include admin page, bump version number

admin.php

@@ -0,0 +1,142 @@
+<?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>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;
+            }
+
+
+            .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($line) .
+                    '". Gebruik het formaat #### | ####.(bijvoorbeeld: 5000 | 5199)',
+                "error",
+            );
+        }
+    }
+
+    // Sorteer de VOLLEDIGE array NA de foreach-lus
+    usort($pc_arr, function ($a, $b) {
+        return $a[0] <=> $b[0];
+    });
+
+    // Bouw $valid_input op uit de gesorteerde $pc_arr
+    foreach ($pc_arr as $range) {
+        $valid_input .= $range[0] . " | " . $range[1] . "\n";
+    }
+
+    return $valid_input;
+}

prijs-per-postcode.php

@@ -1,11 +1,12 @@
 <?php
 
 require_once plugin_dir_path(__FILE__) . "session_dialog.php";
+require_once plugin_dir_path(__FILE__) . "admin.php";
 /*
  * Plugin Name: prijzen per poscode range
  * Description:  posctcodes in de 5000-5800 range krijgen een lokaal tarief aangeboden.
  * Author: Remo Zaros
- * Version: 0.9.3
+ * Version: 0.9.4
  * Text Domeain: prijs-per-postcode
  */
 
@@ -30,6 +31,8 @@ class PrijsPerPostcode
         }
         $uri = $_SERVER["REQUEST_URI"];
         init_postcode_handlers($uri);
+        init_postode_admin();
+
         add_filter("woocommerce_sale_flash", "__return_null");
 
         //add_action("template_redirect", [$this, "redirect_if_missing_tag"]);

session_dialog.php

@@ -116,7 +116,7 @@ function render_dialog_html()
                         name="postcode"
                         title="Voer een geldige Nederlandse postcode in (bijv. 1234AB of 1234 AB)."
                         pattern="[1-9][0-9]{3} ?(?!sa|sd|ss)[a-zA-Z]{2}"
-                        placeholder="1010 AA"
+                        placeholder="5010 AA"
                         size="10"
                         required
                         autocomplete="off"
@@ -272,6 +272,15 @@ function getStraatnaam($postcode, $huisnummer)
 
 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}$/', $cleanPostcode)) {
@@ -280,10 +289,12 @@ function postcode_in_range($postcode)
 
     $numberPart = (int) substr($cleanPostcode, 0, 4);
 
-    return ($numberPart >= 4800 && $numberPart <= 4899) ||
-        ($numberPart >= 5000 && $numberPart <= 5199) ||
-        ($numberPart >= 5260 && $numberPart <= 5268) ||
-        ($numberPart >= 5688 && $numberPart <= 5689);
+    foreach ($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()