/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { localize } from 'vs/nls';
import { isObject, isString, isUndefined, isNumber } from 'vs/base/common/types';
import { IInstantiationService, ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
import { KeybindingsRegistry, KeybindingWeight } from 'vs/platform/keybinding/common/keybindingsRegistry';
import { IEditorIdentifier, IEditorCommandsContext, CloseDirection, IVisibleEditorPane, EditorsOrder, EditorInputCapabilities, isEditorIdentifier, isEditorInputWithOptionsAndGroup, IUntitledTextResourceEditorInput } from 'vs/workbench/common/editor';
import { TextCompareEditorVisibleContext, ActiveEditorGroupEmptyContext, MultipleEditorGroupsContext, ActiveEditorStickyContext, ActiveEditorGroupLockedContext, ActiveEditorCanSplitInGroupContext, TextCompareEditorActiveContext, SideBySideEditorActiveContext } from 'vs/workbench/common/contextkeys';
import { EditorInput } from 'vs/workbench/common/editor/editorInput';
import { EditorGroupColumn, columnToEditorGroup } from 'vs/workbench/services/editor/common/editorGroupColumn';
import { IEditorService, SIDE_GROUP } from 'vs/workbench/services/editor/common/editorService';
import { EditorContextKeys } from 'vs/editor/common/editorContextKeys';
import { TextDiffEditor } from 'vs/workbench/browser/parts/editor/textDiffEditor';
import { KeyMod, KeyCode, KeyChord } from 'vs/base/common/keyCodes';
import { URI, UriComponents } from 'vs/base/common/uri';
import { IQuickInputService } from 'vs/platform/quickinput/common/quickInput';
import { IListService, IOpenEvent } from 'vs/platform/list/browser/listService';
import { List } from 'vs/base/browser/ui/list/listWidget';
import { distinct, coalesce } from 'vs/base/common/arrays';
import { IEditorGroupsService, IEditorGroup, GroupDirection, GroupLocation, GroupsOrder, preferredSideBySideGroupDirection, EditorGroupLayout, isEditorGroup } from 'vs/workbench/services/editor/common/editorGroupsService';
import { ContextKeyExpr } from 'vs/platform/contextkey/common/contextkey';
import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
import { CommandsRegistry, ICommandHandler, ICommandService } from 'vs/platform/commands/common/commands';
import { MenuRegistry, MenuId, registerAction2, Action2 } from 'vs/platform/actions/common/actions';
import { Categories } from 'vs/platform/action/common/actionCommonCategories';
import { ActiveGroupEditorsByMostRecentlyUsedQuickAccess } from 'vs/workbench/browser/parts/editor/editorQuickAccess';
import { IOpenerService, matchesScheme } from 'vs/platform/opener/common/opener';
import { EditorResolution, IEditorOptions, IResourceEditorInput, ITextEditorOptions } from 'vs/platform/editor/common/editor';
import { Schemas } from 'vs/base/common/network';
import { SideBySideEditorInput } from 'vs/workbench/common/editor/sideBySideEditorInput';
import { SideBySideEditor } from 'vs/workbench/browser/parts/editor/sideBySideEditor';
import { IJSONSchema } from 'vs/base/common/jsonSchema';
import { IEditorResolverService } from 'vs/workbench/services/editor/common/editorResolverService';
import { IPathService } from 'vs/workbench/services/path/common/pathService';
import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
import { extname } from 'vs/base/common/resources';
import { DiffEditorInput } from 'vs/workbench/common/editor/diffEditorInput';
import { isDiffEditor } from 'vs/editor/browser/editorBrowser';
import { IUntitledTextEditorService } from 'vs/workbench/services/untitled/common/untitledTextEditorService';
import { getActiveElement } from 'vs/base/browser/dom';

export const CLOSE_SAVED_EDITORS_COMMAND_ID = 'workbench.action.closeUnmodifiedEditors';
export const CLOSE_EDITORS_IN_GROUP_COMMAND_ID = 'workbench.action.closeEditorsInGroup';
export const CLOSE_EDITORS_AND_GROUP_COMMAND_ID = 'workbench.action.closeEditorsAndGroup';
export const CLOSE_EDITORS_TO_THE_RIGHT_COMMAND_ID = 'workbench.action.closeEditorsToTheRight';
export const CLOSE_EDITOR_COMMAND_ID = 'workbench.action.closeActiveEditor';
export const CLOSE_PINNED_EDITOR_COMMAND_ID = 'workbench.action.closeActivePinnedEditor';
export const CLOSE_EDITOR_GROUP_COMMAND_ID = 'workbench.action.closeGroup';
export const CLOSE_OTHER_EDITORS_IN_GROUP_COMMAND_ID = 'workbench.action.closeOtherEditors';

export const MOVE_ACTIVE_EDITOR_COMMAND_ID = 'moveActiveEditor';
export const COPY_ACTIVE_EDITOR_COMMAND_ID = 'copyActiveEditor';
export const LAYOUT_EDITOR_GROUPS_COMMAND_ID = 'layoutEditorGroups';
export const KEEP_EDITOR_COMMAND_ID = 'workbench.action.keepEditor';
export const TOGGLE_KEEP_EDITORS_COMMAND_ID = 'workbench.action.toggleKeepEditors';
export const TOGGLE_LOCK_GROUP_COMMAND_ID = 'workbench.action.toggleEditorGroupLock';
export const LOCK_GROUP_COMMAND_ID = 'workbench.action.lockEditorGroup';
export const UNLOCK_GROUP_COMMAND_ID = 'workbench.action.unlockEditorGroup';
export const SHOW_EDITORS_IN_GROUP = 'workbench.action.showEditorsInGroup';
export const REOPEN_WITH_COMMAND_ID = 'workbench.action.reopenWithEditor';

export const PIN_EDITOR_COMMAND_ID = 'workbench.action.pinEditor';
export const UNPIN_EDITOR_COMMAND_ID = 'workbench.action.unpinEditor';

export const TOGGLE_DIFF_SIDE_BY_SIDE = 'toggle.diff.renderSideBySide';
export const GOTO_NEXT_CHANGE = 'workbench.action.compareEditor.nextChange';
export const GOTO_PREVIOUS_CHANGE = 'workbench.action.compareEditor.previousChange';
export const DIFF_FOCUS_PRIMARY_SIDE = 'workbench.action.compareEditor.focusPrimarySide';
export const DIFF_FOCUS_SECONDARY_SIDE = 'workbench.action.compareEditor.focusSecondarySide';
export const DIFF_FOCUS_OTHER_SIDE = 'workbench.action.compareEditor.focusOtherSide';
export const DIFF_OPEN_SIDE = 'workbench.action.compareEditor.openSide';
export const TOGGLE_DIFF_IGNORE_TRIM_WHITESPACE = 'toggle.diff.ignoreTrimWhitespace';

export const SPLIT_EDITOR = 'workbench.action.splitEditor';
export const SPLIT_EDITOR_UP = 'workbench.action.splitEditorUp';
export const SPLIT_EDITOR_DOWN = 'workbench.action.splitEditorDown';
export const SPLIT_EDITOR_LEFT = 'workbench.action.splitEditorLeft';
export const SPLIT_EDITOR_RIGHT = 'workbench.action.splitEditorRight';

