function initHelpers() {
    if ($('cphContent_hbSearch_dropArriveDay')) prefix = 'cphContent_hbSearch_';
    if ($('cphContent_dropArriveDay')) prefix = 'cphContent_';
    if ($('cphContent_hbQuickbook_dropArriveDay')) prefix = 'cphContent_hbQuickbook_';
    if ($('cphPopup_hbQuickbook_dropArriveDay')) prefix = 'cphPopup_hbQuickbook_';
    if (prefix != '') initDates();
    initPopup(document);
    initFeedback();
    initSlideshow();
}

var slideCurrent = 0;
var slideImages;
var slideOpacity = 100;
var slideFadeIntervalId = 0;

function initSlideshow() {
    if ($('slideshow')) {
        slideImages = $('slideshow').getElementsByTagName('img');
        for (var i = 1; i < slideImages.length; i++) {
            slideImages[i].style.opacity = 0;
            slideImages[i].style.filter = 'alpha(opacity=0)';
            slideImages[i].style.display = 'block';
        }
        setTimeout("nextSlide()", 2000);
    }
}

function nextSlide() {
    clearInterval(slideFadeIntervalId);
    slideFadeIntervalId = setInterval("fadeSlide()", 40);
    setTimeout("nextSlide()", 3000);
}

function fadeSlide() {
    var slideNext = slideCurrent + 1;
    if (slideNext >= slideImages.length) slideNext = 0;

    slideOpacity -= 4;
    slideImages[slideCurrent].style.opacity = 0.01 * slideOpacity;
    slideImages[slideCurrent].style.filter = 'alpha(opacity=' + slideOpacity + ')';
    slideImages[slideNext].style.opacity = 0.01 * (100 - slideOpacity);
    slideImages[slideNext].style.filter = 'alpha(opacity=' + (100 - slideOpacity) + ')';

    if (slideOpacity <= 0) {
        slideCurrent = slideNext;
        slideOpacity = 100;
        clearInterval(slideFadeIntervalId);
    }
}


function initDates() {
    addEvent($(prefix + 'dropArriveDay'), 'change', updateDates);
    addEvent($(prefix + 'dropArriveMonth'), 'change', updateDates);
    addEvent($(prefix + 'dropArriveYear'), 'change', updateDates);
    addEvent($(prefix + 'dropLeaveDay'), 'change', updateDates);
    addEvent($(prefix + 'dropLeaveMonth'), 'change', updateDates);
    addEvent($(prefix + 'dropLeaveYear'), 'change', updateDates);

    if ($('arriveCalPop')) {
        YAHOO.namespace("hb.calendar");
        YAHOO.hb.calendar.init = function () {
            YAHOO.hb.calendar.cal1 = new YAHOO.widget.Calendar("cal1", "arriveCalPop", { title: "Arrival date", mindate: "1/1/2008", maxdate: "12/31/2020", close: true });
            YAHOO.hb.calendar.cal1.render();
            YAHOO.hb.calendar.cal1.selectEvent.subscribe(handleSelect1, YAHOO.hb.calendar.cal1, true);
            YAHOO.util.Event.addListener("arriveCalBtn", "click", YAHOO.hb.calendar.cal1.show, YAHOO.hb.calendar.cal1, true);

            YAHOO.hb.calendar.cal2 = new YAHOO.widget.Calendar("cal2", "leaveCalPop", { title: "Leaving date", mindate: "1/1/2008", maxdate: "12/31/2020", close: true });
            YAHOO.hb.calendar.cal2.render();
            YAHOO.hb.calendar.cal2.selectEvent.subscribe(handleSelect2, YAHOO.hb.calendar.cal2, true);
            YAHOO.util.Event.addListener("leaveCalBtn", "click", YAHOO.hb.calendar.cal2.show, YAHOO.hb.calendar.cal2, true);
        }
        YAHOO.hb.calendar.init();
    }

    updateDates(null);
    stayClicked(null);

    if ($(prefix + 'txtLocation') && ($(prefix + 'txtLocation').value == '' | $(prefix + 'txtLocation').value == 'location or postcode' | $(prefix + 'txtLocation').value == 'UK')) {
        $(prefix + 'txtLocation').className = 'watermark';
        $(prefix + 'txtLocation').value = 'location or postcode';
        addEvent($(prefix + 'txtLocation'), 'click', locationClicked);
    }

