package com.ctrip.apollo.portal.service;

 import com.google.gson.Gson;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

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

 import org.springframework.http.HttpStatus;

 import org.springframework.stereotype.Service;

 import org.springframework.util.CollectionUtils;

 import org.springframework.web.client.HttpClientErrorException;

 import com.ctrip.apollo.common.utils.BeanUtils;

 import com.ctrip.apollo.common.utils.ExceptionUtils;

 import com.ctrip.apollo.core.enums.Env;

 import com.ctrip.apollo.core.dto.ItemChangeSets;

 import com.ctrip.apollo.core.dto.ItemDTO;

 import com.ctrip.apollo.core.dto.NamespaceDTO;

 import com.ctrip.apollo.core.dto.ReleaseDTO;

 import com.ctrip.apollo.core.exception.BadRequestException;

 import com.ctrip.apollo.core.exception.NotFoundException;

 import com.ctrip.apollo.core.exception.ServiceException;

 import com.ctrip.apollo.core.utils.StringUtils;

 import com.ctrip.apollo.portal.api.AdminServiceAPI;

 import com.ctrip.apollo.portal.entity.ItemDiffs;

 import com.ctrip.apollo.portal.entity.NamespaceIdentifer;

 import com.ctrip.apollo.portal.entity.form.NamespaceTextModel;

 import com.ctrip.apollo.portal.entity.NamespaceVO;

 import com.ctrip.apollo.portal.entity.form.NamespaceReleaseModel;

 import com.ctrip.apollo.portal.service.txtresolver.ConfigTextResolver;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.LinkedList;

 import java.util.List;

 import java.util.Map;

 @Service

 public class ConfigService {

   private Logger logger = LoggerFactory.getLogger(ConfigService.class);

   @Autowired

   private AdminServiceAPI.NamespaceAPI namespaceAPI;

   @Autowired

   private AdminServiceAPI.ItemAPI itemAPI;

   @Autowired

   private AdminServiceAPI.ReleaseAPI releaseAPI;

   @Autowired

   private ConfigTextResolver resolver;

   /**

    * parse config text and update config items

    *

    * @return parse result

    */

   public void updateConfigItemByText(NamespaceTextModel model) {

     String appId = model.getAppId();

     Env env = model.getEnv();

     String clusterName = model.getClusterName();

     String namespaceName = model.getNamespaceName();

     long namespaceId = model.getNamespaceId();

     String configText = model.getConfigText();

     ItemChangeSets changeSets = resolver.resolve(namespaceId, configText,

                                                  itemAPI.findItems(appId, env, clusterName, namespaceName));

     if (changeSets.isEmpty()) {

       return;

     }

     try {

       itemAPI.updateItems(appId, env, clusterName, namespaceName, changeSets);

     } catch (Exception e) {

       logger.error("itemAPI.updateItems error. appId{},env:{},clusterName:{},namespaceName:{}", appId, env, clusterName,

                    namespaceName);

       throw new ServiceException(e.getMessage());

     }

   }

   /**

    * createRelease config items

    */

   public ReleaseDTO createRelease(NamespaceReleaseModel model) {

     return releaseAPI.release(model.getAppId(), model.getEnv(), model.getClusterName(),

                               model.getNamespaceName(), model.getReleaseBy(), model.getReleaseComment());

   }

   public List<ItemDTO> findItems(String appId, Env env, String clusterName, String namespaceName) {

     return itemAPI.findItems(appId, env, clusterName, namespaceName);

   }

   public void syncItems(List<NamespaceIdentifer> comparedNamespaces, List<ItemDTO> sourceItems){

     List<ItemDiffs> itemDiffs = compare(comparedNamespaces, sourceItems);

     for (ItemDiffs itemDiff: itemDiffs){

       NamespaceIdentifer namespaceIdentifer = itemDiff.getNamespace();

       try {

         itemAPI

             .updateItems(namespaceIdentifer.getAppId(), namespaceIdentifer.getEnv(),

                          namespaceIdentifer.getClusterName(),

                          namespaceIdentifer.getNamespaceName(), itemDiff.getDiffs());

