// src/pages/agent-office/hooks/useAgentManager.js
import { useState, useEffect, useRef, useCallback } from 'react';

const WS_RECONNECT_DELAY = 3000;

export function useAgentManager() {
  const [agents, setAgents] = useState({});           // { agentId: { state, detail, task_id } }
  const [pendingTasks, setPendingTasks] = useState([]); // [{id, agent_id, task_type, input_data}]
  const [notifications, setNotifications] = useState({}); // { agentId: count }
  const [connected, setConnected] = useState(false);
  const [refreshTrigger, setRefreshTrigger] = useState(0); // 탭 데이터 리프레시용

  const wsRef = useRef(null);
  const reconnectRef = useRef(null);

  const connect = useCallback(() => {
    const protocol = window.location.protocol === 'https:' ? 'wss' : 'ws';
    const ws = new WebSocket(`${protocol}://${window.location.host}/api/agent-office/ws`);
    wsRef.current = ws;

    ws.onopen = () => setConnected(true);

    ws.onmessage = (e) => {
      const msg = JSON.parse(e.data);

      switch (msg.type) {
        case 'init': {
          // 에이전트 초기 상태 세팅
          const agentMap = {};
          for (const a of msg.agents) {
            agentMap[a.agent_id] = { state: a.state, detail: a.detail || '', task_id: a.task_id };
          }
          setAgents(agentMap);
          setPendingTasks(msg.pending || []);
          break;
        }

        case 'agent_state':
          setAgents(prev => ({
            ...prev,
            [msg.agent]: { state: msg.state, detail: msg.detail || '', task_id: msg.task_id }
          }));
          // idle 전환 시 데이터 리프레시
          if (msg.state === 'idle') {
            setRefreshTrigger(n => n + 1);
          }
          break;

        case 'task_complete':
          setRefreshTrigger(n => n + 1);
          break;

        case 'notification':
          setNotifications(prev => ({
            ...prev,
            [msg.agent]: (prev[msg.agent] || 0) + 1
          }));
          break;

        case 'command_result':
          // 사이드 패널에서 처리
          break;

        default:
          break;
      }
    };

    ws.onclose = () => {
      setConnected(false);
      reconnectRef.current = setTimeout(connect, WS_RECONNECT_DELAY);
    };

    ws.onerror = () => ws.close();
  }, []);

  useEffect(() => {
    connect();
    return () => {
      if (wsRef.current) wsRef.current.close();
      if (reconnectRef.current) clearTimeout(reconnectRef.current);
    };
  }, [connect]);

  const sendCommand = useCallback((agent, action, params = {}) => {
    if (wsRef.current?.readyState === WebSocket.OPEN) {
      wsRef.current.send(JSON.stringify({ type: 'command', agent, action, params }));
    }
  }, []);

  const sendApproval = useCallback((agent, taskId, approved) => {
    if (wsRef.current?.readyState === WebSocket.OPEN) {
      wsRef.current.send(JSON.stringify({ type: 'approval', agent, task_id: taskId, approved }));
    }
  }, []);

  const clearNotifications = useCallback((agentId) => {
    setNotifications(prev => ({ ...prev, [agentId]: 0 }));
  }, []);

  return {
    agents,
    pendingTasks,
    notifications,
    connected,
    refreshTrigger,
    sendCommand,
    sendApproval,
    clearNotifications
  };
}