export const SPLIT_EDITOR_IN_GROUP = 'workbench.action.splitEditorInGroup';
export const TOGGLE_SPLIT_EDITOR_IN_GROUP = 'workbench.action.toggleSplitEditorInGroup';
export const JOIN_EDITOR_IN_GROUP = 'workbench.action.joinEditorInGroup';
export const TOGGLE_SPLIT_EDITOR_IN_GROUP_LAYOUT = 'workbench.action.toggleSplitEditorInGroupLayout';

export const FOCUS_FIRST_SIDE_EDITOR = 'workbench.action.focusFirstSideEditor';
export const FOCUS_SECOND_SIDE_EDITOR = 'workbench.action.focusSecondSideEditor';
export const FOCUS_OTHER_SIDE_EDITOR = 'workbench.action.focusOtherSideEditor';

export const FOCUS_LEFT_GROUP_WITHOUT_WRAP_COMMAND_ID = 'workbench.action.focusLeftGroupWithoutWrap';
export const FOCUS_RIGHT_GROUP_WITHOUT_WRAP_COMMAND_ID = 'workbench.action.focusRightGroupWithoutWrap';
export const FOCUS_ABOVE_GROUP_WITHOUT_WRAP_COMMAND_ID = 'workbench.action.focusAboveGroupWithoutWrap';
export const FOCUS_BELOW_GROUP_WITHOUT_WRAP_COMMAND_ID = 'workbench.action.focusBelowGroupWithoutWrap';

export const OPEN_EDITOR_AT_INDEX_COMMAND_ID = 'workbench.action.openEditorAtIndex';

export const API_OPEN_EDITOR_COMMAND_ID = '_workbench.open';
export const API_OPEN_DIFF_EDITOR_COMMAND_ID = '_workbench.diff';
export const API_OPEN_WITH_EDITOR_COMMAND_ID = '_workbench.openWith';

export const EDITOR_CORE_NAVIGATION_COMMANDS = [
	SPLIT_EDITOR,
	CLOSE_EDITOR_COMMAND_ID,
	UNPIN_EDITOR_COMMAND_ID,
	UNLOCK_GROUP_COMMAND_ID
];

export interface ActiveEditorMoveCopyArguments {
	to: 'first' | 'last' | 'left' | 'right' | 'up' | 'down' | 'center' | 'position' | 'previous' | 'next';
	by: 'tab' | 'group';
	value: number;
}

const isActiveEditorMoveCopyArg = function (arg: ActiveEditorMoveCopyArguments): boolean {
	if (!isObject(arg)) {
		return false;
	}

	if (!isString(arg.to)) {
		return false;
	}

	if (!isUndefined(arg.by) && !isString(arg.by)) {
		return false;
	}

	if (!isUndefined(arg.value) && !isNumber(arg.value)) {
		return false;
	}

	return true;
};

function registerActiveEditorMoveCopyCommand(): void {

	const moveCopyJSONSchema: IJSONSchema = {
		'type': 'object',
		'required': ['to'],
		'properties': {
			'to': {
				'type': 'string',
				'enum': ['left', 'right']
			},
			'by': {
				'type': 'string',
				'enum': ['tab', 'group']
			},
			'value': {
				'type': 'number'
			}
		}
	};

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: MOVE_ACTIVE_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: EditorContextKeys.editorTextFocus,
		primary: 0,
		handler: (accessor, args) => moveCopyActiveEditor(true, args, accessor),
		metadata: {
			description: localize('editorCommand.activeEditorMove.description', "Move the active editor by tabs or groups"),
			args: [
				{
					name: localize('editorCommand.activeEditorMove.arg.name', "Active editor move argument"),
					description: localize('editorCommand.activeEditorMove.arg.description', "Argument Properties:\n\t* 'to': String value providing where to move.\n\t* 'by': String value providing the unit for move (by tab or by group).\n\t* 'value': Number value providing how many positions or an absolute position to move."),
					constraint: isActiveEditorMoveCopyArg,
					schema: moveCopyJSONSchema
				}
			]
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: COPY_ACTIVE_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: EditorContextKeys.editorTextFocus,
		primary: 0,
		handler: (accessor, args) => moveCopyActiveEditor(false, args, accessor),
		metadata: {
			description: localize('editorCommand.activeEditorCopy.description', "Copy the active editor by groups"),
			args: [
				{
					name: localize('editorCommand.activeEditorCopy.arg.name', "Active editor copy argument"),
					description: localize('editorCommand.activeEditorCopy.arg.description', "Argument Properties:\n\t* 'to': String value providing where to copy.\n\t* 'value': Number value providing how many positions or an absolute position to copy."),
					constraint: isActiveEditorMoveCopyArg,
					schema: moveCopyJSONSchema
				}
			]
		}
	});

	function moveCopyActiveEditor(isMove: boolean, args: ActiveEditorMoveCopyArguments = Object.create(null), accessor: ServicesAccessor): void {
		args.to = args.to || 'right';
		args.by = args.by || 'tab';
		args.value = typeof args.value === 'number' ? args.value : 1;

		const activeEditorPane = accessor.get(IEditorService).activeEditorPane;
		if (activeEditorPane) {
			switch (args.by) {
				case 'tab':
					if (isMove) {
						return moveActiveTab(args, activeEditorPane);
					}
					break;
				case 'group':
					return moveCopyActiveEditorToGroup(isMove, args, activeEditorPane, accessor);
			}
		}
	}

	function moveActiveTab(args: ActiveEditorMoveCopyArguments, control: IVisibleEditorPane): void {
		const group = control.group;
		let index = group.getIndexOfEditor(control.input);
		switch (args.to) {
			case 'first':
				index = 0;
				break;
			case 'last':
				index = group.count - 1;
				break;
			case 'left':
				index = index - args.value;
				break;
			case 'right':
				index = index + args.value;
				break;
			case 'center':
				index = Math.round(group.count / 2) - 1;
				break;
			case 'position':
				index = args.value - 1;
				break;
		}

		index = index < 0 ? 0 : index >= group.count ? group.count - 1 : index;
		group.moveEditor(control.input, group, { index });
	}

	function moveCopyActiveEditorToGroup(isMove: boolean, args: ActiveEditorMoveCopyArguments, control: IVisibleEditorPane, accessor: ServicesAccessor): void {
		const editorGroupService = accessor.get(IEditorGroupsService);
		const configurationService = accessor.get(IConfigurationService);

		const sourceGroup = control.group;
		let targetGroup: IEditorGroup | undefined;

