/******************************************************************************
 * http://ajas.us/
 * The way I want to do dates (Dec 7, 2006) rev. (May 14, 2007)
 * If you find an error, or improvement, let me know: dev at ajas dot us
 * This file is free for use
 *
 * I have not tested every date, but it seems to work for all the dates tested
 *
 * ajas.ui.magicDate()               - call this onblur, scrubs and validates
 * ajas.util.arraySearch()           - return first index of item in array
 * ajas.util.arrayFilter()           - filters array based on passed test function
 * ajas.validator.date.parseMonth()  - returns which single monthname a string represents
 * ajas.validator.date.parseWeekday()- returns which single dayname a string represents
 * ajas.validator.date.parse()       - don't call this
 * ajas.ui.magicDate_keyup()         - call this on keyup, handles special keys
 * ajas.validator.date.aMonthNames
 * ajas.validator.date.aWeekdayNames
 *
 * The function cancelBubble() is found in ajas.event.js
 *
 * based on:
 *  'Magic' date parsing, by Simon Willison (6th October 2003)
 *  http://simon.incutio.com/archive/2003/10/06/betterDateInput
 *****************************************************************************/

if(!ajas)var ajas={};
if(!ajas.ui)ajas.ui={};
if(!ajas.util)ajas.util={};
if(!ajas.validator)ajas.validator={};
if(!ajas.validator.time)ajas.validator.time={};

ajas.validator.time.aMonthNames = ["January","February","March","April","May","June","July","August","September","October","November","December"];
ajas.validator.time.aWeekdayNames = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];


// use this function for form feedback
ajas.ui.magicTime=function(oInput, b24) {
	// Set preferred defaults here.
	// b24 sets whether to use 24 hour clock
	if(arguments.length < 2) var b24=false;
	
	var sLabel = oInput.id + 'Msg';
	oInput.className = oInput.className.replace(/ajas_time_error/g, '');
	try {
		if (oInput.value == '') {
			document.getElementById(sLabel).innerHTML = b24?'HH:mm:ss':'hh:mm:ss am/pm';
			return;
		}
		var oDate = ajas.validator.time.parse(oInput.value,b24);
		var iHour=oDate.getHours();
		if(!b24)iHour%=12;
		if(!b24 && iHour == 0)iHour=12;
		var s='';
		if(iHour<10)s+='0';
		s+=iHour+':';
		if(oDate.getMinutes()<10)s+='0';
		s+=oDate.getMinutes()+':';
		if(oDate.getSeconds()<10)s+='0';
		s+=oDate.getSeconds();
		if(!b24)s+=oDate.getHours()>11?'pm':'am';
		
		oInput.value = s;
		// Human readable time
		document.getElementById(sLabel).innerHTML = s;
	} catch (e) {
		oInput.className += ' ajas_time_error';
		var message = e.message;
		// Fix for IE6 bug
		if (message.indexOf('is null or not an object') > -1) {
			message = 'Invalid time string';
		}
		document.getElementById(sLabel).innerHTML = message;
	}

}

ajas.validator.time.parse=function(sDate, b24) {
	if(arguments.length < 2) var b24=false;
	var aBits;
	var oDate = new Date();
	
	// Now
	if (aBits = /^now/i.exec(sDate)) {
		return oDate;
	}
	
	// Noon
	if (aBits = /^(12(00)?n|noon?|midd(ay?)?)/i.exec(sDate)) {
		oDate.setSeconds(0);
		oDate.setMinutes(0);
		oDate.setHours(12);
		return oDate;
	}
	// Midnight
	if (aBits = new RegExp('^'+sDate,'i').test('midnight')) {
		oDate.setSeconds(0);
		oDate.setMinutes(0);
		oDate.setHours(0);
		return oDate;
	}

