/**
 * WooCommerce Customizations
 * Version: 1.2 (Mandatory WhatsApp Validation)
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * Change the default "Sale!" text to "SALE"
 */
add_filter('woocommerce_sale_flash', 'tdb_custom_sale_flash');
function tdb_custom_sale_flash($html)
{
    return '<span class="onsale">SALE</span>';
}

/**
 * Handle custom redirect parameter for Buy Now functionality
 */
add_action('template_redirect', 'tdb_custom_add_to_cart_redirect');
function tdb_custom_add_to_cart_redirect()
{
    if (!isset($_REQUEST['add-to-cart']) || !isset($_REQUEST['redirect'])) return;
    if ($_REQUEST['redirect'] !== 'checkout') return;
    if (!function_exists('wc_get_checkout_url') || !function_exists('WC')) return;
    wp_safe_redirect(wc_get_checkout_url());
    exit;
}

/**
 * Remove default WC breadcrumbs (we use custom tdb_breadcrumbs in footer)
 */
remove_action('woocommerce_before_main_content', 'woocommerce_breadcrumb', 20);

/**
 * Related Products: Filter by Category & EXCLUDE Credits
 */
add_filter('woocommerce_related_products', 'tdb_filter_related_products_by_category', 10, 3);
function tdb_filter_related_products_by_category($related_posts, $product_id, $args)
{
    $terms = wp_get_post_terms($product_id, 'product_cat');
    if (empty($terms)) return $related_posts;

    $term_ids = wp_list_pluck($terms, 'term_id');

    $query_args = array(
        'post_type' => 'product',
        'post_status' => 'publish',
        'posts_per_page' => 4,
        'post__not_in' => array($product_id),
        'tax_query' => array(
            'relation' => 'AND',
            array(
                'taxonomy' => 'product_cat',
                'field' => 'term_id',
                'terms' => $term_ids,
                'operator' => 'IN'
            ),
            array(
                'taxonomy' => 'product_cat',
                'field' => 'slug',
                'terms' => array('credits'),
                'operator' => 'NOT IN'
            )
        ),
        'fields' => 'ids'
    );

    return get_posts($query_args);
}

/**
 * Performance: Dequeue unnecessary WC assets on non-essential pages
 * (But keeping CSS for layout safety)
 */
add_action('wp_enqueue_scripts', 'tdb_dequeue_woocommerce_assets', 99);
function tdb_dequeue_woocommerce_assets() {
    if (function_exists('is_woocommerce') && !is_woocommerce() && !is_cart() && !is_checkout() && !is_account_page()) {
        wp_dequeue_script('wc-add-to-cart');
        wp_dequeue_script('wc-cart-fragments');
    }
}

/**
 * Checkout & Profile Fields
 */
function tdb_custom_checkout_fields($fields) {
    if (isset($fields['billing']['billing_phone'])) {
        $fields['billing']['billing_phone']['required'] = true;
        $fields['billing']['billing_phone']['label'] = 'WhatsApp Number';
        $fields['billing']['billing_phone']['priority'] = 120; 
    }
    unset($fields['billing']['billing_company']);
    unset($fields['billing']['billing_address_1']);
    unset($fields['billing']['billing_address_2']);
    unset($fields['billing']['billing_city']);
    unset($fields['billing']['billing_state']);
    return $fields;
}
add_filter('woocommerce_checkout_fields', 'tdb_custom_checkout_fields');

/**
 * Checkout: Validate Phone Number (WhatsApp)
 */
function tdb_validate_checkout_phone() {
    $phone = isset($_POST['billing_phone']) ? sanitize_text_field($_POST['billing_phone']) : '';
    
    // Remove spaces and dashes for checking
    $clean_phone = preg_replace('/[\s\-]/', '', $phone);

    // Check if empty
    if (empty($clean_phone)) {
        wc_add_notice(__('Please enter your WhatsApp number.', 'woocommerce'), 'error');
        return;
    }

    // Check for International Prefix (+ or 00)
    if (strpos($clean_phone, '+') !== 0 && strpos($clean_phone, '00') !== 0) {
        wc_add_notice(__('Please enter your WhatsApp number with the country code (e.g., +44 7123...).', 'woocommerce'), 'error');
        return;
    }

