import { cosmiconfig } from 'cosmiconfig'
import { IConfigUtilOptions, ICosmicResult } from '../interfaces/index.js'

/**
 * A utility class for interacting with the cosmiconfig library. The generic
 * type T is the type of the config object that is returned.
 *
 * @example
 * import { CosmicUtil } from '@4lch4/lt-commander'
 *
 * interface MyConfig {
 *   alpha: string
 *   beta: number
 *   charlie: boolean
 * }
 *
 * const cosmicUtil = CosmicUtil<MyConfig>.init()
 */
export class CosmicUtil {
  constructor(protected options: IConfigUtilOptions) {}

  async load<T = { [key: string]: any }>(searchFrom?: string): Promise<ICosmicResult<T>> {
    const res = await cosmiconfig(this.options.appName).search(searchFrom)

    return {
      config: res?.config as T,
      filepath: res?.filepath,
      isEmpty: res?.isEmpty
    }
  }
}