clean up prijs-per-postcode

.gitignore

@@ -0,0 +1 @@
+wp-pppr-salt.php

admin.php

@@ -0,0 +1,167 @@
+<?php
+
+function init_postode_admin()
+{
+    add_action("admin_menu", "local_postcodes_admin_menu", 99);
+    add_action("admin_head", "local_postcodes_admin_css");
+    add_action("admin_init", "local_postcodes_register_settings"); // Correct
+}
+
+function local_postcodes_admin_menu()
+{
+    add_submenu_page(
+        "woocommerce", // Parent menu slug
+        "Lokale Postcodes", // Page title
+        "Lokale Postcodes", // Menu title
+        "manage_options", // Capability
+        "local-postcodes", // Menu slug
+        "generate_admin_page", // Callback function
+        "dashicons-buddicons-pm", // Optional icon URL or dashicon
+    );
+}
+
+function local_postcodes_register_settings()
+{
+    register_setting(
+        "my_plugin_options",
+        "local_postcodes_values",
+        "local_postcodes_input_validate",
+    );
+}
+
+function generate_admin_page()
+{
+    ?>
+    <div class="wrap">
+        <h1><span class="dashicons dashicons-admin-home"></span> Lokale Postcodereeksen</h1>
+        <?php settings_errors("local_postcodes_error_messages"); ?>
+        <div class="info">
+        <p class="info">Vul hier de lokale postcodereeksen in.</p>
+        <ul>
+            <li>Het formaat voor een reeks is #### - #### (voorbeeld: 5000 - 5199).</li>
+            <li>Plaats één reeks op één regel.</li>
+            <li>Een reeks van 1 is geldig. (voorbeeld: 5000 - 5000).</li>
+            <li>Om een reeks te verwijderen. Wis de reeks en sla vervolgens de wijzigen op.</li>
+        </ul>
+        </div>
+        <form id="postcodes_form" method="post" action="options.php">
+            <?php
+            settings_fields("my_plugin_options");
+            do_settings_sections("my_plugin_options");
+            ?>
+            <textarea id="local_postcodes_values" name="local_postcodes_values"><?php echo esc_textarea(
+                get_option("local_postcodes_values"),
+            ); ?></textarea>
+            <?php submit_button(); ?>
+        </form>
+    </div>
+    <?php
+}
+
+function local_postcodes_admin_css()
+{
+    ?>
+    <style>
+        h1 .dashicons{
+            font-size: 25px;
+
+        }
+
+        .info {
+            font-size: 1.1rem;
+            max-width: 60ch;
+
+            ul {
+                list-style: square inside;
+            }
+        }
+
+        #postcodes_form {
+            display: flex;
+            flex-direction: column;
+            max-width: 60ch;
+            align-items: flex-end;
+            font-size: 1.1rem;
+
+            #local_postcodes_values{
+                width: 100% !important;
+                height: 50vh !important;
+                font-size: 1.1rem;
+                font-family: "Consolas", "Monaco", "Courier New", monospace;
+            }
+
+
+            .submit{
+                margin-top: .2rem;
+            }
+        }
+    </style>';
+    <?php
+}
+
+function local_postcodes_input_validate($input)
+{
+    $valid_input = "";
+    $lines = preg_split("/\R/", $input, -1, PREG_SPLIT_NO_EMPTY);
+    $pattern = '/^\d{4}\s*\-\s*\d{4}$/';
+    $pc_arr = [];
+
+    foreach ($lines as $line) {
+        $line = trim($line);
+        if (preg_match($pattern, $line)) {
+            $parts = explode("-", $line);
+            $first = (int) $parts[0];
+            $second = (int) $parts[1];
+
+            if ($first <= $second) {
+                $pc_arr[] = [$first, $second];
+            } else {
+                $pc_arr[] = [$second, $first];
+            }
+        } else {
+            add_settings_error(
+                "local_postcodes_error_messages",
+                "invalid_postcode_" . md5($line),
+                '❌️ Ongeldige regel: "' .
+                    esc_html($line) .
+                    '". Gebruik het formaat #### - ####.(bijvoorbeeld: 5000 - 5199)',
+                "error",
+            );
+        }
+    }
+
+    usort($pc_arr, function ($a, $b) {
+        return $a[0] <=> $b[0];
+    });
+
+    $old_pc_arr_len = count($pc_arr);
+    $pc_arr = array_map(
+        "unserialize",
+        array_unique(array_map("serialize", $pc_arr)),
+    );
+    $new_pc_arr_len = count($pc_arr);
+
+    if ($new_pc_arr_len < $old_pc_arr_len) {
+        add_settings_error(
+            "local_postcodes_error_messages",
+            "Duplicaten",
+            // @formatter:off
+            "⚠️ " .
+                $old_pc_arr_len -
+                $new_pc_arr_len .
+                " " .
+                ($old_pc_arr_len - $new_pc_arr_len > 1
+                    ? "duplicaten"
+                    : "duplicaat") .
+                " verwijderd.",
+            // @formatter:on
+            "warning",
+        );
+    }
+
+    foreach ($pc_arr as $range) {
+        $valid_input .= $range[0] . " - " . $range[1] . "\n";
+    }
+
+    return $valid_input;
+}

assets/postcode_modal.css

@@ -1,70 +1,127 @@
 .postcode_modal {
-    border-radius: 20px;
-    box-shadow(10px);
+    border-radius: 3px;
     border: none;
-    max-width: 80ch;
-    box-shadow: 0 0 20pc black;
+    max-width: 65ch;
     padding: 2rem;
+    padding-bottom: 1rem;
     opacity: 0;
-    transition: opacity 0.3s ease, display 0.3s allow-discrete;
+    transition:
+        opacity 0.3s ease,
+        display 0.3s allow-discrete;
 
     &[open] {
         opacity: 1;
         transition-behavior: allow-discrete;
-      transition: opacity 0.3s ease, display 0.3s allow-discrete;
+        transition:
+            opacity 0.3s ease,
+            display 0.3s allow-discrete;
+        @starting-style {
+            opacity: 0;
+        }
+    }
+
+    h2 {
+        font-size: 1.1rem;
+        font-weight: 700;
+    }
+
+    p {
+        font-size: 1rem;
     }
 
