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

import * as assert from 'assert';
import { setUnexpectedErrorHandler, errorHandler } from 'vs/base/common/errors';
import { TestInstantiationService } from 'vs/platform/instantiation/test/common/instantiationServiceMock';
import { URI } from 'vs/base/common/uri';
import * as types from 'vs/workbench/api/node/extHostTypes';
import { TextModel as EditorModel } from 'vs/editor/common/model/textModel';
import { TestRPCProtocol } from './testRPCProtocol';
import { MarkerService } from 'vs/platform/markers/common/markerService';
import { IMarkerService } from 'vs/platform/markers/common/markers';
import { ICommandService, CommandsRegistry } from 'vs/platform/commands/common/commands';
import { IModelService } from 'vs/editor/common/services/modelService';
import { ExtHostLanguageFeatures } from 'vs/workbench/api/node/extHostLanguageFeatures';
import { MainThreadLanguageFeatures } from 'vs/workbench/api/browser/mainThreadLanguageFeatures';
import { IHeapService, NullHeapService } from 'vs/workbench/services/heap/common/heap';
import { ExtHostApiCommands } from 'vs/workbench/api/node/extHostApiCommands';
import { ExtHostCommands } from 'vs/workbench/api/node/extHostCommands';
import { ExtHostHeapService } from 'vs/workbench/api/node/extHostHeapService';
import { MainThreadCommands } from 'vs/workbench/api/browser/mainThreadCommands';
import { ExtHostDocuments } from 'vs/workbench/api/node/extHostDocuments';
import { ExtHostDocumentsAndEditors } from 'vs/workbench/api/node/extHostDocumentsAndEditors';
import { MainContext, ExtHostContext } from 'vs/workbench/api/common/extHost.protocol';
import { ExtHostDiagnostics } from 'vs/workbench/api/node/extHostDiagnostics';
import * as vscode from 'vscode';
import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import 'vs/workbench/contrib/search/browser/search.contribution';
import { NullLogService } from 'vs/platform/log/common/log';
import { ITextModel } from 'vs/editor/common/model';
import { nullExtensionDescription } from 'vs/workbench/services/extensions/common/extensions';
import { dispose } from 'vs/base/common/lifecycle';

const defaultSelector = { scheme: 'far' };
const model: ITextModel = EditorModel.createFromString(
	[
		'This is the first line',
		'This is the second line',
		'This is the third line',
	].join('\n'),
	undefined,
	undefined,
	URI.parse('far://testing/file.b'));

let rpcProtocol: TestRPCProtocol;
let extHost: ExtHostLanguageFeatures;
let mainThread: MainThreadLanguageFeatures;
let commands: ExtHostCommands;
let disposables: vscode.Disposable[] = [];
let originalErrorHandler: (e: any) => any;

function assertRejects(fn: () => Promise<any>, message: string = 'Expected rejection') {
	return fn().then(() => assert.ok(false, message), _err => assert.ok(true));
}

suite('ExtHostLanguageFeatureCommands', function () {

	suiteSetup(() => {

		originalErrorHandler = errorHandler.getUnexpectedErrorHandler();
		setUnexpectedErrorHandler(() => { });

		// Use IInstantiationService to get typechecking when instantiating
		let inst: IInstantiationService;
		{
			let instantiationService = new TestInstantiationService();
			rpcProtocol = new TestRPCProtocol();
			instantiationService.stub(IHeapService, NullHeapService);
			instantiationService.stub(ICommandService, {
				_serviceBrand: undefined,
				executeCommand(id: string, args: any): any {
					if (!CommandsRegistry.getCommands()[id]) {
						return Promise.reject(new Error(id + ' NOT known'));
					}
					let { handler } = CommandsRegistry.getCommands()[id];
					return Promise.resolve(instantiationService.invokeFunction(handler, args));
				}
			});
			instantiationService.stub(IMarkerService, new MarkerService());
			instantiationService.stub(IModelService, <IModelService>{
				_serviceBrand: IModelService,
				getModel(): any { return model; },
				createModel() { throw new Error(); },
				updateModel() { throw new Error(); },
				setMode() { throw new Error(); },
				destroyModel() { throw new Error(); },
				getModels() { throw new Error(); },
				onModelAdded: undefined!,
				onModelModeChanged: undefined!,
				onModelRemoved: undefined!,
				getCreationOptions() { throw new Error(); }
			});
			inst = instantiationService;
		}

