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// scalastyle:off
/*
 * This file is copied from:
 * https://github.com/ssavvides/tpch-spark/blob/master/src/main/scala/Q09.scala
 *
 * Copyright (c) 2015 Savvas Savvides, [email protected], [email protected]
 *
 * Licensed under the The MIT License:
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
// scalastyle:on

package com.intel.analytics.bigdl.ppml.examples.tpch

import org.apache.spark.sql.DataFrame
import org.apache.spark.SparkContext
import org.apache.spark.sql.functions.sum
import org.apache.spark.sql.functions.udf

import com.intel.analytics.bigdl.ppml.PPMLContext

/**
 * TPC-H Query 9
 * Savvas Savvides 
 *
 */
class Q09 extends TpchQuery {

  override def execute(sc: PPMLContext, schemaProvider: TpchSchemaProvider): DataFrame = {

    // this is used to implicitly convert an RDD to a DataFrame.
    val sqlContext = sc.getSparkSession.sqlContext
    import sqlContext.implicits._
    import schemaProvider._

    val getYear = udf { (x: String) => x.substring(0, 4) }
    val expr = udf { (x: Double, y: Double, v: Double, w: Double) => x * (1 - y) - (v * w) }

    val linePart = part.filter($"p_name".contains("green"))
      .join(lineitem, $"p_partkey" === lineitem("l_partkey"))

    val natSup = nation.join(supplier, $"n_nationkey" === supplier("s_nationkey"))

    linePart.join(natSup, $"l_suppkey" === natSup("s_suppkey"))
      .join(partsupp, $"l_suppkey" === partsupp("ps_suppkey")
        && $"l_partkey" === partsupp("ps_partkey"))
      .join(order, $"l_orderkey" === order("o_orderkey"))
      .select($"n_name", getYear($"o_orderdate").as("o_year"),
        expr($"l_extendedprice", $"l_discount", $"ps_supplycost", $"l_quantity").as("amount"))
      .groupBy($"n_name", $"o_year")
      .agg(sum($"amount"))
      .sort($"n_name", $"o_year".desc)

  }

}