import { strict as assert } from 'node:assert';
import { readFile, rm } from 'node:fs/promises';
import path from 'node:path';
import { afterEach, beforeEach, describe, it } from 'node:test';
import type { FastifyInstance } from 'fastify';
import { SESSION_COOKIE, createSessionToken, csrfToken } from '../src/auth.ts';
import { parseSiteConfig } from '../src/config.ts';
import { ICON_URL, IdentityError, IdentityStore, sanitiseIcon } from '../src/storage/identity.ts';
import { buildApp } from '../src/server.ts';
import { FakePipeline, tempDir } from './support/harness.ts';

const BRAND = { name: 'Hops n Grains', tagline: 'Handcrafted Microbrewery', logo: '/assets/favicon.svg' };
const SECRET = 'identity-test-secret';
const SVG = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 10"><rect width="10" height="10"/></svg>';

let dataDir: string;

beforeEach(async () => {
  dataDir = await tempDir('identity');
});

afterEach(async () => {
  await rm(dataDir, { recursive: true, force: true });
});

function config() {
  return parseSiteConfig({
    site: 'menu.example.test',
    brand: BRAND,
    sections: [{ slug: 'bar', label: 'Bar', order: 1 }],
  });
}

async function loaded() {
  const store = new IdentityStore({ dataDir, seed: { ...BRAND } });
  await store.load();
  return store;
}

describe('sanitiseIcon', () => {
  it('strips script, event handlers and remote references but keeps the drawing', () => {
    const dirty = `<svg xmlns="http://www.w3.org/2000/svg" onload="alert(1)">
      <script>alert('x')</script>
      <foreignObject><body xmlns="http://www.w3.org/1999/xhtml">hi</body></foreignObject>
      <a href="javascript:alert(2)"><rect width="4" height="4" onclick="alert(3)"/></a>
      <style>rect{fill:red}</style>
    </svg>`;
    const clean = sanitiseIcon(dirty);
    assert.doesNotMatch(clean, /script/i);
    assert.doesNotMatch(clean, /onload|onclick/i);
    assert.doesNotMatch(clean, /foreignObject/i);
    assert.doesNotMatch(clean, /javascript:/i);
    assert.doesNotMatch(clean, /<style/i);
    assert.match(clean, /<rect width="4" height="4"\/>/);
  });
});

describe('IdentityStore', () => {
  it('seeds from the config the first time and writes the file', async () => {
    const store = await loaded();
    assert.deepEqual(store.view(), { name: BRAND.name, tagline: BRAND.tagline, showDates: true, hasIcon: false });
    const file = JSON.parse(await readFile(path.join(dataDir, 'site.json'), 'utf8'));
    assert.equal(file.name, BRAND.name);
  });

  it('changes the name, tagline and date switch without touching the config', async () => {
    const store = await loaded();
    const updated = await store.update({ name: '  Hops   and Grains ', tagline: '', showDates: false });
    assert.deepEqual(updated, { name: 'Hops and Grains', tagline: null, showDates: false, hasIcon: false });

    const applied = store.apply(config());
    assert.equal(applied.brand.name, 'Hops and Grains');
    assert.equal(applied.brand.tagline, null);
    assert.equal(applied.display.showDates, false);
    assert.equal(config().brand.name, 'Hops n Grains', 'the config is only the seed');
  });

  it('rejects an empty name', async () => {
    const store = await loaded();
    await assert.rejects(() => store.update({ name: '   ' }), IdentityError);
  });

  it('takes an uploaded icon and points the Site at it', async () => {
    const store = await loaded();
    await store.putIcon(Buffer.from(SVG));
    assert.equal(store.view().hasIcon, true);
    assert.equal(store.apply(config()).brand.logo, ICON_URL);
    assert.match(await readFile(store.iconPath(), 'utf8'), /<svg/);
  });

  it('refuses anything that is not a usable SVG', async () => {
    const store = await loaded();
    await assert.rejects(() => store.putIcon(Buffer.alloc(0)), IdentityError);
    await assert.rejects(() => store.putIcon(Buffer.from('a PNG, honest')), IdentityError);
    await assert.rejects(() => store.putIcon(Buffer.from('<svg>')), IdentityError);
    await assert.rejects(() => store.putIcon(Buffer.alloc(300 * 1024, 32)), IdentityError);
    assert.equal(store.view().hasIcon, false);
  });

  it('forgets the icon on request and falls back to the bundled mark', async () => {
    const store = await loaded();
    await store.putIcon(Buffer.from(SVG));
    await store.removeIcon();
    assert.equal(store.view().hasIcon, false);
    assert.equal(store.apply(config()).brand.logo, '/assets/favicon.svg');
  });
});

describe('identity through the app', () => {
  let app: FastifyInstance;
  let session: string;
  let csrf: string;

