/*
    * 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.encrypt.rewrite.condition.impl;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  import org.apache.shardingsphere.encrypt.rewrite.condition.EncryptCondition;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.FunctionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.LiteralExpressionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.ParameterMarkerExpressionSegment;
  
  import java.util.ArrayList;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  /**
   * Encrypt condition for equal.
   */
  @Getter
  @EqualsAndHashCode
  @ToString
  public final class EncryptBinaryCondition implements EncryptCondition {
      
      private final String columnName;
      
      private final String tableName;
      
      private final String operator;
      
      private final int startIndex;
      
      private final int stopIndex;
      
      private final ExpressionSegment expressionSegment;
      
      private final Map<Integer, Integer> positionIndexMap = new LinkedHashMap<>();
      
      private final Map<Integer, Object> positionValueMap = new LinkedHashMap<>();
      
      public EncryptBinaryCondition(final String columnName, final String tableName, final String operator, final int startIndex, final int stopIndex, final ExpressionSegment expressionSegment) {
          this.columnName = columnName;
          this.tableName = tableName;
          this.operator = operator;
          this.startIndex = startIndex;
          this.stopIndex = stopIndex;
          this.expressionSegment = expressionSegment;
          putPositionMap(0, expressionSegment);
      }
      
      private void putPositionMap(final int index, final ExpressionSegment expressionSegment) {
          if (expressionSegment instanceof ParameterMarkerExpressionSegment) {
              positionIndexMap.put(index, ((ParameterMarkerExpressionSegment) expressionSegment).getParameterMarkerIndex());
          } else if (expressionSegment instanceof LiteralExpressionSegment) {
              positionValueMap.put(index, ((LiteralExpressionSegment) expressionSegment).getLiterals());
          } else if (expressionSegment instanceof FunctionSegment && "CONCAT".equalsIgnoreCase(((FunctionSegment) expressionSegment).getFunctionName())) {
              int parameterIndex = index;
              for (ExpressionSegment each : ((FunctionSegment) expressionSegment).getParameters()) {
                  putPositionMap(parameterIndex++, each);
              }
          }
      }
      
      @Override
      public List<Object> getValues(final List<Object> params) {
          List<Object> result = new ArrayList<>(positionValueMap.values());
          for (Entry<Integer, Integer> entry : positionIndexMap.entrySet()) {
              Object param = params.get(entry.getValue());
              if (entry.getKey() < result.size()) {
                  result.add(entry.getKey(), param);
              } else {
                  result.add(param);
              }
          }
          return result;
      }
  }