     &:not([open]) {
         display: none;
     }
 
-    h2 {
-      font-size: 1.5rem;
-      margin: .6rem;
+    form {
+        margin-top: 1rem;
     }
 
     input[type="text"] {
-        padding: .3rem;
-        font-size: 1.4rem;
-        caret-color: hsl(344 98 40);
+        padding: 0.3rem;
+        font-size: 1.2rem;
+        caret-color: var(--wp--preset--color--vivid-red);
+        background: hsl(0 1 80);
+        border: none;
+        text-transform: uppercase;
+
+        &:focus,
+        &:valid,
+        &:invalid,
+        &:autofill,
+        &:autofill:focus {
+            background: hsl(0 1 80) !important;
+        }
     }
 
-    button {
-        border: none;
-        font-size: 1.4rem;
+    #postcode_modal_submit {
+        display: grid;
+        grid-template-columns: 1fr;
+        grid-template-rows: 1fr;
+        place-items: center;
+        font-size: 1.2rem;
+        font-weight: 700;
         color: hsl(233 100 100);
-        padding: .4rem 1rem;
-        border-radius: 5px;
-        background: hsl(344 98 40);
-        border: 1px hsl(344 98 40) solid;
-        margin: 0 0 0 .3rem;
-        transition: .2s all linear;
-
+        padding: 0.4rem 1rem;
+        background: var(--wp--preset--color--vivid-red);
+        border: 1px var(--wp--preset--color--vivid-red) solid;
+        transition: 0.2s all linear;
+        padding: 0.2em 2.5em;
         &:hover {
-            color: hsl(344 98 40 );
+            color: var(--wp--preset--color--vivid-red);
             background: hsl(344 98 100);
             cursor: pointer;
         }
+
+        &:hover > .btn_loader > svg > circle {
+            fill: var(--wp--preset--color--vivid-red);
         }
 
+        .btn_loader,
+        .btn_text {
+            transition: 0.2s opacity linear;
+            grid-row: 1 / -1;
+            grid-column: 1 / -1;
+        }
+    }
     .form_fields {
         display: flex;
-        justify-content: space-between;
+        justify-content: center;
         align-items: center;
-
-        &>{
-            display: flex;
-        }
+        gap: 0.5rem;
     }
 
     &::backdrop {
-        backdrop-filter: blur(1px);
-        background-color: hsl(40deg 100 0 /0.4);
-        background: radial-gradient(circle,rgba(33, 33, 33, 0.68) 0%, rgba(15, 15, 15, 0.8) 23%, rgba(0, 0, 0, 0.87) 100%);
+        backdrop-filter: blur(2px);
+        background: hsl(0 1 65 / 0.6);
     }
 
     .error_message_modal_postcode {
         min-height: 1lh;
-        color: hsl(344 98 40 );
+        color: var(--wp--preset--color--vivid-red);
     } /* HTML: <div class="loader"></div> */
 }
+
+/* HTML: <div class="loader"></div> */
+.btn_loader {
+    opacity: 0;
+    svg {
+        height: 0.4rem;
+    }
+    circle {
+        fill: white;
+        transition: 0.2s fill linear;
+        animation: loader-pulse 1.5s ease-in-out infinite;
+        animation-delay: calc((var(--i, 0)) * 0.2s);
+    }
+}
+
+@keyframes loader-pulse {
+    0%,
+    100% {
+        opacity: 0.3; /* Dim state */
+    }
+    50% {
+        opacity: 1; /* Bright state */
+    }
+}

pppr_cookie.php

@@ -0,0 +1,175 @@
+<?php
+
+function create_pppr_salt() {
+   // 1. Check permissions first (Optional but recommended)
+    if ( ! wp_is_writable( plugin_dir_path( __FILE__ ) ) ) {
+        // Log error or handle failure
+        return false;
+    }
+
+    // 2. Define path INSIDE the plugin folder
+    $file_path = plugin_dir_path( __FILE__ ) . 'wp-pppr-salt.php';
+    
+    // 3. Get the salt
+    $current_salt = wp_salt( 'auth' );
+
+    if ( empty( $current_salt ) ) {
+        return false;
+    }
+
+    // 4. Prepare content
+    $file_content = "<?php\n";
+    $file_content .= "// Auto-generated salt constant\n";
+    $file_content .= "// Exported salt from " . date( 'Y-m-d H:i:s' ) . "\n";
+    $file_content .= "define( 'WP_PPPR_SALT', '{$current_salt}' );\n";
+
+    // 5. Write the file
+    $bytes_written = file_put_contents( $file_path, $file_content, LOCK_EX );
+
+    // 6. Verify success
+    if ( $bytes_written === false ) {
+        // Handle error (e.g., log it)
+        return false;
+    }
+    
+    return true;
+}
+
+function set_pppr_cookie($is_local, $street_name, $house_number, $postcode, $city) {
+    $data_string = (int)$is_local . "|" . $street_name . "|" . $house_number . "|" . $postcode . "|" . $city;
+    $signature = hash_hmac('sha256', $data_string, WP_PPPR_SALT);
+    $cookie_value = $data_string . "|" . $signature;
+
+    $cookie_domain = $_SERVER['SERVER_NAME'];
+    $is_secure = is_ssl(); 
+
+    setcookie("PPPR", $cookie_value, [
+        'expires' => time() + 7200,
+        'path' => '/',
+        'domain' => $cookie_domain,
+        'secure' => $is_secure, 
+        'httponly' => true, // Prevent JavaScript access
+        'samesite' => 'Lax' // Protect against CSRF
+    ]);
+}   
+
+function unset_pppr_cookie( $path = '/') {
+    unset($_COOKIE["PPPR"]);
+
+    $domain = $_SERVER['SERVER_NAME'];
+    $is_secure = is_ssl();
+
+    // 3. Send the delete command with ALL matching parameters
+    setcookie(
+        "PPPR", 
+        '', 
+        time() - 3600, 
+        '/', 
+        $domain, 
+        $is_secure, // Critical: Must match the 'secure' flag used when setting
+        true        
+    );
+}
+
+function update_expire_pppr_cookie() {
+    if (!isset($_COOKIE['PPPR'])) {
+        return false;
+    }
+ 
+    $cookie_value = $_COOKIE['PPPR'];
+    $cookie_domain = $_SERVER['SERVER_NAME'];
+    $is_secure = is_ssl(); 
+
+    setcookie("PPPR", $cookie_value, [
+        'expires' => time() + 7200,
+        'path' => '/',
+        'domain' => $cookie_domain,
+        'secure' => $is_secure,
+        'httponly' => true, // Prevent JavaScript access
+        'samesite' => 'Lax' // Protect against CSRF
+    ]);
+}
+
+function verify_pppr_cookie_string() {
+    if (!isset($_COOKIE['PPPR'])) {
+        return false;
+    }
+
+    $cookie_value = $_COOKIE['PPPR'];
+
+    $last_delimiter = strrpos($cookie_value, '|');
+    if ($last_delimiter === false) {
+        return false;
+    }
+
+    $data_part = substr($cookie_value, 0, $last_delimiter);
+    $hash_part = substr($cookie_value, $last_delimiter + 1);
+
+    // Check if salt is defined
+    if (!defined('WP_PPPR_SALT')) {
+        return false;
+    }
+
+    $expected_hash = hash_hmac('sha256', $data_part, WP_PPPR_SALT);
+
+    return hash_equals($expected_hash, $hash_part);
+}   
+
+function get_PPPR_data() {
+    // 1. Check if cookie exists
+    if (!isset($_COOKIE['PPPR'])) {
+        return false;
+    }
+
+    $cookie_value = $_COOKIE['PPPR'];
+
+    // 2. Split safely using the LAST delimiter (handles pipes in street names)
+    $last_delimiter = strrpos($cookie_value, '|');
+    if ($last_delimiter === false) {
+        return false; // Malformed cookie
+    }
+
+    $data_part = substr($cookie_value, 0, $last_delimiter);
+    $provided_hash = substr($cookie_value, $last_delimiter + 1);
+
+    // 3. CRITICAL: Verify the signature before trusting ANY data
+    // Ensure WP_PPPR_SALT is defined and matches the setter exactly
+    if (!defined('WP_PPPR_SALT')) {
+        return false; 
+    }
+
+    $expected_hash = hash_hmac('sha256', $data_part, WP_PPPR_SALT);
+
+    if (!hash_equals($expected_hash, $provided_hash)) {
+        return false; // Tampered or invalid cookie
+    }
+
+    // 4. Only now is it safe to explode the verified data
+    $fields = explode('|', $data_part);
+    
+    // Ensure we have enough fields
+    if (count($fields) < 5) {
+        return false;
+    }
+
+    return [
+        'is_local'     => (bool)$fields[0],
+        'street'       => $fields[1],
+        'house_number' => $fields[2],
+        'postcode'     => $fields[3],
+        'city'         => $fields[4],
+    ];
+}
+
+function pppr_is_local() {
+    // Check if the cookie exists and is not empty
+    if (isset($_COOKIE['PPPR']) && !empty($_COOKIE['PPPR'])) {
+        // Ensure it's treated as a string before accessing the first character
+        $cookie_value = (string) $_COOKIE['PPPR'];
+        $first_char = $cookie_value[0] ?? '';
+        return $first_char === '1';
+    }
+    
+    // Return false if cookie is missing or empty
+    return false;
+}