       } catch (HttpClientErrorException e) {

         logger.error("sync items error. namespace:{}", namespaceIdentifer);

         throw new ServiceException(String.format("sync item error. env:%s, clusterName:%s", namespaceIdentifer.getEnv(),

                                                  namespaceIdentifer.getClusterName()), e);

       }

     }

   }

   public List<ItemDiffs> compare(List<NamespaceIdentifer> comparedNamespaces, List<ItemDTO> sourceItems) {

     List<ItemDiffs> result = new LinkedList<>();

     for (NamespaceIdentifer namespace : comparedNamespaces) {

       ItemDiffs itemDiffs = new ItemDiffs(namespace);

       itemDiffs.setDiffs(parseChangeSets(namespace, sourceItems));

       result.add(itemDiffs);

     }

     return result;

   }

   private long getNamespaceId(NamespaceIdentifer namespaceIdentifer) {

     String appId = namespaceIdentifer.getAppId();

     String clusterName = namespaceIdentifer.getClusterName();

     String namespaceName = namespaceIdentifer.getNamespaceName();

     Env env = namespaceIdentifer.getEnv();

     NamespaceDTO namespaceDTO = null;

     try {

       namespaceDTO = namespaceAPI.loadNamespace(appId, env, clusterName, namespaceName);

     } catch (NotFoundException e) {

       logger.warn("namespace not exist. appId:{}, env:{}, clusterName:{}, namespaceName:{}", appId, env, clusterName,

                   namespaceName);

       throw new BadRequestException(String.format(

           "namespace not exist. appId:%s, env:%s, clusterName:%s, namespaceName:%s", appId, env, clusterName,

           namespaceName));

     }

     return namespaceDTO.getId();

   }

   private ItemChangeSets parseChangeSets(NamespaceIdentifer namespace, List<ItemDTO> sourceItems){

     ItemChangeSets changeSets = new ItemChangeSets();

     List<ItemDTO>

         targetItems =

         itemAPI.findItems(namespace.getAppId(), namespace.getEnv(),

                           namespace.getClusterName(), namespace.getNamespaceName());

     long namespaceId = getNamespaceId(namespace);

     if (CollectionUtils.isEmpty(targetItems)) {//all source items is added

       int lineNum = 1;

       for (ItemDTO sourceItem : sourceItems) {

         changeSets.addCreateItem(buildItem(namespaceId, lineNum++, sourceItem));

       }

     } else {

       Map<String, ItemDTO> keyMapItem = BeanUtils.mapByKey("key", targetItems);

       String key, sourceValue, sourceComment;

       ItemDTO targetItem = null;

       int maxLineNum = targetItems.size();//append to last

       for (ItemDTO sourceItem : sourceItems) {

         key = sourceItem.getKey();

         sourceValue = sourceItem.getValue();

         sourceComment = sourceItem.getComment();

         targetItem = keyMapItem.get(key);

         if (targetItem == null) {//added items

           changeSets.addCreateItem(buildItem(namespaceId, ++maxLineNum, sourceItem));

         } else if (!sourceValue.equals(targetItem.getValue()) || !sourceComment

             .equals(targetItem.getComment())) {//modified items

           targetItem.setValue(sourceValue);

           targetItem.setComment(sourceComment);

           changeSets.addUpdateItem(targetItem);

         }

       }

     }

     return changeSets;

   }

   private ItemDTO buildItem(long namespaceId, int lineNum, ItemDTO sourceItem) {

     ItemDTO createdItem = new ItemDTO();

     BeanUtils.copyEntityProperties(sourceItem, createdItem);

     createdItem.setLineNum(lineNum++);

     createdItem.setNamespaceId(namespaceId);

     return createdItem;

   }

 }