import { Session } from 'meteor/session';
import { Random } from 'meteor/random';
import { OHIF } from 'meteor/ohif:core';
import { cornerstone, cornerstoneTools } from 'meteor/ohif:cornerstone';

let activeTool;
let tools = {};
let initialized = false;
let defaultTool = {
    left: 'wwwc',
    right: 'zoom',
    middle: 'pan'
};

const defaultToolConfig = {
    shadow: false,
    shadowColor: '#000000',
    shadowOffsetX: 0,
    shadowOffsetY: 0,
    drawHandlesOnHover: true
};

const buttonNum = {
    'left': 1,
    'right': 2,
    'middle': 4
};

/**
 * Exported "toolManager" Singleton
 */
export const toolManager = {
    init() {
        // if a default tool is globally defined, make it the default tool...
        if (OHIF.viewer.defaultTool) {
            toolManager.setDefaultTool(OHIF.viewer.defaultTool.left);
            toolManager.setDefaultTool(OHIF.viewer.defaultTool.right, 'right');
            toolManager.setDefaultTool(OHIF.viewer.defaultTool.middle, 'middle');
        }

        cornerstoneTools.init();

        tools = {
            length: 'LengthTool',
            angle: 'AngleTool',
            annotate: 'ArrowAnnotateTool',
            wwwc: 'WwwcTool',
            zoom: 'ZoomTool',
            pan: 'PanTool',
            dragProbe: 'DragProbeTool',
            magnify: 'MagnifyTool',
            crosshairs: 'CrosshairsTool',
            stackScroll: 'StackScrollTool',
            ellipticalRoi: 'EllipticalRoiTool',
            rectangleRoi: 'RectangleRoiTool',
            wwwcRegion: 'WwwcRegionTool',
            zoomTouchPinch: 'ZoomTouchPinchTool',
            panMultiTouch: 'PanMultiTouchTool',
            stackScrollMouseWheel: 'StackScrollMouseWheelTool',
            referenceLines: 'ReferenceLinesTool'
        };

        const { textStyle, toolStyle, toolColors } = cornerstoneTools;

        // Set text box background color
        textStyle.setBackgroundColor('transparent');

        // Set the tool font and font size
        // context.font = "[style] [variant] [weight] [size]/[line height] [font family]";
        const fontFamily = 'Roboto, OpenSans, HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif';
        textStyle.setFont('15px ' + fontFamily);

        // Set the tool width
        toolStyle.setToolWidth(2);

        // Set color for inactive tools
        toolColors.setToolColor('rgb(255, 255, 0)'); // yellow

        // Set color for active tools
        toolColors.setActiveColor('rgb(50, 205, 50)'); // limegreen

        initialized = true;
    },
    /**
     * This function searches an object to return the keys that contain a specific value
     *
     * @param object {object} The object to be searched
     * @param value The value to be found
     *
     * @returns {array} The keys for which the object has the specified value
     */
    getKeysByValue(object, value) {
        // http://stackoverflow.com/questions/9907419/javascript-object-get-key-by-value
        return Object.keys(object).filter(key => object[key] === value);
    },

    getMouseButtonMask(button) {
        return buttonNum[button] || undefined;
    },

    configureLoadProcess() {
        // Whenever CornerstoneImageLoadProgress is fired, identify which viewports
        // the "in-progress" image is to be displayed in. Then pass the percent complete
        // via the Meteor Session to the other templates to be displayed in the relevant viewports.

        function handleLoadProgress (e) {
            const eventData = e.detail;
            const viewportIndices = toolManager.getKeysByValue(window.ViewportLoading, eventData.imageId);
            viewportIndices.forEach(viewportIndex => {
                Session.set('CornerstoneLoadProgress' + viewportIndex, eventData.percentComplete);
            });

            const encodedId = OHIF.string.encodeId(eventData.imageId);
            Session.set('CornerstoneThumbnailLoadProgress' + encodedId, eventData.percentComplete);
        }

        cornerstone.events.removeEventListener('cornerstoneimageloadprogress', handleLoadProgress);
        cornerstone.events.addEventListener('cornerstoneimageloadprogress', handleLoadProgress);
    },

    getTools() {
        return Object.keys(tools);
    },

    setActiveTool(toolName, button = 'left') {
        // Using setActiveTool with no arguments activates the default tools for all buttons
        if (!toolName) {
            toolManager.setActiveTool(toolManager.getDefaultTool());
            toolManager.setActiveTool(toolManager.getDefaultTool('right'), 'right');
            toolManager.setActiveTool(toolManager.getDefaultTool('middle'), 'middle');
            return;
        }

        let options = {};
        const mouseButtonMask = toolManager.getMouseButtonMask(button);
        if (mouseButtonMask) {
            options = {
                mouseButtonMask
            }
        }