		switch (args.to) {
			case 'left':
				targetGroup = editorGroupService.findGroup({ direction: GroupDirection.LEFT }, sourceGroup);
				if (!targetGroup) {
					targetGroup = editorGroupService.addGroup(sourceGroup, GroupDirection.LEFT);
				}
				break;
			case 'right':
				targetGroup = editorGroupService.findGroup({ direction: GroupDirection.RIGHT }, sourceGroup);
				if (!targetGroup) {
					targetGroup = editorGroupService.addGroup(sourceGroup, GroupDirection.RIGHT);
				}
				break;
			case 'up':
				targetGroup = editorGroupService.findGroup({ direction: GroupDirection.UP }, sourceGroup);
				if (!targetGroup) {
					targetGroup = editorGroupService.addGroup(sourceGroup, GroupDirection.UP);
				}
				break;
			case 'down':
				targetGroup = editorGroupService.findGroup({ direction: GroupDirection.DOWN }, sourceGroup);
				if (!targetGroup) {
					targetGroup = editorGroupService.addGroup(sourceGroup, GroupDirection.DOWN);
				}
				break;
			case 'first':
				targetGroup = editorGroupService.findGroup({ location: GroupLocation.FIRST }, sourceGroup);
				break;
			case 'last':
				targetGroup = editorGroupService.findGroup({ location: GroupLocation.LAST }, sourceGroup);
				break;
			case 'previous':
				targetGroup = editorGroupService.findGroup({ location: GroupLocation.PREVIOUS }, sourceGroup);
				break;
			case 'next':
				targetGroup = editorGroupService.findGroup({ location: GroupLocation.NEXT }, sourceGroup);
				if (!targetGroup) {
					targetGroup = editorGroupService.addGroup(sourceGroup, preferredSideBySideGroupDirection(configurationService));
				}
				break;
			case 'center':
				targetGroup = editorGroupService.getGroups(GroupsOrder.GRID_APPEARANCE)[(editorGroupService.count / 2) - 1];
				break;
			case 'position':
				targetGroup = editorGroupService.getGroups(GroupsOrder.GRID_APPEARANCE)[args.value - 1];
				break;
		}

		if (targetGroup) {
			if (isMove) {
				sourceGroup.moveEditor(control.input, targetGroup);
			} else if (sourceGroup.id !== targetGroup.id) {
				sourceGroup.copyEditor(control.input, targetGroup);
			}
			targetGroup.focus();
		}
	}
}

function registerEditorGroupsLayoutCommands(): void {

	function applyEditorLayout(accessor: ServicesAccessor, layout: EditorGroupLayout): void {
		if (!layout || typeof layout !== 'object') {
			return;
		}

		const editorGroupService = accessor.get(IEditorGroupsService);
		editorGroupService.applyLayout(layout);
	}

	CommandsRegistry.registerCommand(LAYOUT_EDITOR_GROUPS_COMMAND_ID, (accessor: ServicesAccessor, args: EditorGroupLayout) => {
		applyEditorLayout(accessor, args);
	});

	// API Commands
	CommandsRegistry.registerCommand({
		id: 'vscode.setEditorLayout',
		handler: (accessor: ServicesAccessor, args: EditorGroupLayout) => applyEditorLayout(accessor, args),
		metadata: {
			description: 'Set Editor Layout',
			args: [{
				name: 'args',
				schema: {
					'type': 'object',
					'required': ['groups'],
					'properties': {
						'orientation': {
							'type': 'number',
							'default': 0,
							'enum': [0, 1]
						},
						'groups': {
							'$ref': '#/definitions/editorGroupsSchema',
							'default': [{}, {}]
						}
					}
				}
			}]
		}
	});

	CommandsRegistry.registerCommand({
		id: 'vscode.getEditorLayout',
		handler: (accessor: ServicesAccessor) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			return editorGroupService.getLayout();
		},
		metadata: {
			description: 'Get Editor Layout',
			args: [],
			returns: 'An editor layout object, in the same format as vscode.setEditorLayout'
		}
	});
}

function registerDiffEditorCommands(): void {
	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: GOTO_NEXT_CHANGE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: TextCompareEditorVisibleContext,
		primary: KeyMod.Alt | KeyCode.F5,
		handler: accessor => navigateInDiffEditor(accessor, true)
	});

	MenuRegistry.appendMenuItem(MenuId.CommandPalette, {
		command: {
			id: GOTO_NEXT_CHANGE,
			title: { value: localize('compare.nextChange', "Go to Next Change"), original: 'Go to Next Change' },
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: GOTO_PREVIOUS_CHANGE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: TextCompareEditorVisibleContext,
		primary: KeyMod.Alt | KeyMod.Shift | KeyCode.F5,
		handler: accessor => navigateInDiffEditor(accessor, false)
	});

	MenuRegistry.appendMenuItem(MenuId.CommandPalette, {
		command: {
			id: GOTO_PREVIOUS_CHANGE,
			title: { value: localize('compare.previousChange', "Go to Previous Change"), original: 'Go to Previous Change' },
		}
	});

	function getActiveTextDiffEditor(accessor: ServicesAccessor): TextDiffEditor | undefined {
		const editorService = accessor.get(IEditorService);

		for (const editor of [editorService.activeEditorPane, ...editorService.visibleEditorPanes]) {
			if (editor instanceof TextDiffEditor) {
				return editor;
			}
		}

		return undefined;
	}

	function navigateInDiffEditor(accessor: ServicesAccessor, next: boolean): void {
		const activeTextDiffEditor = getActiveTextDiffEditor(accessor);

		if (activeTextDiffEditor) {
			activeTextDiffEditor.getControl()?.goToDiff(next ? 'next' : 'previous');
		}
	}

	enum FocusTextDiffEditorMode {
		Original,
		Modified,
		Toggle
	}

	function focusInDiffEditor(accessor: ServicesAccessor, mode: FocusTextDiffEditorMode): void {
		const activeTextDiffEditor = getActiveTextDiffEditor(accessor);

		if (activeTextDiffEditor) {
			switch (mode) {
				case FocusTextDiffEditorMode.Original:
					activeTextDiffEditor.getControl()?.getOriginalEditor().focus();
					break;
				case FocusTextDiffEditorMode.Modified:
					activeTextDiffEditor.getControl()?.getModifiedEditor().focus();
					break;
				case FocusTextDiffEditorMode.Toggle:
					if (activeTextDiffEditor.getControl()?.getModifiedEditor().hasWidgetFocus()) {
						return focusInDiffEditor(accessor, FocusTextDiffEditorMode.Original);
					} else {
						return focusInDiffEditor(accessor, FocusTextDiffEditorMode.Modified);
					}
			}
		}
	}

	function toggleDiffSideBySide(accessor: ServicesAccessor): void {
		const configurationService = accessor.get(IConfigurationService);

		const newValue = !configurationService.getValue('diffEditor.renderSideBySide');
		configurationService.updateValue('diffEditor.renderSideBySide', newValue);
	}

	function toggleDiffIgnoreTrimWhitespace(accessor: ServicesAccessor): void {
		const configurationService = accessor.get(IConfigurationService);

		const newValue = !configurationService.getValue('diffEditor.ignoreTrimWhitespace');
		configurationService.updateValue('diffEditor.ignoreTrimWhitespace', newValue);
	}

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: TOGGLE_DIFF_SIDE_BY_SIDE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: accessor => toggleDiffSideBySide(accessor)
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: DIFF_FOCUS_PRIMARY_SIDE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: accessor => focusInDiffEditor(accessor, FocusTextDiffEditorMode.Modified)
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: DIFF_FOCUS_SECONDARY_SIDE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: accessor => focusInDiffEditor(accessor, FocusTextDiffEditorMode.Original)
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: DIFF_FOCUS_OTHER_SIDE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: accessor => focusInDiffEditor(accessor, FocusTextDiffEditorMode.Toggle)
	});

