ertonglianxibiao/pages/detail/detail.js

import { injectPage } from '@jdmini/api'
const { getWorksheetDetail, checkPoints, deductPoints } = require('../../utils/api.js')
const { DATA_BASE_URL } = require('../../utils/config.js')

Page(injectPage({})({
  data: {
    dataBaseUrl: DATA_BASE_URL,
    id: null,
    detail: {},
    recommended: [],
    loading: false,
    downloadedPath: ''
  },

  onLoad(options) {
    if (options.id) {
      this.setData({ id: Number(options.id) })
      this.loadDetail()
    }
  },

  onShareAppMessage() {
    const userId = wx.getStorageSync('userId')
    let path = `/pages/detail/detail?id=${this.data.id}`
    // 携带邀请人ID
    if (userId) {
      path += `&inviter=${userId}`
    }
    return {
      title: this.data.detail.title || '儿童练习表',
      path: path,
      imageUrl: DATA_BASE_URL + this.data.detail.coverurl
    }
  },

  // 加载详情
  async loadDetail() {
    try {
      this.setData({ loading: true })

      const res = await getWorksheetDetail(this.data.id)
      if (res.success) {
        // 设置导航栏标题
        wx.setNavigationBarTitle({
          title: res.data.detail.title || '练习表详情'
        })

        this.setData({
          detail: res.data.detail || {},
          recommended: res.data.recommended || [],
          loading: false
        })
      }
    } catch (error) {
      console.error('加载详情失败:', error)
      this.setData({ loading: false })
      wx.showToast({
        title: '加载失败',
        icon: 'none'
      })
    }
  },

  // 预览封面大图
  previewImage() {
    const url = DATA_BASE_URL + this.data.detail.coverurl
    wx.previewImage({
      current: url,
      urls: [url]
    })
  },

  // 预览PDF
  previewPdf() {
    const pdfUrl = DATA_BASE_URL + this.data.detail.pdfurl

    wx.showLoading({
      title: '加载中...',
      mask: true
    })

    // 先下载PDF文件
    wx.downloadFile({
      url: pdfUrl,
      success: (res) => {
        wx.hideLoading()
        if (res.statusCode === 200) {
          // 打开PDF文档
          wx.openDocument({
            filePath: res.tempFilePath,
            fileType: 'pdf',
            showMenu: true,
            success: () => {
              console.log('PDF打开成功')
            },
            fail: (err) => {
              console.error('打开PDF失败:', err)
              wx.showToast({
                title: '打开失败',
                icon: 'none'
              })
            }
          })
        }
      },
      fail: (err) => {
        wx.hideLoading()
        console.error('下载PDF失败:', err)
        wx.showToast({
          title: '加载失败',
          icon: 'none'
        })
      }
    })
  },

  // 检查是否已下载过
  hasDownloaded(worksheetId) {
    const downloads = wx.getStorageSync('downloads') || []
    return downloads.some(d => d.id === worksheetId)
  },

  // 下载PDF
  async downloadPdf() {
    // 1. 检查是否登录
    const userId = wx.getStorageSync('userId')
    if (!userId) {
      wx.showModal({
        title: '提示',
        content: '请先登录后再下载',
        confirmText: '去登录',
        cancelText: '取消',
        success: (res) => {
          if (res.confirm) {
            // 保存返回信息
            wx.setStorageSync('returnTo', {
              type: 'navigateTo',
              url: `/pages/detail/detail?id=${this.data.id}`
            })
            wx.navigateTo({
              url: '/pages/login/login'
            })
          }
        }
      })
      return
    }

    // 2. 检查是否已下载过（已下载过的不扣积分）
    const alreadyDownloaded = this.hasDownloaded(this.data.id)

    // 3. 如果未下载过，检查积分
    if (!alreadyDownloaded) {
      try {
        const pointsRes = await checkPoints(userId)
        if (!pointsRes.success || !pointsRes.data.canDownload) {
          wx.showModal({
            title: '积分不足',
            content: `下载需要 ${pointsRes.data?.costPoints || 1} 积分，您当前积分为 ${pointsRes.data?.points || 0}。分享小程序可获得积分！`,
            confirmText: '去分享',
            cancelText: '取消',
            success: (res) => {
              if (res.confirm) {
                // 触发分享
                this.shareToGetPoints()
              }
            }
          })
          return
        }
      } catch (error) {
        console.error('检查积分失败:', error)
        wx.showToast({
          title: '网络错误',
          icon: 'none'
        })
        return
      }
    }

    // 4. 开始下载
    const pdfUrl = DATA_BASE_URL + this.data.detail.pdfurl
    const title = this.data.detail.e_title || this.data.detail.title || 'worksheet'
    const fileName = `${title}.pdf`

    wx.showLoading({
      title: '下载中...',
      mask: true
    })

    try {
      let remainingPoints = null

      // 只有首次下载才扣积分
      if (!alreadyDownloaded) {
        const deductRes = await deductPoints(userId, this.data.id)
        if (!deductRes.success) {
          wx.hideLoading()
          wx.showToast({
            title: deductRes.message || '扣除积分失败',
            icon: 'none'
          })
          return
        }
        remainingPoints = deductRes.data.remainingPoints
      }

