wp-postcode-plugin/prijs-per-postcode.php

<?php

session_start();
require_once "session_dialog.php";
/*
 * Plugin Name: Goedkoop Tilburg
 * Description: veschillende prijzen per postdoce. een range posctcodes zijn "lokaal" andere zijn overig
 * Author: Remo Zaros
 * Version: 0.0.1
 * Text Domeain: prijs-per-postcode
 */

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");
    }

    public function init()
    {
        $uri = $_SERVER["REQUEST_URI"];
        if_needed_place_postcode_form($uri);

        add_action("woocommerce_product_query", [
            $this,
            "custom_show_products_by_tag",
        ]);
        add_action("template_redirect", [$this, "redirect_if_missing_tag"]);
        add_action("template_redirect", [
            $this,
            "force_404_for_specific_product_tags",
        ]);
        add_action("template_redirect", [
            $this,
            "redirect_checkout_if_lokaaltarief_not_set",
        ]);
        add_action("wp_footer", [$this, "set_checkout_fields_with_javascript"]);
        add_filter("woocommerce_checkout_fields", [
            $this,
            "make_checkout_fields_readonly",
        ]);
        add_filter("woocommerce_product_related_posts_query", [
            $this,
            "custom_filter_related_products_by_session_tag",
        ]);
        add_filter(
            "get_the_terms",
            [$this, "hide_lokaal_and_overige_regios_tags"],
            10,
            3,
        );
    }

    public function set_checkout_fields_with_javascript()
    {
        if (!is_checkout() || is_wc_endpoint_url()) {
            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">
                jQuery(document).ready(function($){
                    $('#billing_city').val('<?php echo esc_js(
                        $woonplaats,
                    ); ?>');
                    $('#billing_postcode').val('<?php echo esc_js(
                        $postcode,
                    ); ?>');
                    $('#billing_address_1').val('<?php echo esc_js(
                        $address,
                    ); ?>');
                });
                </script>
                <?php
    }

    public function custom_show_products_by_tag($q)
    {
        if (
            !is_admin() &&
            $q->is_main_query() &&
            (is_shop() || is_product_category() || is_home())
        ) {
            $show_lokaal = $_SESSION["lokaal_tarief"] ?? false;

            $tag_to_show = $show_lokaal ? "lokaal" : "algemeen";

            $tax_query = [
                [
                    "taxonomy" => "product_tag",
                    "field" => "slug",
                    "terms" => [$tag_to_show],
                    "operator" => "IN",
                ],
            ];
            $q->set("tax_query", $tax_query);
        }
    }

    public function redirect_if_missing_tag()
    {
        // Only run on frontend single product pages
        if (is_admin() || !is_singular("product")) {
            return;
        }

        $product_id = get_the_ID();
        $product = wc_get_product($product_id);

        $show_lokaal = $_SESSION["lokaal_tarief"] ?? false;
        $tag_to_show = $show_lokaal ? "lokaal" : "algemeen";

        if (!$product || !has_term($tag_to_show, "product_tag", $product_id)) {
            wp_redirect(home_url("/shop")); // Works with Dutch permalink
            exit();
        }
    }

    public function hide_lokaal_and_overige_regios_tags(
        $terms,
        $post_id,
        $taxonomy,
    ) {
        if ($taxonomy === "product_tag" && !is_admin()) {
            $tags_to_hide = ["lokaal", "algemeen"];
            return array_filter($terms, function ($term) use ($tags_to_hide) {
                return !in_array($term->slug, $tags_to_hide);
            });
        }
        return $terms;
    }

    public function make_checkout_fields_readonly($fields)
    {
        $readonly_fields = [
            "billing_address_1",
            "billing_city",
            "billing_postcode",
        ];

        foreach ($readonly_fields as $field) {
            if (isset($fields["billing"][$field])) {
                $fields["billing"][$field]["custom_attributes"][
                    "readonly"
                ] = true;
            }
        }
        return $fields;
    }

    public function custom_filter_related_products_by_session_tag($query)
    {
        // Start session if not already started
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }

        // Determine which tag to exclude based on session
        $show_lokaal = $_SESSION["lokaal_tarief"] ?? false;
        $exclude_tag = $show_lokaal ? "algemeen" : "lokaal";

        global $wpdb;

        // Get term_taxonomy_id for the tag to exclude
        $excluded_term = $wpdb->get_var(
            $wpdb->prepare(
                "SELECT term_taxonomy_id FROM {$wpdb->term_taxonomy} tt
             JOIN {$wpdb->terms} t ON tt.term_id = t.term_id
             WHERE tt.taxonomy = 'product_tag' AND t.slug = %s",
                $exclude_tag,
            ),
        );

        if ($excluded_term) {
            $query[
                "join"
            ] .= " LEFT JOIN {$wpdb->term_relationships} exclude_tr ON exclude_tr.object_id = p.ID ";
            $query["where"] .= $wpdb->prepare(
                " AND ( exclude_tr.term_taxonomy_id != %d OR exclude_tr.term_taxonomy_id IS NULL )",
                $excluded_term,
            );
        }

        return $query;
    }

    function redirect_checkout_if_lokaaltarief_not_set()
    {
        // Check if we are on the checkout, product, or cart page
        if (is_checkout() || is_product() || is_cart()) {
            // Prevent redirect on checkout endpoints (order-received, etc.)
            if (is_wc_endpoint_url()) {
                return;
            }

            // Check if the session variable is NOT set
            if (!isset($_SESSION["lokaal_tarief"])) {
                wc_clear_notices();
                wc_add_notice(
                    __(
                        "Local rate not available. Redirecting to shop.",
                        "woocommerce",
                    ),
                    "notice",
                );
                wp_safe_redirect(wc_get_page_permalink("shop"));
                exit();
            }
        }
    }

    public function force_404_for_specific_product_tags()
    {
        // Check if it's a product tag archive
        if (is_tax("product_tag")) {
            $tag = get_queried_object();

            // List of tag slugs to block
            $blocked_tags = ["lokaal", "algemeen"];

            // If the current tag is in the blocked list, trigger 404
            if (in_array($tag->slug, $blocked_tags)) {
                global $wp_query;
                $wp_query->set_404();
                status_header(404);
            }
        }
    }
}

new PrijsPerPostcode();