import Config from './config.js'
import http from './http.js'
import store from '@/store/index.js'
import lang from './lang.js'

let currentConversationId = null;

// ====== AI Agent Generalization (customer service is the first agent) ======
// setAgentId updates currentAgentId; default is agent_aikefu.
// Any sendMessage / sendStreamMessage / getServiceConfig call passes agent_id automatically.
//
// PR-7: 按 agent_id 路由 endpoint
//   - agent_aikefu (默认智能客服) -> 走 aikefu addon (/api/kefu/* + /ws/aikefu)
//   - 其他 agent (knowledge / quick_reply / sales / hr) -> 走 ai-agent addon (/api/aiagent/* + /ws/aiagent)
//   - 前端不关心后端两个 addon 之间的差异,只关心 agent_id 路由
// 注意: 媒体上传端点按 addon 名注册 (aikefu = /api/aikefu/upload/*), 与普通接口
//       /api/kefu/* 不同名, 该差异由 common/js/media-upload.js 内部的 uploadPath() 处理。

export const DEFAULT_AGENT_ID = 'agent_aikefu';
let currentAgentId = DEFAULT_AGENT_ID;

// PR-MULTI-TURN-KEY-BINDING (2026-09-18): key 格式变更 + 三维隔离
//   老 key: ai_conversation_id_<agentId>           (只按 agent 隔离, 跨用户/跨 uniacid 串会话)
//   新 key: ai_conv_<uniacid>_<userId>_<agentId>   (按 uniacid × userId × agent 三维隔离)
//   一次性迁移: 读老 key → 新 key 为空 → 写入新 key 后保留老 key (1 版本后清理)
export const CONVERSATION_KEY_PREFIX = 'ai_conv_';
const LEGACY_KEY_PREFIX = 'ai_conversation_id_';

export function getConversationKey(agentId) {
  let siteId = 0;
  let userId = 'anon';
  try {
    siteId = uni.getStorageSync('uniacid') || Config.uniacid || 0;
  } catch (e) { /* ignore */ }
  try {
    userId = getUserId() || 'anon';
  } catch (e) { /* ignore */ }
  return CONVERSATION_KEY_PREFIX + siteId + '_' + userId + '_' + (agentId || DEFAULT_AGENT_ID);
}

// 一次性老 key 迁移: 新 key 为空且老 key 有值 → 写入新 key, 保留老 key 1 版本兜底
function migrateLegacyConversationKey(agentId) {
  try {
    const legacyKey = LEGACY_KEY_PREFIX + (agentId || DEFAULT_AGENT_ID);
    const legacy = uni.getStorageSync(legacyKey);
    const newKey = getConversationKey(agentId);
    if (legacy && !uni.getStorageSync(newKey)) {
      uni.setStorageSync(newKey, legacy);
    }
  } catch (e) { /* ignore */ }
}

// 兼容旧代码: 单 key 别名(指向默认 agent) — 给老代码引用,值是动态计算的
export const CONVERSATION_KEY = getConversationKey(DEFAULT_AGENT_ID);

// 统一 SSE/WS 事件分发器 (透出所有事件类型)
let eventHandlers = { onEvent: null };
function dispatchEvent(onEvent, event, data) {
  if (typeof onEvent === 'function') {
    try { onEvent(event, data); }
    catch (e) { console.error('[AI Service] onEvent handler threw:', e); }
  }
}

/**
 * PR-7: agent_id -> 后端 addon 路由映射
 *
 * 规则:
 *   - agent_aikefu (默认智能客服) -> aikefu addon (老路径 /api/kefu/*)
 *   - 其他 agent -> aiagent addon (新路径 /api/aiagent/*)
 *
 * 后端两个 addon 完全独立:
 *   - aikefu: lucky_aikefu_config / conversation / message
 *   - aiagent: lucky_ai_agent_config / conversation / message
 */
function resolveAddonName(agentId) {
  if (!agentId || agentId === 'agent_aikefu') return 'aikefu';
  return 'aiagent';
}

/**
 * PR-7: agent_id -> API endpoint URL
 *   agent_aikefu -> '/api/kefu/...'  (兼容老路径)
 *   其他         -> '/api/aiagent/...'  (ai-agent 新路径)
 */
function resolveApiUrl(apiName) {
  var addon = resolveAddonName(currentAgentId);
  if (addon === 'aikefu') {
    return '/api/kefu/' + apiName;
  }
  return '/api/aiagent/' + apiName;
}

/**
 * PR-7: WebSocket URL 路径(/ws/{addonName})
 */
function resolveWsPath() {
  return '/ws/' + resolveAddonName(currentAgentId);
}

/**
 * 获取域名配置参数（避免重复代码）
 */
function getDomainParams() {
  return {
    imgDomain: Config.imgDomain,
    h5Domain: Config.h5Domain,
    baseUrl: Config.baseUrl
  };
}

// 初始化时从本地读取会话ID(按当前 agent 隔离)
// PR-MULTI-TURN-KEY-BINDING (2026-09-18): 先迁移老 key 再读新 key
// H5 时序坑: 模块顶层同步执行时 uni.getStorageSync 仍返回空字符串
// (uniapp H5 runtime shim 在 webpack bundle 之后才注入),延迟 1 个 tick
// 让 uni runtime 就绪后再读 — 实测 100ms 后能读到值
try {
  setTimeout(() => {
    try {
      migrateLegacyConversationKey(currentAgentId);
      const saved = uni.getStorageSync(getConversationKey(currentAgentId));
      if (saved) {
        currentConversationId = saved;
      }
    } catch (e) {
      console.warn('读取会话ID失败:', e);
    }
  }, 0);
} catch (e) {
  console.warn('初始化会话ID任务派发失败:', e);
}

const GUEST_ID_KEY = 'ai_guest_user_id';

/**
 * 获取用户ID：已登录返回 memberId，未登录生成访客唯一标识并持久化
 */
function getUserId() {
  const memberId = store.state.memberInfo?.id;
  if (memberId) return memberId;

  let guestId;
  try {
    guestId = uni.getStorageSync(GUEST_ID_KEY);
  } catch (e) { /* ignore */ }

  if (!guestId) {
    guestId = 'guest_' + Date.now() + '_' + Math.random().toString(36).slice(2, 10);
    try {
      uni.setStorageSync(GUEST_ID_KEY, guestId);
    } catch (e) { /* ignore */ }
  }
  return guestId;
}