	MenuRegistry.appendMenuItem(MenuId.CommandPalette, {
		command: {
			id: TOGGLE_DIFF_SIDE_BY_SIDE,
			title: {
				value: localize('toggleInlineView', "Toggle Inline View"),
				original: 'Compare: Toggle Inline View'
			},
			category: localize('compare', "Compare")
		},
		when: TextCompareEditorActiveContext
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: TOGGLE_DIFF_IGNORE_TRIM_WHITESPACE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: accessor => toggleDiffIgnoreTrimWhitespace(accessor)
	});
}

function registerOpenEditorAPICommands(): void {

	function mixinContext(context: IOpenEvent<unknown> | undefined, options: ITextEditorOptions | undefined, column: EditorGroupColumn | undefined): [ITextEditorOptions | undefined, EditorGroupColumn | undefined] {
		if (!context) {
			return [options, column];
		}

		return [
			{ ...context.editorOptions, ...(options ?? Object.create(null)) },
			context.sideBySide ? SIDE_GROUP : column
		];
	}

	// partial, renderer-side API command to open editor
	// complements https://github.com/microsoft/vscode/blob/2b164efb0e6a5de3826bff62683eaeafe032284f/src/vs/workbench/api/common/extHostApiCommands.ts#L373
	CommandsRegistry.registerCommand({
		id: 'vscode.open',
		handler: (accessor, arg) => {
			accessor.get(ICommandService).executeCommand(API_OPEN_EDITOR_COMMAND_ID, arg);
		},
		metadata: {
			description: 'Opens the provided resource in the editor.',
			args: [{ name: 'Uri' }]
		}
	});

	CommandsRegistry.registerCommand(API_OPEN_EDITOR_COMMAND_ID, async function (accessor: ServicesAccessor, resourceArg: UriComponents | string, columnAndOptions?: [EditorGroupColumn?, ITextEditorOptions?], label?: string, context?: IOpenEvent<unknown>) {
		const editorService = accessor.get(IEditorService);
		const editorGroupService = accessor.get(IEditorGroupsService);
		const openerService = accessor.get(IOpenerService);
		const pathService = accessor.get(IPathService);
		const configurationService = accessor.get(IConfigurationService);
		const untitledTextEditorService = accessor.get(IUntitledTextEditorService);

		const resourceOrString = typeof resourceArg === 'string' ? resourceArg : URI.from(resourceArg, true);
		const [columnArg, optionsArg] = columnAndOptions ?? [];

		// use editor options or editor view column or resource scheme
		// as a hint to use the editor service for opening directly
		if (optionsArg || typeof columnArg === 'number' || matchesScheme(resourceOrString, Schemas.untitled)) {
			const [options, column] = mixinContext(context, optionsArg, columnArg);
			const resource = URI.isUri(resourceOrString) ? resourceOrString : URI.parse(resourceOrString);

			let input: IResourceEditorInput | IUntitledTextResourceEditorInput;
			if (untitledTextEditorService.isUntitledWithAssociatedResource(resource)) {
				// special case for untitled: we are getting a resource with meaningful
				// path from an extension to use for the untitled editor. as such, we
				// have to assume it as an associated resource to use when saving. we
				// do so by setting the `forceUntitled: true` and changing the scheme
				// to a file based one. the untitled editor service takes care to
				// associate the path properly then.
				input = { resource: resource.with({ scheme: pathService.defaultUriScheme }), forceUntitled: true, options, label };
			} else {
				// use any other resource as is
				input = { resource, options, label };
			}

			await editorService.openEditor(input, columnToEditorGroup(editorGroupService, configurationService, column));
		}

		// do not allow to execute commands from here
		else if (matchesScheme(resourceOrString, Schemas.command)) {
			return;
		}

		// finally, delegate to opener service
		else {
			await openerService.open(resourceOrString, { openToSide: context?.sideBySide, editorOptions: context?.editorOptions });
		}
	});

	// partial, renderer-side API command to open diff editor
	// complements https://github.com/microsoft/vscode/blob/2b164efb0e6a5de3826bff62683eaeafe032284f/src/vs/workbench/api/common/extHostApiCommands.ts#L397
	CommandsRegistry.registerCommand({
		id: 'vscode.diff',
		handler: (accessor, left, right, label) => {
			accessor.get(ICommandService).executeCommand(API_OPEN_DIFF_EDITOR_COMMAND_ID, left, right, label);
		},
		metadata: {
			description: 'Opens the provided resources in the diff editor to compare their contents.',
			args: [
				{ name: 'left', description: 'Left-hand side resource of the diff editor' },
				{ name: 'right', description: 'Right-hand side resource of the diff editor' },
				{ name: 'title', description: 'Human readable title for the diff editor' },
			]
		}
	});

	CommandsRegistry.registerCommand(API_OPEN_DIFF_EDITOR_COMMAND_ID, async function (accessor: ServicesAccessor, originalResource: UriComponents, modifiedResource: UriComponents, labelAndOrDescription?: string | { label: string; description: string }, columnAndOptions?: [EditorGroupColumn?, ITextEditorOptions?], context?: IOpenEvent<unknown>) {
		const editorService = accessor.get(IEditorService);
		const editorGroupService = accessor.get(IEditorGroupsService);
		const configurationService = accessor.get(IConfigurationService);

		const [columnArg, optionsArg] = columnAndOptions ?? [];
		const [options, column] = mixinContext(context, optionsArg, columnArg);

		let label: string | undefined = undefined;
		let description: string | undefined = undefined;
		if (typeof labelAndOrDescription === 'string') {
			label = labelAndOrDescription;
		} else if (labelAndOrDescription) {
			label = labelAndOrDescription.label;
			description = labelAndOrDescription.description;
		}

		await editorService.openEditor({
			original: { resource: URI.from(originalResource, true) },
			modified: { resource: URI.from(modifiedResource, true) },
			label,
			description,
			options
		}, columnToEditorGroup(editorGroupService, configurationService, column));
	});

	CommandsRegistry.registerCommand(API_OPEN_WITH_EDITOR_COMMAND_ID, async (accessor: ServicesAccessor, resource: UriComponents, id: string, columnAndOptions?: [EditorGroupColumn?, ITextEditorOptions?]) => {
		const editorService = accessor.get(IEditorService);
		const editorGroupsService = accessor.get(IEditorGroupsService);
		const configurationService = accessor.get(IConfigurationService);

		const [columnArg, optionsArg] = columnAndOptions ?? [];

		await editorService.openEditor({ resource: URI.from(resource, true), options: { ...optionsArg, pinned: true, override: id } }, columnToEditorGroup(editorGroupsService, configurationService, columnArg));
	});
}

function registerOpenEditorAtIndexCommands(): void {
	const openEditorAtIndex: ICommandHandler = (accessor: ServicesAccessor, editorIndex: number): void => {
		const editorService = accessor.get(IEditorService);
		const activeEditorPane = editorService.activeEditorPane;
		if (activeEditorPane) {
			const editor = activeEditorPane.group.getEditorByIndex(editorIndex);
			if (editor) {
				editorService.openEditor(editor);
			}
		}
	};

	// This command takes in the editor index number to open as an argument
	CommandsRegistry.registerCommand({
		id: OPEN_EDITOR_AT_INDEX_COMMAND_ID,
		handler: openEditorAtIndex
	});

	// Keybindings to focus a specific index in the tab folder if tabs are enabled
	for (let i = 0; i < 9; i++) {
		const editorIndex = i;
		const visibleIndex = i + 1;

