import { resolve } from 'node:path'
import { homedir } from 'node:os'
import { cwd } from 'node:process'

// Special file extensions that node can natively import
export const IMPORT_HOOK_EXTENSIONS = ['.json', '.js', '.cjs', '.mjs']

/**
 * A simple function for resolving the path the user entered
 */
export function resolveEnvFilePath(userPath: string): string {
  // Make sure a home directory exist
  const home = homedir() as string | undefined
  if (home != null) {
    userPath = userPath.replace(/^~($|\/|\\)/, `${home}$1`)
  }
  return resolve(cwd(), userPath)
}
/**
 * A simple function that parses a comma separated string into an array of strings
 */
export function parseArgList(list: string): string[] {
  return list.split(',')
}

/**
 * A simple function to test if the value is a promise/thenable
 */
export function isPromise<T>(value?: T | PromiseLike<T>): value is PromiseLike<T> {
  return value != null
    && typeof value === 'object'
    && 'then' in value
    && typeof value.then === 'function'
}