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

import { onUnexpectedError } from 'vs/base/common/errors';
import Event, { Emitter } from 'vs/base/common/event';
import { Disposable, IDisposable, dispose } from 'vs/base/common/lifecycle';
import { TPromise } from 'vs/base/common/winjs.base';
import { ServicesAccessor, IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import { ServiceCollection } from 'vs/platform/instantiation/common/serviceCollection';
import { IContextKey, IContextKeyServiceTarget, IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
import { CommonEditorConfiguration } from 'vs/editor/common/config/commonEditorConfig';
import { Cursor, CursorStateChangedEvent } from 'vs/editor/common/controller/cursor';
import { CursorColumns, ICursors, CursorConfiguration } from 'vs/editor/common/controller/cursorCommon';
import { Position, IPosition } from 'vs/editor/common/core/position';
import { Range, IRange } from 'vs/editor/common/core/range';
import { Selection, ISelection } from 'vs/editor/common/core/selection';
import * as editorCommon from 'vs/editor/common/editorCommon';
import { ViewModel } from 'vs/editor/common/viewModel/viewModelImpl';
import { hash } from 'vs/base/common/hash';
import { EditorModeContext } from 'vs/editor/common/modes/editorModeContext';
import {
	IModelContentChangedEvent, IModelDecorationsChangedEvent,
	IModelLanguageChangedEvent, IModelOptionsChangedEvent, TextModelEventType, IModelLanguageConfigurationChangedEvent
} from 'vs/editor/common/model/textModelEvents';
import * as editorOptions from 'vs/editor/common/config/editorOptions';
import { ICursorPositionChangedEvent, ICursorSelectionChangedEvent } from 'vs/editor/common/controller/cursorEvents';
import { EditorContextKeys } from 'vs/editor/common/editorContextKeys';
import { CommonEditorRegistry } from 'vs/editor/common/editorCommonExtensions';
import { VerticalRevealType } from 'vs/editor/common/view/viewEvents';

let EDITOR_ID = 0;

export abstract class CommonCodeEditor extends Disposable implements editorCommon.ICommonCodeEditor {

	private readonly _onDidDispose: Emitter<void> = this._register(new Emitter<void>());
	public readonly onDidDispose: Event<void> = this._onDidDispose.event;

	private readonly _onDidChangeModelContent: Emitter<IModelContentChangedEvent> = this._register(new Emitter<IModelContentChangedEvent>());
	public readonly onDidChangeModelContent: Event<IModelContentChangedEvent> = this._onDidChangeModelContent.event;

	private readonly _onDidChangeModelLanguage: Emitter<IModelLanguageChangedEvent> = this._register(new Emitter<IModelLanguageChangedEvent>());
	public readonly onDidChangeModelLanguage: Event<IModelLanguageChangedEvent> = this._onDidChangeModelLanguage.event;

	private readonly _onDidChangeModelLanguageConfiguration: Emitter<IModelLanguageConfigurationChangedEvent> = this._register(new Emitter<IModelLanguageConfigurationChangedEvent>());
	public readonly onDidChangeModelLanguageConfiguration: Event<IModelLanguageConfigurationChangedEvent> = this._onDidChangeModelLanguageConfiguration.event;

	private readonly _onDidChangeModelOptions: Emitter<IModelOptionsChangedEvent> = this._register(new Emitter<IModelOptionsChangedEvent>());
	public readonly onDidChangeModelOptions: Event<IModelOptionsChangedEvent> = this._onDidChangeModelOptions.event;

	private readonly _onDidChangeModelDecorations: Emitter<IModelDecorationsChangedEvent> = this._register(new Emitter<IModelDecorationsChangedEvent>());
	public readonly onDidChangeModelDecorations: Event<IModelDecorationsChangedEvent> = this._onDidChangeModelDecorations.event;

	private readonly _onDidChangeConfiguration: Emitter<editorOptions.IConfigurationChangedEvent> = this._register(new Emitter<editorOptions.IConfigurationChangedEvent>());
	public readonly onDidChangeConfiguration: Event<editorOptions.IConfigurationChangedEvent> = this._onDidChangeConfiguration.event;

	protected readonly _onDidChangeModel: Emitter<editorCommon.IModelChangedEvent> = this._register(new Emitter<editorCommon.IModelChangedEvent>());
	public readonly onDidChangeModel: Event<editorCommon.IModelChangedEvent> = this._onDidChangeModel.event;

	private readonly _onDidChangeCursorPosition: Emitter<ICursorPositionChangedEvent> = this._register(new Emitter<ICursorPositionChangedEvent>());
	public readonly onDidChangeCursorPosition: Event<ICursorPositionChangedEvent> = this._onDidChangeCursorPosition.event;

