/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.shardingsphere.globalclock.distsql.parser.core;
  
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementBaseVisitor;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementParser.AlterGlobalClockRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementParser.GlobalClockRuleDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementParser.PropertiesDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementParser.PropertyContext;
  import org.apache.shardingsphere.distsql.parser.autogen.GlobalClockDistSQLStatementParser.ShowGlobalClockRuleContext;
  import org.apache.shardingsphere.globalclock.distsql.statement.queryable.ShowGlobalClockRuleStatement;
  import org.apache.shardingsphere.globalclock.distsql.statement.updatable.AlterGlobalClockRuleStatement;
  import org.apache.shardingsphere.sql.parser.api.ASTNode;
  import org.apache.shardingsphere.sql.parser.api.visitor.SQLVisitor;
  import org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue;
  
  import java.util.Properties;
  
  /**
   * SQL statement visitor for global clock DistSQL.
   */
  public final class GlobalClockDistSQLStatementVisitor extends GlobalClockDistSQLStatementBaseVisitor<ASTNode> implements SQLVisitor<ASTNode> {
      
      @Override
      public ASTNode visitShowGlobalClockRule(final ShowGlobalClockRuleContext ctx) {
          return new ShowGlobalClockRuleStatement();
      }
      
      @Override
      public ASTNode visitAlterGlobalClockRule(final AlterGlobalClockRuleContext ctx) {
          GlobalClockRuleDefinitionContext ruleDefinitionContext = ctx.globalClockRuleDefinition();
          return new AlterGlobalClockRuleStatement(getIdentifierValue(ruleDefinitionContext.typeDefinition().typeName()), getIdentifierValue(ruleDefinitionContext.providerDefinition().providerName()),
                  Boolean.parseBoolean(getIdentifierValue(ruleDefinitionContext.enabledDefinition().enabled())), getProperties(ruleDefinitionContext.propertiesDefinition()));
      }
      
      private String getIdentifierValue(final ParseTree context) {
          return null == context ? null : new IdentifierValue(context.getText()).getValue();
      }
      
      private Properties getProperties(final PropertiesDefinitionContext ctx) {
          Properties result = new Properties();
          if (null == ctx || null == ctx.properties()) {
              return result;
          }
          for (PropertyContext each : ctx.properties().property()) {
              result.setProperty(IdentifierValue.getQuotedContent(each.key.getText()), IdentifierValue.getQuotedContent(each.value.getText()));
          }
          return result;
      }
  }