/*
 * 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.sql

import org.apache.paimon.spark.PaimonSparkTestBase

import org.apache.spark.sql.Row
import org.apache.spark.sql.execution.SortExec
import org.apache.spark.sql.execution.adaptive.AdaptiveSparkPlanHelper
import org.apache.spark.sql.execution.exchange.ShuffleExchangeLike

class BucketedTableQueryTest extends PaimonSparkTestBase with AdaptiveSparkPlanHelper {
  private def checkAnswerAndShuffleSorts(query: String, numShuffles: Int, numSorts: Int): Unit = {
    var expectedResult: Array[Row] = null
    // avoid config default value change in future, so specify it manually
    withSparkSQLConf(
      "spark.sql.sources.v2.bucketing.enabled" -> "false",
      "spark.sql.autoBroadcastJoinThreshold" -> "-1") {
      expectedResult = spark.sql(query).collect()
    }
    withSparkSQLConf(
      "spark.sql.sources.v2.bucketing.enabled" -> "true",
      "spark.sql.requireAllClusterKeysForCoPartition" -> "false",
      "spark.sql.autoBroadcastJoinThreshold" -> "-1"
    ) {
      val df = spark.sql(query)
      checkAnswer(df, expectedResult.toSeq)
      assert(collect(df.queryExecution.executedPlan) {
        case shuffle: ShuffleExchangeLike => shuffle
      }.size == numShuffles)
      if (gteqSpark3_4) {
        assert(collect(df.queryExecution.executedPlan) {
          case sort: SortExec => sort
        }.size == numSorts)
      }
    }
  }

  test("Query on a rescaled bucket table") {
    assume(gteqSpark3_3)

    withTable("t1", "t2") {

      spark.sql(
        "CREATE TABLE t1 (id INT, c STRING, dt STRING) partitioned by (dt) TBLPROPERTIES ('bucket'='2', 'bucket-key' = 'id')")
      spark.sql(
        "CREATE TABLE t2 (id INT, c STRING, dt STRING) partitioned by (dt) TBLPROPERTIES ('bucket'='3', 'bucket-key' = 'id')")
      spark.sql("INSERT INTO t1 VALUES (1, 'x1', '20250101'), (3, 'x2', '20250101')")
      spark.sql("INSERT INTO t2 VALUES (1, 'x1', '20250101'), (4, 'x2', '20250101')")
      checkAnswerAndShuffleSorts(
        "SELECT * FROM t1 JOIN t2 on t1.id = t2.id and t1.dt = '20250101' and t2.dt = '20250101'",
        2,
        2)
      spark.sql("ALTER TABLE t1 SET TBLPROPERTIES ('bucket' = '3')")
      checkAnswerAndShuffleSorts(
        "SELECT * FROM t1 JOIN t2 on t1.id = t2.id and t1.dt = t2.dt ",
        2,
        2)
    }

    withTable("t1", "t2") {

      spark.sql(
        "CREATE TABLE t1 (id INT, c STRING, dt STRING) partitioned by (dt) TBLPROPERTIES ('bucket'='2', 'bucket-key' = 'id')")
      spark.sql(
        "CREATE TABLE t2 (id INT, c STRING, dt STRING) partitioned by (dt) TBLPROPERTIES ('bucket'='2', 'bucket-key' = 'id')")
      // TODO if the input partition is not aligned by bucket value, the bucket join will not be applied.
      spark.sql("INSERT INTO t1 VALUES (1, 'x1', '20250101'), (2, 'x2', '20250101')")
      spark.sql("INSERT INTO t2 VALUES (1, 'x1', '20250101'), (5, 'x2', '20250101')")
      checkAnswerAndShuffleSorts(
        "SELECT * FROM t1 JOIN t2 on t1.id = t2.id and t1.dt = '20250101' and t2.dt = '20250101'",
        0,
        2)
      spark.sql("ALTER TABLE t1 SET TBLPROPERTIES ('bucket' = '3')")
      checkAnswerAndShuffleSorts(
        "SELECT * FROM t1 JOIN t2 on t1.id = t2.id and t1.dt = t2.dt ",
        0,
        2)
    }
  }

  test("Query on a bucketed table - join - positive case") {
    assume(gteqSpark3_3)

    withTable("t1", "t2", "t3", "t4", "t5", "t6") {
      spark.sql(
        "CREATE TABLE t1 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t1 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")

      // all matched
      spark.sql(
        "CREATE TABLE t2 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t2 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t2 on t1.id = t2.id", 0, 0)

      // different primary-key name but does not matter
      spark.sql(
        "CREATE TABLE t3 (id2 INT, c STRING) TBLPROPERTIES ('primary-key' = 'id2', 'bucket'='10')")
      spark.sql("INSERT INTO t3 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t3 on t1.id = t3.id2", 0, 0)

      // one primary-key table and one bucketed table
      spark.sql(
        "CREATE TABLE t4 (id INT, c STRING) TBLPROPERTIES ('bucket-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t4 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t4 on t1.id = t4.id", 0, 1)

      // one primary-key table and
      // one primary-key table with two primary keys and one bucket column
      spark.sql(
        "CREATE TABLE t5 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id,c', 'bucket-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t5 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t5 on t1.id = t5.id", 0, 0)

