roi-theme/Public/AdsensePlacement/Infrastructure/Services/ContentAdInjector.php

<?php
declare(strict_types=1);

namespace ROITheme\Public\AdsensePlacement\Infrastructure\Services;

use ROITheme\Public\AdsensePlacement\Infrastructure\Ui\AdsensePlacementRenderer;

/**
 * Inyecta anuncios dentro del contenido del post
 * via filtro the_content
 */
final class ContentAdInjector
{
    public function __construct(
        private array $settings,
        private AdsensePlacementRenderer $renderer
    ) {}

    /**
     * Filtra the_content para insertar anuncios
     */
    public function inject(string $content): string
    {
        if (!($this->settings['behavior']['post_content_enabled'] ?? false)) {
            return $content;
        }

        // Verificar longitud minima
        $minLength = (int)($this->settings['forms']['min_content_length'] ?? 500);
        if (strlen(strip_tags($content)) < $minLength) {
            return $content;
        }

        $afterParagraphs = (int)($this->settings['behavior']['post_content_after_paragraphs'] ?? 3);
        $maxAds = (int)($this->settings['behavior']['post_content_max_ads'] ?? 2);

        // Dividir contenido en parrafos
        $paragraphs = explode('</p>', $content);
        $totalParagraphs = count($paragraphs);

        if ($totalParagraphs < $afterParagraphs + 1) {
            return $content;
        }

        $adsInserted = 0;
        $newContent = '';

        foreach ($paragraphs as $index => $paragraph) {
            $newContent .= $paragraph;

            if ($index < $totalParagraphs - 1) {
                $newContent .= '</p>';
            }

            $paragraphNumber = $index + 1;

            // Primer anuncio despues del parrafo indicado
            if ($paragraphNumber === $afterParagraphs && $adsInserted < $maxAds) {
                $newContent .= $this->renderer->renderSlot($this->settings, 'post-content-' . ($adsInserted + 1));
                $adsInserted++;
            }

            // Segundo anuncio a mitad del contenido restante
            $midPoint = $afterParagraphs + (int)(($totalParagraphs - $afterParagraphs) / 2);
            if ($paragraphNumber === $midPoint && $adsInserted < $maxAds && $maxAds > 1) {
                $newContent .= $this->renderer->renderSlot($this->settings, 'post-content-' . ($adsInserted + 1));
                $adsInserted++;
            }
        }

        return $newContent;
    }
}