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

import * as assert from 'assert';
import * as platform from 'vs/base/common/platform';
import * as fs from 'fs';
import * as os from 'os';
import * as path from 'vs/base/common/path';
import * as pfs from 'vs/base/node/pfs';
import { URI as Uri, URI } from 'vs/base/common/uri';
import { EnvironmentService } from 'vs/platform/environment/node/environmentService';
import { parseArgs } from 'vs/platform/environment/node/argv';
import { BackupMainService } from 'vs/platform/backup/electron-main/backupMainService';
import { IBackupWorkspacesFormat, ISerializedWorkspace } from 'vs/platform/backup/common/backup';
import { HotExitConfiguration } from 'vs/platform/files/common/files';
import { TestConfigurationService } from 'vs/platform/configuration/test/common/testConfigurationService';
import { ConsoleLogMainService } from 'vs/platform/log/common/log';
import { IWorkspaceIdentifier } from 'vs/platform/workspaces/common/workspaces';
import { createHash } from 'crypto';
import { getRandomTestPath } from 'vs/workbench/test/workbenchTestServices';
import { Schemas } from 'vs/base/common/network';

suite('BackupMainService', () => {

	function assertEqualUris(actual: Uri[], expected: Uri[]) {
		assert.deepEqual(actual.map(a => a.toString()), expected.map(a => a.toString()));
	}

	const parentDir = getRandomTestPath(os.tmpdir(), 'vsctests', 'backupservice');
	const backupHome = path.join(parentDir, 'Backups');
	const backupWorkspacesPath = path.join(backupHome, 'workspaces.json');

	const environmentService = new EnvironmentService(parseArgs(process.argv), process.execPath);

	class TestBackupMainService extends BackupMainService {

		constructor(backupHome: string, backupWorkspacesPath: string, configService: TestConfigurationService) {
			super(environmentService, configService, new ConsoleLogMainService());

			this.backupHome = backupHome;
			this.workspacesJsonPath = backupWorkspacesPath;
		}

		public toBackupPath(arg: Uri | string): string {
			const id = arg instanceof Uri ? super.getFolderHash(arg) : arg;
			return path.join(this.backupHome, id);
		}

		public getFolderHash(folderUri: Uri): string {
			return super.getFolderHash(folderUri);
		}

		public toLegacyBackupPath(folderPath: string): string {
			return path.join(this.backupHome, super.getLegacyFolderHash(folderPath));
		}
	}

	function toWorkspace(path: string): IWorkspaceIdentifier {
		return {
			id: createHash('md5').update(sanitizePath(path)).digest('hex'),
			configPath: URI.file(path)
		};
	}

	function toSerializedWorkspace(ws: IWorkspaceIdentifier): ISerializedWorkspace {
		return {
			id: ws.id,
			configURIPath: ws.configPath.toString()
		};
	}

	async function ensureFolderExists(uri: Uri): Promise<void> {
		if (!fs.existsSync(uri.fsPath)) {
			fs.mkdirSync(uri.fsPath);
		}
		const backupFolder = service.toBackupPath(uri);
		await createBackupFolder(backupFolder);
	}

	async function ensureWorkspaceExists(workspace: IWorkspaceIdentifier): Promise<IWorkspaceIdentifier> {
		if (!fs.existsSync(workspace.configPath.fsPath)) {
			await pfs.writeFile(workspace.configPath.fsPath, 'Hello');
		}
		const backupFolder = service.toBackupPath(workspace.id);
		await createBackupFolder(backupFolder);
		return workspace;
	}

	async function createBackupFolder(backupFolder: string): Promise<void> {
		if (!fs.existsSync(backupFolder)) {
			fs.mkdirSync(backupFolder);
			fs.mkdirSync(path.join(backupFolder, Schemas.file));
			await pfs.writeFile(path.join(backupFolder, Schemas.file, 'foo.txt'), 'Hello');
		}
	}

	function sanitizePath(p: string): string {
		return platform.isLinux ? p : p.toLowerCase();
	}

	const fooFile = Uri.file(platform.isWindows ? 'C:\\foo' : '/foo');
	const barFile = Uri.file(platform.isWindows ? 'C:\\bar' : '/bar');

