text: /**
   * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
   */
  
  /* globals document, Event */
  
  import WidgetResize from '../src/widgetresize';
  
  // ClassicTestEditor can't be used, as it doesn't handle the focus, which is needed to test resizer visual cues.
  import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';
  import ArticlePluginSet from '@ckeditor/ckeditor5-core/tests/_utils/articlepluginset';
  
  import { toWidget } from '../src/utils';
  import { setData as setModelData } from '@ckeditor/ckeditor5-engine/src/dev-utils/model';
  
  import { resizerMouseSimulator, focusEditor, getHandleCenterPoint, getWidgetDomParts } from './widgetresize/_utils/utils';
  
  describe( 'WidgetResize', () => {
  	let editor, editorElement, widget, mouseListenerSpies, commitStub;
  	const INITIAL_WIDGET_WIDTH = '25%';
  
  	beforeEach( async () => {
  		editorElement = createEditorElement();
  		editor = await createEditor( editorElement );
  
  		setModelData( editor.model, '[<widget></widget>]' );
  
  		focusEditor( editor );
  
  		widget = editor.editing.view.document.getRoot().getChild( 0 );
  
  		// It's crucial to have a precisely defined editor size for this test suite.
  		editor.editing.view.change( writer => {
  			const viewEditableRoot = editor.editing.view.document.getRoot();
  			writer.setAttribute( 'style', 'width: 400px; padding: 0px; overflow: hidden', viewEditableRoot );
  		} );
  
  		commitStub = sinon.stub();
  
  		mouseListenerSpies = {
  			down: sinon.spy( WidgetResize.prototype, '_mouseDownListener' ),
  			move: sinon.spy( WidgetResize.prototype, '_mouseMoveListener' ),
  			up: sinon.spy( WidgetResize.prototype, '_mouseUpListener' )
  		};
  	} );
  
  	afterEach( () => {
  		editorElement.remove();
  
  		for ( const stub of Object.values( mouseListenerSpies ) ) {
  			stub.restore();
  		}
  
  		if ( editor ) {
  			return editor.destroy();
  		}
  	} );
  
  	describe( 'plugin', () => {
  		it( 'is loaded', () => {
  			expect( editor.plugins.get( WidgetResize ) ).to.be.instanceOf( WidgetResize );
  		} );
  	} );
  
  	describe( 'mouse listeners', () => {
  		beforeEach( () => {
  			createResizer();
  		} );
  
  		it( 'don\'t break when called with unexpected element', () => {
  			const unrelatedElement = document.createElement( 'div' );
  
  			editor.plugins.get( WidgetResize )._mouseDownListener( {}, {
  				target: unrelatedElement
  			} );
  		} );
  
  		it( 'passes new width to the options.onCommit()', () => {
  			const usedResizer = 'top-right';
  			const domParts = getWidgetDomParts( editor, widget, usedResizer );
  			const initialPointerPosition = getHandleCenterPoint( domParts.widget, usedResizer );
  			const finalPointerPosition = initialPointerPosition.clone().moveBy( 20, 0 );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  
  			expect( commitStub.callCount ).to.equal( 1 );
  			sinon.assert.calledWithExactly( commitStub, '120px' );
  		} );
  
  		it( 'are detached when plugin is destroyed', async () => {
  			await editor.destroy();
  			const plugin = editor.plugins.get( WidgetResize );
  			editor = null;
  
  			const event = new Event( 'mousedown', { bubbles: true } );
  			document.body.dispatchEvent( event );
  
  			// Ensure nothing got called.
  			expect( plugin._mouseDownListener.callCount ).to.equal( 0 );
  		} );
  
  		it( 'nothing bad happens if activeResizer got unset', () => {
  			createResizer( {
  				isCentered: () => true
  			} );
  
  			const usedResizer = 'top-right';
  			const domParts = getWidgetDomParts( editor, widget, usedResizer );
  			const initialPointerPosition = getHandleCenterPoint( domParts.widget, usedResizer );
  
  			editor.plugins.get( WidgetResize )._getResizerByHandle = sinon.stub().returns( null );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, initialPointerPosition );
  			// No exception should be thrown.
  		} );
  	} );
  
