/** support multimonth calender **/

/**
 * Copyright (c) 2008 Kelvin Luck (http://www.kelvinluck.com/)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 **/

(function($) {

    $.fn.extend({
        datePickerMultiMonth: function(s) {
            s.numMonths = s.numMonths || 2;

            $(this).each(
				function() {

				    var dps = $.extend({}, $.fn.datePicker.defaults, s);

				    var $dpmm = $(this);
				    var pickers = [];
				    var basePicker;

				    var m;

				    if (s.inline) {

				        $dpmm.html('');

				        for (var i = 0; i < s.numMonths; i++) {
				            (function(i) {
				                var first = i == 0;
				                var last = i == s.numMonths - 1;
				                var $date = $('<div></div>')
												.datePicker(dps)
												.bind('dpMonthChanged',
													function(event, displayedMonth, displayedYear) {
													    if (first) {
													        $dpmm.trigger('dpMonthChanged', [displayedMonth, displayedYear]);
													    } else {
													        pickers[i - 1].dpSetDisplayedMonth(displayedMonth - 1, displayedYear);
													    }
													    if (!last) {
													        pickers[i + 1].dpSetDisplayedMonth(displayedMonth + 1, displayedYear);
													    }
													    return false;
													}
												)
												.bind(
													'dateSelected',
													function(event, date, $td, status) {
													    if (first) {
													        $dpmm.trigger('dateSelected', [date, $td, status]);
													    } else {
													        pickers[i - 1].dpSetSelected(date.asString(), status, false);
													    }
													    if (!last) {
													        pickers[i + 1].dpSetSelected(date.asString(), status, false);
													    }
													    return false;
													}
												);
				                $date.find('.dp-nav-prev').css('display', first ? 'block' : 'none');
				                $date.find('.dp-nav-next').css('display', last ? 'block' : 'none');
				                pickers.push($date);
				                $dpmm.append($date);
				            })(i);
				        }
				        basePicker = pickers[0];

				    } else {

				        var displayedMonth;
				        var displayedYear;
				        var selectedDate;

				        if (dps.closeOnSelect == false) throw new Error("Popup multi month date pickers must close on select");
				        if (dps.selectMultiple == true) throw new Error("Popup multi month date pickers aren't compatible with selectMultiple");

				        $dpmm.datePicker(dps).bind(
							'dateSelected',
							function(event, date, $td, status) {
							    selectedDate = date.asString();
							}
						).bind(
							'dpDisplayed',
							function(event, datePickerDiv) {
							    var $popup = $(datePickerDiv).empty().css({ width: 'auto' });

							    var d = $dpmm.dpGetSelected();
							    if (d.length) {
							        selectedDate = new Date(d[0]).asString();
							    }


							    for (var i = 0; i < s.numMonths; i++) {
							        (function(i) {

							            var s = $.extend({}, dps);
							            s.inline = true;
							            s.month = displayedMonth + i;
							            s.year = displayedYear;

							            var last = i == s.numMonths - 1;
							            var first = i == 0;

							            var $dp = $('<div></div>');
							            $popup.append($dp);


							            $dp.datePicker(s).bind(
												'dpMonthChanged',
												function(event, newMonth, newYear) {
												    if (i == 0) {
												        displayedMonth = newMonth;
												        displayedYear = newYear;
												    }
												    if (!first) {
												        pickers[i - 1].dpSetDisplayedMonth(newMonth - 1, newYear);
												    }
												    if (!last) {
												        pickers[i + 1].dpSetDisplayedMonth(newMonth + 1, newYear);
												    }
												    return false;
												}
											).bind(
												'dateSelected',
												function(event, date, $td, status) {
												    var d = date.asString();
												    if (d != selectedDate) {
												        basePicker.dpSetSelected(date.asString());
												        var defaultFromdate = (date.addDays(7)).asString();
												        /* Default return date should be defaulted to 1 week after the Departure date */
												        basePicker.dpClose();
												    }
												}
											).find('.dp-nav-next').css('display', last ? 'block' : 'none').end()
											 .find('.dp-nav-prev').css('display', first ? 'block' : 'none').end();

							            if (selectedDate) {
							                $dp.dpSetSelected(selectedDate, true, false);
							            }
							            pickers.push($dp);
							        })(i);
							    }
							}
						).bind(
							'dpMonthChanged',
							function(event, newMonth, newYear) {
							    displayedMonth = newMonth;
							    displayedYear = newYear;
							}
						).bind(
							'dpClosed',
							function(event, selected) {
							    pickers = [];
							}
						);
				        basePicker = $dpmm;
				    }

				    $dpmm.data('dpBasePicker', basePicker);

				    // dodgy hack so that I can set the month to the correct value and trigger a redraw of the other elements... 
				    basePicker.dpSetDisplayedMonth(1, 3000);
				    // set the month to the correct value so the other date pickers get set to the correct months...
				    basePicker.dpSetDisplayedMonth(Number(s.month), Number(s.year));
				}
			);
            return this;
        },
        dpmmGetSelected: function() {
            var basePicker = $(this).data('dpBasePicker');
            return basePicker.dpGetSelected();
        },
        dpmmSetSelected: function(d, v, m, e) {
            var basePicker = $(this).data('dpBasePicker');
            return basePicker.dpSetSelected(d, v, m, e);
        }
    });

})(jQuery);