import BaseApplication, { shouldPreserveSelectedNoteOnSmartFilterSelect } from '@joplin/lib/BaseApplication';
import ItemChange from '@joplin/lib/models/ItemChange';
import Note from '@joplin/lib/models/Note';
import reducer, { defaultState, defaultWindowId, State } from '@joplin/lib/reducer';
import { ALL_NOTES_FILTER_ID } from '@joplin/lib/reserved-ids';
import { NoteEntity } from '@joplin/lib/services/database/types';
import ExternalEditWatcher from '@joplin/lib/services/ExternalEditWatcher';
import { setEncryptionEnabled } from '@joplin/lib/services/synchronizer/syncInfoUtils';
import { loadEncryptionMasterKey, setupDatabaseAndSynchronizer, switchClient } from '@joplin/lib/testing/test-utils';
import waitFor from '@joplin/lib/testing/waitFor';
import AsyncActionQueue from '@joplin/lib/AsyncActionQueue';
import { appendFile, readFile } from 'fs/promises';
import { TextEncoder as NodeTextEncoder } from 'util';
import app from './app';

type NoteUpdateAction = {
	changeSource: number;
	changedFields: string[];
	note: NoteEntity;
	[key: string]: unknown;
};

const mockBaseMiddleware = () => {
	return jest.spyOn(BaseApplication.prototype as unknown as {
		generalMiddleware: (store: unknown, next: (action: unknown)=> unknown, action: unknown)=> Promise<unknown>;
	}, 'generalMiddleware').mockImplementation(async (_store, next, action) => next(action));
};

const createDesktopActionHandler = (watchedNoteFiles: string[] = []) => {
	const middleware = app().generalMiddlewareFn()({ getState: () => ({ watchedNoteFiles }) });
	return middleware(jest.fn());
};

describe('app', () => {
	const watcher = ExternalEditWatcher.instance();
	const originalTextEncoder = globalThis.TextEncoder;
	const originalNoteDispatch = Note.dispatch;
	let baseMiddlewareMock: jest.SpyInstance;

	test.each([
		['regular', { deleted_time: 0, is_conflict: 0 }, true],
		['trashed', { deleted_time: 1, is_conflict: 0 }, false],
		['conflict', { deleted_time: 0, is_conflict: 1 }, false],
	])('should determine whether to preserve a %s note when selecting all notes', (_noteType, noteProperties, expected) => {
		watcher.initialize(jest.fn(), jest.fn());
		const note = { id: 'note-id', ...noteProperties } as NoteEntity;
		const state = { ...defaultState, notes: [note], selectedNoteIds: [note.id] };

		expect(shouldPreserveSelectedNoteOnSmartFilterSelect(state, ALL_NOTES_FILTER_ID)).toBe(expected);
	});

	test('should not apply a note refresh after the active window changes', async () => {
		const secondaryState = {
			...defaultState,
			windowId: 'secondary-window',
			notesParentType: 'Folder',
			selectedFolderId: 'secondary-folder',
			selectedNoteIds: ['secondary-note'],
		} as State;
		let activeState = secondaryState;
		const dispatch = jest.fn();
		const storeMock = jest.spyOn(app(), 'store').mockReturnValue({
			dispatch,
			getState: () => activeState,
		} as unknown as ReturnType<ReturnType<typeof app>['store']>);
		const previewsMock = jest.spyOn(Note, 'previews').mockImplementation(async () => {
			activeState = { ...defaultState, windowId: defaultWindowId } as State;
			return [{ id: 'secondary-note' }] as NoteEntity[];
		});

		try {
			await app().refreshNotes(secondaryState, true);
			expect(dispatch).not.toHaveBeenCalled();
		} finally {
			previewsMock.mockRestore();
			storeMock.mockRestore();
		}
	});

	test('should not apply a note refresh after a newer refresh has started', async () => {
		const state = { ...defaultState, notesParentType: 'Folder', selectedFolderId: 'folder' } as State;
		const dispatch = jest.fn();
		const storeMock = jest.spyOn(app(), 'store').mockReturnValue({
			dispatch,
			getState: () => state,
		} as unknown as ReturnType<ReturnType<typeof app>['store']>);
		let resolveSlowPreviews: (notes: NoteEntity[])=> void = null;
		const previewsMock = jest.spyOn(Note, 'previews')
			.mockImplementationOnce(() => new Promise(resolve => { resolveSlowPreviews = resolve; }))
			.mockResolvedValueOnce([{ id: 'fast-note' }]);

