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package io.mstream.trader.commons.ratpack.exception;

import io.mstream.trader.commons.http.RequestContext;
import io.mstream.trader.commons.validation.ValidationError;
import io.mstream.trader.commons.validation.ValidationResult;
import io.mstream.trader.commons.validation.request.RequestValidator;
import io.netty.handler.codec.http.HttpResponseStatus;
import org.slf4j.Logger;
import ratpack.http.Request;

import java.util.Set;
import java.util.function.Predicate;

import static org.slf4j.LoggerFactory.getLogger;
import static ratpack.jackson.Jackson.json;

public abstract class ValidationErrorHandler implements Predicate {

    private static final Logger LOGGER = getLogger(ValidationErrorHandler.class);

    private final RequestValidator requestValidator;

    protected ValidationErrorHandler(RequestValidator requestValidator) {
        this.requestValidator = requestValidator;
    }

    @Override
    public boolean test(RequestContext requestContext) {

        ValidationResult validationResult = requestValidator.validate(requestContext);

        if (!validationResult.isValid()) {
            Request request = requestContext.getContext().getRequest();
            Set validationErrors =
                    validationResult.getValidationErrors();
            LOGGER.debug(
                    "request {} {} rejected because of validation errors: {}",
                    request.getMethod(),
                    request.getPath(),
                    validationErrors);

            requestContext.getContext().getResponse()
                    .status(HttpResponseStatus.BAD_REQUEST.code());
            requestContext.getContext().render(json(validationErrors));
            return false;
        }
        return true;
    }
}