import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import {
  ReminderRequestError,
  createReminder,
  deleteReminder,
  getReminderEmailStatus,
  listReminders,
  snoozeReminder,
  updateReminder,
} from './reminders-api';

const fetchMock = vi.fn();

beforeEach(() => {
  vi.stubGlobal('fetch', fetchMock);
});

afterEach(() => {
  fetchMock.mockReset();
  vi.unstubAllGlobals();
});

const ok = (body: unknown) => ({ ok: true, status: 200, json: async () => body });

describe('reminders-api', () => {
  it('listReminders ruft GET /reminders mit Cookie-Anmeldung', async () => {
    fetchMock.mockResolvedValue(ok([]));
    await expect(listReminders()).resolves.toEqual([]);
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders$/);
    expect(init.credentials).toBe('include');
  });

  it('createReminder schickt POST mit JSON-Koerper', async () => {
    fetchMock.mockResolvedValue(ok({ id: 'r1' }));
    await createReminder({ title: 'a', dueAt: '2099-01-01T10:00:00.000Z' });
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders$/);
    expect(init.method).toBe('POST');
    expect(init.credentials).toBe('include');
    expect(JSON.parse(init.body)).toEqual({ title: 'a', dueAt: '2099-01-01T10:00:00.000Z' });
  });

  it('updateReminder schickt PATCH an /reminders/:id', async () => {
    fetchMock.mockResolvedValue(ok({ id: 'r 1' }));
    await updateReminder('r 1', { title: 'neu' });
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders\/r%201$/);
    expect(init.method).toBe('PATCH');
    expect(init.credentials).toBe('include');
    expect(JSON.parse(init.body)).toEqual({ title: 'neu' });
  });

  it('snoozeReminder schickt POST /reminders/:id/snooze mit dueAt', async () => {
    fetchMock.mockResolvedValue(ok({ id: 'r1' }));
    await snoozeReminder('r1', '2099-01-01T10:00:00.000Z');
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders\/r1\/snooze$/);
    expect(init.method).toBe('POST');
    expect(JSON.parse(init.body)).toEqual({ dueAt: '2099-01-01T10:00:00.000Z' });
  });

  it('deleteReminder schickt DELETE an /reminders/:id', async () => {
    fetchMock.mockResolvedValue(ok({ deleted: true }));
    await expect(deleteReminder('r1')).resolves.toEqual({ deleted: true });
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders\/r1$/);
    expect(init.method).toBe('DELETE');
    expect(init.credentials).toBe('include');
  });

  it('getReminderEmailStatus ruft GET /reminders/email-status', async () => {
    fetchMock.mockResolvedValue(ok({ smtpConfigured: true, hasEmail: false }));
    await expect(getReminderEmailStatus()).resolves.toEqual({ smtpConfigured: true, hasEmail: false });
    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toMatch(/\/reminders\/email-status$/);
    expect(init.credentials).toBe('include');
  });

  it('bei 404 und 409 tragen die Fehler den Status', async () => {
    fetchMock.mockResolvedValue({ ok: false, status: 404, json: async () => ({}) });
    await expect(deleteReminder('x')).rejects.toMatchObject({ status: 404 });
    fetchMock.mockResolvedValue({ ok: false, status: 409, json: async () => ({}) });
    await expect(snoozeReminder('x', 'y')).rejects.toMatchObject({ status: 409 });
  });

  it('ein Status ausserhalb 2xx wirft ReminderRequestError mit diesem Status', async () => {
    fetchMock.mockResolvedValue({ ok: false, status: 401, json: async () => ({}) });
    await expect(listReminders()).rejects.toMatchObject({ status: 401 });
    fetchMock.mockResolvedValue({ ok: false, status: 409, json: async () => ({}) });
    const err = await createReminder({ title: 'a', dueAt: 'x' }).catch((e) => e);
    expect(err).toBeInstanceOf(ReminderRequestError);
    expect(err.status).toBe(409);
  });
});