		try {
			const slowRefresh = app().refreshNotes(state);
			const fastRefresh = (async () => {
				await app().refreshNotes(state);
				resolveSlowPreviews([{ id: 'slow-note' }]);
			})();
			await Promise.all([slowRefresh, fastRefresh]);

			const noteUpdates = dispatch.mock.calls.map(call => call[0]).filter(action => action.type === 'NOTE_UPDATE_ALL');
			expect(noteUpdates.map(action => action.notes)).toEqual([[{ id: 'fast-note' }]]);
		} finally {
			previewsMock.mockRestore();
			storeMock.mockRestore();
		}
	});

	test('should not let a refresh for an inactive window cancel the active window refresh', async () => {
		const state = { ...defaultState, notesParentType: 'Folder', selectedFolderId: 'folder' } as State;
		const dispatch = jest.fn();
		const storeMock = jest.spyOn(app(), 'store').mockReturnValue({
			dispatch,
			getState: () => state,
		} as unknown as ReturnType<ReturnType<typeof app>['store']>);
		const previewsMock = jest.spyOn(Note, 'previews').mockResolvedValue([]);

		try {
			await Promise.all([app().refreshNotes(state), app().refreshNotes({ ...state, windowId: 'inactive-window' })]);
			expect(dispatch).toHaveBeenCalledWith(expect.objectContaining({ type: 'NOTE_UPDATE_ALL' }));
		} finally {
			previewsMock.mockRestore();
			storeMock.mockRestore();
		}
	});

	test.each([
		['the active window', true, [[expect.objectContaining({ windowId: defaultWindowId }), false, '']]],
		['a background window', false, []],
	])('should only refresh notes when the active window is closed (closing %s)', async (_name, focusSecondaryWindow, expectedRefreshCalls) => {
		let state = reducer(defaultState, { type: 'WINDOW_OPEN', windowId: 'secondary-window', folderId: 'folder', noteId: 'note' });
		if (focusSecondaryWindow) state = reducer(state, { type: 'WINDOW_FOCUS', windowId: 'secondary-window' });
		const store = { getState: () => state, dispatch: jest.fn() };
		const next = (action: unknown) => { state = reducer(state, action); };
		const refreshNotesMock = jest.spyOn(app(), 'refreshNotes').mockResolvedValue(undefined);
		baseMiddlewareMock.mockRestore();

		try {
			await (BaseApplication.prototype as unknown as {
				generalMiddleware: (store: unknown, next: (action: unknown)=> unknown, action: unknown)=> Promise<unknown>;
			}).generalMiddleware.call(app(), store, next, { type: 'WINDOW_CLOSE', windowId: 'secondary-window' });
			expect(refreshNotesMock.mock.calls).toEqual(expectedRefreshCalls);
		} finally {
			refreshNotesMock.mockRestore();
		}
	});

	beforeEach(async () => {
		await setupDatabaseAndSynchronizer(0);
		await switchClient(0);
		baseMiddlewareMock = mockBaseMiddleware();
	});

	afterEach(async () => {
		Note.dispatch = originalNoteDispatch;
		baseMiddlewareMock.mockRestore();
		setEncryptionEnabled(false);
		Object.defineProperty(globalThis, 'TextEncoder', { configurable: true, value: originalTextEncoder });
		await watcher.stopWatchingAll();
	});

	const startExternalEditing = async () => {
		const openItem = jest.fn();
		watcher.initialize(jest.fn(() => ({
			openItem,
		})), jest.fn());

		const originalNote = await Note.save({
			title: 'Test note',
			body: 'Original body',
		});
		await watcher.openAndWatch(originalNote);

		return {
			originalNote,
			externalFilePath: openItem.mock.calls[0][0] as string,
		};
	};

	test('should update the external edit file after a synced note changes', async () => {
		const { originalNote, externalFilePath } = await startExternalEditing();
		const syncedNote = await Note.save({
			...originalNote,
			body: 'Changed on another device',
		}, { changeSource: ItemChange.SOURCE_SYNC });
		const syncedUpdateAction = {
			type: 'NOTE_UPDATE_ONE',
			changeSource: ItemChange.SOURCE_SYNC,
			changedFields: ['body'],
			note: syncedNote,
		};

		const handleDesktopAction = createDesktopActionHandler();
		await handleDesktopAction(syncedUpdateAction);

		expect(await readFile(externalFilePath, 'utf8')).toBe(await Note.serializeForEdit(syncedNote));
	});

	test('should not update the external edit file when the note is not watched', async () => {
		const note = await Note.save({
			title: 'Test note',
			body: 'Changed on another device',
		}, { changeSource: ItemChange.SOURCE_SYNC });
		const updateNoteFile = jest.spyOn(watcher, 'updateNoteFile');

