const { request } = require('../../utils/request')

const INTERCEPT_STATUS_OPTIONS = [
  { value: '', label: '全部发布状态' },
  { value: 'blocked', label: '已拦截' },
  { value: 'published', label: '已发布' }
]

const INTERCEPT_REVIEW_STATUS_OPTIONS = [
  { value: '', label: '全部复核状态' },
  { value: 'pending', label: '待复核' },
  { value: 'confirmed_spam', label: '确认垃圾' },
  { value: 'approved_ham', label: '误判放行' },
  { value: 'none', label: '未进入复核' }
]

const APPEAL_STATUS_OPTIONS = [
  { value: 'pending', label: '待处理申诉' },
  { value: '', label: '全部申诉' },
  { value: 'approved', label: '已通过申诉' },
  { value: 'rejected', label: '已驳回申诉' }
]

const REVIEW_STATUS_TEXT = {
  none: '无',
  pending: '待复核',
  confirmed_spam: '确认垃圾',
  approved_ham: '误判放行'
}

const APPEAL_STATUS_TEXT = {
  none: '无',
  pending: '待处理',
  approved: '已通过',
  rejected: '已驳回'
}

function buildPager(total, page, pageSize) {
  const totalValue = Number(total || 0)
  const totalPages = Math.max(Math.ceil(totalValue / pageSize), 1)
  return {
    page,
    pageSize,
    total: totalValue,
    totalPages,
    hasPrev: page > 1,
    hasNext: page < totalPages
  }
}

Page({
  data: {
    loading: false,
    thresholdInput: '0.75',

    interceptKeyword: '',
    interceptStatusOptions: INTERCEPT_STATUS_OPTIONS,
    interceptStatusIndex: 1,
    interceptReviewStatusOptions: INTERCEPT_REVIEW_STATUS_OPTIONS,
    interceptReviewStatusIndex: 1,
    intercepts: [],
    interceptPager: buildPager(0, 1, 10),

    appealKeyword: '',
    appealStatusOptions: APPEAL_STATUS_OPTIONS,
    appealStatusIndex: 0,
    appeals: [],
    appealPager: buildPager(0, 1, 10),

    reviewNoteMap: {},
    appealNoteMap: {}
  },

  formatPercent(value, digits = 2) {
    const num = Number(value || 0)
    return `${(num * 100).toFixed(digits)}%`
  },

  onShow() {
    this.bootstrap()
  },

  onPullDownRefresh() {
    this.bootstrap(true)
  },

  async bootstrap(fromPullDown = false) {
    this.setData({ loading: true })
    try {
      await Promise.all([this.fetchThreshold(), this.fetchIntercepts(), this.fetchAppeals()])
    } finally {
      this.setData({ loading: false })
      if (fromPullDown) wx.stopPullDownRefresh()
    }
  },

  async fetchThreshold() {
    const data = await request({ url: '/admin/detection/threshold' })
    this.setData({ thresholdInput: String(data.spam_threshold || 0.75) })
  },

  normalizeIntercepts(rows = []) {
    return rows.map((item) => ({
      ...item,
      created_text: (item.created_at || '').replace('T', ' ').slice(0, 19),
      review_status_text: REVIEW_STATUS_TEXT[item.manual_review_status] || item.manual_review_status,
      spam_probability_text: this.formatPercent(item.spam_probability, 2),
      appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status
    }))
  },

  normalizeAppeals(rows = []) {
    return rows.map((item) => ({
      ...item,
      created_text: (item.created_at || '').replace('T', ' ').slice(0, 19),
      appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status
    }))
  },

  async fetchIntercepts() {
    const {
      interceptPager,
      interceptKeyword,
      interceptStatusOptions,
      interceptStatusIndex,
      interceptReviewStatusOptions,
      interceptReviewStatusIndex
    } = this.data

    const status = interceptStatusOptions[interceptStatusIndex].value
    const reviewStatus = interceptReviewStatusOptions[interceptReviewStatusIndex].value
    const query = [
      `keyword=${encodeURIComponent((interceptKeyword || '').trim())}`,
      `status=${encodeURIComponent(status)}`,
      `review_status=${encodeURIComponent(reviewStatus)}`,
      `page=${interceptPager.page}`,
      `page_size=${interceptPager.pageSize}`
    ].join('&')

    const data = await request({ url: `/admin/intercepts?${query}` })
    this.setData({
      intercepts: this.normalizeIntercepts(data.items || []),
      interceptPager: buildPager(data.total || 0, interceptPager.page, interceptPager.pageSize)
    })
  },

  async fetchAppeals() {
    const { appealPager, appealKeyword, appealStatusOptions, appealStatusIndex } = this.data
    const status = appealStatusOptions[appealStatusIndex].value
    const query = [
      `keyword=${encodeURIComponent((appealKeyword || '').trim())}`,
      `status=${encodeURIComponent(status)}`,
      `page=${appealPager.page}`,
      `page_size=${appealPager.pageSize}`
    ].join('&')

