import { access } from 'node:fs';

import { CheckResult } from '../helpers';
import type { HealthIndicator } from '../types';

export interface FileSystemCheckOptions {
  /**
   * Absolute path to file or directory
   */
  path: string;

  /**
   * Access mode (see fs.access docs on nodejs website)
   */
  mode?: number;
}

/**
 * FileSystemIndicator checks if specified file or directory
 * exists and is accessible to the application
 *
 * TODO: Need to be tested! Especially modes.
 */
export abstract class FileSystemIndicator implements HealthIndicator {
  private path: string;
  private mode: number | undefined;

  constructor(options: FileSystemCheckOptions) {
    this.path = options.path;
    this.mode = options.mode;
  }

  /**
   * Проверяет, существует ли файл и есть ли к нему доступ
   */
  check(): Promise<CheckResult> {
    return new Promise((resolve, reject) => {
      access(this.path, this.mode, (error) => {
        if (error) {
          reject({ error });
          return;
        }
        resolve(CheckResult.up({ path: this.path }));
      });
    });
  }
}