#  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,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.


from pretor.utils.ray_hook import ray_actor_hook
from fastapi import APIRouter, Request, HTTPException
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("/{trace_id}")
async def get_workflow_detail(trace_id: str):
    global_state_machine = ray_actor_hook("global_state_machine").global_state_machine
    event = await global_state_machine.get_event.remote(trace_id)
    if not event:
        raise HTTPException(status_code=404, detail="Workflow not found")

    workflow = event.workflow
    if not workflow:
        return {
            "event_id": trace_id,
            "workflow_title": None,
            "status": "waiting",
            "user_name": event.user_name,
            "message": event.message,
            "create_time": event.create_time,
            "steps": [],
        }

    steps = []
    for step in workflow.work_link:
        steps.append({
            "step": step.step,
            "name": step.name,
            "node": step.node,
            "action": step.action,
            "desc": step.desc,
            "status": step.status,
            "agent_id": step.agent_id,
        })
    return {
        "event_id": trace_id,
        "workflow_title": workflow.title,
        "status": workflow.status.status,
        "command": workflow.command,
        "current_step": workflow.status.step,
        "user_name": event.user_name,
        "message": event.message,
        "create_time": event.create_time,
        "steps": steps,
    }

@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"}