/* ---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

export class Cache<T> {
  private static readonly enableDebugLogging = false;

  private readonly _data = new Map<number, readonly T[]>();
  private _idPool = 1;

  constructor(private readonly id: string) {}

  add(item: readonly T[]): number {
    const id = this._idPool++;
    this._data.set(id, item);
    this.logDebugInfo();
    return id;
  }

  get(pid: number, id: number): T | undefined {
    return this._data.has(pid) ? this._data.get(pid)![id] : undefined;
  }

  delete(id: number) {
    this._data.delete(id);
    this.logDebugInfo();
  }

  private logDebugInfo() {
    if (!Cache.enableDebugLogging) {
      return;
    }
    // eslint-disable-next-line no-console
    console.log(`${this.id} cache size — ${this._data.size}`);
  }
}