		const extHostDocumentsAndEditors = new ExtHostDocumentsAndEditors(rpcProtocol);
		extHostDocumentsAndEditors.$acceptDocumentsAndEditorsDelta({
			addedDocuments: [{
				isDirty: false,
				versionId: model.getVersionId(),
				modeId: model.getLanguageIdentifier().language,
				uri: model.uri,
				lines: model.getValue().split(model.getEOL()),
				EOL: model.getEOL(),
			}]
		});
		const extHostDocuments = new ExtHostDocuments(rpcProtocol, extHostDocumentsAndEditors);
		rpcProtocol.set(ExtHostContext.ExtHostDocuments, extHostDocuments);

		const heapService = new ExtHostHeapService();

		commands = new ExtHostCommands(rpcProtocol, heapService, new NullLogService());
		rpcProtocol.set(ExtHostContext.ExtHostCommands, commands);
		rpcProtocol.set(MainContext.MainThreadCommands, inst.createInstance(MainThreadCommands, rpcProtocol));
		ExtHostApiCommands.register(commands);

		const diagnostics = new ExtHostDiagnostics(rpcProtocol);
		rpcProtocol.set(ExtHostContext.ExtHostDiagnostics, diagnostics);

		extHost = new ExtHostLanguageFeatures(rpcProtocol, null, extHostDocuments, commands, heapService, diagnostics, new NullLogService());
		rpcProtocol.set(ExtHostContext.ExtHostLanguageFeatures, extHost);

		mainThread = rpcProtocol.set(MainContext.MainThreadLanguageFeatures, inst.createInstance(MainThreadLanguageFeatures, rpcProtocol));

		return rpcProtocol.sync();
	});

	suiteTeardown(() => {
		setUnexpectedErrorHandler(originalErrorHandler);
		model.dispose();
		mainThread.dispose();
	});

	teardown(() => {
		disposables = dispose(disposables);
		return rpcProtocol.sync();
	});

	// --- workspace symbols

	test('WorkspaceSymbols, invalid arguments', function () {
		let promises = [
			assertRejects(() => commands.executeCommand('vscode.executeWorkspaceSymbolProvider')),
			assertRejects(() => commands.executeCommand('vscode.executeWorkspaceSymbolProvider', null)),
			assertRejects(() => commands.executeCommand('vscode.executeWorkspaceSymbolProvider', undefined)),
			assertRejects(() => commands.executeCommand('vscode.executeWorkspaceSymbolProvider', true))
		];
		return Promise.all(promises);
	});

	test('WorkspaceSymbols, back and forth', function () {

		disposables.push(extHost.registerWorkspaceSymbolProvider(nullExtensionDescription, <vscode.WorkspaceSymbolProvider>{
			provideWorkspaceSymbols(query): any {
				return [
					new types.SymbolInformation(query, types.SymbolKind.Array, new types.Range(0, 0, 1, 1), URI.parse('far://testing/first')),
					new types.SymbolInformation(query, types.SymbolKind.Array, new types.Range(0, 0, 1, 1), URI.parse('far://testing/second'))
				];
			}
		}));

		disposables.push(extHost.registerWorkspaceSymbolProvider(nullExtensionDescription, <vscode.WorkspaceSymbolProvider>{
			provideWorkspaceSymbols(query): any {
				return [
					new types.SymbolInformation(query, types.SymbolKind.Array, new types.Range(0, 0, 1, 1), URI.parse('far://testing/first'))
				];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.SymbolInformation[]>('vscode.executeWorkspaceSymbolProvider', 'testing').then(value => {

				for (let info of value) {
					assert.ok(info instanceof types.SymbolInformation);
					assert.equal(info.name, 'testing');
					assert.equal(info.kind, types.SymbolKind.Array);
				}
				assert.equal(value.length, 3);
			});
		});
	});