/**
 * 递归在 info 响应中查找配置 uuid (媒体上传必填)。
 * 后端字段名/层级不确定, 深度 4 内匹配 config_uuid / config_uid / uuid 任意字段。
 */
function findConfigUuid(obj, depth) {
  if (!obj || typeof obj !== 'object' || (depth || 0) > 4) return '';
  var keys;
  try { keys = Object.keys(obj); } catch (e) { return ''; }
  for (var i = 0; i < keys.length; i++) {
    var k = keys[i];
    if (/^(config_uuid|config_uid|uuid)$/i.test(k) && obj[k]) return String(obj[k]);
  }
  for (var j = 0; j < keys.length; j++) {
    var v = obj[keys[j]];
    if (v && typeof v === 'object') {
      var found = findConfigUuid(v, (depth || 0) + 1);
      if (found) return found;
    }
  }
  return '';
}

/**
 * 获取当前 AI Agent。
 */
function getAgentId() {
  return currentAgentId || DEFAULT_AGENT_ID;
}

/**
 * 设置当前 AI Agent。
 */
function setAgentId(agentId) {
  if (agentId && typeof agentId === 'string') currentAgentId = agentId;
}

// #ifdef MP
// ================================
// WebSocket 长连接管理（微信小程序）
// ================================
let wsSocketTask = null;
let wsAuthenticated = false;
let wsConnected = false;
let wsConnectionPromise = null;

function getWsDomain() {
  var match = Config.baseUrl.match(/^(?:https?:\/\/|wss?:\/\/)([^\/\s:?#]+(?::\d+)?)/);
  return match ? match[1] : '';
}

function resetWsState() {
  wsSocketTask = null;
  wsAuthenticated = false;
  wsConnected = false;
  wsConnectionPromise = null;
}

/**
 * 确保 WebSocket 已连接并认证，返回一个 Promise
 * 连接建立后保持不断开，后续可复用
 */
function ensureWebSocketConnected() {
  if (wsConnected && wsAuthenticated) {
    return Promise.resolve();
  }
  if (wsConnectionPromise) {
    return wsConnectionPromise;
  }

  wsConnectionPromise = new Promise(function(resolve, reject) {
    var domain = getWsDomain();
    if (!domain) {
      wsConnectionPromise = null;
      reject(new Error(lang.lang('aiService.wsDomainInvalid')));
      return;
    }

    // PR-7: WebSocket 路径按当前 agent_id 路由 — agent_aikefu 走 /ws/aikefu,其他走 /ws/aiagent
    var wsPath = resolveWsPath();
    var wssUrl = 'wss://' + domain + wsPath;
    wsConnected = false;
    wsAuthenticated = false;
    wsSocketTask = wx.connectSocket({ url: wssUrl, header: {} });

    // 获取认证参数（独立函数，不使用 this）
    var _uniacid = uni.getStorageSync('uniacid') || Config.uniacid;
    var _token = store.state.token || 'test_token';
    var _userId = getUserId();

    wsSocketTask.onOpen(function() {
      wsConnected = true;
      wsSocketTask.send({
        data: JSON.stringify({
          action: 'auth',
          agent_id: getAgentId(),
          uniacid: _uniacid,
          token: _token,
          user_id: _userId
        })
      });
    });

    wsSocketTask.onMessage(function(res) {
      try {
        var data = JSON.parse(res.data);

        // Auth 响应
        if (data.type === 'auth_success') {
          wsAuthenticated = true;
          resolve();
          return;
        }
        if (data.type === 'auth_failed') {
          wsAuthenticated = false;
          wsConnectionPromise = null;
          reject(new Error(lang.lang('aiService.wsAuthFailed')));
          return;
        }

        // 以下为聊天消息响应，只在有活跃消息时处理
        if (!wsMessageActive) return;

        // 优先走 onEvent 事件分发(透出 thought/tool_call/question 等)
        var onEvt = eventHandlers.onEvent;

        switch (data.event) {
          case 'message': {
            var text = data.answer || data.content || data.text || '';
            // 兼容嵌套 data.data.content 格式
            if (!text && data.data) {
              text = data.data.content || data.data.answer || '';
            }
            // B 路 Dify 把思考内容混在 answer 里, 以 '> ' 前缀标识
            if (text && text.startsWith('> ')) {
              dispatchEvent(onEvt, 'thought', { content: text, message_id: data.message_id });
              break;
            }
            wsMessageContent += text;
            if (wsMessageOnChunk) wsMessageOnChunk(text);
            dispatchEvent(onEvt, 'message', { content: text, message_id: data.message_id });
            break;
          }
          case 'thought':
          case 'thinking':
          case 'reasoning': {
            // 兼容字段: thought / thinking / reasoning / content / answer
            var thoughtText = data.thought || data.thinking || data.reasoning || data.content || data.answer || '';
            console.log('[AI WS] thought event:', data.event, 'length:', thoughtText.length, 'msgId:', data.message_id);
            dispatchEvent(onEvt, 'thought', { content: thoughtText, message_id: data.message_id });
            break;
          }
          case 'tool_call':
            dispatchEvent(onEvt, 'tool_call', data.tool_call || {});
            break;
          case 'question':
            dispatchEvent(onEvt, 'question', {
              pending_question: data.pending_question || (data.data && data.data.pending_question),
              message_id: data.message_id,
              conversation_id: data.conversation_id
            });
            break;
          case 'message_end':
          case 'done': {
            // 兼容两种结束信号：message_end（流结束）或 done（服务端完成）
            var conversationId = data.conversation_id || (data.data && data.data.conversation_id) || '';
            console.log('[AI WS] 流结束信号, event:', data.event, 'type:', data.type, 'conversationId:', conversationId, '当前内存:', currentConversationId);
            // 保存会话ID（按当前 agent 隔离）
            if (conversationId) {
              if (conversationId !== currentConversationId) {
                currentConversationId = conversationId;
                try {
                  uni.setStorageSync(getConversationKey(currentAgentId), conversationId);
                  console.log('[AI WS] 会话ID已持久化到 storage:', conversationId);
                } catch (e) {
                  console.error('保存会话ID失败:', e);
                }
              }
            }
            var content = wsMessageContent;
            var convId = conversationId;
            // 重置消息状态，但不断开连接
            var endPayload = {
              conversation_id: convId,
              message_id: data.message_id,
              content: data.content || content,
              thoughts: data.thoughts || '',
              tool_calls: data.tool_calls || [],
              tokens: data.tokens || null,
              phase: data.phase || 'completed',
              stop_reason: data.stop_reason || '',
              effective_model: data.effective_model || ''
            };
            wsMessageActive = false;
            wsMessageContent = '';
            dispatchEvent(onEvt, 'message_end', endPayload);
            if (wsMessageOnComplete) wsMessageOnComplete(endPayload);
            if (wsMessageResolve) wsMessageResolve(endPayload);
            break;
          }
          case 'error':
            dispatchEvent(onEvt, 'error', { code: data.code || -1, message: data.message || 'unknown' });
            break;
          case 'ping':
            // keep-alive, 忽略
            break;
          default:
            // 兜底: 老格式 data.data.content
            if (data.data && data.data.content) {
              var defText = data.data.content;
              wsMessageContent += defText;
              if (wsMessageOnChunk) wsMessageOnChunk(defText);
              dispatchEvent(onEvt, 'message', { content: defText });
            } else {
              console.log('[AI WS] 未识别的消息:', JSON.stringify(data).substring(0, 200));
            }
        }
      } catch (e) {
        console.error('WebSocket 消息解析失败:', e, '原始数据:', res.data);
      }
    });

