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

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

/**
 * Delete modes and subtree trash semantics (issue #107): promote vs subtree,
 * the write-on-every-descendant gate, order-independent restore re-attachment,
 * and child promotion on purge.
 */
describe.skipIf(!hasTestDb)('page tree trash semantics (e2e, issue #107)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  const suffix = uniqueSuffix();
  const password = 'branches fall upward 12';

  let ownerCookie: string;
  let editorCookie: string;
  let pondId: string;
  let secretLabelId: string;

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

  async function login(username: string): Promise<string> {
    const res = await api()
      .post('/api/v1/auth/login')
      .send({ usernameOrEmail: username, password })
      .expect(200);
    return sessionCookieOf(res);
  }

  async function createPage(title: string, parentId?: string): Promise<PageView> {
    const res = await api()
      .post(`/api/v1/ponds/${pondId}/pages`)
      .set('Cookie', ownerCookie)
      .send(parentId ? { title, parentId } : { title })
      .expect(201);
    return res.body as PageView;
  }

  async function listPages(): Promise<PageView[]> {
    const res = await api()
      .get(`/api/v1/ponds/${pondId}/pages`)
      .set('Cookie', ownerCookie)
      .expect(200);
    return res.body as PageView[];
  }

  async function trashTitles(): Promise<string[]> {
    const res = await api()
      .get(`/api/v1/ponds/${pondId}/trash`)
      .set('Cookie', ownerCookie)
      .expect(200);
    return (res.body as PageView[]).map((p) => p.title);
  }

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

    const ownerUser = await users.createUser({
      username: `boris-branch-${suffix}`,
      email: `boris-branch-${suffix}@example.org`,
      displayName: 'Boris Branch',
      password,
      locale: 'en',
    });
    await users.markEmailVerified(ownerUser.id);
    const editorUser = await users.createUser({
      username: `edda-editor-${suffix}`,
      email: `edda-editor-${suffix}@example.org`,
      displayName: 'Edda Editor',
      password,
      locale: 'en',
    });
    await users.markEmailVerified(editorUser.id);

    // Pond, labels, and ALL grants provisioned before any permission
    // resolution touches the pond — raw rows created later would be invisible
    // to the warmed PondPermissionCache.
    const pond = await prisma.pond.create({
      data: {
        slug: `tree-trash-${suffix}`,
        name: 'Tree Trash',
        type: 'SHARED',
        ownerId: ownerUser.id,
      },
    });
    pondId = pond.id;
    await grantOwnerAdmin(prisma, pondId, ownerUser.id);
    const secret = await prisma.label.create({
      data: { pondId, name: 'secret', color: '#334455' },
    });
    secretLabelId = secret.id;
    await prisma.roleGrant.createMany({
      data: [
        {
          pondId,
          subjectType: 'USER',
          subjectId: editorUser.id,
          role: 'EDITOR',
          scopeType: 'POND',
          effect: 'ALLOW',
          createdBy: ownerUser.id,
        },
        {
          pondId,
          subjectType: 'USER',
          subjectId: editorUser.id,
          role: 'EDITOR',
          scopeType: 'LABEL',
          scopeId: secret.id,
          effect: 'DENY',
          createdBy: ownerUser.id,
        },
      ],
    });

    ownerCookie = await login(`boris-branch-${suffix}`);
    editorCookie = await login(`edda-editor-${suffix}`);
  });

  afterAll(async () => {
    await prisma.roleGrant.deleteMany({ where: { pondId } });
    await prisma.label.deleteMany({ where: { pondId } });
    await prisma.page.deleteMany({ where: { pondId } });
    await prisma.pond.deleteMany({ where: { id: pondId } });
    await prisma.user.deleteMany({ where: { username: { contains: suffix } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('promote (the default) re-attaches live children to the deleted page parent', async () => {
    const a = await createPage('Promote A');
    const b = await createPage('Promote B', a.id);
    const c = await createPage('Promote C', b.id);

    await api().delete(`/api/v1/pages/${a.id}`).set('Cookie', ownerCookie).expect(204);

    const pages = await listPages();
    expect(pages.find((p) => p.id === b.id)?.parentId).toBeNull(); // promoted to A's parent
    expect(pages.find((p) => p.id === c.id)?.parentId).toBe(b.id); // untouched
    expect(await trashTitles()).toContain('Promote A');

