import { randomUUID } from 'node:crypto';

import { INestApplication } from '@nestjs/common';
import type { CommentView, PageCommentsView } from '@dorfteich/shared';
import { PrismaClient, User } from '@prisma/client';
import request from 'supertest';
import * as Y from 'yjs';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';

import { createTestApp, sessionCookieOf } from '../testing/test-app';
import { createTestPrisma, hasTestDb, uniqueSuffix } from '../testing/test-db';
import { UsersService } from '../users/users.service';

/**
 * Threaded page comments end to end (issue #91): CRUD with the permission
 * matrix and the pond's comment policy, resolve semantics with the
 * default-collapsed list response, the shared escaping pipeline, and the
 * trash/purge behavior.
 */
describe.skipIf(!hasTestDb)('comments (e2e, issue #91)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  const suffix = uniqueSuffix();
  const password = 'kommentare sind gespraech 1';
  const users: Record<string, User> = {};
  const cookies: Record<string, string> = {};
  let pondId: string;
  let pageId: string;

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

  async function makeUser(handle: string): Promise<void> {
    const service = app.get(UsersService);
    const username = `cm-${handle}-${suffix}`;
    const user = await service.createUser({
      username,
      email: `${username}@example.org`,
      displayName: `Cm ${handle}`,
      password,
      locale: 'en',
    });
    await service.markEmailVerified(user.id);
    users[handle] = user;
    cookies[handle] = sessionCookieOf(
      await api()
        .post('/api/v1/auth/login')
        .send({ usernameOrEmail: username, password })
        .expect(200),
    );
  }

  async function makePage(slug: string): Promise<string> {
    const id = randomUUID();
    await prisma.page.create({
      data: {
        id,
        pondId,
        title: slug,
        slug,
        ydocState: new Uint8Array(Y.encodeStateAsUpdate(new Y.Doc())),
        sortKey: `a${slug}`,
        createdBy: users.owner!.id,
      },
    });
    return id;
  }

  async function grant(handle: string, role: 'EDITOR' | 'READER'): Promise<void> {
    await prisma.roleGrant.create({
      data: {
        pondId,
        subjectType: 'USER',
        subjectId: users[handle]!.id,
        role,
        scopeType: 'POND',
        effect: 'ALLOW',
        createdBy: users.owner!.id,
      },
    });
  }

  async function setPolicy(policy: 'readers' | 'editors'): Promise<void> {
    const pond = await prisma.pond.findUniqueOrThrow({ where: { id: pondId } });
    await prisma.pond.update({
      where: { id: pondId },
      data: { settings: { ...(pond.settings as object), commentPolicy: policy } },
    });
  }

  beforeAll(async () => {
    prisma = createTestPrisma();
    await prisma.rateLimit.deleteMany({});
    app = await createTestApp();
    for (const handle of ['owner', 'editor', 'reader', 'outsider']) await makeUser(handle);

    const pond = await prisma.pond.create({
      data: {
        slug: `cm-pond-${suffix}`,
        name: 'Comment Pond',
        type: 'SHARED',
        ownerId: users.owner!.id,
      },
    });
    pondId = pond.id;
    await prisma.roleGrant.create({
      data: {
        pondId,
        subjectType: 'USER',
        subjectId: users.owner!.id,
        role: 'POND_ADMIN',
        scopeType: 'POND',
        effect: 'ALLOW',
        createdBy: users.owner!.id,
      },
    });
    await grant('editor', 'EDITOR');
    await grant('reader', 'READER');
    pageId = await makePage('discussion');
  });

  afterAll(async () => {
    const ids = Object.values(users).map((u) => u.id);
    await prisma.comment.deleteMany({ where: { page: { pondId } } });
    await prisma.roleGrant.deleteMany({ where: { pondId } });
    await prisma.page.deleteMany({ where: { pondId } });
    await prisma.pond.deleteMany({ where: { id: pondId } });
    await prisma.auditEntry.deleteMany({ where: { actorId: { in: ids } } });
    await prisma.session.deleteMany({ where: { userId: { in: ids } } });
    await prisma.userIdentity.deleteMany({ where: { userId: { in: ids } } });
    await prisma.user.deleteMany({ where: { id: { in: ids } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('runs thread CRUD under the permission matrix (readers policy)', async () => {
    // Reader may comment when the policy allows readers (the default).
    const rootRes = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'A **question** from a reader', anchor: 'para-1' })
      .expect(201);
    const root = rootRes.body as CommentView;
    expect(root.html).toContain('<strong>question</strong>');
    expect(root.anchor).toBe('para-1');

    // Editor replies; the reply refuses to carry an anchor.
    const replyRes = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.editor!)
      .send({ body: 'An answer', parentId: root.id, anchor: 'ignored' })
      .expect(201);
    expect((replyRes.body as CommentView).anchor).toBeNull();

    // Replies to replies are rejected.
    await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'nested', parentId: (replyRes.body as CommentView).id })
      .expect(400);

    // The outsider sees nothing at all — 404, not 403 (issue #60).
    await api()
      .get(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.outsider!)
      .expect(404);
    await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.outsider!)
      .send({ body: 'sneaky' })
      .expect(404);

    // Edit: only the author.
    await api()
      .patch(`/api/v1/comments/${root.id}`)
      .set('Cookie', cookies.editor!)
      .send({ body: 'hijacked' })
      .expect(403);
    const edited = await api()
      .patch(`/api/v1/comments/${root.id}`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'A *clarified* question' })
      .expect(200);
    expect((edited.body as CommentView).editedAt).not.toBeNull();