prijs-per-postcode.php

@@ -1,65 +1,70 @@
 <?php
 
-session_start();
-require_once "session_dialog.php";
 /*
- * Plugin Name: prijzen per poscode range
- * Description:  posctcodes in de 5000-5800 range krijgen een lokaal tarief aangeboden.
+ * Plugin Name: Prijs per poscodeereeks.
+ * Description: Producten worden gefiltered aan de hand van opgegegeven postcodereeksen.Gebruikers met een postcode die in een opgegegeven postcodereeks valt zal een lokale prijs zien. Waar elke gebruiker met een postcode die buiten eem opgegeven reeks valt zal de reguliere prijs te zien krijgen. 
  * Author: Remo Zaros
- * Version: 0.9.1
+ * Version: 0.9.090
  * Text Domeain: prijs-per-postcode
  */
 
+require_once plugin_dir_path(__FILE__) . "session_dialog.php";
+require_once plugin_dir_path(__FILE__) . "admin.php";
+require_once plugin_dir_path(__FILE__) . "pppr_cookie.php";
+
+
 if (!defined("ABSPATH")) {
     echo "big bag of potatoes";
     exit();
 }
 
-class PrijsPerPostcode
-{
-    public function __construct()
-    {
-        add_action("init", [$this, "init"]);
-        add_action("rest_api_init", "register_modal_api");
+/*
+ * Create salt 
+ */
+register_activation_hook( __FILE__, 'create_pppr_salt' );
+if ( ! defined( 'WP_PPPR_SALT' ) ) {
+    $salt_file = __DIR__ . '/wp-pppr-salt.php'; 
+    if ( file_exists( $salt_file ) ) {
+        require_once $salt_file;
+    }else {
+      define("WP_PPPR_SALT", wp_salt( 'auth' ));
+  }
 }
 
-    public function init()
-    {
-        $uri = $_SERVER["REQUEST_URI"];
+
 add_filter("woocommerce_sale_flash", "__return_null");
+add_filter('woocommerce_show_variation_price', '__return_true');   
+
+
+/*
+ * Init the plugin
+ */
+add_action("init", function() {
+    $uri = $_SERVER["REQUEST_URI"];
     init_postcode_handlers($uri);
-
-        //add_action("template_redirect", [$this, "redirect_if_missing_tag"]);
-        add_action(
-            "woocommerce_variation_options_pricing",
-            [$this, "add_local_price_field"],
-            10,
-            3,
+    // set the admin page
+    init_postode_admin();
+  }, 1
 );
-        add_action(
-            "woocommerce_save_product_variation",
-            [$this, "save_local_price_field"],
-            10,
-            2,
-        );
-        add_action("woocommerce_before_calculate_totals", [
-            $this,
-            "use_local_price_if_local_postcode",
-        ]);
 
-        add_filter(
-            "woocommerce_get_price_html",
-            [$this, "display_local_price_on_product"],
-            10,
-            2,
-        );
-        add_action("template_redirect", [
-            $this,
-            "controleer_postcode_op_woocommerce_paginas",
-        ]);
-    }
 
-    public function add_local_price_field($loop, $variation_data, $variation)
+/*
+ *  Set endpoint (postcode-modal/v1/submit) for the modal form.
+ */
+add_action("rest_api_init", function () {
+    register_rest_route( 'postcode-modal/v1', '/submit', array(
+        'methods'             => 'POST',
+        'callback'            => 'handle_postcode_modal',
+        'permission_callback' => '__return_true',
+    ) );
+});
+
+
+/* 
+ * Add local orice field to variation product.
+ */
+add_action("woocommerce_variation_options_pricing", 
+    function($loop, $variation_data, $variation)
     {
         woocommerce_wp_text_input([
             "id" => "_local_price[" . $loop . "]",
@@ -72,9 +77,15 @@ class PrijsPerPostcode
             "data_type" => "price",
             "wrapper_class" => "form-row form-row-first", // Left half
         ]);
-    }
+    }, 10, 3,
+);
 