	const existingTestFolder1 = Uri.file(path.join(parentDir, 'folder1'));

	let service: TestBackupMainService;
	let configService: TestConfigurationService;

	setup(() => {

		// Delete any existing backups completely and then re-create it.
		return pfs.del(backupHome, os.tmpdir()).then(() => {
			return pfs.mkdirp(backupHome);
		}).then(() => {
			configService = new TestConfigurationService();
			service = new TestBackupMainService(backupHome, backupWorkspacesPath, configService);

			return service.initialize();
		});
	});

	teardown(() => {
		return pfs.del(backupHome, os.tmpdir());
	});

	test('service validates backup workspaces on startup and cleans up (folder workspaces)', async function () {
		this.timeout(1000 * 10); // increase timeout for this test

		// 1) backup workspace path does not exist
		service.registerFolderBackupSync(fooFile);
		service.registerFolderBackupSync(barFile);
		await service.initialize();
		assertEqualUris(service.getFolderBackupPaths(), []);

		// 2) backup workspace path exists with empty contents within
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		service.registerFolderBackupSync(fooFile);
		service.registerFolderBackupSync(barFile);
		await service.initialize();
		assertEqualUris(service.getFolderBackupPaths(), []);
		assert.ok(!fs.existsSync(service.toBackupPath(fooFile)));
		assert.ok(!fs.existsSync(service.toBackupPath(barFile)));

		// 3) backup workspace path exists with empty folders within
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		fs.mkdirSync(path.join(service.toBackupPath(fooFile), Schemas.file));
		fs.mkdirSync(path.join(service.toBackupPath(barFile), Schemas.untitled));
		service.registerFolderBackupSync(fooFile);
		service.registerFolderBackupSync(barFile);
		await service.initialize();
		assertEqualUris(service.getFolderBackupPaths(), []);
		assert.ok(!fs.existsSync(service.toBackupPath(fooFile)));
		assert.ok(!fs.existsSync(service.toBackupPath(barFile)));

		// 4) backup workspace path points to a workspace that no longer exists
		// so it should convert the backup worspace to an empty workspace backup
		const fileBackups = path.join(service.toBackupPath(fooFile), Schemas.file);
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		fs.mkdirSync(fileBackups);
		service.registerFolderBackupSync(fooFile);
		assert.equal(service.getFolderBackupPaths().length, 1);
		assert.equal(service.getEmptyWindowBackupPaths().length, 0);
		fs.writeFileSync(path.join(fileBackups, 'backup.txt'), '');
		await service.initialize();
		assert.equal(service.getFolderBackupPaths().length, 0);
		assert.equal(service.getEmptyWindowBackupPaths().length, 1);
	});

	test('service validates backup workspaces on startup and cleans up (root workspaces)', async function () {
		this.timeout(1000 * 10); // increase timeout for this test

		// 1) backup workspace path does not exist
		service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath));
		service.registerWorkspaceBackupSync(toWorkspace(barFile.fsPath));
		await service.initialize();
		assert.deepEqual(service.getWorkspaceBackups(), []);

		// 2) backup workspace path exists with empty contents within
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath));
		service.registerWorkspaceBackupSync(toWorkspace(barFile.fsPath));
		await service.initialize();
		assert.deepEqual(service.getWorkspaceBackups(), []);
		assert.ok(!fs.existsSync(service.toBackupPath(fooFile)));
		assert.ok(!fs.existsSync(service.toBackupPath(barFile)));

		// 3) backup workspace path exists with empty folders within
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		fs.mkdirSync(path.join(service.toBackupPath(fooFile), Schemas.file));
		fs.mkdirSync(path.join(service.toBackupPath(barFile), Schemas.untitled));
		service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath));
		service.registerWorkspaceBackupSync(toWorkspace(barFile.fsPath));
		await service.initialize();
		assert.deepEqual(service.getWorkspaceBackups(), []);
		assert.ok(!fs.existsSync(service.toBackupPath(fooFile)));
		assert.ok(!fs.existsSync(service.toBackupPath(barFile)));

