import Setting from '../../models/Setting';
import { afterAllCleanUp, encryptionService, fileContentEqual, setupDatabaseAndSynchronizer, supportDir, switchClient } from '../../testing/test-utils';
import EncryptionService, { EncryptionMethod } from '../e2ee/EncryptionService';
import { localSyncInfo, saveLocalSyncInfo } from '../synchronizer/syncInfoUtils';
import NoteLockKey from './NoteLockKey';
import NoteLockSession from './NoteLockSession';
import NoteLockService, { ScopedNoteLockService } from './NoteLockService';

const unlockedSession = async (password = '123456') => {
	const session = NoteLockSession.instance();
	await NoteLockKey.instance().create(password);
	await session.unlock(password);
	return session;
};

const changeSyncedKeyId = (id: string) => {
	const syncInfo = localSyncInfo();
	syncInfo.noteLockKey = { ...syncInfo.noteLockKey, id };
	saveLocalSyncInfo(syncInfo);
};

describe('NoteLockService', () => {

	beforeEach(async () => {
		await setupDatabaseAndSynchronizer(1);
		await switchClient(1);
		NoteLockService.destroyInstance();
		NoteLockSession.destroyInstance();
		NoteLockKey.destroyInstance();
		EncryptionService.instance_ = encryptionService();
	});

	afterAll(async () => {
		await afterAllCleanUp();
	});

	it('should encrypt and decrypt strings and files without loading an E2EE master key', async () => {
		const encryptionServiceInstance = EncryptionService.instance();
		const noteLockKey = NoteLockKey.instance();
		const session = NoteLockSession.instance();
		const service = NoteLockService.instance();
		await noteLockKey.create('123456');
		await session.unlock('123456');

		const cipherText = await service.encryptString('some secret');
		// Note lock data carries its own header prefix so a JED prefix check cannot mistake it
		// for sync E2EE data.
		expect(cipherText.startsWith('JLD01')).toBe(true);
		expect(await service.decryptString(cipherText)).toBe('some secret');

		const sourcePath = `${supportDir}/photo.jpg`;
		const encryptedPath = `${Setting.value('tempDir')}/note-lock-photo.crypted`;
		const decryptedPath = `${Setting.value('tempDir')}/note-lock-photo.jpg`;
		await service.encryptFile(sourcePath, encryptedPath);
		await service.decryptFile(encryptedPath, decryptedPath);

		expect(fileContentEqual(sourcePath, encryptedPath)).toBe(false);
		expect(fileContentEqual(sourcePath, decryptedPath)).toBe(true);
		expect(encryptionServiceInstance.loadedMasterKeysCount()).toBe(0);
	});

	it('should refuse to run a held operation while the session is locked', async () => {
		await NoteLockKey.instance().create('123456');
		await expect(NoteLockService.withDecryptedKey(async () => {})).rejects.toThrow('Note lock session is locked');
	});

	it('should change the note lock password without rotating the key', async () => {
		const noteLockKey = NoteLockKey.instance();
		const session = NoteLockSession.instance();
		const service = NoteLockService.instance();
		const firstKey = await noteLockKey.create('123456');
		await session.unlock('123456');
		const cipherText = await service.encryptString('some secret');

		const changedKey = await noteLockKey.changePassword('123456', '654321');
		expect(changedKey.id).toBe(firstKey.id);
		expect(changedKey.content).not.toBe(firstKey.content);
		// Same key id and decrypted content, so an already-unlocked session keeps working.
		expect(session.isUnlocked()).toBe(true);
		expect(await service.decryptString(cipherText)).toBe('some secret');

		session.lock();
		await expect(session.unlock('123456')).rejects.toThrow();
		await session.unlock('654321');
		expect(await service.decryptString(cipherText)).toBe('some secret');
	});

	it('should upgrade the note lock key without rotating it', async () => {
		const noteLockKey = NoteLockKey.instance();
		const session = NoteLockSession.instance();
		const service = NoteLockService.instance();
		const oldKey = noteLockKey.save(await EncryptionService.instance().generateMasterKey('123456', {
			encryptionMethod: EncryptionMethod.SJCL2,
		}));
		await session.unlock('123456');
		const cipherText = await service.encryptString('some secret');

		expect(noteLockKey.needsUpgrade()).toBe(true);
		const upgradedKey = await noteLockKey.upgrade('123456');

		expect(upgradedKey.id).toBe(oldKey.id);
		expect(upgradedKey.content).not.toBe(oldKey.content);
		expect(noteLockKey.needsUpgrade()).toBe(false);
		expect(await service.decryptString(cipherText)).toBe('some secret');
	});

	it('should keep a held operation working after the session locks, refuse the session-backed service, and revoke the scoped service afterwards', async () => {
		const service = NoteLockService.instance();
		const session = await unlockedSession();
		const cipherText = await service.encryptString('some secret');