    const data = await request({ url: `/admin/appeals?${query}` })
    this.setData({
      appeals: this.normalizeAppeals(data.items || []),
      appealPager: buildPager(data.total || 0, appealPager.page, appealPager.pageSize)
    })
  },

  onInput(e) {
    const field = e.currentTarget.dataset.field
    this.setData({ [field]: e.detail.value || '' })
  },

  onInterceptStatusChange(e) {
    this.setData({ interceptStatusIndex: Number(e.detail.value || 0) })
  },

  onInterceptReviewStatusChange(e) {
    this.setData({ interceptReviewStatusIndex: Number(e.detail.value || 0) })
  },

  onAppealStatusChange(e) {
    this.setData({ appealStatusIndex: Number(e.detail.value || 0) })
  },

  applyInterceptFilters() {
    this.setData({ interceptPager: { ...this.data.interceptPager, page: 1 } })
    this.fetchIntercepts()
  },

  clearInterceptFilters() {
    this.setData({
      interceptKeyword: '',
      interceptStatusIndex: 1,
      interceptReviewStatusIndex: 1,
      interceptPager: { ...this.data.interceptPager, page: 1 }
    })
    this.fetchIntercepts()
  },

  applyAppealFilters() {
    this.setData({ appealPager: { ...this.data.appealPager, page: 1 } })
    this.fetchAppeals()
  },

  clearAppealFilters() {
    this.setData({
      appealKeyword: '',
      appealStatusIndex: 0,
      appealPager: { ...this.data.appealPager, page: 1 }
    })
    this.fetchAppeals()
  },

  prevInterceptPage() {
    if (!this.data.interceptPager.hasPrev) return
    this.setData({ interceptPager: { ...this.data.interceptPager, page: this.data.interceptPager.page - 1 } })
    this.fetchIntercepts()
  },

  nextInterceptPage() {
    if (!this.data.interceptPager.hasNext) return
    this.setData({ interceptPager: { ...this.data.interceptPager, page: this.data.interceptPager.page + 1 } })
    this.fetchIntercepts()
  },

  prevAppealPage() {
    if (!this.data.appealPager.hasPrev) return
    this.setData({ appealPager: { ...this.data.appealPager, page: this.data.appealPager.page - 1 } })
    this.fetchAppeals()
  },

  nextAppealPage() {
    if (!this.data.appealPager.hasNext) return
    this.setData({ appealPager: { ...this.data.appealPager, page: this.data.appealPager.page + 1 } })
    this.fetchAppeals()
  },

  onReviewNoteInput(e) {
    const id = e.currentTarget.dataset.id
    this.setData({ [`reviewNoteMap.${id}`]: e.detail.value || '' })
  },

  onAppealNoteInput(e) {
    const id = e.currentTarget.dataset.id
    this.setData({ [`appealNoteMap.${id}`]: e.detail.value || '' })
  },

  async saveThreshold() {
    const value = Number(this.data.thresholdInput)
    if (Number.isNaN(value) || value <= 0 || value >= 1) {
      wx.showToast({ title: '阈值需在 0 到 1 之间', icon: 'none' })
      return
    }

    await request({
      url: '/admin/detection/threshold',
      method: 'PUT',
      data: { spam_threshold: value }
    })

    wx.showToast({ title: '阈值更新成功', icon: 'success' })
    this.fetchThreshold()
  },

  async reviewIntercept(e) {
    const id = Number(e.currentTarget.dataset.id)
    const decision = e.currentTarget.dataset.decision
    const note = (this.data.reviewNoteMap[id] || '').trim()

    await request({
      url: `/admin/intercepts/${id}/review`,
      method: 'PUT',
      data: {
        decision,
        note: note || (decision === 'spam' ? '人工复核确认为垃圾信息' : '人工复核后解除拦截')
      }
    })

    wx.showToast({ title: '复核完成', icon: 'success' })
    this.setData({ [`reviewNoteMap.${id}`]: '' })
    await Promise.all([this.fetchIntercepts(), this.fetchAppeals()])
  },

  async processAppeal(e) {
    const id = Number(e.currentTarget.dataset.id)
    const action = e.currentTarget.dataset.action
    const note = (this.data.appealNoteMap[id] || '').trim()

    await request({
      url: `/admin/appeals/${id}/process`,
      method: 'PUT',
      data: {
        action,
        note: note || (action === 'approve' ? '申诉通过，解除拦截' : '申诉驳回，维持拦截')
      }
    })

    wx.showToast({ title: '申诉处理完成', icon: 'success' })
    this.setData({ [`appealNoteMap.${id}`]: '' })
    await Promise.all([this.fetchIntercepts(), this.fetchAppeals()])
  }
})