/*
 * drag.js - click & drag DOM elements
 *
 * originally based on Youngpup's dom-drag.js, www.youngpup.net
 */

/**********************************************************
 Further modified from the example by Tim Taylor
 http://tool-man.org/examples/sorting.html

 Changed onMouseMove where it calls group.onDrag and then
 adjusts the offset for changes to the DOM.  If the item
 being moved changed parents it would be off so changed to
 get the absolute offset (recursive northwestOffset).

 **********************************************************/

var Drag = {
    BIG_Z_INDEX : 10000,
    group : null,
    isDragging : false,

    makeDraggable : function(group) {
        group.handle = group;

        if (group.handle){
            group.handle.group = group;
        }

        group.minX = null;
        group.minY = null;
        group.maxX = null;
        group.maxY = null;
        group.threshold = 0;
        group.thresholdY = 0;
        group.thresholdX = 0;

        group.onDragStart = new Function();
        group.onDragEnd = new Function();
        group.onDrag = new Function();

        // TODO: use element.prototype.myFunc
        group.setDragHandle = Drag.setDragHandle;
        group.setDragThreshold = Drag.setDragThreshold;
        group.setDragThresholdX = Drag.setDragThresholdX;
        group.setDragThresholdY = Drag.setDragThresholdY;
        group.constrain = Drag.constrain;
        group.constrainVertical = Drag.constrainVertical;
        group.constrainHorizontal = Drag.constrainHorizontal;

        group.onmousedown = Drag.onMouseDown;
    },

    constrainVertical : function() {
        var nwOffset = Coordinates.northwestOffset(this, true);
        this.minX = nwOffset.x;
        this.maxX = nwOffset.x;
    },

    constrainHorizontal : function() {
        var nwOffset = Coordinates.northwestOffset(this, true);
        this.minY = nwOffset.y;
        this.maxY = nwOffset.y;
    },

    constrain : function(nwPosition, sePosition) {
        this.minX = nwPosition.x;
        this.minY = nwPosition.y;
        this.maxX = sePosition.x;
        this.maxY = sePosition.y;
    },

    setDragHandle : function(handle) {
        if (handle && handle != null)
            this.handle = handle;
        else
            this.handle = this;

        this.handle.group = this;
        this.onmousedown = null;
        this.handle.onmousedown = Drag.onMouseDown;
    },

    setDragThreshold : function(threshold) {
        if (isNaN(parseInt(threshold))) return;

        this.threshold = threshold;
    },

    setDragThresholdX : function(threshold) {
        if (isNaN(parseInt(threshold))) return;

        this.thresholdX = threshold;
    },

    setDragThresholdY : function(threshold) {
        if (isNaN(parseInt(threshold))) return;

        this.thresholdY = threshold;
    },

    onMouseDown : function(event) {
        event = Drag.fixEvent(event);
        Drag.group = this.group;

        var group = this.group;

        if (group){

            var mouse = event.windowCoordinate;
            var nwOffset = Coordinates.northwestOffset(group, true);
            var nwPosition = Coordinates.northwestPosition(group);
            var sePosition = Coordinates.southeastPosition(group);
            var seOffset = Coordinates.southeastOffset(group, true);

            group.originalOpacity = group.style.opacity;
            group.originalZIndex = group.style.zIndex;
            group.initialWindowCoordinate = mouse;
            // TODO: need a better name, but don't yet understand how it
            // participates in the magic while dragging
            group.dragCoordinate = mouse;

            Drag.showStatus(mouse, nwPosition, sePosition, nwOffset, seOffset);

            group.onDragStart(nwPosition, sePosition, nwOffset, seOffset);

            // TODO: need better constraint API
            if (group.minX != null)
                group.minMouseX = mouse.x - nwPosition.x +
                        group.minX - nwOffset.x;
            if (group.maxX != null)
                group.maxMouseX = group.minMouseX + group.maxX - group.minX;

            if (group.minY != null)
                group.minMouseY = mouse.y - nwPosition.y +
                        group.minY - nwOffset.y;
            if (group.maxY != null)
                group.maxMouseY = group.minMouseY + group.maxY - group.minY;

            group.mouseMin = new Coordinate(group.minMouseX, group.minMouseY);
            group.mouseMax = new Coordinate(group.maxMouseX, group.maxMouseY);

            document.onmousemove = Drag.onMouseMove;
            document.onmouseup = Drag.onMouseUp;
        }

