/*
 * 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.kyuubi.engine.spark.operation

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.types.StructType

import org.apache.kyuubi.engine.spark.IterableFetchIterator
import org.apache.kyuubi.engine.spark.shim.SparkCatalogShim
import org.apache.kyuubi.operation.OperationType
import org.apache.kyuubi.operation.meta.ResultSetSchemaConstant._
import org.apache.kyuubi.session.Session

class GetTables(
    spark: SparkSession,
    session: Session,
    catalog: String,
    schema: String,
    tableName: String,
    tableTypes: Set[String])
  extends SparkOperation(spark, OperationType.GET_TABLES, session) {

  override def statement: String = {
    super.statement +
      s" [catalog: $catalog," +
      s" schemaPattern: $schema," +
      s" tablePattern: $tableName," +
      s" tableTypes: ${tableTypes.mkString("(", ", ", ")")}]"
  }

  override protected def resultSchema: StructType = {
    new StructType()
      .add(TABLE_CAT, "string", nullable = true, "Catalog name. NULL if not applicable.")
      .add(TABLE_SCHEM, "string", nullable = true, "Schema name.")
      .add(TABLE_NAME, "string", nullable = true, "Table name.")
      .add(TABLE_TYPE, "string", nullable = true, "The table type, e.g. \"TABLE\", \"VIEW\"")
      .add(REMARKS, "string", nullable = true, "Comments about the table.")
      .add("TYPE_CAT", "string", nullable = true, "The types catalog.")
      .add("TYPE_SCHEM", "string", nullable = true, "the types schema (may be null)")
      .add("TYPE_NAME", "string", nullable = true, "Type name.")
      .add("SELF_REFERENCING_COL_NAME", "string", nullable = true,
        "Name of the designated \"identifier\" column of a typed table.")
      .add("REF_GENERATION", "string", nullable = true,
        "Specifies how values in SELF_REFERENCING_COL_NAME are created.")
  }

  override protected def runInternal(): Unit = {
    try {
      val schemaPattern = toJavaRegex(schema)
      val tablePattern = toJavaRegex(tableName)
      val sparkShim = SparkCatalogShim()
      val catalogTablesAndViews =
        sparkShim.getCatalogTablesOrViews(spark, catalog, schemaPattern, tablePattern, tableTypes)

      val allTableAndViews =
        if (tableTypes.exists("VIEW".equalsIgnoreCase)) {
          catalogTablesAndViews ++
            sparkShim.getTempViews(spark, catalog, schemaPattern, tablePattern)
        } else {
          catalogTablesAndViews
        }
      iter = new IterableFetchIterator(allTableAndViews)
    } catch {
      onError()
    }
  }
}
