@Service
public class ProductServiceImpl implements ProductService {

    private final ProductRepository productRepository;
    private final CategoryRepository categoryRepository;
    private final UserRepository userRepository;
    private final ValidatorUtil validatorUtil;
    private final ModelMapper modelMapper;

    @Autowired
    public ProductServiceImpl(ProductRepository productRepository, CategoryRepository categoryRepository, UserRepository userRepository, ValidatorUtil validatorUtil, ModelMapper modelMapper) {
        this.productRepository = productRepository;
        this.categoryRepository = categoryRepository;
        this.userRepository = userRepository;
        this.validatorUtil = validatorUtil;
        this.modelMapper = modelMapper;
    }


    @Override
    public void seedProducts(ProductSeedDto[] productSeedDtos) {
        for (ProductSeedDto productSeedDto : productSeedDtos) {
            if (!this.validatorUtil.isValid(productSeedDto)) {
                this.validatorUtil.violations(productSeedDto)
                        .forEach(violation -> System.out.println(violation.getMessage()));
                continue;
            }
            Product entity = this.modelMapper.map(productSeedDto, Product.class);
            entity.setSeller(this.getRandomUser());

            Random random = new Random();

            if (random.nextInt() % 13 != 0) {
                entity.setBuyer(this.getRandomUser());
            }
            entity.setCategories(this.getRandomCategories());
            this.productRepository.saveAndFlush(entity);
        }
    }

    @Override
    public List<ProductInRangeDto> productInRange(BigDecimal more, BigDecimal less) {
        List<Product> productEntities = this.productRepository.findAllByPriceBetweenAndBuyerOrderByPrice(more, less, null);
        List<ProductInRangeDto> productInRangeDtos = new ArrayList<>();
        for (Product productEntity : productEntities) {
            ProductInRangeDto productInRangeDto = this.modelMapper.map(productEntity, ProductInRangeDto.class);
            productInRangeDto.setSeller(String.format("%s %s", productEntity.getSeller().getFirstName(), productEntity.getSeller().getLastName()));

            productInRangeDtos.add(productInRangeDto);
        }
        return productInRangeDtos;
    }


    private User getRandomUser() {
        Random random = new Random();
        return this.userRepository.getOne(random.nextInt((int) this.userRepository.count() - 1) + 1);
    }

    private List<Category> getRandomCategories() {
        Random random = new Random();
        List<Category> categories = new ArrayList<>();
        int categoriesCount = random.nextInt((int) this.categoryRepository.count() - 1) + 1;
        for (int i = 0; i < categoriesCount; i++) {
            categories.add(this.categoryRepository.getOne(random.nextInt((int) this.categoryRepository.count() - 1) + 1));
        }
        return categories;
    }

}