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/*
 * 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.admin.indices;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.Version;
import org.elasticsearch.action.admin.indices.shrink.ResizeRequest;
import org.elasticsearch.action.admin.indices.shrink.ResizeType;
import org.elasticsearch.action.support.ActiveShardCount;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.logging.DeprecationCategory;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.core.Booleans;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestToXContentListener;

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

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

public abstract class RestResizeHandler extends BaseRestHandler {
    private static final Logger logger = LogManager.getLogger(RestResizeHandler.class);
    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(logger.getName());

    RestResizeHandler() {}

    @Override
    public abstract String getName();

    abstract ResizeType getResizeType();

    @Override
    public final RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final ResizeRequest resizeRequest = new ResizeRequest(request.param("target"), request.param("index"));
        resizeRequest.setResizeType(getResizeType());
        // copy_settings should be removed in Elasticsearch 8.0.0; cf. https://github.com/elastic/elasticsearch/issues/28347
        assert Version.CURRENT.major < 8;
        final String rawCopySettings = request.param("copy_settings");
        final Boolean copySettings;
        if (rawCopySettings == null) {
            copySettings = resizeRequest.getCopySettings();
        } else {
            if (rawCopySettings.isEmpty()) {
                copySettings = true;
            } else {
                copySettings = Booleans.parseBoolean(rawCopySettings);
                if (copySettings == false) {
                    throw new IllegalArgumentException("parameter [copy_settings] can not be explicitly set to [false]");
                }
            }
            deprecationLogger.critical(
                DeprecationCategory.API,
                "resize_deprecated_parameter",
                "parameter [copy_settings] is deprecated and will be removed in 8.0.0"
            );
        }
        resizeRequest.setCopySettings(copySettings);
        request.applyContentParser(resizeRequest::fromXContent);
        resizeRequest.timeout(request.paramAsTime("timeout", resizeRequest.timeout()));
        resizeRequest.masterNodeTimeout(request.paramAsTime("master_timeout", resizeRequest.masterNodeTimeout()));
        resizeRequest.setWaitForActiveShards(ActiveShardCount.parseString(request.param("wait_for_active_shards")));
        return channel -> client.admin().indices().resizeIndex(resizeRequest, new RestToXContentListener<>(channel));
    }

    public static class RestShrinkIndexAction extends RestResizeHandler {

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

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

        @Override
        protected ResizeType getResizeType() {
            return ResizeType.SHRINK;
        }

    }

    public static class RestSplitIndexAction extends RestResizeHandler {

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

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

        @Override
        protected ResizeType getResizeType() {
            return ResizeType.SPLIT;
        }

    }

    public static class RestCloneIndexAction extends RestResizeHandler {

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

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

        @Override
        protected ResizeType getResizeType() {
            return ResizeType.CLONE;
        }

    }

}