/*
 * 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.spark.sql.execution.shim

import org.apache.paimon.Snapshot
import org.apache.paimon.spark.SparkCatalog
import org.apache.paimon.spark.catalog.FormatTableCatalog
import org.apache.paimon.spark.write.PaimonWriteOptions

import org.apache.spark.sql.{SparkSession, Strategy}
import org.apache.spark.sql.catalyst.analysis.ResolvedIdentifier
import org.apache.spark.sql.catalyst.plans.logical.{CreateTableAsSelect, LogicalPlan, TableSpec}
import org.apache.spark.sql.execution.{PaimonTableAsSelectHelper, SparkPlan}
import org.apache.spark.sql.execution.PaimonTableAsSelectHelper._
import org.apache.spark.sql.execution.datasources.v2.CreateTableAsSelectExec
import org.apache.spark.sql.util.CaseInsensitiveStringMap

import scala.collection.JavaConverters._

case class PaimonCreateTableAsSelectStrategy(spark: SparkSession)
  extends Strategy
  with PaimonTableAsSelectHelper {

  import org.apache.spark.sql.connector.catalog.CatalogV2Implicits._

  override def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
    case CreateTableAsSelect(
          ResolvedIdentifier(catalog: SparkCatalog, ident),
          parts,
          query,
          tableSpec: TableSpec,
          options,
          ifNotExists,
          analyzedQuery) =>
      assert(analyzedQuery.isDefined)
      val (tableOptions, writeOptions) =
        splitTableAndWriteOptions(options)
      val qualifiedSpec = qualifyTableSpec(tableSpec, tableOptions)

      val isPartitionedFormatTable = {
        catalog match {
          case formatCatalog: FormatTableCatalog =>
            formatCatalog.isFormatTable(qualifiedSpec.provider.orNull) && parts.nonEmpty
          case _ => false
        }
      }

      if (isPartitionedFormatTable) {
        throw new UnsupportedOperationException(
          "Using CTAS with partitioned format table is not supported yet.")
      }

      CreateTableAsSelectExec(
        catalog.asTableCatalog,
        ident,
        parts,
        analyzedQuery.get,
        planLater(query),
        qualifiedSpec,
        new CaseInsensitiveStringMap(
          (writeOptions +
            (PaimonWriteOptions.OPERATION_OPTION -> Snapshot.Operation.CREATE_TABLE_AS_SELECT
              .name())).asJava),
        ifNotExists
      ) :: Nil
    case _ => Nil
  }
}