		// 4) backup workspace path points to a workspace that no longer exists
		// so it should convert the backup worspace to an empty workspace backup
		const fileBackups = path.join(service.toBackupPath(fooFile), Schemas.file);
		fs.mkdirSync(service.toBackupPath(fooFile));
		fs.mkdirSync(service.toBackupPath(barFile));
		fs.mkdirSync(fileBackups);
		service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath));
		assert.equal(service.getWorkspaceBackups().length, 1);
		assert.equal(service.getEmptyWindowBackupPaths().length, 0);
		fs.writeFileSync(path.join(fileBackups, 'backup.txt'), '');
		await service.initialize();
		assert.equal(service.getWorkspaceBackups().length, 0);
		assert.equal(service.getEmptyWindowBackupPaths().length, 1);
	});

	test('service supports to migrate backup data from another location', () => {
		const backupPathToMigrate = service.toBackupPath(fooFile);
		fs.mkdirSync(backupPathToMigrate);
		fs.writeFileSync(path.join(backupPathToMigrate, 'backup.txt'), 'Some Data');
		service.registerFolderBackupSync(Uri.file(backupPathToMigrate));

		const workspaceBackupPath = service.registerWorkspaceBackupSync(toWorkspace(barFile.fsPath), backupPathToMigrate);

		assert.ok(fs.existsSync(workspaceBackupPath));
		assert.ok(fs.existsSync(path.join(workspaceBackupPath, 'backup.txt')));
		assert.ok(!fs.existsSync(backupPathToMigrate));

		const emptyBackups = service.getEmptyWindowBackupPaths();
		assert.equal(0, emptyBackups.length);
	});

	test('service backup migration makes sure to preserve existing backups', () => {
		const backupPathToMigrate = service.toBackupPath(fooFile);
		fs.mkdirSync(backupPathToMigrate);
		fs.writeFileSync(path.join(backupPathToMigrate, 'backup.txt'), 'Some Data');
		service.registerFolderBackupSync(Uri.file(backupPathToMigrate));

		const backupPathToPreserve = service.toBackupPath(barFile);
		fs.mkdirSync(backupPathToPreserve);
		fs.writeFileSync(path.join(backupPathToPreserve, 'backup.txt'), 'Some Data');
		service.registerFolderBackupSync(Uri.file(backupPathToPreserve));

		const workspaceBackupPath = service.registerWorkspaceBackupSync(toWorkspace(barFile.fsPath), backupPathToMigrate);

		assert.ok(fs.existsSync(workspaceBackupPath));
		assert.ok(fs.existsSync(path.join(workspaceBackupPath, 'backup.txt')));
		assert.ok(!fs.existsSync(backupPathToMigrate));

		const emptyBackups = service.getEmptyWindowBackupPaths();
		assert.equal(1, emptyBackups.length);
		assert.equal(1, fs.readdirSync(path.join(backupHome, emptyBackups[0].backupFolder)).length);
	});

	suite('migrate path to URI', () => {

		test('migration folder path to URI makes sure to preserve existing backups', async () => {
			let path1 = path.join(parentDir, 'folder1');
			let path2 = path.join(parentDir, 'FOLDER2');
			let uri1 = Uri.file(path1);
			let uri2 = Uri.file(path2);

			if (!fs.existsSync(path1)) {
				fs.mkdirSync(path1);
			}
			if (!fs.existsSync(path2)) {
				fs.mkdirSync(path2);
			}
			const backupFolder1 = service.toLegacyBackupPath(path1);
			if (!fs.existsSync(backupFolder1)) {
				fs.mkdirSync(backupFolder1);
				fs.mkdirSync(path.join(backupFolder1, Schemas.file));
				await pfs.writeFile(path.join(backupFolder1, Schemas.file, 'unsaved1.txt'), 'Legacy');
			}
			const backupFolder2 = service.toLegacyBackupPath(path2);
			if (!fs.existsSync(backupFolder2)) {
				fs.mkdirSync(backupFolder2);
				fs.mkdirSync(path.join(backupFolder2, Schemas.file));
				await pfs.writeFile(path.join(backupFolder2, Schemas.file, 'unsaved2.txt'), 'Legacy');
			}

