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/**
 * Models data persistence for users' notifications.
 */
class NotificationUser extends baseModel {
  /**
   * Tracks open subscription channels for server-sent events. To support multiple sessions by the same user,
   *   keys are user IDs; values are Maps with timestamp keys and HTTP response object values.
   * @member {Map}
   * @static
   */
  static subscriptions = new Map();

  /**
   * Identifies the database table for this Model.
   * @static
   * @returns {string} Names of the database table.
   */
  static get tableName() {
    return 'notification_user';
  }

  /**
   * Identifies the primary key fields for this Model.
   * @static
   * @returns {string[]} Names of the primary key fields.
   */
  static get idColumn() {
    return ['notification_id', 'user_id'];
  }

  /**
   * Supports validating instances of this Model class.
   * @static
   * @returns {Object} A description of valid instances.
   */
  static get jsonSchema() {
    return {
      type: 'object',
      required: ['user_id'],
      properties: {
        notification_id: { type: 'string' },
        user_id: { type: 'string' },
        alert: { type: 'boolean' },
        status: {
          type: 'string',
          /**
           * @name userNotificationStatusType
           * @desc Enumerated type for user notification status.
           * @enum
           * */
          enum: ['Unread', 'Read', 'Archived'],
        },
        ...this.baseProperties,
      },
      additionalProperties: false,
    };
  }

  /**
   * Defines this Model's associations with other Models.
   * @static
   * @returns {Object} A description of Model associations.
   */
  static get relationMappings() {
    return {
      notification: {
        relation: Model.BelongsToOneRelation,
        modelClass: Notification,
        join: {
          from: 'notification_user.notification_id',
          to: 'notification.notification_id',
        },
      },
    };
  }

  // other custom methods not shown here.
}