import { INestApplication } from '@nestjs/common';
import * as bcrypt from 'bcryptjs';
import request from 'supertest';
import { App } from 'supertest/types';
import { PrismaService } from '../src/prisma/prisma.service';
import { createTestApp } from './utils/create-test-app';
import { login } from './utils/api';
import { drainDomainEvents } from './utils/domain-events';

interface TaskBody {
  id: string;
  status: string;
  completedAt: string | null;
  dueDate: string | null;
}

describe('Tasks (e2e)', () => {
  let app: INestApplication<App>;
  let prisma: PrismaService;
  const staffEmail = `tasks-e2e-staff-${Date.now()}@example.com`;
  const readonlyEmail = `tasks-e2e-readonly-${Date.now()}@example.com`;
  const password = 'SuperSecret123!';
  let staffId: string;
  let readonlyId: string;
  let staffToken: string;
  let readonlyToken: string;
  let taskId: string;
  const taskIds: string[] = [];

  const eventsOf = (id: string, type: string) =>
    prisma.domainEvent.findMany({
      where: { aggregateType: 'Task', aggregateId: id, type },
      include: { deliveries: true },
    });

  beforeAll(async () => {
    app = await createTestApp();
    prisma = app.get(PrismaService);

    const passwordHash = await bcrypt.hash(password, 12);
    const staff = await prisma.user.create({
      data: {
        email: staffEmail,
        passwordHash,
        name: 'Staff',
        role: { connect: { key: 'STAFF' } },
      },
    });
    staffId = staff.id;
    const readonly = await prisma.user.create({
      data: {
        email: readonlyEmail,
        passwordHash,
        name: 'Readonly',
        role: { connect: { key: 'READONLY' } },
      },
    });
    readonlyId = readonly.id;
    staffToken = (await login(app, staffEmail, password)).accessToken;
    readonlyToken = (await login(app, readonlyEmail, password)).accessToken;
  });

  afterAll(async () => {
    // Deliveries go with their event (ON DELETE CASCADE).
    await prisma.domainEvent.deleteMany({
      where: { aggregateType: 'Task', aggregateId: { in: taskIds } },
    });
    await prisma.task.deleteMany({ where: { id: { in: taskIds } } });
    await prisma.refreshToken.deleteMany({
      where: { userId: { in: [staffId, readonlyId] } },
    });
    await prisma.auditLog.deleteMany({
      where: { userId: { in: [staffId, readonlyId] } },
    });
    await prisma.user.deleteMany({
      where: { id: { in: [staffId, readonlyId] } },
    });
    await app.close();
  });

  it('rejects create for a READONLY user', () => {
    return request(app.getHttpServer())
      .post('/api/v1/tasks')
      .set('Authorization', `Bearer ${readonlyToken}`)
      .send({ title: 'Beute prüfen' })
      .expect(403);
  });

  it('lets a STAFF user create a task', async () => {
    const response = await request(app.getHttpServer())
      .post('/api/v1/tasks')
      .set('Authorization', `Bearer ${staffToken}`)
      .send({ title: 'Beute prüfen', priority: 'HIGH' })
      .expect(201);
    const task = response.body as TaskBody;
    taskId = task.id;
    taskIds.push(taskId);
    expect(task.status).toBe('OPEN');
  });

  it('POST /tasks leaves a TaskCreated event whose calendar and webhook deliveries are DONE after draining', async () => {
    const response = await request(app.getHttpServer())
      .post('/api/v1/tasks')
      .set('Authorization', `Bearer ${staffToken}`)
      .send({ title: 'Mit Termin', dueDate: '2027-05-01T00:00:00.000Z' })
      .expect(201);
    const id = (response.body as TaskBody).id;
    taskIds.push(id);

