import { mkdir } from 'fs'

/**
 * makes sure that a given folder exists, if it doesn't it creates one for you
 * @param  {string}         path                the path of the folder
 * @param  {permission}     mask                permission mask for the new folder to have
 * @param  {Function}       cb                  callback, gives null if the folder exists, otherwise gives the error
 * @return {undefined}                          see: callback
 */
function ensureExists(path, mask, cb) {
    if (typeof mask === 'function') {
        // Allow the `mask` parameter to be optional
        cb = mask
        mask = 0o744
    }
    mkdir(path, mask, function (err) {
        if (err) {
            if (err.code === 'EEXIST')
                cb(null) // Ignore the error if the folder already exists
            else cb(err) // Something else went wrong
        } else cb(null) // Successfully created folder
    })
}

export { ensureExists }