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/*
 * 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.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.rest.action.document;

import org.opensearch.LegacyESVersion;
import org.opensearch.action.DocWriteRequest;
import org.opensearch.action.index.IndexRequest;
import org.opensearch.action.support.ActiveShardCount;
import org.opensearch.client.node.NodeClient;
import org.opensearch.cluster.node.DiscoveryNodes;
import org.opensearch.index.VersionType;
import org.opensearch.rest.BaseRestHandler;
import org.opensearch.rest.RestRequest;
import org.opensearch.rest.action.RestActions;
import org.opensearch.rest.action.RestStatusToXContentListener;

import java.io.IOException;
import java.util.List;
import java.util.Locale;
import java.util.function.Supplier;

import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.opensearch.rest.RestRequest.Method.POST;
import static org.opensearch.rest.RestRequest.Method.PUT;

/**
 * Transport action to index a document
 *
 * @opensearch.api
 */
public class RestIndexAction extends BaseRestHandler {

    @Override
    public List routes() {
        return unmodifiableList(asList(new Route(POST, "/{index}/_doc/{id}"), new Route(PUT, "/{index}/_doc/{id}")));
    }

    @Override
    public String getName() {
        return "document_index_action";
    }

    /**
     * Create handler action.
     *
     * @opensearch.internal
     */
    public static final class CreateHandler extends RestIndexAction {

        @Override
        public String getName() {
            return "document_create_action";
        }

        @Override
        public List routes() {
            return unmodifiableList(asList(new Route(POST, "/{index}/_create/{id}"), new Route(PUT, "/{index}/_create/{id}")));
        }

        @Override
        public RestChannelConsumer prepareRequest(RestRequest request, final NodeClient client) throws IOException {
            validateOpType(request.params().get("op_type"));
            request.params().put("op_type", "create");
            return super.prepareRequest(request, client);
        }

        void validateOpType(String opType) {
            if (null != opType && false == "create".equals(opType.toLowerCase(Locale.ROOT))) {
                throw new IllegalArgumentException("opType must be 'create', found: [" + opType + "]");
            }
        }
    }

    /**
     * The auto id handler.
     *
     * @opensearch.internal
     */
    public static final class AutoIdHandler extends RestIndexAction {

        private final Supplier nodesInCluster;

        public AutoIdHandler(Supplier nodesInCluster) {
            this.nodesInCluster = nodesInCluster;
        }

        @Override
        public String getName() {
            return "document_create_action_auto_id";
        }

        @Override
        public List routes() {
            return unmodifiableList(asList(new Route(POST, "/{index}/_doc")));
        }

        @Override
        public RestChannelConsumer prepareRequest(RestRequest request, final NodeClient client) throws IOException {
            assert request.params().get("id") == null : "non-null id: " + request.params().get("id");
            if (request.params().get("op_type") == null && nodesInCluster.get().getMinNodeVersion().onOrAfter(LegacyESVersion.V_7_5_0)) {
                // default to op_type create
                request.params().put("op_type", "create");
            }
            return super.prepareRequest(request, client);
        }
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        IndexRequest indexRequest = new IndexRequest(request.param("index"));
        indexRequest.id(request.param("id"));
        indexRequest.routing(request.param("routing"));
        indexRequest.setPipeline(request.param("pipeline"));
        indexRequest.source(request.requiredContent(), request.getMediaType());
        indexRequest.timeout(request.paramAsTime("timeout", IndexRequest.DEFAULT_TIMEOUT));
        indexRequest.setRefreshPolicy(request.param("refresh"));
        indexRequest.version(RestActions.parseVersion(request));
        indexRequest.versionType(VersionType.fromString(request.param("version_type"), indexRequest.versionType()));
        indexRequest.setIfSeqNo(request.paramAsLong("if_seq_no", indexRequest.ifSeqNo()));
        indexRequest.setIfPrimaryTerm(request.paramAsLong("if_primary_term", indexRequest.ifPrimaryTerm()));
        indexRequest.setRequireAlias(request.paramAsBoolean(DocWriteRequest.REQUIRE_ALIAS, indexRequest.isRequireAlias()));
        String sOpType = request.param("op_type");
        String waitForActiveShards = request.param("wait_for_active_shards");
        if (waitForActiveShards != null) {
            indexRequest.waitForActiveShards(ActiveShardCount.parseString(waitForActiveShards));
        }
        if (sOpType != null) {
            indexRequest.opType(sOpType);
        }

        return channel -> client.index(
            indexRequest,
            new RestStatusToXContentListener<>(channel, r -> r.getLocation(indexRequest.routing()))
        );
    }

}