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

import * as lsTypes from 'vscode-languageserver-types';
import {
	languages,
	editor,
	IMarkdownString,
	Uri,
	Position,
	IRange,
	Range,
	CancellationToken,
	IDisposable,
	MarkerSeverity,
	IEvent
} from '../fillers/monaco-editor-core';

export interface WorkerAccessor<T> {
	(...more: Uri[]): Promise<T>;
}

//#region DiagnosticsAdapter

export interface ILanguageWorkerWithDiagnostics {
	doValidation(uri: string): Promise<lsTypes.Diagnostic[]>;
}

export class DiagnosticsAdapter<T extends ILanguageWorkerWithDiagnostics> {
	protected readonly _disposables: IDisposable[] = [];
	private readonly _listener: { [uri: string]: IDisposable } = Object.create(null);

	constructor(
		private readonly _languageId: string,
		protected readonly _worker: WorkerAccessor<T>,
		configChangeEvent: IEvent<any>
	) {
		const onModelAdd = (model: editor.IModel): void => {
			let modeId = model.getLanguageId();
			if (modeId !== this._languageId) {
				return;
			}

			let handle: number;
			this._listener[model.uri.toString()] = model.onDidChangeContent(() => {
				window.clearTimeout(handle);
				handle = window.setTimeout(() => this._doValidate(model.uri, modeId), 500);
			});

			this._doValidate(model.uri, modeId);
		};

		const onModelRemoved = (model: editor.IModel): void => {
			editor.setModelMarkers(model, this._languageId, []);

			let uriStr = model.uri.toString();
			let listener = this._listener[uriStr];
			if (listener) {
				listener.dispose();
				delete this._listener[uriStr];
			}
		};

		this._disposables.push(editor.onDidCreateModel(onModelAdd));
		this._disposables.push(editor.onWillDisposeModel(onModelRemoved));
		this._disposables.push(
			editor.onDidChangeModelLanguage((event) => {
				onModelRemoved(event.model);
				onModelAdd(event.model);
			})
		);

		this._disposables.push(
			configChangeEvent((_) => {
				editor.getModels().forEach((model) => {
					if (model.getLanguageId() === this._languageId) {
						onModelRemoved(model);
						onModelAdd(model);
					}
				});
			})
		);

		this._disposables.push({
			dispose: () => {
				editor.getModels().forEach(onModelRemoved);
				for (let key in this._listener) {
					this._listener[key].dispose();
				}
			}
		});

		editor.getModels().forEach(onModelAdd);
	}

	public dispose(): void {
		this._disposables.forEach((d) => d && d.dispose());
		this._disposables.length = 0;
	}

	private _doValidate(resource: Uri, languageId: string): void {
		this._worker(resource)
			.then((worker) => {
				return worker.doValidation(resource.toString());
			})
			.then((diagnostics) => {
				const markers = diagnostics.map((d) => toDiagnostics(resource, d));
				let model = editor.getModel(resource);
				if (model && model.getLanguageId() === languageId) {
					editor.setModelMarkers(model, languageId, markers);
				}
			})
			.then(undefined, (err) => {
				console.error(err);
			});
	}
}

function toSeverity(lsSeverity: number | undefined): MarkerSeverity {
	switch (lsSeverity) {
		case lsTypes.DiagnosticSeverity.Error:
			return MarkerSeverity.Error;
		case lsTypes.DiagnosticSeverity.Warning:
			return MarkerSeverity.Warning;
		case lsTypes.DiagnosticSeverity.Information:
			return MarkerSeverity.Info;
		case lsTypes.DiagnosticSeverity.Hint:
			return MarkerSeverity.Hint;
		default:
			return MarkerSeverity.Info;
	}
}

function toDiagnostics(resource: Uri, diag: lsTypes.Diagnostic): editor.IMarkerData {
	let code = typeof diag.code === 'number' ? String(diag.code) : <string>diag.code;

	return {
		severity: toSeverity(diag.severity),
		startLineNumber: diag.range.start.line + 1,
		startColumn: diag.range.start.character + 1,
		endLineNumber: diag.range.end.line + 1,
		endColumn: diag.range.end.character + 1,
		message: diag.message,
		code: code,
		source: diag.source
	};
}

