/*
 * Copyright (c) 2016-present Invertase Limited & Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this library except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

export default class FirestorePath {
  static fromName(name: string): FirestorePath {
    return new FirestorePath(name.split('/'));
  }

  _parts: string[];

  constructor(pathComponents: string[] = []) {
    this._parts = pathComponents;
  }

  get id(): string {
    return this._parts.length ? this._parts[this._parts.length - 1]! : '';
  }

  get isDocument(): boolean {
    return this._parts.length % 2 === 0;
  }

  get isCollection(): boolean {
    return this._parts.length % 2 === 1;
  }

  get relativeName(): string {
    return this._parts.join('/');
  }

  child(relativePath: string): FirestorePath {
    return new FirestorePath(this._parts.concat(relativePath.split('/')));
  }

  parent(): FirestorePath | null {
    return this._parts.length > 1
      ? new FirestorePath(this._parts.slice(0, this._parts.length - 1))
      : null;
  }
}