/*
 * Calendar for
 * JQuery
 * Manuel Garcia (thekeeper)
 * http://www.mgarcia.info
 * Version 0.2
 *
 * Copyright (c) 2007 Manuel Garcia
 * http://www.opensource.org/licenses/mit-license.php
 */


jQuery.calendar = function (el,open,Config) {
	jQuery.calendar.initialize(el);
}

Element = function (el) {
	return jQuery("<"+el+">");
}

jQuery.extend(jQuery.calendar, {

      initialize: function(el,open,Config) {
      this.input = $(el);
			var lng = new Object();

			// Firefox? IE ?
			try {  var nav = navigator.language.substr(0,2); }
			catch (e)	{ var nav = navigator.userLanguage;}
		  	lng['pl'] = {
	      					month : ['Styczeń', 'Luty', 'Marzec', 'Kwiecień', 'Maj', 'Czerwiec', 'Lipiec', 'Sierpień', 'Wrzesień', 'Październik', 'Listopad', 'Grudzień'],
							day : ['Pn','Wt','Śr','Czw','Pt','S','N'],
							first: 1 // Sunday
	      	};
	  
      		lng['en'] = {
      						month : ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
							day : ['S','M','T','W','T','F','S'],
							first: 0 // Sunday
      		};

	  		lng = (!lng[nav])? lng['en'] : lng =  lng[nav] ;
      		/* configuration */
      		if (!Config)
	      		this.config = {
						Lng: lng,
					  	imgNext: 'images/next.png',
					  	imgPrev: 'images/prev.png',
					 	imgCancel: 'images/cancel.gif'
				};

      		this.month_name = this.config.Lng.month;
      		this.day_name =  this.config.Lng.day;
			this.create_calendar();
    },
    findPos: function (obj) {
  	  	var curleft = curtop = 0;
  	  	if (obj.offsetParent) {
  			curleft = obj.offsetLeft
  			curtop = obj.offsetTop
  			while (obj = obj.offsetParent) {
  				curleft += obj.offsetLeft
  				curtop += obj.offsetTop
  			}
  	  	}
  	   	return [curleft,curtop];
    },
    create_calendar: function() {

     	var position = this.input;
     	if ($('#ncalendar'))  $('#ncalendar').remove();

      	// content div  //

      	this.div = new Element('div')
			.css({
      	'top':'20',
      	'left':position.left})
			.attr('id', 'ncalendar');
			
      	this.nav();
      	this.setdate(this.input.attr('value'));
			//this.effect(this.div,'show');
		} ,
	nav: function (today) {
		  // nav
    	this.calendardiv = new Element('div').appendTo(this.div);
    	this.title = new Element('div')
    	.css({'display':'inline','font-weight':'bold'})
		.appendTo(this.calendardiv);
    	// next month
    	this.next = new Element('img').attr('src', this.config.imgNext).insertAfter(this.title);
    	// before month
    	this.before = new Element('img').attr('src', this.config.imgPrev).insertBefore(this.title);
		// close
		this.close = new Element('img').attr('src', this.config.imgCancel).insertAfter(this.next);
		// table
		this.table = new Element('table').appendTo(this.calendardiv);
		var thead = new Element('thead').appendTo(this.table);
   		var tr = new Element('tr').appendTo(thead);

      	jQuery.each(this.day_name, function(day,el) {
				var td = new Element('th').html(el).appendTo(tr);
	  	});
			
		var localThis = this;
			this.close.click(function(e) {
          localThis.div.remove();
  		});
	},
	setdate : function(date) {
			// reset event nav
		this.next.unbind( "click" );
		this.before.unbind( "click" );

		if (!this.validate_date(date)) {
			
        	this.today = new Date();
		    this.today.setDate(1);
		    
      	} else {
      		var dateinp = date.split('-');

    		this.today = new Date(dateinp[0],dateinp[1]-1,dateinp[2]);
    		
		}
      	this.next_m = this.today.getMonth();
      	this.next_m++;

      	this.title.html(this.month_name[this.today.getMonth()]+' ' + this.today.getFullYear());
  		var localThis = this;

			// event next
		this.next.click(function(e) {
         	var date = localThis.today;
         	
     	 	date.setMonth(localThis.next_m+1,1);
	        localThis.tbody.remove();
          	localThis.setdate(date.getFullYear() +'-'+ date.getMonth() +'-'+ date.getDate());
          	
