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/*
 * Licensed 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.
 */

package org.apache.bookkeeper.clients.utils;

import static com.google.common.util.concurrent.MoreExecutors.directExecutor;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import io.grpc.Status;
import io.grpc.StatusException;
import io.grpc.StatusRuntimeException;
import java.util.concurrent.CompletableFuture;

/**
 * RPC related utils.
 */
public class RpcUtils {

    /**
     * Function to create request.
     */
    @FunctionalInterface
    public interface CreateRequestFunc {
        ReqT apply();
    }

    /**
     * Function to process request.
     */
    @FunctionalInterface
    public interface ProcessRequestFunc {
        ListenableFuture process(ServiceT service, ReqT req);
    }

    /**
     * Function to process response.
     */
    @FunctionalInterface
    public interface ProcessResponseFunc {
        void process(RespT resp, CompletableFuture resultFuture);
    }

    public static boolean isContainerNotFound(Throwable cause) {
        if (cause instanceof StatusRuntimeException) {
            return Status.NOT_FOUND ==  ((StatusRuntimeException) cause).getStatus();
        } else if (cause instanceof StatusException) {
            return Status.NOT_FOUND ==  ((StatusException) cause).getStatus();
        } else {
            return false;
        }
    }

    public static  void processRpc(
        ServiceT service,
        CompletableFuture result,
        CreateRequestFunc createRequestFunc,
        ProcessRequestFunc processRequestFunc,
        ProcessResponseFunc processResponseFunc) {
        ReqT request = createRequestFunc.apply();
        ListenableFuture resultFuture =
            processRequestFunc.process(service, request);
        Futures.addCallback(
            resultFuture,
            new FutureCallback() {
                @Override
                public void onSuccess(RespT resp) {
                    processResponseFunc.process(resp, result);
                }

                @Override
                public void onFailure(Throwable throwable) {
                    GrpcUtils.processRpcException(throwable, result);
                }
            }
        , directExecutor());
    }

}