//#endregion

//#region CompletionAdapter

export interface ILanguageWorkerWithCompletions {
	doComplete(uri: string, position: lsTypes.Position): Promise<lsTypes.CompletionList>;
}

export class CompletionAdapter<T extends ILanguageWorkerWithCompletions>
	implements languages.CompletionItemProvider
{
	constructor(
		private readonly _worker: WorkerAccessor<T>,
		private readonly _triggerCharacters: string[]
	) {}

	public get triggerCharacters(): string[] {
		return this._triggerCharacters;
	}

	provideCompletionItems(
		model: editor.IReadOnlyModel,
		position: Position,
		context: languages.CompletionContext,
		token: CancellationToken
	): Promise<languages.CompletionList | undefined> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => {
				return worker.doComplete(resource.toString(), fromPosition(position));
			})
			.then((info) => {
				if (!info) {
					return;
				}
				const wordInfo = model.getWordUntilPosition(position);
				const wordRange = new Range(
					position.lineNumber,
					wordInfo.startColumn,
					position.lineNumber,
					wordInfo.endColumn
				);

				const items: languages.CompletionItem[] = info.items.map((entry) => {
					const item: languages.CompletionItem = {
						label: entry.label,
						insertText: entry.insertText || entry.label,
						sortText: entry.sortText,
						filterText: entry.filterText,
						documentation: entry.documentation,
						detail: entry.detail,
						command: toCommand(entry.command),
						range: wordRange,
						kind: toCompletionItemKind(entry.kind)
					};
					if (entry.textEdit) {
						if (isInsertReplaceEdit(entry.textEdit)) {
							item.range = {
								insert: toRange(entry.textEdit.insert),
								replace: toRange(entry.textEdit.replace)
							};
						} else {
							item.range = toRange(entry.textEdit.range);
						}
						item.insertText = entry.textEdit.newText;
					}
					if (entry.additionalTextEdits) {
						item.additionalTextEdits =
							entry.additionalTextEdits.map<languages.TextEdit>(toTextEdit);
					}
					if (entry.insertTextFormat === lsTypes.InsertTextFormat.Snippet) {
						item.insertTextRules = languages.CompletionItemInsertTextRule.InsertAsSnippet;
					}
					return item;
				});

				return {
					isIncomplete: info.isIncomplete,
					suggestions: items
				};
			});
	}
}

export function fromPosition(position: Position): lsTypes.Position;
export function fromPosition(position: undefined): undefined;
export function fromPosition(position: Position | undefined): lsTypes.Position | undefined;
export function fromPosition(position: Position | undefined): lsTypes.Position | undefined {
	if (!position) {
		return void 0;
	}
	return { character: position.column - 1, line: position.lineNumber - 1 };
}

export function fromRange(range: IRange): lsTypes.Range;
export function fromRange(range: undefined): undefined;
export function fromRange(range: IRange | undefined): lsTypes.Range | undefined;
export function fromRange(range: IRange | undefined): lsTypes.Range | undefined {
	if (!range) {
		return void 0;
	}
	return {
		start: {
			line: range.startLineNumber - 1,
			character: range.startColumn - 1
		},
		end: { line: range.endLineNumber - 1, character: range.endColumn - 1 }
	};
}
export function toRange(range: lsTypes.Range): Range;
export function toRange(range: undefined): undefined;
export function toRange(range: lsTypes.Range | undefined): Range | undefined;
export function toRange(range: lsTypes.Range | undefined): Range | undefined {
	if (!range) {
		return void 0;
	}
	return new Range(
		range.start.line + 1,
		range.start.character + 1,
		range.end.line + 1,
		range.end.character + 1
	);
}

function isInsertReplaceEdit(
	edit: lsTypes.TextEdit | lsTypes.InsertReplaceEdit
): edit is lsTypes.InsertReplaceEdit {
	return (
		typeof (<lsTypes.InsertReplaceEdit>edit).insert !== 'undefined' &&
		typeof (<lsTypes.InsertReplaceEdit>edit).replace !== 'undefined'
	);
}

function toCompletionItemKind(kind: number | undefined): languages.CompletionItemKind {
	const mItemKind = languages.CompletionItemKind;