		KeybindingsRegistry.registerCommandAndKeybindingRule({
			id: OPEN_EDITOR_AT_INDEX_COMMAND_ID + visibleIndex,
			weight: KeybindingWeight.WorkbenchContrib,
			when: undefined,
			primary: KeyMod.Alt | toKeyCode(visibleIndex),
			mac: { primary: KeyMod.WinCtrl | toKeyCode(visibleIndex) },
			handler: accessor => openEditorAtIndex(accessor, editorIndex)
		});
	}

	function toKeyCode(index: number): KeyCode {
		switch (index) {
			case 0: return KeyCode.Digit0;
			case 1: return KeyCode.Digit1;
			case 2: return KeyCode.Digit2;
			case 3: return KeyCode.Digit3;
			case 4: return KeyCode.Digit4;
			case 5: return KeyCode.Digit5;
			case 6: return KeyCode.Digit6;
			case 7: return KeyCode.Digit7;
			case 8: return KeyCode.Digit8;
			case 9: return KeyCode.Digit9;
		}

		throw new Error('invalid index');
	}
}

function registerFocusEditorGroupAtIndexCommands(): void {

	// Keybindings to focus a specific group (2-8) in the editor area
	for (let groupIndex = 1; groupIndex < 8; groupIndex++) {
		KeybindingsRegistry.registerCommandAndKeybindingRule({
			id: toCommandId(groupIndex),
			weight: KeybindingWeight.WorkbenchContrib,
			when: undefined,
			primary: KeyMod.CtrlCmd | toKeyCode(groupIndex),
			handler: accessor => {
				const editorGroupService = accessor.get(IEditorGroupsService);
				const configurationService = accessor.get(IConfigurationService);

				// To keep backwards compatibility (pre-grid), allow to focus a group
				// that does not exist as long as it is the next group after the last
				// opened group. Otherwise we return.
				if (groupIndex > editorGroupService.count) {
					return;
				}

				// Group exists: just focus
				const groups = editorGroupService.getGroups(GroupsOrder.GRID_APPEARANCE);
				if (groups[groupIndex]) {
					return groups[groupIndex].focus();
				}

				// Group does not exist: create new by splitting the active one of the last group
				const direction = preferredSideBySideGroupDirection(configurationService);
				const lastGroup = editorGroupService.findGroup({ location: GroupLocation.LAST });
				if (!lastGroup) {
					return;
				}

				const newGroup = editorGroupService.addGroup(lastGroup, direction);

				// Focus
				newGroup.focus();
			}
		});
	}

	function toCommandId(index: number): string {
		switch (index) {
			case 1: return 'workbench.action.focusSecondEditorGroup';
			case 2: return 'workbench.action.focusThirdEditorGroup';
			case 3: return 'workbench.action.focusFourthEditorGroup';
			case 4: return 'workbench.action.focusFifthEditorGroup';
			case 5: return 'workbench.action.focusSixthEditorGroup';
			case 6: return 'workbench.action.focusSeventhEditorGroup';
			case 7: return 'workbench.action.focusEighthEditorGroup';
		}

		throw new Error('Invalid index');
	}

	function toKeyCode(index: number): KeyCode {
		switch (index) {
			case 1: return KeyCode.Digit2;
			case 2: return KeyCode.Digit3;
			case 3: return KeyCode.Digit4;
			case 4: return KeyCode.Digit5;
			case 5: return KeyCode.Digit6;
			case 6: return KeyCode.Digit7;
			case 7: return KeyCode.Digit8;
		}

		throw new Error('Invalid index');
	}
}

export function splitEditor(editorGroupService: IEditorGroupsService, direction: GroupDirection, context?: IEditorCommandsContext): void {
	let sourceGroup: IEditorGroup | undefined;
	if (context && typeof context.groupId === 'number') {
		sourceGroup = editorGroupService.getGroup(context.groupId);
	} else {
		sourceGroup = editorGroupService.activeGroup;
	}

	if (!sourceGroup) {
		return;
	}

	// Add group
	const newGroup = editorGroupService.addGroup(sourceGroup, direction);

	// Split editor (if it can be split)
	let editorToCopy: EditorInput | undefined;
	if (context && typeof context.editorIndex === 'number') {
		editorToCopy = sourceGroup.getEditorByIndex(context.editorIndex);
	} else {
		editorToCopy = sourceGroup.activeEditor ?? undefined;
	}

	// Copy the editor to the new group, else create an empty group
	if (editorToCopy && !editorToCopy.hasCapability(EditorInputCapabilities.Singleton)) {
		sourceGroup.copyEditor(editorToCopy, newGroup, { preserveFocus: context?.preserveFocus });
	}

	// Focus
	newGroup.focus();
}

function registerSplitEditorCommands() {
	[
		{ id: SPLIT_EDITOR_UP, direction: GroupDirection.UP },
		{ id: SPLIT_EDITOR_DOWN, direction: GroupDirection.DOWN },
		{ id: SPLIT_EDITOR_LEFT, direction: GroupDirection.LEFT },
		{ id: SPLIT_EDITOR_RIGHT, direction: GroupDirection.RIGHT }
	].forEach(({ id, direction }) => {
		CommandsRegistry.registerCommand(id, function (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) {
			splitEditor(accessor.get(IEditorGroupsService), direction, getCommandsContext(resourceOrContext, context));
		});
	});
}

function registerCloseEditorCommands() {

	// A special handler for "Close Editor" depending on context
	// - keybindining: do not close sticky editors, rather open the next non-sticky editor
	// - menu: always close editor, even sticky ones
	function closeEditorHandler(accessor: ServicesAccessor, forceCloseStickyEditors: boolean, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<unknown> {
		const editorGroupsService = accessor.get(IEditorGroupsService);
		const editorService = accessor.get(IEditorService);

		let keepStickyEditors: boolean | undefined = undefined;
		if (forceCloseStickyEditors) {
			keepStickyEditors = false; // explicitly close sticky editors
		} else if (resourceOrContext || context) {
			keepStickyEditors = false; // we have a context, as such this command was used e.g. from the tab context menu
		} else {
			keepStickyEditors = editorGroupsService.partOptions.preventPinnedEditorClose === 'keyboard' || editorGroupsService.partOptions.preventPinnedEditorClose === 'keyboardAndMouse'; // respect setting otherwise
		}

		// Skip over sticky editor and select next if we are configured to do so
		if (keepStickyEditors) {
			const activeGroup = editorGroupsService.activeGroup;
			const activeEditor = activeGroup.activeEditor;

			if (activeEditor && activeGroup.isSticky(activeEditor)) {

				// Open next recently active in same group
				const nextNonStickyEditorInGroup = activeGroup.getEditors(EditorsOrder.MOST_RECENTLY_ACTIVE, { excludeSticky: true })[0];
				if (nextNonStickyEditorInGroup) {
					return activeGroup.openEditor(nextNonStickyEditorInGroup);
				}

				// Open next recently active across all groups
				const nextNonStickyEditorInAllGroups = editorService.getEditors(EditorsOrder.MOST_RECENTLY_ACTIVE, { excludeSticky: true })[0];
				if (nextNonStickyEditorInAllGroups) {
					return Promise.resolve(editorGroupsService.getGroup(nextNonStickyEditorInAllGroups.groupId)?.openEditor(nextNonStickyEditorInAllGroups.editor));
				}
			}
		}

		// With context: proceed to close editors as instructed
		const { editors, groups } = getEditorsContext(accessor, resourceOrContext, context);

		return Promise.all(groups.map(async group => {
			if (group) {
				const editorsToClose = coalesce(editors
					.filter(editor => editor.groupId === group.id)
					.map(editor => typeof editor.editorIndex === 'number' ? group.getEditorByIndex(editor.editorIndex) : group.activeEditor))
					.filter(editor => !keepStickyEditors || !group.isSticky(editor));

				await group.closeEditors(editorsToClose, { preserveFocus: context?.preserveFocus });
			}
		}));
	}