      // one primary-key table and
      // one primary-key table with two primary keys and one primary key is the partition column
      spark.sql(
        "CREATE TABLE t6 (id INT, data STRING, year STRING) PARTITIONED BY (year) TBLPROPERTIES ('primary-key' = 'id,year', 'bucket'='10')")
      spark.sql(
        "INSERT INTO t6 VALUES (1, 'x1', '2020'), (2, 'x3', '2020'), (3, 'x3', '2021'), (4, 'x4', '2021'), (5, 'x5', '2021')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t6 on t1.id = t6.id", 0, 0)
    }
  }

  test("Query on a bucketed table - join - negative case") {
    assume(gteqSpark3_3)

    withTable("t1", "t2", "t3", "t4", "t5", "t6", "t7") {
      spark.sql(
        "CREATE TABLE t1 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t1 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")

      // dynamic bucket number
      spark.sql("CREATE TABLE t2 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id')")
      spark.sql("INSERT INTO t2 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t2 on t1.id = t2.id", 2, 2)

      // different bucket number
      spark.sql(
        "CREATE TABLE t3 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='2')")
      spark.sql("INSERT INTO t3 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t3 on t1.id = t3.id", 2, 2)

      // different primary-key data type
      spark.sql(
        "CREATE TABLE t4 (id STRING, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t4 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t4 on t1.id = t4.id", 2, 2)

      // different input partition number
      spark.sql(
        "CREATE TABLE t5 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t5 VALUES (1, 'x1')")
      if (gteqSpark4_0) {
        checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t5 on t1.id = t5.id", 0, 0)
      } else {
        checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t5 on t1.id = t5.id", 2, 2)
      }

      // one more bucket keys
      spark.sql(
        "CREATE TABLE t6 (id1 INT, id2 INT, c STRING) TBLPROPERTIES ('bucket-key' = 'id1,id2', 'bucket'='10')")
      spark.sql(
        "INSERT INTO t6 VALUES (1, 1, 'x1'), (2, 2, 'x3'), (3, 3, 'x3'), (4, 4, 'x4'), (5, 5, 'x5')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t6 on t1.id = t6.id1", 2, 2)

      // primary-key table with three primary keys and one primary key is the partition column
      spark.sql(
        "CREATE TABLE t7 (id1 INT, id2 STRING, year STRING) PARTITIONED BY (year) TBLPROPERTIES ('primary-key' = 'id1,id2,year', 'bucket'='10')")
      spark.sql(
        "INSERT INTO t7 VALUES (1, 'x1', '2020'), (2, 'x3', '2020'), (3, 'x3', '2021'), (4, 'x4', '2021'), (5, 'x5', '2021')")
      checkAnswerAndShuffleSorts("SELECT * FROM t1 JOIN t7 on t1.id = t7.id1", 2, 2)
    }
  }

  test("Query on a bucketed table - other operators") {
    assume(gteqSpark3_3)

    withTable("t1") {
      spark.sql(
        "CREATE TABLE t1 (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='10')")
      spark.sql("INSERT INTO t1 VALUES (1, 'x1'), (2, 'x3'), (3, 'x3'), (4, 'x4'), (5, 'x5')")

      checkAnswerAndShuffleSorts("SELECT id, count(*) FROM t1 GROUP BY id", 0, 0)
      checkAnswerAndShuffleSorts("SELECT id, max(c) FROM t1 GROUP BY id", 0, 0)
      checkAnswerAndShuffleSorts("SELECT c, count(*) FROM t1 GROUP BY c", 1, 0)
      checkAnswerAndShuffleSorts("SELECT c, max(c) FROM t1 GROUP BY c", 1, 2)
      checkAnswerAndShuffleSorts("select max(c) OVER (PARTITION BY id ORDER BY c) from t1", 0, 1)
      // TODO: it is a Spark issue for `WindowExec` which would required partition-by + and order-by
      //   without do distinct..
      checkAnswerAndShuffleSorts("select max(c) OVER (PARTITION BY id ORDER BY id) from t1", 0, 1)
      checkAnswerAndShuffleSorts("select sum(id) OVER (PARTITION BY c ORDER BY id) from t1", 1, 1)

      withSparkSQLConf("spark.sql.requireAllClusterKeysForDistribution" -> "false") {
        checkAnswerAndShuffleSorts("SELECT id, c, count(*) FROM t1 GROUP BY id, c", 0, 0)
      }
      withSparkSQLConf("spark.sql.requireAllClusterKeysForDistribution" -> "true") {
        checkAnswerAndShuffleSorts("SELECT id, c, count(*) FROM t1 GROUP BY id, c", 1, 0)
      }
    }
  }

  test("Report scan output ordering - rawConvertible") {
    assume(gteqSpark3_3)

    withTable("t") {
      spark.sql(
        "CREATE TABLE t (id INT, c STRING) TBLPROPERTIES ('primary-key' = 'id', 'bucket'='2', 'deletion-vectors.enabled'='true')")

      // one file case
      spark.sql(s"INSERT INTO t VALUES (1, 'x1'), (2, 'x3')")
      checkAnswerAndShuffleSorts("SELECT id, max(c) FROM t GROUP BY id", 0, 0)

      // generate some files
      (1.to(20)).foreach {
        i => spark.sql(s"INSERT INTO t VALUES ($i, 'x1'), ($i, 'x3'), ($i, 'x3')")
      }
      checkAnswerAndShuffleSorts("SELECT id, max(c) FROM t GROUP BY id", 0, 1)
    }
  }
}
