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// Copyright 2021-present StarRocks, Inc. All rights reserved.
//
// 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
//
//     https://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.staros.worker;

import com.staros.util.LogUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Worker Group manages a certain number of worker in one service.
 */
public class WorkerGroup {
    private static final Logger LOG = LogManager.getLogger(WorkerGroup.class);

    private final String serviceId;
    private final long groupId;
    private List workers;

    public WorkerGroup(String serviceId, long groupId) {
        // TODO: load from storage

        this.serviceId = serviceId;
        this.groupId = groupId;
        this.workers = new ArrayList();
    }

    public String getServiceId() {
        return serviceId;
    }

    public long getGroupId() {
        return groupId;
    }

    public void addWorker(Worker worker) {
        checkWorker(worker);

        for (Worker w : workers) {
            if (w.equals(worker)) {
                LogUtils.fatal(LOG, "worker {}({}) already exist in worker group.", worker.getWorkerId(), worker.getIpPort());
            }
        }

        workers.add(worker);
    }

    public void removeWorker(Worker worker) {
        checkWorker(worker);

        for (Worker w : workers) {
            if (w.equals(worker)) {
                workers.remove(worker);
                return;
            }
        }

        LogUtils.fatal(LOG, "worker {}({}) not exist in worker group when remove.", worker.getWorkerId(), worker.getIpPort());
    }

    public void updateWorker(Worker worker) {
        checkWorker(worker);

        for (int i = 0; i < workers.size(); ++i) {
            if (workers.get(i).equals(worker)) {
                workers.set(i, worker);
                return;
            }
        }

        LogUtils.fatal(LOG, "worker {}({}) not exist in worker group when update.", worker.getWorkerId(), worker.getIpPort());
    }

    public List getWorkerList() {
        return workers;
    }

    public List getAllWorkerIds(boolean onlyAlive) {
        return workers.stream()
                .filter(x -> !onlyAlive || x.isAlive())
                .map(Worker::getWorkerId)
                .collect(Collectors.toList());
    }

    public int getWorkerCount() {
        return workers.size();
    }

    private void checkWorker(Worker worker) {
        if (!worker.getServiceId().equals(serviceId)) {
            LogUtils.fatal(LOG, "worker's service id {} not match service id {} in worker group.",
                    worker.getServiceId(), serviceId);
        }

        if (worker.getGroupId() != groupId) {
            LogUtils.fatal(LOG, "worker's group id {} not match group id {} in worker group.", worker.getGroupId(), groupId);
        }
    }
}