import type RudderStack from '@rudderstack/rudder-sdk-node';
import { Telemetry } from '@/telemetry';
import config from '@/config';
import { flushPromises } from './Helpers';
import { PostHogClient } from '@/posthog';
import { mock } from 'jest-mock-extended';
import { InstanceSettings } from 'n8n-core';
import { mockInstance } from '../shared/mocking';

jest.unmock('@/telemetry');
jest.mock('@/posthog');

describe('Telemetry', () => {
	let startPulseSpy: jest.SpyInstance;
	const spyTrack = jest.spyOn(Telemetry.prototype, 'track').mockName('track');

	const mockRudderStack = mock<RudderStack>();
	mockRudderStack.track.mockImplementation(function (_, cb) {
		cb?.();

		return this;
	});

	let telemetry: Telemetry;
	const instanceId = 'Telemetry unit test';
	const testDateTime = new Date('2022-01-01 00:00:00');
	const instanceSettings = mockInstance(InstanceSettings, { instanceId });

	beforeAll(() => {
		// @ts-expect-error Spying on private method
		startPulseSpy = jest.spyOn(Telemetry.prototype, 'startPulse').mockImplementation(() => {});

		jest.useFakeTimers();
		jest.setSystemTime(testDateTime);
		config.set('diagnostics.enabled', true);
		config.set('deployment.type', 'n8n-testing');
	});

	afterAll(async () => {
		jest.clearAllTimers();
		jest.useRealTimers();
		startPulseSpy.mockRestore();
		await telemetry.trackN8nStop();
	});

	beforeEach(async () => {
		spyTrack.mockClear();

		const postHog = new PostHogClient(instanceSettings);
		await postHog.init();

		telemetry = new Telemetry(mock(), postHog, mock(), instanceSettings, mock());
		// @ts-expect-error Assigning to private property
		telemetry.rudderStack = mockRudderStack;
	});

	afterEach(async () => {
		await telemetry.trackN8nStop();
	});

	describe('trackN8nStop', () => {
		test('should call track method', async () => {
			await telemetry.trackN8nStop();
			expect(spyTrack).toHaveBeenCalledTimes(1);
		});
	});

	describe('trackWorkflowExecution', () => {
		beforeEach(() => {
			jest.setSystemTime(testDateTime);
		});

		test('should count executions correctly', async () => {
			const payload = {
				workflow_id: '1',
				is_manual: true,
				success: true,
				error_node_type: 'custom-nodes-base.node-type',
			};

			payload.is_manual = true;
			payload.success = true;
			const execTime1 = fakeJestSystemTime('2022-01-01 12:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = false;
			payload.success = true;
			const execTime2 = fakeJestSystemTime('2022-01-01 13:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = true;
			payload.success = false;
			const execTime3 = fakeJestSystemTime('2022-01-01 14:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = false;
			payload.success = false;
			const execTime4 = fakeJestSystemTime('2022-01-01 15:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);

			const execBuffer = telemetry.getCountsBuffer();

			expect(execBuffer['1'].manual_success?.count).toBe(2);
			expect(execBuffer['1'].manual_success?.first).toEqual(execTime1);
			expect(execBuffer['1'].prod_success?.count).toBe(2);
			expect(execBuffer['1'].prod_success?.first).toEqual(execTime2);
			expect(execBuffer['1'].manual_error?.count).toBe(2);
			expect(execBuffer['1'].manual_error?.first).toEqual(execTime3);
			expect(execBuffer['1'].prod_error?.count).toBe(2);
			expect(execBuffer['1'].prod_error?.first).toEqual(execTime4);
		});

		test('should fire "Workflow execution errored" event for failed executions', async () => {
			const payload = {
				workflow_id: '1',
				is_manual: true,
				success: false,
				error_node_type: 'custom-nodes-base.node-type',
			};

			const execTime1 = fakeJestSystemTime('2022-01-01 12:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			let execBuffer = telemetry.getCountsBuffer();

			// should not fire event for custom nodes
			expect(spyTrack).toHaveBeenCalledTimes(0);
			expect(execBuffer['1'].manual_error?.count).toBe(2);
			expect(execBuffer['1'].manual_error?.first).toEqual(execTime1);

			payload.error_node_type = 'n8n-nodes-base.node-type';
			fakeJestSystemTime('2022-01-01 13:00:00');
			telemetry.trackWorkflowExecution(payload);
			fakeJestSystemTime('2022-01-01 12:30:00');
			telemetry.trackWorkflowExecution(payload);

			execBuffer = telemetry.getCountsBuffer();

