import { request, redirectToLogin } from '../../utils/request'
import * as auth from '../../utils/auth'
import { PagedResult, NotificationItem } from '../../types/models'
import { STORAGE_KEYS } from '../../utils/config'
import { formatRelativeTime } from '../../utils/format'
import { normalizePaged, mergePaged, hasMorePaged } from '../../utils/paged'
import { getTabBarInstance } from '../../utils/tabbar'

const FILTERS = [
  { name: '全部', value: 0 },
  { name: '点赞', value: 1 },
  { name: '订单', value: 2 },
  { name: '系统', value: 3 },
]

Page({
  data: {
    filters: FILTERS,
    activeFilter: 0,
    list: [] as NotificationItem[],
    loading: true,
    loadingMore: false,
    page: 1,
    pageSize: 20,
    hasMore: true,
  },

  onShow() {
    // 未登录直接回登录页（幂等跳转），不再发出必然 401 的请求
    if (!auth.isLoggedIn()) {
      redirectToLogin()
      return
    }
    this.refresh()
    this.fetchUnread()
  },

  fetchUnread() {
    request<{ unread_count: number }>({
      url: '/notification/unread',
      showError: false,
      silentAuth: true,
    })
      .then((res) => {
        const unread = res.unread_count || 0
        wx.setStorageSync(STORAGE_KEYS.UNREAD, unread)
        // 本页不是 tab 页，getTabBar() 恒为 undefined，需从页面栈里取 tab 页的 tabBar
        const tabBar = getTabBarInstance()
        // 直接更新红点，避免 tabBar 内部再发一次请求
        if (tabBar && tabBar.setUnread) tabBar.setUnread(unread)
      })
      .catch(() => {})
  },

  refresh() {
    this.setData({ page: 1, hasMore: true, loading: this.data.list.length === 0 })
    this.fetchList(1)
  },

  onReachBottom() {
    if (!this.data.hasMore || this.data.loading || this.data.loadingMore) return
    this.fetchList(this.data.page + 1)
  },

  fetchList(page: number) {
    const params: Record<string, any> = { page, page_size: this.data.pageSize }
    const filter = this.data.activeFilter
    if (filter > 0) params.msg_type = filter

    // 请求序号：切换筛选时旧响应可能后到，序号不匹配直接丢弃
    const seq = ((this as any).reqSeq || 0) + 1
    ;(this as any).reqSeq = seq
    if (page > 1) this.setData({ loadingMore: true })

    request<PagedResult<NotificationItem>>({ url: '/notification', data: params })
      .then((res) => {
        if ((this as any).reqSeq !== seq) return
        const { list: raw, total } = normalizePaged<NotificationItem>(res)
        const list = raw.map((it) => ({ ...it, _time: formatRelativeTime(it.created_at) }))
        const merged = mergePaged(this.data.list, list, page === 1)
        this.setData({
          list: merged,
          hasMore: hasMorePaged(merged, total, this.data.pageSize),
          loading: false,
          loadingMore: false,
          page,
        })
      })
      .catch(() => {
        if ((this as any).reqSeq !== seq) return
        this.setData({ loading: false, loadingMore: false })
      })
  },

  onFilterTap(e: WechatMiniprogram.TouchEvent) {
    const index = Number(e.currentTarget.dataset.index)
    if (index === this.data.activeFilter) return
    this.setData({ activeFilter: index, list: [], loading: true })
    this.refresh()
  },

  onItemTap(e: WechatMiniprogram.TouchEvent) {
    const uuid = e.currentTarget.dataset.uuid as string
    wx.navigateTo({ url: `/pages/notification-detail/notification-detail?uuid=${uuid}` })
  },
})