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/**
 * Copyright 2017 Zaradai
 * 
 * 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 com.zaradai.gluon.model;

import com.google.common.base.MoreObjects;

import java.io.Serializable;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.zaradai.gluon.util.Validations.checkString;

public class ServiceReply implements Serializable{
    public static final String INVALID_REQUEST_ID = "Request ID cannot be null or empty.";
    public static final String INVALID_ERROR = "Error cannot be null.";

    private static final long serialVersionUID = 2725796069265989562L;

    public static ServiceReply good(String requestId, Object result) {
        return new ServiceReply(checkString(requestId, INVALID_REQUEST_ID), result);
    }

    public static ServiceReply bad(String requestId, Throwable error) {
        return new ServiceReply(checkString(requestId, INVALID_REQUEST_ID), checkNotNull(error, INVALID_ERROR));
    }

    private String requestId;
    private Throwable error;
    private Object reply;

    private ServiceReply(String requestId, Object reply) {
        this.requestId = requestId;
        this.reply = reply;
    }

    private ServiceReply(String requestId, Throwable error) {
        this.requestId = requestId;
        this.error = error;
    }

    public boolean isGood() {
        return error == null;
    }

    public String getRequestId() {
        return requestId;
    }

    public Throwable getError() {
        return error;
    }

    public Object getReply() {
        return reply;
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                .add("requestId", requestId)
                .add("error", error)
                .add("reply", reply)
                .toString();
    }
}