-    public function save_local_price_field($variation_id, $i)
+
+/*
+ * Save the local price on product save in the admin
+ */
+add_action("woocommerce_save_product_variation",
+    function ($variation_id, $i)
     {
         $local_price = $_POST["_local_price"][$i];
         if (isset($local_price)) {
@@ -84,38 +95,131 @@ class PrijsPerPostcode
                 wc_clean($local_price),
             );
         }
+    }, 10, 2,
+);
+
+
+/* 
+ * Replace "Reguliere prijs" with "Prijs overige regios" 
+ * in variation prodict admin
+ */
+add_filter( "gettext", function( $translated_text, $text, $domain,) {
+        if (
+            "woocommerce" === $domain &&
+            is_admin() &&
+            isset($_REQUEST["action"]) &&
+            "woocommerce_load_variations" === $_REQUEST["action"]
+        ) {
+            if ($translated_text === "Reguliere prijs (%s)") {
+                $translated_text = "Prijs overige regios (%s)";
+            }
+        }
+        return $translated_text;
+    }, 99, 3,
+);
+
+
+/* 
+ * Filter out variations whwre the price is 
+ * either 0 or '' in the dropdown menu product page
+ */
+add_filter("woocommerce_variation_is_visible",
+    function (
+        $visible,
+        $variation_id,
+        $parent_id,
+        $variation,
+    ) {
+        // Ensure $variation is a valid object
+        if (!$variation instanceof WC_Product_Variation) {
+            $variation = wc_get_product($variation_id);
         }
 
-    public function use_local_price_if_local_postcode($cart)
+        if (!$variation) {
+            return false;
+        }
+
+        $price = pppr_is_local()
+            ? $variation->get_meta("_local_price", true)
+            : $variation->get_regular_price();
+
+        if (empty($price) || floatval($price) == 0) {
+            return false;
+        }
+
+        return $visible;
+    }, 10, 4,
+);
+
+
+/* 
+ * Dynamically recalculates the cart total by overriding the standard price 
+ * with a region-specific _local_price for variations when 
+ * the user's location matches the PPPR cookie criteria 
+ */
+add_action("woocommerce_before_calculate_totals", function($cart)
     {
         if (is_admin() && !defined("DOING_AJAX")) {
             return;
         }
 
-        foreach ($cart->get_cart() as $cart_item) {
+        foreach ($cart->get_cart() as $cart_item) 
+        {
             $product = $cart_item["data"];
             $variation_id = $product->is_type("variation")
                 ? $product->get_id()
                 : 0;
 
-            if (
-                $variation_id &&
-                isset($_SESSION["postcode_is_local"]) &&
-                $_SESSION["postcode_is_local"]
-            ) {
+            if ( $variation_id && isset($_COOKIE["PPPR"]) && pppr_is_local() ) 
+            {
                 $local_price = get_post_meta(
                     $variation_id,
                     "_local_price",
                     true,
                 );
-                if ($local_price) {
+
+                if ($local_price) 
+                {
                     $product->set_price($local_price);
                 }
             }
         }
     }
+);
 
-    public function controleer_postcode_op_woocommerce_paginas()
+
+/* 
+ * Filter to display the regular or local price on teh product page. 
+ */
+add_filter( "woocommerce_get_price_html",
+    function($price_html, $product)
+    {
+        if (
+            $product->is_type("variation") &&
+            isset($_COOKIE["PPPR"]) &&
+            pppr_is_local()
+        ) {
+            $local_price = get_post_meta(
+                $product->get_id(),
+                "_local_price",
+                true,
+            );
+            if ($local_price !== "") {
+                return wc_price($local_price);
+            }
+        }
+        return $price_html;
+    }, 10, 2,
+);
+
+
+/* 
+ * Enforces region-locking by clearing the cart and redirecting users to 
+ * the shop page if their location cookie is invalid or expired when 
+ * accessing key WooCommerce pages. 
+ */
+add_action("template_redirect",
+    function ()
     {
         if (is_admin() || defined("DOING_AJAX")) {
             return;
@@ -130,31 +234,59 @@ class PrijsPerPostcode
              is_account_page()) &&
             !is_shop()
         ) {
-            if (!isset($_SESSION["postcode_is_local"])) {
-                wp_redirect(home_url("/winkel/"));
+            if (!verify_pppr_cookie_string()) {
+              if (!WC()->cart->is_empty()) {
+                WC()->cart->empty_cart();
+             }
+              wp_safe_redirect(get_shop_url());
               exit();
+            }else{
+              update_expire_pppr_cookie();
             }
         }
     }
-
-    public function display_local_price_on_product($price_html, $product)
-    {
-        if (
-            $product->is_type("variation") &&
-            isset($_SESSION["postcode_is_local"]) &&
-            $_SESSION["postcode_is_local"] === true
-        ) {
-            $local_price = get_post_meta(
-                $product->get_id(),
-                "_local_price",
-                true,
 );
-            if ($local_price !== "") {
-                return wc_price($local_price);
-            }
-        }
-        return $price_html;
-    }
+
+
+/* 
+ * Chack or postcode is still valid when pressing the buy button 
+ */
+add_action( 'woocommerce_after_checkout_validation', function( $data, $errors ) {
+    // 1. Controleer of de cookie bestaat en geldig is
+    if ( ! isset( $_COOKIE['PPPR'] ) || ! verify_pppr_cookie_string() ) {
+        $errors->add( 
+            'pppr_cookie_invalid', 
+            __( '<strong>Fout:</strong> Sessie verlopen. Vernieuw de pagina en vul je postcode opnieuw in.', 'woocommerce' ) 
+        );
+        return; // Stop hier, geen zin om verder te checken
     }
 
