// JavaScript Document
function submitNewGig(){
	var gigDate = document.getElementById('gigDate');
	var gigTown = document.getElementById('gigTown');
	var gigVenue = document.getElementById('gigVenue');
	var gigContinent = document.getElementById('gigContinent');
	var gigBands = document.getElementById('gigBands');
	if (gigDate.value.indexOf('/') != false){
		var tempDate = gigDate.value.split('/');
		if ((tempDate.length == 3) && (tempDate[2].length == 2)){
			gigDate.value = tempDate[0] + '/' + tempDate[1] + '/20' + tempDate[2];
		}
	}
	if (!isAfterToday(gigDate.value)){
		alert('You must include the date in UK format (dd/mm/yyyy).');
		gigDate.focus();
		return false;	
	}
	
	if (!gigTown.value){
		alert('You must include the town.');
		gigTown.focus();
		return false;
	}
	
	if (!gigVenue.value){
		alert('You must include the venue.');
		gigVenue.focus();
		return false;
	}
	
	if (!gigContinent.value){
		alert('You must include the continent.');
		gigContinent.focus();
		return false;
	}

	if (!gigBands.value){
		alert('You must include the bands! You bozo!' + "\n" + 'Please separate bands with a \'+\' like "Damned + Cock Sparrer".');
		gigBands.focus();
		return false;
	}

	
	//document.getElementById('newGigForm').submit();
	return true;
}

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var dtCh= "/";
	var minYear=1900;
	var maxYear=2100;
	
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
	return true
}

function isAfterToday(date){
	if (!isDate(date)) return false;
	var today = new Date();
	var theDate = new Date();
	var dateArray = date.split('/');
	theDate.setDate(dateArray[0]);
	theDate.setMonth(dateArray[1]-1);
	theDate.setFullYear(dateArray[2]);
	if (theDate.getTime() < today.getTime()){
		alert("Wake up, that already happened. (We wont add gigs that have already happened)");
		return false;	
	}
	return true;
}

function submitGigSearch(){
	var gigDate = document.getElementById('gigDate');
	var gigDate2 = document.getElementById('gigDate2');
	var gigTown = document.getElementById('gigTown');
	var gigVenue = document.getElementById('gigVenue');
	var gigContinent = document.getElementById('gigContinent');
	var gigBands = document.getElementById('gigBands');
	var gigPromoter = document.getElementById('gigPromoter');
	var gigRegion = document.getElementById('gigRegion');
	
	var dest = '';
	var added = false;
	if (gigDate.value){
		if (isDate(gigDate.value)){
			if (added == true) dest += '/';
			dest += 'from/' + escape(gigDate.value.replace(/\//g,'-',2));
			added = true;
		}else{
			gigDate.focus();
			return false;
		}
	}
	if (gigDate2.value){
		if (isDate(gigDate2.value)){
			if (added == true) dest += '/';
			dest += 'to/' + escape(gigDate2.value.replace(/\//g,'-',2));
			added = true;
		}else{
			gigDate2.focus();
			return false;
		}
	}
	if (gigContinent.value){
		if (added == true) dest += '/';
		dest += 'continentID/' + escape(gigContinent.value);
		added = true;
	}
	if (gigRegion.value){
		if (added == true) dest += '/';
		dest += 'region/' + escape(gigRegion.value);
		added = true;
	}
	if (gigTown.value){
		if (added == true) dest += '/';
		dest += 'in/' + escape(gigTown.value);
		added = true;
	}
	if (gigVenue.value){
		if (added == true) dest += '/';
		dest += 'in/' + escape(gigVenue.value);
		added = true;
	}
	if (gigBands.value){
		if (added == true) dest += '/';
		dest += 'by/' + escape(gigBands.value);
		added = true;
	}
	if (gigPromoter.value){
		if (added == true) dest += '/';
		dest += 'promoter/' + escape(gigPromoter.value);
		added = true;
	}
	if (added == true){
		document.getElementById('gigSearchForm').action = 'gigs/' + dest;
	//	document.getElementById('gigSearchForm').submit();
		return true;
	}
	return false;
}
function submitSiteSearch(){
	var searchPhrase = document.getElementById('searchWords').value;
	if (searchPhrase){
		document.getElementById('siteSearchForm').action = 'site-search/' + searchPhrase.replace(/ /g,'/');
		//document.getElementById('siteSearchForm').submit();
		return true;
	}
	return false;
}
function changeImage(obj,image){
	try{
		document.getElementById(obj).src = image;	
	} catch (e) {
		try{
			obj.src = image;
		} catch (e) {
			return;	
		}
	}
	return;
}