  beforeEach(async () => {
    app = await buildApp({
      config: config(),
      dataDir,
      sessionSecret: SECRET,
      adminPasswordHash: null,
      assetsDir: path.join(import.meta.dirname, '..', 'public'),
      secureCookies: false,
      logLevel: 'silent',
      pipeline: new FakePipeline(),
    });
    await app.ready();
    session = createSessionToken(SECRET, 60 * 60 * 1000, new Date());
    csrf = csrfToken(session, SECRET);
  });

  afterEach(async () => {
    await app.close();
  });

  const cookies = () => ({ [SESSION_COOKIE]: session });

  async function iconBody(token: string, filename: string, data: Buffer) {
    const boundary = '----iconboundary';
    const payload = Buffer.concat([
      Buffer.from(`--${boundary}\r\nContent-Disposition: form-data; name="csrf"\r\n\r\n${token}\r\n`),
      Buffer.from(
        `--${boundary}\r\nContent-Disposition: form-data; name="icon"; filename="${filename}"\r\nContent-Type: image/svg+xml\r\n\r\n`,
      ),
      data,
      Buffer.from(`\r\n--${boundary}--\r\n`),
    ]);
    return app.inject({
      method: 'POST',
      url: '/admin/identity/icon',
      cookies: cookies(),
      headers: {
        'content-type': `multipart/form-data; boundary=${boundary}`,
        referer: '/admin',
      },
      payload,
    });
  }

  it('renames the restaurant and hides the dates on the customer pages', async () => {
    await app.menu.identity.update({ name: 'Hops and Grains', showDates: false });

    const landing = await app.inject({ method: 'GET', url: '/' });
    assert.match(landing.body, /Hops and Grains/);

    const barSection = await app.inject({ method: 'GET', url: '/bar/' });
    assert.equal(barSection.statusCode, 404, 'no menu published yet in this fixture');

    // With a menu published, the heading loses its date line but keeps its name.
    const set = await app.menu.store.create('bar', { label: 'Bar Menu' });
    await app.menu.store.addPage(set.id, { data: Buffer.from('x'), originalName: 'a.jpg' });
    await app.menu.store.publish(set.id);

    const published = await app.inject({ method: 'GET', url: '/bar/' });
    assert.match(published.body, /section-heading__label/);
    assert.doesNotMatch(published.body, /section-heading__date/);
  });

  it('shows the date when the switch is on', async () => {
    const set = await app.menu.store.create('bar', { label: 'Bar Menu' });
    await app.menu.store.addPage(set.id, { data: Buffer.from('x'), originalName: 'a.jpg' });
    await app.menu.store.publish(set.id);

    const published = await app.inject({ method: 'GET', url: '/bar/' });
    assert.match(published.body, /section-heading__date/);
  });

  it('accepts an SVG icon, serves it with a locked-down policy, and drops it again', async () => {
    assert.equal((await app.inject({ method: 'GET', url: ICON_URL })).statusCode, 404);

    const uploaded = await iconBody(csrf, 'mark.svg', Buffer.from(SVG));
    assert.equal(uploaded.statusCode, 303);

    const icon = await app.inject({ method: 'GET', url: ICON_URL });
    assert.equal(icon.statusCode, 200);
    assert.match(String(icon.headers['content-type']), /image\/svg\+xml/);
    assert.match(String(icon.headers['content-security-policy']), /default-src 'none'/);
    assert.match(icon.body, /<svg/);

    const landing = await app.inject({ method: 'GET', url: '/' });
    assert.match(landing.body, new RegExp(ICON_URL.replace('/', '\\/')));

    const removed = await app.inject({
      method: 'POST',
      url: '/admin/identity/icon/delete',
      cookies: cookies(),
      headers: { 'x-csrf': csrf, referer: '/admin' },
    });
    assert.equal(removed.statusCode, 303);
    assert.equal((await app.inject({ method: 'GET', url: ICON_URL })).statusCode, 404);
  });

  it('refuses an icon that is not an SVG, and refuses one with no token', async () => {
    const notSvg = await iconBody(csrf, 'photo.jpg', Buffer.from('just a jpeg'));
    assert.match(String(notSvg.headers['location']), /error=/);
    assert.equal((await app.inject({ method: 'GET', url: ICON_URL })).statusCode, 404);

    const noToken = await iconBody('nonsense', 'mark.svg', Buffer.from(SVG));
    assert.equal(noToken.statusCode, 403);
  });

  it('needs a token to change the identity', async () => {
    const response = await app.inject({
      method: 'POST',
      url: '/admin/identity',
      cookies: cookies(),
      headers: { 'content-type': 'application/x-www-form-urlencoded' },
      payload: 'name=Hijacked',
    });
    assert.equal(response.statusCode, 403);
    assert.equal(app.menu.identity.view().name, BRAND.name);
  });
});