	switch (kind) {
		case lsTypes.CompletionItemKind.Text:
			return mItemKind.Text;
		case lsTypes.CompletionItemKind.Method:
			return mItemKind.Method;
		case lsTypes.CompletionItemKind.Function:
			return mItemKind.Function;
		case lsTypes.CompletionItemKind.Constructor:
			return mItemKind.Constructor;
		case lsTypes.CompletionItemKind.Field:
			return mItemKind.Field;
		case lsTypes.CompletionItemKind.Variable:
			return mItemKind.Variable;
		case lsTypes.CompletionItemKind.Class:
			return mItemKind.Class;
		case lsTypes.CompletionItemKind.Interface:
			return mItemKind.Interface;
		case lsTypes.CompletionItemKind.Module:
			return mItemKind.Module;
		case lsTypes.CompletionItemKind.Property:
			return mItemKind.Property;
		case lsTypes.CompletionItemKind.Unit:
			return mItemKind.Unit;
		case lsTypes.CompletionItemKind.Value:
			return mItemKind.Value;
		case lsTypes.CompletionItemKind.Enum:
			return mItemKind.Enum;
		case lsTypes.CompletionItemKind.Keyword:
			return mItemKind.Keyword;
		case lsTypes.CompletionItemKind.Snippet:
			return mItemKind.Snippet;
		case lsTypes.CompletionItemKind.Color:
			return mItemKind.Color;
		case lsTypes.CompletionItemKind.File:
			return mItemKind.File;
		case lsTypes.CompletionItemKind.Reference:
			return mItemKind.Reference;
	}
	return mItemKind.Property;
}

function fromCompletionItemKind(kind: languages.CompletionItemKind): lsTypes.CompletionItemKind {
	const mItemKind = languages.CompletionItemKind;

	switch (kind) {
		case mItemKind.Text:
			return lsTypes.CompletionItemKind.Text;
		case mItemKind.Method:
			return lsTypes.CompletionItemKind.Method;
		case mItemKind.Function:
			return lsTypes.CompletionItemKind.Function;
		case mItemKind.Constructor:
			return lsTypes.CompletionItemKind.Constructor;
		case mItemKind.Field:
			return lsTypes.CompletionItemKind.Field;
		case mItemKind.Variable:
			return lsTypes.CompletionItemKind.Variable;
		case mItemKind.Class:
			return lsTypes.CompletionItemKind.Class;
		case mItemKind.Interface:
			return lsTypes.CompletionItemKind.Interface;
		case mItemKind.Module:
			return lsTypes.CompletionItemKind.Module;
		case mItemKind.Property:
			return lsTypes.CompletionItemKind.Property;
		case mItemKind.Unit:
			return lsTypes.CompletionItemKind.Unit;
		case mItemKind.Value:
			return lsTypes.CompletionItemKind.Value;
		case mItemKind.Enum:
			return lsTypes.CompletionItemKind.Enum;
		case mItemKind.Keyword:
			return lsTypes.CompletionItemKind.Keyword;
		case mItemKind.Snippet:
			return lsTypes.CompletionItemKind.Snippet;
		case mItemKind.Color:
			return lsTypes.CompletionItemKind.Color;
		case mItemKind.File:
			return lsTypes.CompletionItemKind.File;
		case mItemKind.Reference:
			return lsTypes.CompletionItemKind.Reference;
	}
	return lsTypes.CompletionItemKind.Property;
}

export function toTextEdit(textEdit: lsTypes.TextEdit): languages.TextEdit;
export function toTextEdit(textEdit: undefined): undefined;
export function toTextEdit(textEdit: lsTypes.TextEdit | undefined): languages.TextEdit | undefined;
export function toTextEdit(textEdit: lsTypes.TextEdit | undefined): languages.TextEdit | undefined {
	if (!textEdit) {
		return void 0;
	}
	return {
		range: toRange(textEdit.range),
		text: textEdit.newText
	};
}

function toCommand(c: lsTypes.Command | undefined): languages.Command | undefined {
	return c && c.command === 'editor.action.triggerSuggest'
		? { id: c.command, title: c.title, arguments: c.arguments }
		: undefined;
}