	private readonly _onDidChangeCursorSelection: Emitter<ICursorSelectionChangedEvent> = this._register(new Emitter<ICursorSelectionChangedEvent>());
	public readonly onDidChangeCursorSelection: Event<ICursorSelectionChangedEvent> = this._onDidChangeCursorSelection.event;

	private readonly _onDidLayoutChange: Emitter<editorOptions.EditorLayoutInfo> = this._register(new Emitter<editorOptions.EditorLayoutInfo>());
	public readonly onDidLayoutChange: Event<editorOptions.EditorLayoutInfo> = this._onDidLayoutChange.event;

	protected readonly _onDidFocusEditorText: Emitter<void> = this._register(new Emitter<void>());
	public readonly onDidFocusEditorText: Event<void> = this._onDidFocusEditorText.event;

	protected readonly _onDidBlurEditorText: Emitter<void> = this._register(new Emitter<void>());
	public readonly onDidBlurEditorText: Event<void> = this._onDidBlurEditorText.event;

	protected readonly _onDidFocusEditor: Emitter<void> = this._register(new Emitter<void>());
	public readonly onDidFocusEditor: Event<void> = this._onDidFocusEditor.event;

	protected readonly _onDidBlurEditor: Emitter<void> = this._register(new Emitter<void>());
	public readonly onDidBlurEditor: Event<void> = this._onDidBlurEditor.event;

	private readonly _onWillType: Emitter<string> = this._register(new Emitter<string>());
	public readonly onWillType = this._onWillType.event;

	private readonly _onDidType: Emitter<string> = this._register(new Emitter<string>());
	public readonly onDidType = this._onDidType.event;

	private readonly _onDidPaste: Emitter<Range> = this._register(new Emitter<Range>());
	public readonly onDidPaste = this._onDidPaste.event;


	protected readonly domElement: IContextKeyServiceTarget;
	protected readonly id: number;
	protected readonly _configuration: CommonEditorConfiguration;

	protected _contributions: { [key: string]: editorCommon.IEditorContribution; };
	protected _actions: { [key: string]: editorCommon.IEditorAction; };

	// --- Members logically associated to a model
	protected model: editorCommon.IModel;
	protected listenersToRemove: IDisposable[];
	protected hasView: boolean;

	protected viewModel: ViewModel;
	protected cursor: Cursor;

	protected readonly _instantiationService: IInstantiationService;
	protected readonly _contextKeyService: IContextKeyService;

	/**
	 * map from "parent" decoration type to live decoration ids.
	 */
	private _decorationTypeKeysToIds: { [decorationTypeKey: string]: string[] };
	private _decorationTypeSubtypes: { [decorationTypeKey: string]: { [subtype: string]: boolean } };


	constructor(
		domElement: IContextKeyServiceTarget,
		options: editorOptions.IEditorOptions,
		instantiationService: IInstantiationService,
		contextKeyService: IContextKeyService
	) {
		super();
		this.domElement = domElement;
		this.id = (++EDITOR_ID);
		this._decorationTypeKeysToIds = {};
		this._decorationTypeSubtypes = {};

		options = options || {};
		this._configuration = this._register(this._createConfiguration(options));
		this._register(this._configuration.onDidChange((e) => {
			this._onDidChangeConfiguration.fire(e);

			if (e.layoutInfo) {
				this._onDidLayoutChange.fire(this._configuration.editor.layoutInfo);
			}
		}));

		this._contextKeyService = this._register(contextKeyService.createScoped(this.domElement));
		this._register(new EditorContextKeysManager(this, this._contextKeyService));
		this._register(new EditorModeContext(this, this._contextKeyService));

		this._instantiationService = instantiationService.createChild(new ServiceCollection([IContextKeyService, this._contextKeyService]));

		this._attachModel(null);

		this._contributions = {};
		this._actions = {};
	}

	protected abstract _createConfiguration(options: editorOptions.IEditorOptions): CommonEditorConfiguration;

	public getId(): string {
		return this.getEditorType() + ':' + this.id;
	}

	public getEditorType(): string {
		return editorCommon.EditorType.ICodeEditor;
	}

	public destroy(): void {
		this.dispose();
	}

	public dispose(): void {
		let keys = Object.keys(this._contributions);
		for (let i = 0, len = keys.length; i < len; i++) {
			let contributionId = keys[i];
			this._contributions[contributionId].dispose();
		}
		this._contributions = {};