    wsSocketTask.onError(function(err) {
      console.error('WebSocket 连接失败:', err);
      var prevReject = wsMessageReject;
      resetWsState();
      resetWsMessageState();
      if (prevReject) prevReject(new Error(lang.lang('aiService.wsConnectionFailed')));
      reject(new Error(lang.lang('aiService.wsConnectionFailed')));
    });

    wsSocketTask.onClose(function() {
      console.warn('WebSocket 连接已关闭');
      var prevReject = wsMessageReject;
      resetWsState();
      resetWsMessageState();
      if (prevReject) prevReject(new Error(lang.lang('aiService.wsConnectionClosed')));
    });
  });

  return wsConnectionPromise;
}

// 当前消息的回调状态（只支持串行）
var wsMessageResolve = null;
var wsMessageReject = null;
var wsMessageOnChunk = null;
var wsMessageOnComplete = null;
var wsMessageContent = '';
var wsMessageActive = false;

function resetWsMessageState() {
  wsMessageResolve = null;
  wsMessageReject = null;
  wsMessageOnChunk = null;
  wsMessageOnComplete = null;
  wsMessageContent = '';
  wsMessageActive = false;
}

/**
 * 断开 WebSocket 长连接
 */
function disconnectWebSocket() {
  if (wsSocketTask) {
    try { wsSocketTask.close(); } catch (e) { /* ignore */ }
  }
  resetWsState();
  resetWsMessageState();
}
// #endif

// PR-FIX (2026-09-20): getServiceConfig 短 TTL 缓存
//   服务配置(含欢迎语)变更频率极低, 每次进聊天页都打 /api/kefu/info 纯属浪费;
//   TTL 60s + 失败不缓存, 配置保存后最多延迟 1 分钟生效
var _serviceConfigCache = null;
var _serviceConfigCacheAt = 0;
var SERVICE_CONFIG_CACHE_TTL = 60 * 1000;

function resetServiceConfigCache() {
  _serviceConfigCache = null;
  _serviceConfigCacheAt = 0;
}

// PR-CHAT-UI-CONFIG (2026-09-20): chat_ui_config 前端 fallback 默认值
//   与后端 addon/aikefu/model/Config.php::DEFAULT_UI_CONFIG 字段一一对应
//   改任何一项必须同步后端常量, 否则前后端默认分叉
//
//   PR-CHAT-UI-CONFIG-SERVER-ONLY (2026-09-20):
//   ui_available_models 必须完全来自后端 (Config.php::DEFAULT_UI_CONFIG),
//   前端不维护实际清单。仅保留 'Auto' 兜底: 后端 /info 调用失败 / 返回空数组时,
//   模型选择器仍可显示 Auto。
//   数据源 (后端维护): https://docs.openclaw.ai/providers
//   商家可在后台自由增删任意自定义模型名 (自部署/微调), 仅 trim + 去空 + 去重 + 单条 ≤30 字符 + 总数 ≤100。
const CHAT_UI_DEFAULTS = {
  ui_show_thinking_process: true,
  ui_enable_attachment_types: ['image', 'file', 'audio', 'video'],
  ui_input_max_length: 500,
  ui_available_models: ['Auto'],
  ui_enable_feedback: true,
  // PR-CHAT-UI-CONFIG-V2 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
  ui_assistant_name: '',
  // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
  ui_show_assistant_name: true,
  ui_show_assistant_avatar: true,
  ui_assistant_avatar: '',
  ui_show_message_time: true,
  ui_time_format: 'auto',
  ui_time_humanize: false
};

// chat_ui_config 自带短 TTL 缓存(60s, 与 service_config 同步);
// 不在 _serviceConfigCache 里读是因为 chat 组件可能在 getServiceConfig 还没返回前就调它
var _chatUiConfigCache = null;
var _chatUiConfigCacheAt = 0;

function mergeChatUiConfig(remote) {
  // remote 是 /info 响应里的 chat_ui_config 对象, 缺字段用 defaults 兜底
  // 注意: 不深拷贝数组 → 后端返回的就是最终数组, 不再覆盖
  var merged = {};
  Object.keys(CHAT_UI_DEFAULTS).forEach(function(k) {
    if (remote && Object.prototype.hasOwnProperty.call(remote, k) && remote[k] !== null && remote[k] !== undefined) {
      merged[k] = remote[k];
    } else {
      merged[k] = CHAT_UI_DEFAULTS[k];
    }
  });
  return merged;
}

export default {
  /**
   * 获取uniacid
   * @returns {number} uniacid
   */
  getUniacid() {
    return uni.getStorageSync('uniacid') || Config.uniacid; // 从缓存中获取uniacid，或使用默认uniacid
  },

  /**
   * PR-7: 获取当前 agent 对应的 addon 名称 (aikefu / aiagent)
   */
  getAddonName() {
    return resolveAddonName(currentAgentId);
  },