			const workspacesJson = { rootWorkspaces: [], folderWorkspaces: [path1, path2], emptyWorkspaces: [] };
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();
			const content = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = (<IBackupWorkspacesFormat>JSON.parse(content));
			assert.deepEqual(json.folderURIWorkspaces, [uri1.toString(), uri2.toString()]);
			const newBackupFolder1 = service.toBackupPath(uri1);
			assert.ok(fs.existsSync(path.join(newBackupFolder1, Schemas.file, 'unsaved1.txt')));
			const newBackupFolder2 = service.toBackupPath(uri2);
			assert.ok(fs.existsSync(path.join(newBackupFolder2, Schemas.file, 'unsaved2.txt')));
		});

		test('migrate storage file', async () => {
			let folderPath = path.join(parentDir, 'f1');
			ensureFolderExists(URI.file(folderPath));
			const backupFolderPath = service.toLegacyBackupPath(folderPath);
			await createBackupFolder(backupFolderPath);

			let workspacePath = path.join(parentDir, 'f2.code-workspace');
			const workspace = toWorkspace(workspacePath);
			await ensureWorkspaceExists(workspace);

			const workspacesJson = { rootWorkspaces: [{ id: workspace.id, configPath: workspacePath }], folderWorkspaces: [folderPath], emptyWorkspaces: [] };
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();
			const content = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = (<IBackupWorkspacesFormat>JSON.parse(content));
			assert.deepEqual(json.folderURIWorkspaces, [URI.file(folderPath).toString()]);
			assert.deepEqual(json.rootURIWorkspaces, [{ id: workspace.id, configURIPath: URI.file(workspacePath).toString() }]);

			assertEqualUris(service.getWorkspaceBackups().map(w => w.configPath), [workspace.configPath]);
		});
	});


	suite('loadSync', () => {
		test('getFolderBackupPaths() should return [] when workspaces.json doesn\'t exist', () => {
			assertEqualUris(service.getFolderBackupPaths(), []);
		});

		test('getFolderBackupPaths() should return [] when workspaces.json is not properly formed JSON', async () => {
			fs.writeFileSync(backupWorkspacesPath, '');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{]');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, 'foo');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
		});

		test('getFolderBackupPaths() should return [] when folderWorkspaces in workspaces.json is absent', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
		});

		test('getFolderBackupPaths() should return [] when folderWorkspaces in workspaces.json is not a string array', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":{}}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":{"foo": ["bar"]}}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":{"foo": []}}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":{"foo": "bar"}}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":"foo"}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"folderWorkspaces":1}');
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
		});

		test('getFolderBackupPaths() should return [] when files.hotExit = "onExitAndWindowClose"', async () => {
			service.registerFolderBackupSync(Uri.file(fooFile.fsPath.toUpperCase()));
			assertEqualUris(service.getFolderBackupPaths(), [Uri.file(fooFile.fsPath.toUpperCase())]);
			configService.setUserConfiguration('files.hotExit', HotExitConfiguration.ON_EXIT_AND_WINDOW_CLOSE);
			await service.initialize();
			assertEqualUris(service.getFolderBackupPaths(), []);
		});

		test('getWorkspaceBackups() should return [] when workspaces.json doesn\'t exist', () => {
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getWorkspaceBackups() should return [] when workspaces.json is not properly formed JSON', async () => {
			fs.writeFileSync(backupWorkspacesPath, '');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{]');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, 'foo');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getWorkspaceBackups() should return [] when folderWorkspaces in workspaces.json is absent', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getWorkspaceBackups() should return [] when rootWorkspaces in workspaces.json is not a object array', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":{}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":{"foo": ["bar"]}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":{"foo": []}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":{"foo": "bar"}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":"foo"}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootWorkspaces":1}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getWorkspaceBackups() should return [] when rootURIWorkspaces in workspaces.json is not a object array', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":{}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":{"foo": ["bar"]}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":{"foo": []}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":{"foo": "bar"}}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":"foo"}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"rootURIWorkspaces":1}');
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getWorkspaceBackups() should return [] when files.hotExit = "onExitAndWindowClose"', async () => {
			const upperFooPath = fooFile.fsPath.toUpperCase();
			service.registerWorkspaceBackupSync(toWorkspace(upperFooPath));
			assert.equal(service.getWorkspaceBackups().length, 1);
			assertEqualUris(service.getWorkspaceBackups().map(r => r.configPath), [URI.file(upperFooPath)]);
			configService.setUserConfiguration('files.hotExit', HotExitConfiguration.ON_EXIT_AND_WINDOW_CLOSE);
			await service.initialize();
			assert.deepEqual(service.getWorkspaceBackups(), []);
		});