    // Recorded in the request's transaction, next to the audit entry.
    const [recorded] = await eventsOf(id, 'TaskCreated');
    expect(recorded).toMatchObject({
      status: 'PENDING',
      actorUserId: staffId,
      payload: {
        relatedType: 'GENERAL',
        relatedId: null,
        dueDate: '2027-05-01',
      },
    });
    await expect(
      prisma.auditLog.count({
        where: {
          entityType: 'Task',
          entityId: id,
          action: 'CREATE',
          userId: staffId,
        },
      }),
    ).resolves.toBe(1);

    await drainDomainEvents(app, [id]);

    const [drained, ...more] = await eventsOf(id, 'TaskCreated');
    expect(more).toHaveLength(0);
    expect(drained.status).toBe('DONE');
    expect(drained.deliveries).toEqual(
      expect.arrayContaining([
        expect.objectContaining({
          handler: 'calendar-sync.task',
          status: 'DONE',
        }),
        expect.objectContaining({
          handler: 'webhooks.forward',
          status: 'DONE',
        }),
      ]),
    );
    expect(drained.deliveries.every((entry) => entry.status === 'DONE')).toBe(
      true,
    );
  });

  it('lists tasks filtered by status', async () => {
    const response = await request(app.getHttpServer())
      .get('/api/v1/tasks?status=OPEN')
      .set('Authorization', `Bearer ${readonlyToken}`)
      .expect(200);
    const tasks = response.body as TaskBody[];
    expect(tasks.some((entry) => entry.id === taskId)).toBe(true);
  });

  it('clears the due date on null and audits the edit', async () => {
    await request(app.getHttpServer())
      .patch(`/api/v1/tasks/${taskId}`)
      .set('Authorization', `Bearer ${staffToken}`)
      .send({ dueDate: '2026-08-01T00:00:00.000Z' })
      .expect(200);

    const response = await request(app.getHttpServer())
      .patch(`/api/v1/tasks/${taskId}`)
      .set('Authorization', `Bearer ${staffToken}`)
      .send({ dueDate: null })
      .expect(200);
    expect((response.body as TaskBody).dueDate).toBeNull();
    const auditEntry = await prisma.auditLog.findFirst({
      where: {
        entityType: 'Task',
        entityId: taskId,
        action: 'UPDATE',
        userId: staffId,
      },
      orderBy: { timestamp: 'desc' },
    });
    expect(auditEntry?.afterData).toEqual(
      expect.objectContaining({ dueDate: null }),
    );
    const updates = await eventsOf(taskId, 'TaskUpdated');
    expect(updates.map((event) => event.payload)).toEqual(
      expect.arrayContaining([
        { status: 'OPEN', dueDate: '2026-08-01' },
        { status: 'OPEN', dueDate: null },
      ]),
    );
    expect(updates).toHaveLength(2);
  });

  it('rejects null for the required title', () => {
    return request(app.getHttpServer())
      .patch(`/api/v1/tasks/${taskId}`)
      .set('Authorization', `Bearer ${staffToken}`)
      .send({ title: null })
      .expect(400);
  });

  it('completes a task and records TaskCompleted once, also when completed again', async () => {
    const response = await request(app.getHttpServer())
      .post(`/api/v1/tasks/${taskId}/complete`)
      .set('Authorization', `Bearer ${staffToken}`)
      .expect(201);
    const task = response.body as TaskBody;
    expect(task.status).toBe('DONE');
    expect(task.completedAt).not.toBeNull();

    const repeated = await request(app.getHttpServer())
      .post(`/api/v1/tasks/${taskId}/complete`)
      .set('Authorization', `Bearer ${staffToken}`)
      .expect(201);
    expect((repeated.body as TaskBody).completedAt).toBe(task.completedAt);

    const completions = await eventsOf(taskId, 'TaskCompleted');
    expect(completions).toHaveLength(1);
    expect(completions[0]).toMatchObject({
      actorUserId: staffId,
      payload: { relatedType: 'GENERAL', relatedId: null },
    });
  });
});