  	describe( 'visibility', () => {
  		beforeEach( () => {
  			createResizer();
  		} );
  
  		it( 'it\'s hidden when no widget is focused', () => {
  			// This particular test needs a paragraph, so that widget is no longer focused.
  			setModelData( editor.model, '<widget></widget><paragraph>[]</paragraph>' );
  
  			const allResizers = editor.ui.getEditableElement().querySelectorAll( '.ck-widget__resizer__handle' );
  
  			for ( const resizer of allResizers ) {
  				expect( isVisible( resizer ) ).to.be.false;
  			}
  		} );
  
  		it( 'it\'s visible once the widget is focused', () => {
  			// Widget is focused by default.
  			const allResizers = editor.ui.getEditableElement().querySelectorAll( '.ck-widget__resizer__handle' );
  
  			for ( const resizer of allResizers ) {
  				expect( isVisible( resizer ) ).to.be.true;
  			}
  		} );
  
  		function isVisible( element ) {
  			// Checks if the DOM element is visible to the end user.
  			return element.offsetParent !== null && !element.classList.contains( 'ck-hidden' );
  		}
  	} );
  
  	describe( 'integration (pixels)', () => {
  		describe( 'aligned widget', () => {
  			beforeEach( () => {
  				createResizer();
  			} );
  
  			it( 'properly sets the state for subsequent resizes', () => {
  				const usedResizer = 'top-right';
  				const domParts = getWidgetDomParts( editor, widget, usedResizer );
  				const initialPointerPosition = getHandleCenterPoint( domParts.widget, usedResizer );
  
  				const intermediatePointerPosition = initialPointerPosition.clone().moveBy( 50, 0 );
  				resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, intermediatePointerPosition );
  				sinon.assert.calledWithExactly( commitStub.firstCall, '150px' );
  
  				const finalPointerPosition = intermediatePointerPosition.clone().moveBy( 50, 0 );
  				resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  				sinon.assert.calledWithExactly( commitStub.secondCall, '200px' );
  
  				expect( commitStub.callCount ).to.equal( 2 );
  			} );
  
  			it( 'shrinks correctly with left-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: 20, y: -10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'shrinks correctly with right-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: -20, y: -10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'shrinks correctly with left-top handler', generateResizeTest( {
  				usedHandle: 'top-left',
  				movePointerBy: { x: 20, y: 10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'shrinks correctly with right-top handler', generateResizeTest( {
  				usedHandle: 'top-right',
  				movePointerBy: { x: -20, y: 10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'enlarges correctly with left-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: -10, y: 10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 10, y: 10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-bottom handler, y axis only', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 0, y: 20 },
  				expectedWidth: '140px'
  			} ) );
  
  			it( 'enlarges correctly with right-bottom handler, x axis only', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 40, y: 0 },
  				expectedWidth: '140px'
  			} ) );
  
  			it( 'enlarges correctly with left-top handler', generateResizeTest( {
  				usedHandle: 'top-left',
  				movePointerBy: { x: -20, y: -10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-top handler', generateResizeTest( {
  				usedHandle: 'top-right',
  				movePointerBy: { x: 20, y: 10 },
  				expectedWidth: '120px'
  			} ) );
  		} );
  
  		describe( 'centered widget', () => {
  			beforeEach( () => {
  				createResizer( {
  					isCentered: () => true
  				} );
  			} );
  
  			it( 'shrinks correctly with left-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: 10, y: -10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'shrinks correctly with right-bottom handler', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: -10, y: -10 },
  				expectedWidth: '80px'
  			} ) );
  
  			it( 'enlarges correctly with right-bottom handler, x axis only', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 10, y: 0 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-bottom handler, y axis only', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 0, y: 10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with left-bottom handler, x axis only', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: -10, y: 0 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with left-bottom handler, y axis only', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: 0, y: 10 },
  				expectedWidth: '120px'
  			} ) );
  
