<?php

namespace Barn2\Plugin\WC_Product_Options\Dependencies\NXP\Classes;

use Barn2\Plugin\WC_Product_Options\Dependencies\NXP\Exception\IncorrectNumberOfFunctionParametersException;
use ReflectionException;
use ReflectionFunction;
class CustomFunction
{
    public string $name = '';
    /**
     * @var callable $function
     */
    public $function;
    private bool $isVariadic;
    private int $totalParamCount;
    private int $requiredParamCount;
    /**
     * CustomFunction constructor.
     *
     * @throws ReflectionException
     */
    public function __construct(string $name, callable $function)
    {
        $this->name = $name;
        $this->function = $function;
        $reflection = new ReflectionFunction($function);
        $this->isVariadic = $reflection->isVariadic();
        $this->totalParamCount = $reflection->getNumberOfParameters();
        $this->requiredParamCount = $reflection->getNumberOfRequiredParameters();
    }
    /**
     * @param array<Token> $stack
     *
     * @throws IncorrectNumberOfFunctionParametersException
     */
    public function execute(array &$stack, int $paramCountInStack): Token
    {
        if ($paramCountInStack < $this->requiredParamCount) {
            throw new IncorrectNumberOfFunctionParametersException($this->name);
        }
        if ($paramCountInStack > $this->totalParamCount && !$this->isVariadic) {
            throw new IncorrectNumberOfFunctionParametersException($this->name);
        }
        $args = [];
        if ($paramCountInStack > 0) {
            for ($i = 0; $i < $paramCountInStack; $i++) {
                \array_unshift($args, \array_pop($stack)->value);
            }
        }
        $result = \call_user_func_array($this->function, $args);
        return new Token(Token::Literal, $result);
    }
}