		let escaped: ScopedNoteLockService = null;
		await NoteLockService.withDecryptedKey(async scoped => {
			escaped = scoped;
			session.lock();
			await expect(service.decryptString(cipherText)).rejects.toThrow('Note lock session is locked');
			expect(await scoped.decryptString(cipherText)).toBe('some secret');
			const lockedEncryptedText = await scoped.encryptString('encrypted while locked');
			expect(await scoped.decryptString(lockedEncryptedText)).toBe('encrypted while locked');
		});

		await expect(service.decryptString(cipherText)).rejects.toThrow('Note lock session is locked');
		await expect(escaped.decryptString(cipherText)).rejects.toThrow('Note lock operation key is no longer available');
	});

	it('should keep a held operation on its captured key when the synced key changes, and fail the session-backed service closed', async () => {
		const service = NoteLockService.instance();
		await unlockedSession();
		const cipherText = await service.encryptString('some secret');

		await NoteLockService.withDecryptedKey(async scoped => {
			changeSyncedKeyId('0123456789abcdef0123456789abcdef');

			expect(await scoped.decryptString(cipherText)).toBe('some secret');
			await expect(service.encryptString('unrelated')).rejects.toThrow('Note lock session is locked');
			await expect(scoped.encryptString('unrelated')).rejects.toThrow('Note lock key changed during operation');
		});
	});

	it('should fail a held encrypt closed while a reset is in progress', async () => {
		const session = await unlockedSession();

		await NoteLockService.withDecryptedKey(async scoped => {
			// Don't await yet: reset() sets the rotating flag synchronously before its first await, which is
			// what the held encrypt below needs to observe.
			const resetting = session.reset('654321');
			await expect(scoped.encryptString('some secret')).rejects.toThrow('Note lock key changed during operation');
			await resetting;
		});
	});

	it('should fail a held encryptFile closed and remove its output if the key rotates mid-encrypt', async () => {
		await unlockedSession();

		const sourcePath = `${supportDir}/photo.jpg`;
		const destPath = `${Setting.value('tempDir')}/note-lock-rotate-mid-encrypt.crypted`;
		const fsDriver = EncryptionService.instance().fsDriver();

		await NoteLockService.withDecryptedKey(async scoped => {
			// Don't await yet: encryptFile() doesn't reach its own first await until after the pre-check, so
			// this mutation is guaranteed to land before the post-check below runs.
			const encrypting = scoped.encryptFile(sourcePath, destPath);
			changeSyncedKeyId('0123456789abcdef0123456789abcdef');
			await expect(encrypting).rejects.toThrow('Note lock key changed during operation');
		});

		expect(await fsDriver.exists(destPath)).toBe(false);
	});

	it('should fail the live service closed and remove its output if the key rotates mid-encrypt', async () => {
		await unlockedSession();
		const service = NoteLockService.instance();

		const sourcePath = `${supportDir}/photo.jpg`;
		const destPath = `${Setting.value('tempDir')}/note-lock-rotate-mid-encrypt-live.crypted`;
		const fsDriver = EncryptionService.instance().fsDriver();

		// Don't await yet: encryptFile() doesn't reach its own first await until after the pre-check, so this
		// mutation is guaranteed to land before the post-check below runs.
		const encrypting = service.encryptFile(sourcePath, destPath);
		changeSyncedKeyId('0123456789abcdef0123456789abcdef');
		await expect(encrypting).rejects.toThrow('Note lock key changed during operation');

		expect(await fsDriver.exists(destPath)).toBe(false);
	});

	it('should propagate errors from a held operation and still revoke the scoped service', async () => {
		const session = NoteLockSession.instance();
		await NoteLockKey.instance().create('123456');
		await session.unlock('123456');

		let escaped: ScopedNoteLockService = null;
		await expect(NoteLockService.withDecryptedKey(async scoped => {
			escaped = scoped;
			throw new Error('boom');
		})).rejects.toThrow('boom');

		await expect(escaped.decryptString('does not matter')).rejects.toThrow('Note lock operation key is no longer available');
	});

	it('should not overwrite a key that arrives through sync while create is generating', async () => {
		const encryptionServiceInstance = EncryptionService.instance();
		const realGenerate = encryptionServiceInstance.generateMasterKey.bind(encryptionServiceInstance);
		const spy = jest.spyOn(encryptionServiceInstance, 'generateMasterKey').mockImplementation(async (password: string) => {
			const generated = await realGenerate(password);
			const syncInfo = localSyncInfo();
			syncInfo.noteLockKey = { id: 'synced-key' };
			saveLocalSyncInfo(syncInfo);
			return generated;
		});

		try {
			await expect(NoteLockKey.instance().create('123456')).rejects.toThrow('Note lock key already exists');
			expect(NoteLockKey.instance().load().id).toBe('synced-key');
		} finally {
			spy.mockRestore();
		}
	});
});