import { UUIDType } from "./types";
import IndexedDBHandler from "./indexed-db-handler";
import StorageHandler from "./storage-handler";

export default class UUIDManager {
  storageHandler: StorageHandler;
  indexedDBHandler: IndexedDBHandler | null;

  constructor() {
    this.indexedDBHandler = null;
    this.storageHandler = StorageHandler.getInstance();
    if ("indexedDB" in window) {
      this.indexedDBHandler = IndexedDBHandler.getInstance();
    }
  }

  /**
   * indexedDBHandler가 있으면 indexedDBHandler에 없으면 storageHandler에 set 함수 호출.
   *
   * @public
   * @param uuidType
   * @param uuidValue
   */
  async set(uuidType: UUIDType, uuidValue: string): Promise<void> {
    if (this.indexedDBHandler) {
      await this.indexedDBHandler.set(uuidType, uuidValue);
    } else {
      this.storageHandler.set(uuidType, uuidValue);
    }
  }

  /**
   * indexedDBHandler가 있으면 indexedDBHandler에 없으면 storageHandler에 get 함수 호출.
   *
   * @public
   * @param uuidType
   */
  async get(uuidType: UUIDType): Promise<string> {
    if (this.indexedDBHandler) {
      return await this.indexedDBHandler.get(uuidType);
    } else {
      return this.storageHandler.get(uuidType);
    }
  }

  /**
   * indexedDBHandler가 있으면 indexedDBHandler에 없으면 storageHandler에 delete 함수 호출.
   *
   * @public
   * @param uuidType
   */
  async delete(uuidType: UUIDType): Promise<void> {
    if (this.indexedDBHandler) {
      await this.indexedDBHandler.delete(uuidType);
    } else {
      this.storageHandler.delete(uuidType);
    }
  }

  /**
   * storageHandler clear함수 호출 후 indexedDBHandler가 있으면 indexedDBHandler clear함수 호출.
   *
   * @public
   */
  async clear(): Promise<void> {
    this.storageHandler.clear();
    if (this.indexedDBHandler) {
      await this.indexedDBHandler.clear();
    }
  }
}