		// editor actions don't need to be disposed
		this._actions = {};
		this._removeDecorationTypes();
		this._postDetachModelCleanup(this._detachModel());

		this._onDidDispose.fire();

		super.dispose();
	}

	public invokeWithinContext<T>(fn: (accessor: ServicesAccessor) => T): T {
		return this._instantiationService.invokeFunction(fn);
	}

	public updateOptions(newOptions: editorOptions.IEditorOptions): void {
		this._configuration.updateOptions(newOptions);
	}

	public getConfiguration(): editorOptions.InternalEditorOptions {
		return this._configuration.editor;
	}

	public getRawConfiguration(): editorOptions.IEditorOptions {
		return this._configuration.getRawOptions();
	}

	public getValue(options: { preserveBOM: boolean; lineEnding: string; } = null): string {
		if (this.model) {
			let preserveBOM: boolean = (options && options.preserveBOM) ? true : false;
			let eolPreference = editorCommon.EndOfLinePreference.TextDefined;
			if (options && options.lineEnding && options.lineEnding === '\n') {
				eolPreference = editorCommon.EndOfLinePreference.LF;
			} else if (options && options.lineEnding && options.lineEnding === '\r\n') {
				eolPreference = editorCommon.EndOfLinePreference.CRLF;
			}
			return this.model.getValue(eolPreference, preserveBOM);
		}
		return '';
	}

	public setValue(newValue: string): void {
		if (this.model) {
			this.model.setValue(newValue);
		}
	}

	public getModel(): editorCommon.IModel {
		return this.model;
	}

	public setModel(model: editorCommon.IModel = null): void {
		if (this.model === model) {
			// Current model is the new model
			return;
		}

		let detachedModel = this._detachModel();
		this._attachModel(model);

		let e: editorCommon.IModelChangedEvent = {
			oldModelUrl: detachedModel ? detachedModel.uri : null,
			newModelUrl: model ? model.uri : null
		};

		this._removeDecorationTypes();
		this._onDidChangeModel.fire(e);
		this._postDetachModelCleanup(detachedModel);
	}

	private _removeDecorationTypes(): void {
		this._decorationTypeKeysToIds = {};
		if (this._decorationTypeSubtypes) {
			for (let decorationType in this._decorationTypeSubtypes) {
				let subTypes = this._decorationTypeSubtypes[decorationType];
				for (let subType in subTypes) {
					this._removeDecorationType(decorationType + '-' + subType);
				}
			}
			this._decorationTypeSubtypes = {};
		}
	}

	public getCenteredRangeInViewport(): Range {
		if (!this.hasView) {
			return null;
		}
		return this.viewModel.getCenteredRangeInViewport();
	}

	public getVisibleColumnFromPosition(rawPosition: IPosition): number {
		if (!this.model) {
			return rawPosition.column;
		}

		let position = this.model.validatePosition(rawPosition);
		let tabSize = this.model.getOptions().tabSize;

		return CursorColumns.visibleColumnFromColumn(this.model.getLineContent(position.lineNumber), position.column, tabSize) + 1;
	}

	public getPosition(): Position {
		if (!this.cursor) {
			return null;
		}
		return this.cursor.getPosition().clone();
	}

	public setPosition(position: IPosition): void {
		if (!this.cursor) {
			return;
		}
		if (!Position.isIPosition(position)) {
			throw new Error('Invalid arguments');
		}
		this.cursor.setSelections('api', [{
			selectionStartLineNumber: position.lineNumber,
			selectionStartColumn: position.column,
			positionLineNumber: position.lineNumber,
			positionColumn: position.column
		}]);
	}

	private _sendRevealRange(modelRange: Range, verticalType: VerticalRevealType, revealHorizontal: boolean, scrollType: editorCommon.ScrollType): void {
		if (!this.model || !this.cursor) {
			return;
		}
		if (!Range.isIRange(modelRange)) {
			throw new Error('Invalid arguments');
		}
		const validatedModelRange = this.model.validateRange(modelRange);
		const viewRange = this.viewModel.coordinatesConverter.convertModelRangeToViewRange(validatedModelRange);

		this.cursor.emitCursorRevealRange(viewRange, verticalType, revealHorizontal, scrollType);
	}

	public revealLine(lineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLine(lineNumber, VerticalRevealType.Simple, scrollType);
	}

	public revealLineInCenter(lineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLine(lineNumber, VerticalRevealType.Center, scrollType);
	}

	public revealLineInCenterIfOutsideViewport(lineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLine(lineNumber, VerticalRevealType.CenterIfOutsideViewport, scrollType);
	}

	private _revealLine(lineNumber: number, revealType: VerticalRevealType, scrollType: editorCommon.ScrollType): void {
		if (typeof lineNumber !== 'number') {
			throw new Error('Invalid arguments');
		}