	test('executeWorkspaceSymbolProvider should accept empty string, #39522', async function () {

		disposables.push(extHost.registerWorkspaceSymbolProvider(nullExtensionDescription, {
			provideWorkspaceSymbols(query): vscode.SymbolInformation[] {
				return [new types.SymbolInformation('hello', types.SymbolKind.Array, new types.Range(0, 0, 0, 0), URI.parse('foo:bar')) as vscode.SymbolInformation];
			}
		}));

		await rpcProtocol.sync();
		let symbols = await commands.executeCommand<vscode.SymbolInformation[]>('vscode.executeWorkspaceSymbolProvider', '');
		assert.equal(symbols.length, 1);

		await rpcProtocol.sync();
		symbols = await commands.executeCommand<vscode.SymbolInformation[]>('vscode.executeWorkspaceSymbolProvider', '*');
		assert.equal(symbols.length, 1);
	});

	// --- definition

	test('Definition, invalid arguments', function () {
		let promises = [
			assertRejects(() => commands.executeCommand('vscode.executeDefinitionProvider')),
			assertRejects(() => commands.executeCommand('vscode.executeDefinitionProvider', null)),
			assertRejects(() => commands.executeCommand('vscode.executeDefinitionProvider', undefined)),
			assertRejects(() => commands.executeCommand('vscode.executeDefinitionProvider', true, false))
		];

		return Promise.all(promises);
	});

	test('Definition, back and forth', function () {

		disposables.push(extHost.registerDefinitionProvider(nullExtensionDescription, defaultSelector, <vscode.DefinitionProvider>{
			provideDefinition(doc: any): any {
				return new types.Location(doc.uri, new types.Range(0, 0, 0, 0));
			}
		}));
		disposables.push(extHost.registerDefinitionProvider(nullExtensionDescription, defaultSelector, <vscode.DefinitionProvider>{
			provideDefinition(doc: any): any {
				return [
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
				];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.Location[]>('vscode.executeDefinitionProvider', model.uri, new types.Position(0, 0)).then(values => {
				assert.equal(values.length, 4);
				for (let v of values) {
					assert.ok(v.uri instanceof URI);
					assert.ok(v.range instanceof types.Range);
				}
			});
		});
	});

	// --- declaration

	test('Declaration, back and forth', function () {

		disposables.push(extHost.registerDeclarationProvider(nullExtensionDescription, defaultSelector, <vscode.DeclarationProvider>{
			provideDeclaration(doc: any): any {
				return new types.Location(doc.uri, new types.Range(0, 0, 0, 0));
			}
		}));
		disposables.push(extHost.registerDeclarationProvider(nullExtensionDescription, defaultSelector, <vscode.DeclarationProvider>{
			provideDeclaration(doc: any): any {
				return [
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
				];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.Location[]>('vscode.executeDeclarationProvider', model.uri, new types.Position(0, 0)).then(values => {
				assert.equal(values.length, 4);
				for (let v of values) {
					assert.ok(v.uri instanceof URI);
					assert.ok(v.range instanceof types.Range);
				}
			});
		});
	});

	// --- type definition

	test('Type Definition, invalid arguments', function () {
		const promises = [
			assertRejects(() => commands.executeCommand('vscode.executeTypeDefinitionProvider')),
			assertRejects(() => commands.executeCommand('vscode.executeTypeDefinitionProvider', null)),
			assertRejects(() => commands.executeCommand('vscode.executeTypeDefinitionProvider', undefined)),
			assertRejects(() => commands.executeCommand('vscode.executeTypeDefinitionProvider', true, false))
		];

		return Promise.all(promises);
	});

	test('Type Definition, back and forth', function () {

		disposables.push(extHost.registerTypeDefinitionProvider(nullExtensionDescription, defaultSelector, <vscode.TypeDefinitionProvider>{
			provideTypeDefinition(doc: any): any {
				return new types.Location(doc.uri, new types.Range(0, 0, 0, 0));
			}
		}));
		disposables.push(extHost.registerTypeDefinitionProvider(nullExtensionDescription, defaultSelector, <vscode.TypeDefinitionProvider>{
			provideTypeDefinition(doc: any): any {
				return [
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
					new types.Location(doc.uri, new types.Range(0, 0, 0, 0)),
				];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.Location[]>('vscode.executeTypeDefinitionProvider', model.uri, new types.Position(0, 0)).then(values => {
				assert.equal(values.length, 4);
				for (const v of values) {
					assert.ok(v.uri instanceof URI);
					assert.ok(v.range instanceof types.Range);
				}
			});
		});
	});