  /**
   * PR-7: 获取当前 agent 对应的 API endpoint 前缀
   */
  getApiPrefix() {
    return resolveAddonName(currentAgentId) === 'aikefu' ? '/api/kefu' : '/api/aiagent';
  },

  /**
   * 发送普通消息（blocking 模式）
   * PR-7: URL 按 agent_id 路由
   */
  async sendMessage(message, options = {}) {
    try {
      const params = {
        url: resolveApiUrl('chat'),
        data: {
          agent_id: getAgentId(),
          user_id: getUserId(),
          stream: false,
          inputs: {},
          query: message,
          response_mode: 'blocking',
          user: getUserId(),
          conversation_id: this.getConversationId() || '',
          attachments: (options && options.attachments) || [],
          // PR-BASIC-CONTEXT-TO-WB (2026-09-28): 透传位置/时间/页面上下文
          //   给 WbAgentOsClient 提供 timestamp/timezone/location/page/metadata 等基础元素
          context: (options && options.context) || null,
          ...getDomainParams()
        },
        header: {
          'Content-Type': 'application/json'
        }
      };

      const response = await http.sendRequest({
        ...params,
        async: false
      });

      const result = this.handleResponse(response);
      if (result.conversationId) {
        this.setConversationId(result.conversationId);
      }
      return result;
    } catch (error) {
      console.error('[AI Service] AiChat API请求失败，详细错误:', error);
      console.error('[AI Service] 错误堆栈:', error.stack);
      console.error('[AI Service] store 状态:', {
        memberInfo: store.state.memberInfo,
        uniacid: this.getUniacid(),
        token: store.state.token
      });
      throw new Error(lang.lang('aiService.serviceUnavailable'));
    }
  },

  /**
   * 流式消息入口（自动适配平台）
   * 微信小程序：复用长连接 WebSocket
   */
  async sendStreamMessage(message, onEvent, onComplete, opts = {}) {
    // #ifdef MP
    try {
      await ensureWebSocketConnected();
    } catch (e) {
      // WebSocket 不可用（真机常见: socket 合法域名未配置 / 后端 WS 未部署）
      // 自动降级为 HTTP 阻塞式请求, 复用与 H5 相同的后端接口
      console.warn('[AI Service] MP WebSocket 不可用，降级为 HTTP blocking 请求:', e && e.message);
      return this._fallbackToHttp(message, onEvent, onComplete, opts);
    }

    wsMessageContent = '';
    wsMessageActive = true;
    eventHandlers.onEvent = (typeof onEvent === 'function') ? onEvent : null;
    // onEvent 模式: 走事件分发; 否则兼容老的 onChunk/onComplete
    wsMessageOnChunk = (typeof onEvent === 'function') ? null : (onEvent || null);
    wsMessageOnComplete = (typeof onEvent === 'function') ? null : (onComplete || null);

    return new Promise((resolve, reject) => {
      wsMessageResolve = resolve;
      wsMessageReject = reject;

      try {
        wsSocketTask.send({
          data: JSON.stringify({
            action: 'chat',
            agent_id: getAgentId(),
            uniacid: this.getUniacid(),
            query: message,
            user_id: getUserId(),
            conversation_id: this.getConversationId() || '',
            attachments: opts.attachments || [],
            // PR-BASIC-CONTEXT-TO-WB (2026-09-28): 透传位置/时间/页面上下文
            context: (opts && opts.context) || null,
            ...getDomainParams()
          })
        });
      } catch (sendErr) {
        console.warn('[AI Service] MP WebSocket send 失败，降级为 HTTP blocking 请求:', sendErr && sendErr.message);
        // 用降级结果决定该 promise 的最终状态, 避免同时弹出错误气泡
        this._fallbackToHttp(message, onEvent, onComplete, opts)
          .then((res) => resolve(res))
          .catch((err) => reject(err));
      }
    });
    // #endif
  },

  /**
   * [MP 降级] WebSocket 不可用时, 改用 HTTP 阻塞式请求完成一次完整回复
   * 只要「request 合法域名」已配置即可工作, 不依赖 socket 合法域名
   */
  async _fallbackToHttp(message, onEvent, onComplete, opts = {}) {
    try {
      const result = await this.sendMessage(message, {
        attachments: (opts && opts.attachments) || [],
        // PR-BASIC-CONTEXT-TO-WB (2026-09-28): MP HTTP 降级路径同步传递 context
        context: (opts && opts.context) || null
      });
      const content = result && result.content ? result.content : '';
      // 阻塞式降级也尝试把后端返回的思考过程/用量透出来, 让小程序在 WS 不可用时仍能显示"思考过程 (N 步)"
      const fallbackPayload = {
        content,
        conversation_id: result.conversationId,
        thoughts: result.thoughts || '',
        tokens: result.tokens || null
      };
      if (content || result.thoughts) {
        if (typeof onEvent === 'function') {
          if (result.thoughts) onEvent('thought', { content: result.thoughts });
          onEvent('message', { content });
          onEvent('message_end', fallbackPayload);
        } else {
          if (onComplete) onComplete(fallbackPayload);
        }
        return fallbackPayload;
      }
      const emptyErr = new Error(lang.lang('aiService.serviceUnavailable'));
      if (onComplete) onComplete({ error: emptyErr.message });
      throw emptyErr;
    } catch (err) {
      console.error('[AI Service] MP HTTP 降级请求也失败:', err);
      if (onComplete) onComplete({ error: (err && err.message) || lang.lang('aiService.serviceUnavailable') });
      throw err;
    }
  },

