function round(value,precision)
{
	var exp = Math.pow(10,precision);
	
	return Math.round(value*exp)/exp;
}

function initialize()
{
	var option = document.createElement("option");
	option.value = "local";
	option.text = "lokalna";
	document.chooseForm.timestampTimezone.add(option);

	for(var zone = -720; zone <= 720; zone+=60)
	{
		var option = document.createElement("option");
		option.value = -zone;
		option.text = zone / 60;
		if(option.value == 0) option.text = "GMT";
		if(option.value < 0) option.text = "+" + option.text;
		document.chooseForm.timestampTimezone.add(option);
	}
	
	document.chooseForm.timestampUnix.value = Math.floor(Date.now() / 1000);
	document.chooseForm.timestampTimezone.value = "local";
	
	recalculate(document.chooseForm.timestampUnix);
}

//------tests
/*
 * zwykły pl zima: 1616014892 2021-03-17 22:01:32 loc (+1)
 * zwykły pl lato: 1592424742 2020-06-17 22:12:22 loc (+2) 
 * strefa          1616015700 2021-03-17 16:15:00 -5 (america/bogota)
 * strega          1616015700 2021-03-18 05:15:00 +8 (asia/hong kong)
 */

function recalculate(field)
{
	var form = field.form;
	
	if(field.id=="timestampUnix")
	{		
		var numberRegExp = new RegExp("^[0-9\.,]*$");		
		if(!numberRegExp.test(field.value))
			field.value = field.value.replace(/[^0-9\.,]*/ig,'');	

		var timestamp = field.value;
		if(form.timestampTimezone.value=="local")
		{
			var date = new Date(timestamp * 1000);
		
			form.timestampDate.value = date.getFullYear() + "-" + (date.getMonth()+1).toString().padStart(2,"0") + "-" + date.getDate().toString().padStart(2,"0");
			form.timestampTime.value = date.getHours().toString().padStart(2,"0") + ":" + date.getMinutes().toString().padStart(2,"0") + ":" + date.getSeconds().toString().padStart(2,"0");
		} else
		{
			timestamp -= form.timestampTimezone.value * 60;
		
			var date = new Date(timestamp * 1000);
		
			form.timestampDate.value = date.getUTCFullYear() + "-" + (date.getUTCMonth()+1).toString().padStart(2,"0") + "-" + date.getUTCDate().toString().padStart(2,"0");
			form.timestampTime.value = date.getUTCHours().toString().padStart(2,"0") + ":" + date.getUTCMinutes().toString().padStart(2,"0") + ":" + date.getUTCSeconds().toString().padStart(2,"0");
		}		
	}

	if(field.id=="timestampDate")
	{
		var dateCharsRegExp = RegExp("^[0-9\-]*$");
		if(!dateCharsRegExp.test(field.value))
			field.value = field.value.replace(/[^0-9\-]*/ig,'');	
	}

	if(field.id=="timestampTime")
	{
		var dateCharsRegExp = RegExp("^[0-9:]*$");
		if(!dateCharsRegExp.test(field.value))
			field.value = field.value.replace(/[^0-9:]*/ig,'');	
	}
	
	if(field.id=="timestampDate" || field.id=="timestampTime" || field.id=="timestampTimezone")
	{
		var dateString = form.timestampDate.value + " " + form.timestampTime.value;
		if(form.timestampTimezone.value != "local")
		{
			if(form.timestampTimezone.value == 0) 
				dateString += " GMT";
			else
			{
				dateString += " GMT";
				if(form.timestampTimezone.value>0)
					dateString += "-";
				else
					dateString += "+";
				dateString += (Math.abs(form.timestampTimezone.value)/60).toString().padStart(2,"0");
				dateString += "00";
			}
		}
		var date = Date.parse(dateString);
		if(!isNaN(date))
			form.timestampUnix.value = Math.floor(date / 1000);
	}
}

function selectInput(field)
{
	addClass(field,"input_selected");
	
	for(var i = 0; i < document.forms.length; i++)	
		for(var j = 0; j < document.forms[i].elements.length; j++)
   	{
			var currentElement = document.forms[i].elements[j];
		
			if(currentElement == field)
				continue;
			
			removeClass(currentElement,"input_selected");
		}
}

function addClass(item, classname) 
{
    var obj = item
    if (typeof item=="string") {
        obj = document.getElementById(item)
    }
    obj.className += " " + classname
}

function removeClass(item, classname) 
{
    var obj = item
    if (typeof item=="string") {
        obj = document.getElementById(item)
    }
    var classes = ""+obj.className
    while (classes.indexOf(classname)>-1) {
        classes = classes.replace (classname, "")
    }
    obj.className = classes
}

Number.prototype.toMoney = function(decimals, decimalSeparator, thousandsSeparator)
{ 
   var n = this;
   c = isNaN(decimals) ? 2 : Math.abs(decimals);
   d = decimalSeparator || '.';
   t = (typeof thousandsSeparator === 'undefined') ? ' ' : thousandsSeparator;
   sign = (n < 0) ? '-' : '',

   i = parseInt(n = Math.abs(n).toFixed(c)) + '', 
   j = ((j = i.length) > 3) ? j % 3 : 0; 

   return sign + (j ? i.substr(0, j) + t : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : ''); 
}

String.prototype.startsWith = function (str)
{
    return this.indexOf(str) == 0;
};