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/*
 * 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.paimon.spark.execution

import org.apache.paimon.spark.catalyst.plans.logical.PaimonCallCommand

import org.apache.spark.sql.{SparkSession, Strategy}
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.{Expression, GenericInternalRow, PredicateHelper}
import org.apache.spark.sql.catalyst.plans.logical.{CreateTableAsSelect, LogicalPlan}
import org.apache.spark.sql.execution.SparkPlan
import org.apache.spark.sql.execution.shim.PaimonCreateTableAsSelectStrategy

case class PaimonStrategy(spark: SparkSession) extends Strategy with PredicateHelper {

  override def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {

    case ctas: CreateTableAsSelect =>
      PaimonCreateTableAsSelectStrategy(spark)(ctas)

    case c @ PaimonCallCommand(procedure, args) =>
      val input = buildInternalRow(args)
      PaimonCallExec(c.output, procedure, input) :: Nil
    case _ => Nil
  }

  private def buildInternalRow(exprs: Seq[Expression]): InternalRow = {
    val values = new Array[Any](exprs.size)
    for (index <- exprs.indices) {
      values(index) = exprs(index).eval()
    }
    new GenericInternalRow(values)
  }

}