  /**
   * HTTP 流式请求（仅 H5 使用）
   * PR-7: URL 按 agent_id 路由
   */
  async sendHttpStream(message, onEvent, onComplete, opts = {}) {
    // #ifdef H5
    try {
      var chatUrl = resolveApiUrl('chat');
      // PR-AI-CHAT-URL-NORMALIZE (2026-09-19): Config.baseUrl 文档约定以 '/' 结尾 (config.js:25),
      //   resolveApiUrl 返 '/api/kefu/chat' 也以 '/' 开头 → 直接拼接会出 '//api/kefu/chat' (双斜杠)。
      //   nginx 实际会 normalize, 但 console 会脏、第三方抓包看不懂, 单点 normalize 消除连续 //。
      //   只动 URL 拼接本身, 不改 baseUrl 约定 (整个项目所有 API 都依赖这个约定)。
      var url = (Config.baseUrl + chatUrl).replace(/([^:])\/\//g, '$1/');
      const response = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'text/event-stream',
        },
        body: JSON.stringify({
          uniacid: this.getUniacid(),
          token: store.state.token || 'test_token',
          inputs: {},
          query: message,
          response_mode: 'streaming',
          agent_id: getAgentId(),
          user_id: getUserId(),
          conversation_id: this.getConversationId() || '',
          attachments: (opts && opts.attachments) || [],
          // PR-BASIC-CONTEXT-TO-WB (2026-09-28): 透传位置/时间/页面上下文
          context: (opts && opts.context) || null,
          ...getDomainParams()
        })
      });

      if (!response.ok || !response.body) {
        throw new Error(lang.lang('aiService.invalidResponse'));
      }

      const reader = response.body.getReader();
      const decoder = new TextDecoder('utf-8');
      let buffer = '';
      let content = '';
      let conversationId = '';
      const fire = (evt, payload) => { if (typeof onEvent === 'function') onEvent(evt, payload); };

      while (true) {
        const { done, value } = await reader.read();
        if (done) break;

        buffer += decoder.decode(value, { stream: true });

        const lines = buffer.split('\n');
        buffer = lines.pop() || '';

        for (const line of lines) {
          const trimmed = line.trim();
          if (!trimmed.startsWith('data:')) continue;
          const jsonStr = trimmed.slice(5).trim();
          if (!jsonStr || jsonStr === '[DONE]') continue;
          try {
            const data = JSON.parse(jsonStr);
            // PR-SSE-ERROR-PASSTHROUGH (2026-09-19): blocking 错误响应 (aikefu Kefu.php:558)
            //   或 aiagent Chat.php catch 块会在 stream 模式下也返 {"code":-1,"message":"..."}
            //   这种响应没 event 字段, 不应进 switch 的 default (会污染 console)
            if (data && typeof data === 'object' && !Array.isArray(data) &&
                data.code !== undefined && data.code !== 0 && !data.event) {
              console.warn('[AI SSE] 后端错误响应:', data.code, data.message);
              fire('error', { code: data.code, message: data.message || '请求失败' });
              break;
            }
            // 空数组是 PHP json_encode([]) 的产物 (如 attachments 或 history 字段),
            //   不是事件, 静默跳过
            if (Array.isArray(data)) {
              continue;
            }
            switch (data.event) {
              case 'message': {
                var text = data.answer || data.text || data.content || '';
                if (!text && data.data) text = data.data.content || data.data.answer || '';
                // B 路 Dify 把思考内容混在 answer 里, 以 '> ' 前缀标识
                if (text && text.startsWith('> ')) {
                  fire('thought', { content: text, message_id: data.message_id });
                  break;
                }
                content += text;
                fire('message', { content: text, message_id: data.message_id });
                break;
              }
              case 'thought':
              case 'thinking':
              case 'reasoning': {
                // 兼容字段: thought / thinking / reasoning / content / answer
                var thoughtText2 = data.thought || data.thinking || data.reasoning || data.content || data.answer || '';
                fire('thought', { content: thoughtText2, message_id: data.message_id });
                break;
              }
              case 'tool_call':
                fire('tool_call', data.tool_call || {});
                break;
              case 'question':
                fire('question', {
                  pending_question: data.pending_question || (data.data && data.data.pending_question),
                  message_id: data.message_id,
                  conversation_id: data.conversation_id
                });
                break;
              case 'message_end':
              case 'done': {
                const cid = data.conversation_id || (data.data && data.data.conversation_id) || '';
                if (cid) conversationId = cid;
                console.log('[AI SSE] 收到完成信号:', data.event, 'conversationId:', cid);
                fire('message_end', {
                  conversation_id: cid,
                  message_id: data.message_id,
                  content: data.content || content,
                  thoughts: data.thoughts || '',
                  tool_calls: data.tool_calls || [],
                  tokens: data.tokens || null,
                  phase: data.phase || 'completed',
                  stop_reason: data.stop_reason || '',
                  effective_model: data.effective_model || ''
                });
                break;
              }
              case 'error':
                fire('error', { code: data.code || -1, message: data.message || 'unknown' });
                break;
              default:
                // B 路 Dify 把思考塞 answer 里 (> 前缀)
                if (data.event === 'message' && data.answer && data.answer.startsWith('> ')) {
                  fire('thought', { content: data.answer });
                } else if (data.event === 'ping') {
                  // keep-alive
                } else {
                  console.log('[AI SSE] 未识别事件:', data.event, JSON.stringify(data).substring(0, 200));
                }
            }
          } catch (e) {
            console.warn('解析失败:', e, line);
          }
        }
      }

      console.log('[AI SSE] 流完成, conversationId:', conversationId, 'content长度:', content.length);
      if (onComplete) {
        onComplete({ content, conversation_id: conversationId });
      }
      return { content, conversation_id: conversationId };
    } catch (error) {
      console.error('H5 流式请求失败:', error);
      throw error;
    }
    // #endif
  },

  /**
   * 处理API响应（统一格式）
   */
  handleResponse(response) {
    if (response.code === 0 || response.success) {
      return {
        success: true,
        content: response.data?.answer || response.data?.content || response.data?.reply || response.data,
        conversationId: response.data?.conversation_id,
        messageId: response.data?.message_id,
        thoughts: response.data?.thoughts || '',
        tokens: response.data?.tokens || null
      };
    } else {
      throw new Error(response.message || lang.lang('aiService.serviceResponseError'));
    }
  },

  /**
   * 获取当前会话ID
   */
  getConversationId() {
    return currentConversationId;
  },

  /**
   * 设置并持久化会话ID
   * PR-MULTI-TURN-KEY-BINDING (2026-09-18): 写入前先迁移老 key
   */
  setConversationId(id) {
    if (id && id !== currentConversationId) {
      currentConversationId = id;
      try {
        migrateLegacyConversationKey(currentAgentId);
        uni.setStorageSync(getConversationKey(currentAgentId), id);
      } catch (e) {
        console.error('保存会话ID失败:', e);
      }
    }
  },

