//	written	by Gökhan Çevik
//	Takvim hakkında gelen fonksiyonlar...
//

var dtCh = ".";
var minYear = 1900;
var maxYear = 2100;

function DaysArray(n) {
    var daysArr = new Array();
    for (var i = 1; i <= n; i++) {
        daysArr[i] = 31;
        if (i == 4 || i == 6 || i == 9 || i == 11) { daysArr[i] = 30; }
        if (i == 2) { daysArr[i] = 29; }
    }
    return daysArr;
}

function isInteger(s) {
    var i;
    for (i = 0; i < s.length; i++) {
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag) {
    var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary(year) {
    // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ((!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28);
}

function isDate(dtStr) {
    var daysInMonth = DaysArray(12)
    var pos1 = dtStr.indexOf(dtCh)
    var pos2 = dtStr.indexOf(dtCh, pos1 + 1)
    var strDay = dtStr.substring(0, pos1)
    var strMonth = dtStr.substring(pos1 + 1, pos2)
    var strYear = dtStr.substring(pos2 + 1)
    strYr = strYear
    if (strDay.charAt(0) == "0" && strDay.length > 1) strDay = strDay.substring(1)
    if (strMonth.charAt(0) == "0" && strMonth.length > 1) strMonth = strMonth.substring(1)
    for (var i = 1; i <= 3; i++) {
        if (strYr.charAt(0) == "0" && strYr.length > 1) strYr = strYr.substring(1)
    }
    month = parseInt(strMonth)
    day = parseInt(strDay)
    year = parseInt(strYr)
    if (dtStr != "") {
        if (pos1 == -1 || pos2 == -1) {
            alert(strTRH_GECERSIZTARIH)
            return false

        }
        if (strMonth.length < 1 || month < 1 || month > 12) {
            alert(strTRH_GECERSIZAY)
            return false

        }
        if (strDay.length < 1 || day < 1 || day > 31 || (month == 2 && day > daysInFebruary(year)) || day > daysInMonth[month]) {
            alert(strTRH_GECERSIZGUN)
            return false
        }
        if (strYear.length != 4 || year == 0 || year < minYear || year > maxYear) {
            alert(strTRH_TARIHARALIGI + minYear + " / " + maxYear)
            return false
        }
        if (dtStr.indexOf(dtCh, pos2 + 1) != -1 || isInteger(stripCharsInBag(dtStr, dtCh)) == false) {
            alert(strTRH_GECERSIZTARIH)
            return false
        }
    }
    return true
}

function compareTwoDate(starih1, starih2) {
    var difference = 0;
    tarih1 = new Date(starih1.substring(6, 10), starih1.substring(3, 5), starih1.substring(0, 2))
    tarih2 = new Date(starih2.substring(6, 10), starih2.substring(3, 5), starih2.substring(0, 2))
    difference = tarih2 - tarih1;
    if (parseInt(difference) < 0) {
        alert(strTRH_TARIHKARSILASTIR);

        return false;
    }
    return true;
}

strIleriGeri = 'ileri';
function dateDayValidation(starih, strField, strIleriGeri) {
    // Parse the string in DD/MM/YYYY format          
    var dt1 = new Date(starih.substring(6, 10), starih.substring(3, 5) - 1, starih.substring(0, 2))
    var today = new Date()
    var dt2 = new Date(today.getYear(), today.getMonth(), today.getDate())

    if (strIleriGeri == 'ileri') {
        if (dt1 > dt2) {
            alert(strField + strTRH_ILERIGUNKONTROL);
            return false;
        }
    }
    else {
        if (dt1 < dt2) {
            alert(strField + strTRH_GERIGUNKONTROL);
            return false;
        }
    }
    return true;
}

//Tarih Fonksiyonları
function dateValidation(starih1, starih2) {
    var blnDate = true;
    if (starih1 != "") {
        blnDate = isDate(starih1);

    }
    if (blnDate) {
        if (starih2 != "") {
            blnDate = isDate(starih2);
        }
    }

    if (blnDate) {
        if (starih2 != "")
            return compareTwoDate(starih1, starih2);
    }
    return blnDate;
}