-new PrijsPerPostcode();
+    $pppr_data = get_PPPR_data();
+
+    if ( ! $pppr_data || empty( $pppr_data['postcode'] ) ) {
+        $errors->add( 
+            'pppr_data_missing', 
+            __( '<strong>Fout:</strong> Kon postcode niet laden.', 'woocommerce' ) 
+        );
+        return;
+    }
+
+    // 3. Normalizeer postcodes (gebruik de juiste variabelen!)
+    $cookie_pc   = strtoupper( str_replace( ' ', '', $pppr_data['postcode'] ) );
+    $shipping_pc = strtoupper( str_replace( ' ', '', $data['shipping_postcode'] ) );
+
+    // 4. Vergelijk
+    if ( $cookie_pc !== $shipping_pc ) {
+        wc_add_notice( 
+            __( '<strong>Fout:</strong> Afleverpostcode komt niet overeen met de eerder ingevulde postcode.', 'woocommerce' ), 
+            'error' 
+        );
+    }
+}, 10, 2 );
+
+
+function get_shop_url () {
+  return  (function_exists('wcml_get_store_url')) 
+    ? wcml_get_store_url() // WPML WooCommerce Multilingual
+    : get_permalink(wc_get_page_id('shop')); // Fallback
+}

session_dialog.php

@@ -1,12 +1,11 @@
 <?php
 
-session_start();
 function init_postcode_handlers($uri)
 {
   if (strpos($uri, "/winkel/") !== false) {
     add_action("wp_enqueue_scripts", "modal_styles");
     add_action("wp_footer", "send_postcode_data");
-        if (!has_postcode()) {
+    if (!verify_pppr_cookie_string()) {
       if (!is_admin()) {
         WC()->cart->empty_cart();
             }
@@ -25,121 +24,163 @@ function modal_styles()
   wp_enqueue_style(
     "prijs-per-postcode",
     plugins_url("/assets/postcode_modal.css", __FILE__),
+    [], // Voeg een lege dependencies array toe (verplicht)
+    filemtime(plugin_dir_path(__FILE__) . "assets/postcode_modal.css"), // Voeg versie toe
     );
 }
 
 function show_modal()
 {
-    ?>
-    <script id="postcode_modal">
+  echo <<<'HTML'
+    <script id="postcode_modal_open">
       const postcodeModal = document.querySelector("#postcode_modal");
       postcodeModal.showModal();
     </script>
-    <?php
+HTML;
 }
 
 function send_postcode_data()
 {
-    ?>
+  $URL = get_rest_url(null, "postcode-modal/v1/submit");
+  $nonce = wp_create_nonce("wp_rest");
+
+  echo <<<HTML
     <script type="module">
         const postcodeModal = document.querySelector("#postcode_modal");
         const modalForm = document.querySelector("#postcode_modal_form");
+        const sndBtn = document.querySelector("#postcode_modal_submit");
+        const sndBtnLdr = sndBtn.querySelector(".btn_loader");
+        const sndBtnTxt = sndBtn.querySelector(".btn_text");
+        const errorMsg = document.querySelector("#error_message_modal_postcode");
 
-        modalForm.addEventListener('submit', async (e) => {
-            e.preventDefault();
-            const formData = new FormData(e.target);
-            const data = Object.fromEntries(formData.entries());
-            const json = JSON.stringify(data);
-
-            try {
-              const resp = await fetch('<?php echo get_rest_url(
-                  null,
-                  "postcode-modal/v1/submit",
-              ); ?>', {
-                method: 'POST',
-                credentials: 'same-origin',
-                headers: {
-                  'Content-Type': 'application/json',
-                  'X-WP-Nonce': '<?php echo wp_create_nonce("wp_rest"); ?>'
-                },
-                body: json
+        // 1. Validatie bij blur (client-side checks)
+        modalForm.querySelectorAll("input").forEach(input => {
+            input.addEventListener("blur", ev => {
+                errorMsg.innerHTML = "";
+                if (!ev.target.validity.valid && ev.target.value !== "") {
+                    errorMsg.innerHTML = ev.target.title;
+                }
+            });
+        });
+
+        // 2. Submit Handler
+        modalForm.addEventListener('submit', async (e) => {
+            e.preventDefault();
+            errorMsg.innerHTML = "";
+
+            // UI: Laadstatus
+            sndBtn.disabled = true;
+            sndBtnLdr.style.opacity = "1";
+            sndBtnTxt.style.opacity = "0";
+
+            const formData = new FormData(e.target);
+            const payload = Object.fromEntries(formData.entries());
+
+            try {
+                const resp = await fetch('{$URL}', {
+                    method: 'POST',
+                    credentials: 'same-origin',
+
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-WP-Nonce': '{$nonce}'
+                    },
+                    body: JSON.stringify(payload)
                 });
 
-              if(!resp.ok){
-                throw new Error(`HTTP Error! status: ${resp.status}` );
-              }
                 const data = await resp.json();
-              console.log("Data returnd", data);
+
+                sndBtn.disabled = false;
+                sndBtnLdr.style.opacity = "0";
+                sndBtnTxt.style.opacity = "1";
 
                 if (data.status === "error") {
-                  const err = data.message;
-                  let errmsg
+                    const errorCode = data.code; // Komt nu correct door vanuit PHP
+                    const apiMessage = data.message;
 
-                  switch (err) {
-                    case "Huisnummer not found":
-                      errmsg = "Adres niet gevonden.";
-                      break;
-                    case "Multiple addresses match this huisnummer; add huisletter and/or huisnummertoevoeging":
-                      errmsg = "Huisnummertovoeging mist.";
-                      break;
-                    default:
-                      errmsg = "Gegevens niet correct.";
+                    let userErrorMessage = "Gegevens zijn niet correct.";
+
+                    // Specifieke foutafhandeling
+                    if (errorCode === "HUISNUMMER_NOT_FOUND" || apiMessage.includes("not found")) {
+                        userErrorMessage = "Adres is niet gevonden.";
                     }
-                  document.querySelector("#error_message_modal_postcode").innerHTML = errmsg;
+                    else if (errorCode === "HUISNUMMER_AMBIGUOUS") {
+                        const suggestions = data.suggestions || [];
+                        if (suggestions.length > 0) { 
+                          userErrorMessage = `Meerdere opties: \${suggestions.join(", ")}. Voeg een toevoeging toe.`;
+                        } else {
+                          userErrorMessage = "Huisnummertoevoeging is verplicht.";
+                        }
+                    }
+                    else if (errorCode === "CURL_ERROR" || errorCode === "JSON_ERROR") {
+                        userErrorMessage = "Serverfout. Probeer het later opnieuw.";
+                    }
+
+                    errorMsg.innerHTML = userErrorMessage;
                 }
 
                 if (data.status === "success") {
+                    // Succes: Modal sluiten en eventueel reload of update
                     postcodeModal.close();
-                //location.reload();
+                    // Optioneel: location.reload(); of update de pagina content
                 }
+
             } catch (err) {
-              console.error("Fetch Failed:", err);
-              throw err;
+                sndBtn.disabled = false;
+                sndBtnLdr.style.opacity = "0";
+                sndBtnTxt.style.opacity = "1";
+                errorMsg.innerHTML = "Er ging iets mis bij het verbinden.";
             }
         });
     </script>
-    <?php
+HTML;
 }
 
