import { signal } from '@angular/core';
import { fireEvent, render, screen } from '@testing-library/angular';
import { of, throwError } from 'rxjs';
import { AuthService } from 'auth';
import { BffApiV1Service } from 'api-client';
import { axe } from 'vitest-axe';
import { RegistrationPage } from './registration-page';

class FakeAuth extends AuthService {
  readonly isAuthenticated = signal(true);
  readonly bsn = signal<string | undefined>('123456782');
  login(): void {
    /* noop */
  }
  logout(): void {
    /* noop */
  }
}

function providers(
  post = vi.fn().mockReturnValue(of({ registrationId: 'reg-9', status: 'Ingediend' })),
  withdraw = vi.fn().mockReturnValue(of(undefined)),
  provideDocuments = vi.fn().mockReturnValue(of(undefined)),
  // Resume lookup (S-26): default to 204/empty — no in-flight registration, so the submit form shows.
  getCurrent = vi.fn().mockReturnValue(of(undefined)),
) {
  return {
    post,
    withdraw,
    provideDocuments,
    getCurrent,
    providers: [
      { provide: AuthService, useClass: FakeAuth },
      {
        provide: BffApiV1Service,
        useValue: {
          getSelfServiceRegistrations: getCurrent,
          postSelfServiceRegistrations: post,
          postSelfServiceRegistrationsIdWithdraw: withdraw,
          postSelfServiceRegistrationsIdDocuments: provideDocuments,
        },
      },
    ],
  };
}

describe('RegistrationPage', () => {
  it('shows the signed-in BSN', async () => {
    await render(RegistrationPage, { providers: providers().providers });
    expect(screen.getByText(/123456782/)).toBeTruthy();
  });

  it('submits the registration and confirms', async () => {
    const { post, providers: p } = providers();
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));

    expect(post).toHaveBeenCalledTimes(1);
    expect(await screen.findByText(/ontvangen/i)).toBeTruthy();
  });

  it('resumes an existing registration on load, without submitting again (S-26)', async () => {
    const { post, providers: p } = providers(
      undefined,
      undefined,
      undefined,
      vi.fn().mockReturnValue(of({ registrationId: 'reg-77', status: 'Ingediend' })),
    );
    await render(RegistrationPage, { providers: p });

    // The confirmation view is restored from the in-flight registration — no submit click.
    expect(await screen.findByText(/ontvangen/i)).toBeTruthy();
    expect(screen.getByText(/reg-77/)).toBeTruthy();
    expect(post).not.toHaveBeenCalled();
  });

  it('shows an error and keeps the submit available when the BFF call fails', async () => {
    const { post, providers: p } = providers(vi.fn().mockReturnValue(throwError(() => new Error('BFF rejected'))));
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));

    expect(post).toHaveBeenCalledTimes(1);
    // The failure is surfaced (not swallowed), the confirmation is not shown, and the user can retry.
    expect(await screen.findByRole('alert')).toBeTruthy();
    expect(screen.queryByText(/ontvangen/i)).toBeNull();
    expect(screen.getByRole('button', { name: /indienen/i })).toBeTruthy();
  });

  it('offers to withdraw after submitting, and withdrawing confirms', async () => {
    const { withdraw, providers: p } = providers();
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));
    await screen.findByText(/ontvangen/i);

    fireEvent.click(await screen.findByRole('button', { name: /trek aanvraag in/i }));

    // The withdrawal is keyed by the reference the submit returned, and the page confirms it.
    expect(withdraw).toHaveBeenCalledWith('reg-9');
    expect(await screen.findByText(/ingetrokken/i)).toBeTruthy();
  });

  // A small PDF file the citizen "uploads"; the component base64-encodes it client-side.
  const diploma = () => new File([new Uint8Array([1, 2, 3])], 'diploma.pdf', { type: 'application/pdf' });

  it('uploads a chosen diploma after submitting, and doing so confirms', async () => {
    const { provideDocuments, providers: p } = providers();
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));
    await screen.findByText(/ontvangen/i);

    // Choose the file, then upload it.
    fireEvent.change(screen.getByLabelText(/diploma/i), { target: { files: [diploma()] } });
    fireEvent.click(await screen.findByRole('button', { name: /documenten aanleveren/i }));

    // The upload is keyed by the reference and carries the base64 file + its name; the page confirms.
    expect(await screen.findByText(/documenten.*aangeleverd/i)).toBeTruthy();
    expect(provideDocuments).toHaveBeenCalledWith(
      'reg-9',
      expect.objectContaining({ fileName: 'diploma.pdf', contentType: 'application/pdf', contentBase64: expect.any(String) }),
    );
  });

  it('surfaces a diploma-upload failure and keeps the action available', async () => {
    const { providers: p } = providers(
      vi.fn().mockReturnValue(of({ registrationId: 'reg-9', status: 'Ingediend' })),
      vi.fn().mockReturnValue(of(undefined)),
      vi.fn().mockReturnValue(throwError(() => new Error('documents rejected'))),
    );
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));
    await screen.findByText(/ontvangen/i);
    fireEvent.change(screen.getByLabelText(/diploma/i), { target: { files: [diploma()] } });
    fireEvent.click(await screen.findByRole('button', { name: /documenten aanleveren/i }));

    expect(await screen.findByRole('alert')).toBeTruthy();
    expect(screen.queryByText(/aangeleverd/i)).toBeNull();
    expect(screen.getByRole('button', { name: /documenten aanleveren/i })).toBeTruthy();
  });

  it('surfaces a withdraw failure and keeps the action available', async () => {
    const { providers: p } = providers(
      vi.fn().mockReturnValue(of({ registrationId: 'reg-9', status: 'Ingediend' })),
      vi.fn().mockReturnValue(throwError(() => new Error('withdraw rejected'))),
    );
    await render(RegistrationPage, { providers: p });

    fireEvent.click(screen.getByRole('button', { name: /indienen/i }));
    await screen.findByText(/ontvangen/i);
    fireEvent.click(await screen.findByRole('button', { name: /trek aanvraag in/i }));

    expect(await screen.findByRole('alert')).toBeTruthy();
    expect(screen.queryByText(/is ingetrokken/i)).toBeNull();
    expect(screen.getByRole('button', { name: /trek aanvraag in/i })).toBeTruthy();
  });

  it('has no WCAG 2.1 AA violations on the submit page', async () => {
    // The portal is Dutch; the real index.html sets lang. Set it here so the document-level
    // html-has-lang rule reflects the app, not the bare jsdom document.
    document.documentElement.lang = 'nl';
    const { container } = await render(RegistrationPage, { providers: providers().providers });

    const results = await axe(container, {
      runOnly: { type: 'tag', values: ['wcag2a', 'wcag2aa', 'wcag21a', 'wcag21aa'] },
    });

    expect(results.violations).toEqual([]);
  });
});