import BackendStorageInterface from "./BackendStorageInterface";
import { crop } from "./utils";

class LocalStorage implements BackendStorageInterface {
  @crop
  async set(key: string, value: string) {
    if (!value || value === '""') {
      return await this.remove(key);
    }
    return localStorage.setItem(key, value);
  }

  @crop
  async get(key: string) {
    const value = localStorage.getItem(key);
    if (value === null) {
      return '""';
    }
    return value;
  }

  @crop
  async remove(key: string) {
    return localStorage.removeItem(key);
  }

  @crop
  async list(key: string) {
    const keys = [];
    for (let i = 0; i < localStorage.length; i++) {
      keys.push(localStorage.key(i));
    }
    const filteredKeys = new Set();
    for (const k of keys) {
      if (!k.startsWith(key)) {
        continue;
      }
      const splits = k.split(key)[1].split("/");
      const split = splits[0] === "" ? splits[1] : splits[0];
      filteredKeys.add(split);
    }
    return [...filteredKeys];
  }
}

export { LocalStorage };