/*
 * DatePicker
 * @author Rick Hopkins
 * @modified by Micah Nolte and Martin Vašina
 * @version 0.3.2
 * @classDescription A date picker object. Created with the help of MooTools v1.11
 * MIT-style License.

-- start it up by doing this in your domready:

$$('input.DatePicker').each( function(el){
	new DatePicker(el);
});

 */

var DatePicker = new Class({

    /* set and create the date picker text box */
    initialize: function(dp) {

        // Options defaults
        this.dayChars = 1; // number of characters in day names abbreviation
        this.dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
        this.daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        this.format = 'dd.mm.yyyy';
        this.monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
        this.startDay = 1; // 1 = week starts on Monday, 7 = week starts on Sunday
        this.yearOrder = 'asc';
        this.yearRange = 10;
        this.yearStart = (new Date().getFullYear());


		// Finds the entered date, or uses the current date		
        if (dp.value != '') {
        	valueArray = dp.value.split(".");
            dp.then  = new Date();
            dp.then.setYear(valueArray[2]);
            dp.then.setMonth((valueArray[1] -1  ));
            dp.then.setDate(valueArray[0]);
            dp.today = new Date();
        } else {
            dp.then = dp.today = new Date();
        }
		// Set beginning time and today, remember the original
        dp.oldYear = dp.year = dp.then.getFullYear();
        dp.oldMonth = dp.month = dp.then.getMonth();
        dp.oldDay = dp.then.getDate();
        dp.nowYear = dp.today.getFullYear();
        dp.nowMonth = dp.today.getMonth();
        dp.nowDay = dp.today.getDate();

		// Pull the rest of the options from the alt attr
        if (dp.alt) {
            options = Json.evaluate(dp.alt);
        } else {
            options = [];
        }
        dp.options = {
            monthNames: (options.monthNames && options.monthNames.length == 12 ? options.monthNames : this.monthNames) || this.monthNames,
            daysInMonth: (options.daysInMonth && options.daysInMonth.length == 12 ? options.daysInMonth : this.daysInMonth) || this.daysInMonth,
            dayNames: (options.dayNames && options.dayNames.length == 7 ? options.dayNames : this.dayNames) || this.dayNames,
            startDay : options.startDay || this.startDay,
            dayChars : options.dayChars || this.dayChars,
            format: options.format || this.format,
            yearStart: options.yearStart || this.yearStart,
            yearRange: options.yearRange || this.yearRange,
            yearOrder: options.yearOrder || this.yearOrder
        };
        dp.setProperties({'id':dp.getProperty('name'), 'readonly':true});
        dp.container = false;
        dp.calendar = false;
        dp.interval = null;
        dp.active = false;
        dp.onclick = dp.onfocus = this.create.pass(dp, this);
    },

    /* create the calendar */
    create: function(dp) {
        if (dp.calendar) return false;

		// Hide select boxes while calendar is up
        if (window.ie6) {
            $$('select').addClass('dp_hide');
        }

        /* create the outer container */
        dp.container = new Element('div', {'class':'dp_container'}).injectBefore(dp);

        /* create timers */
        dp.container.onmouseover = dp.onmouseover = function() {
            $clear(dp.interval);
        };
        dp.container.onmouseout = dp.onmouseout = function() {
            dp.interval = setInterval(function() {
                if (!dp.active) this.remove(dp);
            }.bind(this), 500);
        }.bind(this);

        /* create the calendar */
        dp.calendar = new Element('div', {'class':'dp_cal'}).injectInside(dp.container);

        /* create the date object */
        var date = new Date();

        /* create the date object */
        if (dp.month && dp.year) {
            date.setFullYear(dp.year, dp.month, 1);
        } else {
            dp.month = date.getMonth();
            dp.year = date.getFullYear();
            date.setDate(1);
        }
        dp.year % 4 == 0 ? dp.options.daysInMonth[1] = 29 : dp.options.daysInMonth[1] = 28;

        /* set the day to first of the month */
        var firstDay = (1 - (7 + date.getDay() - dp.options.startDay) % 7);


        /* create the month select box */
        monthSel = new Element('select', {'id':dp.id + '_monthSelect'});
        for (var m = 0; m < dp.options.monthNames.length; m++) {
            monthSel.options[m] = new Option(dp.options.monthNames[m], m);
            if (dp.month == m) monthSel.options[m].selected = true;
        }

