/*
 * 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.dolphinscheduler.api.service.impl;

import org.apache.dolphinscheduler.api.enums.Status;
import org.apache.dolphinscheduler.api.service.MonitorService;
import org.apache.dolphinscheduler.api.utils.RegistryCenterUtils;
import org.apache.dolphinscheduler.common.Constants;
import org.apache.dolphinscheduler.common.model.Server;
import org.apache.dolphinscheduler.common.model.WorkerServerModel;
import org.apache.dolphinscheduler.dao.MonitorDBDao;
import org.apache.dolphinscheduler.dao.entity.MonitorRecord;
import org.apache.dolphinscheduler.dao.entity.User;
import org.apache.dolphinscheduler.dao.entity.ZookeeperRecord;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.google.common.collect.Sets;

/**
 * monitor service impl
 */
@Service
public class MonitorServiceImpl extends BaseServiceImpl implements MonitorService {

    @Autowired
    private MonitorDBDao monitorDBDao;

    /**
     * query database state
     *
     * @param loginUser login user
     * @return data base state
     */
    @Override
    public Map<String,Object> queryDatabaseState(User loginUser) {
        Map<String, Object> result = new HashMap<>();

        List<MonitorRecord> monitorRecordList = monitorDBDao.queryDatabaseState();

        result.put(Constants.DATA_LIST, monitorRecordList);
        putMsg(result, Status.SUCCESS);

        return result;

    }

    /**
     * query master list
     *
     * @param loginUser login user
     * @return master information list
     */
    @Override
    public Map<String,Object> queryMaster(User loginUser) {

        Map<String, Object> result = new HashMap<>();

        List<Server> masterServers = getServerListFromRegistry(true);
        result.put(Constants.DATA_LIST, masterServers);
        putMsg(result,Status.SUCCESS);

        return result;
    }

    /**
     * query zookeeper state
     *
     * @param loginUser login user
     * @return zookeeper information list
     */
    @Override
    public Map<String,Object> queryZookeeperState(User loginUser) {
        Map<String, Object> result = new HashMap<>();

        List<ZookeeperRecord> zookeeperRecordList = RegistryCenterUtils.zookeeperInfoList();

        result.put(Constants.DATA_LIST, zookeeperRecordList);
        putMsg(result, Status.SUCCESS);

        return result;

    }

    /**
     * query worker list
     *
     * @param loginUser login user
     * @return worker information list
     */
    @Override
    public Map<String,Object> queryWorker(User loginUser) {

        Map<String, Object> result = new HashMap<>();
        List<WorkerServerModel> workerServers = getServerListFromRegistry(false)
                .stream()
                .map((Server server) -> {
                    WorkerServerModel model = new WorkerServerModel();
                    model.setId(server.getId());
                    model.setHost(server.getHost());
                    model.setPort(server.getPort());
                    model.setZkDirectories(Sets.newHashSet(server.getZkDirectory()));
                    model.setResInfo(server.getResInfo());
                    model.setCreateTime(server.getCreateTime());
                    model.setLastHeartbeatTime(server.getLastHeartbeatTime());
                    return model;
                })
                .collect(Collectors.toList());

        Map<String, WorkerServerModel> workerHostPortServerMapping = workerServers
                .stream()
                .collect(Collectors.toMap(
                    (WorkerServerModel worker) -> {
                        String[] s = worker.getZkDirectories().iterator().next().split("/");
                        return s[s.length - 1];
                    }
                    , Function.identity()
                    , (WorkerServerModel oldOne, WorkerServerModel newOne) -> {
                        oldOne.getZkDirectories().addAll(newOne.getZkDirectories());
                        return oldOne;
                    }));

        result.put(Constants.DATA_LIST, workerHostPortServerMapping.values());
        putMsg(result,Status.SUCCESS);

        return result;
    }

    @Override
    public List<Server> getServerListFromRegistry(boolean isMaster) {
        return isMaster ? RegistryCenterUtils.getMasterServers() : RegistryCenterUtils.getWorkerServers();
    }

}
