import { request } from '../../utils/request'
import { PagedResult, OutfitItem } from '../../types/models'
import { OutfitSource } from '../../utils/config'
import { normalizePaged, mergePaged, hasMorePaged } from '../../utils/paged'
import { CoverCell, outfitCover } from '../../utils/outfit-cover'
import { OUTFIT_STATUS, OutfitStatusPill, isPendingSave, outfitStatusPill } from '../../utils/outfit-status'
import { navScroll } from '../../utils/nav'
import { logger } from '../../utils/logger'

// 日志模块名
const LOG = 'ai-pending'

// 列表行：AI 生成结果 + 预计算的封面与状态胶囊（WXML 不能调用方法）
type AiRow = OutfitItem & {
  _status: OutfitStatusPill
  _covers: CoverCell[]
  _collageCls: string
  _moreCount: number
}

Page({
  data: {
    // 0 待保存（status=3） / 1 已保存（status=1）
    activeTab: 0,
    pendingList: [] as AiRow[],
    savedList: [] as AiRow[],
    // 当前分段渲染的数据（切段时同步切换，避免模板里写两套列表）
    list: [] as AiRow[],
    loading: true,
    refreshing: false,
    loadingMore: false,
    page: 1,
    pageSize: 20,
    hasMore: true,
    // 保存/删除防抖：同一时刻只允许一个写操作
    saving: false,
    // 正在保存的那一条：按钮显示「保存中…」，避免重复点击
    busyUuid: '',
    // 滚动收缩：由 utils/nav.ts 的共享 handler 驱动
    navScrolled: false,
    // 删除确认（v2 玻璃弹窗）
    delVisible: false,
    delText: '',
    delUuid: '',
    delButtons: [
      { text: '取消', value: '' },
      { text: '确认删除', value: 'ok', type: 'main' },
    ],
    // 轻量反馈（v2 深色玻璃 toast）
    toastVisible: false,
    toastText: '',
  },

  // scroll-view 滚动 → 导航收缩为玻璃小标题
  onNavScroll: navScroll,

  // 操作行空白处吞掉点击，避免穿透到卡片进详情
  noop() {},

  onLoad() {
    // 首帧渲染后再发请求，避免 setData 早于首次渲染导致 webview 渲染失败
    wx.nextTick(() => this.fetchList(1))
  },

  onShow() {
    // 从详情页返回（可能在详情页保存过）需要重取，保证分段与状态一致
    if ((this as any).loaded) this.fetchList(1)
    ;(this as any).loaded = true
  },

  onTabChange(e: WechatMiniprogram.TouchEvent) {
    const index = Number(e.currentTarget.dataset.index)
    if (index === this.data.activeTab) return
    logger.debug(LOG, '切换分段, index=', index)
    this.setData({ activeTab: index, list: index === 0 ? this.data.pendingList : this.data.savedList })
  },

  onRefresh() {
    this.setData({ refreshing: true })
    this.fetchList(1).finally(() => this.setData({ refreshing: false }))
  },

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

  // 拉取 AI 穿搭：后端 GET /outfit 只支持 source 过滤（没有 status），
  // 因此一次拉全量再本地按 status 拆成「待保存 / 已保存」两段，分页仍按原始数据推进
  fetchList(page: number): Promise<void> {
    const seq = ((this as any).reqSeq || 0) + 1
    ;(this as any).reqSeq = seq
    if (page > 1) {
      this.setData({ loadingMore: true })
    } else {
      this.setData({ loading: this.data.pendingList.length === 0 && this.data.savedList.length === 0 })
    }

    return request<PagedResult<OutfitItem>>({
      url: '/outfit',
      data: { page, page_size: this.data.pageSize, source: OutfitSource.AI },
    })
      .then((res) => {
        if ((this as any).reqSeq !== seq) return
        const { list: raw, total } = normalizePaged<OutfitItem>(res)
        const rows: AiRow[] = raw.map((it) => ({
          ...it,
          ...outfitCover(it.items),
          _status: outfitStatusPill(it),
        }))
        // 累积数组放实例而非 data：避免每次 setData 传输全量原始数据
        const all = mergePaged<AiRow>(((this as any).allRows || []) as AiRow[], rows, page === 1)
        ;(this as any).allRows = all
        logger.debug(LOG, 'AI 穿搭加载成功, page=', page, '条数=', rows.length, '累计=', all.length)
        this.setData({
          hasMore: hasMorePaged(all, total, this.data.pageSize),
          loading: false,
          loadingMore: false,
          page,
        })
        this.applySplit(all)
      })
      .catch((e: any) => {
        if ((this as any).reqSeq !== seq) return
        logger.warn(LOG, 'AI 穿搭加载失败, page=', page, 'code=', e && e.code)
        this.setData({ loading: false, loadingMore: false })
      })
  },

