import fs from "fs";
import PATH from "path";

import BackendStorageInterface from "./BackendStorageInterface";

class FS implements BackendStorageInterface {
  async set(key: string, value: string) {
    if (value && value !== '""' && !fs.existsSync(PATH.dirname(key))) {
      fs.mkdirSync(PATH.dirname(key), { recursive: true });
    }
    if (!value || value === '""') {
      return await this.remove(key);
    }
    return fs.writeFileSync(key, value);
  }

  async get(key: string) {
    if (!fs.existsSync(key)) {
      return '""';
    }
    return fs.readFileSync(key);
  }

  async remove(key: string) {
    if (!fs.existsSync(key)) {
      return;
    }
    fs.unlinkSync(key);
    while (fs.readdirSync(PATH.dirname(key)).length === 0) {
      key = PATH.dirname(key);
      fs.rmdirSync(key);
    }
  }

  async list(key: string) {
    if (!fs.existsSync(key)) {
      return [];
    }
    return fs.readdirSync(key);
  }
}

export { FS };