  /**
   * PR-MULTI-TURN-KEY-BINDING (2026-09-18): 用户切换钩子
   *   App.vue 在 setMemberInfo 之后调用,触发清旧 user key + 重置 currentConversationId
   *   避免"用户 A 退出 → 用户 B 登录 → 直接复用 A 的会话 ID" 串会话 bug
   *
   *   调用时机:
   *     - App.vue onLaunch 时如果检测到 memberInfo 恢复 → 调一次
   *     - 任何 setMemberInfo 提交后调一次
   *   行为:
   *     - 比对新老 user_id,不同时移除"旧 user"维度的 storage key
   *     - 重置 currentConversationId 为 null (强制下一轮 chat 用新 user 的会话或新建)
   *     - 记录 last_user_id 用于下次对比
   */
  onUserChange() {
    try {
      const newUid = String(getUserId() || 'anon');
      const oldUid = uni.getStorageSync('ai_last_user_id');
      if (oldUid && oldUid !== newUid) {
        // 清旧用户 key 维度 (按当前 agent 即可,下次 setAgentId 会重新计算)
        const oldKey = CONVERSATION_KEY_PREFIX + (uni.getStorageSync('uniacid') || Config.uniacid || 0)
          + '_' + oldUid + '_' + (currentAgentId || DEFAULT_AGENT_ID);
        try { uni.removeStorageSync(oldKey); } catch (e) { /* ignore */ }
      }
      uni.setStorageSync('ai_last_user_id', newUid);
      currentConversationId = null;
    } catch (e) {
      console.warn('[ai-service] onUserChange failed:', e && e.message);
    }
  },

  /**
   * 清除会话ID
   */
  clearConversationId() {
    currentConversationId = null;
    try {
      uni.removeStorageSync(getConversationKey(currentAgentId));
    } catch (e) {
      console.error('清除会话ID失败:', e);
    }
  },

  /**
   * 生成新会话（如需）
   * PR-7: URL 按 agent_id 路由
   */
  async generateConversationId() {
    const params = {
      url: resolveApiUrl('createConversation'),
      data: {
        agent_id: getAgentId(),
        uniacid: this.getUniacid(),
        token: store.state.token || 'test_token',
        user_id: getUserId(),
        member_id: getUserId(),
        ...getDomainParams()
      },
      header: {
        'Content-Type': 'application/json'
      }
    };
    const response = await http.sendRequest({
      ...params,
      async: false
    });
    return this.handleResponse(response);
  },

  /**
   * 获取服务状态
   * PR-7: URL 按 agent_id 路由
   */
  async getServiceStatus() {
    try {
      const response = await http.sendRequest({
        url: resolveApiUrl('health'),
        async: false,
        data: {}
      });
      const available = [response?.data?.status, response?.data?.components?.ai_service_config?.status]
        .filter(item => item === 'healthy').length > 0;
      return {
        available,
        reason: available ? lang.lang('aiService.statusNormal') : lang.lang('aiService.statusAbnormal')
      };
    } catch (error) {
      return {
        available: false,
        reason: lang.lang('aiService.statusCheckFailed')
      };
    }
  },

  /**
   * 获取服务配置信息
   * PR-7: URL 按 agent_id 路由
   */
  async getServiceConfig() {
    // PR-FIX (2026-09-20): 命中缓存直接返回
    const nowTs = Date.now();
    if (_serviceConfigCache && (nowTs - _serviceConfigCacheAt) < SERVICE_CONFIG_CACHE_TTL) {
      console.log('[AI Service] getServiceConfig 命中缓存 (age=' + Math.round((nowTs - _serviceConfigCacheAt) / 1000) + 's)');
      return _serviceConfigCache;
    }
    try {
      const params = {
        url: resolveApiUrl('info'),
        data: {
          agent_id: getAgentId(),
          uniacid: this.getUniacid(),
          token: store.state.token || 'test_token',
          user_id: getUserId(),
          member_id: getUserId(),
          locale: lang.getCurrentLocale()
        },
        header: {
          'Content-Type': 'application/json'
        }
      };
      const response = await http.sendRequest({
        ...params,
        async: false,
      });
      console.log('[AI Service] getServiceConfig response:', JSON.stringify(response));
      // 媒体上传需要 config_uuid (后端校验不能为空)。递归查找并持久化。
      const cfg = response && response.data;
      const uuid = findConfigUuid(cfg, 0);
      if (uuid) {
        uni.setStorageSync('current_config_uuid', uuid);
        console.log('[AI Service] 已缓存 config_uuid:', uuid);
      } else {
        console.warn('[AI Service] info 响应中未找到 config_uuid/config_uid/uuid 字段, 上传将缺少该参数。响应结构:', JSON.stringify(cfg));
      }
      // PR-FIX (2026-09-20): 成功响应写缓存 (失败不缓存, 下次重试)
      _serviceConfigCache = response.data;
      _serviceConfigCacheAt = Date.now();
      return response.data;
    } catch (error) {
      console.error('[AI Service] getServiceConfig error:', error);
      return null;
    }
  },

  /**
   * PR-FIX (2026-09-20): 清除服务配置缓存
   * 供配置变更后主动调用 (目前 60s TTL 已足够, 预留显式失效入口)
   */
  clearServiceConfigCache() {
    resetServiceConfigCache();
    _chatUiConfigCache = null;
    _chatUiConfigCacheAt = 0;
  },

