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/**
 * Datetimecombo.js
 * This is a javascript object that handles rendering the non-date portions
 * of a datetime field.  There are some assumptions that are made so this
 * class serves more as a utility rather than a building block.  It is used
 * primarily to handle the datetime field shown for Call, Meetings and Tasks
 * edit views.
 */
 
/*
 * Datetimecombo constructor
 * @param datetime 
 * @param fieldname
 * @param timeformat
 * @param tabindex
 * @allowEmptyHM - if this param was set true , the hour and minute select field will has an empty option.
 */
function Datetimecombo (datetime, field, timeformat, tabindex, showCheckbox, checked, allowEmptyHM) {
    this.datetime = datetime;
    this.allowEmptyHM = allowEmptyHM;
    if(typeof this.datetime == "undefined" || datetime == '' || trim(datetime).length < 10) {
       this.datetime = "";
       var d = new Date();
       var month = d.getMonth();
       var date = d.getDate();
       var year = d.getYear();
       var hours = d.getHours();
       var minutes = d.getMinutes(); 
    }

    this.fieldname = field;
    //Get hours and minutes and adjust as necessary
    this.hrs = parseInt(datetime.substring(11,13), 10);
    this.mins = parseInt(datetime.substring(14,16), 10);

    //A safety scan to make sure hrs and minutes are formatted correctly
	if (this.mins > 0 && this.mins < 15) {
		this.mins = 15;
	} else if (this.mins > 15 && this.mins < 30) {
		this.mins = 30;
	} else if (this.mins > 30 && this.mins < 45) {
		this.mins = 45;
	} else if (this.mins > 45) {
		this.hrs += 1;
		this.mins = 0;
	} //if-else


    this.timeformat = timeformat;  //23:00 || 11:00
    this.tabindex = tabindex == null || isNaN(tabindex) ? 1 : tabindex;
    
    // Calculate other derived values
    this.timeseparator = this.timeformat.substring(2,3);
    this.has12Hours = /^11/.test(this.timeformat);
    this.hasMeridiem = /am|pm/i.test(this.timeformat);
	if(this.hasMeridiem) {
	   this.pm = /pm/.test(this.timeformat);
    }
    this.meridiem = this.hasMeridiem ? trim(this.datetime.substring(16)) : '';
    this.datetime = this.datetime.substr(0,10);
    this.showCheckbox = showCheckbox;
    this.checked = parseInt(checked);
    document.getElementById(this.fieldname + '_date').value = this.datetime;

}

/**
 * jsscript
 * This function renders the javascript portion to handle updates
 * on the calendar widget.  We have to do this because browsers like Mozilla
 * have errors when attempting to handle events inside a class function.
 * This is the reason why this code that is generated is not placed within
 * the update function of the Datetimecombo class.  Instead, it is run
 * using the eval() method when the widget is loaded.
 */
Datetimecombo.prototype.jsscript = function(callback) {
	//text = '\n<script language="javascript" type="text/html">';
	text = '\nfunction update_' + this.fieldname + '(calendar) {';
	text += '\nif(calendar != null) {';
	text += '\ncalendar.onUpdateTime();';
	text += '\ncalendar.onSetTime();';
	text += '\ncalendar.hide();';
	text += '\n}'
    text += '\nd = document.getElementById("' + this.fieldname + '_date").value;';
    text += '\nh = document.getElementById("' + this.fieldname + '_hours").value;';
    text += '\nm = document.getElementById("' + this.fieldname + '_minutes").value;';
    text += '\nnewdate = d + " " + h + "' + this.timeseparator + '" + m;';
    if(this.hasMeridiem) {
       text += '\nif(typeof document.getElementById("' + this.fieldname + '_meridiem") != "undefined") {';
       text += '\n   newdate += document.getElementById("' + this.fieldname + '_meridiem").value;';
       text += '\n}';
    }
    text += '\nif(trim(newdate) =="'+ this.timeseparator +'") newdate="";';
    text += '\ndocument.getElementById("' + this.fieldname + '").value = newdate;';
    text += '\n' + callback;
    text += '\n}';
    //text += '\n</script>';
    return text;
}

/**
 * html
 * This function renders the HTML form elements for this widget
 */
Datetimecombo.prototype.html = function(callback) {

