import 'reflect-metadata';
import { plainToInstance } from 'class-transformer';
import { validate } from 'class-validator';
import { AddPositionDto } from './add-position.dto';
import { UpdatePositionDto } from './update-position.dto';

describe('position DTO validation', () => {
  const validateDto = async <T extends object>(cls: new () => T, payload: Record<string, unknown>) =>
    validate(plainToInstance(cls, payload));

  it('rejects zero quantity when adding a position', async () => {
    const errors = await validateDto(AddPositionDto, { secid: 'SBER', quantity: 0 });

    expect(errors.some((error) => error.property === 'quantity')).toBe(true);
  });

  it('rejects zero quantity when updating a position', async () => {
    const errors = await validateDto(UpdatePositionDto, { quantity: 0 });

    expect(errors.some((error) => error.property === 'quantity')).toBe(true);
  });

  it('rejects invalid buyDate values', async () => {
    const addErrors = await validateDto(AddPositionDto, {
      secid: 'SBER',
      quantity: 1,
      buyDate: 'not-a-date',
    });
    const updateErrors = await validateDto(UpdatePositionDto, { buyDate: 'not-a-date' });

    expect(addErrors.some((error) => error.property === 'buyDate')).toBe(true);
    expect(updateErrors.some((error) => error.property === 'buyDate')).toBe(true);
  });

  it('accepts valid position payloads', async () => {
    await expect(
      validateDto(AddPositionDto, { secid: 'SBER', quantity: 1, buyDate: '2026-06-01' }),
    ).resolves.toHaveLength(0);
    await expect(
      validateDto(UpdatePositionDto, { quantity: 2, buyDate: '2026-06-15' }),
    ).resolves.toHaveLength(0);
  });
});