/*
 * 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.admin.indices;

import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.support.ActiveShardCount;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestToXContentListener;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static java.util.Collections.singletonMap;
import static org.elasticsearch.rest.RestRequest.Method.PUT;
import static org.elasticsearch.rest.RestUtils.getAckTimeout;
import static org.elasticsearch.rest.RestUtils.getMasterNodeTimeout;

@ServerlessScope(Scope.PUBLIC)
public class RestCreateIndexAction extends BaseRestHandler {

    @Override
    public List<Route> routes() {
        return List.of(new Route(PUT, "/{index}"));
    }

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

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final var createIndexRequest = prepareRequest(request);
        return channel -> client.admin().indices().create(createIndexRequest, new RestToXContentListener<>(channel));
    }

    static CreateIndexRequest prepareRequest(RestRequest request) {
        CreateIndexRequest createIndexRequest = new CreateIndexRequest(request.param("index"));

        if (request.hasContent()) {
            Map<String, Object> sourceAsMap = XContentHelper.convertToMap(request.requiredContent(), false, request.getXContentType()).v2();
            sourceAsMap = prepareMappings(sourceAsMap);
            createIndexRequest.source(sourceAsMap, LoggingDeprecationHandler.INSTANCE);
        }

        createIndexRequest.ackTimeout(getAckTimeout(request));
        createIndexRequest.masterNodeTimeout(getMasterNodeTimeout(request));
        createIndexRequest.waitForActiveShards(ActiveShardCount.parseString(request.param("wait_for_active_shards")));

        return createIndexRequest;
    }

    static Map<String, Object> prepareMappings(Map<String, Object> source) {
        if (source.containsKey("mappings") == false || (source.get("mappings") instanceof Map) == false) {
            return source;
        }

        Map<String, Object> newSource = new HashMap<>(source);

        @SuppressWarnings("unchecked")
        Map<String, Object> mappings = (Map<String, Object>) source.get("mappings");
        if (MapperService.isMappingSourceTyped(MapperService.SINGLE_MAPPING_NAME, mappings)) {
            throw new IllegalArgumentException(
                "The mapping definition cannot be nested under a type [" + MapperService.SINGLE_MAPPING_NAME + "]."
            );
        }

        newSource.put("mappings", singletonMap(MapperService.SINGLE_MAPPING_NAME, mappings));
        return newSource;
    }

    @Override
    public Set<String> supportedCapabilities() {
        return CreateIndexCapabilities.CAPABILITIES;
    }
}