  /**
   * PR-CHAT-UI-CONFIG (2026-09-20): 获取前端 UI 行为开关
   *   5 个 P0 开关由后端 Config::getChatUiConfig() 下发, 字段缺失用前端 CHAT_UI_DEFAULTS 兜底
   *   缓存策略: 60s TTL, 失败不缓存 (下次重试), 与 getServiceConfig 共享 /info 调用
   *   入参: force=true 跳过缓存 (用于用户切换站点/账号后强制刷新)
   */
  async getChatUiConfig(force) {
    const nowTs = Date.now();
    if (!force && _chatUiConfigCache && (nowTs - _chatUiConfigCacheAt) < SERVICE_CONFIG_CACHE_TTL) {
      return _chatUiConfigCache;
    }
    try {
      // 复用 getServiceConfig() 触发 /info; 它的缓存会带回 chat_ui_config 字段
      // 若 service_config 缓存未命中, getServiceConfig() 内部会发请求并填充 _serviceConfigCache
      const serviceData = await this.getServiceConfig();
      const remote = (serviceData && serviceData.chat_ui_config) || null;
      const merged = mergeChatUiConfig(remote);
      _chatUiConfigCache = merged;
      _chatUiConfigCacheAt = Date.now();
      // PR-CHAT-UI-CONFIG-PRELOAD (2026-09-24): 持久化到本地, 供下次进入页面时
      //   getChatUiConfigSync() 同步取用, 实现首帧即用真实配置 (消除默认值闪烁)
      try { uni.setStorageSync('AI_CHAT_UI_CONFIG', merged); } catch (e) { /* 存储失败不影响主流程 */ }
      return merged;
    } catch (e) {
      console.warn('[AI Service] getChatUiConfig 失败, 使用前端默认值:', (e && e.message) || e);
      // 失败也要返回可用配置 (前端默认), 但不写缓存 — 下次重试
      return Object.assign({}, CHAT_UI_DEFAULTS);
    }
  },

  /**
   * PR-CHAT-UI-CONFIG-PRELOAD (2026-09-24): 同步获取聊天 UI 配置 (本地持久缓存)
   *   场景: 页面 onLoad 首帧渲染前调用, 上次会话成功拉取过的配置直接可用,
   *   避免"先按默认值渲染 → 异步配置到达后跳变"的闪烁。
   *   返回: 配置对象 (缓存命中, 已 merge 兜底) 或 null (从未成功拉取过)
   *   注意: 只读缓存不发起网络请求; 最新值仍由 getChatUiConfig() 异步刷新
   */
  getChatUiConfigSync() {
    try {
      const cached = uni.getStorageSync('AI_CHAT_UI_CONFIG');
      if (cached && typeof cached === 'object' && Object.keys(cached).length) {
        return mergeChatUiConfig(cached);
      }
    } catch (e) { /* 存储读取失败按无缓存处理 */ }
    return null;
  },

  /**
   * 清除会话历史（调用后端接口）
   * PR-7: URL 按 agent_id 路由
   */
  async clearConversation(conversationId) {
    try {
      // PR-AI-CLEAR-CONV-FIX (2026-09-19): URL 必须用 camelCase
      //   ThinkPHP 后端方法名 = clearConversation, URL 不做 kebab→camel 转换
      //   之前 'clear-conversation' 拼出 /api/kefu/clear-conversation → 404 method not exists
      //   改 'clearConversation' → /api/kefu/clearConversation → 200
      const response = await http.sendRequest({
        url: resolveApiUrl('clearConversation'),
        data: {
          agent_id: getAgentId(),
          conversation_id: conversationId,
          ...getDomainParams()
        },
        async: false
      });
      return response.success;
    } catch (error) {
      console.error('清除会话失败:', error);
      return false;
    }
  },

  /**
   * 向 WorkBuddy Agent 回传 AskUserQuestion 的用户选项
   * @param {Object} params { conversation_id, message_id, tool_call_id, rpc_id, answers }
   * @returns {Promise<boolean>}
   */
  async elicitResponse({ conversation_id, message_id, tool_call_id, rpc_id, answers }) {
    // #ifdef MP-WEIXIN || APP-PLUS || MP-HARMONY
    try {
      await ensureWebSocketConnected();
    } catch (e) {
      console.warn('[ai-service] elicitResponse WS 不可用:', e && e.message);
      return false;
    }
    wsSocketTask.send({
      data: JSON.stringify({
        action: 'elicit_response',
        conversation_id,
        message_id,
        tool_call_id,
        rpc_id,
        answers,
        uniacid: this.getUniacid(),
        token: store.state.token || 'test_token'
      })
    });
    return true;
    // #endif
    // #ifdef H5
    // PR-ELICIT-RESPONSE-HTTP (2026-09-18, 修 2026-09-19): H5 端改 fetch POST 新端点
    //   后端 InitRoute 注册的是 addon 模式 URL /{addon}/api/chat/elicit-response
    //   (aikefu/api/... 或 aiagent/api/...),不能用 resolveApiUrl 因为它走 /api/{short}/...
    //   会拆出 module=api, controller=kefu/aiagent, action=chat → 命中 chat() 而非 elicitResponse()
    //   (PR-WB-MP-MEDIA 注释里记录的同款 thinkphp 路由陷阱)
    //   必须用 resolveAddonName() 拿 addon 全名直接拼 URL
    try {
      const addon = resolveAddonName(currentAgentId);  // aikefu / aiagent
      const url = Config.baseUrl + '/' + addon + '/api/chat/elicit-response';
      const resp = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Token': store.state.token || 'test_token'
        },
        body: JSON.stringify({
          conversation_id,
          message_id,
          tool_call_id,
          rpc_id,
          answers,
          uniacid: this.getUniacid(),
          user_id: getUserId(),
          token: store.state.token || 'test_token'
        })
      });
      const data = await resp.json();
      return !!(data && (data.code === 0 || data.success));
    } catch (e) {
      console.warn('[ai-service] H5 elicitResponse HTTP failed:', e && e.message);
      return false;
    }
    // #endif
  },

  /**
   * 获取会话历史
   * PR-7: URL 按 agent_id 路由
   */
  async getConversationHistory(params = {}) {
    try {
      if (!params.conversation_id) {
        throw new Error(lang.lang('aiService.conversationIdRequired'));
      }
      console.log('[AI History] 请求历史, conversation_id:', params.conversation_id, 'limit:', params.limit);
      const requestData = {
        agent_id: params.agent_id || getAgentId(),
        uniacid: params.uniacid || this.getUniacid(),
        conversation_id: params.conversation_id,
        user_id: params.user_id || getUserId(),
        limit: params.limit || 20,
        offset: params.offset || 0,
        member_id: params.member_id || getUserId(),
        token: params.token || '',
        ...getDomainParams()
      };
      const response = await http.sendRequest({
        url: resolveApiUrl('getHistory'),
        data: requestData,
        header: {
          'Content-Type': 'application/json'
        },
        async: false
      });
      if (response.code === 0 || response.success) {
        return {
          success: true,
          data: response.data,
          messages: response.data?.messages || [],
          total: response.data?.total || 0,
          page_info: response.data?.page_info || { limit: 20, offset: 0 }
        };
      } else {
        throw new Error(response.message || lang.lang('aiService.getHistoryFailed'));
      }
    } catch (error) {
      console.error('获取会话历史失败:', error);
      throw new Error(error.message || lang.lang('aiService.getHistoryError'));
    }
  },

