Component({
  data: {
    selected: 0,
    unreadCount: 0,
    tabs: [
      { pagePath: '/pages/feed/feed' },
      { pagePath: '/pages/nearby/nearby' },
      { pagePath: '/pages/friends/friends' },
      { pagePath: '/pages/profile/profile' },
    ],
  },

  methods: {
    onTab(e: WechatMiniprogram.CustomEvent) {
      // dataset 取出的是字符串，必须转数字，否则 WXML 中 selected === n 严格比较失败
      const index = Number(e.currentTarget.dataset.index)
      const path = e.currentTarget.dataset.path as string
      if (index === this.data.selected) return
      this.setData({ selected: index })
      wx.switchTab({ url: path })
    },

    onPost() {
      wx.navigateTo({ url: '/pages/post/post' })
    },

    setSelected(index: number) {
      this.setData({ selected: index })
    },

    setUnread(count: number) {
      this.setData({ unreadCount: count })
    },
  },
})