<?php

namespace App;

use Cylab\Mark\Client;
use Composer\Semver\Semver;

/**
 * Description of Mark
 *
 * @author tibo
 */
class Mark
{
    private static $VERSION_CONSTRAINT = "^2.3.0";
    private static $instance;

    public static function get() : Client
    {
        if (self::$instance !== null) {
            return self::$instance;
        }

        $mark_url = 'http://' . config("app.mark_host") . ':' . config('app.mark_port');
        $instance = new Client($mark_url);

        // test we can connect to the server
        try {
            $instance->test();
        } catch (\JsonRPC\Exception\ConnectionFailureException $ex) {
            session()->flash('error', 'Failed to connect to MARk server at ' . $mark_url);
            abort(redirect('app/error'));
        }

        // test the server satisfies the required version
        // first remove the -SNAPSHOT suffix, so we can use development version of MARk
        $server_version = str_replace("-SNAPSHOT", "", $instance->status()["version"]);
        if (! Semver::satisfies($server_version, self::$VERSION_CONSTRAINT)) {
            session()->flash('error', 'MARk server does not satisfy required version '
                    . self::$VERSION_CONSTRAINT);
            abort(redirect('app/error'));
        }

        self::$instance = $instance;
        return $instance;
    }
}