	// 0530
	if (aBits = /^(\d{1,2})(\d{2})?(\d{2})?\s*(am?|pm?)?$/i.exec(sDate)) {
		var iHour=parseInt(aBits[1], 10);
		if (iHour > 23 || (iHour > 12 && !b24)){
			throw new Error("Invalid Hour");
		}
		var iMinute=parseInt(aBits[2], 10);
		if (iMinute > 59){
			throw new Error("Invalid Minute");
		}
		var iSecond=parseInt(aBits[3], 10);
		if (iSecond > 59){
			throw new Error("Invalid Second");
		}
		var iPM=0;
		if(aBits[4]){
			var iPM=aBits[4].toLowerCase().indexOf('p')>-1?12:0;
			if(iHour > 12){
				throw new Error("AM/PM on a 24-Hour clock?");
			}
			if(iHour == 12){
				iHour=0;
			}
		}
		if(!b24)iHour%=12;
		oDate.setSeconds(iSecond||0);
		oDate.setMinutes(iMinute||0);
		oDate.setHours(iHour+iPM);
		return oDate;
	}


	// hh:mm:ss
	if (aBits = /^(\d{1,2}):(\d{1,2})(:(\d{1,2}))?\s*(am?|pm?)?$/i.exec(sDate)) {
		var iHour=parseInt(aBits[1], 10);
		if (iHour > 23 || (iHour > 12 && !b24)){
			throw new Error("Invalid Hour");
		}
		var iMinute=parseInt(aBits[2], 10);
		if (iMinute > 59){
			throw new Error("Invalid Minute");
		}
		var iSecond=parseInt(aBits[4], 10);
		if (iSecond > 59){
			throw new Error("Invalid Second");
		}
		var iPM=0;
		if(aBits[5]){
			var iPM=aBits[5].toLowerCase().indexOf('p')>-1?12:0;
			if(iHour > 12){
				throw new Error("AM/PM on a 24-Hour clock?");
			}
			if(iHour == 12){
				iHour=0;
			}
		}
		if(!b24)iHour%=12;
		oDate.setSeconds(iSecond||0);
		oDate.setMinutes(iMinute||0);
		oDate.setHours(iHour+iPM);
		return oDate;
	}

	// now that I've checked what and how I want to check, let the JS API try what's left.
	if (milli = Date.parse(sDate)) { // is there a better way to do this?
		oDate.setSeconds(0);
		oDate.setMinutes(0);
		oDate.setHours(0);
		oDate.setDate(1);
		oDate.setFullYear(1970);
		oDate.setMonth(0); // Because months indexed from 0
		oDate.setMilliseconds(milli);
		return oDate;
	}
	
	// no date
	throw new Error("Enter a Valid Time.");
}

ajas.ui.magicTime_keyup=function(event,b24) {
	if(arguments.length < 2) var b24=false;

	event=event||window.event;
	var oInput=event.target||event.srcElement;
	if (false && "" == oInput.value){
		var oDate = new Date();
		oInput.value = oDate.getFullYear() + '-' + (oDate.getMonth() + 1) + '-' + oDate.getDate();
	} else {
		key = event.keyCode?event.keyCode:event.which;
		
		switch(key) {
		case 13: // enter
			oInput.blur();
			ajas.event.cancelBubble(event);
			return false;
			break;
		case 38: // up
			if (oInput.value == '') oInput.value='now';
			var oDate = ajas.validator.time.parse(oInput.value,b24);
			oDate.setHours(oDate.getHours() + 1);
			break;
		case 40: // down
			if (oInput.value == '') oInput.value='now';
			var oDate = ajas.validator.time.parse(oInput.value,b24);
			oDate.setHours(oDate.getHours() - 1);
			break;
		case 39: // right
			if (oInput.value != '') break;
			var oDate = new Date();
			break;
		default:
			return true;
		}
		if (oDate){
			var iHour=oDate.getHours();
			if(!b24)iHour%=12;
			if(!b24 && iHour == 0)iHour=12;
			var s='';
			if(iHour<10)s+='0';
			s+=iHour+':';
			if(oDate.getMinutes()<10)s+='0';
			s+=oDate.getMinutes()+':';
			if(oDate.getSeconds()<10)s+='0';
			s+=oDate.getSeconds();
			if(!b24)s+=oDate.getHours()>11?'pm':'am';
			
			oInput.value = s;
			// Human readable time
			document.getElementById(oInput.id+'Msg').innerHTML = s;
		}
	}
	return true;
}