/**********************************************************************
*          Calendar JavaScript [DOM] v3.01 by Michael Loesler          *
************************************************************************
* Copyright (C) 2005-07 by Michael Loesler, http//derletztekick.com    *
*                                                                      *
*                                                                      *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or    *
* (at your option) any later version.                                  *
*                                                                      *
* This program is distributed in the hope that it will be useful,      *
* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
* GNU General Public License for more details.                         *
*                                                                      *
* You should have received a copy of the GNU General Public License    *
* along with this program; if not, see <http://www.gnu.org/licenses/>  *
* or write to the                                                      *
* Free Software Foundation, Inc.,                                      *
* 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.            *
*                                                                      *
 **********************************************************************/

function EventCaledar() {
	this.now = new Date();
	this.dayname = ["Mo","Di","Mi","Do","Fr","Sa","So"];
	this.monthname = ["Januar","Februar","Maerz","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember"];
	this.dayspermonth = [31,28,31,30,31,30,31,31,30,31,30,31];
	this.tooltip = ["vorheriger Monat","nächster Monat"];
	this.monthCell = document.createElement("th");
	this.tableHead = null;
	this.parEl = null;
	
	// Array mit den ganzen Events
	this.arrayEvents = new Array();
	// TabellenBreite
	this.tableWidth = 200;	
	// TabellenHoehe
	this.tableHeight = 160;
	// Diverser angaben
	// Angabe, ob die Links zum wechseln der Monate angezeigt werden sollen, oder nicht
	this.stateLinksToNavigate = true;	
	// Link für die rechten navigationspfeile
	this.navigationLinkLeft = '';
	this.navigationLinkRight = '';
	// Angabe, ob Naviagtion nach außen verwendet werden soll
	this.useExternalNavigation = false;	
	// Link, der auf den Monatsnamen angewendet werden soll
	this.navigationMounth = '';		
	
	this.init = function( id ) {
		this.date = this.now.getDate();
		this.month = this.mm = this.now.getMonth();
		this.year = this.yy = this.now.getFullYear();
		this.monthCell.colSpan = 5;
		this.monthCell.appendChild(document.createTextNode( this.monthname[this.mm]+" "+this.yy ));
		this.tableHead = this.createTableHead();
		this.parEl = document.getElementById( id );
		this.show();
	}	
	
	// Diese Funktion initialisiert den Kalender nicht mit dem heutigen datum, 
	// sondern  Anhand eines Übergebene Datums
	this.initFromDate = function( id, jahr, monat ) {
		this.date = this.now.getDate();
		this.date2 = new Date(jahr,monat-1,1);
		
		this.month = this.now.getMonth();
		this.mm = this.date2.getMonth();
		this.year = this.now.getFullYear();
		this.yy = this.date2.getFullYear();
		
		
		this.monthCell.colSpan = 5;
		this.monthCell.appendChild(document.createTextNode( this.monthname[this.mm]+" "+this.yy ));
		this.tableHead = this.createTableHead();
		this.parEl = document.getElementById( id );
		this.show();
	}
	
	this.removeElements = function( Obj ) {
		for (var i=0; i<Obj.childNodes.length; i++)
			Obj.removeChild(Obj.childNodes[i]);
		return Obj;
	}
		
	this.show = function() {
		this.parEl = this.removeElements( this.parEl );
		this.monthCell.firstChild.replaceData(0, this.monthCell.firstChild.nodeValue.length, this.monthname[this.mm]+" "+this.yy);
		var table = document.createElement("table");
		
		// Title-Attribut Anhängen
		var breite = document.createAttribute("width");
		breite.nodeValue = this.tableWidth;
		table.setAttributeNode(breite);			
		var hoehe = document.createAttribute("height");
		hoehe.nodeValue = this.tableHeight;
		table.setAttributeNode(hoehe);		
		
		table.appendChild( this.createTableBody() );
		table.appendChild( this.tableHead );
		this.parEl.appendChild( table );
	}
			
	this.createTableHead = function() {
		var thead = document.createElement("thead");
		var tr = document.createElement("tr");
		var th = document.createElement("th");
		
		// ##### Links zum Navigieren zeigen??
		if (this.stateLinksToNavigate){
			// ### externe Navigation
			if ( !this.useExternalNavigation){
				th.appendChild(document.createTextNode( "\u00AB" ));
				th.Instanz = this;
				th.onclick = function() { this.Instanz.switchMonth("prev"); };
				th.title = this.tooltip[0];
				try { th.style.cursor = "pointer"; } catch(e){ th.style.cursor = "hand"; }
			}else{
				// baue nun den einzelnen Link zusammen:
				var newLink = document.createElement("a");
				newLink.innerHTML	=	"\u00AB" ;
				// Href-Attribut Anhängen
				var href = document.createAttribute("href");
				href.nodeValue = this.navigationLinkLeft
				newLink.setAttributeNode(href);
				th.appendChild(newLink);
			}
		}
		tr.appendChild( th );
		
		tr.appendChild( this.monthCell );	
		th = document.createElement("th");
		
