<?php

// Register a custom REST API endpoint for Select2 user dropdown
add_action('rest_api_init', function () {
    register_rest_route('acct_api/v2', '/drop_users', array(
        'methods' => 'POST',
        'callback' => 'acct_api_drop_users',
        'permission_callback' => '__return_true',
    ));
});

// Define the callback function for the custom endpoint
function acct_api_drop_users(WP_REST_Request $request) {
    // Sanitize and retrieve parameters
    $parameters = $request->get_params();
    $search = isset($parameters['q']['term']) ? sanitize_text_field($parameters['q']['term']) : '';
    $page = isset($parameters['page_result']) ? max(1, intval($parameters['page_result'])) : 1;
    $limit = isset($parameters['limit']) ? max(1, intval($parameters['limit'])) : 20;

    // Calculate offset for pagination
    $offset = ($page - 1) * $limit;

    // Fetch users
    $args = [
        'search' => "*{$search}*", // Perform a wildcard search
        'search_columns' => ['user_login', 'user_email', 'display_name'],
        'number' => $limit,
        'offset' => $offset,
        'orderby' => 'display_name',
        'order' => 'ASC',
    ];
    $user_query = new WP_User_Query($args);
    $db_results = $user_query->get_results();
    $total_users = $user_query->get_total();

    // Prepare the results for Select2
    $results = [];
    foreach ($db_results as $user) {
        $results[] = [
            'id' => $user->ID,
            'text' => "#{$user->ID}, {$user->display_name}",
        ];
    }

    // Construct the response
    $response = [
        'results' => $results,
        'pagination' => [
            'more' => ($total_users > $offset + $limit), // Check if more results are available
        ],
        'success' => true,
    ];

    return rest_ensure_response($response);
}