			// should fire event for custom nodes
			expect(spyTrack).toHaveBeenCalledTimes(2);
			expect(spyTrack).toHaveBeenCalledWith('Workflow execution errored', payload);
			expect(execBuffer['1'].manual_error?.count).toBe(4);
			expect(execBuffer['1'].manual_error?.first).toEqual(execTime1);
		});

		test('should track production executions count correctly', async () => {
			const payload = {
				workflow_id: '1',
				is_manual: false,
				success: true,
				error_node_type: 'node_type',
			};

			// successful execution
			const execTime1 = fakeJestSystemTime('2022-01-01 12:00:00');
			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);

			let execBuffer = telemetry.getCountsBuffer();
			expect(execBuffer['1'].manual_error).toBeUndefined();
			expect(execBuffer['1'].manual_success).toBeUndefined();
			expect(execBuffer['1'].prod_error).toBeUndefined();

			expect(execBuffer['1'].prod_success?.count).toBe(1);
			expect(execBuffer['1'].prod_success?.first).toEqual(execTime1);

			// successful execution n8n node
			payload.error_node_type = 'n8n-nodes-base.merge';
			payload.workflow_id = '2';

			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);

			execBuffer = telemetry.getCountsBuffer();
			expect(execBuffer['1'].manual_error).toBeUndefined();
			expect(execBuffer['1'].manual_success).toBeUndefined();
			expect(execBuffer['1'].prod_error).toBeUndefined();

			expect(execBuffer['1'].prod_success?.count).toBe(1);
			expect(execBuffer['2'].prod_success?.count).toBe(1);

			expect(execBuffer['1'].prod_success?.first).toEqual(execTime1);
			expect(execBuffer['2'].prod_success?.first).toEqual(execTime1);

			// additional successful execution
			payload.error_node_type = 'n8n-nodes-base.merge';
			payload.workflow_id = '2';

			telemetry.trackWorkflowExecution(payload);

			payload.error_node_type = 'n8n-nodes-base.merge';
			payload.workflow_id = '1';

			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);
			execBuffer = telemetry.getCountsBuffer();

			expect(execBuffer['1'].manual_error).toBeUndefined();
			expect(execBuffer['1'].manual_success).toBeUndefined();
			expect(execBuffer['1'].prod_error).toBeUndefined();
			expect(execBuffer['2'].manual_error).toBeUndefined();
			expect(execBuffer['2'].manual_success).toBeUndefined();
			expect(execBuffer['2'].prod_error).toBeUndefined();

			expect(execBuffer['1'].prod_success?.count).toBe(2);
			expect(execBuffer['2'].prod_success?.count).toBe(2);

			expect(execBuffer['1'].prod_success?.first).toEqual(execTime1);
			expect(execBuffer['2'].prod_success?.first).toEqual(execTime1);

			// failed execution
			const execTime2 = fakeJestSystemTime('2022-01-01 12:00:00');
			payload.error_node_type = 'custom-package.custom-node';
			payload.success = false;
			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);

			execBuffer = telemetry.getCountsBuffer();

			expect(execBuffer['1'].manual_error).toBeUndefined();
			expect(execBuffer['1'].manual_success).toBeUndefined();
			expect(execBuffer['2'].manual_error).toBeUndefined();
			expect(execBuffer['2'].manual_success).toBeUndefined();
			expect(execBuffer['2'].prod_error).toBeUndefined();

			expect(execBuffer['1'].prod_error?.count).toBe(1);
			expect(execBuffer['1'].prod_success?.count).toBe(2);
			expect(execBuffer['2'].prod_success?.count).toBe(2);

			expect(execBuffer['1'].prod_error?.first).toEqual(execTime2);
			expect(execBuffer['1'].prod_success?.first).toEqual(execTime1);
			expect(execBuffer['2'].prod_success?.first).toEqual(execTime1);

			// failed execution n8n node
			payload.success = false;
			payload.error_node_type = 'n8n-nodes-base.merge';
			payload.is_manual = true;
			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(1);

			execBuffer = telemetry.getCountsBuffer();

			expect(execBuffer['1'].manual_error?.count).toBe(1);
			expect(execBuffer['1'].manual_success).toBeUndefined();
			expect(execBuffer['2'].manual_error).toBeUndefined();
			expect(execBuffer['2'].manual_success).toBeUndefined();
			expect(execBuffer['2'].prod_error).toBeUndefined();
			expect(execBuffer['1'].prod_success?.count).toBe(2);
			expect(execBuffer['1'].prod_error?.count).toBe(1);
			expect(execBuffer['2'].prod_success?.count).toBe(2);

			expect(execBuffer['1'].prod_error?.first).toEqual(execTime2);
			expect(execBuffer['1'].prod_success?.first).toEqual(execTime1);
			expect(execBuffer['2'].prod_success?.first).toEqual(execTime1);
		});
	});

