<?php

class Map{
    protected $length;
    protected $position;

    //---------------------------------------------

    function __construct(){
        $this->length=100;
        $this->position=1;
    }

    //---------------------------------------------

    public function next_step($val=1){
        if(is_numeric($val)){
            if(($this->position + $val) <= $this->length){
                $this->position += $val;
            }
        }

        if($this->is_snake()){
            $result = $val."-snake".$this->position;
        }
        elseif($this->is_ladder()){
            $result = $val."-ladder".$this->position;
        }
        else{
            $result = $val."-".$this->position;
        }

        return $result;

    }

    //---------------------------------------------

    private function is_snake(){
        if($this->position%9===0){
            $this->position-=3;
            return true;
        }
        return false;
    }

    //---------------------------------------------

    private function is_ladder(){
        if($this->position===25 || $this->position===55){
            $this->position+=10;
            return true;
        }
        return false;
    }

    //---------------------------------------------

    protected function is_finish(){
        if($this->position===100){
            return true;
        }
        return false;

    }

    //---------------------------------------------
}


class Gamer extends Map{
    private $name;
    private $step;

    function __construct($name='gamer-1'){
        parent::__construct();
        $this->name=is_string($name)? $name : "gamer-".rand(10-100);
        $this->step=0;
    }



    public function startGame(){
        echo "$this->name >> start\n";

        do{
            $this->step++;
            $step=$this->next_step($this->dice());
            echo "$this->name step-$this->step >> $step\n";

        } while(!$this->is_finish());

        echo "$this->name >> end of the game\n";
    }

    public function dice(){
        return rand(1,6);
    }

    public function getName(){
        return $this->name;
    }
}

if(isset($argv[1])){
    $name=$argv[1];
}
else{
    $name='gamer-1';
}


$gamer=new Gamer($name);
$gamer->startGame();