  			// --- top handlers ---
  
  			it( 'enlarges correctly with left-top handler', generateResizeTest( {
  				usedHandle: 'top-left',
  				movePointerBy: { x: -10, y: -10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with left-top handler, y axis only', generateResizeTest( {
  				usedHandle: 'top-left',
  				movePointerBy: { x: 0, y: -10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-top handler', generateResizeTest( {
  				usedHandle: 'top-right',
  				movePointerBy: { x: 10, y: -10 },
  				expectedWidth: '120px'
  			} ) );
  
  			it( 'enlarges correctly with right-top handler, y axis only', generateResizeTest( {
  				usedHandle: 'top-right',
  				movePointerBy: { x: 0, y: -10 },
  				expectedWidth: '120px'
  			} ) );
  		} );
  	} );
  
  	describe( 'integration (percents)', () => {
  		describe( 'side aligned widget', () => {
  			beforeEach( () => {
  				createResizer( {
  					unit: undefined
  				} );
  			} );
  
  			it( 'properly sets the state for subsequent resizes', () => {
  				const usedResizer = 'top-right';
  				const domParts = getWidgetDomParts( editor, widget, usedResizer );
  				const initialPointerPosition = getHandleCenterPoint( domParts.widget, usedResizer );
  
  				const intermediatePointerPosition = initialPointerPosition.clone().moveBy( 100, 0 );
  				resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, intermediatePointerPosition );
  				sinon.assert.calledWithExactly( commitStub.firstCall, '50%' );
  
  				const finalPointerPosition = intermediatePointerPosition.clone().moveBy( 100, 0 );
  				resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  				sinon.assert.calledWithExactly( commitStub.secondCall, '75%' );
  
  				expect( commitStub.callCount ).to.equal( 2 );
  			} );
  
  			it( 'shrinks correctly with bottom-left handler', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: 10, y: -10 },
  				expectedWidth: '22.5%'
  			} ) );
  		} );
  
  		describe( 'centered widget', () => {
  			beforeEach( () => {
  				createResizer( {
  					isCentered: () => true,
  					unit: undefined
  				} );
  			} );
  
  			it( 'shrinks correctly with bottom-left handler', generateResizeTest( {
  				usedHandle: 'bottom-left',
  				movePointerBy: { x: 10, y: -10 },
  				expectedWidth: '20%'
  			} ) );
  
  			it( 'enlarges correctly with bottom-right handler', generateResizeTest( {
  				usedHandle: 'bottom-right',
  				movePointerBy: { x: 0, y: 5 },
  				expectedWidth: '27.5%'
  			} ) );
  
  			it( 'enlarges correctly an image with unsupported width unit', () => {
  				editor.editing.view.change( writer => {
  					writer.setStyle( 'width', '100pt', widget );
  				} );
  
  				generateResizeTest( {
  					usedHandle: 'bottom-right',
  					movePointerBy: { x: 0, y: 5 },
  					expectedWidth: '36.67%'
  				} )();
  			} );
  		} );
  
  		it( 'doesn\'t call options.onCommit() in case of no change', () => {
  			const commitStub = sinon.stub();
  			createResizer( {
  				onCommit: commitStub
  			} );
  
  			const domParts = getWidgetDomParts( editor, widget, 'top-left' );
  
  			resizerMouseSimulator.down( editor, domParts.resizeHandle );
  			resizerMouseSimulator.up( editor );
  			expect( commitStub.callCount, 'call count' ).to.be.eql( 0 );
  		} );
  
  		// Note that ultimately width should be changed, but through a model converter, not with direct view changes (#6060).
  		it( 'restores the original view width after resize is done', () => {
  			createResizer();
  
  			const usedHandle = 'bottom-right';
  			const domParts = getWidgetDomParts( editor, widget, usedHandle );
  			const finalPointerPosition = getHandleCenterPoint( domParts.widget, usedHandle ).moveBy( 40, 40 );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  
  			expect( widget.getStyle( 'width' ) ).to.equal( INITIAL_WIDGET_WIDTH );
  		} );
  
  		// Verify render count https://github.com/ckeditor/ckeditor5-widget/pull/122#issuecomment-617012777.
  		it( 'renders the final result in one step', () => {
  			const renderListener = sinon.stub();
  			const resizer = createResizer();
  
  			const usedHandle = 'bottom-right';
  			const domParts = getWidgetDomParts( editor, widget, usedHandle );
  			const finalPointerPosition = getHandleCenterPoint( domParts.widget, usedHandle ).moveBy( 40, 40 );
  
