// miniprogram/utils/payment.js
// 微信支付工具类

const app = getApp()

/**
 * 发起微信支付
 * @param {Object} options - 支付选项
 * @param {String} options.orderId - 订单ID
 * @param {Number} options.amount - 支付金额(元)
 * @param {String} options.description - 商品描述
 * @param {Function} options.success - 成功回调
 * @param {Function} options.fail - 失败回调
 */
function wxPay(options) {
  const { orderId, amount, description, success, fail } = options
  
  wx.showLoading({
    title: '正在支付...',
    mask: true
  })

  // 1. 调用后端创建支付订单
  wx.request({
    url: `${app.globalData.apiBase}/payment/create`,
    method: 'POST',
    header: {
      'Authorization': `Bearer ${wx.getStorageSync('token')}`
    },
    data: {
      orderId,
      amount,
      description,
      paymentMethod: 'wechat'
    },
    success: (res) => {
      wx.hideLoading()
      
      if (res.statusCode === 200) {
        const paymentData = res.data
        
        // 2. 调起微信支付
        wx.requestPayment({
          timeStamp: paymentData.timeStamp,
          nonceStr: paymentData.nonceStr,
          package: paymentData.package,
          signType: paymentData.signType || 'RSA',
          paySign: paymentData.paySign,
          success: (payRes) => {
            console.log('支付成功', payRes)
            
            // 3. 通知后端支付成功
            notifyPaymentSuccess(orderId, paymentData.prepayId)
            
            wx.showToast({
              title: '支付成功',
              icon: 'success',
              duration: 2000
            })
            
            success && success(payRes)
          },
          fail: (payErr) => {
            console.error('支付失败', payErr)
            
            if (payErr.errMsg.indexOf('cancel') !== -1) {
              wx.showToast({
                title: '支付已取消',
                icon: 'none'
              })
            } else {
              wx.showToast({
                title: '支付失败',
                icon: 'none'
              })
            }
            
            fail && fail(payErr)
          }
        })
      } else {
        wx.showToast({
          title: res.data.message || '创建订单失败',
          icon: 'none'
        })
        fail && fail(res)
      }
    },
    fail: (err) => {
      wx.hideLoading()
      console.error('请求失败', err)
      
      wx.showToast({
        title: '网络请求失败',
        icon: 'none'
      })
      
      fail && fail(err)
    }
  })
}

/**
 * 通知后端支付成功
 * @param {String} orderId 
 * @param {String} prepayId 
 */
function notifyPaymentSuccess(orderId, prepayId) {
  wx.request({
    url: `${app.globalData.apiBase}/payment/notify`,
    method: 'POST',
    header: {
      'Authorization': `Bearer ${wx.getStorageSync('token')}`
    },
    data: {
      orderId,
      prepayId,
      status: 'success'
    },
    success: (res) => {
      console.log('支付通知成功', res)
    },
    fail: (err) => {
      console.error('支付通知失败', err)
    }
  })
}

/**
 * 查询订单状态
 * @param {String} orderId 
 * @param {Function} callback 
 */
function queryOrderStatus(orderId, callback) {
  wx.request({
    url: `${app.globalData.apiBase}/payment/query`,
    method: 'GET',
    header: {
      'Authorization': `Bearer ${wx.getStorageSync('token')}`
    },
    data: { orderId },
    success: (res) => {
      if (res.statusCode === 200) {
        callback && callback(true, res.data)
      } else {
        callback && callback(false, null)
      }
    },
    fail: () => {
      callback && callback(false, null)
    }
  })
}

/**
 * 购买完整电子书
 * @param {Function} success 
 * @param {Function} fail 
 */
function purchaseFullBook(success, fail) {
  // 计算动态价格：9.9 + (天数 * 1元)
  const basePrice = 9.9
  const startDate = new Date('2025-01-01') // 书籍上架日期
  const today = new Date()
  const daysPassed = Math.floor((today - startDate) / (1000 * 60 * 60 * 24))
  const currentPrice = basePrice + daysPassed
  
  const orderId = `ORDER_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`
  
  wxPay({
    orderId,
    amount: currentPrice,
    description: 'Soul派对·创业实验 完整版',
    success: (res) => {
      // 更新本地购买状态
      updatePurchaseStatus(true)
      success && success(res)
    },
    fail
  })
}

/**
 * 更新购买状态
 * @param {Boolean} isPurchased 
 */
function updatePurchaseStatus(isPurchased) {
  const userInfo = app.getUserInfo()
  if (userInfo) {
    userInfo.isPurchased = isPurchased
    wx.setStorageSync('userInfo', userInfo)
    app.globalData.userInfo = userInfo
  }
}

/**
 * 检查是否已购买
 * @returns {Boolean}
 */
function checkPurchaseStatus() {
  const userInfo = app.getUserInfo()
  return userInfo ? userInfo.isPurchased : false
}

module.exports = {
  wxPay,
  queryOrderStatus,
  purchaseFullBook,
  checkPurchaseStatus,
  updatePurchaseStatus
}