//###############
//# FORMS
//###############

var field_count = 0;
var field_name = new Array();
var field_desc = new Array();
var field_datatype = new Array();
var field_required = new Array();

function validateform(form) {
	for (f=0; f<form.elements.length; f++) {
		if (form.elements[f].name) {
			for (q=0; q<field_name.length; q++) {
				if (field_name[q] == form.elements[f].name) {
					if (field_required[q] == "1" && !form.elements[f].value) {
						frm_fld = form.elements[f];
						err_msg = "Please complete " + field_desc[q] + ".";
						break;
					} else if (field_datatype[q] == "date" && form.elements[f].value && !isdate(form.elements[f].value)) {
						frm_fld = form.elements[f];
						err_msg = "Please enter a valid date for " + field_desc[q] + ".";
						break;
					} else if (field_datatype[q] == "time" && form.elements[f].value) {
						form.elements[f].value = form.elements[f].value.replace(" pm","")
						form.elements[f].value = form.elements[f].value.replace(" am","")
						if (!istime(form.elements[f].value + " " + form.elements[f + 1].value)) {
							frm_fld = form.elements[f];
							err_msg = "Please enter a valid time for " + field_desc[q] + ".";
							break;
						} else {
							form.elements[f].value = form.elements[f].value + " " + form.elements[f + 1].value;
						}
					} else if (field_datatype[q] == "fraction" && form.elements[f].value) {
						if (!isnumeric(decimal(form.elements[f].value))) {
							frm_fld = form.elements[f];
							err_msg = "Please enter a valid fraction for " + field_desc[q] + ".";
							break;
						} else {
							form.elements[f].value = decimal(form.elements[f].value);
						}
					}
				}
			}
		}
	}
}

//###############
//# STRINGS
//###############

function isnumeric(n) {
	var validchars = "0123456789.";
	var isnumber = true;
	for (i=0;i < n.length && isnumber == true;i++) { 
		if (validchars.indexOf(n.charAt(i)) == -1) {
			isnumber = false;
		}
	}
	return isnumber;
}

function fraction(decimal) {
	var maxdenominator = 32;
	var approx = 0;
	var error = 0;
	var best = 0;
	var besterror = 0;
	for (i=1; i <= maxdenominator; i++) {
		approx = Math.round(decimal/(1/i));
		error = (decimal - (approx/i))
		if (i==1) {
			best = i;
			besterror = error;
		}
		if (Math.abs(error) < Math.abs(besterror)) {
			best = i;
			besterror = error;
		}
	}
	return(Math.round(decimal/(1/best)) + "/" + best);
}

function decimal(fraction) {
	var fractionarray = fraction.split("/");
	var numerator = 1;
	var denominator = 1;
	var number = 0;
	var decimal = fraction;
	if (fractionarray.length == 2) {
		var numeratorarray = fractionarray[0].split(" ");
		if (numeratorarray.length == 2) {
			number = numeratorarray[0];
		}
		numerator = numeratorarray[numeratorarray.length-1];
		denominator = fractionarray[1];
		if (isnumeric(number) && isnumeric(numerator) && isnumeric(denominator)) {
			decimal = parseInt(number) + parseFloat(numerator/denominator);
		}
	}
	return(decimal);
}

//###############
//# DATES
//###############

var monthname = new Array(11);

monthname[0] ="January";
monthname[1] ="February";
monthname[2] ="March";
monthname[3] ="April";
monthname[4] ="May";
monthname[5] ="June";
monthname[6] ="July";
monthname[7] ="August";
monthname[8] ="September";
monthname[9] ="October";
monthname[10] ="November";
monthname[11] ="December";

var monthabbr = new Array(11);

monthabbr[0] = "Jan";
monthabbr[1] = "Feb";
monthabbr[2] = "Mar";
monthabbr[3] = "Apr";
monthabbr[4] = "May";
monthabbr[5] = "Jun";
monthabbr[6] = "Jul";
monthabbr[7] = "Aug";
monthabbr[8] = "Sep";
monthabbr[9] = "Oct";
monthabbr[10] = "Nov";
monthabbr[11] = "Dec";

var weekdayabbr = new Array(6);

