<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class LM_Updater {

    /** @var string */
    private $plugin_slug;

    /** @var string */
    private $plugin_basename;

    public function __construct() {
        $this->plugin_slug     = 'link-manager';
        $this->plugin_basename = plugin_basename( LM_PLUGIN_FILE );

        add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_for_update' ) );
        add_filter( 'plugins_api', array( $this, 'plugin_info' ), 10, 3 );
        add_action( 'upgrader_process_complete', array( $this, 'post_update' ), 10, 2 );
    }

    /**
     * Check the panel for a newer plugin version.
     *
     * @param object $transient
     * @return object
     */
    public function check_for_update( $transient ) {
        if ( empty( $transient->checked ) ) {
            return $transient;
        }

        $panel_url = get_option( 'lm_panel_url', '' );
        if ( empty( $panel_url ) ) {
            return $transient;
        }

        $token = get_option( 'lm_site_token', '' );

        $response = wp_remote_get(
            trailingslashit( $panel_url ) . 'api/plugin/version',
            array(
                'timeout' => 10,
                'headers' => array(
                    'X-Site-Token' => $token,
                ),
            )
        );

        if ( is_wp_error( $response ) ) {
            return $transient;
        }

        $body = json_decode( wp_remote_retrieve_body( $response ), true );
        if ( ! is_array( $body ) || empty( $body['version'] ) ) {
            return $transient;
        }

        $remote_version = $body['version'];

        if ( version_compare( LM_VERSION, $remote_version, '<' ) ) {
            $transient->response[ $this->plugin_basename ] = (object) array(
                'slug'        => $this->plugin_slug,
                'plugin'      => $this->plugin_basename,
                'new_version' => $remote_version,
                'url'         => $panel_url,
                'package'     => trailingslashit( $panel_url ) . 'api/plugin/download?token=' . urlencode( $token ),
                'tested'      => $body['tested'] ?? '',
                'requires'    => $body['requires'] ?? '5.8',
            );
        }

        return $transient;
    }

    /**
     * Provide plugin information for the WordPress plugin details modal.
     *
     * @param false|object|array $result
     * @param string             $action
     * @param object             $args
     * @return false|object
     */
    public function plugin_info( $result, $action, $args ) {
        if ( $action !== 'plugin_information' || ( $args->slug ?? '' ) !== $this->plugin_slug ) {
            return $result;
        }

        $panel_url = get_option( 'lm_panel_url', '' );
        if ( empty( $panel_url ) ) {
            return $result;
        }

        $token    = get_option( 'lm_site_token', '' );
        $response = wp_remote_get(
            trailingslashit( $panel_url ) . 'api/plugin/version',
            array(
                'timeout' => 10,
                'headers' => array(
                    'X-Site-Token' => $token,
                ),
            )
        );

        if ( is_wp_error( $response ) ) {
            return $result;
        }

        $body = json_decode( wp_remote_retrieve_body( $response ), true );
        if ( ! is_array( $body ) ) {
            return $result;
        }

        return (object) array(
            'name'            => 'LinkManager',
            'slug'            => $this->plugin_slug,
            'version'         => $body['version'] ?? LM_VERSION,
            'author'          => 'LinkManager',
            'homepage'        => $panel_url,
            'download_link'   => trailingslashit( $panel_url ) . 'api/plugin/download?token=' . urlencode( $token ),
            'requires'        => $body['requires'] ?? '5.8',
            'tested'          => $body['tested'] ?? '',
            'sections'        => array(
                'description' => $body['description'] ?? 'Link network management plugin.',
                'changelog'   => $body['changelog'] ?? '',
            ),
        );
    }

    /**
     * Run post-update tasks after the plugin has been upgraded.
     *
     * @param WP_Upgrader $upgrader
     * @param array       $options
     */
    public function post_update( $upgrader, $options ) {
        if (
            $options['action'] !== 'update' ||
            $options['type'] !== 'plugin' ||
            empty( $options['plugins'] )
        ) {
            return;
        }

        if ( ! in_array( $this->plugin_basename, $options['plugins'], true ) ) {
            return;
        }

        // Clear update transient so WP re-checks.
        delete_site_transient( 'update_plugins' );

        // Re-run heartbeat to notify panel of new version.
        $heartbeat = new LM_Heartbeat();
        $heartbeat->send_heartbeat();
    }
}