/**
 * Replacement for the product FAQ FluentSnippet.
 * Keeps the existing questions_reponses meta and FAQPage JSON-LD output.
 */

add_filter( 'woocommerce_structured_data_product', function ( $markup, $product ) {
    if ( is_a( $product, 'WC_Product' ) ) {
        $markup['@id'] = get_permalink( $product->get_id() ) . '#product';
    }

    return $markup;
}, 10, 2 );

add_shortcode( 'faq_schema', 'fs_product_faq_schema_shortcode' );

if ( ! function_exists( 'fs_product_faq_schema_shortcode' ) ) {
function fs_product_faq_schema_shortcode( $atts ) {
    if ( ! function_exists( 'is_product' ) || ! is_product() ) {
        return '';
    }

    global $post;

    $items = get_post_meta( $post->ID, 'questions_reponses', true );

    if ( empty( $items ) || ! is_array( $items ) ) {
        return '<p><em>Es gibt derzeit keine weiteren Kundenfragen.</em></p>';
    }

    $css = '<style>'
        . '.product-faq{width:100%!important;max-width:100%!important;min-width:100%!important;margin:20px 0;box-sizing:border-box!important;display:block!important;position:relative;overflow:hidden}'
        . '.faq-item{border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;overflow:hidden;background:#fff;box-shadow:0 2px 4px rgba(0,0,0,.1);width:100%!important;max-width:100%!important;min-width:100%!important;box-sizing:border-box!important;display:block!important;position:relative}'
        . '.faq-question{margin:0;padding:0}.faq-question button{appearance:none;border:0;background:#f8f9fa;padding:20px;cursor:pointer;display:flex!important;justify-content:space-between;align-items:center;gap:16px;width:100%;box-sizing:border-box;color:inherit;font:inherit;font-weight:600;text-align:left}'
        . '.faq-question button:hover,.faq-question button:focus-visible{background:#f0f2f4}.faq-question button:focus-visible{outline:3px solid #1b7184;outline-offset:-3px}.faq-icon{flex:0 0 auto;font-size:22px;line-height:1}.faq-answer{padding:20px;background:#fff}.faq-answer[hidden]{display:none!important}.faq-answer-content>:first-child{margin-top:0}.faq-answer-content>:last-child{margin-bottom:0}'
        . '</style>';

    $js = '<script>document.addEventListener("DOMContentLoaded",function(){document.querySelectorAll(".product-faq").forEach(function(faq){faq.querySelectorAll(".faq-question button").forEach(function(button){var panel=document.getElementById(button.getAttribute("aria-controls"));var item=button.closest(".faq-item");if(!panel||!item){return}function setState(open){button.setAttribute("aria-expanded",open?"true":"false");item.classList.toggle("active",open);panel.hidden=!open;var icon=button.querySelector(".faq-icon");if(icon){icon.textContent=open?"−":"+"}}setState(button.getAttribute("aria-expanded")==="true");button.addEventListener("click",function(){setState(button.getAttribute("aria-expanded")!=="true")})})})});</script>';

    $schema = array(
        '@context'    => 'https://schema.org',
        '@type'       => 'FAQPage',
        'mainEntity'  => array(),
    );
    $html       = $css . '<div class="product-faq">';
    $valid_index = 0;

    foreach ( $items as $item ) {
        $question = isset( $item['questions'] ) ? trim( wp_strip_all_tags( $item['questions'] ) ) : '';
        $answer   = isset( $item['reponses'] ) ? trim( $item['reponses'] ) : '';

        if ( '' === $question || '' === $answer ) {
            continue;
        }

        $answer_html = wpautop( wp_kses_post( $answer ) );
        $is_open     = 0 === $valid_index;
        $button_id   = 'product-faq-button-' . $post->ID . '-' . $valid_index;
        $panel_id    = 'product-faq-panel-' . $post->ID . '-' . $valid_index;

        $html .= '<div class="faq-item' . ( $is_open ? ' active' : '' ) . '">';
        $html .= '<h3 class="faq-question">';
        $html .= '<button type="button" id="' . esc_attr( $button_id ) . '" aria-expanded="' . ( $is_open ? 'true' : 'false' ) . '" aria-controls="' . esc_attr( $panel_id ) . '">';
        $html .= '<span>' . esc_html( $question ) . '</span>';
        $html .= '<span class="faq-icon" aria-hidden="true">' . ( $is_open ? '&minus;' : '+' ) . '</span>';
        $html .= '</button></h3>';
        $html .= '<div id="' . esc_attr( $panel_id ) . '" class="faq-answer" role="region" aria-labelledby="' . esc_attr( $button_id ) . '"' . ( $is_open ? '' : ' hidden' ) . '>';
        $html .= '<div class="faq-answer-content">' . $answer_html . '</div></div></div>';

        $schema['mainEntity'][] = array(
            '@type'          => 'Question',
            'name'           => $question,
            'acceptedAnswer' => array(
                '@type' => 'Answer',
                'text'  => trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( $answer_html ) ) ),
            ),
        );

        $valid_index++;
    }

    $html .= '</div>' . $js;

    if ( empty( $schema['mainEntity'] ) ) {
        return $html . '<p><em>Es gibt derzeit keine weiteren Kundenfragen.</em></p>';
    }

    return $html . "\n<script type=\"application/ld+json\">\n" . wp_json_encode( $schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT ) . "\n</script>";
}
}