/*
    * 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.mask.distsql.parser.core;
  
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementBaseVisitor;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.AlgorithmDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.AlterMaskRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.ColumnDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.CountMaskRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.CreateMaskRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.DatabaseNameContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.DropMaskRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.MaskRuleDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.PropertiesDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.PropertyContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.ShowMaskAlgorithmPluginsContext;
  import org.apache.shardingsphere.distsql.parser.autogen.MaskDistSQLStatementParser.ShowMaskRulesContext;
  import org.apache.shardingsphere.distsql.segment.AlgorithmSegment;
  import org.apache.shardingsphere.distsql.statement.ral.queryable.show.ShowPluginsStatement;
  import org.apache.shardingsphere.distsql.statement.rql.rule.database.CountRuleStatement;
  import org.apache.shardingsphere.infra.database.core.metadata.database.enums.QuoteCharacter;
  import org.apache.shardingsphere.mask.distsql.segment.MaskColumnSegment;
  import org.apache.shardingsphere.mask.distsql.segment.MaskRuleSegment;
  import org.apache.shardingsphere.mask.distsql.statement.AlterMaskRuleStatement;
  import org.apache.shardingsphere.mask.distsql.statement.CreateMaskRuleStatement;
  import org.apache.shardingsphere.mask.distsql.statement.DropMaskRuleStatement;
  import org.apache.shardingsphere.mask.distsql.statement.ShowMaskRulesStatement;
  import org.apache.shardingsphere.sql.parser.api.ASTNode;
  import org.apache.shardingsphere.sql.parser.api.visitor.SQLVisitor;
  import org.apache.shardingsphere.sql.parser.statement.core.segment.dal.FromDatabaseSegment;
  import org.apache.shardingsphere.sql.parser.statement.core.segment.generic.DatabaseSegment;
  import org.apache.shardingsphere.sql.parser.statement.core.value.identifier.IdentifierValue;
  
  import java.util.Properties;
  import java.util.stream.Collectors;
  
  /**
   * SQL statement visitor for mask DistSQL.
   */
  public final class MaskDistSQLStatementVisitor extends MaskDistSQLStatementBaseVisitor<ASTNode> implements SQLVisitor<ASTNode> {
      
      @Override
      public ASTNode visitCreateMaskRule(final CreateMaskRuleContext ctx) {
          return new CreateMaskRuleStatement(null != ctx.ifNotExists(), ctx.maskRuleDefinition().stream().map(each -> (MaskRuleSegment) visit(each)).collect(Collectors.toList()));
      }
      
      @Override
      public ASTNode visitAlterMaskRule(final AlterMaskRuleContext ctx) {
          return new AlterMaskRuleStatement(ctx.maskRuleDefinition().stream().map(each -> (MaskRuleSegment) visit(each)).collect(Collectors.toList()));
      }
      
      @Override
      public ASTNode visitDropMaskRule(final DropMaskRuleContext ctx) {
          return new DropMaskRuleStatement(null != ctx.ifExists(), ctx.ruleName().stream().map(this::getIdentifierValue).collect(Collectors.toList()));
      }
      
      @Override
      public ASTNode visitShowMaskRules(final ShowMaskRulesContext ctx) {
          return new ShowMaskRulesStatement(null == ctx.RULE() ? null : getIdentifierValue(ctx.ruleName()),
                  null == ctx.databaseName() ? null : new FromDatabaseSegment(ctx.FROM().getSymbol().getStartIndex(), (DatabaseSegment) visit(ctx.databaseName())));
      }
      
      @Override
      public ASTNode visitCountMaskRule(final CountMaskRuleContext ctx) {
          return new CountRuleStatement(null == ctx.databaseName() ? null : new FromDatabaseSegment(ctx.FROM().getSymbol().getStartIndex(), (DatabaseSegment) visit(ctx.databaseName())), "MASK");
      }
      
      @Override
      public ASTNode visitMaskRuleDefinition(final MaskRuleDefinitionContext ctx) {
          return new MaskRuleSegment(getIdentifierValue(ctx.ruleName()), ctx.columnDefinition().stream().map(each -> (MaskColumnSegment) visit(each)).collect(Collectors.toList()));
      }
      
      @Override
      public ASTNode visitColumnDefinition(final ColumnDefinitionContext ctx) {
          return new MaskColumnSegment(getIdentifierValue(ctx.columnName()), (AlgorithmSegment) visit(ctx.algorithmDefinition()));
      }
      
      @Override
      public ASTNode visitAlgorithmDefinition(final AlgorithmDefinitionContext ctx) {
          return new AlgorithmSegment(getIdentifierValue(ctx.algorithmTypeName()), getProperties(ctx.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(QuoteCharacter.unwrapAndTrimText(each.key.getText()), QuoteCharacter.unwrapAndTrimText(each.value.getText()));
         }
         return result;
     }
     
     @Override
     public ASTNode visitDatabaseName(final DatabaseNameContext ctx) {
         return new DatabaseSegment(ctx.getStart().getStartIndex(), ctx.getStop().getStopIndex(), new IdentifierValue(ctx.getText()));
     }
     
     @Override
     public ASTNode visitShowMaskAlgorithmPlugins(final ShowMaskAlgorithmPluginsContext ctx) {
         return new ShowPluginsStatement("MASK_ALGORITHM");
     }
 }