  // ================================
  // 以下方法仅用于 H5，小程序无效
  // ================================

  /**
   * [H5 Only] EventSource 流式聊天（备用）
   * PR-7: URL 按 agent_id 路由
   */
  chatWithEventSource(message, conversationId = '', onMessage, onComplete, onError) {
    // #ifdef H5
    if (window.currentEventSource) {
      window.currentEventSource.close();
    }
    const paramsObj = {
      agent_id: getAgentId(),
      uniacid: this.getUniacid(),
      user_id: getUserId(),
      member_id: getUserId(),
      token: store.state.token || 'test_token',
      query: message,
      conversation_id: conversationId || '',
      stream: 'true',
      ...getDomainParams()
    };
    const params = new URLSearchParams(paramsObj);
    var chatUrl = resolveApiUrl('chat');
    const url = `${Config.baseUrl}${chatUrl}?${params.toString()}`;
    try {
      const eventSource = new EventSource(url);
      window.currentEventSource = eventSource;
      let aiMessage = '';
      eventSource.onmessage = (event) => {
        try {
          const data = JSON.parse(event.data);
          if (data.event === 'message') {
            aiMessage += data.answer || '';
            if (onMessage) onMessage(data.answer || '');
          }
          if (data.event === 'message_end') {
            if (onComplete) onComplete({
              conversation_id: data.conversation_id,
              message: aiMessage
            });
          }
        } catch (error) {
          console.error('解析消息失败:', error);
        }
      };
      eventSource.onerror = (error) => {
        console.error('EventSource错误:', error);
        if (onError) onError({ error: lang.lang('aiService.connectionFailed') });
        window.currentEventSource = null;
      };
      return eventSource;
    } catch (error) {
      console.error('创建EventSource失败:', error);
      if (onError) onError({ error: error.message });
      return null;
    }
    // #endif
    // #ifdef MP
    console.warn('chatWithEventSource 不支持微信小程序');
    return null;
    // #endif
  },

  /**
   * [H5 Only] Fetch 流式聊天（备用）
   */
  async chatWithFetchStream(message, conversationId = '', onMessage, onComplete, onError) {
    // #ifdef H5
    return this.sendHttpStream(message, onMessage, (res) => {
      onComplete?.({ message: res.content, conversation_id: res.conversation_id });
    });
    // #endif
    // #ifdef MP
    console.warn('chatWithFetchStream 不支持微信小程序');
    return null;
    // #endif
  },

  // #ifdef MP
  /**
   * [微信小程序] 断开 WebSocket 长连接（页面离开时调用）
   */
  disconnectWebSocket() {
    disconnectWebSocket();
  },
  // #endif
  // #ifdef H5
  disconnectWebSocket() {
    // H5 无 WebSocket 长连接，无需操作
  },
  // #endif

  /**
   * Set current AI Agent (default aikefu; link system passes agent_id).
   * PR-7: 切换 agent 时, 如果跨 addon 则断开 WebSocket 重连 (路径变了)
   *
   * PR-AGENT-LIFECYCLE-CLEANUP (2026-09-19): agent 真的"变了"(从 A → B) 时
   *   主动清当前会话 ID 缓存, 不展示陈旧会话 → "无痛苦无疑惑"
   *   - 后端 L2 会兜底: 老 agent 被删 → 静默开新会话 (前端什么都不用做也对)
   *   - 但前端主动清更安全: 即便后端没回 404, 用户也不看到"我换 agent 了为什么还是上次的对话"
   *
   * @param {string} agentId
   * @param {object} opts { silent: bool } true = 不回调, 默认 false
   */
  setAgentId(agentId, opts) {
    var oldAgentId = currentAgentId;
    var oldAddon = resolveAddonName(currentAgentId);
    setAgentId(agentId);
    var newAddon = resolveAddonName(currentAgentId);
    if (oldAddon !== newAddon) {
      try { disconnectWebSocket(); } catch (e) { /* ignore */ }
    }
    // PR-AGENT-LIFECYCLE-CLEANUP: agent 字符串真变化 (A → B) → 清 conv_id 缓存
    //   不变化 (aikefu → aikefu 同 string) → 保留缓存, 让用户继续之前的多轮对话
    var agentChanged = oldAgentId && oldAgentId !== agentId;
    currentConversationId = null;
    try {
      const saved = uni.getStorageSync(getConversationKey(currentAgentId));
      if (saved && !agentChanged) currentConversationId = saved;
      else if (saved && agentChanged) {
        // agent 变了, 把老 agent 的 conv_id 也清掉, 避免老 user 换个 product page 又用回
        try {
          const oldKey = getConversationKey(oldAgentId);
          if (oldKey) uni.removeStorageSync(oldKey);
        } catch (e) {}
      }
    } catch (e) { /* ignore */ }
  },

  /**
   * 获取当前 agent 的会话存储 key (per-agent 隔离)
   */
  getConversationKey(agentId) {
    return getConversationKey(agentId);
  },

  /**
   * 获取全部 agent 的会话 ID 映射 (用于会话列表, 可选)
   */
  getAllConversations() {
    const out = {};
    try {
      const info = uni.getStorageInfoSync();
      (info.keys || []).filter(k => k.indexOf(CONVERSATION_KEY_PREFIX) === 0)
        .forEach(k => { out[k.substring(CONVERSATION_KEY_PREFIX.length)] = uni.getStorageSync(k); });
    } catch (e) { /* ignore */ }
    return out;
  },

  /**
   * 获取当前 config_uuid (媒体上传路由用)
   * 优先级: info 接口缓存 > 本地配置 (.local.config.js aikefuConfigUuid)
   */
  getCurrentConfigUuid() {
    return uni.getStorageSync('current_config_uuid') || Config.aikefuConfigUuid || '';
  },

  /**
   * 获取用户 ID (媒体上传字段用)
   */
  getUserId() {
    return getUserId();
  },

  /**
   * Get current AI Agent.
   * @returns {string}
   */
  getAgentId() {
    return getAgentId();
  },
};