/*
    * 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.core.importer.sink;
  
  import io.netty.channel.Channel;
  import lombok.Getter;
  import lombok.SneakyThrows;
  import org.apache.shardingsphere.data.pipeline.cdc.generator.CDCResponseUtils;
  import org.apache.shardingsphere.data.pipeline.cdc.protocol.response.CDCResponse.ResponseCase;
  import org.apache.shardingsphere.data.pipeline.cdc.protocol.response.DataRecordResult;
  import org.apache.shardingsphere.data.pipeline.cdc.util.DataRecordResultConvertUtils;
  import org.apache.shardingsphere.data.pipeline.core.importer.sink.PipelineSink;
  import org.apache.shardingsphere.data.pipeline.core.ingest.record.DataRecord;
  import org.apache.shardingsphere.data.pipeline.core.ingest.record.Record;
  import org.apache.shardingsphere.data.pipeline.core.job.progress.listener.PipelineJobProgressUpdatedParameter;
  import org.apache.shardingsphere.infra.exception.core.external.sql.sqlstate.XOpenSQLState;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.LinkedList;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.locks.Condition;
  import java.util.concurrent.locks.Lock;
  import java.util.concurrent.locks.ReentrantLock;
  
  /**
   * Pipeline CDC socket sink.
   */
  public final class PipelineCDCSocketSink implements PipelineSink {
      
      private static final long DEFAULT_TIMEOUT_MILLISECONDS = 100L;
      
      private final Lock lock = new ReentrantLock();
      
      private final Condition condition = lock.newCondition();
      
      @Getter
      private final Channel channel;
      
      private final ShardingSphereDatabase database;
      
      private final Map<String, String> tableSchemaNameMap;
      
      public PipelineCDCSocketSink(final Channel channel, final ShardingSphereDatabase database, final Collection<String> schemaTableNames) {
          this.channel = channel;
          this.database = database;
          tableSchemaNameMap = new HashMap<>(schemaTableNames.size(), 1F);
          schemaTableNames.stream().filter(each -> each.contains(".")).forEach(each -> {
              String[] split = each.split("\\.");
              tableSchemaNameMap.put(split[1], split[0]);
          });
      }
      
      @Override
      public PipelineJobProgressUpdatedParameter write(final String ackId, final Collection<Record> records) {
          if (records.isEmpty()) {
              return new PipelineJobProgressUpdatedParameter(0);
          }
          while (!channel.isWritable() && channel.isActive()) {
              doAwait();
          }
          if (!channel.isActive()) {
              return new PipelineJobProgressUpdatedParameter(0);
          }
          Collection<DataRecordResult.Record> resultRecords = getResultRecords(records);
          DataRecordResult dataRecordResult = DataRecordResult.newBuilder().addAllRecord(resultRecords).setAckId(ackId).build();
          channel.writeAndFlush(CDCResponseUtils.succeed("", ResponseCase.DATA_RECORD_RESULT, dataRecordResult));
          return new PipelineJobProgressUpdatedParameter(resultRecords.size());
      }
      
      @SneakyThrows(InterruptedException.class)
      private void doAwait() {
          lock.lock();
          long startMillis = System.currentTimeMillis();
          long endMillis = startMillis;
          boolean awaitResult;
          try {
              do {
                  awaitResult = condition.await(DEFAULT_TIMEOUT_MILLISECONDS - (endMillis - startMillis), TimeUnit.MILLISECONDS);
                  endMillis = System.currentTimeMillis();
              } while (!awaitResult && DEFAULT_TIMEOUT_MILLISECONDS > endMillis - startMillis);
         } finally {
             lock.unlock();
         }
     }
     
     private Collection<DataRecordResult.Record> getResultRecords(final Collection<Record> records) {
         Collection<DataRecordResult.Record> result = new LinkedList<>();
         for (Record each : records) {
             if (each instanceof DataRecord) {
                 DataRecord dataRecord = (DataRecord) each;
                 result.add(DataRecordResultConvertUtils.convertDataRecordToRecord(database.getName(), tableSchemaNameMap.get(dataRecord.getTableName()), dataRecord));
             }
         }
         return result;
     }
     
     @Override
     public void close() throws IOException {
         channel.writeAndFlush(CDCResponseUtils.failed("", XOpenSQLState.GENERAL_ERROR.getValue(), "The socket channel is closed."));
     }
 }