        return false;
    },

    showStatus : function(mouse, nwPosition, sePosition, nwOffset, seOffset) {
        /*window.status =
                "mouse: " + mouse.toString() + "    " +
                "NW pos: " + nwPosition.toString() + "    " +
                "SE pos: " + sePosition.toString() + "    " +
                "NW offset: " + nwOffset.toString() + "    " +
                "SE offset: " + seOffset.toString();*/
    },

    onMouseMove : function(event) {
        event = Drag.fixEvent(event);
        var group = Drag.group;
        var mouse = event.windowCoordinate;
        var nwOffset = Coordinates.northwestOffset(group, true);
        var nwPosition = Coordinates.northwestPosition(group);
        var sePosition = Coordinates.southeastPosition(group);
        var seOffset = Coordinates.southeastOffset(group, true);

        Drag.showStatus(mouse, nwPosition, sePosition, nwOffset, seOffset);

        if (!Drag.isDragging) {
            if (group.threshold > 0) {
                var distance = group.initialWindowCoordinate.distance(
                        mouse);
                if (distance < group.threshold) return true;
            } else if (group.thresholdY > 0) {
                var deltaY = Math.abs(group.initialWindowCoordinate.y - mouse.y);
                if (deltaY < group.thresholdY) return true;
            } else if (group.thresholdX > 0) {
                var deltaX = Math.abs(group.initialWindowCoordinate.x - mouse.x);
                if (deltaX < group.thresholdX) return true;
            }

            Drag.isDragging = true;
            group.style["zIndex"] = Drag.BIG_Z_INDEX;
            group.style["opacity"] = 0.75;
        }

        // TODO: need better constraint API
        var adjusted = mouse.constrain(group.mouseMin, group.mouseMax);
        nwPosition = nwPosition.plus(adjusted.minus(group.dragCoordinate));
        nwPosition.reposition(group);
        group.dragCoordinate = adjusted;

        // once dragging has started, the position of the group
        // relative to the mouse should stay fixed.  They can get out
        // of sync if the DOM is manipulated while dragging, so we
        // correct the error here
        //
        // TODO: what we really want to do is find the offset from
        // our corner to the mouse coordinate and adjust to keep it
        // the same

        // changed to be recursive/use absolute offset for corrections
        var offsetBefore = Coordinates.northwestOffset(group, true);
        group.onDrag(nwPosition, sePosition, nwOffset, seOffset);
        var offsetAfter = Coordinates.northwestOffset(group, true);

        if (!offsetBefore.equals(offsetAfter)) {
            var errorDelta = offsetBefore.minus(offsetAfter);
            nwPosition = Coordinates.northwestPosition(group).plus(errorDelta);
            nwPosition.reposition(group);
        }

        return false;
    },

    onMouseUp : function(event) {
        event = Drag.fixEvent(event);
        var group = Drag.group;

        var mouse = event.windowCoordinate;
        var nwOffset = Coordinates.northwestOffset(group, true);
        var nwPosition = Coordinates.northwestPosition(group);
        var sePosition = Coordinates.southeastPosition(group);
        var seOffset = Coordinates.southeastOffset(group, true);

        document.onmousemove = null;
        document.onmouseup   = null;
        group.onDragEnd(nwPosition, sePosition, nwOffset, seOffset);

        if (Drag.isDragging) {
            // restoring zIndex before opacity avoids visual flicker in Firefox
            group.style["zIndex"] = group.originalZIndex;
            group.style["opacity"] = group.originalOpacity;
        }

        Drag.group = null;
        Drag.isDragging = false;

        return false;
    },

    fixEvent : function(event) {
        if (typeof event == 'undefined') event = window.event;
        Coordinates.fixEvent(event);

        return event;
    }
};

/* dragdrop.js
 */

/**********************************************************
 Adapted from the sortable lists example by Tim Taylor
 http://tool-man.org/examples/sorting.html
 Modified by Tom Westcott : http://www.cyberdummy.co.uk
 **********************************************************/

/*
    Modified by Warren Smith for the envisage CMS framework
*/

var DragDrop = {

    firstContainer : null,
    lastContainer : null,
    parent_id : null,
    parent_group : null,

