import { getDownloadFields } from '../../../v2/methods/loadOptions';

// Mock ColumnsFetcher globally
const mockColumnsFetcher = {
	fetchFromDefinedParam: jest.fn(),
};

jest.mock('../../../v2/helpers/columns-fetcher', () => ({
	ColumnsFetcher: jest.fn(() => mockColumnsFetcher),
}));

describe('NocoDB Load Options', () => {
	describe('getDownloadFields', () => {
		beforeEach(() => {
			mockColumnsFetcher.fetchFromDefinedParam.mockClear();
		});

		it('should return attachment fields for version 4', async () => {
			const mockThis = {
				getNodeParameter: (param: string) => {
					if (param === 'version') return 4;
					return '';
				},
			};

			mockColumnsFetcher.fetchFromDefinedParam.mockResolvedValueOnce([
				{ title: 'Field1', type: 'Attachment', uidt: 'Attachment' },
				{ title: 'Field2', type: 'Text', uidt: 'Text' },
				{ title: 'Field3', type: 'Attachment', uidt: 'Attachment' },
			]);

			const result = await getDownloadFields.call(mockThis as any);
			expect(result).toEqual([
				{ name: 'Field1', value: 'Field1' },
				{ name: 'Field3', value: 'Field3' },
			]);
			expect(mockColumnsFetcher.fetchFromDefinedParam).toHaveBeenCalled();
		});

		it('should return attachment fields for version 3 (using uidt)', async () => {
			const mockThis = {
				getNodeParameter: (param: string) => {
					if (param === 'version') return 3;
					return '';
				},
			};

			mockColumnsFetcher.fetchFromDefinedParam.mockResolvedValueOnce([
				{ title: 'FieldA', type: 'Attachment', uidt: 'Attachment' },
				{ title: 'FieldB', type: 'Number', uidt: 'Number' },
				{ title: 'FieldC', type: 'Attachment', uidt: 'Attachment' },
			]);

			const result = await getDownloadFields.call(mockThis as any);
			expect(result).toEqual([
				{ name: 'FieldA', value: 'FieldA' },
				{ name: 'FieldC', value: 'FieldC' },
			]);
			expect(mockColumnsFetcher.fetchFromDefinedParam).toHaveBeenCalled();
		});

		it('should return empty array if no attachment fields are found', async () => {
			const mockThis = {
				getNodeParameter: (param: string) => {
					if (param === 'version') return 4;
					return '';
				},
			};

			mockColumnsFetcher.fetchFromDefinedParam.mockResolvedValueOnce([
				{ title: 'FieldX', type: 'Text', uidt: 'Text' },
				{ title: 'FieldY', type: 'Number', uidt: 'Number' },
			]);

			const result = await getDownloadFields.call(mockThis as any);
			expect(result).toEqual([]);
			expect(mockColumnsFetcher.fetchFromDefinedParam).toHaveBeenCalled();
		});
	});
});