#  Copyright 2026 zhaoxi826
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
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from pretor.utils.ray_hook import ray_actor_hook
from fastapi import APIRouter, Request
from fastapi.responses import StreamingResponse
import asyncio

workflow_router = APIRouter(prefix="/api/v1/workflow", tags=["workflow"])

@workflow_router.get("/list")
async def get_workflow_list():
    global_state_machine = ray_actor_hook("global_state_machine").global_state_machine
    events = await global_state_machine.list_events.remote()
    return events

@workflow_router.get("/sse/{trace_id}")
async def get_workflow_sse(trace_id: str, request: Request):
    global_state_machine = ray_actor_hook("global_state_machine").global_state_machine

    async def event_generator():
        try:
            while True:
                if await request.is_disconnected():
                    break

                # You might also want to send the workflow state periodically or when updated
                # Here we just wait for pending messages and send them
                message = await global_state_machine.get_pending.remote(trace_id)
                # Ensure the message is formatted as SSE
                yield f"data: {message}\n\n"
        except asyncio.CancelledError:
            pass

    return StreamingResponse(event_generator(), media_type="text/event-stream")

@workflow_router.post("/reply/{trace_id}")
async def post_workflow_reply(trace_id: str, request: Request):
    data = await request.json()
    reply_msg = data.get("message", "")
    global_state_machine = ray_actor_hook("global_state_machine").global_state_machine
    await global_state_machine.put_received.remote(trace_id, reply_msg)
    return {"status": "ok"}