/*
* Copyright OpenSearch Contributors
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*
*/
package org.opensearch.test.framework.matcher;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;

import org.opensearch.action.bulk.BulkItemResponse;
import org.opensearch.action.bulk.BulkResponse;

import static java.util.Objects.requireNonNull;

class BulkResponseContainExceptionsMatcher extends TypeSafeDiagnosingMatcher<BulkResponse> {

    private final Matcher<Throwable> exceptionMatcher;

    public BulkResponseContainExceptionsMatcher(Matcher<Throwable> exceptionMatcher) {
        this.exceptionMatcher = requireNonNull(exceptionMatcher, "Exception matcher is required.");
    }

    @Override
    protected boolean matchesSafely(BulkResponse response, Description mismatchDescription) {
        if (response.hasFailures() == false) {
            mismatchDescription.appendText("received successful bulk response what is not expected.");
            return false;
        }
        BulkItemResponse[] items = response.getItems();
        if ((items == null) || (items.length == 0)) {
            mismatchDescription.appendText("bulk response does not contain items ").appendValue(items);
            return false;
        }
        for (int i = 0; i < items.length; ++i) {
            BulkItemResponse item = items[i];
            if (item == null) {
                mismatchDescription.appendText("bulk item response with index ").appendValue(i).appendText(" is null.");
                return false;
            }
            BulkItemResponse.Failure failure = item.getFailure();
            if (failure == null) {
                mismatchDescription.appendText("bulk response item with index ").appendValue(i).appendText(" does not contain failure");
                return false;
            }
            Exception exception = failure.getCause();
            if (exception == null) {
                mismatchDescription.appendText("bulk response item with index ").appendValue(i).appendText(" does not contain exception.");
                return false;
            }
            if (exceptionMatcher.matches(exception) == false) {
                mismatchDescription.appendText("bulk response item with index ")
                    .appendValue(i)
                    .appendText(" contains incorrect exception which is ")
                    .appendValue(exception);
                return false;
            }
        }
        return true;
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("bulk response should contain exceptions which indicate failure");
    }
}