		this._sendRevealRange(
			new Range(lineNumber, 1, lineNumber, 1),
			revealType,
			false,
			scrollType
		);
	}

	public revealPosition(position: IPosition, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealPosition(
			position,
			VerticalRevealType.Simple,
			true,
			scrollType
		);
	}

	public revealPositionInCenter(position: IPosition, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealPosition(
			position,
			VerticalRevealType.Center,
			true,
			scrollType
		);
	}

	public revealPositionInCenterIfOutsideViewport(position: IPosition, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealPosition(
			position,
			VerticalRevealType.CenterIfOutsideViewport,
			true,
			scrollType
		);
	}

	private _revealPosition(position: IPosition, verticalType: VerticalRevealType, revealHorizontal: boolean, scrollType: editorCommon.ScrollType): void {
		if (!Position.isIPosition(position)) {
			throw new Error('Invalid arguments');
		}

		this._sendRevealRange(
			new Range(position.lineNumber, position.column, position.lineNumber, position.column),
			verticalType,
			revealHorizontal,
			scrollType
		);
	}

	public getSelection(): Selection {
		if (!this.cursor) {
			return null;
		}
		return this.cursor.getSelection().clone();
	}

	public getSelections(): Selection[] {
		if (!this.cursor) {
			return null;
		}
		let selections = this.cursor.getSelections();
		let result: Selection[] = [];
		for (let i = 0, len = selections.length; i < len; i++) {
			result[i] = selections[i].clone();
		}
		return result;
	}

	public setSelection(range: IRange): void;
	public setSelection(editorRange: Range): void;
	public setSelection(selection: ISelection): void;
	public setSelection(editorSelection: Selection): void;
	public setSelection(something: any): void {
		let isSelection = Selection.isISelection(something);
		let isRange = Range.isIRange(something);

		if (!isSelection && !isRange) {
			throw new Error('Invalid arguments');
		}

		if (isSelection) {
			this._setSelectionImpl(<ISelection>something);
		} else if (isRange) {
			// act as if it was an IRange
			let selection: ISelection = {
				selectionStartLineNumber: something.startLineNumber,
				selectionStartColumn: something.startColumn,
				positionLineNumber: something.endLineNumber,
				positionColumn: something.endColumn
			};
			this._setSelectionImpl(selection);
		}
	}

	private _setSelectionImpl(sel: ISelection): void {
		if (!this.cursor) {
			return;
		}
		let selection = new Selection(sel.selectionStartLineNumber, sel.selectionStartColumn, sel.positionLineNumber, sel.positionColumn);
		this.cursor.setSelections('api', [selection]);
	}

	public revealLines(startLineNumber: number, endLineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLines(
			startLineNumber,
			endLineNumber,
			VerticalRevealType.Simple,
			scrollType
		);
	}

	public revealLinesInCenter(startLineNumber: number, endLineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLines(
			startLineNumber,
			endLineNumber,
			VerticalRevealType.Center,
			scrollType
		);
	}

	public revealLinesInCenterIfOutsideViewport(startLineNumber: number, endLineNumber: number, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealLines(
			startLineNumber,
			endLineNumber,
			VerticalRevealType.CenterIfOutsideViewport,
			scrollType
		);
	}

	private _revealLines(startLineNumber: number, endLineNumber: number, verticalType: VerticalRevealType, scrollType: editorCommon.ScrollType): void {
		if (typeof startLineNumber !== 'number' || typeof endLineNumber !== 'number') {
			throw new Error('Invalid arguments');
		}

		this._sendRevealRange(
			new Range(startLineNumber, 1, endLineNumber, 1),
			verticalType,
			false,
			scrollType
		);
	}

	public revealRange(range: IRange, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth, revealVerticalInCenter: boolean = false, revealHorizontal: boolean = true): void {
		this._revealRange(
			range,
			revealVerticalInCenter ? VerticalRevealType.Center : VerticalRevealType.Simple,
			revealHorizontal,
			scrollType
		);
	}

	public revealRangeInCenter(range: IRange, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealRange(
			range,
			VerticalRevealType.Center,
			true,
			scrollType
		);
	}

	public revealRangeInCenterIfOutsideViewport(range: IRange, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealRange(
			range,
			VerticalRevealType.CenterIfOutsideViewport,
			true,
			scrollType
		);
	}

	public revealRangeAtTop(range: IRange, scrollType: editorCommon.ScrollType = editorCommon.ScrollType.Smooth): void {
		this._revealRange(
			range,
			VerticalRevealType.Top,
			true,
			scrollType
		);
	}