 function render_dialog_html()
 {
-    ?>
+  echo <<<'HTML'
     <dialog id="postcode_modal" class="postcode_modal" closedby="none">
         <h2>Vul je postcode en huisnummer in.</h2>
-        <form id="postcode_modal_form" method="post" action="" novalidation>
+        <p>Onze prijzen zijn afhankelijk van de regio. Vul daarom de postcode en het huisnummer in om de exacte prijzen te bekijken.</p>
+        <form id="postcode_modal_form" method="post" action="" novalidate>
             <div class="form_fields">
-                <div>
-                    <input type="text" name="postcode"
-                        title="Voer een geldige Nederlandse postcode in (bijv. 1234AB of 1234 AB)."
+                    <!-- Dutch Postcode Field -->
+                    <input
+                        type="text"
+                        name="postcode"
+                        title="Voer een geldige postcode in (bijv. 1234AB of 1234 AB)."
                         pattern="[1-9][0-9]{3} ?(?!sa|sd|ss)[a-zA-Z]{2}"
-                        placeholder= "1010 AA"
-                        size="10"
+                        placeholder="5010 AA"
+                        size="8"
                         required
+                        autocomplete="off"
                     />
 
-                    <input type="text" name="huisnummer"
-                        pattern="/\d+([-\\s]?[a-zA-Z]+)?/"
-                        title="Voer een geldig huisnummer in (bijv. 1, 1A, 1-A, 1a)."
-                        placeholder= "12A"
-                        size="5"
+                    <!-- House Number Field -->
+                    <input
+                        type="text"
+                        name="huisnummer"
+                        title="Voer een geldig huisnummer in (bijv. 1, 1A, 1-A)."
+                        pattern="\d+([\- ]?[a-zA-Z]+)?"
+                        placeholder="10"
+                        size="3"
                         required
+                        autocomplete="off"
                     />
+                    <button id="postcode_modal_submit" type="submit"><span class="btn_text">OK</span>
+                        <div class="btn_loader">
+                            <svg viewBox="0 0 128 30" xmlns="http://www.w3.org/2000/svg">
+                                <circle style="--i:0" cx="14" cy="15" r="14" />
+                                <circle style="--i:1" cx="64" cy="15" r="14" />
+                                <circle style="--i:2" cx="114" cy="15" r="14" />
+                            </svg>
                         </div>
-                <button id="postcode_modal_submit" type="submit">verzend</button>
+                    </button>
                 </div>
         </form>
         <div class="error_message_modal_postcode" id="error_message_modal_postcode" aria-live="polite"></div>
-        <div class="loader_modal"></div>
     </dialog>
-    <?php
-}
-
-function has_postcode()
-{
-    if (isset($_SESSION["postcode"])) {
-        return true;
-    }
-    return false;
+    HTML; 
 }
 
 function handle_postcode_modal($data)
@@ -147,73 +188,95 @@ function handle_postcode_modal($data)
     $params = $data->get_params();
     $nonce = $data->get_header("X-WP-Nonce");
 
-    if (wp_verify_nonce($nonce, "wp_rest")) {
+    // 1. Security
+    if (!wp_verify_nonce($nonce, "wp_rest")) {
+        echo json_encode(["status" => "error", "message" => "nononce"]);
+        exit();
+    }
+
+    // 2. Basis Validatie
     if (!verify_postcode($params["postcode"])) {
-            $resp = [
-                "status" => "error",
-                "message" => "postcode",
-            ];
-            echo json_encode($resp);
+        echo json_encode(["status" => "error", "message" => "postcode"]);
         exit();
     }
-
     if (!verify_huisnummer($params["huisnummer"])) {
-            $resp = [
-                "status" => "error",
-                "message" => "huisnummer",
-            ];
-            echo json_encode($resp);
+        echo json_encode(["status" => "error", "message" => "huisnummer"]);
         exit();
     }
 
+    // 3. API Call (Ruwe data)
     $result = getStraatnaam($params["postcode"], $params["huisnummer"]);
-        if (isset($result["error"])) {
-            $resp = [
-                "status" => "error",
-                "message" => $result["error"],
-                "apirequest" => "openpostcode.nl",
-            ];
-            echo json_encode($resp);
-            exit();
+
+    // 4. Validatie & Logic
+    $hasError = isset($result["error"]);
+    $errorCode = null;
+    $errorMessage = null;
+    $candidates = [];
+    $straatnaam = null;
+    $woonplaats = null;
+
+    if ($hasError) {
+        $errorCode = $result["error"]["code"] ?? "UNKNOWN_ERROR";
+        $errorMessage = $result["error"]["message"] ?? "Onbekende fout";
+        $candidates = $result["error"]["details"]["candidates"] ?? [];
+
+        // SPECIAL CASE: HUISNUMMER_AMBIGUOUS
+        if ($errorCode === "HUISNUMMER_AMBIGUOUS" && !empty($candidates)) {
+            $plainMatch = null;
+
+            // Zoek naar candidate ZONDER toevoeging
+            foreach ($candidates as $candidate) {
+                if (
+                    empty($candidate["huisletter"]) &&
+                    empty($candidate["huisnummertoevoeging"])
+                ) {
+                    $plainMatch = $candidate;
+                    break;
+                }
             }
 
-        $_SESSION["postcode"] = $params["postcode"];
-        $_SESSION["huisnummer"] = $params["huisnummer"];
-        $_SESSION["straatnaam"] = $result["straatnaam"];
-        $_SESSION["woonplaats"] = $result["woonplaats"];
+            // Als we een 'platte' match hebben (bijv. 15), dan is het SUCCES
+            if ($plainMatch) {
+                $hasError = false; // Negeer de error
+                $straatnaam = $plainMatch["straat"];
+                $woonplaats = $plainMatch["woonplaats"];
+            }
+        }
+    } else {
+        // Normaal succes (geen error in response)
+        if (!empty($result["results"])) {
+            $straatnaam = $result["results"][0]["straat"];
+            $woonplaats = $result["results"][0]["woonplaats"];
+        } else {
+            // Edge case: geen error veld, maar ook geen results
+            $hasError = true;
+            $errorCode = "NO_RESULTS";
+            $errorMessage = "Adres niet gevonden";
+        }
+    }
 