    /* Envisage vars */
    busyItems : new Array(),

    makeListContainer : function(list, group) {
        // each container becomes a linked list node
        if (this.firstContainer == null) {
            this.firstContainer = this.lastContainer = list;
            list.previousContainer = null;
            list.nextContainer = null;
        } else {
            if (list) list.previousContainer = this.lastContainer;
            if (list) list.nextContainer = null;
            this.lastContainer.nextContainer = list;
            this.lastContainer = list;
        }

        // these functions are called when an item is draged over
        // a container or out of a container bounds.  onDragOut
        // is also called when the drag ends with an item having
        // been added to the container
        if (list) list.onDragOver = new Function();
        if (list) list.onDragOut = new Function();
        if (list) list.onDragDrop = new Function();
        if (list) list.group = group;

        if (list) var items = list.getElementsByTagName( "li" );
        if (items){
            for (var i = 0; i < items.length; i++) {
                DragDrop.makeItemDragable(items[i]);
            }
        }
    },

    getDragButton : function(parentNode){
        var childNodes = parentNode.getElementsByTagName("*");
        for(var i = 0; i < childNodes.length; i++){
            if (childNodes[i].getAttribute('envisageControlType') == 'envisageDragButton'){
                return childNodes[i];
            } else {
                var subNodes = childNodes[i].getElementsByTagName("*");
                for (var j = 0; j < subNodes.length; j++){
                    if (subNodes[j].getAttribute('envisageControlType') == 'envisageDragButton'){
                        return subNodes[j];
                    }
                }
            }
        }
    },

    getDragDisabledButton : function(parentNode){
        var childNodes = parentNode.getElementsByTagName("*");
        for(var i = 0; i < childNodes.length; i++){
            if (childNodes[i].getAttribute('envisageControlType') == 'envisageDragDisabledButton'){
                return childNodes[i];
            } else {
                var subNodes = childNodes[i].getElementsByTagName("*");
                for (var j = 0; j < subNodes.length; j++){
                    if (subNodes[j].getAttribute('envisageControlType') == 'envisageDragDisabledButton'){
                        return subNodes[j];
                    }
                }
            }
        }
    },

    disableListItem : function(item) {

        item.group             = null;
        item.onmousedown       = null;
        var dragButton         = this.getDragButton(item);
        var dragDisabledButton = this.getDragDisabledButton(item);

        if (dragDisabledButton)  Element.show(dragDisabledButton);
        if (dragButton)          Element.hide(dragButton);

        //Element.hide('dragButton_'+item.id);
        //Element.show('dragDisabledButton_'+item.id);

        this.setItemAsBusy(item);
    },

    enableListItem : function(item) {

        this.setItemAsNotBusy(item);

        if (!this.itemIsBusy(item)){

            DragDrop.makeItemDragable(item);
            var dragButton         = this.getDragButton(item);
            var dragDisabledButton = this.getDragDisabledButton(item);

            if (dragDisabledButton)  Element.hide(dragDisabledButton);
            if (dragButton)          Element.show(dragButton);

            //Element.show('dragButton_'+item.id);
            //Element.hide('dragDisabledButton_'+item.id);
        }

        DragDrop.makeItemDragable(item.id);
    },

    setItemAsBusy : function(item){
        this.busyItems[this.busyItems.length] = item.id;
    },

    setItemAsNotBusy : function(item){
        var changed    = false;
        var j          = 0;
        var finalArray = [];
        for (var i = 0; i < this.busyItems.length; i++){
            if (item.id == this.busyItems[i] && changed == false){
                changed = true;
            } else {
                finalArray[j] = this.busyItems[i];
                j++;
            }
        }

        this.busyItems = finalArray;
    },

    itemIsBusy : function(item){
        for (var i = 0; i < this.busyItems.length; i++){
            if (this.busyItems[i] == item.id){
                return true;
            } else {
                return false;
            }
        }
    },

    serData : function ( group, theid ) {
        var container = DragDrop.firstContainer;
        var j = 0;
        var string = "";

        while (container != null) {

            if (theid != null && container.id != theid){
                container = container.nextContainer;
                continue;
            }

            if (group != null && container.group != group){
                container = container.nextContainer;
                continue;
            }

            j ++;
            if(j > 1){
                string += ":";
            }
            string += container.id;

            var items = container.getElementsByTagName( "li" );
            string += "(";
            for (var i = 0; i < items.length; i++){
                if(i > 0){
                    string += ",";
                }
                string += items[i].id;
            }
            string += ")";

            container = container.nextContainer;
        }

        return string;
    },

    makeItemDragable : function(item) {
        Drag.makeDraggable(item);

        if (item.dragThreshold) item.setDragThreshold(5);