	private _revealRange(range: IRange, verticalType: VerticalRevealType, revealHorizontal: boolean, scrollType: editorCommon.ScrollType): void {
		if (!Range.isIRange(range)) {
			throw new Error('Invalid arguments');
		}

		this._sendRevealRange(
			Range.lift(range),
			verticalType,
			revealHorizontal,
			scrollType
		);
	}

	public setSelections(ranges: ISelection[]): void {
		if (!this.cursor) {
			return;
		}
		if (!ranges || ranges.length === 0) {
			throw new Error('Invalid arguments');
		}
		for (let i = 0, len = ranges.length; i < len; i++) {
			if (!Selection.isISelection(ranges[i])) {
				throw new Error('Invalid arguments');
			}
		}
		this.cursor.setSelections('api', ranges);
	}

	public getScrollWidth(): number {
		if (!this.hasView) {
			return -1;
		}
		return this.viewModel.viewLayout.getScrollWidth();
	}
	public getScrollLeft(): number {
		if (!this.hasView) {
			return -1;
		}
		return this.viewModel.viewLayout.getCurrentScrollLeft();
	}

	public getScrollHeight(): number {
		if (!this.hasView) {
			return -1;
		}
		return this.viewModel.viewLayout.getScrollHeight();
	}
	public getScrollTop(): number {
		if (!this.hasView) {
			return -1;
		}
		return this.viewModel.viewLayout.getCurrentScrollTop();
	}

	public setScrollLeft(newScrollLeft: number): void {
		if (!this.hasView) {
			return;
		}
		if (typeof newScrollLeft !== 'number') {
			throw new Error('Invalid arguments');
		}
		this.viewModel.viewLayout.setScrollPositionNow({
			scrollLeft: newScrollLeft
		});
	}
	public setScrollTop(newScrollTop: number): void {
		if (!this.hasView) {
			return;
		}
		if (typeof newScrollTop !== 'number') {
			throw new Error('Invalid arguments');
		}
		this.viewModel.viewLayout.setScrollPositionNow({
			scrollTop: newScrollTop
		});
	}
	public setScrollPosition(position: editorCommon.INewScrollPosition): void {
		if (!this.hasView) {
			return;
		}
		this.viewModel.viewLayout.setScrollPositionNow(position);
	}

	public saveViewState(): editorCommon.ICodeEditorViewState {
		if (!this.cursor || !this.hasView) {
			return null;
		}
		let contributionsState: { [key: string]: any } = {};

		let keys = Object.keys(this._contributions);
		for (let i = 0, len = keys.length; i < len; i++) {
			let id = keys[i];
			let contribution = this._contributions[id];
			if (typeof contribution.saveViewState === 'function') {
				contributionsState[id] = contribution.saveViewState();
			}
		}

		let cursorState = this.cursor.saveState();
		let viewState = this.viewModel.viewLayout.saveState();
		return {
			cursorState: cursorState,
			viewState: viewState,
			contributionsState: contributionsState
		};
	}

	public restoreViewState(s: editorCommon.ICodeEditorViewState): void {
		if (!this.cursor || !this.hasView) {
			return;
		}
		if (s && s.cursorState && s.viewState) {
			let codeEditorState = <editorCommon.ICodeEditorViewState>s;
			let cursorState = <any>codeEditorState.cursorState;
			if (Array.isArray(cursorState)) {
				this.cursor.restoreState(<editorCommon.ICursorState[]>cursorState);
			} else {
				// Backwards compatibility
				this.cursor.restoreState([<editorCommon.ICursorState>cursorState]);
			}
			this.viewModel.viewLayout.restoreState(codeEditorState.viewState);

			let contributionsState = s.contributionsState || {};
			let keys = Object.keys(this._contributions);
			for (let i = 0, len = keys.length; i < len; i++) {
				let id = keys[i];
				let contribution = this._contributions[id];
				if (typeof contribution.restoreViewState === 'function') {
					contribution.restoreViewState(contributionsState[id]);
				}
			}
		}
	}

	public onVisible(): void {
	}

	public onHide(): void {
	}

	public abstract layout(dimension?: editorCommon.IDimension): void;

	public abstract focus(): void;
	public abstract isFocused(): boolean;
	public abstract hasWidgetFocus(): boolean;

	public getContribution<T extends editorCommon.IEditorContribution>(id: string): T {
		return <T>(this._contributions[id] || null);
	}

	public getActions(): editorCommon.IEditorAction[] {
		let result: editorCommon.IEditorAction[] = [];

		let keys = Object.keys(this._actions);
		for (let i = 0, len = keys.length; i < len; i++) {
			let id = keys[i];
			result.push(this._actions[id]);
		}

		return result;
	}

	public getSupportedActions(): editorCommon.IEditorAction[] {
		let result = this.getActions();

		result = result.filter(action => action.isSupported());

		return result;
	}

	public getAction(id: string): editorCommon.IEditorAction {
		return this._actions[id] || null;
	}

	public trigger(source: string, handlerId: string, payload: any): void {
		payload = payload || {};

