var activeTool;

var tools = {};

var initialized = false;

function configureTools() {
    // Set the configuration for the multitouch pan tool
    var multiTouchPanConfig = {
        testPointers: function(eventData) {
            return (eventData.numPointers >= 3);
        }
    };
    cornerstoneTools.panMultiTouch.setConfiguration(multiTouchPanConfig);
}

toolManager = {
    init: function() {
        toolManager.addTool('wwwc', {
            mouse: cornerstoneTools.wwwc,
            touch: cornerstoneTools.wwwcTouchDrag
        });
        toolManager.addTool('zoom', {
            mouse: cornerstoneTools.zoom,
            touch: cornerstoneTools.zoomTouchDrag
        });
        toolManager.addTool('wwwcRegion', {
            mouse: cornerstoneTools.wwwcRegion,
            touch: cornerstoneTools.wwwcRegionTouch
        });
        toolManager.addTool('dragProbe', {
            mouse: cornerstoneTools.dragProbe,
            touch: cornerstoneTools.dragProbeTouch
        });
        toolManager.addTool('pan', {
            mouse: cornerstoneTools.pan,
            touch: cornerstoneTools.panTouchDrag
        });
        toolManager.addTool('stackScroll', {
            mouse: cornerstoneTools.stackScroll,
            touch: cornerstoneTools.stackScrollTouchDrag
        });
        toolManager.addTool('length', {
            mouse: cornerstoneTools.length,
            touch: cornerstoneTools.lengthTouch
        });
        toolManager.addTool('angle', {
            mouse: cornerstoneTools.simpleAngle,
            touch: cornerstoneTools.simpleAngleTouch
        });
        toolManager.addTool('magnify', {
            mouse: cornerstoneTools.magnify,
            touch: cornerstoneTools.magnifyTouchDrag
        });
        toolManager.addTool('ellipticalRoi', {
            mouse: cornerstoneTools.ellipticalRoi,
            touch: cornerstoneTools.ellipticalRoiTouch
        });
        toolManager.addTool('rectangleRoi', {
            mouse: cornerstoneTools.rectangleRoi,
            touch: cornerstoneTools.rectangleRoiTouch
        });
        toolManager.addTool('annotate', {
            mouse: cornerstoneTools.arrowAnnotate,
            touch: cornerstoneTools.arrowAnnotateTouch
        });
        activeTool = OHIF.viewer.defaultTool;

        configureTools();
        initialized = true;
    },
    addTool: function(name, base) {
        tools[name] = base;
    },
    setActiveTool: function(tool) {
        if (!initialized) {
            toolManager.init();
        }

        $('#toolbar .btn-group button').removeClass('active');
        var toolButton = document.getElementById(tool);
        toolButton.classList.add('active');

        $('.imageViewerViewport').each(function(index, element) {
            var canvases = $(element).find('canvas');
            if (!element.classList.contains('empty') && canvases.length > 0) {
                // First, deactivate the current active tool
                tools[activeTool].mouse.deactivate(element, 1);

                if (tools[activeTool].touch) {
                    tools[activeTool].touch.deactivate(element);
                }

                // First, get the stack toolData
                var toolData = cornerstoneTools.getToolState(element, 'stack');
                if (!toolData || !toolData.data || !toolData.data.length) {
                    return;
                }

                // Get the imageIds for this element
                var imageIds = toolData.data[0].imageIds;

                // Deactivate all the middle mouse, right click, and scroll wheel tools
                cornerstoneTools.pan.deactivate(element);
                cornerstoneTools.zoom.deactivate(element);
                cornerstoneTools.zoomWheel.deactivate(element);
                cornerstoneTools.stackScrollWheel.deactivate(element);

                // Reactivate the relevant scrollwheel tool for this element
                if (imageIds.length > 1) {
                    // scroll is the default tool for middle mouse wheel for stacks
                    cornerstoneTools.stackScrollWheel.activate(element);
                } else {
                    // zoom is the default tool for middle mouse wheel for single images (non stacks)
                    cornerstoneTools.zoomWheel.activate(element);
                }

                // This block ensures that the middle mouse and scroll tools keep working
                if (tool === 'pan') {
                    cornerstoneTools.pan.activate(element, 3); // 3 means left mouse button and middle mouse button
                    cornerstoneTools.zoom.activate(element, 4); // zoom is the default tool for right mouse button
                } else if (tool === 'zoom') {
                    cornerstoneTools.pan.activate(element, 2); // pan is the default tool for middle mouse button
                    cornerstoneTools.zoom.activate(element, 5); // 5 means left mouse button and right mouse button
                } else {
                    // Reactivate the middle mouse and right click tools
                    cornerstoneTools.pan.activate(element, 2); // pan is the default tool for middle mouse button
                    cornerstoneTools.zoom.activate(element, 4); // zoom is the default tool for right mouse button

                    // Activate the chosen tool
                    tools[tool].mouse.activate(element, 1);
                }

                if (tools[tool].touch) {
                    tools[tool].touch.activate(element);
                }

                cornerstoneTools.zoomTouchPinch.activate(element);
                cornerstoneTools.panMultiTouch.activate(element);
            }
        });
        activeTool = tool;
    },
    getActiveTool: function() {
        if (!activeTool) {
            activeTool = OHIF.viewer.defaultTool;
        }
        return activeTool;
    },
    setDefaultTool: function(tool) {
        OHIF.viewer.defaultTool = tool;
    },
    getDefaultTool: function() {
        return OHIF.viewer.defaultTool;
    }
};