/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */
package org.apache.distributedlog.service;

import java.util.concurrent.CompletionException;
import org.apache.distributedlog.exceptions.DLException;
import org.apache.distributedlog.exceptions.OwnershipAcquireFailedException;
import org.apache.distributedlog.thrift.service.BulkWriteResponse;
import org.apache.distributedlog.thrift.service.ResponseHeader;
import org.apache.distributedlog.thrift.service.StatusCode;
import org.apache.distributedlog.thrift.service.WriteResponse;

/**
 * Utility methods for building write proxy service responses.
 */
public class ResponseUtils {
    public static ResponseHeader deniedHeader() {
        return new ResponseHeader(StatusCode.REQUEST_DENIED);
    }

    public static ResponseHeader streamUnavailableHeader() {
        return new ResponseHeader(StatusCode.STREAM_UNAVAILABLE);
    }

    public static ResponseHeader successHeader() {
        return new ResponseHeader(StatusCode.SUCCESS);
    }

    public static ResponseHeader ownerToHeader(String owner) {
        return new ResponseHeader(StatusCode.FOUND).setLocation(owner);
    }

    public static ResponseHeader exceptionToHeader(Throwable t) {
        ResponseHeader response = new ResponseHeader();
        if (t instanceof DLException) {
            DLException dle = (DLException) t;
            if (dle instanceof OwnershipAcquireFailedException) {
                response.setLocation(((OwnershipAcquireFailedException) dle).getCurrentOwner());
            }
            response.setCode(StatusCode.findByValue(dle.getCode()));
            response.setErrMsg(dle.getMessage());
        } else if (t instanceof CompletionException) {
            return exceptionToHeader(t.getCause());
        } else {
            response.setCode(StatusCode.INTERNAL_SERVER_ERROR);
            response.setErrMsg("Internal server error : " + t.getMessage());
        }
        return response;
    }

    public static WriteResponse write(ResponseHeader responseHeader) {
        return new WriteResponse(responseHeader);
    }

    public static WriteResponse writeSuccess() {
        return new WriteResponse(successHeader());
    }

    public static WriteResponse writeDenied() {
        return new WriteResponse(deniedHeader());
    }

    public static BulkWriteResponse bulkWrite(ResponseHeader responseHeader) {
        return new BulkWriteResponse(responseHeader);
    }

    public static BulkWriteResponse bulkWriteSuccess() {
        return new BulkWriteResponse(successHeader());
    }

    public static BulkWriteResponse bulkWriteDenied() {
        return new BulkWriteResponse(deniedHeader());
    }
}