const app = getApp()

const FULL_BOOK_PRICE = 9.9

Page({
  data: {
    statusBarHeight: 44,
    navBarHeight: 88,
    id: '',
    title: '',
    partTitle: '',
    chapterTitle: '',
    content: '',
    contentNodes: '',
    contentType: 'text',
    loading: true,
    needPurchase: false,
    canAccess: false,
    error: '',
    price: 1,
    fullBookPrice: FULL_BOOK_PRICE,
    totalSections: 62,
    purchasedCount: 0,
    showFullBookOption: false,
    prevSection: null,
    nextSection: null,
    showShareModal: false,
    shareCopied: false,
    referralCode: '',
    shareLink: ''
  },

  onLoad(options) {
    const id = (options && options.id) ? decodeURIComponent(options.id) : ''
    const statusBarHeight = app.globalData.statusBarHeight || 44
    const navBarHeight = app.globalData.navBarHeight || (statusBarHeight + 44)
    this.setData({
      statusBarHeight,
      navBarHeight,
      id
    })
    this.syncUser()
    if (id) {
      this.loadAllSections().then(() => this.loadChapter(id))
    } else {
      this.setData({ loading: false, error: '缺少章节 id' })
    }
  },

  syncUser() {
    const purchasedSections = app.globalData.purchasedSections || []
    const hasFullBook = !!app.globalData.hasFullBook
    const total = this.data.totalSections || 62
    const purchasedCount = hasFullBook ? total : purchasedSections.length
    const user = app.globalData.userInfo || {}
    this.setData({
      purchasedCount,
      showFullBookOption: purchasedSections.length >= 3,
      referralCode: user.referralCode || ''
    })
  },

  allSectionsList: [],

  loadAllSections() {
    return app.request('/api/book/all-chapters').then((res) => {
      const list = (res && res.data) ? res.data : (res && res.chapters) ? res.chapters : []
      const total = res.totalSections || res.total || list.length
      const ids = list.map(s => s.id)
      this.allSectionsList = ids
      this.setData({ totalSections: total })
      this.syncUser()
      return list
    }).catch(() => [])
  },

  getPrevNext(currentId) {
    const list = this.allSectionsList
    if (!list || !list.length) return { prev: null, next: null }
    const i = list.indexOf(currentId)
    return {
      prev: i > 0 ? { id: list[i - 1], title: '' } : null,
      next: i >= 0 && i < list.length - 1 ? { id: list[i + 1], title: '' } : null
    }
  },

  loadChapter(id) {
    this.setData({ loading: true, error: '' })
    app.request('/api/book/chapter/' + encodeURIComponent(id))
      .then((res) => {
        if (!res || !res.success) {
          this.setData({ loading: false, error: res && res.error ? res.error : '加载失败' })
          return
        }
        const hasFullBook = !!app.globalData.hasFullBook
        const purchasedSections = app.globalData.purchasedSections || []
        const isPurchased = hasFullBook || purchasedSections.indexOf(res.id) >= 0
        const canAccess = !!res.isFree || isPurchased
        const raw = res.content || ''
        const isHtml = typeof raw === 'string' && (raw.indexOf('<') >= 0 && raw.indexOf('>') >= 0)
        const contentType = isHtml ? 'html' : 'text'
        const contentNodes = isHtml ? raw : null
        const content = isHtml ? '' : raw
        const lines = content.split('\n').filter(l => l.trim())
        const previewLineCount = Math.max(1, Math.ceil(lines.length * 0.2))
        const previewContent = lines.slice(0, previewLineCount).join('\n')
        const prevNext = this.getPrevNext(res.id)
        this.syncUser()
        this.setData({
          title: res.title || res.sectionTitle || '',
          partTitle: res.partTitle || '',
          chapterTitle: res.chapterTitle || '',
          content,
          contentNodes,
          contentType,
          needPurchase: !!res.needPurchase && !canAccess,
          canAccess,
          loading: false,
          error: '',
          price: res.price != null ? res.price : 1,
          previewContent,
          prevSection: prevNext.prev,
          nextSection: prevNext.next
        })
      })
      .catch((err) => {
        this.setData({
          loading: false,
          error: err && err.message ? err.message : '网络错误'
        })
      })
  },

  goBack() {
    wx.navigateBack({ fail: () => wx.switchTab({ url: '/pages/index/index' }) })
  },

  goChapters() {
    wx.switchTab({ url: '/pages/chapters/chapters' })
  },

  openShare() {
    const link = this.getShareLink()
    this.setData({ showShareModal: true, shareCopied: false, shareLink: link })
  },

  closeShare() {
    this.setData({ showShareModal: false })
  },

  getShareLink() {
    const baseUrl = app.globalData.baseUrl || 'https://soul.quwanzhi.com'
    const ref = this.data.referralCode ? '?ref=' + this.data.referralCode : ''
    return baseUrl + '/read/' + this.data.id + ref
  },

  copyLink() {
    const link = this.getShareLink()
    wx.setClipboardData({
      data: link,
      success: () => this.setData({ shareCopied: true })
    })
  },

  copyWechatText() {
    const link = this.getShareLink()
    const text = '📚 推荐阅读《' + this.data.title + '》\n\n' + (this.data.content || '').slice(0, 100) + '...\n\n👉 点击阅读：' + link
    wx.setClipboardData({
      data: text,
      success: () => wx.showToast({ title: '已复制，请粘贴到微信发送', icon: 'none' })
    })
  },

  copyMomentText() {
    const link = this.getShareLink()
    const text = '📚 ' + this.data.title + '\n' + link
    wx.setClipboardData({
      data: text,
      success: () => wx.showToast({ title: '朋友圈文案已复制', icon: 'none' })
    })
  },

  goReferral() {
    this.setData({ showShareModal: false })
    wx.navigateTo({ url: '/pages/referral/referral' })
  },

  goPrev() {
    const prev = this.data.prevSection
    if (prev && prev.id) wx.navigateTo({ url: '/pages/read/read?id=' + encodeURIComponent(prev.id) })
  },

  goNext() {
    const next = this.data.nextSection
    if (next && next.id) wx.navigateTo({ url: '/pages/read/read?id=' + encodeURIComponent(next.id) })
  },

  purchaseSection() {
    wx.showToast({ title: '请在小程序内完成支付', icon: 'none' })
    wx.navigateTo({ url: '/pages/chapters/chapters' })
  },

  purchaseFullBook() {
    wx.showToast({ title: '请在小程序内完成支付', icon: 'none' })
    wx.navigateTo({ url: '/pages/chapters/chapters' })
  }
})