package eu.ztsh.wymiana.validation;

import eu.ztsh.wymiana.web.model.CurrencyExchangeRequest;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

public class ValidExchangeRequestValidator implements
    ConstraintValidator<ValidExchangeRequest, CurrencyExchangeRequest> {

    @Override
    public boolean isValid(CurrencyExchangeRequest request,
                           ConstraintValidatorContext constraintValidatorContext) {
        if (request == null) {
            return false;
        }

        // Apart from @NotNull annotation we need to check if request.from() != null to avoid NPE in equals
        return (request.from() != null && !request.from().equals(request.to()))
            && !((request.toBuy() == null && request.toSell() == null)
                || (request.toBuy() != null && request.toSell() != null))
            && ((request.toBuy() != null && request.toBuy() >= 0)
                || (request.toSell() != null && request.toSell() >= 0));
    }

}