import { OHIF } from 'meteor/ohif:core';
import { cornerstone, cornerstoneTools } from 'meteor/ohif:cornerstone';

// Delete a lesion if Ctrl+D or DELETE is pressed while a lesion is selected
const keys = {
    D: 68,
    DELETE: 46
};

// Defined the toolTypes for which the delete dialog will be displayed when the keys are pressed
const toolTypes = [
    'bidirectional',
    'targetCR',
    'targetUN',
    'nonTarget',
    'length',
    'ellipticalRoi',
    'rectangleRoi'
];

// Flag to prevent dialog from being displayed twice
let locked = false;

// Handler to unlock the keydown handling
const unlock = () => {
    locked = false;
};

function removeMeasurementTimepoint(data, index, toolType, element) {
    let { imageId } = data;
    if (!imageId) {
        const enabledElement = cornerstone.getEnabledElement(element);
        imageId = enabledElement.image.imageId;
    }

    cornerstoneTools.removeToolState(element, toolType, data);
    cornerstone.updateImage(element);
}

// TODO = Check if we have the same function already in Cornerstone Tools
function getNearbyToolData(element, coords) {
    const Viewerbase = OHIF.viewerbase;
    const allTools = Viewerbase.toolManager.getTools();
    let pointNearTool = false;
    const isTouchDevice = Viewerbase.helpers.isTouchDevice();
    const nearbyTool = {};

    toolTypes.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];

            let toolInterface;
            if (isTouchDevice) {
                toolInterface = allTools[toolType].touch;
            } else {
                toolInterface = allTools[toolType].mouse;
            }

            if (toolInterface.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;
}

function keyDownCallback(event) {
    const eventData = event.detail;
    const keyCode = eventData.which;

    // Stop here if the locked flag is set to true
    if (locked) return;

    if (keyCode === keys.DELETE ||
        (keyCode === keys.D && eventData.event.ctrlKey === true)) {

        const nearbyToolData = getNearbyToolData(eventData.element, eventData.currentPoints.canvas);

        if (!nearbyToolData || nearbyToolData.tool.isCreating) return;

        const dialogSettings = {
            class: 'themed',
            title: 'Delete measurements',
            message: 'Are you sure you want to delete this measurement?',
            position: eventData.currentPoints.page
        };

        // Set the locked flag to true
        locked = true;

        // TODO= Refactor this so the confirmation dialog is an
        // optional settable callback in the tool's configuration
        OHIF.ui.showDialog('dialogConfirm', dialogSettings).then(() => {
            unlock();
            removeMeasurementTimepoint(nearbyToolData.tool,
                nearbyToolData.index,
                nearbyToolData.toolType,
                eventData.element
            );

            // Notify that viewer suffered changes
            OHIF.measurements.triggerTimepointUnsavedChanges('deleted');
        }).catch(unlock);
    }
}

// module/private exports
const tool = cornerstoneTools.keyboardTool(keyDownCallback);
tool.toolTypes = toolTypes;
cornerstoneTools.deleteLesionKeyboardTool = tool;