import { INestApplication } from '@nestjs/common';
import { PondArchiveManifest } from '@dorfteich/shared';
import { PrismaClient } from '@prisma/client';
import { unzipSync } from 'fflate';
import request from 'supertest';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';

import { AuthTokensService } from '../auth/auth-tokens.service';
import { FilesService } from '../files/files.service';
import { createTestApp, sessionCookieOf } from '../testing/test-app';
import { createTestPrisma, deletePondsWhere, hasTestDb, uniqueSuffix } from '../testing/test-db';
import { UsersService } from '../users/users.service';

const PNG_BASE64 =
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==';

function entries(buffer: Buffer): Record<string, Uint8Array> {
  return unzipSync(new Uint8Array(buffer));
}

/** supertest parses text by default — a ZIP has to be collected as bytes. */
function asBinary(req: request.Test): request.Test {
  return req.parse((res, cb) => {
    const chunks: Buffer[] = [];
    res.on('data', (chunk: Buffer) => chunks.push(chunk));
    res.on('end', () => cb(null, Buffer.concat(chunks)));
  });
}

function manifestOf(buffer: Buffer): PondArchiveManifest {
  const raw = entries(buffer)['manifest.json'];
  return JSON.parse(Buffer.from(raw!).toString('utf8')) as PondArchiveManifest;
}

/**
 * The full pond archive (issue #305). What separates it from the Markdown
 * export is exactly what is asserted here: EVERY attachment travels, not only
 * the embedded ones, and the manifest carries what Markdown cannot — settings,
 * labels, comments and the hierarchy.
 */
describe.skipIf(!hasTestDb)('pond archive (e2e, issue #305)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  let files: FilesService;
  const suffix = uniqueSuffix();
  const password = 'archiviere den ganzen teich 1';
  const owner = { username: `arch-${suffix}` };
  const admin = { username: `archadm-${suffix}` };
  let ownerId: string;
  let ownerCookie: string;
  let adminCookie: string;
  let pondId: string;
  let parentPageId: string;

  const api = () => request(app.getHttpServer());

  beforeAll(async () => {
    prisma = createTestPrisma();
    await prisma.rateLimit.deleteMany({});
    app = await createTestApp();
    files = app.get(FilesService);
    const users = app.get(UsersService);
    const tokens = app.get(AuthTokensService);

    const ownerUser = await users.createUser({
      username: owner.username,
      email: `${owner.username}@example.org`,
      displayName: `Archive Owner ${suffix}`,
      password,
      locale: 'en',
    });
    ownerId = ownerUser.id;
    await api()
      .post('/api/v1/auth/verify-email')
      .send({ token: await tokens.issue(ownerUser.id, 'EMAIL_VERIFICATION', 600) })
      .expect(204);
    ownerCookie = sessionCookieOf(
      await api()
        .post('/api/v1/auth/login')
        .send({ usernameOrEmail: owner.username, password })
        .expect(200),
    );

    const adminUser = await users.createUser({
      username: admin.username,
      email: `${admin.username}@example.org`,
      displayName: `Archive Admin ${suffix}`,
      password,
      locale: 'en',
    });
    await users.markEmailVerified(adminUser.id);
    await prisma.user.update({ where: { id: adminUser.id }, data: { isSiteAdmin: true } });
    adminCookie = sessionCookieOf(
      await api()
        .post('/api/v1/auth/login')
        .send({ usernameOrEmail: admin.username, password })
        .expect(200),
    );

    pondId = (await prisma.pond.findFirstOrThrow({ where: { ownerId, type: 'PERSONAL' } })).id;

    // A parent and a child page, so the hierarchy has something to state.
    const parent = await prisma.page.create({
      data: {
        pondId,
        title: 'Archive Parent',
        slug: 'archive-parent',
        ydocState: new Uint8Array(),
        sortKey: 'a',
        createdBy: ownerId,
        contentCache: {
          create: { plainText: 'Parent body', markdown: 'Parent body', html: '', outline: [] },
        },
      },
    });
    parentPageId = parent.id;
    await prisma.page.create({
      data: {
        pondId,
        parentId: parent.id,
        title: 'Archive Child',
        slug: 'archive-child',
        ydocState: new Uint8Array(),
        sortKey: 'b',
        createdBy: ownerId,
        contentCache: {
          create: { plainText: 'Child body', markdown: 'Child body', html: '', outline: [] },
        },
      },
    });

    const label = await prisma.label.create({
      data: { pondId, name: `Archive Label ${suffix}`, color: '#2f6f4f' },
    });
    await prisma.pageLabel.create({ data: { pageId: parent.id, labelId: label.id } });
    await prisma.comment.create({
      data: { pageId: parent.id, authorId: ownerId, body: 'A remark worth keeping.' },
    });
  });

