var dataBucketName = 'pocloud-data';
var bucketRegion = 'us-east-1';
var IdentityPoolId = 'us-east-1:4ba4f2d0-ff79-446e-a510-ac16e411d3cc';

AWS.config.update({
  region: bucketRegion,
  credentials: new AWS.CognitoIdentityCredentials({
    IdentityPoolId: IdentityPoolId
  })
});

function getHtml(template) {
    return template.join('\n');
 }

var s3 = new AWS.S3({
  // apiVersion: '2006-03-01',
  params: {Bucket: dataBucketName}
});

function fixDeviceId(deviceId){
    deviceId = deviceId.replace(/:/g, "");
    deviceId = deviceId.replace("[", "");
    deviceId = deviceId.replace("]", "");
    return deviceId;
}

function checkDevice(deviceId) {
  deviceId = fixDeviceId(deviceId);
  // deviceId = deviceId.trim();
  if (!deviceId) {
    return alert('Device names must contain at least one non-space character.');
  }
  if (deviceId.indexOf('/') !== -1) {
    return alert('Device names cannot contain slashes.');
  }
  var deviceKey = encodeURIComponent(deviceId) + '/';
  s3.headObject({Key: deviceKey}, function(err, data) {
    if (!err) {
      // return alert('Device already exists.');
      return viewDevicefiles(deviceId);
    }
    if (err.code !== 'NotFound') {
      return alert('There was an error creating your device: ' + err.message);
    }
    s3.putObject({Key: deviceKey}, function(err, data) {
      if (err) {
        return alert('There was an error creating your device: ' + err.message);
      }
      // alert('Successfully created device.');
      return viewDevicefiles(deviceId);
    });
  });
}

function viewDevicefiles(deviceId) {
  deviceId = fixDeviceId(deviceId);
  var deviceFileKey = encodeURIComponent(deviceId) + '//';
  s3.listObjects({Prefix: deviceFileKey}, function(err, data) {
    if (err) {
      return alert('There was an error viewing your device: ' + err.message);
    }
    // `this` references the AWS.Response instance that represents the response
    var href = this.request.httpRequest.endpoint.href;
    var bucketUrl = href + dataBucketName + '/';
    console.log(data);

    var files = data.Contents.map(function(file) {
      var fileKey = file.Key;
      var fileUrl = bucketUrl + encodeURIComponent(fileKey);
      var fileFilename = fileKey.replace(deviceFileKey, '');
      var fileSize = file.Size / 1000;  // kB
      var lastModified = file.LastModified;
      console.log(file);
      return getHtml([
        '<tr>',
          '<td><a href="https://s3.amazonaws.com/' + dataBucketName + '/' + fileKey + '">' + fileFilename + '</a></td>',
          '<td>' + fileSize + ' kB</td>',
          '<td>' + lastModified + '</td>',
          '<td><button onclick="deleteFile(\'' + deviceId + "','" + fileKey + '\')">Delete</button>',
        '</tr>'
      ]);
    });
    var message = files.length ?
      '<h2>File List</h2>' :
      '<p>You do not have any files for this device. Please add files.</p>';
    var htmlTemplate = [
      '<h2>',
        'DeviceId: ' + deviceId,
      '</h2>',
      message,
      '<div class="row">',
        '<table class="table">',
          '<thead><tr><th>Filename</th><th>File Size</th><th>Last Modified</th><th></th></thead>',
          '<tbody>',
            getHtml(files),
          '</tbody>',
        '</table>',
      '</div>',
      '<input id="fileupload" type="file" accept="*">',
      '<button id="addfile" onclick="addFile(\'' + deviceId +'\')">',
        'Add File',
      '</button>',
    ]
    document.getElementById('fileApp').innerHTML = getHtml(htmlTemplate);
  });
}

function addFile(deviceId) {
  deviceId = fixDeviceId(deviceId);
  var files = document.getElementById('fileupload').files;
  if (!files.length) {
    return alert('Please choose a file to upload first.');
  }
  var file = files[0];
  var fileName = file.name;
  var deviceFileKey = encodeURIComponent(deviceId) + '//';

  var fileKey = deviceFileKey + fileName;
  s3.upload({
    Key: fileKey,
    Body: file,
    ACL: 'public-read'
  }, function(err, data) {
    if (err) {
      return alert('There was an error uploading your file: ', err.message);
    }
    alert('Successfully uploaded file.');
    viewDevicefiles(deviceId);
  });
}

function deleteFile(deviceId, fileKey) {
  deviceId = fixDeviceId(deviceId);
  s3.deleteObject({Key: fileKey}, function(err, data) {
    if (err) {
      return alert('There was an error deleting your file: ', err.message);
    }
    alert('Successfully deleted file.');
    viewDevicefiles(deviceId);
  });
}