    if ($(prefix + 'chkStay')) {
        addEvent($(prefix + 'chkStay'), 'click', stayClicked);
    }
    if ($(prefix + 'chkRent')) {
        addEvent($(prefix + 'chkRent'), 'click', stayClicked);
    }
}

function handleSelect1(type, args, obj) {
    var dates = args[0];
    var date = dates[0];
    var year = date[0], month = date[1], day = date[2];

    setSelectedValue(prefix + 'dropArriveYear', year);
    setSelectedValue(prefix + 'dropArriveMonth', month);
    setSelectedValue(prefix + 'dropArriveDay', day);
    YAHOO.hb.calendar.cal1.hide();
    updateDates(null, 'no');
}

function handleSelect2(type, args, obj) {
    var dates = args[0];
    var date = dates[0];
    var year = date[0], month = date[1], day = date[2];

    setSelectedValue(prefix + 'dropLeaveYear', year);
    setSelectedValue(prefix + 'dropLeaveMonth', month);
    setSelectedValue(prefix + 'dropLeaveDay', day);
    YAHOO.hb.calendar.cal2.hide();
    updateDates(null, 'no');
}

function updateDates(e, updateCal) {
    var dateArrive = new Date(getSelectedValue(prefix + 'dropArriveYear'), getSelectedValue(prefix + 'dropArriveMonth') - 1, getSelectedValue(prefix + 'dropArriveDay'));
    var oneday = 1000 * 60 * 60 * 24; // one day in milliseconds
    var dateLeave = new Date();

    var code = '';
    if ($(prefix + 'txtCode')) code = $(prefix + 'txtCode').value;

    if (getSelectedValue(prefix + 'dropArriveYear') > 0 && getSelectedValue(prefix + 'dropArriveMonth') > 0 && getSelectedValue(prefix + 'dropArriveDay') > 0) {

        if (e) {
            offset = 0;
            var target = getTarget(e);
            if (target.id.indexOf('dropArrive') > 0) {
                if (changedLeave == false && nights > 0 && nights < 100) {
                    dateLeave = new Date(dateArrive);
                    dateLeave.setDate(dateLeave.getDate() + nights);
                    setSelectedValue(prefix + 'dropLeaveYear', dateLeave.getFullYear());
                    setSelectedValue(prefix + 'dropLeaveMonth', dateLeave.getMonth() + 1);
                    setSelectedValue(prefix + 'dropLeaveDay', dateLeave.getDate());
                }
            } else if (target.id.indexOf('dropLeave') > 0) {
                dateLeave = new Date(getSelectedValue(prefix + 'dropLeaveYear'), getSelectedValue(prefix + 'dropLeaveMonth') - 1, getSelectedValue(prefix + 'dropLeaveDay'));
                changedLeave = true;
            }
            // if ($("mapplaceholder")) ClearAndUpdateMarkers();		
        }
        else {
            dateLeave = new Date(getSelectedValue(prefix + 'dropLeaveYear'), getSelectedValue(prefix + 'dropLeaveMonth') - 1, getSelectedValue(prefix + 'dropLeaveDay'));
        }

        nights = Math.round((dateLeave - dateArrive + 1) / oneday); // +1 is to avoid dividing by zero

        if (nights > 0) {
            if (nights > 1) {
                $('nights').innerHTML = nights + ' nights';
            } else {
                $('nights').innerHTML = nights + ' night';
            }
        } else {
            $('nights').innerHTML = '';
        }

        if ($(prefix + 'hidVendorId') && $('calendar')) {
            new ajax('/ajax/calendar.aspx?&vendorId=' + $(prefix + 'hidVendorId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
        }

        if ($('arriveCalPop') && updateCal != 'no') {
            if (dateArrive.getFullYear() > 2001) {
                YAHOO.hb.calendar.cal1.select(dateArrive);
                YAHOO.hb.calendar.cal1.cfg.setProperty("pagedate", (dateArrive.getMonth() + 1) + "/" + dateArrive.getFullYear());
                YAHOO.hb.calendar.cal1.render();
            }
            if (dateLeave.getFullYear() > 2001) {
                YAHOO.hb.calendar.cal2.select(dateLeave);
                YAHOO.hb.calendar.cal2.cfg.setProperty("pagedate", (dateLeave.getMonth() + 1) + "/" + dateLeave.getFullYear());
                YAHOO.hb.calendar.cal2.render();
            }
        }
    }