//#endregion

//#region HoverAdapter

export interface ILanguageWorkerWithHover {
	doHover(uri: string, position: lsTypes.Position): Promise<lsTypes.Hover | null>;
}

export class HoverAdapter<T extends ILanguageWorkerWithHover> implements languages.HoverProvider {
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	provideHover(
		model: editor.IReadOnlyModel,
		position: Position,
		token: CancellationToken
	): Promise<languages.Hover | undefined> {
		let resource = model.uri;

		return this._worker(resource)
			.then((worker) => {
				return worker.doHover(resource.toString(), fromPosition(position));
			})
			.then((info) => {
				if (!info) {
					return;
				}
				return <languages.Hover>{
					range: toRange(info.range),
					contents: toMarkedStringArray(info.contents)
				};
			});
	}
}

function isMarkupContent(thing: any): thing is lsTypes.MarkupContent {
	return (
		thing && typeof thing === 'object' && typeof (<lsTypes.MarkupContent>thing).kind === 'string'
	);
}

function toMarkdownString(entry: lsTypes.MarkupContent | lsTypes.MarkedString): IMarkdownString {
	if (typeof entry === 'string') {
		return {
			value: entry
		};
	}
	if (isMarkupContent(entry)) {
		if (entry.kind === 'plaintext') {
			return {
				value: entry.value.replace(/[\\`*_{}[\]()#+\-.!]/g, '\\$&')
			};
		}
		return {
			value: entry.value
		};
	}

	return { value: '```' + entry.language + '\n' + entry.value + '\n```\n' };
}

function toMarkedStringArray(
	contents: lsTypes.MarkupContent | lsTypes.MarkedString | lsTypes.MarkedString[]
): IMarkdownString[] | undefined {
	if (!contents) {
		return void 0;
	}
	if (Array.isArray(contents)) {
		return contents.map(toMarkdownString);
	}
	return [toMarkdownString(contents)];
}

//#endregion

//#region DocumentHighlightAdapter

export interface ILanguageWorkerWithDocumentHighlights {
	findDocumentHighlights(
		uri: string,
		position: lsTypes.Position
	): Promise<lsTypes.DocumentHighlight[]>;
}

export class DocumentHighlightAdapter<T extends ILanguageWorkerWithDocumentHighlights>
	implements languages.DocumentHighlightProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	public provideDocumentHighlights(
		model: editor.IReadOnlyModel,
		position: Position,
		token: CancellationToken
	): Promise<languages.DocumentHighlight[]> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => worker.findDocumentHighlights(resource.toString(), fromPosition(position)))
			.then((entries) => {
				if (!entries) {
					return;
				}
				return entries.map((entry) => {
					return <languages.DocumentHighlight>{
						range: toRange(entry.range),
						kind: toDocumentHighlightKind(entry.kind)
					};
				});
			});
	}
}

function toDocumentHighlightKind(
	kind: lsTypes.DocumentHighlightKind
): languages.DocumentHighlightKind {
	switch (kind) {
		case lsTypes.DocumentHighlightKind.Read:
			return languages.DocumentHighlightKind.Read;
		case lsTypes.DocumentHighlightKind.Write:
			return languages.DocumentHighlightKind.Write;
		case lsTypes.DocumentHighlightKind.Text:
			return languages.DocumentHighlightKind.Text;
	}
	return languages.DocumentHighlightKind.Text;
}

//#endregion

//#region DefinitionAdapter

export interface ILanguageWorkerWithDefinitions {
	findDefinition(uri: string, position: lsTypes.Position): Promise<lsTypes.Location>;
}

export class DefinitionAdapter<T extends ILanguageWorkerWithDefinitions>
	implements languages.DefinitionProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	public provideDefinition(
		model: editor.IReadOnlyModel,
		position: Position,
		token: CancellationToken
	): Promise<languages.Definition> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => {
				return worker.findDefinition(resource.toString(), fromPosition(position));
			})
			.then((definition) => {
				if (!definition) {
					return;
				}
				return [toLocation(definition)];
			});
	}
}

function toLocation(location: lsTypes.Location): languages.Location {
	return {
		uri: Uri.parse(location.uri),
		range: toRange(location.range)
	};
}

//#endregion

//#region ReferenceAdapter

export interface ILanguageWorkerWithReferences {
	findReferences(uri: string, position: lsTypes.Position): Promise<lsTypes.Location[]>;
}

export class ReferenceAdapter<T extends ILanguageWorkerWithReferences>
	implements languages.ReferenceProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	provideReferences(
		model: editor.IReadOnlyModel,
		position: Position,
		context: languages.ReferenceContext,
		token: CancellationToken
	): Promise<languages.Location[]> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => {
				return worker.findReferences(resource.toString(), fromPosition(position));
			})
			.then((entries) => {
				if (!entries) {
					return;
				}
				return entries.map(toLocation);
			});
	}
}

