/**
 * jCalendar 0.5
 *
 * Some code based on jQuery Date Picker (http://kelvinluck.com/assets/jquery/datePicker/)
 *
 * Copyright (c) 2007 Theodore Serbinski (http://tedserbinski.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */
jQuery.jcalendar = function() {
    var months = ['Styczeń', 'Luty', 'Marzec', 'Kwiecień', 'Maj', 'Czerwiec', 'Lipiec', 'Sierpień', 'Wrzesień', 'Październik', 'Listopad', 'Grudzień'];
    var days = ['Nie', 'Pon', 'Wt', 'Śr', 'Czw', 'Pt', 'Sob'];
    var navLinks = {p:'Poprzedni', n:'Następny', t:'Dzisiaj'};
    var _firstDayOfWeek;
    var _firstDate;
    var _lastDate;
    var _selectedDate;

    var _drawCalendar = function(dateIn, a, day, month, year) {
      var today = new Date();
      var d;

        if (dateIn == undefined) {
            // start from this month.
            d = new Date(today.getFullYear(), today.getMonth(), 1);
            year.val(today.getFullYear());
            month.val(today.getMonth()+1);
            day.val(today.getDate());
        }
        else {
            // start from the passed in date
            d = dateIn;
          d.setDate(1);
        }

        // check that date is within allowed limits
        if ((d.getMonth() < _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear()) || d.getFullYear() < _firstDate.getFullYear()) {
            d = new Date(_firstDate.getFullYear(), _firstDate.getMonth(), 1);
        }
        else if ((d.getMonth() > _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear()) || d.getFullYear() > _lastDate.getFullYear()) {
            d = new Date(_lastDate.getFullYear(), _lastDate.getMonth(), 1);
        }

        var firstMonth = true;
        var firstDate = _firstDate.getDate();

        // create prev and next links
        if (!(d.getMonth() == _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear())) {
            // not in first display month so show a previous link
            firstMonth = false;
            var lastMonth = d.getMonth() == 0 ? new Date(d.getFullYear()-1, 11, 1) : new Date(d.getFullYear(), d.getMonth()-1, 1);
            var prevLink = jQuery('<a href="" class="link-prev">&lsaquo; '+ navLinks.p +'</a>').click(function() {
                jQuery.jcalendar.changeMonth(lastMonth, this, day, month, year);
                return false;
            });
        }

        var finalMonth = true;
        var lastDate = _lastDate.getDate();

        if (!(d.getMonth() == _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear())) {
            // in the last month - no next link
            finalMonth = false;
            var nextMonth = new Date(d.getFullYear(), d.getMonth()+1, 1);
            var nextLink = jQuery('<a href="" class="link-next">'+ navLinks.n +' &rsaquo;</a>').click(function() {
                jQuery.jcalendar.changeMonth(nextMonth, this, day, month, year);
                return false;
            });
        }

        var todayLink = jQuery('<a href="" class="link-today">'+ navLinks.t +'</a>').click(function() {
            day.val(today.getDate());
            jQuery.jcalendar.changeMonth(today, this, day, month, year);
            return false;
        });

    // update the year and month select boxes
    year.val(d.getFullYear());
    month.val(d.getMonth()+1);

        var headRow = jQuery("<tr></tr>");
        for (var i=_firstDayOfWeek; i<_firstDayOfWeek+7; i++) {
            var weekday = i%7;
            var wordday = days[weekday];
            headRow.append('<th scope="col" abbr="'+ wordday +'" title="'+ wordday +'" class="'+ (weekday == 0 || weekday == 6 ? 'weekend' : 'weekday') +'">'+ wordday +'</th>');
        }
        headRow = jQuery("<thead></thead>").append(headRow);

        var tBody = jQuery("<tbody></tbody>");
        var lastDay = (new Date(d.getFullYear(), d.getMonth()+1, 0)).getDate();
        var curDay = _firstDayOfWeek - d.getDay();
        if (curDay > 0) curDay -= 7;

        var todayDate = today.getDate();
        var thisMonth = d.getMonth() == today.getMonth() && d.getFullYear() == today.getFullYear();

    // render calendar
        do {
          var thisRow = jQuery("<tr></tr>");
        for (var i=0; i<7; i++) {
            var weekday = (_firstDayOfWeek + i) % 7;
            var atts = {'class':(weekday == 0 || weekday == 6 ? 'weekend ' : 'weekday ')};

            if (curDay < 0 || curDay >= lastDay) {
                dayStr = ' ';
            }
            else if (firstMonth && curDay < firstDate-1) {
                dayStr = curDay+1;
                atts['class'] += 'inactive';
            }
            else if (finalMonth && curDay > lastDate-1) {
                dayStr = curDay+1;
                atts['class'] += 'inactive';
            }
            else {
                d.setDate(curDay+1);

