import { ipcMain, BrowserWindow } from 'electron';

import mqttManager from './mqtt-manager.js';

/**
 * 注册所有 IPC 处理器
 * 将渲染进程的请求转发给 MQTT 管理器，并把 MQTT 事件推送给渲染进程
 */
export function registerIpcHandlers() {

  /**
   * 获取当前所有窗口中的第一个主窗口
   * @returns {BrowserWindow|null} 主窗口实例或 null
   */
  function getMainWindow() {
    const windows = BrowserWindow.getAllWindows();
    return windows.length > 0 ? windows[0] : null;
  }

  /**
   * 向渲染进程发送事件
   * @param {string} channel - IPC 通道名称
   * @param {*} data - 要发送的数据
   */
  function sendToRenderer(channel, data) {
    const win = getMainWindow();
    if (win && !win.isDestroyed()) {
      win.webContents.send(channel, data);
    }
  }

  // 注册 MQTT 管理器的事件监听
  mqttManager.addListener((event, data) => {
    switch (event) {
      case 'status-change':
        sendToRenderer('mqtt:status-change', data);
        break;
      case 'message':
        sendToRenderer('mqtt:message', data);
        break;
      case 'subscription-change':
        sendToRenderer('mqtt:subscription-change', data);
        break;
      case 'subscription-error':
        sendToRenderer('mqtt:subscription-error', data);
        break;
      case 'publish-error':
        sendToRenderer('mqtt:publish-error', data);
        break;
    }
  });

  // ==================== 服务器管理 ====================

  ipcMain.handle('mqtt:get-servers', () => {
    return mqttManager.getServers();
  });

  ipcMain.handle('mqtt:add-server', (_, config) => {
    return mqttManager.addServer(config);
  });

  ipcMain.handle('mqtt:update-server', (_, id, config) => {
    return mqttManager.updateServer(id, config);
  });

  ipcMain.handle('mqtt:delete-server', (_, id) => {
    mqttManager.deleteServer(id);
    return true;
  });

  ipcMain.handle('mqtt:export-servers', () => {
    return mqttManager.exportServers();
  });

  ipcMain.handle('mqtt:import-servers', (_, serverList) => {
    return mqttManager.importServers(serverList);
  });

  // ==================== 连接管理 ====================

  ipcMain.handle('mqtt:connect', (_, id) => {
    return mqttManager.connect(id);
  });

  ipcMain.handle('mqtt:disconnect', (_, id) => {
    mqttManager.disconnect(id);
    return true;
  });

  // ==================== 主题管理 ====================

  ipcMain.handle('mqtt:add-topic', (_, serverId, topic, qos, comment) => {
    return mqttManager.addTopic(serverId, topic, qos, comment);
  });

  ipcMain.handle('mqtt:remove-topic', (_, serverId, topic) => {
    return mqttManager.removeTopic(serverId, topic);
  });

  ipcMain.handle('mqtt:subscribe', (_, serverId, topic) => {
    return mqttManager.subscribe(serverId, topic);
  });

  ipcMain.handle('mqtt:unsubscribe', (_, serverId, topic) => {
    return mqttManager.unsubscribe(serverId, topic);
  });

  ipcMain.handle('mqtt:subscribe-all', (_, serverId) => {
    return mqttManager.subscribeAll(serverId);
  });

  ipcMain.handle('mqtt:update-topic', (_, serverId, topicId, topic, qos, comment) => {
    return mqttManager.updateTopic(serverId, topicId, topic, qos, comment);
  });

  // ==================== 消息发布 ====================

  ipcMain.handle('mqtt:publish', (_, serverId, topic, payload, opts) => {
    return mqttManager.publish(serverId, topic, payload, opts);
  });

  // ==================== 消息管理 ====================

  ipcMain.handle('mqtt:get-messages', (_, serverId) => {
    return mqttManager.getMessages(serverId);
  });

  ipcMain.handle('mqtt:get-publish-history', (_, serverId) => {
    return mqttManager.getPublishHistory(serverId);
  });

  ipcMain.handle('mqtt:clear-messages', (_, serverId) => {
    mqttManager.clearMessages(serverId);
    return true;
  });

  ipcMain.handle('mqtt:clear-publish-history', (_, serverId) => {
    mqttManager.clearPublishHistory(serverId);
    return true;
  });

}