  afterAll(async () => {
    const where = { pond: { owner: { username: { contains: suffix } } } };
    await prisma.comment.deleteMany({ where: { page: where } });
    await prisma.attachment.deleteMany({ where });
    await prisma.pageLabel.deleteMany({ where: { page: where } });
    await prisma.label.deleteMany({ where });
    await prisma.page.deleteMany({ where });
    await prisma.roleGrant.deleteMany({ where });
    await deletePondsWhere(prisma, { owner: { username: { contains: suffix } } });
    await prisma.user.deleteMany({ where: { username: { contains: suffix } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('contains EVERY attachment, not only the embedded ones', async () => {
    // The gap this whole issue exists for: an attachment nobody embedded
    // would vanish unnoticed with the Markdown export.
    const orphan = await files.upload({ id: ownerId } as never, pondId, {
      buffer: Buffer.from(PNG_BASE64, 'base64'),
      size: 70,
      originalname: 'never-embedded.png',
    } as never);

    const res = await asBinary(api().get(`/api/v1/ponds/${pondId}/archive`))
      .set('Cookie', ownerCookie)
      .expect(200);
    expect(res.headers['content-type']).toContain('application/zip');

    const names = Object.keys(entries(res.body as Buffer));
    expect(names).toContain('manifest.json');
    expect(names).toContain('README.txt');
    expect(names).toContain('pages/archive-parent.md');
    expect(names).toContain('pages/archive-child.md');
    expect(names.some((name) => name.startsWith(`media/${orphan.id}.`))).toBe(true);

    const manifest = manifestOf(res.body as Buffer);
    expect(manifest.attachments.map((a) => a.id)).toContain(orphan.id);
    // The Markdown export would have shipped no media at all here.
    expect(manifest.attachments.length).toBeGreaterThan(0);
  });

  it('states the hierarchy, labels, comments and settings in the manifest', async () => {
    const res = await asBinary(api().get(`/api/v1/ponds/${pondId}/archive`))
      .set('Cookie', ownerCookie)
      .expect(200);
    const manifest = manifestOf(res.body as Buffer);

    expect(manifest.kind).toBe('dorfteich-pond-archive');
    expect(manifest.formatVersion).toBe(1);
    expect(manifest.complete).toBe(true);
    expect(manifest.omittedPages).toBe(0);

    const child = manifest.pages.find((page) => page.slug === 'archive-child');
    // The hierarchy is exactly what a folder of Markdown cannot express.
    expect(child?.parentId).toBe(parentPageId);

    expect(manifest.labels.some((label) => label.name.includes(suffix))).toBe(true);
    expect(manifest.comments.map((comment) => comment.body)).toContain('A remark worth keeping.');
    // A display name, not an account id — the archive outlives the account.
    expect(manifest.comments[0]?.author).toContain('Archive Owner');
    // Pond settings ride along; fonts are always present through the schema
    // defaults, so their presence proves the settings object is real.
    expect(manifest.pond.settings).toHaveProperty('fonts');
  });

  it('tells a requester before the download how much they would get', async () => {
    const preview = await api()
      .get(`/api/v1/ponds/${pondId}/archive/preview`)
      .set('Cookie', ownerCookie)
      .expect(200);
    expect(preview.body.omittedPages).toBe(0);
    expect(preview.body.includedPages).toBe(preview.body.totalPages);
    expect(preview.body.complete).toBe(true);
  });

  it('audits the download with counts and completeness', async () => {
    await asBinary(api().get(`/api/v1/ponds/${pondId}/archive`))
      .set('Cookie', ownerCookie)
      .expect(200);
    const entry = await prisma.auditEntry.findFirst({
      where: { action: 'pond.archived', targetId: pondId },
      orderBy: { at: 'desc' },
    });
    expect(entry).not.toBeNull();
    expect(entry!.details).toMatchObject({ complete: true, omittedPages: 0 });
  });

  it('gives the Site Admin a complete archive without pond membership', async () => {
    // The purge dialog's archive must not depend on which ponds the operator
    // happens to be a member of — this admin is a member of none.
    const preview = await api()
      .get(`/api/v1/admin/trash/ponds/${pondId}/archive/preview`)
      .set('Cookie', adminCookie)
      .expect(200);
    expect(preview.body.complete).toBe(true);
    expect(preview.body.omittedPages).toBe(0);

    const res = await asBinary(api().get(`/api/v1/admin/trash/ponds/${pondId}/archive`))
      .set('Cookie', adminCookie)
      .expect(200);
    expect(manifestOf(res.body as Buffer).pages.length).toBe(preview.body.totalPages);
  });

  it('keeps the admin archive away from an ordinary pond admin', async () => {
    await api()
      .get(`/api/v1/admin/trash/ponds/${pondId}/archive`)
      .set('Cookie', ownerCookie)
      .expect(403);
  });
});