import {ICache} from './cache.interface';
import {ISerializable} from './serializeable.interface';
import {Injectable} from '@angular/core';

@Injectable()
export class MemoryCacheService implements ICache {
  private memoryCache = new Map();

  get<T extends ISerializable>(key: string, type: {new(): ISerializable}): T {
    return this.restore<T>(key, new type());
  }

  restore<T extends ISerializable>(key: string, restoreInto: ISerializable): T {
    return <T>this.memoryCache.get(key);
  }

  set(key: string, data: ISerializable): string {
    this.memoryCache.set(key, data);
    return key;
  }

  delete(key: string): boolean {
    const exists = this.keyExists(key);

    if (exists) {
      this.memoryCache.delete(key);
    }

    return exists;
  }

  clear(): void {
    this.memoryCache.clear();
  }

  keyExists(key: string): boolean {
    return !!this.memoryCache.get(key);
  }
}