add_action('wp_ajax_aquatics_filter_products', 'aquatics_filter_products');
add_action('wp_ajax_nopriv_aquatics_filter_products', 'aquatics_filter_products');

function aquatics_filter_products() {

    $state = isset($_POST['state']) ? json_decode(stripslashes($_POST['state']), true) : [];

    $default_category = sanitize_text_field($_POST['default_category'] ?? '');

    $args = [
        'post_type' => 'product',
        'posts_per_page' => 12,
        'post_status' => 'publish'
    ];

    // CATEGORY FILTER (Flexi Bar + Sidebar)
    if (!empty($state['categories'])) {
        $args['tax_query'][] = [
            'taxonomy' => 'product_cat',
            'field' => 'slug',
            'terms' => $state['categories']
        ];
    } elseif (!empty($default_category)) {
        $args['tax_query'][] = [
            'taxonomy' => 'product_cat',
            'field' => 'slug',
            'terms' => [$default_category]
        ];
    }

    // SEARCH
    if (!empty($state['query'])) {
        $args['s'] = sanitize_text_field($state['query']);
    }

    // PRICE FILTER
    if (!empty($state['price']['min']) || !empty($state['price']['max'])) {
        $price_query = ['relation' => 'AND'];

        if (!empty($state['price']['min'])) {
            $price_query[] = [
                'key' => '_price',
                'value' => floatval($state['price']['min']),
                'compare' => '>=',
                'type' => 'NUMERIC'
            ];
        }

        if (!empty($state['price']['max'])) {
            $price_query[] = [
                'key' => '_price',
                'value' => floatval($state['price']['max']),
                'compare' => '<=',
                'type' => 'NUMERIC'
            ];
        }

        $args['meta_query'][] = $price_query;
    }

    $query = new WP_Query($args);

    if (!$query->have_posts()) {
        echo '<div class="woocommerce-info">No products found.</div>';
        wp_die();
    }

    echo '<ul class="products columns-4">';

    while ($query->have_posts()) {
        $query->the_post();
        global $product;

        echo '<li class="product">';
        echo '<a href="' . get_permalink() . '">';
        echo woocommerce_get_product_thumbnail();
        echo '<h2 class="woocommerce-loop-product__title">' . get_the_title() . '</h2>';
        echo '</a>';
        echo '<span class="price">' . $product->get_price_html() . '</span>';
        echo '<a class="button" href="' . esc_url($product->add_to_cart_url()) . '">Add to cart</a>';
        echo '</li>';
    }

    echo '</ul>';

    wp_reset_postdata();
    wp_die();
}<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="https://purewaterdiagnostics.co.uk/sitemaps_xsl.xsl"?>
<sitemapindex xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/page-sitemap1.xml</loc>
<lastmod>2026-05-05T06:25:31+00:00</lastmod>
</sitemap>
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/category-sitemap1.xml</loc>
</sitemap>
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/post_tag-sitemap1.xml</loc>
</sitemap>
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/product_brand-sitemap1.xml</loc>
</sitemap>
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/product_cat-sitemap1.xml</loc>
</sitemap>
<sitemap>
<loc>https://purewaterdiagnostics.co.uk/product_tag-sitemap1.xml</loc>
</sitemap>
</sitemapindex>