		test('getEmptyWorkspaceBackupPaths() should return [] when workspaces.json doesn\'t exist', () => {
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
		});

		test('getEmptyWorkspaceBackupPaths() should return [] when workspaces.json is not properly formed JSON', async () => {
			fs.writeFileSync(backupWorkspacesPath, '');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{]');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, 'foo');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
		});

		test('getEmptyWorkspaceBackupPaths() should return [] when folderWorkspaces in workspaces.json is absent', async () => {
			fs.writeFileSync(backupWorkspacesPath, '{}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
		});

		test('getEmptyWorkspaceBackupPaths() should return [] when folderWorkspaces in workspaces.json is not a string array', async function () {
			this.timeout(5000);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":{}}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":{"foo": ["bar"]}}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":{"foo": []}}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":{"foo": "bar"}}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":"foo"}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
			fs.writeFileSync(backupWorkspacesPath, '{"emptyWorkspaces":1}');
			await service.initialize();
			assert.deepEqual(service.getEmptyWindowBackupPaths(), []);
		});
	});

	suite('dedupeFolderWorkspaces', () => {
		test('should ignore duplicates (folder workspace)', async () => {

			await ensureFolderExists(existingTestFolder1);

			const workspacesJson: IBackupWorkspacesFormat = {
				rootURIWorkspaces: [],
				folderURIWorkspaces: [existingTestFolder1.toString(), existingTestFolder1.toString()],
				emptyWorkspaceInfos: []
			};
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();

			const buffer = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.deepEqual(json.folderURIWorkspaces, [existingTestFolder1.toString()]);
		});

		test('should ignore duplicates on Windows and Mac (folder workspace)', async () => {

			await ensureFolderExists(existingTestFolder1);

			const workspacesJson: IBackupWorkspacesFormat = {
				rootURIWorkspaces: [],
				folderURIWorkspaces: [existingTestFolder1.toString(), existingTestFolder1.toString().toLowerCase()],
				emptyWorkspaceInfos: []
			};
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();
			const buffer = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.deepEqual(json.folderURIWorkspaces, [existingTestFolder1.toString()]);
		});

		test('should ignore duplicates on Windows and Mac (root workspace)', async () => {

			const workspacePath = path.join(parentDir, 'Foo.code-workspace');
			const workspacePath1 = path.join(parentDir, 'FOO.code-workspace');
			const workspacePath2 = path.join(parentDir, 'foo.code-workspace');

			const workspace1 = await ensureWorkspaceExists(toWorkspace(workspacePath));
			const workspace2 = await ensureWorkspaceExists(toWorkspace(workspacePath1));
			const workspace3 = await ensureWorkspaceExists(toWorkspace(workspacePath2));

			const workspacesJson: IBackupWorkspacesFormat = {
				rootURIWorkspaces: [workspace1, workspace2, workspace3].map(toSerializedWorkspace),
				folderURIWorkspaces: [],
				emptyWorkspaceInfos: []
			};
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();

			const buffer = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.equal(json.rootURIWorkspaces.length, platform.isLinux ? 3 : 1);
			if (platform.isLinux) {
				assert.deepEqual(json.rootURIWorkspaces.map(r => r.configURIPath), [URI.file(workspacePath).toString(), URI.file(workspacePath1).toString(), URI.file(workspacePath2).toString()]);
			} else {
				assert.deepEqual(json.rootURIWorkspaces.map(r => r.configURIPath), [URI.file(workspacePath).toString()], 'should return the first duplicated entry');
			}
		});
	});