-        $_SESSION["postcode_is_local"] = postcode_in_range(
-            $params["postcode"],
-            5000,
-            5800,
+    // 5. Response sturen
+    if ($hasError) {
+         return new WP_REST_Response([
+          "status" => "error",
+          "code" => $errorCode,
+          "message" => $errorMessage,
+          "suggestions" => $result["error"]["details"]["suggestions"] ?? [],
+          "apirequest" => "openpostcode.nl",
+      ], 400);
+    }
+    set_pppr_cookie(
+      postcode_in_range($params["postcode"]), 
+      trim($straatnaam), 
+      trim($params["huisnummer"]), 
+      trim($params["postcode"]), 
+      trim($woonplaats)
     );
 
-        $resp = [
+    return new WP_REST_Response([
       "status" => "success",
       "message" => "all good",
-            "straatnaam" => $result["straatnaam"],
-            "lokaal_trarief" => postcode_in_range(
-                $params["postcode"],
-                5000,
-                5800,
-            ),
-        ];
-    } else {
-        $resp = [
-            "status" => "error",
-            "message" => "nononce",
-        ];
-    }
-    echo json_encode($resp);
-    exit();
-}
-
-function register_modal_api()
-{
-    register_rest_route("postcode-modal/v1", "submit", [
-        "methods" => "POST",
-        "callback" => "handle_postcode_modal",
-    ]);
+    ], 200);
 }
 
 function verify_postcode($postcode)
@@ -247,31 +310,45 @@ function getStraatnaam($postcode, $huisnummer)
     curl_setopt($ch, CURLOPT_USERAGENT, "PHP/OpenPostcodeClient");
 
     $response = curl_exec($ch);
+    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 
     if (curl_error($ch)) {
         curl_close($ch);
-        return ["error" => "cURL error: " . curl_error($ch)];
+        return [
+            "error" => ["code" => "CURL_ERROR", "message" => curl_error($ch)],
+        ];
     }
 
     curl_close($ch);
 
+    // Decodeer als associatieve array (true)
     $data = json_decode($response, true);
 
-    if (isset($data["error"])) {
+    // Als JSON decode faalt
+    if (json_last_error() !== JSON_ERROR_NONE) {
         return [
-            "error" => $data["error"]["message"],
-            "code" => $data["error"]["code"],
+            "error" => [
+                "code" => "JSON_ERROR",
+                "message" => "Invalid JSON response",
+            ],
         ];
     }
 
-    return [
-        "straatnaam" => $data["results"][0]["straat"],
-        "woonplaats" => $data["results"][0]["woonplaats"],
-    ];
+    // Give me back RUWE data (inclusive meta, error, results, etc.)
+    return $data;
 }
 
-function postcode_in_range($postcode, $start, $end)
+function postcode_in_range($postcode)
 {
+    $vals = get_option("local_postcodes_values", "");
+    $rows = preg_split("/\R/", $vals, -1, PREG_SPLIT_NO_EMPTY);
+    $pc_arr = [];
+
+    foreach ($rows as $row) {
+        $row = trim($row);
+        $postcode_range = explode("-", $row);
+        $pc_arr[] = [(int) $postcode_range[0], (int) $postcode_range[1]];
+    }
     $cleanPostcode = strtoupper(preg_replace("/\s+/", "", $postcode));
 
     if (!preg_match('/^\d{4}[A-Z]{2}$/', $cleanPostcode)) {
@@ -280,81 +357,166 @@ function postcode_in_range($postcode, $start, $end)
 
     $numberPart = (int) substr($cleanPostcode, 0, 4);
 
-    return $numberPart >= $start && $numberPart <= $end;
+    foreach ($pc_arr as $pc_to_check) {
+        if ($numberPart >= $pc_to_check[0] && $numberPart <= $pc_to_check[1]) {
+            return true;
+        }
+    }
+    return false;
 }
 
-function modify_checkout_with_js()
-{
-    if (
-        !is_checkout() ||
-        (is_wc_endpoint_url() && !is_wc_endpoint_url("order-received"))
-    ) {
+function modify_checkout_with_js() {
+    if ( ! is_checkout() || ( is_wc_endpoint_url() && ! is_wc_endpoint_url( 'order-received' ) ) ) {
         return;
     }
 
-    $woonplaats = $_SESSION["woonplaats"];
-    $postcode = $formatted_postcode = preg_replace(
-        "/(\d+)([A-Z]+)/",
-        '$1 $2',
-        strtoupper($_SESSION["postcode"]),
-    );
-    $address =
-        $_SESSION["straatnaam"] . " " . strtoupper($_SESSION["huisnummer"]);
-    // Output the JavaScript
-    ?>
-        <script type="text/javascript" id="fill_address_fields">
-          jQuery(document).ready(function($) {
-              fillCheckoutFields();
-              $(document.body).on('updated_checkout', fillCheckoutFields);
+    $data = get_PPPR_data();
+    if ( empty( $data ) ) {
+        return;
+    }
+
+    $city = esc_js( $data['city'] );
+    $postcode = esc_js( preg_replace( '/(\d+)([A-Z]+)/', '$1 $2', strtoupper( $data['postcode'])));
+    $address = esc_js( $data['street'] . ' ' . strtoupper( $data['house_number']));
+
+    // Enqueue script properly to handle dependencies and nonces
+    wp_enqueue_script( 'jquery' );
+    wp_localize_script( 'jquery', 'ajax_object', array(
+        'ajax_url' => admin_url( 'admin-ajax.php' ),
+        'nonce'    => wp_create_nonce( 'unset_my_session_nonce' )
+    ) );
+
+    echo <<<HTML
+    <script type="text/javascript" id="set_pppr_fields">
+    document.addEventListener('DOMContentLoaded', function() {
+        
+        // Safari Fix: Handle back/forward cache (bfcache)
+        window.addEventListener('pageshow', function(event) {
+            if (event.persisted || (typeof wp !== 'undefined' && wp.data)) {
+                initPPPRFields();
+            }
         });
 
