/**
 * 消息列表页 U23
 *
 * 不变量（AGENTS.md）：
 *   - 第 3 条：Mutual Match 后才能聊天
 *   - 第 4 条：Block/Unmatch 后会话立即停用
 *   - 第 6 条：单向活动意向不泄露
 *   - 第 9 条：DB 是 Source of Truth
 */
import { messageStore, appStore, authStore } from '../../stores';
import { ROUTE, to } from '../../constants';

Page({
  data: {
    conversations: [] as any[],
    loading: false,
    unreadTotal: 0,
    emptyActions: [{ text: '去今日推荐', event: 'home', variant: 'primary' }],
  },

  onLoad() {
    (this as any)._unsubMsg = messageStore.bindToPage(this, {
      conversations: 'conversations',
      totalUnreadCount: 'unreadTotal',
    });
    (this as any)._unsubLoading = messageStore.subscribe((state: any) => {
      if (state.conversationsLoading !== this.data.loading) {
        this.setData({ loading: state.conversationsLoading });
      }
    });
    this.setData({ loading: messageStore.state.conversationsLoading });
  },

  onShow() {
    if (!authStore.state.isLoggedIn) return;
    messageStore.fetchConversations().catch((err: any) => appStore.toastError(err));
  },

  onUnload() {
    if ((this as any)._unsubMsg) (this as any)._unsubMsg();
    if ((this as any)._unsubLoading) (this as any)._unsubLoading();
  },

  onPullDownRefresh() {
    messageStore.fetchConversations().finally(() => wx.stopPullDownRefresh());
  },

  onReachBottom() {
    if (messageStore.state.conversationsHasMore) {
      messageStore.loadMoreConversations().catch(() => {});
    }
  },

  onGoChat(e: any) {
    const { conversationId, canSendMessage } = e.detail;
    if (!canSendMessage) {
      appStore.toastError('当前会话已停用，无法继续聊天');
      return;
    }
    wx.navigateTo({ url: to.chat(conversationId) });
  },

  onShortcutTap(e: any) {
    const key = e.currentTarget.dataset.key;
    if (key === 'new-friends') { wx.switchTab({ url: ROUTE.TAB.DISCOVER }); return; }
    if (key === 'system') { wx.navigateTo({ url: ROUTE.SETTINGS.NOTIFICATIONS }); return; }
    wx.navigateTo({ url: ROUTE.MAIN.FATE_CENTER });
  },

  onEmptyAction(e: any) {
    if (e.detail.event === 'home') wx.switchTab({ url: ROUTE.TAB.HOME });
  },
});