      // 下载文件
      wx.downloadFile({
        url: pdfUrl,
        success: (res) => {
          wx.hideLoading()
          if (res.statusCode === 200) {
            const tempFilePath = res.tempFilePath

            // 保存到本地
            const fs = wx.getFileSystemManager()
            const savedPath = `${wx.env.USER_DATA_PATH}/${fileName}`

            fs.saveFile({
              tempFilePath: tempFilePath,
              filePath: savedPath,
              success: (saveRes) => {
                this.setData({ downloadedPath: saveRes.savedFilePath })

                // 保存下载记录
                this.saveDownloadRecord()

                // 根据是否是首次下载显示不同提示
                let content = '文件已保存，是否立即打开？'
                if (!alreadyDownloaded && remainingPoints !== null) {
                  content = `文件已保存，消耗1积分，剩余${remainingPoints}积分。是否立即打开？`
                } else if (alreadyDownloaded) {
                  content = '文件已保存（已购买，无需扣分）。是否立即打开？'
                }

                wx.showModal({
                  title: '下载成功',
                  content: content,
                  confirmText: '打开',
                  cancelText: '稍后',
                  success: (modalRes) => {
                    if (modalRes.confirm) {
                      wx.openDocument({
                        filePath: saveRes.savedFilePath,
                        fileType: 'pdf',
                        showMenu: true
                      })
                    }
                  }
                })
              },
              fail: (err) => {
                console.error('保存文件失败:', err)
                // 如果保存失败，直接打开临时文件
                wx.showModal({
                  title: '下载成功',
                  content: '是否立即打开？',
                  confirmText: '打开',
                  cancelText: '稍后',
                  success: (modalRes) => {
                    if (modalRes.confirm) {
                      wx.openDocument({
                        filePath: tempFilePath,
                        fileType: 'pdf',
                        showMenu: true
                      })
                    }
                  }
                })
              }
            })
          }
        },
        fail: (err) => {
          wx.hideLoading()
          console.error('下载失败:', err)
          wx.showToast({
            title: '下载失败',
            icon: 'none'
          })
        }
      })
    } catch (error) {
      wx.hideLoading()
      console.error('下载失败:', error)
    }
  },

  // 分享获取积分
  shareToGetPoints() {
    wx.showToast({
      title: '点击右上角分享给好友',
      icon: 'none',
      duration: 2000
    })
  },

  // 保存下载记录
  saveDownloadRecord() {
    try {
      const downloads = wx.getStorageSync('downloads') || []
      const record = {
        id: this.data.id,
        title: this.data.detail.title,
        e_title: this.data.detail.e_title,
        coverurl: this.data.detail.coverurl,
        pdfurl: this.data.detail.pdfurl,
        category_name: this.data.detail.category_name,
        downloadTime: Date.now(),
        filePath: this.data.downloadedPath
      }

      // 检查是否已存在
      const existIndex = downloads.findIndex(d => d.id === record.id)
      if (existIndex > -1) {
        downloads[existIndex] = record
      } else {
        downloads.unshift(record)
      }

      // 最多保存100条
      if (downloads.length > 100) {
        downloads.pop()
      }

      wx.setStorageSync('downloads', downloads)
    } catch (error) {
      console.error('保存下载记录失败:', error)
    }
  },

  // 打印PDF
  printPdf() {
    const pdfUrl = DATA_BASE_URL + this.data.detail.pdfurl

    wx.showLoading({
      title: '准备打印...',
      mask: true
    })

    // 先下载PDF
    wx.downloadFile({
      url: pdfUrl,
      success: (res) => {
        wx.hideLoading()
        if (res.statusCode === 200) {
          // 微信小程序没有直接打印API，引导用户通过打开文档后使用系统打印
          wx.openDocument({
            filePath: res.tempFilePath,
            fileType: 'pdf',
            showMenu: true,
            success: () => {
              wx.showToast({
                title: '请点击右上角菜单进行打印',
                icon: 'none',
                duration: 3000
              })
            },
            fail: (err) => {
              console.error('打开PDF失败:', err)
              wx.showToast({
                title: '打开失败',
                icon: 'none'
              })
            }
          })
        }
      },
      fail: (err) => {
        wx.hideLoading()
        console.error('下载失败:', err)
        wx.showToast({
          title: '加载失败',
          icon: 'none'
        })
      }
    })
  },

  // 跳转到其他详情
  goDetail(e) {
    const id = e.currentTarget.dataset.id
    wx.redirectTo({
      url: `/pages/detail/detail?id=${id}`
    })
  }
}))