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: KeyMod.CtrlCmd | KeyCode.KeyW,
		win: { primary: KeyMod.CtrlCmd | KeyCode.F4, secondary: [KeyMod.CtrlCmd | KeyCode.KeyW] },
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			return closeEditorHandler(accessor, false, resourceOrContext, context);
		}
	});

	CommandsRegistry.registerCommand(CLOSE_PINNED_EDITOR_COMMAND_ID, (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
		return closeEditorHandler(accessor, true /* force close pinned editors */, resourceOrContext, context);
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_EDITORS_IN_GROUP_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyCode.KeyW),
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			return Promise.all(getEditorsContext(accessor, resourceOrContext, context).groups.map(async group => {
				if (group) {
					await group.closeAllEditors({ excludeSticky: true });
					return;
				}
			}));
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_EDITOR_GROUP_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: ContextKeyExpr.and(ActiveEditorGroupEmptyContext, MultipleEditorGroupsContext),
		primary: KeyMod.CtrlCmd | KeyCode.KeyW,
		win: { primary: KeyMod.CtrlCmd | KeyCode.F4, secondary: [KeyMod.CtrlCmd | KeyCode.KeyW] },
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);
			const commandsContext = getCommandsContext(resourceOrContext, context);

			let group: IEditorGroup | undefined;
			if (commandsContext && typeof commandsContext.groupId === 'number') {
				group = editorGroupService.getGroup(commandsContext.groupId);
			} else {
				group = editorGroupService.activeGroup;
			}

			if (group) {
				editorGroupService.removeGroup(group);
			}
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_SAVED_EDITORS_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyCode.KeyU),
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			return Promise.all(getEditorsContext(accessor, resourceOrContext, context).groups.map(async group => {
				if (group) {
					await group.closeEditors({ savedOnly: true, excludeSticky: true }, { preserveFocus: context?.preserveFocus });
				}
			}));
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_OTHER_EDITORS_IN_GROUP_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		mac: { primary: KeyMod.CtrlCmd | KeyMod.Alt | KeyCode.KeyT },
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const { editors, groups } = getEditorsContext(accessor, resourceOrContext, context);
			return Promise.all(groups.map(async group => {
				if (group) {
					const editorsToKeep = editors
						.filter(editor => editor.groupId === group.id)
						.map(editor => typeof editor.editorIndex === 'number' ? group.getEditorByIndex(editor.editorIndex) : group.activeEditor);

					const editorsToClose = group.getEditors(EditorsOrder.SEQUENTIAL, { excludeSticky: true }).filter(editor => !editorsToKeep.includes(editor));

					for (const editorToKeep of editorsToKeep) {
						if (editorToKeep) {
							group.pinEditor(editorToKeep);
						}
					}

					await group.closeEditors(editorsToClose, { preserveFocus: context?.preserveFocus });
				}
			}));
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: CLOSE_EDITORS_TO_THE_RIGHT_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: async (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
			if (group && editor) {
				if (group.activeEditor) {
					group.pinEditor(group.activeEditor);
				}

				await group.closeEditors({ direction: CloseDirection.RIGHT, except: editor, excludeSticky: true }, { preserveFocus: context?.preserveFocus });
			}
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: REOPEN_WITH_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: async (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);
			const editorService = accessor.get(IEditorService);
			const editorResolverService = accessor.get(IEditorResolverService);
			const telemetryService = accessor.get(ITelemetryService);

			const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));

			if (!editor) {
				return;
			}
			const untypedEditor = editor.toUntyped();

			// Resolver can only resolve untyped editors
			if (!untypedEditor) {
				return;
			}
			untypedEditor.options = { ...editorService.activeEditorPane?.options, override: EditorResolution.PICK };
			const resolvedEditor = await editorResolverService.resolveEditor(untypedEditor, group);
			if (!isEditorInputWithOptionsAndGroup(resolvedEditor)) {
				return;
			}

			// Replace editor with resolved one
			await resolvedEditor.group.replaceEditors([
				{
					editor: editor,
					replacement: resolvedEditor.editor,
					forceReplaceDirty: editor.resource?.scheme === Schemas.untitled,
					options: resolvedEditor.options
				}
			]);

			type WorkbenchEditorReopenClassification = {
				owner: 'rebornix';
				comment: 'Identify how a document is reopened';
				scheme: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'File system provider scheme for the resource' };
				ext: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'File extension for the resource' };
				from: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The editor view type the resource is switched from' };
				to: { classification: 'SystemMetaData'; purpose: 'FeatureInsight'; comment: 'The editor view type the resource is switched to' };
			};

			type WorkbenchEditorReopenEvent = {
				scheme: string;
				ext: string;
				from: string;
				to: string;
			};

			telemetryService.publicLog2<WorkbenchEditorReopenEvent, WorkbenchEditorReopenClassification>('workbenchEditorReopen', {
				scheme: editor.resource?.scheme ?? '',
				ext: editor.resource ? extname(editor.resource) : '',
				from: editor.editorId ?? '',
				to: resolvedEditor.editor.editorId ?? ''
			});

			// Make sure it becomes active too
			await resolvedEditor.group.openEditor(resolvedEditor.editor);
		}
	});

	CommandsRegistry.registerCommand(CLOSE_EDITORS_AND_GROUP_COMMAND_ID, async (accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
		const editorGroupService = accessor.get(IEditorGroupsService);

		const { group } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
		if (group) {
			await group.closeAllEditors();

			if (group.count === 0 && editorGroupService.getGroup(group.id) /* could be gone by now */) {
				editorGroupService.removeGroup(group); // only remove group if it is now empty
			}
		}
	});
}

function registerFocusEditorGroupWihoutWrapCommands(): void {

	const commands = [
		{
			id: FOCUS_LEFT_GROUP_WITHOUT_WRAP_COMMAND_ID,
			direction: GroupDirection.LEFT
		},
		{
			id: FOCUS_RIGHT_GROUP_WITHOUT_WRAP_COMMAND_ID,
			direction: GroupDirection.RIGHT
		},
		{
			id: FOCUS_ABOVE_GROUP_WITHOUT_WRAP_COMMAND_ID,
			direction: GroupDirection.UP,
		},
		{
			id: FOCUS_BELOW_GROUP_WITHOUT_WRAP_COMMAND_ID,
			direction: GroupDirection.DOWN
		}
	];

	for (const command of commands) {
		CommandsRegistry.registerCommand(command.id, async (accessor: ServicesAccessor) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const group = editorGroupService.findGroup({ direction: command.direction }, editorGroupService.activeGroup, false);
			group?.focus();
		});
	}
}

function registerSplitEditorInGroupCommands(): void {

	async function splitEditorInGroup(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
		const editorGroupService = accessor.get(IEditorGroupsService);
		const instantiationService = accessor.get(IInstantiationService);

		const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
		if (!editor) {
			return;
		}

		await group.replaceEditors([{
			editor,
			replacement: instantiationService.createInstance(SideBySideEditorInput, undefined, undefined, editor, editor),
			forceReplaceDirty: true
		}]);
	}

