// Push Adapter
//
// Allows you to change the push notification mechanism.
//
// Adapter classes must implement the following functions:
// * getValidPushTypes()
// * send(devices, installations)
//
// Default is ParsePushAdapter, which uses GCM for
// android push and APNS for ios push.

export class PushAdapter {
  send(devices, installations) { }

  /**
   * Get an array of valid push types.
   * @returns {Array} An array of valid push types
   */
  getValidPushTypes() {
    return this.validPushTypes;
  }
  
  /**g
   * Classify the device token of installations based on its device type.
   * @param {Object} installations An array of installations
   * @param {Array} validPushTypes An array of valid push types(string)
   * @returns {Object} A map whose key is device type and value is an array of device
   */
  static classifyInstallation(installations, validPushTypes) {
    // Init deviceTokenMap, create a empty array for each valid pushType
    let deviceMap = {};
    for (let validPushType of validPushTypes) {
      deviceMap[validPushType] = [];
    }
    for (let installation of installations) {
      // No deviceToken, ignore
      if (!installation.deviceToken) {
        continue;
      }
      let pushType = installation.deviceType;
      if (deviceMap[pushType]) {
        deviceMap[pushType].push({
          deviceToken: installation.deviceToken,
          appIdentifier: installation.appIdentifier
        });
      } else {
        console.log('Unknown push type from installation %j', installation);
      }
    }
    return deviceMap;
  }
}

export default PushAdapter;