import { getSiteStrings } from '@launch/api/DataApi';

const fallback = { aiHeaders: [], aiBlogTitles: [] };
const originalFetch = global.fetch;

describe('getSiteStrings', () => {
	beforeEach(() => {
		global.fetch = jest.fn();
	});

	afterEach(() => {
		jest.clearAllMocks();
		global.fetch = originalFetch;
	});

	it('returns parsed JSON when fetch succeeds with valid data', async () => {
		const mockResponse = {
			aiHeaders: ['Header 1', 'Header 2'],
			aiBlogTitles: ['Post A', 'Post B'],
		};
		global.fetch.mockResolvedValueOnce({
			ok: true,
			json: () => mockResponse,
		});

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(mockResponse);
		expect(global.fetch).toHaveBeenCalledTimes(1);
	});

	it('returns fallback when first fetch throws and second returns not ok', async () => {
		global.fetch
			.mockRejectedValueOnce(new Error('Network error'))
			.mockResolvedValueOnce({ ok: false });

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(2);
	});

	it('returns fallback when both fetch attempts throw', async () => {
		global.fetch
			.mockRejectedValueOnce(new Error('Network error'))
			.mockRejectedValueOnce(new Error('Still failing'));

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(2);
	});

	it('returns fallback when response is ok but JSON parsing fails', async () => {
		global.fetch.mockResolvedValueOnce({
			ok: true,
			json: () => {
				throw new Error('Invalid JSON');
			},
		});

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(1);
	});

	it('returns fallback when response is ok but payload lacks aiHeaders', async () => {
		global.fetch.mockResolvedValueOnce({
			ok: true,
			json: () => ({ aiBlogTitles: ['Only titles, no headers'] }),
		});

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(1);
	});

	it('returns fallback when fetch resolves with undefined response', async () => {
		global.fetch.mockResolvedValueOnce(undefined);

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(1);
	});

	it('returns fallback when response ok=false without throwing (no retry by design)', async () => {
		global.fetch.mockResolvedValueOnce({ ok: false });

		const result = await getSiteStrings({ foo: 'bar' });
		expect(result).toEqual(fallback);
		expect(global.fetch).toHaveBeenCalledTimes(1);
	});
});