	suite('registerWindowForBackups', () => {
		test('should persist paths to workspaces.json (folder workspace)', async () => {
			service.registerFolderBackupSync(fooFile);
			service.registerFolderBackupSync(barFile);
			assertEqualUris(service.getFolderBackupPaths(), [fooFile, barFile]);
			const buffer = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.deepEqual(json.folderURIWorkspaces, [fooFile.toString(), barFile.toString()]);
		});

		test('should persist paths to workspaces.json (root workspace)', async () => {
			const ws1 = toWorkspace(fooFile.fsPath);
			service.registerWorkspaceBackupSync(ws1);
			const ws2 = toWorkspace(barFile.fsPath);
			service.registerWorkspaceBackupSync(ws2);

			assertEqualUris(service.getWorkspaceBackups().map(b => b.configPath), [fooFile, barFile]);
			assert.equal(ws1.id, service.getWorkspaceBackups()[0].id);
			assert.equal(ws2.id, service.getWorkspaceBackups()[1].id);

			const buffer = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);

			assert.deepEqual(json.rootURIWorkspaces.map(b => b.configURIPath), [fooFile.toString(), barFile.toString()]);
			assert.equal(ws1.id, json.rootURIWorkspaces[0].id);
			assert.equal(ws2.id, json.rootURIWorkspaces[1].id);
		});
	});

	test('should always store the workspace path in workspaces.json using the case given, regardless of whether the file system is case-sensitive (folder workspace)', () => {
		service.registerFolderBackupSync(Uri.file(fooFile.fsPath.toUpperCase()));
		assertEqualUris(service.getFolderBackupPaths(), [Uri.file(fooFile.fsPath.toUpperCase())]);
		return pfs.readFile(backupWorkspacesPath, 'utf-8').then(buffer => {
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.deepEqual(json.folderURIWorkspaces, [Uri.file(fooFile.fsPath.toUpperCase()).toString()]);
		});
	});

	test('should always store the workspace path in workspaces.json using the case given, regardless of whether the file system is case-sensitive (root workspace)', () => {
		const upperFooPath = fooFile.fsPath.toUpperCase();
		service.registerWorkspaceBackupSync(toWorkspace(upperFooPath));
		assertEqualUris(service.getWorkspaceBackups().map(b => b.configPath), [URI.file(upperFooPath)]);
		return pfs.readFile(backupWorkspacesPath, 'utf-8').then(buffer => {
			const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
			assert.deepEqual(json.rootURIWorkspaces.map(b => b.configURIPath), [URI.file(upperFooPath).toString()]);
		});
	});

	suite('removeBackupPathSync', () => {
		test('should remove folder workspaces from workspaces.json (folder workspace)', () => {
			service.registerFolderBackupSync(fooFile);
			service.registerFolderBackupSync(barFile);
			service.unregisterFolderBackupSync(fooFile);
			return pfs.readFile(backupWorkspacesPath, 'utf-8').then(buffer => {
				const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
				assert.deepEqual(json.folderURIWorkspaces, [barFile.toString()]);
				service.unregisterFolderBackupSync(barFile);
				return pfs.readFile(backupWorkspacesPath, 'utf-8').then(content => {
					const json2 = <IBackupWorkspacesFormat>JSON.parse(content);
					assert.deepEqual(json2.folderURIWorkspaces, []);
				});
			});
		});

		test('should remove folder workspaces from workspaces.json (root workspace)', () => {
			const ws1 = toWorkspace(fooFile.fsPath);
			service.registerWorkspaceBackupSync(ws1);
			const ws2 = toWorkspace(barFile.fsPath);
			service.registerWorkspaceBackupSync(ws2);
			service.unregisterWorkspaceBackupSync(ws1);
			return pfs.readFile(backupWorkspacesPath, 'utf-8').then(buffer => {
				const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
				assert.deepEqual(json.rootURIWorkspaces.map(r => r.configURIPath), [barFile.toString()]);
				service.unregisterWorkspaceBackupSync(ws2);
				return pfs.readFile(backupWorkspacesPath, 'utf-8').then(content => {
					const json2 = <IBackupWorkspacesFormat>JSON.parse(content);
					assert.deepEqual(json2.rootURIWorkspaces, []);
				});
			});
		});