        /* create the year select box */
        yearSel = new Element('select', {'id':dp.id + '_yearSelect'});
        i = 0;
        dp.options.yearStart ? dp.options.yearStart : dp.options.yearStart = date.getFullYear();
        if (dp.options.yearOrder == 'desc') {
            for (var y = dp.options.yearStart; y > (dp.options.yearStart - dp.options.yearRange - 1); y--) {
                yearSel.options[i] = new Option(y, y);
                if (dp.year == y) yearSel.options[i].selected = true;
                i++;
            }
        } else {
            for (var y = dp.options.yearStart; y < (dp.options.yearStart + dp.options.yearRange + 1); y++) {
                yearSel.options[i] = new Option(y, y);
                if (dp.year == y) yearSel.options[i].selected = true;
                i++;
            }
        }
        /* start creating calendar */
        calTable = new Element('table');
        calTableThead = new Element('thead');
        calSelRow = new Element('tr');
        calSelCell = new Element('th', {'colspan':'7'});
        monthSel.injectInside(calSelCell);
        yearSel.injectInside(calSelCell);
        calSelCell.injectInside(calSelRow);
        calSelRow.injectInside(calTableThead);
        calTableTbody = new Element('tbody');

        /* create day names */
        calDayNameRow = new Element('tr');
        for (var i = 0; i < dp.options.dayNames.length; i++) {
            calDayNameCell = new Element('th');

            //calDayNameCell.appendText(dp.options.dayNames[(dp.options.startDay+i)%7].substr(0, dp.options.dayChars));
            calDayNameCell.innerHTML = dp.options.dayNames[(dp.options.startDay+i)%7].substr(0, dp.options.dayChars);
            calDayNameCell.injectInside(calDayNameRow);
        }
        calDayNameRow.injectInside(calTableTbody);
        /* create the day cells */
        while (firstDay <= dp.options.daysInMonth[dp.month]) {
            calDayRow = new Element('tr');
            for (i = 0; i < 7; i++) {
                if ((firstDay <= dp.options.daysInMonth[dp.month]) && (firstDay > 0)) {
                    calDayCell = new Element('td', {'class':dp.id + '_calDay', 'axis':dp.year + '|' + (parseInt(dp.month) + 1) + '|' + firstDay});
                    calDayCell.innerHTML = firstDay;
                    calDayCell.injectInside(calDayRow);
                } else {
                    calDayCell = new Element('td', {'class':'dp_empty'});
                    calDayCell.innerHTML = ' ';
                    calDayCell.injectInside(calDayRow);
                }
				// Show the previous day
                if ((firstDay == dp.oldDay) && (dp.month == dp.oldMonth ) && (dp.year == dp.oldYear)) {
                    calDayCell.addClass('dp_selected');
                }
				// Show today
                if ((firstDay == dp.nowDay) && (dp.month == dp.nowMonth ) && (dp.year == dp.nowYear)) {
                    calDayCell.addClass('dp_today');
                }
                firstDay++;
            }
            calDayRow.injectInside(calTableTbody);
        }

        /* table into the calendar div */
        calTableThead.injectInside(calTable);
        calTableTbody.injectInside(calTable);
        calTable.injectInside(dp.calendar);
        /* set the onmouseover events for all calendar days */
        $$('td.' + dp.id + '_calDay').each(function(el) {
            el.onmouseover = function() {
                el.addClass('dp_roll');
            }.bind(this);
        }.bind(this));
        /* set the onmouseout events for all calendar days */
        $$('td.' + dp.id + '_calDay').each(function(el) {
            el.onmouseout = function() {
                el.removeClass('dp_roll');
            }.bind(this);
        }.bind(this));

        /* set the onclick events for all calendar days */
        $$('td.' + dp.id + '_calDay').each(function(el) {
            el.onclick = function() {
                ds = el.axis.split('|');
                dp.value = this.formatValue(dp, ds[0], ds[1], ds[2]);
                this.remove(dp);
            }.bind(this);
        }.bind(this));
        /* set the onchange event for the month & year select boxes */
        monthSel.onfocus = function() {
            dp.active = true;
        };
        monthSel.onchange = function() {
            dp.month = monthSel.value;
            dp.year = yearSel.value;
            this.remove(dp);
            this.create(dp);
        }.bind(this);
        yearSel.onfocus = function() {
            dp.active = true;
        };
        yearSel.onchange = function() {
            dp.month = monthSel.value;
            dp.year = yearSel.value;
            this.remove(dp);
            this.create(dp);
        }.bind(this);
    },

    /* Format the returning date value according to the selected formation */
    formatValue: function(dp, year, month, day) {
        /* setup the date string variable */
        var dateStr = '';

        /* check the length of day */
        if (day < 10) day = '0' + day;
        if (month < 10) month = '0' + month;

        /* check the format & replace parts // thanks O'Rey */
        dateStr = dp.options.format.replace(/dd/i, day).replace(/mm/i, month).replace(/yyyy/i, year);
        dp.month = dp.oldMonth = '' + (month - 1) + '';
        dp.year = dp.oldYear = year;
        dp.oldDay = day;

        /* return the date string value */
        return dateStr;
    },

    /* Remove the calendar from the page */
    remove: function(dp) {
        $clear(dp.interval);
        dp.active = false;
        if (window.opera) dp.container.empty();
        else if (dp.container) dp.container.destroy();
        dp.calendar = false;
        dp.container = false;
        $$('select.dp_hide').removeClass('dp_hide');
    }
});