	//Now render the items
	var text = '<select class="datetimecombo_time" size="1" id="' + this.fieldname + '_hours" tabindex="' + this.tabindex + '" onchange="combo_' + this.fieldname + '.update(); ' + callback + '">';
	var h1 = this.has12Hours ? 1 : 0;
	var h2 = this.has12Hours ? 12 : 23;
	if(this.allowEmptyHM){
		 text += '<option></option>';
	}
	for(i=h1; i <= h2; i++) {
	    val = i < 10 ? "0" + i : i;
	    text += '<option value="' + val + '" ' + (i == this.hrs ? "SELECTED" : "") +  '>' + val + '</option>';
	}
	
	text += '\n</select>&nbsp;';
	text += this.timeseparator;
	text += '\n&nbsp;<select class="datetimecombo_time" size="1" id="' + this.fieldname + '_minutes" tabindex="' + this.tabindex + '" onchange="combo_' + this.fieldname + '.update(); ' + callback + '">';
	if(this.allowEmptyHM){
		text += '\n<option></option>';
	}
	text += '\n<option value="00" ' + (this.mins == 0 ? "SELECTED" : "") + '>00</option>';
	text += '\n<option value="15" ' + (this.mins == 15 ? "SELECTED" : "") + '>15</option>';
	text += '\n<option value="30" ' + (this.mins == 30 ? "SELECTED" : "") + '>30</option>';
	text += '\n<option value="45" ' + (this.mins == 45 ? "SELECTED" : "") + '>45</option>';
	text += '\n</select>';
	
	if(this.hasMeridiem) {
		text += '\n&nbsp;';
		text += '\n<select class="datetimecombo_time" size="1" id="' + this.fieldname + '_meridiem" tabindex="' + this.tabindex + '" onchange="combo_' + this.fieldname + '.update(); ' + callback + '">';
		if(this.allowEmptyHM){
			text += '\n<option></option>';
		}
		text += '\n<option value="' + (this.pm ? "am" : "AM") + '" ' + (/am/i.test(this.meridiem) ? "SELECTED" : "") + '>' + (this.pm ? "am" : "AM") + '</option>';
		text += '\n<option value="' + (this.pm ? "pm" : "PM") + '" ' + (/pm/i.test(this.meridiem) ? "SELECTED" : "") + '>' + (this.pm ? "pm" : "PM") + '</option>';
		text += '\n</select>';
	}
	
	if(this.showCheckbox) {
	    text += '\n<input style="visibility:hidden;" type="checkbox" name="' + this.fieldname + '_flag" id="' + this.fieldname + '_flag" tabindex="' + this.tabindex + '" onchange="combo_' + this.fieldname + '.update(); ' + callback + '" ' + (this.checked ? 'CHECKED' : '') + '>';
	    //text += '&nbsp;' + SUGAR.language.get("app_strings", "LBL_LINK_NONE");	
	}

	return text;
};


/**
 * update
 * This method handles events on the hour, minute and meridiem elements for the widget
 * 
 * XXX TODO 20100317 Frank Steegmans: The code in this module is violating so many best practices
 * that it will need to get rewritten. Also note that it still stems from before the datetime unification.
 */
Datetimecombo.prototype.update = function() {
	// Bug 42025: hour/minute/second still required when start_date is non required
	//			  Fixing this by just assigning default when they aren't required
    var d = window.document.getElementById(this.fieldname + '_date');
	var h = window.document.getElementById(this.fieldname + '_hours');
	var m = window.document.getElementById(this.fieldname + '_minutes');
	var mer = document.getElementById(this.fieldname + "_meridiem");
	
	if(d.value == "") { // if date is not set wipe time settings
		h.selectedIndex = 0;
		m.selectedIndex = 0;
		if(mer) mer.selectedIndex = 0;
	} else { // if date is set and hours/minutes are not allowed empty, initialize them
		if(this.allowEmptyHM) {
			if(h.selectedIndex == 0) h.selectedIndex = 12;
			if(m.selectedIndex == 0) m.selectedIndex = 1;
			if(mer && (mer.selectedIndex == 0)) mer.selectedIndex = 1;
		}
	}
	
	var newdate = d.value + ' ' + h.value + this.timeseparator  + m.value;

	if(this.hasMeridiem) {
	   ampm = document.getElementById(this.fieldname + "_meridiem").value;
	   newdate += ampm;
	}
	if(trim(newdate) == ""+this.timeseparator+""){
		newdate = '';
	}
	document.getElementById(this.fieldname).value = newdate;

    if(this.showCheckbox) {	
         flag = this.fieldname + '_flag';
         date = this.fieldname + '_date';
         hours = this.fieldname + '_hours';
         mins = this.fieldname + '_minutes';
         
		 if(document.getElementById(flag).checked) {
			document.getElementById(flag).value=1;
			document.getElementById(this.fieldname).value = '';
			document.getElementById(date).disabled=true;
			document.getElementById(hours).disabled=true;
			document.getElementById(mins).disabled=true;
		 } else {
			document.getElementById(flag).value=0;
			document.getElementById(date).disabled=false;
			document.getElementById(hours).disabled=false;
			document.getElementById(mins).disabled=false;		 
		 } 
	}
	  
};