import { describe, expect, it, vi, beforeEach } from 'vitest';

vi.mock('$lib/api.server', () => ({ createApiClient: vi.fn() }));

import { load, actions } from './+page.server';
import { createApiClient } from '$lib/api.server';

beforeEach(() => vi.clearAllMocks());

function makeUrl(params: Record<string, string> = {}) {
	const url = new URL('http://localhost/notifications');
	for (const [key, value] of Object.entries(params)) {
		url.searchParams.set(key, value);
	}
	return url;
}

// ─── load ─────────────────────────────────────────────────────────────────────

describe('notifications page load', () => {
	it('returns notifications and unreadCount from API response', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: true },
			data: {
				content: [
					{ id: 'n1', read: false },
					{ id: 'n2', read: true },
					{ id: 'n3', read: false }
				],
				totalElements: 3,
				totalPages: 1,
				number: 0
			}
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		const result = await load({ url: makeUrl(), fetch: vi.fn() as unknown as typeof fetch });

		expect(result.notifications).toHaveLength(3);
		expect(result.unreadCount).toBe(2);
	});

	it('passes type param to API when ?type=MENTION is in URL', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: true },
			data: { content: [], totalElements: 0, totalPages: 0, number: 0 }
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		await load({ url: makeUrl({ type: 'MENTION' }), fetch: vi.fn() as unknown as typeof fetch });

		const queryParams = mockGet.mock.calls[0][1].params.query;
		expect(queryParams.type).toBe('MENTION');
	});

	it('passes read=false to API when ?read=false is in URL', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: true },
			data: { content: [], totalElements: 0, totalPages: 0, number: 0 }
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		await load({ url: makeUrl({ read: 'false' }), fetch: vi.fn() as unknown as typeof fetch });

		const queryParams = mockGet.mock.calls[0][1].params.query;
		expect(queryParams.read).toBe(false);
	});

	it('passes no filter params when no search params present', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: true },
			data: { content: [], totalElements: 0, totalPages: 0, number: 0 }
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		await load({ url: makeUrl(), fetch: vi.fn() as unknown as typeof fetch });

		const queryParams = mockGet.mock.calls[0][1].params.query;
		expect(queryParams.type).toBeUndefined();
		expect(queryParams.read).toBeUndefined();
	});

	it('calls the API exactly once — no separate round-trip for unreadCount', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: true },
			data: { content: [], totalElements: 0, totalPages: 0, number: 0 }
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		await load({ url: makeUrl(), fetch: vi.fn() as unknown as typeof fetch });

		expect(mockGet).toHaveBeenCalledTimes(1);
	});

	it('throws 401 error when API returns 401', async () => {
		const mockGet = vi.fn().mockResolvedValueOnce({
			response: { ok: false, status: 401 },
			data: null
		});
		vi.mocked(createApiClient).mockReturnValue({ GET: mockGet } as ReturnType<
			typeof createApiClient
		>);

		await expect(
			load({ url: makeUrl(), fetch: vi.fn() as unknown as typeof fetch })
		).rejects.toMatchObject({ status: 401 });
	});
});

// ─── mark-all action ──────────────────────────────────────────────────────────

describe('notifications mark-all action', () => {
	it('calls POST /api/notifications/read-all and redirects', async () => {
		const mockPost = vi.fn().mockResolvedValueOnce({ response: { ok: true } });
		vi.mocked(createApiClient).mockReturnValue({ POST: mockPost } as ReturnType<
			typeof createApiClient
		>);

		const markAll = actions['mark-all'] as (ctx: { fetch: typeof fetch }) => Promise<never>;
		await expect(markAll({ fetch: vi.fn() as unknown as typeof fetch })).rejects.toMatchObject({
			location: '/notifications'
		});

		expect(mockPost).toHaveBeenCalledTimes(1);
	});
});