import 'reflect-metadata';
import { BadRequestException, ForbiddenException, ValidationPipe } from '@nestjs/common';
import { describe, expect, it, vi } from 'vitest';
import { ROLES_KEY } from '../auth/decorators/roles.decorator';
import { CreateReminderDto, SnoozeReminderDto, UpdateReminderDto } from './dto/reminder.dto';
import { RemindersController } from './reminders.controller';

function makeService() {
  return {
    list: vi.fn(async (..._args: unknown[]) => []),
    getEmailAvailability: vi.fn(async (..._args: unknown[]) => ({
      smtpConfigured: true,
      hasEmail: true,
    })),
    create: vi.fn(async (..._args: unknown[]) => ({})),
    update: vi.fn(async (..._args: unknown[]) => ({})),
    snooze: vi.fn(async (..._args: unknown[]) => ({})),
    remove: vi.fn(async (..._args: unknown[]) => ({ deleted: true })),
  };
}

const req = (tenantId?: string) => ({ tenantId }) as any;
const user = { id: 'u1', username: 'u', role: 'USER', tenantId: 't1' } as any;
const proto = RemindersController.prototype as any;

describe('RemindersController — Rollen', () => {
  it.each([
    'list',
    'emailStatus',
    'create',
    'update',
    'snooze',
    'remove',
  ])('%s traegt keine Routen-Rolle (jeder Angemeldete)', (name) => {
    expect(Reflect.getMetadata(ROLES_KEY, proto[name])).toBeUndefined();
  });

  it('haengt an Pfad reminders', () => {
    expect(Reflect.getMetadata('path', RemindersController)).toBe('reminders');
  });
});

describe('RemindersController — Mandant', () => {
  it('reicht req.tenantId und die Benutzerkennung an den Dienst weiter', async () => {
    const service = makeService();
    const controller = new RemindersController(service as any);
    await controller.list(req('t1'), user);
    await controller.emailStatus(req('t1'), user);
    expect(service.getEmailAvailability).toHaveBeenCalledWith('t1', 'u1');
    await controller.create(req('t1'), user, { title: 'a', dueAt: '2099-01-01T10:00:00.000Z' });
    expect(service.list).toHaveBeenCalledWith('t1', 'u1');
    expect(service.create.mock.calls[0].slice(0, 2)).toEqual(['t1', 'u1']);
    await controller.update(req('t1'), user, 'x', { title: 'b' });
    await controller.snooze(req('t1'), user, 'x', { dueAt: '2099-01-01T10:00:00.000Z' });
    await controller.remove(req('t1'), user, 'x');
    expect(service.update.mock.calls[0].slice(0, 3)).toEqual(['t1', 'u1', 'x']);
    expect(service.snooze.mock.calls[0].slice(0, 3)).toEqual(['t1', 'u1', 'x']);
    expect(service.remove).toHaveBeenCalledWith('t1', 'u1', 'x');
  });

  it('wirft ForbiddenException ohne req.tenantId', async () => {
    const controller = new RemindersController(makeService() as any);
    await expect(controller.list(req(), user)).rejects.toBeInstanceOf(ForbiddenException);
    await expect(controller.emailStatus(req(), user)).rejects.toBeInstanceOf(ForbiddenException);
    await expect(controller.update(req(), user, 'x', {})).rejects.toBeInstanceOf(
      ForbiddenException,
    );
    await expect(
      controller.snooze(req(), user, 'x', { dueAt: '2099-01-01T10:00:00.000Z' }),
    ).rejects.toBeInstanceOf(ForbiddenException);
    await expect(controller.remove(req(), user, 'x')).rejects.toBeInstanceOf(ForbiddenException);
    await expect(
      controller.create(req(), user, { title: 'a', dueAt: '2099-01-01T10:00:00.000Z' }),
    ).rejects.toBeInstanceOf(ForbiddenException);
  });

