<?php
/**
 * Automatic Plugin Updater
 *
 * Checks for updates from Gitea repository and installs them automatically
 */
class TWP_Auto_Updater {

    private $plugin_slug = 'twilio-wp-plugin';
    private $plugin_basename;
    private $gitea_repo = 'wp-plugins/twilio-wp-plugin';
    private $gitea_api_url;
    private $current_version;
    private $gitea_base_url = 'https://repo.anhonesthost.net';

    /**
     * Constructor
     */
    public function __construct() {
        $this->plugin_basename = plugin_basename(dirname(dirname(__FILE__)) . '/twilio-wp-plugin.php');
        $this->current_version = defined('TWP_VERSION') ? TWP_VERSION : '0.0.0';
        $this->gitea_api_url = $this->gitea_base_url . '/api/v1/repos/' . $this->gitea_repo . '/releases/latest';
    }

    /**
     * Initialize updater hooks
     */
    public function init() {
        // Hook into WordPress update checks
        add_filter('pre_set_site_transient_update_plugins', array($this, 'check_for_update'));
        add_filter('plugins_api', array($this, 'plugin_info'), 10, 3);

        // Add settings page for manual check
        add_action('admin_init', array($this, 'register_settings'));

        // Add update check to admin notices
        if (get_option('twp_auto_update_enabled', '1') === '1') {
            add_action('admin_init', array($this, 'maybe_auto_check_updates'));
        }
    }

    /**
     * Register auto-update settings
     */
    public function register_settings() {
        register_setting('twp_settings', 'twp_auto_update_enabled');
        register_setting('twp_settings', 'twp_gitea_repo');
        register_setting('twp_settings', 'twp_gitea_token'); // Optional for private repos
    }

    /**
     * Check for updates periodically
     */
    public function maybe_auto_check_updates() {
        $last_check = get_option('twp_last_update_check', 0);
        $check_interval = 12 * HOUR_IN_SECONDS; // Check every 12 hours

        if (time() - $last_check > $check_interval) {
            update_option('twp_last_update_check', time());
            // Force WordPress to check for updates
            wp_clean_plugins_cache();
        }
    }

    /**
     * Check for plugin updates
     */
    public function check_for_update($transient) {
        if (empty($transient->checked)) {
            return $transient;
        }

        // Get Gitea repo from settings if available
        $custom_repo = get_option('twp_gitea_repo', '');
        if (!empty($custom_repo)) {
            $this->gitea_repo = $custom_repo;
            $this->gitea_api_url = $this->gitea_base_url . '/api/v1/repos/' . $this->gitea_repo . '/releases/latest';
        }

        $update_info = $this->get_latest_release();

        if ($update_info && version_compare($this->current_version, $update_info->version, '<')) {
            $plugin_data = array(
                'id' => 'twilio-wp-plugin',
                'slug' => $this->plugin_slug,
                'plugin' => $this->plugin_basename,
                'new_version' => $update_info->version,
                'url' => $update_info->homepage,
                'package' => $update_info->download_url,
                'tested' => '6.8',
                'requires' => '5.8',
                'requires_php' => '7.4',
                'icons' => array(),
                'banners' => array(),
                'compatibility' => new stdClass(),
            );

            $transient->response[$this->plugin_basename] = (object) $plugin_data;

            error_log("TWP Auto-Updater: New version {$update_info->version} available (current: {$this->current_version})");
        } else {
            error_log("TWP Auto-Updater: No updates available (current: {$this->current_version})");
        }

        return $transient;
    }

    /**
     * Get plugin information for update screen
     */
    public function plugin_info($false, $action, $args) {
        if ($action !== 'plugin_information') {
            return $false;
        }

        if (!isset($args->slug) || $args->slug !== $this->plugin_slug) {
            return $false;
        }

        $update_info = $this->get_latest_release();

        if (!$update_info) {
            return $false;
        }

        $plugin_info = new stdClass();
        $plugin_info->name = 'Twilio WP Plugin';
        $plugin_info->slug = $this->plugin_slug;
        $plugin_info->version = $update_info->version;
        $plugin_info->author = '<a href="https://cybercove.io/">Joshua Knapp</a>';
        $plugin_info->homepage = $update_info->homepage;
        $plugin_info->download_link = $update_info->download_url;
        $plugin_info->requires = '5.8';
        $plugin_info->tested = '6.8';
        $plugin_info->requires_php = '7.4';
        $plugin_info->last_updated = $update_info->release_date;
        $plugin_info->downloaded = 10;

