/**
* Filename.......: calendar.js
* Project........: Popup Calendar
* Last Modified..: $Date: 2006/09/11 20:13:54 $
* CVS Revision...: $Revision: 1.1 $
* Copyright......: 2001, 2002 Richard Heyes
*
* Enhancements...: 17/03/2007 Oliver Georgi, http://www.phpwcms.de
*                  - detect browser language
*                  - set calendar month and dayname based on given language
*/

/**
* Global variables
*/
	dynCalendar_layers          = new Array();
	dynCalendar_mouseoverStatus = false;
	dynCalendar_mouseX          = 0;
	dynCalendar_mouseY          = 0;

/**
* The calendar constructor
*
* @access public
* @param string objName      Name of the object that you create
* @param string callbackFunc Name of the callback function
* @param string OPTIONAL     Optional layer name
* @param string OPTIONAL     Optional images path
*/
	function dynCalendar(objName, callbackFunc)
	{
		/**
        * Properties
        */
		// Todays date
		this.today          = new Date();
		this.date           = this.today.getDate();
		this.month          = this.today.getMonth();
		this.year           = this.today.getFullYear();

		this.objName        = objName;
		this.callbackFunc   = callbackFunc;
		this.imagesPath     = arguments[2] ? arguments[2] : 'images/';
		this.layerID        = arguments[3] ? arguments[3] : 'dynCalendar_layer_' + dynCalendar_layers.length;
		this.imgID        	= arguments[3] ? 'img'+arguments[3] : 'dynCalendar_img_' + dynCalendar_layers.length;

		this.offsetX        = 5;
		this.offsetY        = 5;

		this.useMonthCombo  = true;
		this.useYearCombo   = true;
		this.yearComboRange = 5;

		this.currentMonth   = this.month;
		this.currentYear    = this.year;

		/**
        * Public Methods
        */
		this.show              = dynCalendar_show;
		this.writeHTML         = dynCalendar_writeHTML;

		// Accessor methods
		this.setOffset         = dynCalendar_setOffset;
		this.setOffsetX        = dynCalendar_setOffsetX;
		this.setOffsetY        = dynCalendar_setOffsetY;
		this.setImagesPath     = dynCalendar_setImagesPath;
		this.setMonthCombo     = dynCalendar_setMonthCombo;
		this.setYearCombo      = dynCalendar_setYearCombo;
		this.setCurrentMonth   = dynCalendar_setCurrentMonth;
		this.setCurrentYear    = dynCalendar_setCurrentYear;
		this.setYearComboRange = dynCalendar_setYearComboRange;

		/**
        * Private methods
        */
		// Layer manipulation
		this._getLayer         = dynCalendar_getLayer;
		this._hideLayer        = dynCalendar_hideLayer;
		this._showLayer        = dynCalendar_showLayer;
		this._setLayerPosition = dynCalendar_setLayerPosition;
		this._setHTML          = dynCalendar_setHTML;

		// Miscellaneous
		this._getDaysInMonth   = dynCalendar_getDaysInMonth;
		this._mouseover        = dynCalendar_mouseover;

		/**
        * Constructor type code
        */
		dynCalendar_layers[dynCalendar_layers.length] = this;
		this.writeHTML();
	}

/**
* Shows the calendar, or updates the layer if
* already visible.
*
* @access public
* @param integer month Optional month number (0-11)
* @param integer year  Optional year (YYYY format)
*/
	function dynCalendar_show()
	{
		// Variable declarations to prevent globalisation
		var month, year, monthnames, numdays, thisMonth, firstOfMonth;
		var ret, row, i, cssClass, linkHTML, previousMonth, previousYear;
		var nextMonth, nextYear, prevImgHTML, prevLinkHTML, nextImgHTML, nextLinkHTML;
		var monthComboOptions, monthCombo, yearComboOptions, yearCombo, html;
		
		this.currentMonth = month = arguments[0] != null ? arguments[0] : this.currentMonth;
		this.currentYear  = year  = arguments[1] != null ? arguments[1] : this.currentYear;
		
		var browserLang   = navigator.language ? navigator.language : navigator.userLanguage;
		if(browserLang) {
			browserLang = browserLang.substr(0,2);
			browserLang = browserLang.toLowerCase();
		} else {
			browserLang = 'en';
		}
		switch(browserLang) {
			