	// --- references

	test('reference search, back and forth', function () {

		disposables.push(extHost.registerReferenceProvider(nullExtensionDescription, defaultSelector, <vscode.ReferenceProvider>{
			provideReferences(doc: any) {
				return [
					new types.Location(URI.parse('some:uri/path'), new types.Range(0, 1, 0, 5))
				];
			}
		}));

		return commands.executeCommand<vscode.Location[]>('vscode.executeReferenceProvider', model.uri, new types.Position(0, 0)).then(values => {
			assert.equal(values.length, 1);
			let [first] = values;
			assert.equal(first.uri.toString(), 'some:uri/path');
			assert.equal(first.range.start.line, 0);
			assert.equal(first.range.start.character, 1);
			assert.equal(first.range.end.line, 0);
			assert.equal(first.range.end.character, 5);
		});
	});

	// --- outline

	test('Outline, back and forth', function () {
		disposables.push(extHost.registerDocumentSymbolProvider(nullExtensionDescription, defaultSelector, <vscode.DocumentSymbolProvider>{
			provideDocumentSymbols(): any {
				return [
					new types.SymbolInformation('testing1', types.SymbolKind.Enum, new types.Range(1, 0, 1, 0)),
					new types.SymbolInformation('testing2', types.SymbolKind.Enum, new types.Range(0, 1, 0, 3)),
				];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.SymbolInformation[]>('vscode.executeDocumentSymbolProvider', model.uri).then(values => {
				assert.equal(values.length, 2);
				let [first, second] = values;
				assert.ok(first instanceof types.SymbolInformation);
				assert.ok(second instanceof types.SymbolInformation);
				assert.equal(first.name, 'testing2');
				assert.equal(second.name, 'testing1');
			});
		});
	});

	test('vscode.executeDocumentSymbolProvider command only returns SymbolInformation[] rather than DocumentSymbol[] #57984', function () {
		disposables.push(extHost.registerDocumentSymbolProvider(nullExtensionDescription, defaultSelector, <vscode.DocumentSymbolProvider>{
			provideDocumentSymbols(): any {
				return [
					new types.SymbolInformation('SymbolInformation', types.SymbolKind.Enum, new types.Range(1, 0, 1, 0))
				];
			}
		}));
		disposables.push(extHost.registerDocumentSymbolProvider(nullExtensionDescription, defaultSelector, <vscode.DocumentSymbolProvider>{
			provideDocumentSymbols(): any {
				let root = new types.DocumentSymbol('DocumentSymbol', 'DocumentSymbol#detail', types.SymbolKind.Enum, new types.Range(1, 0, 1, 0), new types.Range(1, 0, 1, 0));
				root.children = [new types.DocumentSymbol('DocumentSymbol#child', 'DocumentSymbol#detail#child', types.SymbolKind.Enum, new types.Range(1, 0, 1, 0), new types.Range(1, 0, 1, 0))];
				return [root];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<(vscode.SymbolInformation & vscode.DocumentSymbol)[]>('vscode.executeDocumentSymbolProvider', model.uri).then(values => {
				assert.equal(values.length, 2);
				let [first, second] = values;
				assert.ok(first instanceof types.SymbolInformation);
				assert.ok(!(first instanceof types.DocumentSymbol));
				assert.ok(second instanceof types.SymbolInformation);
				assert.equal(first.name, 'DocumentSymbol');
				assert.equal(first.children.length, 1);
				assert.equal(second.name, 'SymbolInformation');
			});
		});
	});

