/*
    * SymmetricDS is an open source database synchronization solution.
    *   
    * Copyright (C) Chris Henson <chenson42@users.sourceforge.net>
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 3 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, see
   * <http://www.gnu.org/licenses/>.
   */
  
  package org.jumpmind.symmetric.db.oracle;
  
  import java.net.URL;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.jumpmind.symmetric.db.AbstractDbDialect;
  import org.jumpmind.symmetric.db.BinaryEncoding;
  import org.jumpmind.symmetric.db.IDbDialect;
  import org.jumpmind.symmetric.db.SequenceIdentifier;
  import org.jumpmind.symmetric.db.SqlScript;
  import org.jumpmind.symmetric.model.Trigger;
  import org.jumpmind.symmetric.model.TriggerHistory;
  
  public class OracleDbDialect extends AbstractDbDialect implements IDbDialect {
  
      static final Log logger = LogFactory.getLog(OracleDbDialect.class);
  
      static final String TRANSACTION_ID_FUNCTION_NAME = "fn_transaction_id";
  
      static final String PACKAGE = "pack_symmetric";
  
      static final String ORACLE_OBJECT_TYPE = "FUNCTION";
  
      @Override
      protected void initForSpecificDialect() {
          try {
              if (!isPackageUpToDate(PACKAGE)) {
                  logger.info("Creating package " + PACKAGE);
                  new SqlScript(getSqlScriptUrl(), getPlatform().getDataSource(), '/').execute();
              }
          } catch (Exception ex) {
              logger.error("Error while initializing Oracle.", ex);
          }
      }
  
      private URL getSqlScriptUrl() {
          return getClass().getResource("/dialects/oracle.sql");
      }
  
      private boolean isPackageUpToDate(String name) throws Exception {
          return jdbcTemplate.queryForInt("select count(*) from user_objects where object_name= upper(?) ",
                  new Object[] { name }) > 0;
      }
  
      public BinaryEncoding getBinaryEncoding() {
          return BinaryEncoding.BASE64;
      }
  
      public boolean isCharSpacePadded() {
          return true;
      }
  
      public boolean isCharSpaceTrimmed() {
          return false;
      }
  
      public boolean isEmptyStringNulled() {
          return true;
      }
  
      public boolean isBlobOverrideToBinary() {
          return true;
      }
  
      public boolean isDateOverrideToTimestamp() {
          return true;
      }
  
      public void removeTrigger(String schemaName, String triggerName) {
          schemaName = schemaName == null ? "" : (schemaName + ".");
          triggerName = schemaName + triggerName;
          try {            
              jdbcTemplate.update("drop trigger " + triggerName);
              logger.info("Removed trigger " + triggerName);
          } catch (Exception e) {
              logger.warn("Trigger " + triggerName + " could not be removed.  It does not exist");
          }
      }
 
     public void removeTrigger(String catalogName, String schemaName, String triggerName, String tableName, TriggerHistory oldHistory) {
         removeTrigger(schemaName, triggerName);
     }
 
     public String getTransactionTriggerExpression(Trigger trigger) {
         return TRANSACTION_ID_FUNCTION_NAME + "()";
     }
 
     @Override
     public boolean supportsTransactionId() {
         return true;
     }
     
     @Override
     protected String getSequenceName(SequenceIdentifier identifier) {
         switch (identifier) {
         case OUTGOING_BATCH:
             return "SEQ_SYM_OUTGOIN_BATCH_BATCH_ID";
         case DATA:
             return "SEQ_SYM_DATA_DATA_ID";
         case TRIGGER_HIST:
             return "SEQ_SYM_TRIGGER_RIGGER_HIST_ID";
         }
         return null;
     }
 
     public String getSelectLastInsertIdSql(String sequenceName) {
         return "select " + sequenceName + ".currval from dual";
     }
 
     @Override
     protected boolean doesTriggerExistOnPlatform(String catalog, String schema, String tableName, String triggerName) {
         return jdbcTemplate.queryForInt(
                 "select count(*) from user_triggers where trigger_name like upper(?) and table_name like upper(?)",
                 new Object[] { triggerName, tableName }) > 0;
     }
 
     public boolean storesUpperCaseNamesInCatalog() {
         return true;
     }
 
     public void purge() {
         jdbcTemplate.update("purge recyclebin");
     }
 
     public void disableSyncTriggers(String nodeId) {
         jdbcTemplate.update("call pack_symmetric.setValue(1)");
         if (nodeId != null) {
             jdbcTemplate.update("call pack_symmetric.setNodeValue('" + nodeId + "')");
         }
     }
 
     public void enableSyncTriggers() {
         jdbcTemplate.update("call pack_symmetric.setValue(null)");
         jdbcTemplate.update("call pack_symmetric.setNodeValue(null)");
     }
 
     public String getSyncTriggersExpression() {
         return "fn_trigger_disabled() is null";
     }
 
     public String getDefaultCatalog() {
         return null;
     }
 
     public String getDefaultSchema() {
         return (String) jdbcTemplate.queryForObject("SELECT sys_context('USERENV', 'CURRENT_SCHEMA') FROM dual",
                 String.class);
     }
     
     
 
 }