit: int = Query(100, ge=1, le=1000, description="Maximum number of events to retrieve")):
    """Get recent events from the Redis message bus"""
    try:
        events: List[str] = redis_client.lrange("events", 0, limit - 1)
        parsed_events = []
        for event in events:
            try:
                event_data = json.loads(event)
                parsed_events.append(Event(**event_data))
            except json.JSONDecodeError:
                continue

        return EventsResponse(events=parsed_events)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))