/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.blob.v2;

import io.crate.Constants;
import io.crate.action.FutureActionListener;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.create.TransportCreateIndexAction;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexResponse;
import org.elasticsearch.action.admin.indices.delete.TransportDeleteIndexAction;
import org.elasticsearch.action.admin.indices.settings.put.TransportUpdateSettingsAction;
import org.elasticsearch.action.admin.indices.settings.put.UpdateSettingsRequest;
import org.elasticsearch.action.admin.indices.settings.put.UpdateSettingsResponse;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.Singleton;
import org.elasticsearch.common.settings.Settings;

import java.util.concurrent.CompletableFuture;

import static io.crate.blob.v2.BlobIndex.fullIndexName;
import static io.crate.blob.v2.BlobIndicesService.SETTING_INDEX_BLOBS_ENABLED;
import static io.crate.metadata.IndexMappings.DEFAULT_TABLE_MAPPING;

/**
 * DDL Client for blob tables - used to create, update or delete blob tables.
 */
@Singleton
public class BlobAdminClient {

    private final TransportUpdateSettingsAction updateSettingsAction;
    private final TransportCreateIndexAction createIndexAction;
    private final TransportDeleteIndexAction deleteIndexAction;

    @Inject
    public BlobAdminClient(TransportUpdateSettingsAction updateSettingsAction,
                           TransportCreateIndexAction createIndexAction,
                           TransportDeleteIndexAction deleteIndexAction) {
        this.updateSettingsAction = updateSettingsAction;
        this.createIndexAction = createIndexAction;
        this.deleteIndexAction = deleteIndexAction;
    }

    /**
     * can be used to alter the number of replicas.
     *
     * @param tableName     name of the blob table
     * @param indexSettings updated index settings
     */
    public CompletableFuture<Long> alterBlobTable(String tableName, Settings indexSettings) {
        FutureActionListener<UpdateSettingsResponse, Long> listener = new FutureActionListener<>(r -> 1L);
        updateSettingsAction.execute(new UpdateSettingsRequest(indexSettings, fullIndexName(tableName)), listener);
        return listener;
    }

    public CompletableFuture<Long> createBlobTable(String tableName, Settings indexSettings) {
        Settings.Builder builder = Settings.builder();
        builder.put(indexSettings);
        builder.put(SETTING_INDEX_BLOBS_ENABLED.getKey(), true);

        FutureActionListener<CreateIndexResponse, Long> listener = new FutureActionListener<>(r -> 1L);
        CreateIndexRequest createIndexRequest = new CreateIndexRequest(fullIndexName(tableName), builder.build())
            .mapping(Constants.DEFAULT_MAPPING_TYPE, DEFAULT_TABLE_MAPPING);
        createIndexAction.execute(createIndexRequest, listener);
        return listener;
    }

    public CompletableFuture<Long> dropBlobTable(final String tableName) {
        FutureActionListener<DeleteIndexResponse, Long> listener = new FutureActionListener<>(r -> 1L);
        deleteIndexAction.execute(new DeleteIndexRequest(fullIndexName(tableName)), listener);
        return listener;
    }
}