package org.kuali.ole.docstore.discovery.util;
   
   import java.io.File;
   import java.io.IOException;
   import java.util.ArrayList;
   import java.util.List;
   
   import org.apache.commons.io.FileUtils;
   import org.apache.commons.lang.StringUtils;
  import org.kuali.ole.utility.Constants;
  import org.kuali.ole.utility.ResourceItem;
  import org.kuali.ole.utility.ResourceUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Created by IntelliJ IDEA. User: Sreekanth Date: 6/6/12 Time: 2:41 PM To change this template use File | Settings | File Templates.
   */
  public class DiscoveryEnvUtil {
      private static final Logger LOG = LoggerFactory.getLogger(DiscoveryEnvUtil.class);
      public static final String DISCOVERY_ROOT_DIR = "discovery";
      public static final String DISCOVERY_ROOT_DEFAULT = "/opt/docstore/" + DISCOVERY_ROOT_DIR;
      public static final String DISCOVERY_ROOT_TEST_DEFAULT = System.getProperty("user.home")+"/kuali/main/local/docstore-test/discovery-test";
      public static final String SOLR_CONFIG_FOLDER = "solr-config";
      public static final String SOLR_DATA_FOLDER = "solr-indexes";
      public static final String DISCOVERY_PROPERTIES_FOLDER = "properties";
      public static final String DISCOVERY_PROPERTIES_FILE = "ole-discovery.properties";
      public static final String UTF8 = "UTF-8";
  
      protected String rootFolderPath;
      protected String solrConfigFolderPath;
      protected String solrDataFolderPath;
      protected String discoveryPropertyFolderPath;
      protected String discoveryPropertiesFilePath;
      private boolean testEnv = false;
      ResourceUtil resourceUtil = new ResourceUtil();
  
      /**
       * Initializes environment for normal use of discovery. This should be called during web app initialization.
       */
      public void initEnvironment() {
          initEnv(DISCOVERY_ROOT_DEFAULT);
      }
  
      /**
       * Initializes environment for testing. This should be called in all test cases.
       */
      public void initTestEnvironment() {
          testEnv = true;
          initEnv(DISCOVERY_ROOT_TEST_DEFAULT);
      }
  
      /**
       * Configure the home directory for discovery. When this method return, the system property <code>ole.discover.home</code> is guaranteed to be set.
       */
      protected void initEnv(String defaultDiscoveryHome) {
          String discoveryHome = getDiscoveryHome(defaultDiscoveryHome);
          LOG.info(Constants.OLE_DISCOVERY_HOME_SYSTEM_PROPERTY + "=" + discoveryHome);
          System.setProperty(Constants.OLE_DISCOVERY_HOME_SYSTEM_PROPERTY, discoveryHome);
          initEnvironmentCommon(discoveryHome);
      }
  
      /**
       * Logic for determining the correct home directory for discovery. The directory to use can be configured by system property settings. If no system property is set, discovery
       * home becomes a path relative to docstore home. If docstore home is not set, it falls through to the default value.
       */
      public String getDiscoveryHome(String defaultDiscoveryHome) {
          String direct = System.getProperty(Constants.OLE_DISCOVERY_HOME_SYSTEM_PROPERTY);
          if (!StringUtils.isBlank(direct)) {
              return direct;
          }
          String docstoreHome = System.getProperty(Constants.OLE_DOCSTORE_HOME_SYSTEM_PROPERTY);
          if (StringUtils.isBlank(docstoreHome)) {
              return defaultDiscoveryHome;
          } else {
              return docstoreHome + "/" + DISCOVERY_ROOT_DIR;
          }
      }
  
      public void initPathValues(String discoveryRoot) {
          rootFolderPath = discoveryRoot;
          solrConfigFolderPath = discoveryRoot.concat("/").concat(SOLR_CONFIG_FOLDER);
          solrDataFolderPath = discoveryRoot.concat("/").concat(SOLR_DATA_FOLDER);
          discoveryPropertyFolderPath = discoveryRoot.concat("/").concat(DISCOVERY_PROPERTIES_FOLDER);
          discoveryPropertiesFilePath = discoveryPropertyFolderPath.concat("/").concat(DISCOVERY_PROPERTIES_FILE);
      }
  
      /**
       * Initializes an environment for discovery at the given root folder. Looks for necessary folders and files under the root folder. Any resources that already exist are left
       * untouched. Any that are missing are created using default values.
       */
      public void initEnvironmentCommon(String docStoreRoot) {
          initPathValues(docStoreRoot);
          handleSolrConfig();
          List<ResourceItem> resourceItems = getResourceItems();
          for (ResourceItem item : resourceItems) {
              resourceUtil.validate(item);
          }
      }
 
