/* external_date_functions.js
*
* Purpose: Sample external date functions for JavaScript calendar
* Author: Richard Pike)
* Website: http://calendar.pikesys.com
*
* my_date returns an alternate date string corresponding to the given Gregorian date 
* my_holiday returns an appropriate holiday text string for the given Gregorian date
* my_alt_holiday returns an appropriate alternate holiday string for the given Gregorian date
*
*/

function makeArray() {
    this[0] = makeArray.arguments.length;
    for (i = 0; i < makeArray.arguments.length; i = i + 1)
        this[i+1] = makeArray.arguments[i];
}

var altMonthNames = new makeArray("Red", "Yellow", "Blue","Green","Purple","Orange","Cyan","Magenta","Goldenrod","Brown","Black","White");
var altMonths = new Array;

// altMonths constructor
function altMonth(startdate, monthnumber) {
    this.startdate = startdate;
    this.month = monthnumber;
}

function DefineAltMonth(startdate, monthnumber) {
    altMonths[altMonths.length] = new altMonth(startdate, monthnumber);
}

// these could be defined in external JavaScript such as altdates.js (the last altMonth defined will not show because endate is unknown!)
DefineAltMonth(20040404, 1);
DefineAltMonth(20040505, 2);
DefineAltMonth(20040606, 3);
DefineAltMonth(20040707, 4);
DefineAltMonth(20040808, 5);
DefineAltMonth(20040909, 6);
DefineAltMonth(20041010, 7);
DefineAltMonth(20041111, 8);
DefineAltMonth(20041212, 9);
DefineAltMonth(20050113, 10);
DefineAltMonth(20050214, 11);
DefineAltMonth(20050315, 12);
DefineAltMonth(20050416, 1);

function my_date(day, month, year, style) {
    if (!style) style = 0;
    var mo = 0;
    var dy, yr;
    var dateString = "";

    ymd = day + month*100 + year*10000;
    for (i=1; i<altMonths.length-1; i++) {
        if (ymd >= altMonths[i-1].startdate && ymd < altMonths[i].startdate) {
            mo = altMonths[i-1].month;
            startDay = altMonths[i-1].startdate%100;
            startMonth = ((altMonths[i-1].startdate-startDay)/100)%100;
            if (month == startMonth) {
                dy = day - startDay +1;
            } else {
                ym = month + year*100;
                prevYM = PrevYearMonth(ym);
                prevM = prevYM%100;
                prevY = (prevYM - prevM)/100;
                eom = NumDaysIn(prevM, prevY);
                dy = day + (eom - startDay +1);
            }
            yr = year - 1970;
            break;
        }
    }
    if (mo > 0) {
        if (style == 0) {       // day monthnum year
            dateString = dy + ' ' + mo + ' ' + yr;
        } else if (style == 1) {    // monthname year
            dateString = altMonthNames[mo] + ' ' + yr;
        } else if (style == 2) {    // day monthname
            dateString = dy + ' ' + altMonthNames[mo];
        } else if (style == 3) {    // monthname day
            dateString = altMonthNames[mo] + ' ' + dy;
        } else if (style == 4) {    // day monthname year
            dateString = dy + ' ' + altMonthNames[mo] + ' ' + yr;
        }
    }
    return dateString;
}

function my_holiday(day, month, year) {
//alert("my_holiday("+day+","+month+","+year+")");
    var holString = "";
    // some American civil holidays
    if (month == 1 && day == 1) {
        holString = "New Year's Day";
    } else if (month == 6 && day == 14) {
        holString = "Flag Day";
    } else if (month == 2 && day == 14) {
        holString = "Valentines Day";
    } else if (month == 3 && day == 13) {
        holString = "DST Begins";
    } else if (month == 3 && day == 17) {
        holString = "St. Patricks Day";
    } else if (month == 4 && day == 3) {
        holString = "Easter";
    } else if (month == 5 && day == 8) {
        holString = "Mothers Day";
    } else if (month == 5 && day == 31) {
        holString = "Memorial Day";
    } else if (month == 6 && day == 19) {
        holString = "Fathers Day";
/*        
    } else if (month == 6 && day == 24) {
        holString = "Texas State Championship";
    } else if (month == 6 && day == 25) {
        holString = "Texas State Championship";
    } else if (month == 6 && day == 26) {
        holString = "Texas State Championship";
    } else if (month == 6 && day == 27) {
        holString = "Texas State Championship";
*/        
    } else if (month == 7 && day == 4) {
        holString = "Independence Day";
    } else if (month == 9 && day == 5) {
        holString = "Labor Day";
/*        
    } else if (month == 9 && day == 16) {
        holString = "Texas State FITASC";
    } else if (month == 9 && day == 17) {
        holString = "Texas State FITASC";
    } else if (month == 9 && day == 18) {
        holString = "Texas State FITASC";
    } else if (month == 9 && day == 19) {
        holString = "Texas State FITASC";
    } else if (month == 10 && day == 26) {
        holString = "National Sporting Clays Championship";
    } else if (month == 10 && day == 27) {
        holString = "National Sporting Clays Championship";
    } else if (month == 10 && day == 28) {
        holString = "National Sporting Clays Championship";
    } else if (month == 10 && day == 29) {
        holString = "National Sporting Clays Championship";
    } else if (month == 10 && day == 30) {
        holString = "National Sporting Clays Championship";
    } else if (month == 10 && day == 31) {
        holString = "National Sporting Clays Championship";
*/        
    } else if (month == 10 && day == 31) {
        holString = "Halloween";
    } else if (month == 11 && day == 6) {
        holString = "DST Ends";
    } else if (month == 11 && day == 11) {
        holString = "Veterans Day";
    } else if (month == 11 && day == 24) {
        holString = "Thanksgiving Day";
    } else if (month == 12 && day == 25) {
        holString = "Christmas Day";
    }
    return holString;
}

function my_alt_holiday(day, month, year) {
    var aday, amonth;
    var holString = "";
    
    // calculate alternate date from given Gregorian date
    var altDate = my_date(day, month, year);
    var altMonthYear = altDate.substring(altDate.indexOf(' ')+1, altDate.length);
    aday = eval(altDate.substring(0, altDate.indexOf(' ')));
    amonth = eval(altMonthYear.substring(0, altMonthYear.indexOf(' ')));
    
    if (aday == 1 ) {
        holString = "Happy " + altMonthNames[amonth];
    }
    return holString;
}