    // Restoring A later does not re-claim the promoted children.
    await api().post(`/api/v1/pages/${a.id}/restore`).set('Cookie', ownerCookie).expect(201);
    const after = await listPages();
    expect(after.find((p) => p.id === b.id)?.parentId).toBeNull();
  });

  it('subtree trashes every live descendant together; restore is order-independent', async () => {
    const x = await createPage('Subtree X');
    const y = await createPage('Subtree Y', x.id);
    const z = await createPage('Subtree Z', y.id);

    await api().delete(`/api/v1/pages/${x.id}?mode=subtree`).set('Cookie', ownerCookie).expect(204);
    const titles = await trashTitles();
    expect(titles).toEqual(expect.arrayContaining(['Subtree X', 'Subtree Y', 'Subtree Z']));

    // One shared timestamp marks the subtree operation.
    const rows = await prisma.page.findMany({ where: { id: { in: [x.id, y.id, z.id] } } });
    const stamps = new Set(rows.map((r) => r.deletedAt?.toISOString()));
    expect(stamps.size).toBe(1);

    // Restore the deepest page first: its ancestors are still trashed, so it
    // re-attaches to the nearest live ancestor — the root.
    const zRestored = await api()
      .post(`/api/v1/pages/${z.id}/restore`)
      .set('Cookie', ownerCookie)
      .expect(201);
    expect((zRestored.body as PageView).parentId).toBeNull();

    // Restore the top, then the middle: Y finds X live again and nests under it.
    await api().post(`/api/v1/pages/${x.id}/restore`).set('Cookie', ownerCookie).expect(201);
    const yRestored = await api()
      .post(`/api/v1/pages/${y.id}/restore`)
      .set('Cookie', ownerCookie)
      .expect(201);
    expect((yRestored.body as PageView).parentId).toBe(x.id);

    // Z stays where its restore put it — X does not re-claim it.
    const pages = await listPages();
    expect(pages.find((p) => p.id === z.id)?.parentId).toBeNull();
  });

  it('subtree requires write on every live descendant (403, nothing deleted)', async () => {
    const parent = await createPage('Gate parent');
    const child = await createPage('Gate child', parent.id);
    await prisma.pageLabel.create({ data: { pageId: child.id, labelId: secretLabelId } });

    await api()
      .delete(`/api/v1/pages/${parent.id}?mode=subtree`)
      .set('Cookie', editorCookie)
      .expect(403);

    // Nothing was trashed by the refused subtree delete.
    const pages = await listPages();
    expect(pages.some((p) => p.id === parent.id)).toBe(true);
    expect(pages.some((p) => p.id === child.id)).toBe(true);

    // The plain promote delete only needs write on the page itself.
    await api().delete(`/api/v1/pages/${parent.id}`).set('Cookie', editorCookie).expect(204);
  });

  it('purging a parent promotes its children instead of orphaning them', async () => {
    const u = await createPage('Purge U');
    const v = await createPage('Purge V', u.id);

    await api().delete(`/api/v1/pages/${u.id}?mode=subtree`).set('Cookie', ownerCookie).expect(204);
    await api().delete(`/api/v1/pages/${u.id}/purge`).set('Cookie', ownerCookie).expect(204);

    const vRow = await prisma.page.findUniqueOrThrow({ where: { id: v.id } });
    expect(vRow.parentId).toBeNull(); // U's parent was the root
    const restored = await api()
      .post(`/api/v1/pages/${v.id}/restore`)
      .set('Cookie', ownerCookie)
      .expect(201);
    expect((restored.body as PageView).parentId).toBeNull();
  });
});