		const handleDesktopAction = createDesktopActionHandler();
		await handleDesktopAction({
			type: 'NOTE_UPDATE_ONE',
			changeSource: ItemChange.SOURCE_SYNC,
			changedFields: ['body'],
			note,
		});

		expect(watcher.noteIsWatched(note)).toBe(false);
		expect(updateNoteFile).not.toHaveBeenCalled();
		updateNoteFile.mockRestore();
	});

	test('should not update the external edit file when the synced note is locked', async () => {
		const { originalNote } = await startExternalEditing();
		const updateNoteFile = jest.spyOn(watcher, 'updateNoteFile');

		const handleDesktopAction = createDesktopActionHandler();
		await handleDesktopAction({
			type: 'NOTE_UPDATE_ONE',
			changeSource: ItemChange.SOURCE_SYNC,
			changedFields: ['body', 'is_locked'],
			note: { ...originalNote, body: 'Locked note ciphertext', is_locked: 1 },
		});

		expect(updateNoteFile).not.toHaveBeenCalled();
		updateNoteFile.mockRestore();
	});

	test('should drop pending external edits when a synced note arrives locked', async () => {
		const { originalNote, externalFilePath } = await startExternalEditing();
		const lockedNote = await Note.save({
			...originalNote,
			body: 'Locked note ciphertext',
			is_locked: 1,
		}, { changeSource: ItemChange.SOURCE_SYNC });

		await appendFile(externalFilePath, ' (plaintext edit)');
		const changeEventQueue = (watcher as unknown as { changeEventQueue_: AsyncActionQueue<unknown> }).changeEventQueue_;
		await waitFor(() => {
			expect(changeEventQueue.isEmpty).toBe(false);
		});

		const handleDesktopAction = createDesktopActionHandler([originalNote.id]);
		await handleDesktopAction({
			type: 'NOTE_UPDATE_ONE',
			changeSource: ItemChange.SOURCE_SYNC,
			changedFields: ['body', 'is_locked'],
			note: lockedNote,
		});
		await changeEventQueue.waitForAllDone();

		expect(watcher.noteIsWatched(originalNote)).toBe(false);
		expect((await Note.load(originalNote.id)).body).toBe('Locked note ciphertext');
	});

	test('should wait for a synced encrypted note to be decrypted before updating the external edit file', async () => {
		const { originalNote, externalFilePath } = await startExternalEditing();
		const noteActions = jest.fn();
		Note.dispatch = noteActions;

		Object.defineProperty(globalThis, 'TextEncoder', { configurable: true, value: NodeTextEncoder });
		setEncryptionEnabled(true);
		await loadEncryptionMasterKey();

		const encryptedSyncPayload = await Note.serializeForSync({
			...originalNote,
			body: 'Changed on another device',
		} as NoteEntity);
		const encryptedNote = Note.filter(await Note.unserialize(encryptedSyncPayload));
		const savedEncryptedNote = await Note.save(encryptedNote, {
			autoTimestamp: false,
			changeSource: ItemChange.SOURCE_SYNC,
			oldItem: originalNote as unknown as Record<string, unknown>,
		});
		const encryptedSyncAction = noteActions.mock.calls[0][0] as NoteUpdateAction;

		expect(encryptedSyncAction.note.encryption_applied).toBe(1);

		const handleDesktopAction = createDesktopActionHandler();
		await handleDesktopAction(encryptedSyncAction);

		expect(await readFile(externalFilePath, 'utf8')).toBe(await Note.serializeForEdit(originalNote));

		noteActions.mockClear();
		const decryptedNote = await Note.decrypt(savedEncryptedNote);
		const decryptedUpdateActions = noteActions.mock.calls
			.map(call => call[0] as NoteUpdateAction)
			.filter(action => action.type === 'NOTE_UPDATE_ONE');
		expect(decryptedUpdateActions).toHaveLength(1);
		const decryptedAction = decryptedUpdateActions[0];

		expect(decryptedAction.note).toEqual(decryptedNote);
		expect(decryptedAction.note.body).toBe('Changed on another device');
		expect(decryptedAction.note.encryption_applied).toBe(0);
		expect(decryptedAction.changedFields).toEqual(expect.arrayContaining(['body', 'encryption_applied']));

		await handleDesktopAction(decryptedAction);

		expect(await readFile(externalFilePath, 'utf8')).toBe(await Note.serializeForEdit(decryptedNote));
	});
});