/*****************************************************************************
 * Open MCT, Copyright (c) 2014-2022, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Open MCT includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/

import {
    createOpenMct,
    resetApplicationState
} from 'utils/testing';
import Vue from 'vue';
import Layout from './Layout.vue';

describe('Open MCT Layout:', () => {
    let openmct;
    let element;
    let components;

    beforeEach((done) => {
        openmct = createOpenMct();
        openmct.on('start', done);

        // to silence error from BrowseBar.vue
        spyOn(openmct.objectViews, 'get')
            .and.callFake(() => []);

        openmct.startHeadless();
    });

    afterEach(() => {
        return resetApplicationState(openmct);
    });

    describe('the pane:', () => {
        it('is displayed on layout load', async () => {
            await createLayout();
            await Vue.nextTick();

            Object.entries(components).forEach(([name, component]) => {
                expect(
                    component.pane
                ).toBeTruthy();

                expect(
                    isCollapsed(component.pane)
                ).toBeFalse();
            });
        });

        it('is collapsed on layout load if specified by a hide param', async () => {
            setHideParams();

            await createLayout();
            await Vue.nextTick();

            Object.entries(components).forEach(([name, component]) => {
                expect(
                    isCollapsed(component.pane)
                ).toBeTrue();
            });
        });

        it('on toggle collapses if expanded', async () => {
            await createLayout();
            toggleCollapseButtons();
            await Vue.nextTick();

            Object.entries(components).forEach(([name, component]) => {
                expect(
                    openmct.router.getSearchParam(component.param)
                ).toEqual('true');

                expect(
                    isCollapsed(component.pane)
                ).toBeTrue();
            });
        });

        it('on toggle expands if collapsed', async () => {
            setHideParams();

            await createLayout();
            toggleExpandButtons();
            await Vue.nextTick();

            Object.entries(components).forEach(([name, component]) => {
                expect(
                    openmct.router.getSearchParam(component.param)
                ).not.toEqual('true');

                expect(
                    isCollapsed(component.pane)
                ).toBeFalse();
            });
        });
    });

    async function createLayout() {
        const el = document.createElement('div');
        const child = document.createElement('div');
        el.appendChild(child);

        element = await new Vue({
            el,
            components: {
                Layout
            },
            provide: {
                openmct
            },
            template: `<Layout ref="layout"/>`
        }).$mount().$el;

        setComponents();
    }

    function setComponents() {
        components = {
            tree: {
                param: 'hideTree',
                pane: element.querySelector('.l-shell__pane-tree'),
                collapseButton: element.querySelector('.l-shell__pane-tree .l-pane__collapse-button'),
                expandButton: element.querySelector('.l-shell__pane-tree .l-pane__expand-button')
            },
            inspector: {
                param: 'hideInspector',
                pane: element.querySelector('.l-shell__pane-inspector'),
                collapseButton: element.querySelector('.l-shell__pane-inspector .l-pane__collapse-button'),
                expandButton: element.querySelector('.l-shell__pane-inspector .l-pane__expand-button')
            }
        };
    }

    function isCollapsed(el) {
        return el.classList.contains('l-pane--collapsed');
    }

    function setHideParams() {
        Object.entries(components).forEach(([name, component]) => {
            openmct.router.setSearchParam(component.param, true);
        });
    }

    function toggleCollapseButtons() {
        Object.entries(components).forEach(([name, component]) => {
            component.collapseButton.click();
        });
    }

    function toggleExpandButtons() {
        Object.entries(components).forEach(([name, component]) => {
            component.expandButton.click();
        });
    }
});