/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.alibaba.nacos.naming.controllers;

import com.alibaba.nacos.auth.annotation.Secured;
import com.alibaba.nacos.common.utils.InternetAddressUtil;
import com.alibaba.nacos.common.utils.JacksonUtils;
import com.alibaba.nacos.core.controller.compatibility.Compatibility;
import com.alibaba.nacos.core.paramcheck.ExtractorManager;
import com.alibaba.nacos.core.utils.WebUtils;
import com.alibaba.nacos.naming.cluster.ServerStatusManager;
import com.alibaba.nacos.naming.constants.ClientConstants;
import com.alibaba.nacos.naming.core.DistroMapper;
import com.alibaba.nacos.naming.core.v2.client.Client;
import com.alibaba.nacos.naming.core.v2.client.impl.IpPortBasedClient;
import com.alibaba.nacos.naming.core.v2.client.manager.ClientManager;
import com.alibaba.nacos.naming.misc.Loggers;
import com.alibaba.nacos.naming.misc.SwitchDomain;
import com.alibaba.nacos.naming.misc.SwitchEntry;
import com.alibaba.nacos.naming.misc.SwitchManager;
import com.alibaba.nacos.naming.misc.UtilsAndCommons;
import com.alibaba.nacos.naming.monitor.MetricsMonitor;
import com.alibaba.nacos.naming.paramcheck.NamingDefaultHttpParamExtractor;
import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
import com.alibaba.nacos.plugin.auth.constant.ApiType;
import com.alibaba.nacos.sys.env.EnvUtil;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import jakarta.servlet.http.HttpServletRequest;
import java.util.Collection;

/**
 * Operation for operators.
 *
 * @author nkorange
 */
@RestController
@RequestMapping({UtilsAndCommons.NACOS_NAMING_CONTEXT + UtilsAndCommons.NACOS_NAMING_OPERATOR_CONTEXT,
        UtilsAndCommons.NACOS_NAMING_CONTEXT + "/ops"})
@ExtractorManager.Extractor(httpExtractor = NamingDefaultHttpParamExtractor.class)
public class OperatorController {
    
    private final SwitchManager switchManager;
    
    private final ServerStatusManager serverStatusManager;
    
    private final SwitchDomain switchDomain;
    
    private final DistroMapper distroMapper;
    
    private final ClientManager clientManager;
    
    public OperatorController(SwitchManager switchManager, ServerStatusManager serverStatusManager,
            SwitchDomain switchDomain, DistroMapper distroMapper,
            ClientManager clientManager) {
        this.switchManager = switchManager;
        this.serverStatusManager = serverStatusManager;
        this.switchDomain = switchDomain;
        this.distroMapper = distroMapper;
        this.clientManager = clientManager;
    }
    
    /**
     * Get push metric status.
     *
     * @param detail whether return detail information
     * @param reset  whether reset metric information after return information
     * @return push metric status
     */
    @RequestMapping("/push/state")
    @Compatibility(apiType = ApiType.ADMIN_API)
    public ObjectNode pushState(@RequestParam(required = false) boolean detail,
            @RequestParam(required = false) boolean reset) {
        ObjectNode result = JacksonUtils.createEmptyJsonNode();
        int failedPushCount = MetricsMonitor.getFailedPushMonitor().get();
        int totalPushCount = MetricsMonitor.getTotalPushMonitor().get();
        result.put("succeed", totalPushCount - failedPushCount);
        result.put("total", totalPushCount);
        if (totalPushCount > 0) {
            result.put("ratio", ((float) totalPushCount - failedPushCount) / totalPushCount);
        } else {
            result.put("ratio", 0);
        }
        if (detail) {
            ObjectNode detailNode = JacksonUtils.createEmptyJsonNode();
            detailNode.put("avgPushCost", MetricsMonitor.getAvgPushCostMonitor().get());
            detailNode.put("maxPushCost", MetricsMonitor.getMaxPushCostMonitor().get());
            result.replace("detail", detailNode);
        }
        if (reset) {
            MetricsMonitor.resetPush();
        }
        result.put("reset", reset);
        return result;
    }
    
