/*
 * 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.comet.shims

import org.apache.spark.sql.catalyst.expressions.EvalMode
import org.apache.spark.sql.catalyst.expressions.aggregate.Sum
import org.apache.spark.sql.internal.SQLConf

import org.apache.comet.expressions.CometEvalMode
import org.apache.comet.serde.ExprOuterClass.BinaryOutputStyle

/**
 * `CometExprShim` acts as a shim for parsing expressions from different Spark versions.
 */
trait CometExprShim extends Spark4xCometExprShim {

  def binaryOutputStyle: BinaryOutputStyle = {
    SQLConf.get
      .getConf(SQLConf.BINARY_OUTPUT_STYLE)
      .map(SQLConf.BinaryOutputStyle.withName) match {
      case Some(SQLConf.BinaryOutputStyle.UTF8) => BinaryOutputStyle.UTF8
      case Some(SQLConf.BinaryOutputStyle.BASIC) => BinaryOutputStyle.BASIC
      case Some(SQLConf.BinaryOutputStyle.BASE64) => BinaryOutputStyle.BASE64
      case Some(SQLConf.BinaryOutputStyle.HEX) => BinaryOutputStyle.HEX
      case _ => BinaryOutputStyle.HEX_DISCRETE
    }
  }
}

object CometEvalModeUtil {
  def fromSparkEvalMode(evalMode: EvalMode.Value): CometEvalMode.Value = evalMode match {
    case EvalMode.LEGACY => CometEvalMode.LEGACY
    case EvalMode.TRY => CometEvalMode.TRY
    case EvalMode.ANSI => CometEvalMode.ANSI
  }

  def sumEvalMode(s: Sum): EvalMode.Value = s.evalMode
}