    // Delete: the author cannot take replies down with the root …
    await api().delete(`/api/v1/comments/${root.id}`).set('Cookie', cookies.reader!).expect(409);
    // … but a pond admin can delete any thread (cascade).
    await api().delete(`/api/v1/comments/${root.id}`).set('Cookie', cookies.owner!).expect(204);
    const after = await api()
      .get(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .expect(200);
    expect((after.body as PageCommentsView).threads).toHaveLength(0);
  });

  it('enforces the editors-only policy', async () => {
    // Through the real pond PATCH — guards the settings merge in
    // PondsService.update (a silently dropped commentPolicy broke the UI
    // pack during #92).
    await api()
      .patch(`/api/v1/ponds/${pondId}`)
      .set('Cookie', cookies.owner!)
      .send({ commentPolicy: 'editors' })
      .expect(200);
    await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'readers barred' })
      .expect(403);
    const res = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.editor!)
      .send({ body: 'editors pass' })
      .expect(201);
    // Reading stays open to readers regardless of the write policy.
    await api().get(`/api/v1/pages/${pageId}/comments`).set('Cookie', cookies.reader!).expect(200);
    // Resolve follows the same policy: readers barred, editors allowed.
    await api()
      .post(`/api/v1/comments/${(res.body as CommentView).id}/resolve`)
      .set('Cookie', cookies.reader!)
      .expect(403);
    await api()
      .post(`/api/v1/comments/${(res.body as CommentView).id}/resolve`)
      .set('Cookie', cookies.editor!)
      .expect(201);
    await api()
      .delete(`/api/v1/comments/${(res.body as CommentView).id}`)
      .set('Cookie', cookies.editor!)
      .expect(204);
    await setPolicy('readers');
  });

  it('filters resolved threads and collapses them by default', async () => {
    const open = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'still open' })
      .expect(201);
    const done = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'done soon' })
      .expect(201);
    await api()
      .post(`/api/v1/comments/${(done.body as CommentView).id}/resolve`)
      .set('Cookie', cookies.reader!)
      .expect(201);

    const all = (
      await api().get(`/api/v1/pages/${pageId}/comments`).set('Cookie', cookies.reader!).expect(200)
    ).body as PageCommentsView;
    expect(all.openCount).toBe(1);
    expect(all.resolvedCount).toBe(1);
    const resolvedThread = all.threads.find((t) => t.resolved)!;
    expect(resolvedThread.collapsed).toBe(true);
    expect(all.threads.find((t) => !t.resolved)!.collapsed).toBe(false);

    const onlyOpen = (
      await api()
        .get(`/api/v1/pages/${pageId}/comments?filter=open`)
        .set('Cookie', cookies.reader!)
        .expect(200)
    ).body as PageCommentsView;
    expect(onlyOpen.threads).toHaveLength(1);
    expect(onlyOpen.threads[0]?.root.body).toBe('still open');

    // Unresolve re-opens the thread.
    await api()
      .delete(`/api/v1/comments/${(done.body as CommentView).id}/resolve`)
      .set('Cookie', cookies.reader!)
      .expect(200);
    const reopened = (
      await api()
        .get(`/api/v1/pages/${pageId}/comments?filter=resolved`)
        .set('Cookie', cookies.reader!)
        .expect(200)
    ).body as PageCommentsView;
    expect(reopened.threads).toHaveLength(0);

    // Cleanup for the next test.
    await api()
      .delete(`/api/v1/comments/${(open.body as CommentView).id}`)
      .set('Cookie', cookies.owner!);
    await api()
      .delete(`/api/v1/comments/${(done.body as CommentView).id}`)
      .set('Cookie', cookies.owner!);
  });

  it('renders bodies through the shared escaping pipeline', async () => {
    const res = await api()
      .post(`/api/v1/pages/${pageId}/comments`)
      .set('Cookie', cookies.reader!)
      .send({ body: 'look <script>alert(1)</script> <img src=x onerror=alert(2)>' })
      .expect(201);
    const view = res.body as CommentView;
    // Smuggled markup arrives as escaped, inert text — assert the escaped
    // form is present, never `not.toContain` on words inside it (#82 lesson).
    expect(view.html).toContain('&lt;script&gt;');
    expect(view.html).not.toContain('<script>');
    expect(view.html).not.toContain('<img');
    await api().delete(`/api/v1/comments/${view.id}`).set('Cookie', cookies.owner!).expect(204);
  });

  it('hides comments with the trashed page and removes them on purge', async () => {
    const page2 = await makePage('doomed');
    const created = await api()
      .post(`/api/v1/pages/${page2}/comments`)
      .set('Cookie', cookies.editor!)
      .send({ body: 'about to vanish' })
      .expect(201);

    await prisma.page.update({
      where: { id: page2 },
      data: { deletedAt: new Date(), deletedBy: users.owner!.id },
    });
    // Trash hides: the list 404s, and so does every comment mutation.
    await api().get(`/api/v1/pages/${page2}/comments`).set('Cookie', cookies.editor!).expect(404);
    await api()
      .patch(`/api/v1/comments/${(created.body as CommentView).id}`)
      .set('Cookie', cookies.editor!)
      .send({ body: 'necromancy' })
      .expect(404);

    // Purge removes the rows (FK cascade).
    await prisma.page.delete({ where: { id: page2 } });
    expect(await prisma.comment.count({ where: { pageId: page2 } })).toBe(0);
  });
});