<?php

/**
 * Namespace for classes and functions related to the game Factorio.
 * @package NAE\Factorio
 */
namespace NAE\Factorio;

/**
 * Class for managing a headless server for the game Factorio.
 * @author "Marcel Naeve" <php@naeve.info>
 * @license MIT License (http://www.opensource.org/licenses/mit)
 */
class FactorioServer {

    /**
     * @var FactorioVersion Current Version of Server
     */
    private $version;

    /**
     * @var FactorioMod For Managing Server Mods
     */
    private $mods;

    /**
     * @var ValveRcon for handling Valve Rcon to server
     */
    private $rcon;

    /**
     * @var string Name of the Save to load when starting the server
     */
    private $save_name;

    /**
     * @var string Path to the Server Directory
     */
    private $server_dir = INDEX_DIR . "/factorio";

    /**
     * @var string Path to the Mods Directory
     */
    private $mod_dir = INDEX_DIR . "/factorio/mods";

    /**
     * @var string Path to the Save-File Directory
     */
    private $save_dir = INDEX_DIR . "/factorio/saves";

    /**
     * @var string Name of the user who owns the files and runs this server
     */
    private $user_name = "factorio";

    /**
     * @var string Name of the user-group who owns the files and runs this server
     */
    private $user_group = "factorio";


    /**
     * @var string Name of the Service in systemd/systemctl
     */
    private $service_name = "factorio";

    /**
     * @var callcable Custom function for stopping the server (return bool)
     */
    private $customStop = null;

    /**
     * @var callable Custom function for starting the server (return bool)
     */
    private $customStart = null;

    /**
     * @var callable Custom function for restarting the server (return bool)
     */
    private $customReStart = null;

    /**
     * @var callable Custom function for checking the server status (return bool - true means server is running, false means server is not running)
     */
    private $customIsRunning = null;

    /**
     * @var array Server Settings
     */
    private $settings = [];

    /**
     * @var array Environment Variables for the Server
     */
    private $env = [];

    /**
     * @var array Server Admin List
     */
    private $admin_list = [];


    /**
     * Constructor
     *
     * @param array $settings Settings for the server
     */
    public function __construct(array $settings) {
        // TODO: Implement
    }

    /**
     * Updates the Server with optional feedback on cli.
     * @param bool $silent Feedback on cli wanted? (default: false)
     * @return bool Returns true on success, false on failure
     */
    public function updateCli(bool $silent=false) : bool {
        // TODO: Implement
        return false;
    }

    /**
     * Install a new Server with the current Settings with optional feedback on cli.
     * @param string $version Which version should be installed? (default: latest)
     * @param bool $silent Feedback on cli wanted? (default: false)
     * @return bool Returns true on success, false on failure
     */
    public function installCli(string $version="latest", bool $silent=false) : bool {
        // TODO: Implement
        return false;
    }

    /**
     * Sets a custom function for stopping the server.
     * @param callable function that is beeing called for stopping the server
     * @return FactorioServer $this for chaining.
     */
    public function setCustomStop(callable $customStop) : FactorioServer {

        $this->customStop = $customStop;

        return $this;

    }

    /**
     * Sets a custom function for starting the server.
     * @param callable function that is beeing called for starting the server
     * @return FactorioServer $this for chaining.
     */
    public function setCustomStart(callable $customStart) : FactorioServer {

        $this->customStart = $customStart;

        return $this;

    }

    /**
     * Stops the server.
     * @return bool true on success, false on failure
     */
    public function stop() : bool {

        if(is_callable($this->customStop)) {
            return call_user_func($this->customStop);
        }

        $command = "systemctl stop factorio-server";
        exec($command, $output, $return);

        return ( $return === 0 );

    }

    /**
     * Starts the server.
     * @return bool true on success, false on failure
     */
    public function start() : bool {
        
        if(is_callable($this->customStart)) {
            return call_user_func($this->customStart);
        }

        $command = "systemctl start ".$this->getServiceName();
        exec($command, $output, $return);
        
        return ( $return === 0 );

    }

    /**
     * Restarts the server.
     * @return bool true on success, false on failure
     */
    public function restart() : bool {
        
        if(is_callable($this->customReStart)) {
            return call_user_func($this->customReStart);
        }

        exec("systemctl restart ".$this->getServiceName()." > /dev/null", $output, $return);

        return ( $return === 0 );

    }

    /**
     * Check if the Service is running
     * 
     * @return bool True if the service is running, false otherwise
     */
    public function isRunning() : bool {

        if(is_callable($this->customIsRunning)) {
            return call_user_func($this->customIsRunning);
        }

        exec("systemctl is-active ".$this->getServiceName(), $output, $return);

        return ( $return === 0 );

    }

    /**
     * Get the Name of the Service in systemd/systemctl.
     * @return string Name of the service
     */
    public function getServiceName() : string {

        return $this->service_name;

    }

    /**
     * Sets the Name of the Service in systemd/systemctl.
     * @param string $serviceName Name of the Service
     * @return FactorioServer $this for chaining.
     */
    public function setServiceName(string $serviceName) : FactorioServer {

        $this->service_name = $serviceName;

        return $this;

    }

}