        $plugin_info->sections = array(
            'description' => '<p>Twilio WordPress Plugin for call management and mobile app support.</p>',
            'changelog' => '<pre>' . esc_html($update_info->changelog) . '</pre>',
            'installation' => '<p>Upload the plugin to your WordPress site and activate it.</p>'
        );

        return $plugin_info;
    }

    /**
     * Get latest release information from Gitea
     */
    private function get_latest_release() {
        // Check cache first (1 hour)
        $cache_key = 'twp_latest_release';
        $cached = get_transient($cache_key);

        if ($cached !== false) {
            return $cached;
        }

        // Use cURL for Gitea API
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $this->gitea_api_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json'));
        curl_setopt($ch, CURLOPT_USERAGENT, 'WordPress/Twilio-WP-Plugin-Updater');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);

        // Add Gitea token if configured (for private repos)
        $gitea_token = get_option('twp_gitea_token', '');
        if (!empty($gitea_token)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, array(
                'Accept: application/json',
                'Authorization: token ' . $gitea_token
            ));
        }

        $response = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if (!$response || $http_code !== 200) {
            error_log("TWP Auto-Updater: Gitea API returned status $http_code");
            return false;
        }

        $release = json_decode($response);

        if (!$release || !isset($release->tag_name)) {
            error_log('TWP Auto-Updater: Invalid release data from Gitea');
            return false;
        }

        // Parse release information
        $version = ltrim($release->tag_name, 'v'); // Remove 'v' prefix if present
        $download_url = null;

        // Find the zip asset
        if (isset($release->assets) && is_array($release->assets)) {
            foreach ($release->assets as $asset) {
                if (strpos($asset->name, '.zip') !== false) {
                    $download_url = $asset->browser_download_url;
                    break;
                }
            }
        }

        // Fallback to zipball if no asset found
        if (!$download_url) {
            $download_url = $release->zipball_url;
        }

        // Format changelog
        $changelog = !empty($release->body) ? $release->body : 'No changelog provided for this release.';

        // Handle empty changelog
        if (empty(trim($changelog))) {
            $changelog = "Version " . $version . "\n\n" .
                        "Released on " . date('F j, Y', strtotime($release->published_at)) . "\n\n" .
                        "* Updated plugin files";
        }

        $update_info = (object) array(
            'version' => $version,
            'download_url' => $download_url,
            'homepage' => $this->gitea_base_url . '/' . $this->gitea_repo,
            'release_date' => $release->published_at,
            'description' => $changelog,
            'changelog' => $changelog
        );

        // Cache for 1 hour
        set_transient($cache_key, $update_info, HOUR_IN_SECONDS);

        return $update_info;
    }

    /**
     * Manual update check (for admin page)
     */
    public function manual_check_for_updates() {
        // Clear cache
        delete_transient('twp_latest_release');
        update_option('twp_last_update_check', 0);

        // Force WordPress to check
        wp_clean_plugins_cache();
        delete_site_transient('update_plugins');

        $update_info = $this->get_latest_release();

        if (!$update_info) {
            return array(
                'success' => false,
                'message' => 'Failed to check for updates. Please check your internet connection and Gitea repository settings.'
            );
        }

        if (version_compare($this->current_version, $update_info->version, '<')) {
            return array(
                'success' => true,
                'update_available' => true,
                'current_version' => $this->current_version,
                'latest_version' => $update_info->version,
                'message' => "Update available: Version {$update_info->version}. Go to Plugins page to update."
            );
        } else {
            return array(
                'success' => true,
                'update_available' => false,
                'current_version' => $this->current_version,
                'message' => 'You are running the latest version.'
            );
        }
    }

    /**
     * Get current update status
     */
    public function get_update_status() {
        $update_info = $this->get_latest_release();

        return array(
            'current_version' => $this->current_version,
            'latest_version' => $update_info ? $update_info->version : 'Unknown',
            'update_available' => $update_info && version_compare($this->current_version, $update_info->version, '<'),
            'last_check' => get_option('twp_last_update_check', 0),
            'auto_update_enabled' => get_option('twp_auto_update_enabled', '1') === '1'
        );
    }
}