var uploadFile = function () {
  // format for URL encoding of more characters
  var camSafeUrlEncode = function (str) {
    return encodeURIComponent(str)
      .replace(/!/g, '%21')
      .replace(/'/g, '%27')
      .replace(/\\(/g, '%28')
      .replace(/\\)/g, '%29')
      .replace(/\\*/g, '%2A');
  };

  // Obtain the signature
  var getAuthorization = function (options, callback) {
    wx.request({
      method: 'GET',
      // Replace with your server address to get the signature for post upload
      url: 'http://127.0.0.1:3000/post-policy?ext=' + options.ext,
      dataType: 'json',
      success: function (result) {
        var data = result.data;
        if (data) {
          callback(data);
        } else {
          wx.showModal({
            title: 'Failed to obtain temporary key',
            content: JSON.stringify(data),
            showCancel: false,
          });
        }
      },
      error: function (err) {
        wx.showModal({
          title: 'Failed to obtain temporary key',
          content: JSON.stringify(err),
          showCancel: false,
        });
      },
    });
  };
    
   /**
   * prefix: URL for COS requests
   * filePath: File path of the mini program selected for upload
   * key: Upload path for cos
   * formData: Authentication parameters returned by the server
   */
  var postFile = function ({ prefix, filePath, key, formData }) {
    var requestTask = wx.uploadFile({
      url: prefix,
      name: 'file',
      filePath: filePath,
      formData: formData,
      success: function (res) {
        var url = prefix + '/' + camSafeUrlEncode(key).replace(/%2F/g, '/');
        if (res.statusCode === 200) {
          wx.showModal({ title: 'Upload succeeded', content: url, showCancel: false });
        } else {
          wx.showModal({
            title: 'Upload failed',
            content: JSON.stringify(res),
            showCancel: false,
          });
        }
        console.log(res.header['x-cos-request-id']);
        console.log(res.statusCode);
        console.log(url);
      },
      fail: function (res) {
        wx.showModal({
          title: 'Upload failed',
          content: JSON.stringify(res),
          showCancel: false,
        });
      },
    });
    requestTask.onProgressUpdate(function (res) {
      console.log('Current progress:', res);
    });
  };

  // Upload documents.
  var uploadFile = function (filePath) {
    var extIndex = filePath.lastIndexOf('.');
    var fileExt = extIndex >= -1 ? filePath.substr(extIndex + 1) : '';
    // Pass in the file extension, and the server-side generates a signed url
    getAuthorization({ ext: fileExt }, function (AuthData) {
      // Check whether the AuthData format is correct
      console.log(AuthData);
      // Parameters used in the request
      var prefix = 'https://' + AuthData.cosHost; // Request url
      var key = AuthData.cosKey; // Let the server-side determine the filename for greater security.
      var formData = {
        key: key,
        success_action_status: 200,
        'Content-Type': '',
        'q-sign-algorithm': AuthData.qSignAlgorithm,
        'q-ak': AuthData.qAk,
        'q-key-time': AuthData.qKeyTime,
        'q-signature': AuthData.qSignature,
        policy: AuthData.policy,
      };
      if (AuthData.securityToken)
        formData['x-cos-security-token'] = AuthData.securityToken;
      postFile({ prefix, filePath, key, formData });
    });
  };

  // Select file
  wx.chooseMedia({
    count: 1, // default 9
    sizeType: ['original'], // Can specify whether to use the original or compressed image. Defaults to original.
    sourceType: ['album', 'camera'], // Can specify source as album or camera. Defaults to both.
    success: function (res) {
      uploadFile(res.tempFiles[0].tempFilePath);
    },
  });
};

var uploadFile = function () {
  // url encode format for encoding more characters
  var camSafeUrlEncode = function (str) {
    return encodeURIComponent(str)
      .replace(/!/g, '%21')
      .replace(/'/g, '%27')
      .replace(/\\(/g, '%28')
      .replace(/\\)/g, '%29')
      .replace(/\\*/g, '%2A');
  };

  // Obtain the signature
  var getAuthorization = function (options, callback) {
    wx.request({
      method: 'GET',
      // Replace with your server address to obtain the signature for put upload
      url: 'http://127.0.0.1:3000/put-sign?ext=' + options.ext,
      dataType: 'json',
      success: function (result) {
        var data = result.data;
        if (data) {
          callback(data);
        } else {
          wx.showModal({
            title: 'Failed to obtain temporary key',
            content: JSON.stringify(data),
            showCancel: false,
          });
        }
      },
      error: function (err) {
        wx.showModal({
          title: 'Failed to obtain temporary key',
          content: JSON.stringify(err),
          showCancel: false,
        });
      },
    });
  };

 /**
 * prefix: Request url for cos
 * filePath: File path of the file selected for upload in the mini program
 * key: Path for uploading to cos
 * formData: Authentication parameters returned by the server
 */
  var putFile = function ({ prefix, filePath, key, AuthData }) {
    // put upload requires reading the actual content of the file for uploading.
    const wxfs = wx.getFileSystemManager();
    wxfs.readFile({
      filePath: filePath,
      success: function (fileRes) {
        var requestTask = wx.request({
          url: prefix + '/' + key,
          method: 'PUT',
          header: {
            Authorization: AuthData.authorization,
            'x-cos-security-token': AuthData.securityToken,
          },
          data: fileRes.data,
          success: function success(res) {
            var url = prefix + '/' + camSafeUrlEncode(key).replace(/%2F/g, '/');
            if (res.statusCode === 200) {
              wx.showModal({
                title: 'Upload succeeded',
                content: url,
                showCancel: false,
              });
            } else {
              wx.showModal({
                title: 'Upload failed',
                content: JSON.stringify(res),
                showCancel: false,
              });
            }
            console.log(res.statusCode);
            console.log(url);
          },
          fail: function fail(res) {
            wx.showModal({
              title: 'Upload failed',
              content: JSON.stringify(res),
              showCancel: false,
            });
          },
        });
      },
    });
  };

  // Upload documents.
  var uploadFile = function (filePath) {
    var extIndex = filePath.lastIndexOf('.');
    var fileExt = extIndex >= -1 ? filePath.substr(extIndex + 1) : '';
    getAuthorization({ ext: fileExt }, function (AuthData) {
      // Check whether the AuthData format is correct.
      console.log(AuthData);
      const prefix = 'https://' + AuthData.cosHost;
      const key = AuthData.cosKey;
      putFile({ prefix, filePath, key, AuthData });
    });
  };

  // Select file
  wx.chooseMedia({
    count: 1, // default 9
    sizeType: ['original'], // Can specify whether to use the original or compressed image. Defaults to original.
    sourceType: ['album', 'camera'], // Can specify source as album or camera. Defaults to both.
    success: function (res) {
      uploadFile(res.tempFiles[0].tempFilePath);
    },
  });
};