import request from 'supertest';
import app from '../../src/app';
import { pool } from '../../src/db';
import { resetDb, closeDb } from './setup/testDb';
import { renderTemplate } from '../../src/emailTemplates';
import { loadStoredTemplate } from '../../src/routes/adminEmailTemplates';

beforeEach(async () => {
  // resetDb clears stored email templates as well, so a template saved by one
  // test cannot change the mail another asserts on.
  await resetDb();
});

afterAll(async () => {
  await pool.end();
  await closeDb();
});

const VALID_RESET_BODY = 'New copy. [Choose a new password]({{resetUrl}}) within the hour.';

describe('GET /api/admin/email-templates', () => {
  it('lists every template with its defaults and placeholder rules', async () => {
    const res = await request(app).get('/api/admin/email-templates');

    expect(res.status).toBe(200);
    expect(res.body.map((t: { key: string }) => t.key).sort()).toEqual([
      'cartReminder',
      'favoriteSold',
      'favoriteWithdrawn',
      'passwordReset',
      'verification'
    ]);

    const reset = res.body.find((t: { key: string }) => t.key === 'passwordReset');
    expect(reset.required).toEqual(['resetUrl']);
    expect(reset.defaultBody).toContain('{{resetUrl}}');
  });

  // Null rather than the default text, so the screen can tell "never edited"
  // from "edited to something identical to the default".
  it('reports an uncustomised template as null rather than as its default', async () => {
    const res = await request(app).get('/api/admin/email-templates');
    const reset = res.body.find((t: { key: string }) => t.key === 'passwordReset');

    expect(reset.subject).toBeNull();
    expect(reset.body).toBeNull();
  });
});

describe('PUT /api/admin/email-templates/:key', () => {
  it('stores a replacement subject and body', async () => {
    const res = await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Your reset link', body: VALID_RESET_BODY });

    expect(res.status).toBe(200);

    const listed = await request(app).get('/api/admin/email-templates');
    const reset = listed.body.find((t: { key: string }) => t.key === 'passwordReset');
    expect(reset.subject).toBe('Your reset link');
    expect(reset.body).toBe(VALID_RESET_BODY);
  });

  // The rule that keeps this from being a way to break password resets from a
  // settings screen.
  it('refuses a body that has dropped the required placeholder', async () => {
    const res = await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Your reset link', body: 'Just click the thing.' });

    expect(res.status).toBe(400);
    expect(res.body.error).toContain('{{resetUrl}}');
  });

  it('names every missing placeholder, not just the first', async () => {
    const res = await request(app)
      .put('/api/admin/email-templates/cartReminder')
      .send({ subject: 'Your cart', body: 'You left things behind.' });

    expect(res.status).toBe(400);
    expect(res.body.error).toContain('{{itemList}}');
    expect(res.body.error).toContain('{{cartUrl}}');
  });

  it('refuses an empty subject or body', async () => {
    const noSubject = await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: '  ', body: VALID_RESET_BODY });
    expect(noSubject.status).toBe(400);

    const noBody = await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Something', body: '   ' });
    expect(noBody.status).toBe(400);
  });

  it('refuses a template key it does not recognise', async () => {
    const res = await request(app)
      .put('/api/admin/email-templates/invoiceOverdue')
      .send({ subject: 'x', body: 'y' });

    expect(res.status).toBe(404);
  });

  // Nothing is stored when a save is refused, or a half-applied edit would sit
  // there looking accepted.
  it('stores nothing when it refuses', async () => {
    await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Your reset link', body: 'No link here.' });

    const { rows } = await pool.query(`SELECT key FROM admin_settings WHERE key LIKE 'email%'`);
    expect(rows).toHaveLength(0);
  });
});

describe('DELETE /api/admin/email-templates/:key', () => {
  it('restores the built-in copy by forgetting the stored rows', async () => {
    await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Custom', body: VALID_RESET_BODY });

    const res = await request(app).delete('/api/admin/email-templates/passwordReset');
    expect(res.status).toBe(200);

    const listed = await request(app).get('/api/admin/email-templates');
    const reset = listed.body.find((t: { key: string }) => t.key === 'passwordReset');
    expect(reset.subject).toBeNull();
    expect(reset.body).toBeNull();
  });
});

// The point of the whole feature: what is stored is what customers receive.
describe('what a stored template does to the email that gets sent', () => {
  it('is used in place of the default once saved', async () => {
    await request(app)
      .put('/api/admin/email-templates/passwordReset')
      .send({ subject: 'Reset requested', body: VALID_RESET_BODY });

    const { subject, html } = renderTemplate(
      'passwordReset',
      await loadStoredTemplate('passwordReset'),
      { greeting: 'Hi Thom,', resetUrl: 'https://shop.test/r?token=abc' }
    );

    expect(subject).toBe('Reset requested');
    expect(html).toContain('New copy.');
    expect(html).toContain('https://shop.test/r?token=abc');
  });

  it('falls back to the built-in copy when nothing is stored', async () => {
    const { subject, html } = renderTemplate(
      'passwordReset',
      await loadStoredTemplate('passwordReset'),
      { greeting: 'Hi,', resetUrl: 'https://shop.test/r?token=abc' }
    );

    expect(subject).toBe('Reset your Redefined Designs password');
    expect(html).toContain('Choose a new password');
  });

  // Editing the copy must not be able to remove the sentence that explains why
  // the email is lawful to send.
  it('keeps the consent footer on a favorite alert whose body was replaced', async () => {
    await request(app)
      .put('/api/admin/email-templates/favoriteSold')
      .send({ subject: 'Gone', body: 'Sorry, {{itemName}} sold.' });

    const { html } = renderTemplate('favoriteSold', await loadStoredTemplate('favoriteSold'), {
      itemName: 'Oak table',
      siteUrl: 'https://shop.test'
    });

    expect(html).toContain('Sorry, Oak table sold.');
    expect(html).toContain('account page');
  });
});