	// --- suggest

	test('Suggest, back and forth', function () {
		disposables.push(extHost.registerCompletionItemProvider(nullExtensionDescription, defaultSelector, <vscode.CompletionItemProvider>{
			provideCompletionItems(doc, pos): any {
				let a = new types.CompletionItem('item1');
				let b = new types.CompletionItem('item2');
				b.textEdit = types.TextEdit.replace(new types.Range(0, 4, 0, 8), 'foo'); // overwite after
				let c = new types.CompletionItem('item3');
				c.textEdit = types.TextEdit.replace(new types.Range(0, 1, 0, 6), 'foobar'); // overwite before & after

				// snippet string!
				let d = new types.CompletionItem('item4');
				d.range = new types.Range(0, 1, 0, 4);// overwite before
				d.insertText = new types.SnippetString('foo$0bar');
				return [a, b, c, d];
			}
		}, []));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.CompletionList>('vscode.executeCompletionItemProvider', model.uri, new types.Position(0, 4)).then(list => {

				assert.ok(list instanceof types.CompletionList);
				let values = list.items;
				assert.ok(Array.isArray(values));
				assert.equal(values.length, 4);
				let [first, second, third, fourth] = values;
				assert.equal(first.label, 'item1');
				assert.equal(first.textEdit!.newText, 'item1');
				assert.equal(first.textEdit!.range.start.line, 0);
				assert.equal(first.textEdit!.range.start.character, 0);
				assert.equal(first.textEdit!.range.end.line, 0);
				assert.equal(first.textEdit!.range.end.character, 4);

				assert.equal(second.label, 'item2');
				assert.equal(second.textEdit!.newText, 'foo');
				assert.equal(second.textEdit!.range.start.line, 0);
				assert.equal(second.textEdit!.range.start.character, 4);
				assert.equal(second.textEdit!.range.end.line, 0);
				assert.equal(second.textEdit!.range.end.character, 8);

				assert.equal(third.label, 'item3');
				assert.equal(third.textEdit!.newText, 'foobar');
				assert.equal(third.textEdit!.range.start.line, 0);
				assert.equal(third.textEdit!.range.start.character, 1);
				assert.equal(third.textEdit!.range.end.line, 0);
				assert.equal(third.textEdit!.range.end.character, 6);

				assert.equal(fourth.label, 'item4');
				assert.equal(fourth.textEdit, undefined);
				assert.equal(fourth.range!.start.line, 0);
				assert.equal(fourth.range!.start.character, 1);
				assert.equal(fourth.range!.end.line, 0);
				assert.equal(fourth.range!.end.character, 4);
				assert.ok(fourth.insertText instanceof types.SnippetString);
				assert.equal((<types.SnippetString>fourth.insertText).value, 'foo$0bar');
			});
		});
	});

	test('Suggest, return CompletionList !array', function () {
		disposables.push(extHost.registerCompletionItemProvider(nullExtensionDescription, defaultSelector, <vscode.CompletionItemProvider>{
			provideCompletionItems(): any {
				let a = new types.CompletionItem('item1');
				let b = new types.CompletionItem('item2');
				return new types.CompletionList(<any>[a, b], true);
			}
		}, []));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.CompletionList>('vscode.executeCompletionItemProvider', model.uri, new types.Position(0, 4)).then(list => {
				assert.ok(list instanceof types.CompletionList);
				assert.equal(list.isIncomplete, true);
			});
		});
	});

	test('Suggest, resolve completion items', async function () {

		let resolveCount = 0;

		disposables.push(extHost.registerCompletionItemProvider(nullExtensionDescription, defaultSelector, <vscode.CompletionItemProvider>{
			provideCompletionItems(): any {
				let a = new types.CompletionItem('item1');
				let b = new types.CompletionItem('item2');
				let c = new types.CompletionItem('item3');
				let d = new types.CompletionItem('item4');
				return new types.CompletionList([a, b, c, d], false);
			},
			resolveCompletionItem(item) {
				resolveCount += 1;
				return item;
			}
		}, []));

		await rpcProtocol.sync();

		let list = await commands.executeCommand<vscode.CompletionList>(
			'vscode.executeCompletionItemProvider',
			model.uri,
			new types.Position(0, 4),
			undefined,
			2 // maxItemsToResolve
		);

		assert.ok(list instanceof types.CompletionList);
		assert.equal(resolveCount, 2);