    /**
     * Get switch information.
     *
     * @param request no used
     * @return switchDomain
     */
    @GetMapping("/switches")
    @Compatibility(apiType = ApiType.ADMIN_API)
    public SwitchDomain switches(HttpServletRequest request) {
        return switchDomain;
    }
    
    /**
     * Update switch information.
     *
     * @param debug whether debug
     * @param entry item entry of switch, {@link SwitchEntry}
     * @param value switch value
     * @return 'ok' if success
     * @throws Exception exception
     */
    @Secured(resource = "naming/switches", action = ActionTypes.WRITE)
    @PutMapping("/switches")
    @Compatibility(apiType = ApiType.ADMIN_API)
    public String updateSwitch(@RequestParam(required = false) boolean debug, @RequestParam String entry,
            @RequestParam String value) throws Exception {
        
        switchManager.update(entry, value, debug);
        
        return "ok";
    }
    
    /**
     * Get metrics information.
     *
     * @param request request
     * @return metrics information
     */
    @GetMapping("/metrics")
    @Compatibility(apiType = ApiType.OPEN_API)
    public ObjectNode metrics(HttpServletRequest request) {
        boolean onlyStatus = Boolean.parseBoolean(WebUtils.optional(request, "onlyStatus", "true"));
        ObjectNode result = JacksonUtils.createEmptyJsonNode();
        result.put("status", serverStatusManager.getServerStatus().name());
        if (onlyStatus) {
            return result;
        }
        Collection<String> allClientId = clientManager.allClientId();
        int connectionBasedClient = 0;
        int ephemeralIpPortClient = 0;
        int persistentIpPortClient = 0;
        int responsibleClientCount = 0;
        int responsibleIpCount = 0;
        for (String clientId : allClientId) {
            if (clientId.contains(IpPortBasedClient.ID_DELIMITER)) {
                if (clientId.endsWith(ClientConstants.PERSISTENT_SUFFIX)) {
                    persistentIpPortClient += 1;
                } else {
                    ephemeralIpPortClient += 1;
                }
            } else {
                connectionBasedClient += 1;
            }
            Client client = clientManager.getClient(clientId);
            if (clientManager.isResponsibleClient(client)) {
                responsibleClientCount += 1;
                responsibleIpCount += client.getAllPublishedService().size();
            }
        }
        result.put("serviceCount", MetricsMonitor.getDomCountMonitor().get());
        result.put("instanceCount", MetricsMonitor.getIpCountMonitor().get());
        result.put("subscribeCount", MetricsMonitor.getSubscriberCount().get());
        result.put("responsibleInstanceCount", responsibleIpCount);
        result.put("clientCount", allClientId.size());
        result.put("connectionBasedClientCount", connectionBasedClient);
        result.put("ephemeralIpPortClientCount", ephemeralIpPortClient);
        result.put("persistentIpPortClientCount", persistentIpPortClient);
        result.put("responsibleClientCount", responsibleClientCount);
        result.put("cpu", EnvUtil.getCpu());
        result.put("load", EnvUtil.getLoad());
        result.put("mem", EnvUtil.getMem());
        return result;
    }
    
    @GetMapping("/distro/client")
    @Compatibility(apiType = ApiType.ADMIN_API)
    public ObjectNode getResponsibleServer4Client(@RequestParam String ip, @RequestParam String port) {
        ObjectNode result = JacksonUtils.createEmptyJsonNode();
        String tag = ip + InternetAddressUtil.IP_PORT_SPLITER + port;
        result.put("responsibleServer", distroMapper.mapSrv(tag));
        return result;
    }
    
    @PutMapping("/log")
    @Compatibility(apiType = ApiType.ADMIN_API)
    public String setLogLevel(@RequestParam String logName, @RequestParam String logLevel) {
        Loggers.setLogLevel(logName, logLevel);
        return "ok";
    }
}
