import { INestApplication } from '@nestjs/common';
import { CreateGrantInput } 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, hasTestDb, uniqueSuffix } from '../testing/test-db';
import { PondsService } from '../ponds/ponds.service';
import { TrashService } from '../trash/trash.service';
import { UsersService } from '../users/users.service';

/**
 * Classification inheritance in the page tree (issue #205, ADR 0022):
 * children inherit, moves can only raise (audited), lowering needs the
 * dedicated capability (pond-wide Pond Admin) and is audited — and no
 * move-like path (reposition, promote-on-trash, promote-on-purge) ever
 * lowers a level as a side effect.
 */
describe.skipIf(!hasTestDb)('classification inheritance (e2e, issue #205)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  const suffix = uniqueSuffix();
  const password = 'vererbte einstufung 123';

  const userIds: Record<string, string> = {};
  const cookies: Record<string, string> = {};
  let pondId: string;

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

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

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

  async function classificationOf(pageId: string): Promise<string> {
    const res = await api()
      .get(`/api/v1/pages/${pageId}`)
      .set('Cookie', cookies.owner!)
      .expect(200);
    return (res.body as { classification: string }).classification;
  }

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

    for (const handle of ['owner', 'editor']) {
      await makeUser(handle);
    }
    await app
      .get(PondsService)
      .ensurePersonalPond(await prisma.user.findUniqueOrThrow({ where: { id: userIds.owner! } }));
    await prisma.quotaOverride.create({
      data: {
        subjectType: 'USER',
        subjectId: userIds.owner!,
        quotaKey: 'additional_ponds',
        value: 10,
      },
    });

    const pond = await api()
      .post('/api/v1/ponds')
      .set('Cookie', cookies.owner!)
      .send({ name: `Inherit Pond ${suffix}` })
      .expect(201);
    pondId = (pond.body as { id: string }).id;

    const editorGrant: CreateGrantInput = {
      subjectType: 'user',
      subjectId: userIds.editor!,
      role: 'editor',
      scopeType: 'pond',
      scopeId: undefined,
      effect: 'allow',
    };
    await api()
      .post(`/api/v1/ponds/${pondId}/grants`)
      .set('Cookie', cookies.owner!)
      .send(editorGrant)
      .expect(201);
  });

  afterAll(async () => {
    const ids = Object.values(userIds);
    await prisma.auditEntry.deleteMany({ where: { actorId: { in: ids } } });
    await prisma.page.deleteMany({ where: { pond: { ownerId: { in: ids } } } });
    await prisma.roleGrant.deleteMany({ where: { pond: { ownerId: { in: ids } } } });
    await prisma.quotaOverride.deleteMany({ where: { subjectId: { in: ids } } });
    await prisma.pond.deleteMany({ where: { ownerId: { in: ids } } });
    await prisma.user.deleteMany({ where: { id: { in: ids } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('any writer may raise; a new page inherits its parent level', async () => {
    const parent = await createPage(`Classified Parent ${suffix}`);
    // The EDITOR raises — raising is ordinary editorial work, no admin needed.
    const raised = await api()
      .patch(`/api/v1/pages/${parent.id}`)
      .set('Cookie', cookies.editor!)
      .send({ classification: 'vs_nfd' })
      .expect(200);
    expect((raised.body as { classification: string }).classification).toBe('vs_nfd');
    const raiseAudit = await prisma.auditEntry.findFirst({
      where: { action: 'page.classification_raised', targetId: parent.id },
    });
    expect(raiseAudit?.actorId).toBe(userIds.editor);
    expect(raiseAudit?.details).toMatchObject({ from: 'unclassified', to: 'vs_nfd' });

    // Inherit on create: the child starts at the parent's level, not the
    // instance default.
    const child = await createPage(`Inherited Child ${suffix}`, parent.id);
    expect(await classificationOf(child.id)).toBe('vs_nfd');
  });

  it('moving under a higher-classified parent raises the whole moved subtree, audited', async () => {
    const top = await createPage(`Secret Top ${suffix}`);
    await api()
      .patch(`/api/v1/pages/${top.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'vs_nfd' })
      .expect(200);

    const movedRoot = await createPage(`Open Subtree ${suffix}`);
    const movedChild = await createPage(`Open Leaf ${suffix}`, movedRoot.id);

    await api()
      .patch(`/api/v1/pages/${movedRoot.id}/position`)
      .set('Cookie', cookies.editor!)
      .send({ afterId: null, beforeId: null, parentId: top.id })
      .expect(200);