	});

	test('"vscode.executeCompletionItemProvider" doesnot return a preselect field #53749', async function () {
		disposables.push(extHost.registerCompletionItemProvider(nullExtensionDescription, defaultSelector, <vscode.CompletionItemProvider>{
			provideCompletionItems(): any {
				let a = new types.CompletionItem('item1');
				a.preselect = true;
				let b = new types.CompletionItem('item2');
				let c = new types.CompletionItem('item3');
				c.preselect = true;
				let d = new types.CompletionItem('item4');
				return new types.CompletionList([a, b, c, d], false);
			}
		}, []));

		await rpcProtocol.sync();

		let list = await commands.executeCommand<vscode.CompletionList>(
			'vscode.executeCompletionItemProvider',
			model.uri,
			new types.Position(0, 4),
			undefined
		);

		assert.ok(list instanceof types.CompletionList);
		assert.equal(list.items.length, 4);

		let [a, b, c, d] = list.items;
		assert.equal(a.preselect, true);
		assert.equal(b.preselect, undefined);
		assert.equal(c.preselect, true);
		assert.equal(d.preselect, undefined);
	});

	test('executeCompletionItemProvider doesn\'t capture commitCharacters #58228', async function () {
		disposables.push(extHost.registerCompletionItemProvider(nullExtensionDescription, defaultSelector, <vscode.CompletionItemProvider>{
			provideCompletionItems(): any {
				let a = new types.CompletionItem('item1');
				a.commitCharacters = ['a', 'b'];
				let b = new types.CompletionItem('item2');
				return new types.CompletionList([a, b], false);
			}
		}, []));

		await rpcProtocol.sync();

		let list = await commands.executeCommand<vscode.CompletionList>(
			'vscode.executeCompletionItemProvider',
			model.uri,
			new types.Position(0, 4),
			undefined
		);

		assert.ok(list instanceof types.CompletionList);
		assert.equal(list.items.length, 2);

		let [a, b] = list.items;
		assert.deepEqual(a.commitCharacters, ['a', 'b']);
		assert.equal(b.commitCharacters, undefined);
	});

	// --- signatureHelp

	test('Parameter Hints, back and forth', async () => {
		disposables.push(extHost.registerSignatureHelpProvider(nullExtensionDescription, defaultSelector, new class implements vscode.SignatureHelpProvider {
			provideSignatureHelp(_document: vscode.TextDocument, _position: vscode.Position, _token: vscode.CancellationToken, context: vscode.SignatureHelpContext): vscode.SignatureHelp {
				return {
					activeSignature: 0,
					activeParameter: 1,
					signatures: [
						{
							label: 'abc',
							documentation: `${context.triggerKind === 1 /* vscode.SignatureHelpTriggerKind.Invoke */ ? 'invoked' : 'unknown'} ${context.triggerCharacter}`,
							parameters: []
						}
					]
				};
			}
		}, []));

		await rpcProtocol.sync();

		const firstValue = await commands.executeCommand<vscode.SignatureHelp>('vscode.executeSignatureHelpProvider', model.uri, new types.Position(0, 1), ',');
		assert.strictEqual(firstValue.activeSignature, 0);
		assert.strictEqual(firstValue.activeParameter, 1);
		assert.strictEqual(firstValue.signatures.length, 1);
		assert.strictEqual(firstValue.signatures[0].label, 'abc');
		assert.strictEqual(firstValue.signatures[0].documentation, 'invoked ,');
	});