-          function fillCheckoutFields() {
-            if (typeof wp !== 'undefined' && wp.data && wp.data.dispatch) {
-              const store = 'wc/store/cart';
-
-              wp.data.dispatch(store).setShippingAddress({
-                  first_name: '',
-                  last_name: '',
-                  address_1: '<?php echo esc_js($address); ?>',
-                  address_2: '',
-                  city: '<?php echo esc_js($woonplaats); ?>',
-                  state: '',
-                  postcode: '<?php echo esc_js($postcode); ?>',
-                  country: 'NL',
-                  phone: '',
-                  email: ''
-              });
-
-              //make fields READONLY and ppstcode reset.
+        function initPPPRFields() {
+            // Wait for React/WC Blocks to mount
             setTimeout(() => {
-                // make prefilled fiields readonly.
-                $('#shipping-postcode, #shipping-city, #shipping-address_1')
-                  .prop('readonly', true)
-                  .css('background', '#f9f9f9');
+                const addressVal = '{$address}';
+                const cityVal = '{$city}';
+                const postcodeVal = '{$postcode}';
+
+                // Map WC Blocks field selectors
+                const fields = [
+                    { id: 'shipping-address_1', val: addressVal },
+                    { id: 'shipping-city', val: cityVal },
+                    { id: 'shipping-postcode', val: postcodeVal }
+                ];
+
+                fields.forEach(field => {
+                    // 1. Try Redux Dispatch (Standard)
+                    if (typeof wp !== 'undefined' && wp.data && wp.data.dispatch) {
+                        try {
+                            wp.data.dispatch('wc/store/cart').setShippingAddress({ [field.id.replace('shipping-', '')]: field.val });
+                        } catch(e) { console.warn('Redux update skipped', e); }
+                    }
+
+                    // 2. Force DOM Update (Safari Fallback)
+                    // Select both legacy and Blocks inputs
+                    const inputs = document.querySelectorAll('#' + field.id + ', input[name="' + field.id.replace('shipping-', '') + '"]');
+                    
+                    inputs.forEach(input => {
+                        if (input.value !== field.val) {
+                            input.value = field.val;
+                            
+                            // CRITICAL FOR SAFARI: Manually trigger events so React notices
+                            ['input', 'change'].forEach(evtType => {
+                                input.dispatchEvent(new Event(evtType, { bubbles: true, cancelable: true }));
+                            });
+                        }
+                        
+                        // 3. Apply Visual Lock
+                        input.setAttribute('data-pppr-locked', 'true');
+                        input.readOnly = true; 
+                    });
+                });
+
+                // Inject Reset Button once
+                if (!document.querySelector('.postcode-reset')) {
+                    const cityContainer = document.querySelector('.wc-block-components-address-form__city');
+                    if (cityContainer) {
+                        const div = document.createElement('div');
+                        div.className = 'postcode-reset';
+                        div.style.display = 'block';
+                        div.style.width = '100%';
+                        div.style.marginTop = '10px';
 
-                  // create postcode reset button
-                  const div = document.createElement("div");
-                  const script = document.createElement('script');
-                  div.setAttribute("class", "postcode-reset")
                         div.innerHTML = `
-                    <a href="#" class="reset-postcode-show-comfirm" >Reset postcode.</a>
-                    <span class="bevestiging"> Weet je het zeker?
-                      <a href="#" class="accept">ja</a>/<a href="#" class="decline">nee</a>
-                      (Deze handeling leegt de winkelwagen.)
+                            <a href="#" class="reset-postcode-show-comfirm" style="font-size:12px; text-decoration:underline; display:block; margin-top:5px;">Reset postcode.</a>
+                            <span class="bevestiging" style="display:none; font-size:12px; margin-top:5px;"> 
+                                Deze handeling leegt ook de winkelwagen. Weet je het zeker?
+                                <a href="#" class="accept" style="color:red; font-weight:bold;">&nbsp;&nbsp;JA&nbsp;</a>/
+                                <a href="#" class="decline">&nbsp;nee&nbsp;&nbsp;</a>
                             </span>`;
-                  div.style.width = "100%";
-                  document.querySelector(".wc-block-components-address-form__city").after(div);
-              }, 500);
+                        cityContainer.parentNode.insertBefore(div, cityContainer.nextSibling);
 
-
-
-              jQuery(document.body).trigger('update_checkout');
-          } else {
-              console.error('WooCommerce Blocks API is niet beschikbaar');
+                        // Event Listeners (using delegation for safety)
+                        div.addEventListener('click', function(e) {
+                            e.preventDefault();
+                            if (e.target.classList.contains('reset-postcode-show-comfirm')) {
+                                e.target.style.display = 'none';
+                                div.querySelector('.bevestiging').style.display = 'block';
+                            } else if (e.target.classList.contains('decline')) {
+                                div.querySelector('.bevestiging').style.display = 'none';
+                                div.querySelector('.reset-postcode-show-comfirm').style.display = 'block';
+                            } else if (e.target.classList.contains('accept')) {
+                                fetch(ajax_object.ajax_url, {
+                                    method: 'POST',
+                                    headers: {
+                                        'Content-Type': 'application/x-www-form-urlencoded',
+                                    },
+                                    body: new URLSearchParams({
+                                        action: 'unset_my_session',
+                                        nonce: ajax_object.nonce
+                                    })
+                                })
+                                .then(res => res.json())
+                                .then(res => {
+                                    if (res.success) location.reload();
+                                    else alert('Failed to reset: ' + (res.data || 'Unknown error'));
+                                })
+                                .catch(err => console.error('AJAX error:', err));
+                            }
+                        });
                     }
                 }
+
+                // Add CSS for locked state dynamically
+                if (!document.getElementById('pppr-styles')) {
+                    const style = document.createElement('style');
+                    style.id = 'pppr-styles';
+                    style.textContent = `
+                        input[data-pppr-locked="true"] {
+                            background-color: #f9f9f9 !important;
+                            cursor: not-allowed !important;
+                            pointer-events: none !important;
+                            opacity: 0.7;
+                        }
+                    `;
+                    document.head.appendChild(style);
+                }
+
+            }, 600); // Delay for WC Blocks hydration
+        }
+
+        // Initialize on load
+        initPPPRFields();
+
+        // Re-apply if checkout updates (e.g. shipping method change)
+        document.body.addEventListener('updated_checkout', function() {
+            setTimeout(initPPPRFields, 400);
+        });
+    });
     </script>
-     <?php
+HTML;
 }
 
 function load_assets_reset_postcode_on_checkout()
@@ -383,17 +545,14 @@ function load_assets_reset_postcode_on_checkout()
     }
 }
 
+
 function handle_unset_session_fetch()
 {
   // Verify the nonce for security
   if (!wp_verify_nonce($_POST["nonce"], "reset_postcode_nonce")) {
     wp_die("Security check failed.");
     }
-
-    // Unset the specific session variable
-    if (isset($_SESSION["postcode"])) {
-        $_SESSION = [];
-    }
+    unset_pppr_cookie();
 
     // Send a JSON response
     wp_send_json_success();