        // tracks if the item is currently outside all containers
        item.isOutside = false;

        item.onDragStart = DragDrop.onDragStart;
        item.onDrag = DragDrop.onDrag;
        item.onDragEnd = DragDrop.onDragEnd;
    },

    onDragStart : function(nwPosition, sePosition, nwOffset, seOffset) {
        // update all container bounds, since they may have changed
        // on a previous drag
        //
        // could be more smart about when to do this
        var container = DragDrop.firstContainer;
        while (container != null) {
            container.northwest = Coordinates.northwestOffset( container, true );
            container.southeast = Coordinates.southeastOffset( container, true );
            container = container.nextContainer;
        }

        // item starts out over current parent
        this.parentNode.onDragOver();
                parent_id = this.parentNode.id;
                parent_group = this.parentNode.group;
    },

    onDrag : function(nwPosition, sePosition, nwOffset, seOffset) {
        // check if we were nowhere
        if (this.isOutside) {
            // check each container to see if in its bounds
            var container = DragDrop.firstContainer;
            while (container != null) {

                if ((nwOffset.inside( container.northwest, container.southeast ) ||
                    seOffset.inside( container.northwest, container.southeast )) && container.group == parent_group) {
                    // we're inside this one
                    container.onDragOver();
                    this.isOutside = false;

                    // since isOutside was true, the current parent is a
                    // temporary clone of some previous container node and
                    // it needs to be removed from the document
                    var tempParent = this.parentNode;
                    tempParent.removeChild( this );
                    container.appendChild( this );
                    tempParent.parentNode.removeChild( tempParent );
                    break;
                }
                container = container.nextContainer;
            }
            // we're still not inside the bounds of any container
            if (this.isOutside)
                return;

        // check if we're outside our parent's bounds
        } else if (!(nwOffset.inside( this.parentNode.northwest, this.parentNode.southeast ) ||
            seOffset.inside( this.parentNode.northwest, this.parentNode.southeast ))) {

            this.parentNode.onDragOut();
            this.isOutside = true;

            // check if we're inside a new container's bounds
            var container = DragDrop.firstContainer;
            while (container != null) {
                if ((nwOffset.inside( container.northwest, container.southeast ) ||
                    seOffset.inside( container.northwest, container.southeast )) && container.group == parent_group) {
                    // we're inside this one
                    container.onDragOver();
                    this.isOutside = false;
                    this.parentNode.removeChild( this );
                    container.appendChild( this );
                    break;
                }
                container = container.nextContainer;
            }
            // if we're not in any container now, make a temporary clone of
            // the previous container node and add it to the document
            if (this.isOutside) {
                var tempParent = this.parentNode.cloneNode( false );
                this.parentNode.removeChild( this );
                tempParent.appendChild( this );
                // body puts a border or item at bottom of page if do not have this
                                tempParent.style.border = 0;
                document.getElementsByTagName( "body" ).item(0).appendChild( tempParent );
                return;
            }
        }

        // if we get here, we're inside some container bounds, so we do
        // everything the original dragsort script did to swap us into the
        // correct position

        var parent = this.parentNode;

        var item = this;
        var next = DragUtils.nextItem(item);
        while (next != null && this.offsetTop >= next.offsetTop - 2) {
            var item = next;
            var next = DragUtils.nextItem(item);
        }
        if (this != item) {
            DragUtils.swap(this, next);
            return;
        }

        var item = this;
        var previous = DragUtils.previousItem(item);
        while (previous != null && this.offsetTop <= previous.offsetTop + 2) {
            var item = previous;
            var previous = DragUtils.previousItem(item);
        }
        if (this != item) {
            DragUtils.swap(this, item);
            return;
        }
    },

    onDragEnd : function(nwPosition, sePosition, nwOffset, seOffset) {
        // if the drag ends and we're still outside all containers
        // it's time to remove ourselves from the document or add
                // to the trash bin
        if (this.isOutside) {
                        var container = DragDrop.firstContainer;
                        while (container != null) {
                           if(container.id == parent_id)
                           {
                             break;
                           }
                           container = container.nextContainer;
                        }
            this.isOutside = false;
            this.parentNode.removeChild( this );
            container.appendChild( this );
                        this.style["top"] = "0px";
                this.style["left"] = "0px";
                        //var container = DragDrop.firstContainer;
                        //container.appendChild( this );
            return;
        }