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: SPLIT_EDITOR_IN_GROUP,
				title: { value: localize('splitEditorInGroup', "Split Editor in Group"), original: 'Split Editor in Group' },
				category: Categories.View,
				precondition: ActiveEditorCanSplitInGroupContext,
				f1: true,
				keybinding: {
					weight: KeybindingWeight.WorkbenchContrib,
					when: ActiveEditorCanSplitInGroupContext,
					primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.Backslash)
				}
			});
		}
		run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			return splitEditorInGroup(accessor, resourceOrContext, context);
		}
	});

	async function joinEditorInGroup(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
		const editorGroupService = accessor.get(IEditorGroupsService);

		const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
		if (!(editor instanceof SideBySideEditorInput)) {
			return;
		}

		let options: IEditorOptions | undefined = undefined;
		const activeEditorPane = group.activeEditorPane;
		if (activeEditorPane instanceof SideBySideEditor && group.activeEditor === editor) {
			for (const pane of [activeEditorPane.getPrimaryEditorPane(), activeEditorPane.getSecondaryEditorPane()]) {
				if (pane?.hasFocus()) {
					options = { viewState: pane.getViewState() };
					break;
				}
			}
		}

		await group.replaceEditors([{
			editor,
			replacement: editor.primary,
			options
		}]);
	}

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: JOIN_EDITOR_IN_GROUP,
				title: { value: localize('joinEditorInGroup', "Join Editor in Group"), original: 'Join Editor in Group' },
				category: Categories.View,
				precondition: SideBySideEditorActiveContext,
				f1: true,
				keybinding: {
					weight: KeybindingWeight.WorkbenchContrib,
					when: SideBySideEditorActiveContext,
					primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.Backslash)
				}
			});
		}
		run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			return joinEditorInGroup(accessor, resourceOrContext, context);
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: TOGGLE_SPLIT_EDITOR_IN_GROUP,
				title: { value: localize('toggleJoinEditorInGroup', "Toggle Split Editor in Group"), original: 'Toggle Split Editor in Group' },
				category: Categories.View,
				precondition: ContextKeyExpr.or(ActiveEditorCanSplitInGroupContext, SideBySideEditorActiveContext),
				f1: true
			});
		}
		async run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const { editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
			if (editor instanceof SideBySideEditorInput) {
				await joinEditorInGroup(accessor, resourceOrContext, context);
			} else if (editor) {
				await splitEditorInGroup(accessor, resourceOrContext, context);
			}
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: TOGGLE_SPLIT_EDITOR_IN_GROUP_LAYOUT,
				title: { value: localize('toggleSplitEditorInGroupLayout', "Toggle Layout of Split Editor in Group"), original: 'Toggle Layout of Split Editor in Group' },
				category: Categories.View,
				precondition: SideBySideEditorActiveContext,
				f1: true
			});
		}
		async run(accessor: ServicesAccessor): Promise<void> {
			const configurationService = accessor.get(IConfigurationService);
			const currentSetting = configurationService.getValue<unknown>(SideBySideEditor.SIDE_BY_SIDE_LAYOUT_SETTING);

			let newSetting: 'vertical' | 'horizontal';
			if (currentSetting !== 'horizontal') {
				newSetting = 'horizontal';
			} else {
				newSetting = 'vertical';
			}

			return configurationService.updateValue(SideBySideEditor.SIDE_BY_SIDE_LAYOUT_SETTING, newSetting);
		}
	});
}

function registerFocusSideEditorsCommands(): void {

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: FOCUS_FIRST_SIDE_EDITOR,
				title: { value: localize('focusLeftSideEditor', "Focus First Side in Active Editor"), original: 'Focus First Side in Active Editor' },
				category: Categories.View,
				precondition: ContextKeyExpr.or(SideBySideEditorActiveContext, TextCompareEditorActiveContext),
				f1: true
			});
		}
		async run(accessor: ServicesAccessor): Promise<void> {
			const editorService = accessor.get(IEditorService);
			const commandService = accessor.get(ICommandService);

			const activeEditorPane = editorService.activeEditorPane;
			if (activeEditorPane instanceof SideBySideEditor) {
				activeEditorPane.getSecondaryEditorPane()?.focus();
			} else if (activeEditorPane instanceof TextDiffEditor) {
				await commandService.executeCommand(DIFF_FOCUS_SECONDARY_SIDE);
			}
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: FOCUS_SECOND_SIDE_EDITOR,
				title: { value: localize('focusRightSideEditor', "Focus Second Side in Active Editor"), original: 'Focus Second Side in Active Editor' },
				category: Categories.View,
				precondition: ContextKeyExpr.or(SideBySideEditorActiveContext, TextCompareEditorActiveContext),
				f1: true
			});
		}
		async run(accessor: ServicesAccessor): Promise<void> {
			const editorService = accessor.get(IEditorService);
			const commandService = accessor.get(ICommandService);

			const activeEditorPane = editorService.activeEditorPane;
			if (activeEditorPane instanceof SideBySideEditor) {
				activeEditorPane.getPrimaryEditorPane()?.focus();
			} else if (activeEditorPane instanceof TextDiffEditor) {
				await commandService.executeCommand(DIFF_FOCUS_PRIMARY_SIDE);
			}
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: FOCUS_OTHER_SIDE_EDITOR,
				title: { value: localize('focusOtherSideEditor', "Focus Other Side in Active Editor"), original: 'Focus Other Side in Active Editor' },
				category: Categories.View,
				precondition: ContextKeyExpr.or(SideBySideEditorActiveContext, TextCompareEditorActiveContext),
				f1: true
			});
		}
		async run(accessor: ServicesAccessor): Promise<void> {
			const editorService = accessor.get(IEditorService);
			const commandService = accessor.get(ICommandService);

			const activeEditorPane = editorService.activeEditorPane;
			if (activeEditorPane instanceof SideBySideEditor) {
				if (activeEditorPane.getPrimaryEditorPane()?.hasFocus()) {
					activeEditorPane.getSecondaryEditorPane()?.focus();
				} else {
					activeEditorPane.getPrimaryEditorPane()?.focus();
				}
			} else if (activeEditorPane instanceof TextDiffEditor) {
				await commandService.executeCommand(DIFF_FOCUS_OTHER_SIDE);
			}
		}
	});
}

function registerOtherEditorCommands(): void {

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: KEEP_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyCode.Enter),
		handler: async (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
			if (group && editor) {
				return group.pinEditor(editor);
			}
		}
	});

	CommandsRegistry.registerCommand({
		id: TOGGLE_KEEP_EDITORS_COMMAND_ID,
		handler: accessor => {
			const configurationService = accessor.get(IConfigurationService);

			const currentSetting = configurationService.getValue('workbench.editor.enablePreview');
			const newSetting = currentSetting === true ? false : true;
			configurationService.updateValue('workbench.editor.enablePreview', newSetting);
		}
	});

	function setEditorGroupLock(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext, locked?: boolean): void {
		const editorGroupService = accessor.get(IEditorGroupsService);

		const { group } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
		group?.lock(locked ?? !group.isLocked);
	}

