function get_print_houses(
    $copies,
    $total_page_count,
    $book_size,
    $interior_print,
    $cover_print,
    $paper_weight_interior,
    $paper_weight_cover,
    $binding_method,
    $finishing_options,
    $delivery_country
) {
    // Normalization helper
    function normalize_input($value, $map) {
        if (empty($value)) {
            return null;
        }
        $value = strtolower(trim($value));
        foreach ($map as $canonical => $variants) {
            foreach ($variants as $variant) {
                if (strpos($value, strtolower($variant)) !== false) {
                    return $canonical;
                }
            }
        }
        return $value;
    }

    // Synonym maps
    $binding_method_map = [
        'Perfect bound' => ['perfect bound', 'softcover', 'soft cover'],
        'Thread sewn'   => ['thread sewn', 'hardcover', 'hard cover', 'sewn'],
        'Wire-o'        => ['wire-o', 'wire o', 'spiral', 'wiro']
    ];
    $finishing_map = [
        'Gloss lamination' => ['gloss', 'glossy', 'gloss lamination'],
        'Matt lamination'  => ['matte', 'matt', 'matt lamination'],
        'None'             => ['none', 'no finish', 'no lamination']
    ];
    $interior_print_map = [
        '1/1 black' => ['black and white', '1/1 black', 'greyscale', 'bw', 'b/w'],
        '4/4 color' => ['color', 'colour', '4/4 color', 'full color', 'colour interior']
    ];
    $cover_print_map = [
        '4/0 euro standard' => ['euro', '4/0 euro standard', '4/0'],
        '4/4 color'         => ['color cover', '4/4 color', 'full color cover']
    ];
    $interior_paper_map = [
        '135 gsm' => ['135 gsm', '135 gsm woodfree offset', 'woodfree offset 135'],
        '80 gsm'  => ['80 gsm', '80gsm offset', 'offset 80 gsm']
    ];
    $cover_paper_map = [
        '250 gsm' => ['250 gsm', '250gsm artboard', 'artboard 250', '250 gsm art board'],
        '300 gsm' => ['300 gsm', '300gsm board']
    ];

    // Normalize
    $binding_method = normalize_input($binding_method, $binding_method_map);
    $finishing_options = normalize_input($finishing_options, $finishing_map);
    $interior_print = normalize_input($interior_print, $interior_print_map);
    $cover_print = normalize_input($cover_print, $cover_print_map);
    $paper_weight_interior = normalize_input($paper_weight_interior, $interior_paper_map);
    $paper_weight_cover = normalize_input($paper_weight_cover, $cover_paper_map);

    // Load JSON
    $json_path = ABSPATH . 'wp-content/plugins/print-price-pro-corrected/includes/data/print-houses.json';
    if (!file_exists($json_path)) {
        return ['error' => 'Print houses data file not found.'];
    }
    $merged_houses = json_decode(file_get_contents($json_path), true);
    if (!$merged_houses) {
        return ['error' => 'Invalid print houses JSON data.'];
    }

    $all_houses = array_merge(
        $merged_houses['Calculation16'] ?? [],
        $merged_houses['Calculation32'] ?? []
    );

    $compatible = [];

    foreach ($all_houses as $ph) {
        if (
            empty($ph['Min Copies']) ||
            empty($ph['Max Copies']) ||
            $copies < intval($ph['Min Copies']) ||
            $copies > intval($ph['Max Copies'])
        ) {
            continue;
        }

        // Countries normalization
        $countries = [];
        if (isset($ph['Countries'])) {
            $countries = is_array($ph['Countries'])
                ? array_map('trim', $ph['Countries'])
                : array_map('trim', explode(',', $ph['Countries']));
        }
        if (!empty($delivery_country)) {
            $normalized_country = strtolower(trim($delivery_country));
            $found = false;
            foreach ($countries as $c) {
                if (strtolower(trim($c)) === $normalized_country) {
                    $found = true;
                    break;
                }
            }
            if (!$found) {
                continue;
            }
        }