    // Check Length (Min 7 digits excluding prefix)
    $digits_only = preg_replace('/^(\+|00)/', '', $clean_phone);
    $digits_only = preg_replace('/[^0-9]/', '', $digits_only);

    if (strlen($digits_only) < 7 || strlen($digits_only) > 15) {
        wc_add_notice(__('Please enter a valid phone number length (7-15 digits).', 'woocommerce'), 'error');
    }
}
add_action('woocommerce_checkout_process', 'tdb_validate_checkout_phone');

/**
 * My Account: Save WhatsApp Number
 */
function tdb_save_account_whatsapp_number( $user_id ) {
    if ( isset( $_POST['billing_phone'] ) ) {
        $phone = sanitize_text_field( $_POST['billing_phone'] );
        update_user_meta( $user_id, 'billing_phone', $phone );
    }
}
add_action( 'woocommerce_save_account_details', 'tdb_save_account_whatsapp_number', 10, 1 );

/**
 * My Account: Validate WhatsApp Number
 */
function tdb_validate_account_whatsapp_number_field( $errors ) {
    if ( isset( $_POST['billing_phone'] ) ) {
        $phone = preg_replace('/[^0-9]/', '', $_POST['billing_phone']);
        if ( strlen( $phone ) < 7 ) {
            $errors->add( 'billing_phone_error', __( 'Please enter a valid WhatsApp number (at least 7 digits).', 'woocommerce' ) );
        }
    }
}
add_action( 'woocommerce_save_account_details_errors', 'tdb_validate_account_whatsapp_number_field', 10, 1 );
<!DOCTYPE html>
<html lang="en-US">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<meta name='robots' content='max-image-preview:large, noindex, follow' />
	<title>Security Alert</title>
	<style type="text/css">
		html {
			background: #f1f1f1;
		}
		body {
			background: #fff;
			border: 1px solid #ccd0d4;
			color: #444;
			font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
			margin: 2em auto;
			padding: 1em 2em;
			max-width: 700px;
			-webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
			box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
		}
		h1 {
			border-bottom: 1px solid #dadada;
			clear: both;
			color: #666;
			font-size: 24px;
			margin: 30px 0 0 0;
			padding: 0;
			padding-bottom: 7px;
		}
		#error-page {
			margin-top: 50px;
		}
		#error-page p,
		#error-page .wp-die-message {
			font-size: 14px;
			line-height: 1.5;
			margin: 25px 0 20px;
		}
		#error-page code {
			font-family: Consolas, Monaco, monospace;
		}
		ul li {
			margin-bottom: 10px;
			font-size: 14px ;
		}
		a {
			color: #2271b1;
		}
		a:hover,
		a:active {
			color: #135e96;
		}
		a:focus {
			color: #043959;
			box-shadow: 0 0 0 2px #2271b1;
			outline: 2px solid transparent;
		}
		.button {
			background: #f3f5f6;
			border: 1px solid #016087;
			color: #016087;
			display: inline-block;
			text-decoration: none;
			font-size: 13px;
			line-height: 2;
			height: 28px;
			margin: 0;
			padding: 0 10px 1px;
			cursor: pointer;
			-webkit-border-radius: 3px;
			-webkit-appearance: none;
			border-radius: 3px;
			white-space: nowrap;
			-webkit-box-sizing: border-box;
			-moz-box-sizing:    border-box;
			box-sizing:         border-box;

			vertical-align: top;
		}

		.button.button-large {
			line-height: 2.30769231;
			min-height: 32px;
			padding: 0 12px;
		}

		.button:hover,
		.button:focus {
			background: #f1f1f1;
		}

		.button:focus {
			background: #f3f5f6;
			border-color: #007cba;
			-webkit-box-shadow: 0 0 0 1px #007cba;
			box-shadow: 0 0 0 1px #007cba;
			color: #016087;
			outline: 2px solid transparent;
			outline-offset: 0;
		}

		.button:active {
			background: #f3f5f6;
			border-color: #7e8993;
			-webkit-box-shadow: none;
			box-shadow: none;
		}

			</style>
</head>
<body id="error-page">
	<div class="wp-die-message"><h1>Access Denied</h1><p>Your IP has been flagged for suspicious activity.</p></div></body>
</html>