		// Special case for typing
		if (handlerId === editorCommon.Handler.Type) {
			if (!this.cursor || typeof payload.text !== 'string' || payload.text.length === 0) {
				// nothing to do
				return;
			}
			if (source === 'keyboard') {
				this._onWillType.fire(payload.text);
			}
			this.cursor.trigger(source, handlerId, payload);
			if (source === 'keyboard') {
				this._onDidType.fire(payload.text);
			}
			return;
		}

		// Special case for pasting
		if (handlerId === editorCommon.Handler.Paste) {
			if (!this.cursor || typeof payload.text !== 'string' || payload.text.length === 0) {
				// nothing to do
				return;
			}
			const startPosition = this.cursor.getSelection().getStartPosition();
			this.cursor.trigger(source, handlerId, payload);
			const endPosition = this.cursor.getSelection().getStartPosition();
			if (source === 'keyboard') {
				this._onDidPaste.fire(
					new Range(startPosition.lineNumber, startPosition.column, endPosition.lineNumber, endPosition.column)
				);
			}
			return;
		}

		const action = this.getAction(handlerId);
		if (action) {
			TPromise.as(action.run()).done(null, onUnexpectedError);
			return;
		}

		if (!this.cursor) {
			return;
		}

		const command = CommonEditorRegistry.getEditorCommand(handlerId);
		if (command) {
			payload = payload || {};
			payload.source = source;
			TPromise.as(command.runEditorCommand(null, this, payload)).done(null, onUnexpectedError);
			return;
		}

		this.cursor.trigger(source, handlerId, payload);
	}

	public _getCursors(): ICursors {
		return this.cursor;
	}

	public _getCursorConfiguration(): CursorConfiguration {
		return this.cursor.context.config;
	}

	public pushUndoStop(): boolean {
		if (!this.model) {
			return false;
		}
		if (this._configuration.editor.readOnly) {
			// read only editor => sorry!
			return false;
		}
		this.model.pushStackElement();
		return true;
	}

	public executeEdits(source: string, edits: editorCommon.IIdentifiedSingleEditOperation[], endCursorState?: Selection[]): boolean {
		if (!this.cursor) {
			// no view, no cursor
			return false;
		}
		if (this._configuration.editor.readOnly) {
			// read only editor => sorry!
			return false;
		}

		this.model.pushEditOperations(this.cursor.getSelections(), edits, () => {
			return endCursorState ? endCursorState : this.cursor.getSelections();
		});

		if (endCursorState) {
			this.cursor.setSelections(source, endCursorState);
		}

		return true;
	}

	public executeCommand(source: string, command: editorCommon.ICommand): void {
		if (!this.cursor) {
			return;
		}
		this.cursor.trigger(source, editorCommon.Handler.ExecuteCommand, command);
	}

	public executeCommands(source: string, commands: editorCommon.ICommand[]): void {
		if (!this.cursor) {
			return;
		}
		this.cursor.trigger(source, editorCommon.Handler.ExecuteCommands, commands);
	}

	public changeDecorations(callback: (changeAccessor: editorCommon.IModelDecorationsChangeAccessor) => any): any {
		if (!this.model) {
			//			console.warn('Cannot change decorations on editor that is not attached to a model');
			// callback will not be called
			return null;
		}
		return this.model.changeDecorations(callback, this.id);
	}

	public getLineDecorations(lineNumber: number): editorCommon.IModelDecoration[] {
		if (!this.model) {
			return null;
		}
		return this.model.getLineDecorations(lineNumber, this.id, this._configuration.editor.readOnly);
	}

	public deltaDecorations(oldDecorations: string[], newDecorations: editorCommon.IModelDeltaDecoration[]): string[] {
		if (!this.model) {
			return [];
		}

		if (oldDecorations.length === 0 && newDecorations.length === 0) {
			return oldDecorations;
		}

		return this.model.deltaDecorations(oldDecorations, newDecorations, this.id);
	}

	public setDecorations(decorationTypeKey: string, decorationOptions: editorCommon.IDecorationOptions[]): void {

		let newDecorationsSubTypes: { [key: string]: boolean } = {};
		let oldDecorationsSubTypes = this._decorationTypeSubtypes[decorationTypeKey] || {};
		this._decorationTypeSubtypes[decorationTypeKey] = newDecorationsSubTypes;

