<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;
use function is_array, is_object, is_string;


/**
 * PHP callable tools.
 */
final class Callback
{
    use Nette\StaticClass;

    /**
     * Invokes internal PHP function with own error handler.
     */
    public static function invokeSafe(string $function, array $args, callable $onError): mixed
    {
        $prev = set_error_handler(function ($severity, $message, $file) use ($onError, &$prev, $function): ?bool {
            if ($file === __FILE__) {
                $msg = ini_get('html_errors')
                    ? Html::htmlToText($message)
                    : $message;
                $msg = preg_replace("#^$function\\(.*?\\): #", '', $msg);
                if ($onError($msg, $severity) !== false) {
                    return null;
                }
            }

            return $prev ? $prev(...func_get_args()) : false;
        });

        try {
            return $function(...$args);
        } finally {
            restore_error_handler();
        }
    }


    /**
     * Checks that $callable is valid PHP callback. Otherwise throws exception. If the $syntax is set to true, only verifies
     * that $callable has a valid structure to be used as a callback, but does not verify if the class or method actually exists.
     * @return callable
     * @throws Nette\InvalidArgumentException
     */
    public static function check(mixed $callable, bool $syntax = false)
    {
        if (!is_callable($callable, $syntax)) {
            throw new Nette\InvalidArgumentException(
                $syntax
                ? 'Given value is not a callable type.'
                : sprintf("Callback '%s' is not callable.", self::toString($callable)),
            );
        }

        return $callable;
    }


    /**
     * Converts PHP callback to textual form. Class or method may not exists.
     */
    public static function toString(mixed $callable): string
    {
        if ($callable instanceof \Closure) {
            $inner = self::unwrap($callable);
            return '{closure' . ($inner instanceof \Closure ? '}' : ' ' . self::toString($inner) . '}');
        } else {
            is_callable(is_object($callable) ? [$callable, '__invoke'] : $callable, true, $textual);
            return $textual;
        }
    }


    /**
     * Returns reflection for method or function used in PHP callback.
     * @param  callable  $callable  type check is escalated to ReflectionException
     * @throws \ReflectionException  if callback is not valid
     */
    public static function toReflection($callable): \ReflectionMethod|\ReflectionFunction
    {
        if ($callable instanceof \Closure) {
            $callable = self::unwrap($callable);
        }

        if (is_string($callable) && str_contains($callable, '::')) {
            return new ReflectionMethod(...explode('::', $callable, 2));
        } elseif (is_array($callable)) {
            return new ReflectionMethod($callable[0], $callable[1]);
        } elseif (is_object($callable) && !$callable instanceof \Closure) {
            return new ReflectionMethod($callable, '__invoke');
        } else {
            return new \ReflectionFunction($callable);
        }
    }


    /**
     * Checks whether PHP callback is function or static method.
     */
    public static function isStatic(callable $callable): bool
    {
        return is_string(is_array($callable) ? $callable[0] : $callable);
    }


    /**
     * Unwraps closure created by Closure::fromCallable().
     */
    public static function unwrap(\Closure $closure): callable|array
    {
        $r = new \ReflectionFunction($closure);
        $class = $r->getClosureScopeClass()?->name;
        if (str_ends_with($r->name, '}')) {
            return $closure;

        } elseif (($obj = $r->getClosureThis()) && $obj::class === $class) {
            return [$obj, $r->name];

        } elseif ($class) {
            return [$class, $r->name];

        } else {
            return $r->name;
        }
    }
}

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