import { describe, expect, it, vi, beforeEach } from 'vitest';
import { load } from './+page.server';

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

import { createApiClient } from '$lib/api.server';

const adminUser = { groups: [{ permissions: ['ADMIN'] }] };
const readOnlyUser = { groups: [{ permissions: ['READ_ALL'] }] };

function mockApiReturning(users: unknown[], groups: unknown[], tags: unknown[]) {
	vi.mocked(createApiClient).mockReturnValue({
		GET: vi
			.fn()
			.mockResolvedValueOnce({ response: { ok: true }, data: users })
			.mockResolvedValueOnce({ response: { ok: true }, data: groups })
			.mockResolvedValueOnce({ response: { ok: true }, data: tags })
	} as ReturnType<typeof createApiClient>);
}

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

// ─── permission check ─────────────────────────────────────────────────────────

describe('admin load — permission check', () => {
	it('throws 403 when user has no ADMIN permission', async () => {
		await expect(
			load({ fetch: vi.fn() as unknown as typeof fetch, locals: { user: readOnlyUser } })
		).rejects.toMatchObject({ status: 403 });
	});

	it('throws 403 when user is undefined', async () => {
		await expect(
			load({ fetch: vi.fn() as unknown as typeof fetch, locals: { user: undefined } })
		).rejects.toMatchObject({ status: 403 });
	});

	it('throws 403 when user has no groups', async () => {
		await expect(
			load({ fetch: vi.fn() as unknown as typeof fetch, locals: { user: { groups: [] } } })
		).rejects.toMatchObject({ status: 403 });
	});
});

// ─── happy path ───────────────────────────────────────────────────────────────

describe('admin load — happy path', () => {
	it('returns users, groups, and tags for an admin user', async () => {
		mockApiReturning(
			[{ id: 'u1', username: 'alice' }],
			[{ id: 'g1', name: 'Editors' }],
			[{ id: 't1', name: 'Familie' }]
		);

		const result = await load({
			fetch: vi.fn() as unknown as typeof fetch,
			locals: { user: adminUser }
		});

		expect(result.users).toHaveLength(1);
		expect(result.groups).toHaveLength(1);
		expect(result.tags).toHaveLength(1);
	});

	it('returns empty arrays when API returns no data', async () => {
		mockApiReturning([], [], []);

		const result = await load({
			fetch: vi.fn() as unknown as typeof fetch,
			locals: { user: adminUser }
		});

		expect(result.users).toEqual([]);
		expect(result.groups).toEqual([]);
		expect(result.tags).toEqual([]);
	});
});