<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Extra\Html;

use Symfony\Component\Mime\MimeTypes;
use Twig\Error\RuntimeError;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;
use Twig\TwigFunction;

final class HtmlExtension extends AbstractExtension
{
    private $mimeTypes;

    public function __construct(?MimeTypes $mimeTypes = null)
    {
        $this->mimeTypes = $mimeTypes;
    }

    public function getFilters(): array
    {
        return [
            new TwigFilter('data_uri', [$this, 'dataUri']),
        ];
    }

    public function getFunctions(): array
    {
        return [
            new TwigFunction('html_classes', [self::class, 'htmlClasses']),
        ];
    }

    /**
     * Creates a data URI (RFC 2397).
     *
     * Length validation is not performed on purpose, validation should
     * be done before calling this filter.
     *
     * @return string The generated data URI
     *
     * @internal
     */
    public function dataUri(string $data, ?string $mime = null, array $parameters = []): string
    {
        $repr = 'data:';

        if (null === $mime) {
            if (null === $this->mimeTypes) {
                $this->mimeTypes = new MimeTypes();
            }

            $tmp = tempnam(sys_get_temp_dir(), 'mime');
            file_put_contents($tmp, $data);
            try {
                if (null === $mime = $this->mimeTypes->guessMimeType($tmp)) {
                    $mime = 'text/plain';
                }
            } finally {
                @unlink($tmp);
            }
        }
        $repr .= $mime;

        foreach ($parameters as $key => $value) {
            $repr .= ';'.$key.'='.rawurlencode($value);
        }

        if (0 === strpos($mime, 'text/')) {
            $repr .= ','.rawurlencode($data);
        } else {
            $repr .= ';base64,'.base64_encode($data);
        }

        return $repr;
    }

    /**
     * @internal
     */
    public static function htmlClasses(...$args): string
    {
        $classes = [];
        foreach ($args as $i => $arg) {
            if (\is_string($arg)) {
                $classes[] = $arg;
            } elseif (\is_array($arg)) {
                foreach ($arg as $class => $condition) {
                    if (!\is_string($class)) {
                        throw new RuntimeError(\sprintf('The html_classes function argument %d (key %d) should be a string, got "%s".', $i, $class, \gettype($class)));
                    }
                    if (!$condition) {
                        continue;
                    }
                    $classes[] = $class;
                }
            } else {
                throw new RuntimeError(\sprintf('The html_classes function argument %d should be either a string or an array, got "%s".', $i, \gettype($arg)));
            }
        }

        return implode(' ', array_unique(array_filter($classes, static function ($v) { return '' !== $v; })));
    }
}