  it('die globale Pipe verwirft untergeschobene Felder (T-IF2-02)', async () => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    const out: any = await pipe.transform(
      {
        title: '  a  ',
        dueAt: '2099-01-01T10:00:00.000Z',
        tenantId: 'evil',
        userId: 'evil',
        emailSentAt: '2020-01-01T00:00:00.000Z',
        emailAttempts: 9,
      },
      { type: 'body', metatype: CreateReminderDto },
    );
    expect(out).not.toHaveProperty('tenantId');
    expect(out).not.toHaveProperty('userId');
    expect(out).not.toHaveProperty('emailSentAt');
    expect(out).not.toHaveProperty('emailAttempts');
    expect(out.title).toBe('a');
  });
});

describe('RemindersController — Pipe fuer Aendern und Verschieben', () => {
  it('Aendern verwirft untergeschobene Felder, ein Teil-Update ist erlaubt', async () => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    const out: any = await pipe.transform(
      { title: 'b', tenantId: 'evil', userId: 'evil', emailAttempts: 0 },
      { type: 'body', metatype: UpdateReminderDto },
    );
    expect(out).toEqual({ title: 'b' });
  });

  it.each([
    'title',
    'description',
    'dueAt',
    'emailEnabled',
  ])('Aendern mit %s: null ergibt 400 statt eines Datenbankfehlers', async (field) => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    await expect(
      pipe.transform({ [field]: null }, { type: 'body', metatype: UpdateReminderDto }),
    ).rejects.toBeInstanceOf(BadRequestException);
  });

  it('Aendern: ein leerer Titel wird abgelehnt, ein leeres Objekt ist erlaubt', async () => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    await expect(
      pipe.transform({ title: '   ' }, { type: 'body', metatype: UpdateReminderDto }),
    ).rejects.toBeInstanceOf(BadRequestException);
    await expect(
      pipe.transform({}, { type: 'body', metatype: UpdateReminderDto }),
    ).resolves.toEqual({});
  });

  it('Verschieben verlangt einen ISO-Zeitpunkt und verwirft Fremdfelder', async () => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    const out: any = await pipe.transform(
      { dueAt: '2099-01-01T10:00:00.000Z', userId: 'evil' },
      { type: 'body', metatype: SnoozeReminderDto },
    );
    expect(out).toEqual({ dueAt: '2099-01-01T10:00:00.000Z' });
    await expect(
      pipe.transform({ dueAt: 'morgen' }, { type: 'body', metatype: SnoozeReminderDto }),
    ).rejects.toBeTruthy();
  });
});

describe('RemindersController — emailEnabled', () => {
  it('die Pipe laesst emailEnabled beim Anlegen und Aendern durch und verlangt einen Wahrheitswert', async () => {
    const pipe = new ValidationPipe({ whitelist: true, transform: true });
    const created: any = await pipe.transform(
      { title: 'a', dueAt: '2099-01-01T10:00:00.000Z', emailEnabled: true },
      { type: 'body', metatype: CreateReminderDto },
    );
    expect(created.emailEnabled).toBe(true);
    const updated: any = await pipe.transform(
      { emailEnabled: false },
      { type: 'body', metatype: UpdateReminderDto },
    );
    expect(updated.emailEnabled).toBe(false);
    await expect(
      pipe.transform(
        { title: 'a', dueAt: '2099-01-01T10:00:00.000Z', emailEnabled: 'ja' },
        { type: 'body', metatype: CreateReminderDto },
      ),
    ).rejects.toBeTruthy();
  });
});

describe('RemindersController — Routen-Reihenfolge (statisch vor :id)', () => {
  it('deklariert list vor jeder :id-Route', () => {
    const methods = Object.getOwnPropertyNames(RemindersController.prototype);
    const listIdx = methods.indexOf('list');
    expect(listIdx).toBeGreaterThanOrEqual(0);
    for (const name of methods) {
      const path = Reflect.getMetadata('path', proto[name]);
      if (typeof path === 'string' && path.startsWith(':id')) {
        expect(listIdx).toBeLessThan(methods.indexOf(name));
        // auch die statische Route email-status steht vor jeder :id-Route
        expect(methods.indexOf('emailStatus')).toBeLessThan(methods.indexOf(name));
      }
    }
    expect(methods.indexOf('emailStatus')).toBeGreaterThanOrEqual(0);
    expect(Reflect.getMetadata('path', proto.emailStatus)).toBe('email-status');
  });
});