  			// Start listening on render at the last stage, to exclude rendering caused by moving the mouse.
  			// Commit is triggered by mouse up and that's what interests us.
  			resizer.on( 'commit', () => {
  				editor.editing.view.on( 'render', renderListener );
  			}, { priority: 'highest' } );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  
  			expect( renderListener.callCount ).to.equal( 1 );
  		} );
  
  		it( 'returns proper value when resize host is different from widget wrapper', () => {
  			createResizer( {
  				unit: undefined,
  				getHandleHost( domWidgetElement ) {
  					return domWidgetElement.querySelector( '.sub-div' );
  				}
  			} );
  
  			const usedHandle = 'bottom-right';
  			const pointerDifference = { x: -10, y: -10 };
  			const expectedWidth = '20%';
  
  			const domParts = getWidgetDomParts( editor, widget, usedHandle );
  			const resizeHost = domParts.widget.querySelector( '.sub-div' );
  			const initialPointerPosition = getHandleCenterPoint( resizeHost, usedHandle );
  			const finalPointerPosition = initialPointerPosition.moveBy( pointerDifference.x, pointerDifference.y );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  			expect( commitStub.callCount, 'call count' ).to.be.eql( 1 );
  			expect( commitStub.args[ 0 ][ 0 ], 'width' ).to.equal( expectedWidth );
  			sinon.assert.calledOnce( commitStub );
  		} );
  
  		it( 'doesn\'t break if the widget wrapper was removed from DOM', () => {
  			const resizer = createResizer( {
  				unit: undefined
  			} );
  			const domParts = getWidgetDomParts( editor, widget, 'bottom-right' );
  
  			domParts.resizeWrapper.remove();
  
  			resizer.redraw();
  		} );
  	} );
  
  	describe( 'attachTo()', () => {
  		it( 'works without WidgetToolbarRepository plugin', async () => {
  			const localEditorElement = createEditorElement();
  			const localEditor = await ClassicEditor.create( localEditorElement, {
  				plugins: [
  					WidgetResize, simpleWidgetPlugin
  				]
  			} );
  
  			setModelData( localEditor.model, '[<widget></widget>]' );
  
  			const resizerOptions = {
  				modelElement: localEditor.model.document.getRoot().getChild( 0 ),
  				viewElement: localEditor.editing.view.document.getRoot().getChild( 0 ),
  				editor: localEditor,
  
  				isCentered: () => false,
  				getHandleHost( domWidgetElement ) {
  					return domWidgetElement;
  				},
  				getResizeHost( domWidgetElement ) {
  					return domWidgetElement;
  				},
  
  				onCommit: commitStub
  			};
  
  			localEditor.plugins.get( WidgetResize ).attachTo( resizerOptions );
  			// Nothing should be thrown.
  			// And clean up.
  			localEditorElement.remove();
  			return localEditor.destroy();
  		} );
  	} );
  
  	describe( 'init()', () => {
  		it( 'adds listener to redraw resizer on visible resizer change', async () => {
  			setModelData( editor.model, '<widget></widget><paragraph>[]</paragraph>' );
  			widget = editor.editing.view.document.getRoot().getChild( 0 );
  
  			const resizer = createResizer();
  			const redrawSpy = sinon.spy( resizer, 'redraw' );
  
  			focusEditor( editor );
  
  			editor.model.change( writer => {
  				const widgetModel = editor.model.document.getRoot().getChild( 0 );
  				writer.setSelection( widgetModel, 'on' );
  			} );
  
  			expect( redrawSpy.callCount ).to.equal( 1 );
  		} );
  	} );
  
  	describe( 'cancel()', () => {
  		it( 'restores original view width', () => {
  			const resizer = createResizer();
  
  			const usedHandle = 'bottom-right';
  			const domParts = getWidgetDomParts( editor, widget, usedHandle );
  			const startingPosition = getHandleCenterPoint( domParts.widget, usedHandle ).moveBy( 100, 0 );
  			const domTarget = domParts.resizeHandle;
  
  			resizerMouseSimulator.down( editor, domTarget );
  			resizerMouseSimulator.move( editor, domTarget, {
  				pageX: startingPosition.x,
  				pageY: startingPosition.y
  			} );
  
  			resizer.cancel();
  