	// --- quickfix

	test('QuickFix, back and forth', function () {
		disposables.push(extHost.registerCodeActionProvider(nullExtensionDescription, defaultSelector, {
			provideCodeActions(): vscode.Command[] {
				return [{ command: 'testing', title: 'Title', arguments: [1, 2, true] }];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.Command[]>('vscode.executeCodeActionProvider', model.uri, new types.Range(0, 0, 1, 1)).then(value => {
				assert.equal(value.length, 1);
				let [first] = value;
				assert.equal(first.title, 'Title');
				assert.equal(first.command, 'testing');
				assert.deepEqual(first.arguments, [1, 2, true]);
			});
		});
	});

	test('vscode.executeCodeActionProvider results seem to be missing their `command` property #45124', function () {
		disposables.push(extHost.registerCodeActionProvider(nullExtensionDescription, defaultSelector, {
			provideCodeActions(document, range): vscode.CodeAction[] {
				return [{
					command: {
						arguments: [document, range],
						command: 'command',
						title: 'command_title',
					},
					kind: types.CodeActionKind.Empty.append('foo'),
					title: 'title',
				}];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.CodeAction[]>('vscode.executeCodeActionProvider', model.uri, new types.Range(0, 0, 1, 1)).then(value => {
				assert.equal(value.length, 1);
				const [first] = value;
				assert.ok(first.command);
				assert.equal(first.command!.command, 'command');
				assert.equal(first.command!.title, 'command_title');
				assert.equal(first.kind!.value, 'foo');
				assert.equal(first.title, 'title');

			});
		});
	});

	// --- code lens

	test('CodeLens, back and forth', function () {

		const complexArg = {
			foo() { },
			bar() { },
			big: extHost
		};

		disposables.push(extHost.registerCodeLensProvider(nullExtensionDescription, defaultSelector, <vscode.CodeLensProvider>{
			provideCodeLenses(): any {
				return [new types.CodeLens(new types.Range(0, 0, 1, 1), { title: 'Title', command: 'cmd', arguments: [1, true, complexArg] })];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.CodeLens[]>('vscode.executeCodeLensProvider', model.uri).then(value => {
				assert.equal(value.length, 1);
				const [first] = value;

				assert.equal(first.command!.title, 'Title');
				assert.equal(first.command!.command, 'cmd');
				assert.equal(first.command!.arguments![0], 1);
				assert.equal(first.command!.arguments![1], true);
				assert.equal(first.command!.arguments![2], complexArg);
			});
		});
	});

	test('CodeLens, resolve', async function () {

		let resolveCount = 0;

		disposables.push(extHost.registerCodeLensProvider(nullExtensionDescription, defaultSelector, <vscode.CodeLensProvider>{
			provideCodeLenses(): any {
				return [
					new types.CodeLens(new types.Range(0, 0, 1, 1)),
					new types.CodeLens(new types.Range(0, 0, 1, 1)),
					new types.CodeLens(new types.Range(0, 0, 1, 1)),
					new types.CodeLens(new types.Range(0, 0, 1, 1), { title: 'Already resolved', command: 'fff' })
				];
			},
			resolveCodeLens(codeLens: types.CodeLens) {
				codeLens.command = { title: resolveCount.toString(), command: 'resolved' };
				resolveCount += 1;
				return codeLens;
			}
		}));

		await rpcProtocol.sync();

		let value = await commands.executeCommand<vscode.CodeLens[]>('vscode.executeCodeLensProvider', model.uri, 2);

		assert.equal(value.length, 3); // the resolve argument defines the number of results being returned
		assert.equal(resolveCount, 2);

		resolveCount = 0;
		value = await commands.executeCommand<vscode.CodeLens[]>('vscode.executeCodeLensProvider', model.uri);

		assert.equal(value.length, 4);
		assert.equal(resolveCount, 0);
	});

	test('Links, back and forth', function () {

		disposables.push(extHost.registerDocumentLinkProvider(nullExtensionDescription, defaultSelector, <vscode.DocumentLinkProvider>{
			provideDocumentLinks(): any {
				return [new types.DocumentLink(new types.Range(0, 0, 0, 20), URI.parse('foo:bar'))];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.DocumentLink[]>('vscode.executeLinkProvider', model.uri).then(value => {
				assert.equal(value.length, 1);
				let [first] = value;

