package com.nepxion.discovery.console.endpoint;

/**
 * <p>Title: Nepxion Discovery</p>
 * <p>Description: Nepxion Discovery</p>
 * <p>Copyright: Copyright (c) 2017-2050</p>
 * <p>Company: Nepxion</p>
 * @author Haojun Ren
 * @version 1.0
 */

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.nepxion.discovery.console.entity.InstanceEntity;
import com.nepxion.discovery.console.remote.ConfigAdapter;
import com.nepxion.discovery.console.rest.ConfigClearRestInvoker;
import com.nepxion.discovery.console.rest.ConfigUpdateRestInvoker;
import com.nepxion.discovery.console.rest.VersionClearRestInvoker;
import com.nepxion.discovery.console.rest.VersionUpdateRestInvoker;

@RestController
@Api(tags = { "控制台接口" })
public class ConsoleEndpoint {
    private static final Logger LOG = LoggerFactory.getLogger(ConsoleEndpoint.class);

    @Autowired
    private DiscoveryClient discoveryClient;

    @Autowired(required = false)
    private ConfigAdapter configAdapter;

    @Autowired
    private RestTemplate consoleRestTemplate;

    @RequestMapping(path = "/console/services", method = RequestMethod.GET)
    @ApiOperation(value = "获取服务注册中心的服务列表", notes = "", response = List.class, httpMethod = "GET")
    public List<String> services() {
        return getServices();
    }

    @RequestMapping(path = "/console/instances/{serviceId}", method = RequestMethod.GET)
    @ApiOperation(value = "获取服务注册中心服务的实例列表", notes = "", response = List.class, httpMethod = "GET")
    public List<ServiceInstance> instances(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId) {
        return getInstances(serviceId);
    }

    @RequestMapping(path = "/console/instance-list/{serviceId}", method = RequestMethod.GET)
    @ApiOperation(value = "获取服务注册中心服务的实例列表（精简数据）", notes = "", response = List.class, httpMethod = "GET")
    public List<InstanceEntity> instanceList(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId) {
        return getInstanceList(serviceId);
    }

    @RequestMapping(path = "/console/instance-map", method = RequestMethod.GET)
    @ApiOperation(value = "获取服务注册中心的服务和实例的Map（精简数据）", notes = "", response = Map.class, httpMethod = "GET")
    public Map<String, List<InstanceEntity>> instanceMap() {
        return getInstanceMap();
    }

    @RequestMapping(path = "/console/remote-config/update/{group}/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "推送更新规则配置信息到远程配置中心", notes = "", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> remoteConfigUpdate(@PathVariable(value = "group") @ApiParam(value = "组名", required = true) String group, @PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId, @RequestBody @ApiParam(value = "规则配置内容，XML格式", required = true) String config) {
        return executeRemoteConfigUpdate(group, serviceId, config);
    }

    @RequestMapping(path = "/console/remote-config/clear/{group}/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "清除规则配置信息到远程配置中心", notes = "", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> remoteConfigClear(@PathVariable(value = "group") @ApiParam(value = "组名", required = true) String group, @PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId) {
        return executeRemoteConfigClear(group, serviceId);
    }

    @RequestMapping(path = "/console/remote-config/view/{group}/{serviceId}", method = RequestMethod.GET)
    @ApiOperation(value = "查看远程配置中心的规则配置信息", notes = "", response = ResponseEntity.class, httpMethod = "GET")
    public ResponseEntity<?> remoteConfigView(@PathVariable(value = "group") @ApiParam(value = "组名", required = true) String group, @PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId) {
        return executeRemoteConfigView(group, serviceId);
    }

    @RequestMapping(path = "/console/config/update-async/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "批量异步推送更新规则配置信息", notes = "", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> configUpdateAsync(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId, @RequestBody @ApiParam(value = "规则配置内容，XML格式", required = true) String config) {
        return executeConfigUpdate(serviceId, config, true);
    }

    @RequestMapping(path = "/console/config/update-sync/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "批量同步推送更新规则配置信息", notes = "", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> configUpdateSync(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId, @RequestBody @ApiParam(value = "规则配置内容，XML格式", required = true) String config) {
        return executeConfigUpdate(serviceId, config, false);
    }

    @RequestMapping(path = "/console/config/clear/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "批量清除更新的规则配置信息", notes = "", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> configClear(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId) {
        return executeConfigClear(serviceId);
    }

    @RequestMapping(path = "/console/version/update/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "批量更新服务的动态版本", notes = "根据指定的localVersion更新服务的dynamicVersion。如果输入的localVersion不匹配服务的localVersion，则忽略；如果如果输入的localVersion为空，则直接更新服务的dynamicVersion", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> versionUpdate(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId, @RequestBody @ApiParam(value = "版本号，格式为[dynamicVersion]或者[dynamicVersion];[localVersion]", required = true) String version) {
        return executeVersionUpdate(serviceId, version);
    }