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: TOGGLE_LOCK_GROUP_COMMAND_ID,
				title: { value: localize('toggleEditorGroupLock', "Toggle Editor Group Lock"), original: 'Toggle Editor Group Lock' },
				category: Categories.View,
				precondition: MultipleEditorGroupsContext,
				f1: true
			});
		}
		async run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			setEditorGroupLock(accessor, resourceOrContext, context);
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: LOCK_GROUP_COMMAND_ID,
				title: { value: localize('lockEditorGroup', "Lock Editor Group"), original: 'Lock Editor Group' },
				category: Categories.View,
				precondition: ContextKeyExpr.and(MultipleEditorGroupsContext, ActiveEditorGroupLockedContext.toNegated()),
				f1: true
			});
		}
		async run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			setEditorGroupLock(accessor, resourceOrContext, context, true);
		}
	});

	registerAction2(class extends Action2 {
		constructor() {
			super({
				id: UNLOCK_GROUP_COMMAND_ID,
				title: { value: localize('unlockEditorGroup', "Unlock Editor Group"), original: 'Unlock Editor Group' },
				precondition: ContextKeyExpr.and(MultipleEditorGroupsContext, ActiveEditorGroupLockedContext),
				category: Categories.View,
				f1: true
			});
		}
		async run(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): Promise<void> {
			setEditorGroupLock(accessor, resourceOrContext, context, false);
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: PIN_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: ActiveEditorStickyContext.toNegated(),
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyMod.Shift | KeyCode.Enter),
		handler: async (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
			if (group && editor) {
				return group.stickEditor(editor);
			}
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: DIFF_OPEN_SIDE,
		weight: KeybindingWeight.WorkbenchContrib,
		when: EditorContextKeys.inDiffEditor,
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyMod.Shift | KeyCode.KeyO),
		handler: async accessor => {
			const editorService = accessor.get(IEditorService);
			const editorGroupService = accessor.get(IEditorGroupsService);

			const activeEditor = editorService.activeEditor;
			const activeTextEditorControl = editorService.activeTextEditorControl;
			if (!isDiffEditor(activeTextEditorControl) || !(activeEditor instanceof DiffEditorInput)) {
				return;
			}

			let editor: EditorInput | undefined;
			const originalEditor = activeTextEditorControl.getOriginalEditor();
			if (originalEditor.hasTextFocus()) {
				editor = activeEditor.original;
			} else {
				editor = activeEditor.modified;
			}

			return editorGroupService.activeGroup.openEditor(editor);
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: UNPIN_EDITOR_COMMAND_ID,
		weight: KeybindingWeight.WorkbenchContrib,
		when: ActiveEditorStickyContext,
		primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KeyK, KeyMod.Shift | KeyCode.Enter),
		handler: async (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);

			const { group, editor } = resolveCommandsContext(editorGroupService, getCommandsContext(resourceOrContext, context));
			if (group && editor) {
				return group.unstickEditor(editor);
			}
		}
	});

	KeybindingsRegistry.registerCommandAndKeybindingRule({
		id: SHOW_EDITORS_IN_GROUP,
		weight: KeybindingWeight.WorkbenchContrib,
		when: undefined,
		primary: undefined,
		handler: (accessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext) => {
			const editorGroupService = accessor.get(IEditorGroupsService);
			const quickInputService = accessor.get(IQuickInputService);

			const commandsContext = getCommandsContext(resourceOrContext, context);
			if (commandsContext && typeof commandsContext.groupId === 'number') {
				const group = editorGroupService.getGroup(commandsContext.groupId);
				if (group) {
					editorGroupService.activateGroup(group); // we need the group to be active
				}
			}

			return quickInputService.quickAccess.show(ActiveGroupEditorsByMostRecentlyUsedQuickAccess.PREFIX);
		}
	});
}

function getEditorsContext(accessor: ServicesAccessor, resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): { editors: IEditorCommandsContext[]; groups: Array<IEditorGroup | undefined> } {
	const editorGroupService = accessor.get(IEditorGroupsService);
	const listService = accessor.get(IListService);

	const editorContext = getMultiSelectedEditorContexts(getCommandsContext(resourceOrContext, context), listService, editorGroupService);

	const activeGroup = editorGroupService.activeGroup;
	if (editorContext.length === 0 && activeGroup.activeEditor) {
		// add the active editor as fallback
		editorContext.push({
			groupId: activeGroup.id,
			editorIndex: activeGroup.getIndexOfEditor(activeGroup.activeEditor)
		});
	}

	return {
		editors: editorContext,
		groups: distinct(editorContext.map(context => context.groupId)).map(groupId => editorGroupService.getGroup(groupId))
	};
}

function getCommandsContext(resourceOrContext?: URI | IEditorCommandsContext, context?: IEditorCommandsContext): IEditorCommandsContext | undefined {
	if (URI.isUri(resourceOrContext)) {
		return context;
	}

	if (resourceOrContext && typeof resourceOrContext.groupId === 'number') {
		return resourceOrContext;
	}

	if (context && typeof context.groupId === 'number') {
		return context;
	}

	return undefined;
}

function resolveCommandsContext(editorGroupService: IEditorGroupsService, context?: IEditorCommandsContext): { group: IEditorGroup; editor?: EditorInput } {

	// Resolve from context
	let group = context && typeof context.groupId === 'number' ? editorGroupService.getGroup(context.groupId) : undefined;
	let editor = group && context && typeof context.editorIndex === 'number' ? group.getEditorByIndex(context.editorIndex) ?? undefined : undefined;

	// Fallback to active group as needed
	if (!group) {
		group = editorGroupService.activeGroup;
	}

	// Fallback to active editor as needed
	if (!editor) {
		editor = group.activeEditor ?? undefined;
	}

	return { group, editor };
}

export function getMultiSelectedEditorContexts(editorContext: IEditorCommandsContext | undefined, listService: IListService, editorGroupService: IEditorGroupsService): IEditorCommandsContext[] {

	// First check for a focused list to return the selected items from
	const list = listService.lastFocusedList;
	if (list instanceof List && list.getHTMLElement() === getActiveElement()) {
		const elementToContext = (element: IEditorIdentifier | IEditorGroup) => {
			if (isEditorGroup(element)) {
				return { groupId: element.id, editorIndex: undefined };
			}

			const group = editorGroupService.getGroup(element.groupId);

			return { groupId: element.groupId, editorIndex: group ? group.getIndexOfEditor(element.editor) : -1 };
		};

		const onlyEditorGroupAndEditor = (e: IEditorIdentifier | IEditorGroup) => isEditorGroup(e) || isEditorIdentifier(e);

		const focusedElements: Array<IEditorIdentifier | IEditorGroup> = list.getFocusedElements().filter(onlyEditorGroupAndEditor);
		const focus = editorContext ? editorContext : focusedElements.length ? focusedElements.map(elementToContext)[0] : undefined; // need to take into account when editor context is { group: group }

		if (focus) {
			const selection: Array<IEditorIdentifier | IEditorGroup> = list.getSelectedElements().filter(onlyEditorGroupAndEditor);

			if (selection.length > 1) {
				return selection.map(elementToContext);
			}

			return [focus];
		}
	}

	// Otherwise go with passed in context
	return !!editorContext ? [editorContext] : [];
}

export function setup(): void {
	registerActiveEditorMoveCopyCommand();
	registerEditorGroupsLayoutCommands();
	registerDiffEditorCommands();
	registerOpenEditorAPICommands();
	registerOpenEditorAtIndexCommands();
	registerCloseEditorCommands();
	registerOtherEditorCommands();
	registerSplitEditorInGroupCommands();
	registerFocusSideEditorsCommands();
	registerFocusEditorGroupAtIndexCommands();
	registerSplitEditorCommands();
	registerFocusEditorGroupWihoutWrapCommands();
}