     protected void handleSolrConfig() {
         String srcLoc = "";
         try {
             File solrConfigDir = new File(solrConfigFolderPath);
             // The directory already exists, leave it alone
             if (solrConfigDir.isDirectory()) {
                 return;
             }
             if (testEnv) {
                 String path = getClass().getClassLoader().getResource(".").getPath();
                 srcLoc = "File:" + path + "/../../../ole-docstore-webapp/src/main/resources/solrconfig";
             } else {
                 srcLoc = "classpath:solrconfig";
             }
             File srcDir = resourceUtil.getFile(srcLoc);
             LOG.info("***** Begin Solr Config *****");
             LOG.info("Source Loc: " + srcLoc);
             LOG.info("Source Dir: " + srcDir);
             LOG.info("Dest Dir: " + solrConfigDir);
             LOG.info("Copying source dir to dest dir...");
 
             resourceUtil.copyDirectory(srcLoc, solrConfigDir);
             File solrConfigXmlFile = new File(solrConfigFolderPath + "/bib/conf/solrconfig.xml");
             LOG.info("Updating " + solrConfigXmlFile);
             String oldContent = FileUtils.readFileToString(solrConfigXmlFile, UTF8);
             int beginIndex = oldContent.indexOf("<dataDir>");
             int endIndex = oldContent.indexOf("</dataDir>");
             String oldValue = oldContent.substring(beginIndex, endIndex).concat("</dataDir>");
             String newValue = "<dataDir>" + solrDataFolderPath + "</dataDir>";
             LOG.info("Setting datadir=" + solrDataFolderPath);
             String newContent = oldContent.replace(oldValue, newValue);
             FileUtils.writeStringToFile(solrConfigXmlFile, newContent, UTF8);
             LOG.info("***** End Solr Config *****");
         } catch (IOException e) {
             throw new IllegalArgumentException(e);
         }
 
     }
 
     /**
      * Return a list of <code>ResourceItem</code> objects representing resources required by discovery
      */
     protected List<ResourceItem> getResourceItems() {
         ResourceItem solrConfigFolder = new ResourceItem();
         solrConfigFolder.setDestination(new File(solrConfigFolderPath));
         solrConfigFolder.setSystemProperty("solr.solr.home");
         solrConfigFolder.setLocalDirectory(true);
 
         // ResourceItem discoveryPropertiesFile = new ResourceItem();
         // discoveryPropertiesFile.setDestination(new File(discoveryPropertiesFilePath));
         // discoveryPropertiesFile.setSystemProperty("discovery.properties.file");
         // discoveryPropertiesFile.setSourceLocation("classpath:ole-discovery.properties");
 
         List<ResourceItem> items = new ArrayList<ResourceItem>();
         items.add(solrConfigFolder);
         // items.add(discoveryPropertiesFile);
         return items;
     }
 
     public void printEnvironment() {
 
         // initEnvironmentCommon(SOLR_CONFIG_FOLDER);
         System.out.println("**********{{ Discovery Environment **********");
         System.out.println(Constants.OLE_DISCOVERY_HOME_SYSTEM_PROPERTY + "=" + rootFolderPath);
         System.out.println("solrConfigFolderPath=" + solrConfigFolderPath);
         System.out.println("solrDataFolderPath=" + solrDataFolderPath);
         System.out.println("discoveryPropertyFolderPath=" + discoveryPropertyFolderPath);
         System.out.println("discoveryPropertiesFilePath=" + discoveryPropertiesFilePath);
         System.out.println("**********}} Discovery Environment **********");
     }
 
     public void logEnvironment() {
         LOG.info("**********{{ Discovery Environment **********");
         LOG.info(Constants.OLE_DISCOVERY_HOME_SYSTEM_PROPERTY + "=" + rootFolderPath);
         LOG.info("solrConfigFolderPath=" + solrConfigFolderPath);
         LOG.info("solrDataFolderPath=" + solrDataFolderPath);
         LOG.info("discoveryPropertyFolderPath=" + discoveryPropertyFolderPath);
         LOG.info("discoveryPropertiesFilePath=" + discoveryPropertiesFilePath);
         LOG.info("**********}} Discovery Environment **********");
 
     }
 
     public String getRootFolderPath() {
         return rootFolderPath;
     }
 
     public void setRootFolderPath(String rootFolderPath) {
         this.rootFolderPath = rootFolderPath;
     }
 
     public String getSolrConfigFolderPath() {
         return solrConfigFolderPath;
     }
 
     public void setSolrConfigFolderPath(String solrConfigFolderPath) {
         this.solrConfigFolderPath = solrConfigFolderPath;
     }
 
     public String getSolrDataFolderPath() {
         return solrDataFolderPath;
     }
 
     public void setSolrDataFolderPath(String solrDataFolderPath) {
         this.solrDataFolderPath = solrDataFolderPath;
     }
 
     public String getDiscoveryPropertyFolderPath() {
         return discoveryPropertyFolderPath;
     }
 
     public void setDiscoveryPropertyFolderPath(String discoveryPropertyFolderPath) {
         this.discoveryPropertyFolderPath = discoveryPropertyFolderPath;
     }
 
     public String getDiscoveryPropertiesFilePath() {
         return discoveryPropertiesFilePath;
     }
 
     public void setDiscoveryPropertiesFilePath(String discoveryPropertiesFilePath) {
         this.discoveryPropertiesFilePath = discoveryPropertiesFilePath;
     }
 }