<?php

use Illuminate\Support\Arr;
use Illuminate\Support\Str;

if (! function_exists('enum')) {
    function enum($key)
    {
        // add a dot at the end of string to prevent undefined offset
        $key .= Str::of($key)->contains(".") ? "" : ".";

        // the first parameter of all enum keys are its filename
        [$filename, $key] = explode(".", $key, 2);

        // because we do not want to load the file every time use require
        $enums = require app_path("Enums/$filename.php");

        // if the key that user provided not exists then null return
        $enums = Arr::get($enums, $key, null);

        // if enum null means that key not found
        throw_if($enums === null, 'Exception', "Undefined enum '{$key}'");

        // if enum value is array its mean that user want to use it as collection
        return is_array($enums) ? collect($enums) : $enums;
    }
}