<?php
/* Tools.class.php - phpgitweb
 * Copyright (C) 2011-2012  Philipp Kreil (pk910)
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License 
 * along with this program. If not, see <http://www.gnu.org/licenses/>. 
 */

class Tools {
	const S_IFMT      = 170000;
	const S_IFGITLINK = 160000;
	const S_IFLNK     = 120000;
	const S_IFREG     = 100000;
	const S_IFDIR     =  40000;
	const S_IFINVALID =  30000;
	const S_IXUSR     =    100;
	
	public static function get_filetype($mode, $exec = false) {
		if(!preg_match('/^[0-7]+$/', $mode))
			return $mode;
		
		if(($mode & self::S_IFMT) == S_IFGITLINK)
			return 'submodule';
		else if(($mode & self::S_IFMT) == S_IFDIR)
			return 'directory';
		else if(($mode & self::S_IFMT) == S_IFLNK)
			return 'symlink';
		else if(($mode & self::S_IFMT) == S_IFREG) {
			if($exec && ($mode & self::S_IXUSR))
				return 'executable';
			return 'file';
		} else
			return 'unknown';
	}
	
	public static function age_calculate($last_change) {
		$result = array();
		$now = time();
		$age = ($last_change > 0 ? ($now - $last_change) : 0);
		
		if ($age > 60*60*24*365*2) {
			$age_str = floor($age/60/60/24/365);
			$age_str .= " years ago";
			$max_cache = (60*60*24*365) - ($age % (60*60*24*365));
		} else if ($age > 60*60*24*(365/12)*2) {
			$age_str = floor($age/60/60/24/(365/12));
			$age_str .= " months ago";
			$max_cache = min((60*60*24*(365/12)) - ($age % (60*60*24*(365/12))), (60*60*24*365*2) - $age);
		} else if ($age > 60*60*24*7*2) {
			$age_str = floor($age/60/60/24/7);
			$age_str .= " weeks ago";
			$max_cache = min((60*60*24*7) - ($age % (60*60*24*7)), (60*60*24*(365/12)*2) - $age);
		} else if ($age > 60*60*24*2) {
			$age_str = floor($age/60/60/24);
			$age_str .= " days ago";
			$max_cache = min((60*60*24) - ($age % (60*60*24)), (60*60*24*7*2) - $age);
		} else if ($age > 60*60*2) {
			$age_str = floor($age/60/60);
			$age_str .= " hours ago";
			$max_cache = min((60*60) - ($age % (60*60)), (60*60*24*2) - $age);
		} else if ($age > 60*2) {
			$age_str = floor($age/60);
			$age_str .= " min ago";
			$max_cache = min(60 - ($age % 60), (60*60*2) - $age);
		} else if ($age > 2) {
			$age_str = $age;
			$age_str .= " sec ago";
			$max_cache = 1;
		} else if ($age >= 0) {
			$age_str = "right now";
			$max_cache = 1;
		} else {
			$max_cache = -1;
		}
		if($age == 0) {
			$age_class = "noage";
		} else if ($age < 60*60*2) {
			$age_class = "age0";
		} else if ($age < 60*60*24*2) {
			$age_class = "age1";
		} else {
			$age_class = "age2";
		}
		
		return array("age_str" => $age_str, "age_class" => $age_class, "max_cache" => $max_cache);
	}
	
	public static function chop_text($text, $len, $add_len) {
		if(strlen($text) <= $len + $add_len)
			return $text;
		$ctext = substr($text, 0, $len);
		for($i = 0; $i < $add_len; $i++) {
			if($text[$len+$i] == ' ') 
				break;
			$ctext .= $text[$len+$i];
		}
		$ctext .= "...";
		return $ctext;
	}
	
	public static function parseTimeZone($timezone) {
		if(!preg_match("/^([+-])([0-9]{2})([0-9]{2})$/i", $timezone, $treffer))
			return 0;
		$offset = ($treffer[1] == '-' ? -1 : 1) * (($treffer[2] * 3600) + ($treffer[3] * 60));
		return $offset;
	}
	
}

?>