<?php

namespace YakNet\AccessibilityConsole\Rules;

use DOMElement;
use YakNet\AccessibilityConsole\Core\Severity;
use YakNet\AccessibilityConsole\Core\Violation;
use YakNet\AccessibilityConsole\Core\WCAGStandard;

class ImageAltRedundant extends AbstractRule
{
    public function getId(): string { return 'WCAG_1_1_1_ALT_REDUNDANT'; }
    public function getDescription(): string { return 'Image alt text should not contain redundant words like "image" or "photo".'; }
    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
    public function getSeverity(): Severity { return Severity::WARNING; }

    /** @var array<int, string> */
    private array $redundantWords = [
        'resmi', 'görüntüsü', 'fotoğrafı', 'grafiği', 'logosu', 'ikonu',
        'image of', 'photo of', 'picture of', 'graphic of', 'logo of', 'icon of'
    ];

    public function check(DOMElement $element): ?Violation
    {
        if (strtolower($element->tagName) !== 'img') {
            return null;
        }

        if (!$element->hasAttribute('alt')) {
            return null;
        }

        $alt = trim($element->getAttribute('alt'));
        $cleanAlt = strtolower(preg_replace('/\s+/', ' ', $alt) ?? '');

        if ($cleanAlt === '') {
            return null;
        }

        foreach ($this->redundantWords as $word) {
            if (str_starts_with($cleanAlt, $word) || str_contains($cleanAlt, ' ' . $word)) {
                return $this->createViolation(
                    $element,
                    $this->getDescription(),
                    'Remove redundant phrases like "' . $word . '" from the alt text. Screen readers already announce elements as images.'
                );
            }
        }

        return null;
    }
}