  		});
  		// event before
		this.before.click(function(e) {
          	var date = localThis.today;
     	    date.setMonth(localThis.next_m-1,1);
          	localThis.tbody.remove();
          	localThis.setdate(date.getFullYear() +'-'+ date.getMonth() +'-'+ date.getDate());
  		});
		
		var LastMonth = new Date(this.today.getFullYear(),this.next_m-2,1,0,0,0);
		var last = LastMonth.getMonth();
			// total days the last month
		var counter = 0;
		for (var b = 1; b <= 31; b++) {
			LastMonth.setDate(b);
 			if ( LastMonth.getMonth() == last) {
 				  counter++;
 			}
		}

		this.tbody = new Element('tbody').appendTo(this.table);
		var first_day = this.today;
		var last_day = this.today;
		this.month = this.today.getMonth();
   		var tr = new Element('tr').appendTo(this.tbody);
  		var day=0;

		/* first day week */
		first_day.setDate(1);
		var rest = (!first_day.getDay())? 6: first_day.getDay()-1;
		counter = counter - rest;
		for (var i= this.config.Lng.first; i <= 6; i++) {
			if (first_day.getDay() == i) {
			    break;
      	 	} else {
				counter++;
				LastMonth.setDate(counter);
				if (LastMonth.getMonth() == this.today.getMonth()) LastMonth.setMonth(this.today.getMonth()-1);
      	  		this.create_td(tr,counter,LastMonth,'noday');
        	}
   		}
		(this.config.Lng.first)? brea_k = 1:brea_k = 0;
		
   		/* everydays */
      	var date_s = this.today;
     	var class_Css;
      	var brea_k; // breaking week
  	  	var daycounter = 0;
     	for (var i = 1; i <= 31; i++) {
    		date_s.setDate(i);
 			if (date_s.getMonth() == this.month) {
       			daycounter++;
		      	if (date_s.getDay() == brea_k) {
					var tr = new Element('tr').appendTo(this.tbody);
				}
          		class_Css = (!date_s.getDay())? 'sunday' : '';
				this.create_td(tr,i,date_s,class_Css);
			}
		}
		this.today.setMonth(this.month);
       	this.today.setDate(daycounter);
       	var NextMonth = new Date(this.today.getFullYear(),this.today.getMonth()+1,1,0,0,0);
		// finish month
		var num = date_s.getDay();
		num = (brea_k)? 7 - num: 6 - num;
		var b;
		b = (brea_k)? 0 : 6 ;
        if (this.today.getDay() != b) {
			for (var i= 1; i <= (num); i++) {
				NextMonth.setDate(i);
				this.create_td(tr,i,NextMonth,'noday');
			}
    	}
    	this.div.insertAfter($(this.input));
    },
	
	create_td: function(tr,i,date,class_Css) {
        var localThis = this;
		var td = new Element('td');
		if (date) {
			var dia = date.getDate();
			var mes = (date.getMonth()+1);
			//  9 to 09 or another number <= 9
			if (dia <= 9) dia = "0"+ dia;
			if (mes <= 9) mes = "0"+ mes;
        	td.attr('id', dia + '-'+ mes +'-'+	date.getFullYear());
        }
        td.click(function(e) {
       		var day = td.attr('id');
       		$(localThis.input).attr('value',day);
			localThis.effect(localThis.div,'fade');
			localThis.div.remove();
  		});
  			
  		td.mouseover(function(e) {
			td.addClass('dayselected');
  		});
  		td.mouseout(function(e) {
			td.removeClass('dayselected');
  		});

    	if (class_Css) td.addClass(class_Css);
    	// Today ??
    	var today = new Date();
		today = today.getFullYear() + "-" + (today.getMonth()+1) + "-" + today.getDate();
		if (date) var date_td = date.getFullYear() + "-" + (date.getMonth()+1) + "-" + date.getDate()  ;
		if (today == date_td) td.addClass('isToday');

  		td.html(i);
		td.appendTo(tr);
	},
	effect: function(div,op) {
		  if (op == 'fade') {
		    $(div).hide("slow");
		  } else {
		    $(div).show("slow");
		  }
	},
	validate_date: function (date) {

		  var regex = /^(\d{4})-(\d{1,2})-(\d{1,2})$/;
		 
		  return (date.match(new RegExp(regex)) == null)? false: true;
	}
});