// 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.doris.system;

import org.apache.doris.common.io.Text;
import org.apache.doris.common.io.Writable;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

/*
 * This the superclass of all kinds of heartbeat response
 */
public class HeartbeatResponse implements Writable {
    public enum Type {
        FRONTEND,
        BACKEND,
        BROKER
    }

    public enum HbStatus {
        OK, BAD
    }

    protected Type type;
    protected boolean isTypeRead = false;

    protected HbStatus status;

    // msg and hbTime are no need to be synchronized to other Frontends,
    // and only Master Frontend has these info
    protected String msg;
    protected long hbTime;

    public HeartbeatResponse(Type type) {
        this.type = type;
    }

    public Type getType() {
        return type;
    }

    public HbStatus getStatus() {
        return status;
    }

    public String getMsg() {
        return msg;
    }

    public long getHbTime() {
        return hbTime;
    }

    public void setTypeRead(boolean isTypeRead) {
        this.isTypeRead = isTypeRead;
    }

    public static HeartbeatResponse read(DataInput in) throws IOException {
        HeartbeatResponse result = null;
        Type type = Type.valueOf(Text.readString(in));
        if (type == Type.FRONTEND) {
            result = new FrontendHbResponse();
        } else if (type == Type.BACKEND) {
            result = new BackendHbResponse();
        } else if (type == Type.BROKER) {
            result = new BrokerHbResponse();
        } else {
            throw new IOException("Unknown job type: " + type.name());
        }

        result.setTypeRead(true);
        result.readFields(in);
        return result;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        Text.writeString(out, type.name());
        Text.writeString(out, status.name());
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        if (!isTypeRead) {
            type = Type.valueOf(Text.readString(in));
            isTypeRead = true;
        }

        status = HbStatus.valueOf(Text.readString(in));
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("type: ").append(type.name());
        sb.append(", status: ").append(status.name());
        sb.append(", msg: ").append(msg);
        return sb.toString();
    }
}