//#endregion

//#region RenameAdapter

export interface ILanguageWorkerWithRename {
	doRename(
		uri: string,
		position: lsTypes.Position,
		newName: string
	): Promise<lsTypes.WorkspaceEdit>;
}

export class RenameAdapter<T extends ILanguageWorkerWithRename>
	implements languages.RenameProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	provideRenameEdits(
		model: editor.IReadOnlyModel,
		position: Position,
		newName: string,
		token: CancellationToken
	): Promise<languages.WorkspaceEdit> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => {
				return worker.doRename(resource.toString(), fromPosition(position), newName);
			})
			.then((edit) => {
				return toWorkspaceEdit(edit);
			});
	}
}

function toWorkspaceEdit(edit: lsTypes.WorkspaceEdit): languages.WorkspaceEdit {
	if (!edit || !edit.changes) {
		return void 0;
	}
	let resourceEdits: languages.WorkspaceTextEdit[] = [];
	for (let uri in edit.changes) {
		const _uri = Uri.parse(uri);
		for (let e of edit.changes[uri]) {
			resourceEdits.push({
				resource: _uri,
				edit: {
					range: toRange(e.range),
					text: e.newText
				}
			});
		}
	}
	return {
		edits: resourceEdits
	};
}

//#endregion

//#region DocumentSymbolAdapter

export interface ILanguageWorkerWithDocumentSymbols {
	findDocumentSymbols(uri: string): Promise<lsTypes.SymbolInformation[]>;
}

export class DocumentSymbolAdapter<T extends ILanguageWorkerWithDocumentSymbols>
	implements languages.DocumentSymbolProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	public provideDocumentSymbols(
		model: editor.IReadOnlyModel,
		token: CancellationToken
	): Promise<languages.DocumentSymbol[] | undefined> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => worker.findDocumentSymbols(resource.toString()))
			.then((items) => {
				if (!items) {
					return;
				}
				return items.map((item) => ({
					name: item.name,
					detail: '',
					containerName: item.containerName,
					kind: toSymbolKind(item.kind),
					range: toRange(item.location.range),
					selectionRange: toRange(item.location.range),
					tags: []
				}));
			});
	}
}

function toSymbolKind(kind: lsTypes.SymbolKind): languages.SymbolKind {
	let mKind = languages.SymbolKind;

	switch (kind) {
		case lsTypes.SymbolKind.File:
			return mKind.Array;
		case lsTypes.SymbolKind.Module:
			return mKind.Module;
		case lsTypes.SymbolKind.Namespace:
			return mKind.Namespace;
		case lsTypes.SymbolKind.Package:
			return mKind.Package;
		case lsTypes.SymbolKind.Class:
			return mKind.Class;
		case lsTypes.SymbolKind.Method:
			return mKind.Method;
		case lsTypes.SymbolKind.Property:
			return mKind.Property;
		case lsTypes.SymbolKind.Field:
			return mKind.Field;
		case lsTypes.SymbolKind.Constructor:
			return mKind.Constructor;
		case lsTypes.SymbolKind.Enum:
			return mKind.Enum;
		case lsTypes.SymbolKind.Interface:
			return mKind.Interface;
		case lsTypes.SymbolKind.Function:
			return mKind.Function;
		case lsTypes.SymbolKind.Variable:
			return mKind.Variable;
		case lsTypes.SymbolKind.Constant:
			return mKind.Constant;
		case lsTypes.SymbolKind.String:
			return mKind.String;
		case lsTypes.SymbolKind.Number:
			return mKind.Number;
		case lsTypes.SymbolKind.Boolean:
			return mKind.Boolean;
		case lsTypes.SymbolKind.Array:
			return mKind.Array;
	}
	return mKind.Function;
}

