<?php

/**
 * Calendar state container.
 *
 * @author     Time.ly Network Inc.
 * @since      2.3
 *
 * @package    AI1EC
 * @subpackage AI1EC.Lib.Calendar
 */
class Ai1ec_Calendar_Updates extends Ai1ec_Base {

    /**
     * Primary update endpoint.
     *
     * @const string
     */
    const PRIMARY_END_POINT = 'https://update.time.ly/update';

    /**
     * Alternative update endpoint.
     *
     * @const string
     */
    const SECONDARY_END_POINT = 'https://checkout.time.ly/update';

    /**
     * Check updates and return additional info.
     *
     * @param mixed $transient_data Current transient data.
     *
     * @return mixed Modified transient data.
     */
    public function check_updates( $transient_data ) {
        if ( empty( $transient_data ) ) {
            return $transient_data;
        }
        $updates = $this->_download_updates();
        if ( empty( $updates ) ) {
            return $transient_data;
        }
        $plugins = get_plugins();
        foreach ( $updates as $plugin => $update_data ) {
            /** @var $plugin_data array */
            $plugin_data = isset( $plugins[$plugin] ) ? $plugins[$plugin] : null;
            if (
                empty( $plugin_data['Version'] ) ||
                version_compare( $plugin_data['Version'], $update_data['new_version'], '>=' )
            ) {
                continue;
            }
            $transient_data->response[$plugin] = (object) $update_data;
        }

        return $transient_data;
    }

    /**
     * Get plugin data from retrieved and cached data.
     *
     * @param array      $data   Current data.
     * @param string     $action Action name.
     * @param array|null $args   Query arguments.
     *
     * @return mixed Plugin data.
     */
    public function plugins_api_filter( $data, $action = '', $args = null ) {
        /*
        if (
            'plugin_information' !== $action ||
            empty( $args->slug ) ||
            'all-in-one-event-calendar' !== substr( $args->slug, 0, 25 )
        ) {
            return $data;
        }
        $update_data       = get_site_transient( 'update_plugins' );
        $plugin_identifier = $args->slug . '/' . $args->slug . '.php';
        if ( empty( $update_data->response[$plugin_identifier] ) ) {
            return $data;
        }

        return $update_data->response[$plugin_identifier];
        */
        $updates = $this->_download_updates();

        return false;
    }

    /**
     * Clear updates related transients.
     *
     * @return void Method does not return.
     */
    public function clear_transients() {
        delete_site_transient( 'ai1ec_update_plugins' );
        delete_site_transient( 'update_plugins' );
    }

    /**
     * Download update info. Check local transient for cached data.
     *
     * @return array|mixed|null|object Update data.
     */
    protected function _download_updates() {
        $cached_updates = get_site_transient( 'ai1ec_update_plugins' );
        if ( $cached_updates ) {
            return $cached_updates;
        }
        // try first endpoint
        $response = $this->_get_data_from_endpoint( self::PRIMARY_END_POINT );
        if ( is_wp_error( $response ) ) {
            $response = $this->_get_data_from_endpoint( self::SECONDARY_END_POINT );
        }
        if ( is_wp_error( $response ) ) {
            return null;
        }

        $data = json_decode( wp_remote_retrieve_body( $response ), true );
        set_site_transient( 'ai1ec_update_plugins', $data, 30 * MINUTE_IN_SECONDS );

        return $data;
    }

    /**
     * Get update data from given endpoint.
     *
     * @param string $endpoint Endpoint URI.
     *
     * @return array|WP_Error Request result.
     */
    protected function _get_data_from_endpoint( $endpoint ) {

        // Use ticketing token to check for subscriptions
        $token = $this->_registry->get( 'model.api.api-registration' )->get_timely_token();
        if ( null === $token ) {
            $token = '';
        }

        $request = array(
            'method'    => 'GET',
            'timeout'   => 15,
            'sslverify' => false
        );

        return wp_remote_request( $endpoint . '/' . $token, $request );
    }
}