				assert.equal(first.target + '', 'foo:bar');
				assert.equal(first.range.start.line, 0);
				assert.equal(first.range.start.character, 0);
				assert.equal(first.range.end.line, 0);
				assert.equal(first.range.end.character, 20);
			});
		});
	});


	test('Color provider', function () {

		disposables.push(extHost.registerColorProvider(nullExtensionDescription, defaultSelector, <vscode.DocumentColorProvider>{
			provideDocumentColors(): vscode.ColorInformation[] {
				return [new types.ColorInformation(new types.Range(0, 0, 0, 20), new types.Color(0.1, 0.2, 0.3, 0.4))];
			},
			provideColorPresentations(color: vscode.Color, context: { range: vscode.Range, document: vscode.TextDocument }): vscode.ColorPresentation[] {
				const cp = new types.ColorPresentation('#ABC');
				cp.textEdit = types.TextEdit.replace(new types.Range(1, 0, 1, 20), '#ABC');
				cp.additionalTextEdits = [types.TextEdit.insert(new types.Position(2, 20), '*')];
				return [cp];
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.ColorInformation[]>('vscode.executeDocumentColorProvider', model.uri).then(value => {
				assert.equal(value.length, 1);
				let [first] = value;

				assert.equal(first.color.red, 0.1);
				assert.equal(first.color.green, 0.2);
				assert.equal(first.color.blue, 0.3);
				assert.equal(first.color.alpha, 0.4);
				assert.equal(first.range.start.line, 0);
				assert.equal(first.range.start.character, 0);
				assert.equal(first.range.end.line, 0);
				assert.equal(first.range.end.character, 20);
			});
		}).then(() => {
			const color = new types.Color(0.5, 0.6, 0.7, 0.8);
			const range = new types.Range(0, 0, 0, 20);
			return commands.executeCommand<vscode.ColorPresentation[]>('vscode.executeColorPresentationProvider', color, { uri: model.uri, range }).then(value => {
				assert.equal(value.length, 1);
				let [first] = value;

				assert.equal(first.label, '#ABC');
				assert.equal(first.textEdit!.newText, '#ABC');
				assert.equal(first.textEdit!.range.start.line, 1);
				assert.equal(first.textEdit!.range.start.character, 0);
				assert.equal(first.textEdit!.range.end.line, 1);
				assert.equal(first.textEdit!.range.end.character, 20);
				assert.equal(first.additionalTextEdits!.length, 1);
				assert.equal(first.additionalTextEdits![0].range.start.line, 2);
				assert.equal(first.additionalTextEdits![0].range.start.character, 20);
				assert.equal(first.additionalTextEdits![0].range.end.line, 2);
				assert.equal(first.additionalTextEdits![0].range.end.character, 20);
			});
		});
	});

	test('"TypeError: e.onCancellationRequested is not a function" calling hover provider in Insiders #54174', function () {

		disposables.push(extHost.registerHoverProvider(nullExtensionDescription, defaultSelector, <vscode.HoverProvider>{
			provideHover(): any {
				return new types.Hover('fofofofo');
			}
		}));

		return rpcProtocol.sync().then(() => {
			return commands.executeCommand<vscode.Hover[]>('vscode.executeHoverProvider', model.uri, new types.Position(1, 1)).then(value => {
				assert.equal(value.length, 1);
				assert.equal(value[0].contents.length, 1);
			});
		});
	});

	// --- selection ranges

	test('Selection Range, back and forth', async function () {

		disposables.push(extHost.registerSelectionRangeProvider(nullExtensionDescription, defaultSelector, <vscode.SelectionRangeProvider>{
			provideSelectionRanges() {
				return [
					new types.SelectionRange(new types.Range(0, 10, 0, 18), new types.SelectionRange(new types.Range(0, 2, 0, 20))),
				];
			}
		}));

		await rpcProtocol.sync();
		let value = await commands.executeCommand<vscode.SelectionRange[][]>('vscode.executeSelectionRangeProvider', model.uri, [new types.Position(0, 10)]);
		assert.equal(value.length, 1);
		assert.ok(value[0].length >= 2);
	});

});
