/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.rest.action;

import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.rest.FakeRestChannel;
import org.elasticsearch.test.rest.FakeRestRequest;
import org.elasticsearch.transport.TransportResponse;
import org.elasticsearch.transport.TransportResponse.Empty;
import org.elasticsearch.xcontent.XContentBuilder;

import java.util.concurrent.atomic.AtomicReference;

public class RestBuilderListenerTests extends ESTestCase {

    public void testXContentBuilderClosedInBuildResponse() throws Exception {
        AtomicReference<XContentBuilder> builderAtomicReference = new AtomicReference<>();
        RestBuilderListener<TransportResponse.Empty> builderListener = new RestBuilderListener<Empty>(
            new FakeRestChannel(new FakeRestRequest(), randomBoolean(), 1)
        ) {
            @Override
            public RestResponse buildResponse(Empty empty, XContentBuilder builder) throws Exception {
                builderAtomicReference.set(builder);
                builder.close();
                return new RestResponse(RestStatus.OK, RestResponse.TEXT_CONTENT_TYPE, BytesArray.EMPTY);
            }
        };

        builderListener.buildResponse(Empty.INSTANCE);
        assertNotNull(builderAtomicReference.get());
        assertTrue(builderAtomicReference.get().generator().isClosed());
    }

    public void testXContentBuilderNotClosedInBuildResponseAssertionsDisabled() throws Exception {
        AtomicReference<XContentBuilder> builderAtomicReference = new AtomicReference<>();
        RestBuilderListener<TransportResponse.Empty> builderListener = new RestBuilderListener<Empty>(
            new FakeRestChannel(new FakeRestRequest(), randomBoolean(), 1)
        ) {
            @Override
            public RestResponse buildResponse(Empty empty, XContentBuilder builder) throws Exception {
                builderAtomicReference.set(builder);
                return new RestResponse(RestStatus.OK, RestResponse.TEXT_CONTENT_TYPE, BytesArray.EMPTY);
            }

            @Override
            boolean assertBuilderClosed(XContentBuilder xContentBuilder) {
                // don't check the actual builder being closed so we can test auto close
                return true;
            }
        };

        builderListener.buildResponse(Empty.INSTANCE);
        assertNotNull(builderAtomicReference.get());
        assertTrue(builderAtomicReference.get().generator().isClosed());
    }

    public void testXContentBuilderNotClosedInBuildResponseAssertionsEnabled() throws Exception {
        assumeTrue("tests are not being run with assertions", RestBuilderListener.class.desiredAssertionStatus());

        RestBuilderListener<TransportResponse.Empty> builderListener = new RestBuilderListener<Empty>(
            new FakeRestChannel(new FakeRestRequest(), randomBoolean(), 1)
        ) {
            @Override
            public RestResponse buildResponse(Empty empty, XContentBuilder builder) throws Exception {
                return new RestResponse(RestStatus.OK, RestResponse.TEXT_CONTENT_TYPE, BytesArray.EMPTY);
            }
        };

        AssertionError error = expectThrows(AssertionError.class, () -> builderListener.buildResponse(Empty.INSTANCE));
        assertEquals("callers should ensure the XContentBuilder is closed themselves", error.getMessage());
    }
}