        // Set active tools for the other buttons than this one
        switch(button) {
            case 'left':
                cornerstoneTools.setToolActive(toolManager.getActiveTool('right'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('right')
                });
                cornerstoneTools.setToolActive(toolManager.getActiveTool('middle'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('middle')
                });
                break;
            case 'right':
                cornerstoneTools.setToolActive(toolManager.getActiveTool('left'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('left')
                });
                cornerstoneTools.setToolActive(toolManager.getActiveTool('middle'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('middle')
                });
                break;
            case 'middle':
                cornerstoneTools.setToolActive(toolManager.getActiveTool('left'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('left')
                });
                cornerstoneTools.setToolActive(toolManager.getActiveTool('right'), {
                    mouseButtonMask: toolManager.getMouseButtonMask('right')
                });
                break;
        }

        cornerstoneTools.setToolActive(toolName, options);
        activeTool[button] = toolName;

        // Enable reactivity
        Session.set('ToolManagerActiveToolUpdated', Random.id());
    },

    instantiateTools(element) {
        // Instantiate all cornerstone tools for the given element
        Object.keys(tools).forEach(toolName => {
            const apiTool = cornerstoneTools[tools[toolName]];
            if (apiTool) {
                cornerstoneTools.addToolForElement(element, apiTool, {
                    name: toolName,
                    configuration: defaultToolConfig
                });

                // Set all tools (except the active tools) passive by default in order to render the external data if exists
                if (!activeTool || !Object.values(activeTool).includes(toolName)) {
                    cornerstoneTools.setToolPassive(toolName);
                }
            }
        });

        // Activate pinch zoom
        cornerstoneTools.setToolActive('zoomTouchPinch', {
            mouseButtonMask: 0,
            isTouchActive: true
        });

        // Activate two-finger pan
        cornerstoneTools.setToolActive('panMultiTouch', {
            mouseButtonMask: 0,
            isTouchActive: true
        });

        // Activate mouse wheel and three (or more) finger stack scroll
        cornerstoneTools.setToolActive('stackScrollMouseWheel', {
            mouseButtonMask: 0,
            isTouchActive: true
        });
    },

    removeToolsForElement(element) {
        Object.keys(tools).forEach(toolName => {
            cornerstoneTools.removeToolForElement(element, toolName);
        });
    },

    getNearbyToolData(element, coords, toolTypes) {
        let pointNearTool = false;
        const nearbyTool = {};

        const toolTypesToCheck = toolTypes || this.getTools();
        toolTypesToCheck.forEach(toolType => {
            const toolData = cornerstoneTools.getToolState(element, toolType);
            if (!toolData) {
                return;
            }

            for (let i = 0; i < toolData.data.length; i++) {
                const data = toolData.data[i];
                const tool = cornerstoneTools.getToolForElement(element, toolType);
                if (tool && typeof tool.pointNearTool === 'function' && tool.pointNearTool(element, data, coords)) {
                    pointNearTool = true;
                    nearbyTool.tool = data;
                    nearbyTool.index = i;
                    nearbyTool.toolType = toolType;
                    break;
                }
            }

            if (pointNearTool === true) {
                return false;
            }
        });

        return pointNearTool ? nearbyTool : undefined;
    },

    getActiveTool(button = 'left') {
        if (!initialized) {
            toolManager.init();
        }

        // If activeTool is not defined, we should set as defaultTool
        if (!activeTool) {
            activeTool = defaultTool;
        }

        return activeTool[button];
    },

    setDefaultTool(tool, button = 'left') {
        defaultTool[button] = tool;
    },

    getDefaultTool(button = 'left') {
        return defaultTool[button];
    },

    activateCommandButton(button) {
        // TODO: Do we need this?
    },

    deactivateCommandButton(button) {
        // TODO: Do we need this?
    }
};

toolManager.init();