		test('should remove empty workspaces from workspaces.json', () => {
			service.registerEmptyWindowBackupSync({ backupFolder: 'foo' });
			service.registerEmptyWindowBackupSync({ backupFolder: 'bar' });
			service.unregisterEmptyWindowBackupSync('foo');
			return pfs.readFile(backupWorkspacesPath, 'utf-8').then(buffer => {
				const json = <IBackupWorkspacesFormat>JSON.parse(buffer);
				assert.deepEqual(json.emptyWorkspaces, ['bar']);
				service.unregisterEmptyWindowBackupSync('bar');
				return pfs.readFile(backupWorkspacesPath, 'utf-8').then(content => {
					const json2 = <IBackupWorkspacesFormat>JSON.parse(content);
					assert.deepEqual(json2.emptyWorkspaces, []);
				});
			});
		});

		test('should fail gracefully when removing a path that doesn\'t exist', async () => {

			await ensureFolderExists(existingTestFolder1); // make sure backup folder exists, so the folder is not removed on loadSync

			const workspacesJson: IBackupWorkspacesFormat = { rootURIWorkspaces: [], folderURIWorkspaces: [existingTestFolder1.toString()], emptyWorkspaceInfos: [] };
			await pfs.writeFile(backupWorkspacesPath, JSON.stringify(workspacesJson));
			await service.initialize();
			service.unregisterFolderBackupSync(barFile);
			service.unregisterEmptyWindowBackupSync('test');
			const content = await pfs.readFile(backupWorkspacesPath, 'utf-8');
			const json = (<IBackupWorkspacesFormat>JSON.parse(content));
			assert.deepEqual(json.folderURIWorkspaces, [existingTestFolder1.toString()]);
		});
	});

	suite('getWorkspaceHash', () => {

		test('should ignore case on Windows and Mac', () => {
			// Skip test on Linux
			if (platform.isLinux) {
				return;
			}

			if (platform.isMacintosh) {
				assert.equal(service.getFolderHash(Uri.file('/foo')), service.getFolderHash(Uri.file('/FOO')));
			}

			if (platform.isWindows) {
				assert.equal(service.getFolderHash(Uri.file('c:\\foo')), service.getFolderHash(Uri.file('C:\\FOO')));
			}
		});
	});

	suite('mixed path casing', () => {
		test('should handle case insensitive paths properly (registerWindowForBackupsSync) (folder workspace)', () => {
			service.registerFolderBackupSync(fooFile);
			service.registerFolderBackupSync(Uri.file(fooFile.fsPath.toUpperCase()));

			if (platform.isLinux) {
				assert.equal(service.getFolderBackupPaths().length, 2);
			} else {
				assert.equal(service.getFolderBackupPaths().length, 1);
			}
		});

		test('should handle case insensitive paths properly (registerWindowForBackupsSync) (root workspace)', () => {
			service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath));
			service.registerWorkspaceBackupSync(toWorkspace(fooFile.fsPath.toUpperCase()));

			if (platform.isLinux) {
				assert.equal(service.getWorkspaceBackups().length, 2);
			} else {
				assert.equal(service.getWorkspaceBackups().length, 1);
			}
		});

		test('should handle case insensitive paths properly (removeBackupPathSync) (folder workspace)', () => {

			// same case
			service.registerFolderBackupSync(fooFile);
			service.unregisterFolderBackupSync(fooFile);
			assert.equal(service.getFolderBackupPaths().length, 0);

			// mixed case
			service.registerFolderBackupSync(fooFile);
			service.unregisterFolderBackupSync(Uri.file(fooFile.fsPath.toUpperCase()));

			if (platform.isLinux) {
				assert.equal(service.getFolderBackupPaths().length, 1);
			} else {
				assert.equal(service.getFolderBackupPaths().length, 0);
			}
		});
	});
});