function submitContact(){
	if (document.getElementById('from').value == ''){
		alert('Tell us your name.');
		document.getElementById('from').focus();
		return false;
	}
	if (document.getElementById('message').value == ''){
		alert('Please type in your message');
		document.getElementById('message').focus();
		return false;
	}
	return true;
}

function getValue(obj){
	try{
		return document.getElementById(obj).value;
	}catch(e){
		return false;	
	}
}
function submitGigFilter(){
	var silentForm = document.getElementById('silentForm');
	var gigContinent = getValue('gigContinent');
	var added = false;
	var dest = '';
	if (gigContinent){
		if (added == true) dest += '/';
		dest += 'continent/' + escape(gigContinent);
		added = true;
	}

	var gigRegion = getValue('gigRegion');	
	if (gigRegion){
		if (added == true) dest += '/';
		dest += 'region/' + escape(gigRegion);
		added = true;
	}

	var gigTown = getValue('gigTown');
	if (gigTown){
		if (added == true) dest += '/';
		dest += 'in/' + escape(gigTown);
		added = true;
	}
	
	var gigVenue = getValue('gigVenue');
	if (gigVenue){
		if (added == true) dest += '/';
		dest += 'at/' + escape(gigVenue);
		added = true;
	}

	var gigBands = getValue('gigBand');
	if (gigBands){
		if (added == true) dest += '/';
		dest += 'by/' + escape(gigBands);
		added = true;
	}
	
	
	if (added == true){
		silentForm.action = 'gigs/' + dest;
		return true;
	}
	return false;
}
function refreshQuickFilter(){
	var dest = '';
	var added = false;
	
	var gigContinent = getValue('gigContinent');
	if (gigContinent){
		if (added == true) dest += '&';
		dest += 'gigContinent=' + escape(gigContinent);
		added = true;
	}

	var gigRegion = getValue('gigRegion');	
	if (gigRegion){
		if (added == true) dest += '&';
		dest += 'gigRegion=' + escape(gigRegion);
		added = true;
	}

	var gigTown = getValue('gigTown');
	if (gigTown){
		if (added == true) dest += '&';
		dest += 'gigTown=' + escape(gigTown);
		added = true;
	}
	
	var gigVenue = getValue('gigVenue');
	if (gigVenue){
		if (added == true) dest += '&';
		dest += 'gigVenue=' + escape(gigVenue);
		added = true;
	}

	var gigBands = getValue('gigBand');
	if (gigBands){
		if (added == true) dest += '&';
		dest += 'gigBand=' + escape(gigBands);
		added = true;
	}
	
	
	if (added == true){
		var xmlHttp = createSocket();
		if (checkSocket(xmlHttp) == false) return false;
			
		xmlHttp.onreadystatechange=function(){
			if(xmlHttp.readyState==4) {
				//do nothing
				document.getElementById('quickGigFilter').innerHTML = xmlHttp.responseText;
			}
		}
		//document.getElementById('quickGigFilter').innerHTML = 'Refreshing...';
		xmlHttp.open("GET","ajax/refreshQuickFilter.php?" + dest,true);
/*		xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
   		xmlHttp.setRequestHeader("Content-length", dest.length);
	   	xmlHttp.setRequestHeader("Connection", "close");*/
		xmlHttp.send(null);
		return true;
	}
	return false;
}