import { Session } from 'meteor/session';
import { $ } from 'meteor/jquery';
import { OHIF } from 'meteor/ohif:core';
import { getInstanceClassDefaultViewport } from '../instanceClassSpecificViewport';

// Manage resizing viewports triggered by window resize
export class ResizeViewportManager {
    constructor() {
        this._resizeHandler = null;
        OHIF.log.info('ResizeViewportManager');
    }

    // Reposition Study Series Quick Switch based whether side bars are opened or not
    repositionStudySeriesQuickSwitch() {
        OHIF.log.info('ResizeViewportManager repositionStudySeriesQuickSwitch');

        const activeTab = Session.get('activeContentId');
        if(activeTab === 'viewerTab') {
            const nViewports = OHIF.viewerbase.layoutManager.viewportData.length;

            if(nViewports && nViewports > 1) {
                const viewer = $('#viewer');
                const leftSidebar = viewer.find('.sidebar-left.sidebar-open');
                const rightSidebar = viewer.find('.sidebar-right.sidebar-open');

                const leftQuickSwitch = $('.quickSwitchWrapper.left');
                const rightQuickSwitch = $('.quickSwitchWrapper.right');

                const hasLeftSidebar = leftSidebar.length > 0;
                const hasRightSidebar = rightSidebar.length > 0;

                rightQuickSwitch.removeClass('left-sidebar-only');
                leftQuickSwitch.removeClass('right-sidebar-only');

                let leftOffset = 0;

                if(hasLeftSidebar) {
                    leftOffset = ( leftSidebar.width()/$(window).width() ) * 100;

                    if(!hasRightSidebar) {
                        rightQuickSwitch.addClass('left-sidebar-only');
                    }
                }

                if(hasRightSidebar && !hasLeftSidebar) {
                    leftQuickSwitch.addClass('right-sidebar-only');
                }

                const leftPosition = ( ($('#imageViewerViewports').width() / nViewports) / $(window).width() ) * 100 + leftOffset;
                const rightPosition = 100 - leftPosition;

                leftQuickSwitch.css('right', rightPosition + '%');
                rightQuickSwitch.css('left', leftPosition + '%');
            }
            
        }
    }

    // Relocate dialogs positions
    relocateDialogs(){
        OHIF.log.info('ResizeViewportManager relocateDialogs');

        const bottomRightDialogs = $('#cineDialog, #annotationDialog, #textMarkerOptionsDialog');
        bottomRightDialogs.css({
            top: '', // This removes the CSS property completely
            left: '',
            bottom: 0,
            right: 0
        });

        const centerDialogs = $('.draggableDialog').not(bottomRightDialogs);

        centerDialogs.css({
            top: 0,
            left:0,
            bottom: 0,
            right: 0
        });
    }

    // Resize viewport scrollbars
    resizeScrollbars(element) {
        OHIF.log.info('ResizeViewportManager resizeScrollbars');

        const currentOverlay = $(element).siblings('.imageViewerViewportOverlay');
        const imageControls = currentOverlay.find('.imageControls');
        currentOverlay.find('.imageControls').height($(element).height());

        // Set it's width to its parent's height
        // (because webkit is stupid and can't style vertical sliders)
        const scrollbar = currentOverlay.find('#scrollbar');
        scrollbar.height(scrollbar.parent().height() - 20);

        const currentImageSlider = currentOverlay.find('#imageSlider');
        const overlayHeight = currentImageSlider.parent().height();
        const browserInfo = cornerstoneTools.getBrowserInfo();

        if (browserInfo.indexOf('IE') > -1) {
            currentImageSlider.height(overlayHeight);
        } else {
            currentImageSlider.width(overlayHeight);
        }
    }

    // Resize a single viewport element
    resizeViewportElement(element, fitToWindow = true) {
        let enabledElement;
        try {
            enabledElement = cornerstone.getEnabledElement(element);
        } catch(error) {
            return;
        }

        cornerstone.resize(element, fitToWindow);

        if (enabledElement.fitToWindow === false) {
            const imageId = enabledElement.image.imageId;
            const instance = cornerstoneTools.metaData.get('instance', imageId);
            const instanceClassViewport = getInstanceClassDefaultViewport(instance, enabledElement, imageId);
            cornerstone.setViewport(element, instanceClassViewport);
        }
    }

    // Resize each viewport element
    resizeViewportElements() {
        this.relocateDialogs();

        const viewportResizeTimer = setTimeout(() => {
            this.repositionStudySeriesQuickSwitch();

            const elements = $('.imageViewerViewport').not('.empty');
            elements.each((index, element) => {
                this.resizeViewportElement(element);
                this.resizeScrollbars(element);
            });
        }, 1);
    }

    // Function to override resizeViewportElements function
    setResizeViewportElement(resizeViewportElements) {
        this.resizeViewportElements = resizeViewportElements;
    }

    // Avoid doing DOM manipulation during the resize handler
    // because it is fired very often.
    // Resizing is therefore performed 100 ms after the resize event stops.
    handleResize() {
        clearTimeout(this.resizeTimer);
        this.resizeTimer = setTimeout(() => {
            OHIF.log.info('ResizeViewportManager resizeViewportElements');
            this.resizeViewportElements();
        }, 100);
    }

    /**
     * Returns a unique event handler function associated with a given instance using lazy assignment.
     * @return {function} Returns a unique copy of the event handler of this class.
     */
    getResizeHandler() {
        let resizeHandler = this._resizeHandler;
        if (resizeHandler === null) {
            resizeHandler = this.handleResize.bind(this);
            this._resizeHandler = resizeHandler;
        }
        return resizeHandler;
    }
}