                // attach a click handler to every day to select it if clicked
                // we use the rel attribute to keep track of the day that is being clicked
                dayStr = jQuery('<a href="" rel="'+ d +'">'+ (curDay+1) +'</a>').click(function(e) {
            if (_selectedDate) {
               _selectedDate.removeClass('selected');
            }
                _selectedDate = jQuery(this);
                _selectedDate.addClass('selected');
            day.val(new Date(_selectedDate.attr('rel')).getDate());
                    return false;
                });

                // highlight the current selected day
                if (day.val() == d.getDate()) {
                  _selectedDate = dayStr;
                  _selectedDate.addClass('selected');
                }
            }

            if (thisMonth && curDay+1 == todayDate) {
                atts['class'] += 'today';
            }
            thisRow.append(jQuery("<td></td>").attr(atts).append(dayStr));
            curDay++;
      }

            tBody.append(thisRow);
        } while (curDay < lastDay);

        jQuery('div.jcalendar').html('<table cellspacing="1"></table><div class="jcalendar-links"></div>');
        jQuery('div.jcalendar table').append(headRow, tBody);
        jQuery('div.jcalendar > div.jcalendar-links').append(prevLink, todayLink, nextLink);
    };

    return {
        show: function(a, day, month, year) {
            _firstDate = a._startDate;
            _lastDate = a._endDate;
            _firstDayOfWeek = a._firstDayOfWeek;

            // pass in the selected form date if one was set
            var selected;
            if (year.val() > 0 && month.val() > 0 && day.val() > 0) {
              selected = new Date(year.val(), month.val()-1, day.val());
            }
            else {
              selected = null;
            }
            _drawCalendar(selected, a, day, month, year);
        },
        changeMonth: function(d, e, day, month, year) {
            _drawCalendar(d, e, day, month, year);
        },
        /**
        * Function: setLanguageStrings
        *
        * Allows you to localise the calendar by passing in relevant text for the english strings in the plugin.
        *
        * Arguments:
        * days      -   Array, e.g. ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
        * months    -   Array, e.g. ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
        * navLinks  -   Object, e.g. {p:'Prev', n:'Next', c:'Close', b:'Choose date'}
        **/
        setLanguageStrings: function(aDays, aMonths, aNavLinks) {
            days = aDays;
            months = aMonths;
            navLinks = aNavLinks;
        },
        /**
        * Function: setDateWindow
        *
        * Used internally to set the start and end dates for a given date select
        *
        * Arguments:
        * i         -   The id of the INPUT element this date window is for
        * w         -   The date window - an object containing startDate and endDate properties
        *               e.g. {startDate:'24-11-1981', endDate:'25-12-2012}
        **/
        setDateWindow: function(i, w, year) {
            if (w == undefined) w = {};
            if (w.startDate == undefined) {
                // set the minimum browseable date equal to January of the min year in the select box
                // don't get the first option because that is an empty year

                // note we can't do this: year.find('option:eq(1)').val()
                // it doesn't work in 1.0 since find() is destructive
                // so we copy the object to a new var
                i._startDate = new Date($(year).find('option:eq(1)').val(), 0, 1);
            }
            else {
            dateParts = w.startDate.split('-');
            i._startDate = new Date(dateParts[2], Number(dateParts[1])-1, Number(dateParts[0]));
            }
            if (w.endDate == undefined) {
              // set the maximum browseable date equal to December of the max year in the select box

              // note we can't do this: year.find('option:last').val()
                // it doesn't work in 1.0 since find() is destructive
                // so we copy the object to a new var
                i._endDate = new Date($(year).find('option:last').val(), 11, 1);
            }
            else {
            dateParts = w.endDate.split('-');
            i._endDate = new Date(dateParts[2], Number(dateParts[1])-1, Number(dateParts[0]));
            }
            i._firstDayOfWeek = w.firstDayOfWeek == undefined ? 0 : w.firstDayOfWeek;
        }
    };
}();

jQuery.fn.jcalendar = function(a) {
    this.each(function() {
    var day = $(this).find('select.jcalendar-select-day');
    var month = $(this).find('select.jcalendar-select-month');
    var year = $(this).find('select.jcalendar-select-year');
    $('div.jcalendar-selects').after('<div class="jcalendar"></div>');
        jQuery.jcalendar.setDateWindow(this, a, year);
        jQuery.jcalendar.show(this, day, month, year);

        day.change(function() {
          // only if a valid day is selected
          if (this.value > 0) {
            d = new Date(year.val(), month.val()-1, this.value);
        jQuery.jcalendar.changeMonth(d, a, day, month, year);
      }
        });

        month.change(function() {
          // only if a valid month is selected
          if (this.value > 0) {
            d = new Date(year.val(), this.value-1, 1);
        jQuery.jcalendar.changeMonth(d, a, day, month, year);
      }
        });

        year.change(function() {
          // only if a valid year is selected
          if (this.value > 0) {
          d = new Date(this.value, month.val()-1, 1);
          jQuery.jcalendar.changeMonth(d, a, day, month, year);
        }
        });

    });
    return this;
};