  // 按 status 拆段并同步当前分段渲染数据
  applySplit(all: AiRow[]) {
    const pendingList = all.filter((it) => isPendingSave(it))
    const savedList = all.filter((it) => !isPendingSave(it))
    this.setData({
      pendingList,
      savedList,
      list: this.data.activeTab === 0 ? pendingList : savedList,
    })
  },

  // 保存为正式穿搭（status 3 → 1）：成功后本地迁移段落，不重新请求以免闪屏
  onSave(e: WechatMiniprogram.TouchEvent) {
    const uuid = e.currentTarget.dataset.uuid as string
    if (this.data.saving) return
    this.setData({ saving: true, busyUuid: uuid })
    logger.info(LOG, '保存 AI 穿搭, uuid=', uuid)
    request({ url: '/ai-recommend/save', method: 'POST', data: { outfit_uuid: uuid }, showError: false })
      .then(() => {
        const all = (((this as any).allRows || []) as AiRow[]).map((it) =>
          it.outfit_uuid === uuid
            ? { ...it, status: OUTFIT_STATUS.NORMAL, _status: outfitStatusPill({ ...it, status: OUTFIT_STATUS.NORMAL }) }
            : it
        )
        ;(this as any).allRows = all
        this.applySplit(all)
        this.setData({ saving: false, busyUuid: '' })
        this.toast('已保存，可在「已保存」查看')
      })
      .catch((err: any) => {
        this.setData({ saving: false, busyUuid: '' })
        const code = err && err.code
        logger.warn(LOG, '保存 AI 穿搭失败, uuid=', uuid, 'code=', code)
        if (code === 40000) {
          // 超过 7 天被后端定时清理：本地同步移除，避免用户反复点必然失败的按钮
          this.removeLocal(uuid)
          this.toast('这套搭配已被清理，请重新生成')
          return
        }
        const detail = (err && err.details && err.details[0]) || (err && err.message) || ''
        this.toast(detail || '保存失败，请稍后重试')
      })
  },

  // 删除入口：弹 v2 玻璃确认层
  onDelete(e: WechatMiniprogram.TouchEvent) {
    const uuid = e.currentTarget.dataset.uuid as string
    this.setData({
      delVisible: true,
      delUuid: uuid,
      delText: '删除后不可恢复，这套 AI 生成的搭配会从列表中移除。',
    })
  },

  onDelCancel() {
    this.setData({ delVisible: false })
  },

  onDelConfirm(e: WechatMiniprogram.CustomEvent) {
    this.setData({ delVisible: false })
    if (e.detail.value !== 'ok') return
    const uuid = this.data.delUuid
    if (!uuid || this.data.saving) return
    this.setData({ saving: true })
    request({ url: `/outfit/${uuid}`, method: 'DELETE', showError: false })
      .then(() => {
        logger.info(LOG, '删除 AI 穿搭成功, uuid=', uuid)
        this.setData({ saving: false })
        this.removeLocal(uuid)
        this.toast('已删除')
      })
      .catch((err: any) => {
        this.setData({ saving: false })
        const code = err && err.code
        logger.warn(LOG, '删除 AI 穿搭失败, uuid=', uuid, 'code=', code)
        if (code === 40000) {
          this.removeLocal(uuid)
          this.toast('这套搭配已不存在')
          return
        }
        const detail = (err && err.details && err.details[0]) || (err && err.message) || ''
        this.toast(detail || '删除失败，请稍后重试')
      })
  },

  // 本地移除（删除成功，或后端已清理）
  removeLocal(uuid: string) {
    const all = (((this as any).allRows || []) as AiRow[]).filter((it) => it.outfit_uuid !== uuid)
    ;(this as any).allRows = all
    this.applySplit(all)
  },

  // 重新生成：回到 AI 推荐流程（会再消耗 1 次推荐额度）
  onRegen() {
    wx.navigateTo({
      url: '/pages/ai-recommend/ai-recommend',
      fail: (e) => logger.warn(LOG, 'navigateTo AI 推荐失败, err=', e && e.errMsg),
    })
  },

  onDetail(e: WechatMiniprogram.TouchEvent) {
    const uuid = e.currentTarget.dataset.uuid as string
    logger.debug(LOG, '点击 AI 穿搭, uuid=', uuid)
    wx.navigateTo({
      url: `/pages/outfit-detail/outfit-detail?uuid=${uuid}&owner=1`,
      fail: (err) => logger.warn(LOG, 'navigateTo 穿搭详情失败, err=', err && err.errMsg),
    })
  },

  onGoGenerate() {
    this.onRegen()
  },

  // 轻量反馈：先置 false 再置 true，确保连续提示也能重新触发自动关闭
  toast(text: string) {
    this.setData({ toastVisible: false, toastText: text })
    wx.nextTick(() => this.setData({ toastVisible: true }))
  },

  onToastClose() {
    this.setData({ toastVisible: false })
  },
})