import { mock } from 'jest-mock-extended';
import * as mssql from 'mssql';
import { constructExecutionMetaData, returnJsonArray } from 'n8n-core';
import type { IExecuteFunctions } from 'n8n-workflow';

import { MicrosoftSql } from '../MicrosoftSql.node';

jest.mock('mssql');

function getMockedExecuteFunctions(overrides: Partial<IExecuteFunctions> = {}) {
	return mock<IExecuteFunctions>({
		getCredentials: jest.fn().mockResolvedValue({
			server: 'localhost',
			database: 'testdb',
			user: 'testuser',
			password: 'testpass',
			port: 1433,
			tls: false,
			allowUnauthorizedCerts: true,
			tdsVersion: '7_4',
			connectTimeout: 1000,
			requestTimeout: 10000,
		}),
		getInputData: jest.fn().mockReturnValue([{ json: {} }]),
		getNode: jest.fn().mockReturnValue({ typeVersion: 1.1 }),
		continueOnFail: jest.fn().mockReturnValue(true),
		helpers: {
			constructExecutionMetaData,
			returnJsonArray,
		},
		evaluateExpression: jest.fn((_val) => _val),
		...overrides,
	});
}

describe('MicrosoftSql Node', () => {
	let mockedConnectionPool: jest.MockedClass<typeof mssql.ConnectionPool>;

	beforeEach(() => {
		mockedConnectionPool = mssql.ConnectionPool as jest.MockedClass<typeof mssql.ConnectionPool>;
	});

	test('handles connection error with continueOnFail', async () => {
		const fakeError = new Error('Connection failed');
		mockedConnectionPool.mockReturnValue(
			mock<mssql.ConnectionPool>({
				connect: jest.fn().mockRejectedValue(fakeError),
				close: jest.fn(),
			}),
		);

		const node = new MicrosoftSql();
		const context = getMockedExecuteFunctions();
		const result = await node.execute.call(context);

		expect(result).toEqual([[{ json: { error: 'Connection failed' }, pairedItem: [{ item: 0 }] }]]);
	});

	test('executes query on happy path', async () => {
		const queryResult = { recordsets: [[{ value: 1 }]] };
		const mockRequest = { query: jest.fn().mockResolvedValue(queryResult) };
		const mockPool = mock<mssql.ConnectionPool>({
			connect: jest.fn().mockResolvedValue(undefined),
			close: jest.fn(),
			request: jest.fn().mockReturnValue(mockRequest),
		});

		mockedConnectionPool.mockReturnValue(mockPool);

		const node = new MicrosoftSql();
		const context = getMockedExecuteFunctions({
			getNodeParameter: jest.fn().mockImplementation((paramName: string) => {
				if (paramName === 'operation') return 'executeQuery';
				if (paramName === 'query') return 'SELECT 1 AS value';
				if (paramName === 'options.queryReplacement') return '';
				return undefined;
			}),
		});
		const result = await node.execute.call(context);

		expect(result).toEqual([[{ json: { value: 1 }, pairedItem: [{ item: 0 }] }]]);
		expect(mockRequest.query).toHaveBeenCalledWith('SELECT 1 AS value');
		expect(mockPool.close).toHaveBeenCalled();
	});

	test('correctly resolves expressions (does not remove $ characters)', async () => {
		const queryResult = { recordsets: [[{ value: 1 }]] };
		const mockRequest = { query: jest.fn().mockResolvedValue(queryResult) };
		const mockPool = mock<mssql.ConnectionPool>({
			connect: jest.fn().mockResolvedValue(undefined),
			close: jest.fn(),
			request: jest.fn().mockReturnValue(mockRequest),
		});

		mockedConnectionPool.mockReturnValue(mockPool);

		const node = new MicrosoftSql();
		const context = getMockedExecuteFunctions({
			getNodeParameter: jest.fn().mockImplementation((paramName: string) => {
				if (paramName === 'operation') return 'executeQuery';
				if (paramName === 'query') return "SELECT '{{ '$$$' }}'";
				if (paramName === 'options.queryReplacement') return '';
				return undefined;
			}),
		});
		context.evaluateExpression.mockReturnValue('$$$');