		let newModelDecorations: editorCommon.IModelDeltaDecoration[] = [];

		for (let decorationOption of decorationOptions) {
			let typeKey = decorationTypeKey;
			if (decorationOption.renderOptions) {
				// identify custom reder options by a hash code over all keys and values
				// For custom render options register a decoration type if necessary
				let subType = hash(decorationOption.renderOptions).toString(16);
				// The fact that `decorationTypeKey` appears in the typeKey has no influence
				// it is just a mechanism to get predictable and unique keys (repeatable for the same options and unique across clients)
				typeKey = decorationTypeKey + '-' + subType;
				if (!oldDecorationsSubTypes[subType] && !newDecorationsSubTypes[subType]) {
					// decoration type did not exist before, register new one
					this._registerDecorationType(typeKey, decorationOption.renderOptions, decorationTypeKey);
				}
				newDecorationsSubTypes[subType] = true;
			}
			let opts = this._resolveDecorationOptions(typeKey, !!decorationOption.hoverMessage);
			if (decorationOption.hoverMessage) {
				opts.hoverMessage = decorationOption.hoverMessage;
			}
			newModelDecorations.push({ range: decorationOption.range, options: opts });
		}

		// remove decoration sub types that are no longer used, deregister decoration type if necessary
		for (let subType in oldDecorationsSubTypes) {
			if (!newDecorationsSubTypes[subType]) {
				this._removeDecorationType(decorationTypeKey + '-' + subType);
			}
		}

		// update all decorations
		let oldDecorationsIds = this._decorationTypeKeysToIds[decorationTypeKey] || [];
		this._decorationTypeKeysToIds[decorationTypeKey] = this.deltaDecorations(oldDecorationsIds, newModelDecorations);
	}

	public removeDecorations(decorationTypeKey: string): void {
		// remove decorations for type and sub type
		let oldDecorationsIds = this._decorationTypeKeysToIds[decorationTypeKey];
		if (oldDecorationsIds) {
			this.deltaDecorations(oldDecorationsIds, []);
		}
		if (this._decorationTypeKeysToIds.hasOwnProperty(decorationTypeKey)) {
			delete this._decorationTypeKeysToIds[decorationTypeKey];
		}
		if (this._decorationTypeSubtypes.hasOwnProperty(decorationTypeKey)) {
			delete this._decorationTypeSubtypes[decorationTypeKey];
		}
	}

	public getLayoutInfo(): editorOptions.EditorLayoutInfo {
		return this._configuration.editor.layoutInfo;
	}

	protected _attachModel(model: editorCommon.IModel): void {
		this.model = model ? model : null;
		this.listenersToRemove = [];
		this.viewModel = null;
		this.cursor = null;

		if (this.model) {
			this.domElement.setAttribute('data-mode-id', this.model.getLanguageIdentifier().language);
			this._configuration.setIsDominatedByLongLines(this.model.isDominatedByLongLines());
			this._configuration.setMaxLineNumber(this.model.getLineCount());

			this.model.onBeforeAttached();

			this.viewModel = new ViewModel(this.id, this._configuration, this.model, (callback) => this._scheduleAtNextAnimationFrame(callback));

			this.listenersToRemove.push(this.model.addBulkListener((events) => {
				for (let i = 0, len = events.length; i < len; i++) {
					let eventType = events[i].type;
					let e = events[i].data;

					switch (eventType) {
						case TextModelEventType.ModelDecorationsChanged:
							this._onDidChangeModelDecorations.fire(e);
							break;

						case TextModelEventType.ModelLanguageChanged:
							this.domElement.setAttribute('data-mode-id', this.model.getLanguageIdentifier().language);
							this._onDidChangeModelLanguage.fire(e);
							break;

						case TextModelEventType.ModelLanguageConfigurationChanged:
							this._onDidChangeModelLanguageConfiguration.fire(e);
							break;

						case TextModelEventType.ModelContentChanged:
							this._onDidChangeModelContent.fire(e);
							break;

						case TextModelEventType.ModelOptionsChanged:
							this._onDidChangeModelOptions.fire(e);
							break;

						case TextModelEventType.ModelDispose:
							// Someone might destroy the model from under the editor, so prevent any exceptions by setting a null model
							this.setModel(null);
							break;

						default:
						// console.warn("Unhandled model event: ", e);
					}
				}
			}));

			this.cursor = new Cursor(
				this._configuration,
				this.model,
				this.viewModel
			);

			this._createView();

			this.listenersToRemove.push(this.cursor.onDidChange((e: CursorStateChangedEvent) => {

				let positions: Position[] = [];
				for (let i = 0, len = e.selections.length; i < len; i++) {
					positions[i] = e.selections[i].getPosition();
				}

				const e1: ICursorPositionChangedEvent = {
					position: positions[0],
					secondaryPositions: positions.slice(1),
					reason: e.reason,
					source: e.source
				};
				this._onDidChangeCursorPosition.fire(e1);

				const e2: ICursorSelectionChangedEvent = {
					selection: e.selections[0],
					secondarySelections: e.selections.slice(1),
					source: e.source,
					reason: e.reason
				};
				this._onDidChangeCursorSelection.fire(e2);
			}));