//#endregion

//#region DocumentLinkAdapter

export interface ILanguageWorkerWithDocumentLinks {
	findDocumentLinks(uri: string): Promise<lsTypes.DocumentLink[]>;
}

export class DocumentLinkAdapter<T extends ILanguageWorkerWithDocumentLinks>
	implements languages.LinkProvider
{
	constructor(private _worker: WorkerAccessor<T>) {}

	public provideLinks(
		model: editor.IReadOnlyModel,
		token: CancellationToken
	): Promise<languages.ILinksList> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => worker.findDocumentLinks(resource.toString()))
			.then((items) => {
				if (!items) {
					return;
				}
				return {
					links: items.map((item) => ({
						range: toRange(item.range),
						url: item.target
					}))
				};
			});
	}
}

//#endregion

//#region DocumentFormattingEditProvider, DocumentRangeFormattingEditProvider

export interface ILanguageWorkerWithFormat {
	format(
		uri: string,
		range: lsTypes.Range | null,
		options: lsTypes.FormattingOptions
	): Promise<lsTypes.TextEdit[]>;
}

export class DocumentFormattingEditProvider<T extends ILanguageWorkerWithFormat>
	implements languages.DocumentFormattingEditProvider
{
	constructor(private _worker: WorkerAccessor<T>) {}

	public provideDocumentFormattingEdits(
		model: editor.IReadOnlyModel,
		options: languages.FormattingOptions,
		token: CancellationToken
	): Promise<languages.TextEdit[] | undefined> {
		const resource = model.uri;

		return this._worker(resource).then((worker) => {
			return worker
				.format(resource.toString(), null, fromFormattingOptions(options))
				.then((edits) => {
					if (!edits || edits.length === 0) {
						return;
					}
					return edits.map<languages.TextEdit>(toTextEdit);
				});
		});
	}
}

export class DocumentRangeFormattingEditProvider<T extends ILanguageWorkerWithFormat>
	implements languages.DocumentRangeFormattingEditProvider
{
	constructor(private _worker: WorkerAccessor<T>) {}

	public provideDocumentRangeFormattingEdits(
		model: editor.IReadOnlyModel,
		range: Range,
		options: languages.FormattingOptions,
		token: CancellationToken
	): Promise<languages.TextEdit[] | undefined> {
		const resource = model.uri;

		return this._worker(resource).then((worker) => {
			return worker
				.format(resource.toString(), fromRange(range), fromFormattingOptions(options))
				.then((edits) => {
					if (!edits || edits.length === 0) {
						return;
					}
					return edits.map<languages.TextEdit>(toTextEdit);
				});
		});
	}
}

function fromFormattingOptions(options: languages.FormattingOptions): lsTypes.FormattingOptions {
	return {
		tabSize: options.tabSize,
		insertSpaces: options.insertSpaces
	};
}

//#endregion

//#region DocumentColorAdapter

export interface ILanguageWorkerWithDocumentColors {
	findDocumentColors(uri: string): Promise<lsTypes.ColorInformation[]>;
	getColorPresentations(
		uri: string,
		color: lsTypes.Color,
		range: lsTypes.Range
	): Promise<lsTypes.ColorPresentation[]>;
}

export class DocumentColorAdapter<T extends ILanguageWorkerWithDocumentColors>
	implements languages.DocumentColorProvider
{
	constructor(private readonly _worker: WorkerAccessor<T>) {}

	public provideDocumentColors(
		model: editor.IReadOnlyModel,
		token: CancellationToken
	): Promise<languages.IColorInformation[] | undefined> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) => worker.findDocumentColors(resource.toString()))
			.then((infos) => {
				if (!infos) {
					return;
				}
				return infos.map((item) => ({
					color: item.color,
					range: toRange(item.range)
				}));
			});
	}

	public provideColorPresentations(
		model: editor.IReadOnlyModel,
		info: languages.IColorInformation,
		token: CancellationToken
	): Promise<languages.IColorPresentation[] | undefined> {
		const resource = model.uri;

		return this._worker(resource)
			.then((worker) =>
				worker.getColorPresentations(resource.toString(), info.color, fromRange(info.range))
			)
			.then((presentations) => {
				if (!presentations) {
					return;
				}
				return presentations.map((presentation) => {
					let item: languages.IColorPresentation = {
						label: presentation.label
					};
					if (presentation.textEdit) {
						item.textEdit = toTextEdit(presentation.textEdit);
					}
					if (presentation.additionalTextEdits) {
						item.additionalTextEdits =
							presentation.additionalTextEdits.map<languages.TextEdit>(toTextEdit);
					}
					return item;
				});
			});
	}
}

//#endregion