<?
	ini_set('intl.default_locale', 'sv-SE');
	ini_set('display_errors', 1);
	
	function requireHttps() {
		if(empty($_SERVER['HTTPS'])) {
			header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
			exit();
		}
	}

	function requestOk($message) {
		requestFail($message, false, 200);
	}

	function requestParameterFail($message, $die = false) {
		requestFail($message, $die, 400);
	}

	function requestAuthFail($message, $die = false) {
		requestFail($message, $die, 403);
	}

	function requestFail($message, $die = false, $status = 500) {
		http_response_code($status);
		echo($message);
		if($die) {
			die();
		}
	}

	function getPageUrl($page = "") {
		global $currentPage;
		if($page == "") {
			$page = $currentPage;
		}
		return "?page=$page";
	}

	function getMandatoryRequestValue($var, $message = null) {
		$value = getOptionalRequestValue($var, null);
		if($value == null) {
			if($message != null) {
				requestParameterFail($message, true);
			} else {
				requestParameterFail("Missing request parameter \"$var\"", true);
			}
		} else {
			return $value;
		}
	}

	function getOptionalRequestValue($var, $defaultValue) {
		$sources = array($_GET, $_POST);

		foreach($sources as $data) {
			if(isset($data[$var]) && $data[$var] != null && $data[$var] != "") {
				return $data[$var];
			}
		}
		return $defaultValue;
	}

	function isPostSet($var) {
		return (isset($_POST[$var]) && $_POST[$var] != "");
	}

	function time2str($ts) {
	    if(!ctype_digit($ts))
	        $ts = strtotime($ts);

	    $diff = time() - $ts;
	    if($diff == 0)
	        return 'now';
	    elseif($diff > 0)
	    {
	        $day_diff = floor($diff / 86400);
	        if($day_diff == 0)
	        {
	            if($diff < 60) return 'just now';
	            if($diff < 120) return '1 minute ago';
	            if($diff < 3600) return floor($diff / 60) . ' minutes ago';
	            if($diff < 7200) return '1 hour ago';
	            if($diff < 86400) return floor($diff / 3600) . ' hours ago';
	        }
	        if($day_diff == 1) return 'Yesterday';
	        if($day_diff < 7) return $day_diff . ' days ago';
	        if($day_diff < 31) return ceil($day_diff / 7) . ' weeks ago';
	        if($day_diff < 60) return 'last month';
	        return date('F Y', $ts);
	    }
	    else
	    {
	        $diff = abs($diff);
	        $day_diff = floor($diff / 86400);
	        if($day_diff == 0)
	        {
	            if($diff < 120) return 'in a minute';
	            if($diff < 3600) return 'in ' . floor($diff / 60) . ' minutes';
	            if($diff < 7200) return 'in an hour';
	            if($diff < 86400) return 'in ' . floor($diff / 3600) . ' hours';
	        }
	        if($day_diff == 1) return 'Tomorrow';
	        if($day_diff < 4) return date('l', $ts);
	        if($day_diff < 7 + (7 - date('w'))) return 'next week';
	        if(ceil($day_diff / 7) < 4) return 'in ' . ceil($day_diff / 7) . ' weeks';
	        if(date('n', $ts) == date('n') + 1) return 'next month';
	        return date('F Y', $ts);
	    }
	}

	function bytes2str($bytes) {
		$si_prefix = array('B', 'kB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB');
		$base = 1024;
		$class = min((int)log($bytes, $base) , count($si_prefix) - 1);
		return sprintf("%1.2f" , $bytes / pow($base, $class))." ".$si_prefix[$class];
	}

	function seconds2str($seconds) {
		$multiplier = array(1, 60, 60, 24, 7, 4.3482, 12);
		//$unit = array("s", "m", "h", "d", "w", "m", "y");
		$unit = array("sekunder", "minuter", "timmar", "dagar", "veckor", "månader", "år");

		$time = $seconds;
		$i = 0;
		for(; $i < count($multiplier); $i++) {
			$time = $time / $multiplier[$i];
			if(($i == count($multiplier) - 1) || abs($time) < $multiplier[$i+1]) {
				break;
			}
		}
		if($i == 0) {
			return intval($time)." ".$unit[$i];
		} else {
			return intval($time)." ".$unit[$i]." & ".intval(($time - intval($time))*$multiplier[$i])." ".$unit[$i-1];
		}
	}

	function getColor($seed) {
		mt_srand($seed*5);
		return sprintf('#%06X', mt_rand(0, 0xFFFFFF));
	}

	function toTwoDigits($i) {
		return intval($i / 10).($i % 10);
	}

	function getMonthStr($i) {
		$months = array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
		return $months[$i - 1];
	}

	function formatDate($year, $month, $day) {
		return $year."-".toTwoDigits($month)."-".toTwoDigits($day);
	}

	function createPasswordSalt() {
		return rand(1000, 9999);
	}

	function createPasswordHash($password, $salt) {
		return md5($password.$salt);
	}

?>