    if (e) disableNextButton();
}

function disableNextButton() {
    if ($(prefix + 'btnNext')) $(prefix + 'btnNext').disabled = true;
    if ($('message')) $('message').style.visibility = 'visible';
}

function locationClicked(e) {
    if ($(prefix + 'txtLocation').value == 'location or postcode') {
        $(prefix + 'txtLocation').value = '';
        $(prefix + 'txtLocation').className = '';
    }
}

function stayClicked(e) {
    if ($(prefix + 'chkStay')) {
        if ($(prefix + 'chkStay').checked || $(prefix + 'chkRent').checked) {
            $('leavingrow').style.visibility = 'visible';
            $('nightsrow').style.visibility = 'visible';
            $('arrivingcell').innerHTML = 'Arriving:';
        } else {
            $('leavingrow').style.visibility = 'hidden';
            $('nightsrow').style.visibility = 'hidden';
            $('arrivingcell').innerHTML = 'Date:';
        }
    }
}

function setDate(year, month, day) {
    var dateArrive = new Date(year, month - 1, day);
    setSelectedValue(prefix + 'dropArriveYear', year);
    setSelectedValue(prefix + 'dropArriveMonth', month);
    setSelectedValue(prefix + 'dropArriveDay', day);

    if (nights <= 0) nights = 1;
    offset = 0;

    dateLeave = new Date(dateArrive);
    dateLeave.setDate(dateLeave.getDate() + nights);
    setSelectedValue(prefix + 'dropLeaveYear', dateLeave.getFullYear());
    setSelectedValue(prefix + 'dropLeaveMonth', dateLeave.getMonth() + 1);
    setSelectedValue(prefix + 'dropLeaveDay', dateLeave.getDate());

    var code = '';
    if ($(prefix + 'txtCode')) code = $(prefix + 'txtCode').value;

    if ($(prefix + 'hidVendorId') && $('calendar')) {
        new ajax('/ajax/calendar.aspx?&vendorId=' + $(prefix + 'hidVendorId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
    }
    else if (currentVendor != '' && $('calendar')) {
        new ajax('/ajax/calendar.aspx?&vendorId=' + currentVendor + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
        new ajax('/ajax/setdate.aspx?dateArrive=' + standardDate(dateArrive), {});
    }

    disableNextButton();
}


function initPopup(target) {
    var as, popfun;
    as = target.getElementsByTagName('a');
    for (var i = 0; i < as.length; i++) {
        if (as[i].target && as[i].target != '_blank') {

            popfun = function () {
                var width = 700;
                var height = 500;
                var offset = 0;
                var target = this.target;

                if (this.target == 'room') { width = 500; height = 300; }
                if (this.target == 'vendor') { width = 700; height = 500; }
                if (this.target == 'photo') { width = 514; height = 420; offset = 40; }

                var left = 200 + offset;
                var top = 140 + offset;
                var windowAttributes = 'width=' + width + ',height=' + height + ',left=' + left + ',top=' + top + ',scrollbars=yes,location=no,toolbar=no,status=yes,resizable=yes';

                var theWindow = window.open(this.href, target, windowAttributes);
                theWindow.focus();
                return false;
            }
            as[i].onclick = popfun;
        }
    }
}

function showBusy(id) {
    $(id).style.display = 'inline';
}

function bookmark() {
    if (navigator.appName == "Microsoft Internet Explorer") {
        var url = window.location;
        var who = "Historic Britain";
        window.external.AddFavorite(url, who);
    } else {
        alert('Please press Ctrl+D to bookmark this page.');
    }
}

function vendorBook(vendorId, type) {
    if (type == 'Stay') {
        window.opener.location = '/book/rooms.aspx?v=' + vendorId;
    } else if (type == 'Rent') {
        window.opener.location = '/book/let.aspx?v=' + vendorId;
    } else {
        window.opener.location = '/book/tickets.aspx?v=' + vendorId;
    }
    window.close();
}

function jumpWeeks(num) {
    offset += num;
    updateDates();
}

function goClick() {
    if (nights <= 0 && ($(prefix + 'chkStay').checked || $(prefix + 'chkRent').checked)) {
        $('nights').innerHTML = '<b>Please check your dates.</b>';
        return false;
    } else {
        return true;
    }
}

function initFeedback() {
    if ($('showmorefeedback')) {
        var i = 1;
        while ($('vendorfeedback' + i)) {
            $('vendorfeedback' + i).style.display = 'none';
            i++;
        }
        addEvent($('showmorefeedback'), 'click', showMoreFeedback);
    }
}

function showMoreFeedback() {
    feedbackSection++;
    $('vendorfeedback' + feedbackSection).style.display = 'block';
    if (!$('vendorfeedback' + (feedbackSection + 1))) {
        $('showmorefeedback').style.display = 'none';
    }
}