		await node.execute.call(context);

		expect(mockRequest.query).toHaveBeenCalledWith("SELECT '$$$'");
	});

	test.each([
		{
			label: 'comma-separated string',
			queryReplacement: '5, Alice',
			query: 'SELECT * FROM users WHERE id = $1 AND name = $2',
			expectedQuery: 'SELECT * FROM users WHERE id = @p1 AND name = @p2',
			expectedInputs: [
				['p1', '5'],
				['p2', 'Alice'],
			] as Array<[string, unknown]>,
		},
		{
			label: 'array of strings',
			queryReplacement: ['5', 'Alice'],
			query: 'SELECT * FROM users WHERE id = $1 AND name = $2',
			expectedQuery: 'SELECT * FROM users WHERE id = @p1 AND name = @p2',
			expectedInputs: [
				['p1', '5'],
				['p2', 'Alice'],
			] as Array<[string, unknown]>,
		},
		{
			label: 'single number',
			queryReplacement: 42,
			query: 'SELECT * FROM users WHERE id = $1',
			expectedQuery: 'SELECT * FROM users WHERE id = @p1',
			expectedInputs: [['p1', 42]] as Array<[string, unknown]>,
		},
		{
			label: 'single boolean',
			queryReplacement: true,
			query: 'SELECT * FROM users WHERE active = $1',
			expectedQuery: 'SELECT * FROM users WHERE active = @p1',
			expectedInputs: [['p1', true]] as Array<[string, unknown]>,
		},
	])(
		'executes query with parameters supplied as $label',
		async ({ query, queryReplacement, expectedQuery, expectedInputs }) => {
			const queryResult = { recordsets: [[{ id: 1 }]] };
			const mockRequest = {
				query: jest.fn().mockResolvedValue(queryResult),
				input: jest.fn(),
			};
			const mockPool = mock<mssql.ConnectionPool>({
				connect: jest.fn().mockResolvedValue(undefined),
				close: jest.fn(),
				request: jest.fn().mockReturnValue(mockRequest),
			});

			mockedConnectionPool.mockReturnValue(mockPool);

			const node = new MicrosoftSql();
			const context = getMockedExecuteFunctions({
				getNodeParameter: jest.fn().mockImplementation((paramName: string) => {
					if (paramName === 'operation') return 'executeQuery';
					if (paramName === 'query') return query;
					if (paramName === 'options.queryReplacement') return queryReplacement;
					return undefined;
				}),
			});
			await node.execute.call(context);

			expect(mockRequest.query).toHaveBeenCalledWith(expectedQuery);
			for (const [param, value] of expectedInputs) {
				expect(mockRequest.input).toHaveBeenCalledWith(param, value);
			}
		},
	);

	describe('delete operation parameter validation', () => {
		const buildPoolMock = () => {
			const mockRequest = {
				query: jest.fn().mockResolvedValue({ rowsAffected: [1] }),
				input: jest.fn(),
			};
			const mockPool = mock<mssql.ConnectionPool>({
				connect: jest.fn().mockResolvedValue(undefined),
				close: jest.fn(),
				request: jest.fn().mockReturnValue(mockRequest),
			});
			return mockPool;
		};

		it('should not alter shared object state when delete parameters contain reserved tokens', async () => {
			const protoKeysBefore = Object.getOwnPropertyNames(Object.prototype);

			mockedConnectionPool.mockReturnValue(buildPoolMock());
			const node = new MicrosoftSql();

			for (const reserved of ['__proto__', 'constructor', 'prototype']) {
				const context = getMockedExecuteFunctions({
					getInputData: jest.fn().mockReturnValue([{ json: { id: 1 }, pairedItem: { item: 0 } }]),
					getNodeParameter: jest.fn().mockImplementation((paramName: string) => {
						if (paramName === 'operation') return 'delete';
						if (paramName === 'table') return reserved;
						if (paramName === 'deleteKey') return 'id';
						return undefined;
					}),
					continueOnFail: jest.fn().mockReturnValue(false),
				});
				await node.execute.call(context);
			}

			expect(Object.getOwnPropertyNames(Object.prototype)).toEqual(protoKeysBefore);
		});
	});
});