/*
 * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.rest.action.document;

import org.elasticsearch.action.ActionRequestValidationException;
import org.elasticsearch.action.DocWriteRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.support.ActiveShardCount;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.index.VersionType;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestUtils;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestActions;
import org.elasticsearch.rest.action.RestToXContentListener;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;

import java.io.IOException;
import java.util.List;

import static org.elasticsearch.rest.RestRequest.Method.POST;

@ServerlessScope(Scope.PUBLIC)
public class RestUpdateAction extends BaseRestHandler {
    @Override
    public List<Route> routes() {
        return List.of(new Route(POST, "/{index}/_update/{id}"));
    }

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

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        UpdateRequest updateRequest = new UpdateRequest(request.param("index"), request.param("id"));
        updateRequest.routing(request.param("routing"));
        updateRequest.timeout(request.paramAsTime("timeout", updateRequest.timeout()));
        updateRequest.setRefreshPolicy(request.param("refresh"));
        String waitForActiveShards = request.param("wait_for_active_shards");
        if (waitForActiveShards != null) {
            updateRequest.waitForActiveShards(ActiveShardCount.parseString(waitForActiveShards));
        }
        updateRequest.docAsUpsert(request.paramAsBoolean("doc_as_upsert", updateRequest.docAsUpsert()));
        FetchSourceContext fetchSourceContext = FetchSourceContext.parseFromRestRequest(request);
        if (fetchSourceContext != null) {
            updateRequest.fetchSource(fetchSourceContext);
        }

        updateRequest.retryOnConflict(request.paramAsInt("retry_on_conflict", updateRequest.retryOnConflict()));
        if (request.hasParam("version") || request.hasParam("version_type")) {
            final ActionRequestValidationException versioningError = new ActionRequestValidationException();
            versioningError.addValidationError(
                "internal versioning can not be used for optimistic concurrency control. "
                    + "Please use `if_seq_no` and `if_primary_term` instead"
            );
            throw versioningError;
        }

        updateRequest.setIfSeqNo(request.paramAsLong("if_seq_no", updateRequest.ifSeqNo()));
        updateRequest.setIfPrimaryTerm(request.paramAsLong("if_primary_term", updateRequest.ifPrimaryTerm()));
        updateRequest.setRequireAlias(request.paramAsBoolean(DocWriteRequest.REQUIRE_ALIAS, updateRequest.isRequireAlias()));

        request.applyContentParser(RestUtils.getIncludeSourceOnError(request), parser -> {
            updateRequest.fromXContent(parser);
            IndexRequest upsertRequest = updateRequest.upsertRequest();
            if (upsertRequest != null) {
                upsertRequest.routing(request.param("routing"));
                upsertRequest.version(RestActions.parseVersion(request));
                upsertRequest.versionType(VersionType.fromString(request.param("version_type"), upsertRequest.versionType()));
            }
            IndexRequest doc = updateRequest.doc();
            if (doc != null) {
                doc.routing(request.param("routing"));
                doc.version(RestActions.parseVersion(request));
                doc.versionType(VersionType.fromString(request.param("version_type"), doc.versionType()));
            }
        });

        return channel -> client.update(
            updateRequest,
            new RestToXContentListener<>(channel, UpdateResponse::status, r -> r.getLocation(updateRequest.routing()))
        );
    }

}