		} else {
			this.hasView = false;
		}
	}

	protected abstract _scheduleAtNextAnimationFrame(callback: () => void): IDisposable;
	protected abstract _createView(): void;

	protected _postDetachModelCleanup(detachedModel: editorCommon.IModel): void {
		if (detachedModel) {
			detachedModel.removeAllDecorationsWithOwnerId(this.id);
		}
	}

	protected _detachModel(): editorCommon.IModel {
		if (this.model) {
			this.model.onBeforeDetached();
		}

		this.hasView = false;

		this.listenersToRemove = dispose(this.listenersToRemove);

		if (this.cursor) {
			this.cursor.dispose();
			this.cursor = null;
		}

		if (this.viewModel) {
			this.viewModel.dispose();
			this.viewModel = null;
		}

		let result = this.model;
		this.model = null;

		this.domElement.removeAttribute('data-mode-id');

		return result;
	}

	protected abstract _registerDecorationType(key: string, options: editorCommon.IDecorationRenderOptions, parentTypeKey?: string): void;
	protected abstract _removeDecorationType(key: string): void;
	protected abstract _resolveDecorationOptions(typeKey: string, writable: boolean): editorCommon.IModelDecorationOptions;

	/* __GDPR__FRAGMENT__
	   "EditorTelemetryData" : {}
	 */
	public getTelemetryData(): { [key: string]: any; } {
		return null;
	}
}

class EditorContextKeysManager extends Disposable {

	private _editor: CommonCodeEditor;

	private _editorId: IContextKey<string>;
	private _editorFocus: IContextKey<boolean>;
	private _editorTextFocus: IContextKey<boolean>;
	private _editorTabMovesFocus: IContextKey<boolean>;
	private _editorReadonly: IContextKey<boolean>;
	private _hasMultipleSelections: IContextKey<boolean>;
	private _hasNonEmptySelection: IContextKey<boolean>;

	constructor(
		editor: CommonCodeEditor,
		contextKeyService: IContextKeyService
	) {
		super();

		this._editor = editor;

		this._editorId = contextKeyService.createKey('editorId', editor.getId());
		this._editorFocus = EditorContextKeys.focus.bindTo(contextKeyService);
		this._editorTextFocus = EditorContextKeys.textFocus.bindTo(contextKeyService);
		this._editorTabMovesFocus = EditorContextKeys.tabMovesFocus.bindTo(contextKeyService);
		this._editorReadonly = EditorContextKeys.readOnly.bindTo(contextKeyService);
		this._hasMultipleSelections = EditorContextKeys.hasMultipleSelections.bindTo(contextKeyService);
		this._hasNonEmptySelection = EditorContextKeys.hasNonEmptySelection.bindTo(contextKeyService);

		this._register(this._editor.onDidChangeConfiguration(() => this._updateFromConfig()));
		this._register(this._editor.onDidChangeCursorSelection(() => this._updateFromSelection()));
		this._register(this._editor.onDidFocusEditor(() => this._updateFromFocus()));
		this._register(this._editor.onDidBlurEditor(() => this._updateFromFocus()));
		this._register(this._editor.onDidFocusEditorText(() => this._updateFromFocus()));
		this._register(this._editor.onDidBlurEditorText(() => this._updateFromFocus()));

		this._updateFromConfig();
		this._updateFromSelection();
		this._updateFromFocus();
	}

	private _updateFromConfig(): void {
		let config = this._editor.getConfiguration();

		this._editorTabMovesFocus.set(config.tabFocusMode);
		this._editorReadonly.set(config.readOnly);
	}

	private _updateFromSelection(): void {
		let selections = this._editor.getSelections();
		if (!selections) {
			this._hasMultipleSelections.reset();
			this._hasNonEmptySelection.reset();
		} else {
			this._hasMultipleSelections.set(selections.length > 1);
			this._hasNonEmptySelection.set(selections.some(s => !s.isEmpty()));
		}
	}

	private _updateFromFocus(): void {
		this._editorFocus.set(this._editor.hasWidgetFocus());
		this._editorTextFocus.set(this._editor.isFocused());
	}
}