<?php

/**
 * Class Text
 * @package App
 * @method static int length(string $string)
 * @method static string replace(string $string, string $search, string $replace)
 * @method static mixed index(string $string, string $search)
 * @method static string upper(string $string)
 * @method static string lower(string $string)
 * @method static string capitalize(string $string)
 */
class Text
{
    /**
     * @var array
     */
    public static $map = [
        'length' => [
            'name' => 'strlen',
        ],
        'replace' => [
            'name' => 'str_replace',
            'arguments' => [1, 2, 0],
        ],
        'index' => [
            'name' => 'strpos',
        ],
        'upper' => [
            'name' => 'strtoupper',
        ],
        'lower' => [
            'name' => 'strtolower',
        ],
        'capitalize' => [
            'name' => 'ucwords',
        ],
    ];

    /**
     * @param $name
     * @param $arguments
     * @return mixed
     * @throws Exception
     */
    public static function __callStatic($name, $arguments)
    {
        if (!isset(static::$map[$name])) {
            throw new Exception("Function `{$name}` not found");
        }
        $function = static::$map[$name]['name'];
        $parameters = static::parameters($name, $arguments);

        return call_user_func_array($function, $parameters);
    }

    /**
     * @param $name
     * @param $arguments
     * @return array
     * @throws Exception
     */
    private static function parameters($name, $arguments)
    {
        if (!isset(static::$map[$name]['arguments'])) {
            return $arguments;
        }

        $parameters = [];
        foreach (static::$map[$name]['arguments'] as $index) {
            if (!isset($arguments[$index])) {
                throw new Exception("Invalid arguments to `{$name}`");
            }
            $parameters[] = $arguments[$index];
        }
        return $parameters;
    }

}