/*
    * 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.data.pipeline.cdc.distsql.parser.core;
  
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.apache.shardingsphere.data.pipeline.cdc.distsql.statement.queryable.ShowStreamingListStatement;
  import org.apache.shardingsphere.data.pipeline.cdc.distsql.statement.queryable.ShowStreamingRuleStatement;
  import org.apache.shardingsphere.data.pipeline.cdc.distsql.statement.queryable.ShowStreamingStatusStatement;
  import org.apache.shardingsphere.data.pipeline.cdc.distsql.statement.updatable.DropStreamingStatement;
  import org.apache.shardingsphere.data.pipeline.distsql.statement.updatable.AlterTransmissionRuleStatement;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementBaseVisitor;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.AlgorithmDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.AlterStreamingRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.BatchSizeContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.DropStreamingContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.PropertiesDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.PropertyContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.RateLimiterContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.ReadDefinitionContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.ShardingSizeContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.ShowStreamingListContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.ShowStreamingRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.ShowStreamingStatusContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.StreamChannelContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.TransmissionRuleContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.WorkerThreadContext;
  import org.apache.shardingsphere.distsql.parser.autogen.CDCDistSQLStatementParser.WriteDefinitionContext;
  import org.apache.shardingsphere.distsql.segment.AlgorithmSegment;
  import org.apache.shardingsphere.distsql.segment.ReadOrWriteSegment;
  import org.apache.shardingsphere.distsql.segment.TransmissionRuleSegment;
  import org.apache.shardingsphere.infra.database.core.metadata.database.enums.QuoteCharacter;
  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.value.identifier.IdentifierValue;
  
  import java.util.Properties;
  
  /**
   * SQL statement visitor for CDC DistSQL.
   */
  public final class CDCDistSQLStatementVisitor extends CDCDistSQLStatementBaseVisitor<ASTNode> implements SQLVisitor<ASTNode> {
      
      @Override
      public ASTNode visitShowStreamingList(final ShowStreamingListContext ctx) {
          return new ShowStreamingListStatement();
      }
      
      @Override
      public ASTNode visitShowStreamingStatus(final ShowStreamingStatusContext ctx) {
          return new ShowStreamingStatusStatement(getIdentifierValue(ctx.jobId()));
      }
      
      @Override
      public ASTNode visitDropStreaming(final DropStreamingContext ctx) {
          return new DropStreamingStatement(getIdentifierValue(ctx.jobId()));
      }
      
      private String getIdentifierValue(final ParseTree ctx) {
          return null == ctx ? null : new IdentifierValue(ctx.getText()).getValue();
      }
      
      @Override
      public ASTNode visitShowStreamingRule(final ShowStreamingRuleContext ctx) {
          return new ShowStreamingRuleStatement();
      }
      
      @Override
      public ASTNode visitAlterStreamingRule(final AlterStreamingRuleContext ctx) {
          return new AlterTransmissionRuleStatement("STREAMING", (TransmissionRuleSegment) visit(ctx.transmissionRule()));
      }
      
      @Override
      public ASTNode visitTransmissionRule(final TransmissionRuleContext ctx) {
          TransmissionRuleSegment result = new TransmissionRuleSegment();
          if (null != ctx.readDefinition()) {
              result.setReadSegment((ReadOrWriteSegment) visit(ctx.readDefinition()));
          }
          if (null != ctx.writeDefinition()) {
              result.setWriteSegment((ReadOrWriteSegment) visit(ctx.writeDefinition()));
          }
          if (null != ctx.streamChannel()) {
              result.setStreamChannel((AlgorithmSegment) visit(ctx.streamChannel()));
          }
          return result;
     }
     
     @Override
     public ASTNode visitReadDefinition(final ReadDefinitionContext ctx) {
         return new ReadOrWriteSegment(getWorkerThread(ctx.workerThread()), getBatchSize(ctx.batchSize()), getShardingSize(ctx.shardingSize()), getAlgorithmSegment(ctx.rateLimiter()));
     }
     
     private Integer getWorkerThread(final WorkerThreadContext ctx) {
         return null == ctx ? null : Integer.parseInt(ctx.intValue().getText());
     }
     
     private Integer getBatchSize(final BatchSizeContext ctx) {
         return null == ctx ? null : Integer.parseInt(ctx.intValue().getText());
     }
     
     private Integer getShardingSize(final ShardingSizeContext ctx) {
         return null == ctx ? null : Integer.parseInt(ctx.intValue().getText());
     }
     
     private AlgorithmSegment getAlgorithmSegment(final RateLimiterContext ctx) {
         return null == ctx ? null : (AlgorithmSegment) visit(ctx);
     }
     
     @Override
     public ASTNode visitWriteDefinition(final WriteDefinitionContext ctx) {
         return new ReadOrWriteSegment(getWorkerThread(ctx.workerThread()), getBatchSize(ctx.batchSize()), getAlgorithmSegment(ctx.rateLimiter()));
     }
     
     @Override
     public ASTNode visitRateLimiter(final RateLimiterContext ctx) {
         return visit(ctx.algorithmDefinition());
     }
     
     @Override
     public ASTNode visitStreamChannel(final StreamChannelContext ctx) {
         return visit(ctx.algorithmDefinition());
     }
     
     @Override
     public ASTNode visitAlgorithmDefinition(final AlgorithmDefinitionContext ctx) {
         return new AlgorithmSegment(getIdentifierValue(ctx.algorithmTypeName()), buildProperties(ctx.propertiesDefinition()));
     }
     
     private Properties buildProperties(final PropertiesDefinitionContext ctx) {
         Properties result = new Properties();
         if (null == ctx) {
             return result;
         }
         for (PropertyContext each : ctx.properties().property()) {
             result.setProperty(QuoteCharacter.unwrapAndTrimText(each.key.getText()), QuoteCharacter.unwrapAndTrimText(each.value.getText()));
         }
         return result;
     }
 }