<?php

/*
 *
 *  ____            _        _   __  __ _                  __  __ ____  
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \ 
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/ 
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_| 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 * 
 *
*/

namespace pocketmine\utils;


/**
 * Manages PocketMine-MP version strings, and compares them
 */
class VersionString{
	public static $stageOrder = [
		"alpha" => 0,
		"a" => 0,
		"beta" => 1,
		"b" => 1,
		"final" => 2,
		"f" => 2,
	];
	private $stage;
	private $major;
	private $build;
	private $minor;
	private $development = false;
	private $generation;

	public function __construct($version = \pocketmine\VERSION){
		if(is_int($version)){
			$this->minor = $version & 0x1F;
			$this->major = ($version >> 5) & 0x0F;
			$this->generation = ($version >> 9) & 0x0F;
			$this->stage = array_search(($version >> 13) & 0x0F, VersionString::$stageOrder, true);
		}else{
			$version = preg_split("/([A-Za-z]*)[ _\\-]([0-9]*)\\.([0-9]*)\\.{0,1}([0-9]*)(dev|)(-[\\0-9]{1,}|)/", $version, -1, PREG_SPLIT_DELIM_CAPTURE);
			$this->stage = strtolower($version[1]); //0-15
			$this->generation = (int) $version[2]; //0-15
			$this->major = (int) $version[3]; //0-15
			$this->minor = (int) $version[4]; //0-31
			$this->development = $version[5] === "dev" ? true : false;
			if($version[6] !== ""){
				$this->build = intval(substr($version[6], 1));
			}else{
				$this->build = 0;
			}
		}
	}

	public function getNumber(){
		return (int) (VersionString::$stageOrder[$this->stage] << 13) + ($this->generation << 9) + ($this->major << 5) + $this->minor;
	}

	public function getStage(){
		return $this->stage;
	}

	public function getGeneration(){
		return $this->generation;
	}

	public function getMajor(){
		return $this->major;
	}

	public function getMinor(){
		return $this->minor;
	}

	public function getRelease(){
		return $this->generation . "." . $this->major . ($this->minor > 0 ? "." . $this->minor : "");
	}

	public function getBuild(){
		return $this->build;
	}

	public function isDev(){
		return $this->development === true;
	}

	public function get($build = false){
		return ucfirst($this->stage) . "_" . $this->getRelease() . ($this->development === true ? "dev" : "") . (($this->build > 0 and $build === true) ? "-" . $this->build : "");
	}

	public function __toString(){
		return $this->get();
	}

	public function compare($target, $diff = false){
		if(($target instanceof VersionString) === false){
			$target = new VersionString($target);
		}
		$number = $this->getNumber();
		$tNumber = $target->getNumber();
		if($diff === true){
			return $tNumber - $number;
		}
		if($number > $tNumber){
			return -1; //Target is older
		}elseif($number < $tNumber){
			return 1; //Target is newer
		}elseif($target->getBuild() > $this->getBuild()){
			return 1;
		}elseif($target->getBuild() < $this->getBuild()){
			return -1;
		}else{
			return 0; //Same version
		}
	}
}