weekdayabbr[0] = "Sun";
weekdayabbr[1] = "Mon";
weekdayabbr[2] = "Tue";
weekdayabbr[3] = "Wed";
weekdayabbr[4] = "Thu";
weekdayabbr[5] = "Fri";
weekdayabbr[6] = "Sat";

var datesuffix = new Array(31);

datesuffix[1] = "st";
datesuffix[2] = "nd";
datesuffix[3] = "rd";
datesuffix[4] = "th";
datesuffix[5] = "th";
datesuffix[6] = "th";
datesuffix[7] = "th";
datesuffix[8] = "th";
datesuffix[9] = "th";
datesuffix[10] = "th";
datesuffix[11] = "th";
datesuffix[12] = "th";
datesuffix[13] = "th";
datesuffix[14] = "th";
datesuffix[15] = "th";
datesuffix[16] = "th";
datesuffix[17] = "th";
datesuffix[18] = "th";
datesuffix[19] = "th";
datesuffix[20] = "th";
datesuffix[21] = "st";
datesuffix[22] = "nd";
datesuffix[23] = "rd";
datesuffix[24] = "th";
datesuffix[25] = "th";
datesuffix[26] = "th";
datesuffix[27] = "th";
datesuffix[28] = "th";
datesuffix[29] = "th";
datesuffix[30] = "th";
datesuffix[31] = "st";

function isdate(datevalue) {
	var datearray = datevalue.split("/");
	if(datearray.length == 3) {
		if(isnumeric(datearray[0]) && isnumeric(datearray[1]) && isnumeric(datearray[2])) {
			if(datearray[0] > 0 && datearray[0] <= 12 && datearray[1] > 0 && datearray[1] <= 31 && datearray[2] > 1900  && datearray[2] <= 2500) {
				if(datearray[1] > daysinmonth(datearray[2],datearray[0])) {
					return(false);
				} else {
					return(true);
				}
			} else {
				return(false);
			}
		} else {
			return(false);
		}
	} else {
		return(false);
	}
}

function daysinmonth(yearvalue,monthvalue) {
	if (yearvalue < 1900) {
		yearvalue = yearvalue + 1900;
	}
	var currentmonth = new Date(yearvalue, monthvalue, 1);
  var nextmonth = new Date(yearvalue, monthvalue + 1, 1);
	return(Math.ceil((nextmonth.getTime() - currentmonth.getTime() - 3600000)/86400000));
}

function withinrange(begindate,enddate,comparedate) {
	comparedate = new Date(comparedate);
	if (comparedate.getYear() < 1900) {
		begindateyear = begindate.getYear() + 1900;
		enddateyear = enddate.getYear() + 1900;
		comparedateyear = comparedate.getYear() + 1900;
	} else {
		begindateyear = begindate.getYear();
		enddateyear = enddate.getYear();
		comparedateyear = comparedate.getYear();
	}
	if (comparedateyear > enddateyear || comparedateyear == enddateyear && comparedate.getMonth() > enddate.getMonth() || comparedateyear == enddateyear && comparedate.getMonth() == enddate.getMonth() && comparedate.getDate() > enddate.getDate() || comparedateyear < begindateyear || comparedateyear == begindateyear && comparedate.getMonth() < begindate.getMonth() || comparedateyear == begindateyear && comparedate.getMonth() == begindate.getMonth() && comparedate.getDate() < begindate.getDate()) {
		return(false);
	} else {
		return(true);
	}
}

function istime(timestr) {
	var validtime = true;
	var timepat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
	var matcharray = timestr.match(timepat);
	if (matcharray == null) {
		validtime = false;
	}
	if (validtime) {
		hour = matcharray[1];
		minute = matcharray[2];
		second = matcharray[4];
		ampm = matcharray[6];
		if (second == "") {
			second = null;
		}
		if (ampm == "") {
			ampm = null
		}
		if (parseInt(hour) <= 0 || parseInt(hour) > 12) {
			validtime = false;
		}
		if (parseInt(hour) < 12 && ampm == null) {
			validtime = false;
		}
		if (parseInt(minute) < 0 || parseInt(minute) > 59) {
			validtime = false;
		}
		if (parseInt(second) != null && (parseInt(second) < 0 || parseInt(second) > 59)) {
			validtime = false;
		}
	}
	return(validtime);
}