/*
 * 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.catalyst.analysis

import org.apache.paimon.spark.SparkTable

import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.analysis.{EliminateSubqueryAliases, ResolvedTable}
import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, Project}
import org.apache.spark.sql.execution.datasources.v2.DataSourceV2Relation

import scala.util.control.NonFatal

/** An analysis helper */
object PaimonRelation extends Logging {

  def unapply(plan: LogicalPlan): Option[SparkTable] =
    EliminateSubqueryAliases(plan) match {
      case Project(_, DataSourceV2Relation(table: SparkTable, _, _, _, _)) => Some(table)
      case DataSourceV2Relation(table: SparkTable, _, _, _, _) => Some(table)
      case ResolvedTable(_, _, table: SparkTable, _) => Some(table)
      case _ => None
    }

  def isPaimonTable(plan: LogicalPlan): Boolean = {
    try {
      PaimonRelation.unapply(plan).nonEmpty
    } catch {
      case NonFatal(e) =>
        logWarning("Can't check if this plan is a paimon table", e)
        false
    }
  }

  def getPaimonRelation(plan: LogicalPlan): DataSourceV2Relation = {
    EliminateSubqueryAliases(plan) match {
      case Project(_, d @ DataSourceV2Relation(_: SparkTable, _, _, _, _)) => d
      case d @ DataSourceV2Relation(_: SparkTable, _, _, _, _) => d
      case _ => throw new RuntimeException(s"It's not a paimon table, $plan")
    }
  }
}