  			// Value should be restored to the initial value (#6060).
  			expect( widget.getStyle( 'width' ) ).to.equal( INITIAL_WIDGET_WIDTH );
  		} );
  	} );
  
  	describe( '_getResizerByHandle()', () => {
  		it( 'returns properly in case of invalid handle element', () => {
  			const randomElement = document.createElement( 'span' );
  			const plugin = editor.plugins.get( WidgetResize );
  
  			createResizer();
  
  			expect( plugin._getResizerByHandle( randomElement ) ).to.be.undefined;
  		} );
  	} );
  
  	/**
  	 * @param {Object} options
  	 * @param {String} options.usedHandle Handle that should be used for resize, e.g. 'bottom-right'.
  	 * @param {Object} options.movePointerBy How much should the pointer move during the drag compared to the initial position.
  	 * @param {String} options.expectedWidth
  	 */
  	function generateResizeTest( options ) {
  		return () => {
  			options = options || {};
  
  			const usedHandle = options.usedHandle;
  			const domParts = getWidgetDomParts( editor, widget, usedHandle );
  			const initialPointerPosition = getHandleCenterPoint( domParts.widget, usedHandle );
  			const pointerDifference = options.movePointerBy;
  			const finalPointerPosition = initialPointerPosition.moveBy( pointerDifference.x, pointerDifference.y );
  
  			resizerMouseSimulator.dragTo( editor, domParts.resizeHandle, finalPointerPosition );
  			expect( commitStub.callCount, 'call count' ).to.be.eql( 1 );
  			expect( commitStub.args[ 0 ][ 0 ], 'width' ).to.equal( options.expectedWidth );
  			sinon.assert.calledOnce( commitStub );
  		};
  	}
  
  	function createEditor( element ) {
  		return ClassicEditor
  			.create( element, {
  				plugins: [
  					ArticlePluginSet, WidgetResize, simpleWidgetPlugin
  				]
  			} );
  	}
  
  	function simpleWidgetPlugin( editor ) {
  		editor.model.schema.register( 'widget', {
  			inheritAllFrom: '$block',
  			isObject: true
  		} );
  
  		editor.conversion.for( 'downcast' )
  			.elementToElement( {
  				model: 'widget',
  				view: ( modelItem, viewWriter ) => {
  					const parentDiv = viewWriter.createContainerElement( 'div' );
  					viewWriter.setStyle( 'height', '50px', parentDiv );
  					viewWriter.setStyle( 'width', '25%', parentDiv ); // It evaluates to 100px.
  
  					const subDiv = viewWriter.createContainerElement( 'div' );
  					viewWriter.insert( viewWriter.createPositionAt( subDiv, 'start' ), viewWriter.createText( 'foo' ) );
  					viewWriter.addClass( 'sub-div', subDiv );
  					viewWriter.setStyle( 'height', '20px', subDiv );
  					viewWriter.setStyle( 'width', '50px', subDiv );
  					viewWriter.insert( viewWriter.createPositionAt( parentDiv, 'start' ), subDiv );
  
  					return toWidget( parentDiv, viewWriter, {
  						label: 'element label'
  					} );
  				}
  			} );
  	}
  
  	function createEditorElement() {
  		const element = document.createElement( 'div' );
  		document.body.appendChild( element );
  		return element;
  	}
  
  	function createResizer( resizerOptions ) {
  		const widgetModel = editor.model.document.getRoot().getChild( 0 );
  
  		const defaultOptions = {
  			unit: 'px',
  
  			modelElement: widgetModel,
  			viewElement: widget,
  			editor,
  
  			isCentered: () => false,
  			getHandleHost( domWidgetElement ) {
  				return domWidgetElement;
  			},
  			getResizeHost( domWidgetElement ) {
  				return domWidgetElement;
  			},
  
  			onCommit: commitStub
  		};
  
  		return editor.plugins.get( WidgetResize ).attachTo( Object.assign( defaultOptions, resizerOptions ) );
  	}
  } );
  