	describe('pulse', () => {
		let pulseSpy: jest.SpyInstance;
		beforeAll(() => {
			startPulseSpy.mockRestore();
		});

		beforeEach(() => {
			fakeJestSystemTime(testDateTime);
			pulseSpy = jest.spyOn(Telemetry.prototype as any, 'pulse').mockName('pulseSpy');
		});

		afterEach(() => {
			pulseSpy.mockClear();
		});

		xtest('should trigger pulse in intervals', async () => {
			expect(pulseSpy).toBeCalledTimes(0);

			jest.advanceTimersToNextTimer();
			await flushPromises();

			expect(pulseSpy).toBeCalledTimes(1);
			expect(spyTrack).toHaveBeenCalledTimes(1);
			expect(spyTrack).toHaveBeenCalledWith('pulse', {
				plan_name_current: 'Community',
				quota: -1,
				usage: 0,
			});

			jest.advanceTimersToNextTimer();

			await flushPromises();

			expect(pulseSpy).toBeCalledTimes(2);
			expect(spyTrack).toHaveBeenCalledTimes(2);
			expect(spyTrack).toHaveBeenCalledWith('pulse', {
				plan_name_current: 'Community',
				quota: -1,
				usage: 0,
			});
		});

		xtest('should track workflow counts correctly', async () => {
			expect(pulseSpy).toBeCalledTimes(0);

			let execBuffer = telemetry.getCountsBuffer();

			// expect clear counters on start
			expect(Object.keys(execBuffer).length).toBe(0);

			const payload = {
				workflow_id: '1',
				is_manual: true,
				success: true,
				error_node_type: 'custom-nodes-base.node-type',
			};

			telemetry.trackWorkflowExecution(payload);
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = false;
			payload.success = true;
			telemetry.trackWorkflowExecution(payload);
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = true;
			payload.success = false;
			telemetry.trackWorkflowExecution(payload);
			telemetry.trackWorkflowExecution(payload);

			payload.is_manual = false;
			payload.success = false;
			telemetry.trackWorkflowExecution(payload);
			telemetry.trackWorkflowExecution(payload);

			payload.workflow_id = '2';
			telemetry.trackWorkflowExecution(payload);
			telemetry.trackWorkflowExecution(payload);

			expect(spyTrack).toHaveBeenCalledTimes(0);
			expect(pulseSpy).toBeCalledTimes(0);

			jest.advanceTimersToNextTimer();

			execBuffer = telemetry.getCountsBuffer();

			await flushPromises();

			expect(pulseSpy).toBeCalledTimes(1);
			expect(spyTrack).toHaveBeenCalledTimes(3);
			expect(spyTrack).toHaveBeenNthCalledWith(
				1,
				'Workflow execution count',
				{
					event_version: '2',
					workflow_id: '1',
					user_id: undefined,
					manual_error: {
						count: 2,
						first: testDateTime,
					},
					manual_success: {
						count: 2,
						first: testDateTime,
					},
					prod_error: {
						count: 2,
						first: testDateTime,
					},
					prod_success: {
						count: 2,
						first: testDateTime,
					},
				},
				{ withPostHog: true },
			);
			expect(spyTrack).toHaveBeenNthCalledWith(
				2,
				'Workflow execution count',
				{
					event_version: '2',
					workflow_id: '2',
					user_id: undefined,
					prod_error: {
						count: 2,
						first: testDateTime,
					},
				},
				{ withPostHog: true },
			);
			expect(spyTrack).toHaveBeenNthCalledWith(3, 'pulse', {
				plan_name_current: 'Community',
				quota: -1,
				usage: 0,
			});
			expect(Object.keys(execBuffer).length).toBe(0);

			// Adding a second step here because we believe PostHog may use timers for sending data
			// and adding posthog to the above metric was causing the pulseSpy timer to not be ran
			jest.advanceTimersToNextTimer();

			execBuffer = telemetry.getCountsBuffer();
			expect(Object.keys(execBuffer).length).toBe(0);

			// @TODO: Flushing promises here is not working

			// expect(pulseSpy).toBeCalledTimes(2);
			// expect(spyTrack).toHaveBeenCalledTimes(4);
			// expect(spyTrack).toHaveBeenNthCalledWith(4, 'pulse', {
			// 	plan_name_current: 'Community',
			// 	quota: -1,
			// 	usage: 0,
			// });
		});
	});
});

const fakeJestSystemTime = (dateTime: string | Date): Date => {
	const dt = new Date(dateTime);
	jest.setSystemTime(dt);
	return dt;
};