// Let's go

var prefix = '';
var offset = 0;
var changedLeave = false;
var nights = 1;
var feedbackSection = 0;
addEvent(window, 'load', initHelpers);



// Utility functions - mostly pinched from elsewhere // 

var Class = {
    create: function () {
        return function () {
            this.initialize.apply(this, arguments);
        }
    }
}

Object.extend = function (destination, source) {
    for (property in source) {
        destination[property] = source[property];
    }
    return destination;
}

Function.prototype.bind = function (object) {
    var __method = this;
    return function () {
        return __method.apply(object, arguments);
    }
}


function addEvent(elm, evType, fn, useCapture) {
    if (elm.addEventListener) {
        elm.addEventListener(evType, fn, useCapture);
        return true;
    } else if (elm.attachEvent) {
        var r = elm.attachEvent('on' + evType, fn);
        return r;
    }
}

function getTarget(e) {
    var targ;
    if (!e) var e = window.event;
    if (e.target) targ = e.target;
    else if (e.srcElement) targ = e.srcElement;
    if (targ.nodeType == 3) // defeat Safari bug
        targ = targ.parentNode;
    return targ;
}

function $(id) {
    return document.getElementById(id);
}

function getSelectedValue(id) {
    var dropdown = $(id);
    if (dropdown.options.length > 0) {
        return dropdown.options[dropdown.selectedIndex].value;
    } else {
        return null;
    }
}

function setSelectedValue(id, value) {
    var dropdown = $(id);
    if (dropdown.options.length > 0) {
        for (var i = 0; i < dropdown.options.length; i++) {
            if (dropdown.options[i].value == value) {
                dropdown.selectedIndex = i;
                break;
            }
        }
    }
}

function standardDate(d) {
    var theMonth = d.getMonth() + 1;
    return (d.getFullYear() + '-' + theMonth + '-' + d.getDate());
}

document.getElementsByClassName = function (className) {
    var children = document.getElementsByTagName('*') || document.all;
    var elements = new Array();

    for (var i = 0; i < children.length; i++) {
        var child = children[i];
        var classNames = child.className.split(' ');
        for (var j = 0; j < classNames.length; j++) {
            if (classNames[j] == className) {
                elements.push(child);
                break;
            }
        }
    }
    return elements;
}

if (!Array.indexOf) {
    Array.prototype.indexOf = function (obj) {
        for (var i = 0; i < this.length; i++) {
            if (this[i] == obj) {
                return i;
            }
        }
        return -1;
    }
}


//-------------------------

ajax = Class.create();
ajax.prototype = {
    initialize: function (url, options) {
        this.transport = this.getTransport();
        this.postBody = options.postBody || '';
        this.method = options.method || 'post';
        this.onComplete = options.onComplete || null;
        this.update = $(options.update) || null;
        this.request(url);
    },

    request: function (url) {
        this.transport.open(this.method, url, true);
        this.transport.onreadystatechange = this.onStateChange.bind(this);
        if (this.method == 'post') {
            this.transport.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
            if (this.transport.overrideMimeType) this.transport.setRequestHeader('Connection', 'close');
        }
        this.transport.send(this.postBody);
    },

    onStateChange: function () {
        if (this.transport.readyState == 4 && this.transport.status == 200) {
            if (this.onComplete)
                setTimeout(function () { this.onComplete(this.transport); } .bind(this), 10);
            if (this.update)
                setTimeout(function () {
                    var response = this.transport.responseText;
                    // Remove form tag from response or IE throws a wobbly
                    response = response.replace(/<\/?form[^>]*?>/ig, '')
                    // Remove viewstate tags to be kind to .Net
                    response = response.replace(/<input type="hidden" name="__[^>]*?>/ig, '')
                    // Update the target element
                    this.update.innerHTML = response;
                } .bind(this), 10);
            this.transport.onreadystatechange = function () { };
        }
    },

    getTransport: function () {
        if (window.ActiveXObject) return new ActiveXObject('Microsoft.XMLHTTP');
        else if (window.XMLHttpRequest) return new XMLHttpRequest();
        else return false;
    }
};