			case 'de': // German
				monthnames = new Array('Januar','Februar','M&auml;rz','April','Mai','Juni','Juli','August','September','Oktober','November','Dezember');
				daynames   = new Array('So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa');
				break;
			case 'no': // Norwegian
				monthnames = new Array('Januar','Februar','Mars','April','Mai','Juni','Juli','August','September','Oktober','November','Desember');
				daynames   = new Array('S&oslash;n','Man','Tir','Ons','Tor','Fre','L&oslash;r');
				break;
			case 'nl': // Dutch
				monthnames = new Array('Januari','Februari','Maart','April','Mei','Juni','Juli','Augustus','September','Oktober','November','December');
				daynames   = new Array('Zo','Ma','Di','Wo','Do','Vr','Za');
				break;
			case 'es': // Spanish
				monthnames = new Array('Enero','Febrero','Marzo','April','Mayo','Junio','Julio','Agosto','Septiembre','Octubre','Noviembre','Diciembre');
				daynames   = new Array('Dom','Lun','Mar','Mie','Jue','Vie','Sab');
				break;
			case 'pt': // Portuguese
				monthnames = new Array('Janeiro','Fevereiro','Mar&ccedil;o','Abril','Maio','Junho','Julho','Agosto','Setembro','Outubro','Novembro','Dezembro');
				daynames   = new Array('Dom','Seg','Ter','Qua','Qui','Sex','S&aacute;b');
				break;
			case 'fr': // French
				monthnames = new Array('Janvier','F&eacute;vrier','Mars','Avril','Mai','Juin','Juillet','Ao&ucirc;t','Septembre','Octobre','Novembre','D&eacute;cembre');
				daynames   = new Array('Dim','Lun','Mar','Mer','Jeu','Ven','Sam');
				break;
			case 'da': // Danish
				monthnames = new Array('januar','februar','marts','april','maj','juni','juli','august','september','oktober','november','december');
				daynames   = new Array('s&oslash;n','man','tirs','ons','tors','fre','l&oslash;r');
				break;
			case 'hu': // Hungarian
				monthnames = new Array('janu&aacute;r','febru&aacute;r','m&aacute;rcius','&aacute;prilis','m&aacute;jus','j&uacute;nius','j&uacute;lius','augusztus','szeptember','okt&oacute;ber','november','december');
				daynames   = new Array('vas','h&eacute;','ke','sze','cs','p&eacute;','szo');
				break;
			case 'it': // Italian
				monthnames = new Array('Gennaio','Febbraio','Marzo','Aprile','Maggio','Giugno','Luglio','Agosto','Settembre','Ottobre','Novembre','Dicembre');
				daynames   = new Array('Dom','Lun',';Mar','Mer','Gio','Ven','Sab');
				break;
			case 'se': // Swedish
				monthnames = new Array('Januari','Februari','Mars','April','Maj','Juni','Juli','Augusti','September','Oktober','November','December');
				daynames   = new Array('S&ouml;n','M&aring;n','Tis','Ons','Tor','Fre','L&ouml;r');
				break;
			default: //english
				monthnames = new Array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December');
				daynames   = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
			
		}
		
		numdays    = this._getDaysInMonth(month, year);

		thisMonth    = new Date(year, month, 1);
		firstOfMonth = thisMonth.getDay();

		// First few blanks up to first day
		ret = new Array(new Array());
		for(i=0; i<firstOfMonth; i++){
			ret[0][ret[0].length] = '<td>&nbsp;</td>';
		}

		// Main body of calendar
		row = 0;
		i   = 1;
		while(i <= numdays){
			if(ret[row].length == 7){
				ret[++row] = new Array();
			}

			/**
            * Generate this cells' HTML
            */
			cssClass = (i == this.date && month == this.month && year == this.year) ? 'dynCalendar_today' : 'dynCalendar_day';
			linkHTML = '<a href="javascript: ' + this.callbackFunc + '(' + i + ', ' + (Number(month) + 1) + ', ' + year + '); ' + this.objName + '._hideLayer()">' + (i++) + '</a>';
			ret[row][ret[row].length] = '<td align="center" class="' + cssClass + '">' + linkHTML + '</td>';
		}

