function ensureToken() {
  const app = getApp()
  if (app.globalData.token) {
    return Promise.resolve(app.globalData.token)
  }
  if (app.globalData.useDevLogin) {
    return devLogin(app)
  }
  return wxLogin(app)
}

function devLogin(app) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: app.globalData.apiBaseUrl + '/api/auth/dev-miniapp-login',
      method: 'POST',
      data: {
        username: 'resident',
        password: 'dev'
      },
      success(res) {
        if (res.statusCode >= 200 && res.statusCode < 300 && res.data && res.data.code === 0) {
          app.globalData.token = res.data.data.token
          app.globalData.user = res.data.data
          resolve(app.globalData.token)
          return
        }
        reject(new Error((res.data && res.data.message) || '登录失败'))
      },
      fail: reject
    })
  })
}

function wxLogin(app) {
  return new Promise((resolve, reject) => {
    wx.login({
      success(loginResult) {
        if (!loginResult.code) {
          reject(new Error('微信登录失败'))
          return
        }
        wx.request({
          url: app.globalData.apiBaseUrl + '/api/auth/miniapp-login',
          method: 'POST',
          data: {
            code: loginResult.code
          },
          success(res) {
            if (res.statusCode >= 200 && res.statusCode < 300 && res.data && res.data.code === 0) {
              app.globalData.token = res.data.data.token
              app.globalData.user = res.data.data
              resolve(app.globalData.token)
              return
            }
            reject(new Error((res.data && res.data.message) || '登录失败'))
          },
          fail: reject
        })
      },
      fail: reject
    })
  })
}

function request(options) {
  const app = getApp()
  return new Promise((resolve, reject) => {
    ensureToken().then((token) => {
      wx.request({
        url: app.globalData.apiBaseUrl + options.url,
        method: options.method || 'GET',
        data: options.data || {},
        header: Object.assign({
          Authorization: token,
          satoken: token
        }, options.header || {}),
        success(res) {
          if (res.statusCode >= 200 && res.statusCode < 300 && res.data && res.data.code === 0) {
            resolve(res.data.data)
            return
          }
          reject(new Error((res.data && res.data.message) || '请求失败'))
        },
        fail: reject
      })
    }).catch(reject)
  })
}

function uploadFile(filePath) {
  const app = getApp()
  return new Promise((resolve, reject) => {
    ensureToken().then((token) => {
      wx.uploadFile({
        url: app.globalData.apiBaseUrl + '/api/files/upload',
        filePath,
        name: 'file',
        header: {
          Authorization: token,
          satoken: token
        },
        success(res) {
          let body = res.data
          if (typeof body === 'string') {
            try {
              body = JSON.parse(body)
            } catch (error) {
              reject(new Error('上传失败'))
              return
            }
          }
          if (res.statusCode >= 200 && res.statusCode < 300 && body && body.code === 0) {
            resolve(body.data)
            return
          }
          reject(new Error((body && body.message) || '上传失败'))
        },
        fail: reject
      })
    }).catch(reject)
  })
}

function yuan(cent) {
  return ((cent || 0) / 100).toFixed(2)
}

function statusText(status) {
  const map = {
    PENDING_CONFIRM: '待确认',
    PREPARING: '备货中',
    PENDING_DELIVERY: '待配送',
    PENDING_PICKUP: '待自提',
    DELIVERING: '配送中',
    DELIVERED: '已送达',
    COMPLETED: '已完成',
    CANCELED: '已取消',
    PENDING_REVIEW: '待审核',
    PUBLISHED: '已发布',
    REJECTED: '已驳回',
    OFF_SHELF: '已下架',
    SOLD: '已售出'
  }
  return map[status] || status || '-'
}

function setField(page, event) {
  const field = event.currentTarget.dataset.field
  if (!field) {
    return
  }
  page.setData({
    ['form.' + field]: event.detail.value
  })
}

module.exports = {
  request,
  uploadFile,
  yuan,
  statusText,
  setField
}