<?php
/**
 * A11yBridge Licensing System
 */

// WP.org: License data is used only for external AI service operations (quota/account). No local feature gating is performed.

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

// Load license API class (try both typical locations to be robust)
if (!class_exists('A11YB_License_API')) {
    $a11ybridge_base_dir = plugin_dir_path(__FILE__);

    $a11ybridge_candidate_paths = [
        $a11ybridge_base_dir . 'class-a11ybridge-license.php',
        $a11ybridge_base_dir . 'includes/class-a11ybridge-license.php',
    ];

    foreach ($a11ybridge_candidate_paths as $a11ybridge_candidate) {
        if (file_exists($a11ybridge_candidate)) {
            require_once $a11ybridge_candidate;
            break;
        }
    }
}

/**
 * Fetches the current license status from the backend via
 * A11YB_License_API::status() and updates local options there.
 *
 * Returns: array with plan, monthly_limit, monthly_used, status, domain, etc.
 *
 * @param array $meta Optional metadata to send along.
 * @return array
 */
function a11ybridge_refresh_license_status(array $meta = []) {
    $req = new \WP_REST_Request('POST', '/a11ybridge/v1/license/status');
    $req->set_param('meta', $meta);

    $resp = A11YB_License_API::status($req);

    if ($resp instanceof \WP_REST_Response) {
        $data = $resp->get_data();
    } else {
        // Fallback if something unexpected happens
        $data = is_array($resp) ? $resp : [];
    }

    // No option updates here – this already happens in A11YB_License_API::status()
    return $data;
}

/**
 * Central license status helper.
 *
 * @return array
 */
function a11ybridge_get_license_status() {
    $data = a11ybridge_refresh_license_status([]);

    return $data;
}


/**
 * Sign a payload for backend calls (HMAC).
 *
 * @param array $data
 * @return array [payload_json, signature]
 */
function a11ybridge_sign_payload(array $data): array {
    $payload = wp_json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    $secret  = (string) get_option('a11ybridge_client_secret'); // set by backend during domain binding
    $sig     = hash_hmac('sha256', $payload, $secret ?: '');

    return [$payload, $sig];
}


// Base URL of your license backend
if (!defined('A11YBRIDGE_BACKEND_BASE')) {
    define('A11YBRIDGE_BACKEND_BASE', 'https://a11ybridge.de');
}

/**
 * Build backend REST URL for license server.
 *
 * @param string $path e.g. '/license/status'
 * @return string
 */
function a11ybridge_backend_rest_url(string $path): string {
    return rtrim(A11YBRIDGE_BACKEND_BASE, '/') . '/wp-json/a11ybridge/v1' . $path;
}

// Filter: activate endpoint
add_filter('a11ybridge_license_activate_endpoint', function ($default) {
    return a11ybridge_backend_rest_url('/license/activate');
});

// Filter: status endpoint
add_filter('a11ybridge_license_status_endpoint', function ($default) {
    return a11ybridge_backend_rest_url('/license/status');
});

// Optional: domains/delete endpoint
add_filter('a11ybridge_license_domains_delete_endpoint', function ($default) {
    return a11ybridge_backend_rest_url('/license/domains/delete');
});