		// Format the HTML
		for(i=0; i<ret.length; i++){
			ret[i] = ret[i].join('\n') + '\n';
		}

		previousYear  = thisMonth.getFullYear();
		previousMonth = thisMonth.getMonth() - 1;
		if(previousMonth < 0){
			previousMonth = 11;
			previousYear--;
		}
		
		nextYear  = thisMonth.getFullYear();
		nextMonth = thisMonth.getMonth() + 1;
		if(nextMonth > 11){
			nextMonth = 0;
			nextYear++;
		}

		prevImgHTML  = '<img src="' + this.imagesPath + '/prev.gif" alt="<<" border="0" />';
		prevLinkHTML = '<a href="javascript: ' + this.objName + '.show(' + previousMonth + ', ' + previousYear + ')">' + prevImgHTML + '</a>';
		nextImgHTML  = '<img src="' + this.imagesPath + '/next.gif" alt="<<" border="0" />';
		nextLinkHTML = '<a href="javascript: ' + this.objName + '.show(' + nextMonth + ', ' + nextYear + ')">' + nextImgHTML + '</a>';

		/**
        * Build month combo
        */
		if (this.useMonthCombo) {
			monthComboOptions = '';
			for (i=0; i<12; i++) {
				selected = (i == thisMonth.getMonth() ? 'selected="selected"' : '');
				monthComboOptions += '<option value="' + i + '" ' + selected + '>' + monthnames[i] + '</option>';
			}
			monthCombo = '<select name="months" onchange="' + this.objName + '.show(this.options[this.selectedIndex].value, ' + this.objName + '.currentYear)">' + monthComboOptions + '</select>';
		} else {
			monthCombo = monthnames[thisMonth.getMonth()];
		}
		
		/**
        * Build year combo
        */
		if (this.useYearCombo) {
			yearComboOptions = '';
			for (i = thisMonth.getFullYear() - this.yearComboRange; i <= (thisMonth.getFullYear() + this.yearComboRange); i++) {
				selected = (i == thisMonth.getFullYear() ? 'selected="selected"' : '');
				yearComboOptions += '<option value="' + i + '" ' + selected + '>' + i + '</option>';
			}
			yearCombo = '<select name="years" onchange="' + this.objName + '.show(' + this.objName + '.currentMonth, this.options[this.selectedIndex].value)">' + yearComboOptions + '</select>';
		} else {
			yearCombo = thisMonth.getFullYear();
		}

		html = '<table border="0" cellpadding="0" cellspacing="0" class="dynCalendar_table" summary="">';
		html += '<tr><td class="dynCalendar_header">' + prevLinkHTML + '</td><td colspan="5" align="center" class="dynCalendar_header">' + monthCombo + ' ' + yearCombo + '</td><td align="right" class="dynCalendar_header">' + nextLinkHTML + '</td></tr>';
		html += '<tr>';
		html += '<td class="dynCalendar_dayname">'+daynames[0]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[1]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[2]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[3]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[4]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[5]+'</td>';
		html += '<td class="dynCalendar_dayname">'+daynames[6]+'</td></tr>';
		html += '<tr>' + ret.join('</tr>\n<tr>') + '</tr>';
		html += '</table>';

		this._setHTML(html);
		if (!arguments[0] && !arguments[1]) {
			this._showLayer();
			this._setLayerPosition();
		}
	}

/**
* Writes HTML to document for layer
*
* @access public
*/
	function dynCalendar_writeHTML()
	{
		// expect modern browser
		//if (is_ie5up || is_nav6up || is_gecko) {
			document.write('<a href="javascript: ' + this.objName + '.show()"><img src="' + this.imagesPath + 'dynCalendar.gif" border="0" id="' + this.imgID + '" /></a>');
			document.write('<div class="dynCalendar" id="' + this.layerID + '" onmouseover="' + this.objName + '._mouseover(true)" onmouseout="' + this.objName + '._mouseover(false)"></div>');
		//}
	}

/**
* Sets the offset to the mouse position
* that the calendar appears at.
*
* @access public
* @param integer Xoffset Number of pixels for vertical
*                        offset from mouse position
* @param integer Yoffset Number of pixels for horizontal
*                        offset from mouse position
*/
	function dynCalendar_setOffset(Xoffset, Yoffset)
	{
		this.setOffsetX(Xoffset);
		this.setOffsetY(Yoffset);
	}

/**
* Sets the X offset to the mouse position
* that the calendar appears at.
*
* @access public
* @param integer Xoffset Number of pixels for horizontal
*                        offset from mouse position
*/
	function dynCalendar_setOffsetX(Xoffset)
	{
		this.offsetX = Xoffset;
	}

/**
* Sets the Y offset to the mouse position
* that the calendar appears at.
*
* @access public
* @param integer Yoffset Number of pixels for vertical
*                        offset from mouse position
*/
	function dynCalendar_setOffsetY(Yoffset)
	{
		this.offsetY = Yoffset;
	}
	