        // If the following line is commented out the object stays where it
        // was dragged to on the screen, it can then be locked in place if
        // it is disabled - Warren Smith
        this.parentNode.onDragOut();
        this.parentNode.onDragDrop();
        this.style["top"] = "0px";
        this.style["left"] = "0px";
    }
};

var DragUtils = {
    swap : function(item1, item2) {
        var parent = item1.parentNode;
        parent.removeChild(item1);
        parent.insertBefore(item1, item2);

        item1.style["top"] = "0px";
        item1.style["left"] = "0px";
    },

    nextItem : function(item) {
        var sibling = item.nextSibling;
        while (sibling != null) {
            if (sibling.nodeName == item.nodeName) return sibling;
            sibling = sibling.nextSibling;
        }
        return null;
    },

    previousItem : function(item) {
        var sibling = item.previousSibling;
        while (sibling != null) {
            if (sibling.nodeName == item.nodeName) return sibling;
            sibling = sibling.previousSibling;
        }
        return null;
    }
};
/* coordinates.js
 */

/**********************************************************
 Very minorly modified from the example by Tim Taylor
 http://tool-man.org/examples/sorting.html

 Added Coordinate.prototype.inside( northwest, southeast );

 **********************************************************/

var Coordinates = {
    ORIGIN : new Coordinate(0, 0),

    northwestPosition : function(element) {

        if (element.style){

            var x = parseInt(element.style.left);
            var y = parseInt(element.style.top);
        }

        return new Coordinate(isNaN(x) ? 0 : x, isNaN(y) ? 0 : y);
    },

    southeastPosition : function(element) {
        return Coordinates.northwestPosition(element).plus(
                new Coordinate(element.offsetWidth, element.offsetHeight));
    },

    northwestOffset : function(element, isRecursive) {
        var offset = new Coordinate(element.offsetLeft, element.offsetTop);

        if (!isRecursive) return offset;

        var parent = element.offsetParent;
        while (parent) {
            offset = offset.plus(
                    new Coordinate(parent.offsetLeft, parent.offsetTop));
            parent = parent.offsetParent;
        }
        return offset;
    },

    southeastOffset : function(element, isRecursive) {
        return Coordinates.northwestOffset(element, isRecursive).plus(
                new Coordinate(element.offsetWidth, element.offsetHeight));
    },

    fixEvent : function(event) {
        event.windowCoordinate = new Coordinate(event.clientX, event.clientY);
    }
};

function Coordinate(x, y) {
    this.x = x;
    this.y = y;
}

Coordinate.prototype.toString = function() {
    return "(" + this.x + "," + this.y + ")";
}

Coordinate.prototype.plus = function(that) {
    return new Coordinate(this.x + that.x, this.y + that.y);
}

Coordinate.prototype.minus = function(that) {
    return new Coordinate(this.x - that.x, this.y - that.y);
}

Coordinate.prototype.distance = function(that) {
    var deltaX = this.x - that.x;
    var deltaY = this.y - that.y;

    return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
}

Coordinate.prototype.max = function(that) {
    var x = Math.max(this.x, that.x);
    var y = Math.max(this.y, that.y);
    return new Coordinate(x, y);
}

Coordinate.prototype.constrain = function(min, max) {
    if (min.x > max.x || min.y > max.y) return this;

    var x = this.x;
    var y = this.y;

    if (min.x != null) x = Math.max(x, min.x);
    if (max.x != null) x = Math.min(x, max.x);
    if (min.y != null) y = Math.max(y, min.y);
    if (max.y != null) y = Math.min(y, max.y);

    return new Coordinate(x, y);
}

Coordinate.prototype.reposition = function(element) {
    element.style["top"] = this.y + "px";
    element.style["left"] = this.x + "px";
}

Coordinate.prototype.equals = function(that) {
    if (this == that) return true;
    if (!that || that == null) return false;

    return this.x == that.x && this.y == that.y;
}

// returns true of this point is inside specified box
Coordinate.prototype.inside = function(northwest, southeast) {
    if ((this.x >= northwest.x) && (this.x <= southeast.x) &&
        (this.y >= northwest.y) && (this.y <= southeast.y)) {

        return true;
    }
    return false;
}