    expect(await classificationOf(movedRoot.id)).toBe('vs_nfd');
    expect(await classificationOf(movedChild.id)).toBe('vs_nfd');
    for (const pageId of [movedRoot.id, movedChild.id]) {
      const audit = await prisma.auditEntry.findFirst({
        where: { action: 'page.classification_raised', targetId: pageId },
      });
      expect(audit?.details).toMatchObject({ from: 'unclassified', to: 'vs_nfd', trigger: 'move' });
      expect(audit?.actorId).toBe(userIds.editor);
    }
  });

  it('lowering is denied without the dedicated capability and audited with it', async () => {
    const page = await createPage(`To Lower ${suffix}`);
    await api()
      .patch(`/api/v1/pages/${page.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'vs_nfd' })
      .expect(200);

    // The editor may write the page but holds no pond-admin role → 403.
    const denied = await api()
      .patch(`/api/v1/pages/${page.id}`)
      .set('Cookie', cookies.editor!)
      .send({ classification: 'unclassified' })
      .expect(403);
    expect((denied.body as { code: string }).code).toBe('classification_lower_forbidden');
    expect(await classificationOf(page.id)).toBe('vs_nfd');

    // The owner (Pond Admin) may lower — and the sensitive direction is audited.
    await api()
      .patch(`/api/v1/pages/${page.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'unclassified' })
      .expect(200);
    expect(await classificationOf(page.id)).toBe('unclassified');
    const audit = await prisma.auditEntry.findFirst({
      where: { action: 'page.classification_lowered', targetId: page.id },
    });
    expect(audit?.actorId).toBe(userIds.owner);
    expect(audit?.details).toMatchObject({ from: 'vs_nfd', to: 'unclassified', trigger: 'edit' });
  });

  it('no move-like path lowers as a side effect: reposition, trash-promote, purge-promote', async () => {
    // Moving a classified page under an unclassified parent keeps its level.
    const openParent = await createPage(`Open Parent ${suffix}`);
    const classified = await createPage(`Stays Classified ${suffix}`);
    await api()
      .patch(`/api/v1/pages/${classified.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'vs_nfd' })
      .expect(200);
    await api()
      .patch(`/api/v1/pages/${classified.id}/position`)
      .set('Cookie', cookies.owner!)
      .send({ afterId: null, beforeId: null, parentId: openParent.id })
      .expect(200);
    expect(await classificationOf(classified.id)).toBe('vs_nfd');

    // Trash-promote: trashing the classified middle page re-attaches its
    // classified child to the open grandparent — the child keeps its level.
    const middle = await createPage(`Classified Middle ${suffix}`, openParent.id);
    await api()
      .patch(`/api/v1/pages/${middle.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'vs_nfd' })
      .expect(200);
    const grandchild = await createPage(`Classified Leaf ${suffix}`, middle.id);
    expect(await classificationOf(grandchild.id)).toBe('vs_nfd');
    await api().delete(`/api/v1/pages/${middle.id}`).set('Cookie', cookies.owner!).expect(204);
    const promoted = await prisma.page.findUniqueOrThrow({ where: { id: grandchild.id } });
    expect(promoted.parentId).toBe(openParent.id);
    expect(promoted.classification).toBe('VS_NFD');

    // Purge-promote: a subtree-trashed child still points at its trashed
    // parent; purging the parent promotes it — again without lowering.
    const purgeParent = await createPage(`Purge Parent ${suffix}`, openParent.id);
    await api()
      .patch(`/api/v1/pages/${purgeParent.id}`)
      .set('Cookie', cookies.owner!)
      .send({ classification: 'vs_nfd' })
      .expect(200);
    const purgeChild = await createPage(`Purge Leaf ${suffix}`, purgeParent.id);
    await api()
      .delete(`/api/v1/pages/${purgeParent.id}?mode=subtree`)
      .set('Cookie', cookies.owner!)
      .expect(204);
    const ownerUser = await prisma.user.findUniqueOrThrow({ where: { id: userIds.owner! } });
    await app.get(TrashService).purgeNow(ownerUser, purgeParent.id);
    const promotedAfterPurge = await prisma.page.findUniqueOrThrow({
      where: { id: purgeChild.id },
    });
    expect(promotedAfterPurge.parentId).toBe(openParent.id);
    expect(promotedAfterPurge.classification).toBe('VS_NFD');
  });
});