        $criteria = [];

        if (!empty($binding_method) && !empty($ph['Binding Method']) && strcasecmp($binding_method, $ph['Binding Method']) === 0) {
            $criteria[] = 'binding';
        }
        if (!empty($interior_print) && !empty($ph['Interior Print']) && strcasecmp($interior_print, $ph['Interior Print']) === 0) {
            $criteria[] = 'interior_print';
        }
        if (!empty($cover_print) && !empty($ph['Cover Print']) && strcasecmp($cover_print, $ph['Cover Print']) === 0) {
            $criteria[] = 'cover_print';
        }
        if (!empty($finishing_options) && !empty($ph['Finishing Options']) && stripos($ph['Finishing Options'], $finishing_options) !== false) {
            $criteria[] = 'finishing';
        }
        if (!empty($paper_weight_interior) && !empty($ph['Interior Paper Weight']) && stripos($ph['Interior Paper Weight'], $paper_weight_interior) !== false) {
            $criteria[] = 'interior_paper';
        }
        if (!empty($paper_weight_cover) && !empty($ph['Cover Paper Weight']) && stripos($ph['Cover Paper Weight'], $paper_weight_cover) !== false) {
            $criteria[] = 'cover_paper';
        }

        // ✅ If at least binding OR any other criteria matched, consider it
        if (empty($criteria)) {
            continue;
        }

        $best_estimate = null;
        $best_diff = null;
        if (!empty($ph['Estimates']) && is_array($ph['Estimates'])) {
            foreach ($ph['Estimates'] as $e) {
                $e_copies = intval($e['Copies']);
                $diff = abs($e_copies - $copies);
                if ($best_diff === null || $diff < $best_diff) {
                    $best_diff = $diff;
                    $best_estimate = $e;
                }
            }
        }

        $compatible[] = [
            'print_house' => $ph['Print House'] ?? 'Unknown',
            'total_cost' => !empty($best_estimate['Estimated Cost']) ? floatval($best_estimate['Estimated Cost']) : 0,
            'estimated_delivery_time' => $ph['Estimated Delivery Time'] ?? '',
            'matched_criteria' => implode(', ', $criteria),
            'copies_used' => $best_estimate['Copies'] ?? null
        ];
    }

    // Fallback to cheapest option if still empty
    if (empty($compatible)) {
        usort($all_houses, fn($a, $b) => floatval($a['Estimates'][0]['Estimated Cost'] ?? 0) <=> floatval($b['Estimates'][0]['Estimated Cost'] ?? 0));
        $ph = $all_houses[0];
        $compatible[] = [
            'print_house' => $ph['Print House'] ?? 'Unknown',
            'total_cost' => !empty($ph['Estimates'][0]['Estimated Cost'])
                ? floatval($ph['Estimates'][0]['Estimated Cost'])
                : 0,
            'estimated_delivery_time' => $ph['Estimated Delivery Time'] ?? '',
            'note' => 'Fallback to cheapest available option'
        ];
    }

    usort($compatible, fn($a, $b) => $a['total_cost'] <=> $b['total_cost']);
    $selected = $compatible[0];

    return [
        'copies' => (int)$copies,
        'total_page_count' => (int)$total_page_count,
        'book_size' => $book_size,
        'interior_print' => $interior_print,
        'cover_print' => $cover_print,
        'paper_weight_interior' => $paper_weight_interior,
        'paper_weight_cover' => $paper_weight_cover,
        'binding_method' => $binding_method,
        'finishing_options' => $finishing_options,
        'delivery_country' => $delivery_country,
        'print_houses' => $compatible,
        'selected_print_house' => $selected
    ];
}
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://printprice.pro/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://printprice.pro/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-posts-print_order-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-taxonomies-post_tag-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://printprice.pro/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>