/**
* Sets the images path
*
* @access public
* @param string path Path to use for images
*/
	function dynCalendar_setImagesPath(path)
	{
		this.imagesPath = path;
	}

/**
* Turns on/off the month dropdown
*
* @access public
* @param boolean useMonthCombo Whether to use month dropdown or not
*/
	function dynCalendar_setMonthCombo(useMonthCombo)
	{
		this.useMonthCombo = useMonthCombo;
	}

/**
* Turns on/off the year dropdown
*
* @access public
* @param boolean useYearCombo Whether to use year dropdown or not
*/
	function dynCalendar_setYearCombo(useYearCombo)
	{
		this.useYearCombo = useYearCombo;
	}

/**
* Sets the current month being displayed
*
* @access public
* @param boolean month The month to set the current month to
*/
	function dynCalendar_setCurrentMonth(month)
	{
		this.currentMonth = month;
	}

/**
* Sets the current month being displayed
*
* @access public
* @param boolean year The year to set the current year to
*/
	function dynCalendar_setCurrentYear(year)
	{
		this.currentYear = year;
	}

/**
* Sets the range of the year combo. Displays this number of
* years either side of the year being displayed.
*
* @access public
* @param integer range The range to set
*/
	function dynCalendar_setYearComboRange(range)
	{
		this.yearComboRange = range;
	}

/**
* Returns the layer object
*
* @access private
*/
	function dynCalendar_getLayer()
	{
		var layerID = this.layerID;

		if (document.getElementById(layerID)) {

			return document.getElementById(layerID);

		} else if (document.all(layerID)) {
			return document.all(layerID);
		}
	}

/**
* Hides the calendar layer
*
* @access private
*/
	function dynCalendar_hideLayer()
	{
		this._getLayer().style.visibility = 'hidden';
	}

/**
* Shows the calendar layer
*
* @access private
*/
	function dynCalendar_showLayer()
	{
		this._getLayer().style.visibility = 'visible';
	}

/**
* Sets the layers position
*
* @access private
*/
	function dynCalendar_setLayerPosition()
	{
		
		//alert(document.getElementById(this.imgID).style.top);
		this._getLayer().style.top  = (dynCalendar_mouseY + this.offsetY) + 'px';
		this._getLayer().style.left = (dynCalendar_mouseX + this.offsetX) + 'px';
		
	}

/**
* Sets the innerHTML attribute of the layer
*
* @access private
*/
	function dynCalendar_setHTML(html)
	{
		this._getLayer().innerHTML = html;
	}

/**
* Returns number of days in the supplied month
*
* @access private
* @param integer month The month to get number of days in
* @param integer year  The year of the month in question
*/
	function dynCalendar_getDaysInMonth(month, year)
	{
		monthdays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
		if (month != 1) {
			return monthdays[month];
		} else {
			return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0 ? 29 : 28);
		}
	}

/**
* onMouse(Over|Out) event handler
*
* @access private
* @param boolean status Whether the mouse is over the
*                       calendar or not
*/
	function dynCalendar_mouseover(status)
	{
		dynCalendar_mouseoverStatus = status;
		return true;
	}

/**
* onMouseMove event handler
*/
	dynCalendar_oldOnmousemove = document.onmousemove ? document.onmousemove : new Function;

	document.onmousemove = function ()
	{
		// expect modern browser
		//if (is_ie5up || is_nav6up || is_gecko) {
			if (arguments[0]) {
				dynCalendar_mouseX = arguments[0].pageX;
				dynCalendar_mouseY = arguments[0].pageY;
			} else {
				dynCalendar_mouseX = event.clientX + document.body.scrollLeft;
				dynCalendar_mouseY = event.clientY + document.body.scrollTop;
				arguments[0] = null;
			}
	
			dynCalendar_oldOnmousemove();
		//}
	}

/**
* Callbacks for document.onclick
*/
	dynCalendar_oldOnclick = document.onclick ? document.onclick : new Function;

	document.onclick = function ()
	{
		// expect modern browser
		//if (is_ie5up || is_nav6up || is_gecko) {
			if(!dynCalendar_mouseoverStatus){
				for(i=0; i<dynCalendar_layers.length; ++i){
					dynCalendar_layers[i]._hideLayer();
				}
			}
	
			dynCalendar_oldOnclick(arguments[0] ? arguments[0] : null);
		//}
	}