import { mock } from 'jest-mock-extended';
import { ApplicationError } from 'n8n-workflow';
import type {
	Workflow,
	INode,
	INodeExecutionData,
	IPollFunctions,
	IWorkflowExecuteAdditionalData,
	INodeType,
	INodeTypes,
	ITriggerFunctions,
	WorkflowHooks,
	IRun,
} from 'n8n-workflow';

import { TriggersAndPollers } from '@/TriggersAndPollers';

describe('TriggersAndPollers', () => {
	const node = mock<INode>();
	const nodeType = mock<INodeType>({
		trigger: undefined,
		poll: undefined,
	});
	const nodeTypes = mock<INodeTypes>();
	const workflow = mock<Workflow>({ nodeTypes });
	const hookFunctions = mock<WorkflowHooks['hookFunctions']>({
		sendResponse: [],
		workflowExecuteAfter: [],
	});
	const additionalData = mock<IWorkflowExecuteAdditionalData>({
		hooks: {
			hookFunctions,
		},
	});
	const triggersAndPollers = new TriggersAndPollers();

	beforeEach(() => {
		jest.clearAllMocks();
		nodeTypes.getByNameAndVersion.mockReturnValue(nodeType);
	});

	describe('runTrigger()', () => {
		const triggerFunctions = mock<ITriggerFunctions>();
		const getTriggerFunctions = jest.fn().mockReturnValue(triggerFunctions);
		const triggerFn = jest.fn();
		const mockEmitData: INodeExecutionData[][] = [[{ json: { data: 'test' } }]];

		const runTriggerHelper = async (mode: 'manual' | 'trigger' = 'trigger') =>
			await triggersAndPollers.runTrigger(
				workflow,
				node,
				getTriggerFunctions,
				additionalData,
				mode,
				'init',
			);

		it('should throw error if node type does not have trigger function', async () => {
			await expect(runTriggerHelper()).rejects.toThrow(ApplicationError);
		});

		it('should call trigger function in regular mode', async () => {
			nodeType.trigger = triggerFn;
			triggerFn.mockResolvedValue({ test: true });

			const result = await runTriggerHelper();

			expect(triggerFn).toHaveBeenCalled();
			expect(result).toEqual({ test: true });
		});

		describe('manual mode', () => {
			const getMockTriggerFunctions = () => getTriggerFunctions.mock.results[0]?.value;

			beforeEach(() => {
				nodeType.trigger = triggerFn;
				triggerFn.mockResolvedValue({ workflowId: '123' });
			});

			it('should handle promise resolution', async () => {
				const result = await runTriggerHelper('manual');

				expect(result?.manualTriggerResponse).toBeInstanceOf(Promise);
				getMockTriggerFunctions()?.emit?.(mockEmitData);
			});

			it('should handle error emission', async () => {
				const testError = new Error('Test error');
				const result = await runTriggerHelper('manual');

				getMockTriggerFunctions()?.emitError?.(testError);
				await expect(result?.manualTriggerResponse).rejects.toThrow(testError);
			});

			it('should handle response promise', async () => {
				const responsePromise = { resolve: jest.fn(), reject: jest.fn() };
				await runTriggerHelper('manual');

				getMockTriggerFunctions()?.emit?.(mockEmitData, responsePromise);

				expect(hookFunctions.sendResponse?.length).toBe(1);
				await hookFunctions.sendResponse![0]?.({ testResponse: true });
				expect(responsePromise.resolve).toHaveBeenCalledWith({ testResponse: true });
			});

			it('should handle both response and done promises', async () => {
				const responsePromise = { resolve: jest.fn(), reject: jest.fn() };
				const donePromise = { resolve: jest.fn(), reject: jest.fn() };
				const mockRunData = mock<IRun>({ data: { resultData: { runData: {} } } });

				await runTriggerHelper('manual');
				getMockTriggerFunctions()?.emit?.(mockEmitData, responsePromise, donePromise);

				await hookFunctions.sendResponse![0]?.({ testResponse: true });
				expect(responsePromise.resolve).toHaveBeenCalledWith({ testResponse: true });

				await hookFunctions.workflowExecuteAfter?.[0]?.(mockRunData, {});
				expect(donePromise.resolve).toHaveBeenCalledWith(mockRunData);
			});
		});
	});

	describe('runPoll()', () => {
		const pollFunctions = mock<IPollFunctions>();
		const pollFn = jest.fn();

		const runPollHelper = async () =>
			await triggersAndPollers.runPoll(workflow, node, pollFunctions);

		it('should throw error if node type does not have poll function', async () => {
			await expect(runPollHelper()).rejects.toThrow(ApplicationError);
		});

		it('should call poll function and return result', async () => {
			const mockPollResult: INodeExecutionData[][] = [[{ json: { data: 'test' } }]];
			nodeType.poll = pollFn;
			pollFn.mockResolvedValue(mockPollResult);

			const result = await runPollHelper();

			expect(pollFn).toHaveBeenCalled();
			expect(result).toBe(mockPollResult);
		});

		it('should return null if poll function returns no data', async () => {
			nodeType.poll = pollFn;
			pollFn.mockResolvedValue(null);

			const result = await runPollHelper();

			expect(pollFn).toHaveBeenCalled();
			expect(result).toBeNull();
		});

		it('should propagate errors from poll function', async () => {
			nodeType.poll = pollFn;
			pollFn.mockRejectedValue(new Error('Poll function failed'));

			await expect(runPollHelper()).rejects.toThrow('Poll function failed');
			expect(pollFn).toHaveBeenCalled();
		});
	});
});