		// ##### Links zum Navigieren zeigen??			
		if (this.stateLinksToNavigate){			
			// ### externe Navigation
			if ( !this.useExternalNavigation){			
				th.appendChild(document.createTextNode( "\u00BB" ));
				th.Instanz = this;
				th.onclick = function() { this.Instanz.switchMonth("next"); };
				th.title = this.tooltip[1];
				try { th.style.cursor = "pointer"; } catch(e){ th.style.cursor = "hand"; }
			}else{ 
				// baue nun den einzelnen Link zusammen:
				var newLink = document.createElement("a");
				newLink.innerHTML	=	"\u00BB" ;
				// Href-Attribut Anhängen
				var href = document.createAttribute("href");
				href.nodeValue = this.navigationLinkRight
				newLink.setAttributeNode(href);
				th.appendChild(newLink);			
			}
		}
		tr.appendChild( th );
		thead.appendChild( tr );
		tr = document.createElement('tr');
		for (var i=0; i<this.dayname.length; i++)
			tr.appendChild( this.getCell("th", this.dayname[i], "weekday" ) );
		thead.appendChild( tr );
		return thead;
	}
	
	this.createTableBody = function() {
		var sevendaysaweek = 0;
		var begin = new Date(this.yy, this.mm, 1);
		var firstday = begin.getDay()-1;
		if (firstday < 0)
			firstday = 6;
		if ((this.yy%4==0) && ((this.yy%100!=0) || (this.yy%400==0)))
			this.dayspermonth[1] = 29;
		
		var tbody = document.createElement("tbody");
		var tr = document.createElement('tr');
		
		for (var i=0; i<firstday; i++, sevendaysaweek++)
			tr.appendChild( this.getCell( "td", " ", null ) );

		for (var i=1; i<=this.dayspermonth[this.mm]; i++, sevendaysaweek++){
			if (this.dayname.length == sevendaysaweek){
				tbody.appendChild( tr );
				tr = document.createElement('tr');
				sevendaysaweek = 0;
			}
			
			if (this.checkDateForEvent(i,this.mm+1 , this.yy))	{
				// baue nun den einzelnen Link zusammen:
				var newLink = document.createElement("a");
				newLink.innerHTML	=	i;
				// Href-Attribut Anhängen
				var href = document.createAttribute("href");
				href.nodeValue = this.getLinkHref(i,this.mm+1, this.yy);
				newLink.setAttributeNode(href);
				// Title-Attribut Anhängen
				var title = document.createAttribute("title");
				title.nodeValue = this.getLinkTitle(i,this.mm+1, this.yy);
				newLink.setAttributeNode(title);
				
				td = this.getCell( "td", '', "event" );
				td.appendChild(newLink);
				tr.appendChild(td);	
				}
			// heute und Wochenende
			else if (i==this.date && this.mm==this.month && this.yy==this.year && (sevendaysaweek == 5 || sevendaysaweek == 6))
				tr.appendChild( this.getCell( "td", i, "today weekend" ) );
			// heute ??
			else if (i==this.date && this.mm==this.month && this.yy==this.year)
				tr.appendChild( this.getCell( "td", i, "today" ) );
			// Wochenende ??
			else if (sevendaysaweek == 5 || sevendaysaweek == 6)
				tr.appendChild( this.getCell( "td", i, "weekend" ) );
			// normaler Tag
			else
				tr.appendChild( this.getCell( "td", i, null ) );
		}

		for (var i=sevendaysaweek; i<this.dayname.length; i++)
			tr.appendChild( this.getCell( "td", " ", null  ) );

		tbody.appendChild( tr );
		return tbody;
		
	}
	
	this.getCell = function(tag, str, cssClass) {
		var El = document.createElement( tag );
		El.appendChild(document.createTextNode( str ));
		if (cssClass != null)
			El.className = cssClass;
		return El;
	}			

	this.switchMonth = function( s ){
		switch (s) {
			case "prev": 
				this.yy = (this.mm == 0)?this.yy-1:this.yy;
				this.mm = (this.mm == 0)?11:this.mm-1;
			break;
			case "next":
				this.yy = (this.mm == 11)?this.yy+1:this.yy;
				this.mm = (this.mm == 11)?0:this.mm+1;
			break;
		}
		this.show();
	}
	
	// Diese Funtion Prüft, ob unter das Aktuelle Datum ein
	// event Fällt
	this.checkDateForEvent = function(tag, monat , jahr){
		if (tag <10 ) 	tag = '0' + tag;
		if (monat <10 ) monat = '0' + monat;		
		datum = tag +"." + monat + "." + jahr;
		if (this.arrayEvents[datum] ) return true;
		else return false;
	}		
	
	// Diese Liefrt den Titel für den Link abhängig vom datum
	this.getLinkTitle = function(tag, monat, jahr){
		if (tag <10 ) 	tag = '0' + tag;
		if (monat <10 ) monat = '0' + monat;		
		datum = tag +"." + monat + "." + jahr;
		if (this.arrayEvents[datum] ) return this.arrayEvents[datum]["titel"];
		else return '';
	}	
	// Diese Liefrt den Titel für den Link abhängig vom datum
	this.getLinkHref = function(tag, monat, jahr){
		if (tag <10 ) 	tag = '0' + tag;
		if (monat <10 ) monat = '0' + monat;
		datum = tag +"." + monat + "." + jahr;
		if (this.arrayEvents[datum] ) return this.arrayEvents[datum]["link"];
		else return '';
	}	
	
	// Diese Funktion setzt einen Event!
	this.setEvent = function(datum, titel, link ){
		this.arrayEvents[datum] = new Array();
		this.arrayEvents[datum]["titel"] = titel;
		this.arrayEvents[datum]["link"] = link;
	}	
	// Diese Funktion setzt die TAbellenBreite
	this.setTableWidth = function(tableWidth ){
		this.tableWidth = tableWidth;
	}
}