<?php
/**
 * Plugin Name: Google Indexer — job board bridge
 * Description: Sends job URLs to your self-hosted Google Indexer: URL_UPDATED when a job is published, URL_DELETED when it expires or is deleted.
 * Version: 1.0.1
 *
 * Works with WP Job Manager (job_listing) and WP Job Openings (awsm_job_openings).
 * Needs Google Indexer 1.3+ (https://shop.lumnika.com/google-indexer.html) with GI_API_TOKEN set.
 *
 * Install in 3 steps:
 *   1. Save this file as wp-content/mu-plugins/google-indexer-wp.php
 *   2. In wp-config.php add:
 *        define('GI_ENDPOINT', 'https://your-site.com/indexer/index.php');
 *        define('GI_API_TOKEN', 'the same token you set in Google Indexer');
 *   3. Publish a job: its URL appears in the Google Indexer log within seconds.
 *
 * Publishing waits at most 2 seconds, even if Google Indexer is down: Google Indexer keeps
 * working after the bridge hangs up. If Google is over quota, Google Indexer queues the URL
 * and the cron sends it the next day.
 */

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

const GI_WP_JOB_TYPES = ['job_listing', 'awsm_job_openings'];

/** Sends one batch to Google Indexer: $type is 'updated' (URL_UPDATED) or 'deleted' (URL_DELETED). */
function gi_wp_send(array $urls, string $type): void {
    if (!defined('GI_ENDPOINT') || !defined('GI_API_TOKEN') || !$urls) return;
    $endpoint = GI_ENDPOINT . (str_contains(GI_ENDPOINT, '?') ? '&' : '?') . 'api=1';
    wp_remote_post($endpoint, [
        'headers'  => ['Content-Type' => 'application/json', 'X-GI-Token' => GI_API_TOKEN],
        'body'     => wp_json_encode(['urls' => array_values($urls), 'type' => $type]),
        // WordPress still waits for the reply even with blocking=false: the short timeout is the real cap.
        'timeout'  => 2,
        'blocking' => false,
    ]);
}

function gi_wp_is_job($post): bool {
    return $post instanceof WP_Post && in_array($post->post_type, GI_WP_JOB_TYPES, true);
}

/** Public URL even once the job is no longer published (get_permalink would return ?p=ID). */
function gi_wp_url(WP_Post $post): string {
    $public = clone $post;
    $public->post_status = 'publish';
    $public->post_name = preg_replace('/__trashed$/', '', $public->post_name);
    return get_permalink($public);
}

/** Expiry fires both the status change and WP Job Manager's own hook: send each URL once per request. */
function gi_wp_once(WP_Post $post, string $type): void {
    static $sent = [];
    $url = gi_wp_url($post);
    if (isset($sent[$type . $url])) return;
    $sent[$type . $url] = true;
    gi_wp_send([$url], $type);
}

// Published (new or re-published) -> URL_UPDATED; leaving 'publish' (expired, draft, trash) -> URL_DELETED.
add_action('transition_post_status', function ($new, $old, $post) {
    if (!gi_wp_is_job($post)) return;
    if ($new === 'publish') gi_wp_once($post, 'updated');
    elseif ($old === 'publish') gi_wp_once($post, 'deleted');
}, 10, 3);

// WP Job Manager marks expired jobs with its own status; also covers the cron that expires them.
add_action('job_manager_job_expired', function ($post_id) {
    $post = get_post($post_id);
    if (gi_wp_is_job($post)) gi_wp_once($post, 'deleted');
});

// Hard delete of a published job (bypassing trash).
add_action('before_delete_post', function ($post_id) {
    $post = get_post($post_id);
    if (gi_wp_is_job($post) && $post->post_status === 'publish') gi_wp_once($post, 'deleted');
});