    @RequestMapping(path = "/console/version/clear/{serviceId}", method = RequestMethod.POST)
    @ApiOperation(value = "批量清除服务的动态版本", notes = "根据指定的localVersion清除服务的dynamicVersion。如果输入的localVersion不匹配服务的localVersion，则忽略；如果如果输入的localVersion为空，则直接清除服务的dynamicVersion", response = ResponseEntity.class, httpMethod = "POST")
    public ResponseEntity<?> versionClear(@PathVariable(value = "serviceId") @ApiParam(value = "服务名", required = true) String serviceId, @RequestBody(required = false) @ApiParam(value = "版本号，指localVersion，可以为空") String version) {
        return executeVersionClear(serviceId, version);
    }

    public List<String> getServices() {
        return discoveryClient.getServices();
    }

    public List<ServiceInstance> getInstances(String serviceId) {
        return discoveryClient.getInstances(serviceId);
    }

    public List<InstanceEntity> getInstanceList(String service) {
        List<ServiceInstance> serviceInstances = getInstances(service);
        List<InstanceEntity> instanceEntityList = new ArrayList<InstanceEntity>(serviceInstances.size());
        for (ServiceInstance serviceInstance : serviceInstances) {
            String serviceId = serviceInstance.getServiceId().toLowerCase();
            String version = serviceInstance.getMetadata().get("version");
            String host = serviceInstance.getHost();
            int port = serviceInstance.getPort();
            Map<String, String> metadata = serviceInstance.getMetadata();

            InstanceEntity instanceEntity = new InstanceEntity();
            instanceEntity.setServiceId(serviceId);
            instanceEntity.setVersion(version);
            instanceEntity.setHost(host);
            instanceEntity.setPort(port);
            instanceEntity.setMetadata(metadata);

            instanceEntityList.add(instanceEntity);
        }

        return instanceEntityList;
    }

    public Map<String, List<InstanceEntity>> getInstanceMap() {
        List<String> services = getServices();
        Map<String, List<InstanceEntity>> instanceMap = new LinkedHashMap<String, List<InstanceEntity>>(services.size());
        for (String service : services) {
            List<InstanceEntity> instanceEntityList = getInstanceList(service);
            instanceMap.put(service, instanceEntityList);
        }

        return instanceMap;
    }

    private ResponseEntity<?> executeRemoteConfigUpdate(String group, String serviceId, String config) {
        if (configAdapter == null) {
            LOG.error("Remote config adapter isn't provided");

            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Remote config adapter isn't provided");
        }

        try {
            boolean result = configAdapter.updateConfig(group, serviceId, config);

            return ResponseEntity.ok().body(result ? "OK" : "NO");
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(e.getMessage());
        }
    }

    private ResponseEntity<?> executeRemoteConfigClear(String group, String serviceId) {
        if (configAdapter == null) {
            LOG.error("Remote config adapter isn't provided");

            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Remote config adapter isn't provided");
        }

        try {
            boolean result = configAdapter.clearConfig(group, serviceId);

            return ResponseEntity.ok().body(result ? "OK" : "NO");
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(e.getMessage());
        }
    }

    private ResponseEntity<?> executeRemoteConfigView(String group, String serviceId) {
        if (configAdapter == null) {
            LOG.error("Remote config adapter isn't provided");

            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Remote config adapter isn't provided");
        }

        try {
            String config = configAdapter.getConfig(group, serviceId);

            return ResponseEntity.ok().body(config);
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(e.getMessage());
        }
    }

    private ResponseEntity<?> executeConfigUpdate(String serviceId, String config, boolean async) {
        List<ServiceInstance> serviceInstances = getInstances(serviceId);

        ConfigUpdateRestInvoker configUpdateRestInvoker = new ConfigUpdateRestInvoker(serviceInstances, consoleRestTemplate, config, async);

        return configUpdateRestInvoker.invoke();
    }

    private ResponseEntity<?> executeConfigClear(String serviceId) {
        List<ServiceInstance> serviceInstances = getInstances(serviceId);

        ConfigClearRestInvoker configClearRestInvoker = new ConfigClearRestInvoker(serviceInstances, consoleRestTemplate);

        return configClearRestInvoker.invoke();
    }

    private ResponseEntity<?> executeVersionUpdate(String serviceId, String version) {
        List<ServiceInstance> serviceInstances = getInstances(serviceId);

        VersionUpdateRestInvoker versionUpdateRestInvoker = new VersionUpdateRestInvoker(serviceInstances, consoleRestTemplate, version);

        return versionUpdateRestInvoker.invoke();
    }

    private ResponseEntity<?> executeVersionClear(String serviceId, String version) {
        List<ServiceInstance> serviceInstances = getInstances(serviceId);

        VersionClearRestInvoker versionClearRestInvoker = new VersionClearRestInvoker(serviceInstances, consoleRestTemplate, version);

        return versionClearRestInvoker.invoke();
    }
}