/**
 * 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.crunch.scrunch

import com.google.common.collect.ImmutableList
import org.apache.crunch.io.{From => from, To => to}
import org.apache.crunch.test.Person
import _root_.org.junit.Test

case class Foo(val bar: Int, val baz: String)

class JoinTest extends CrunchSuite {
  lazy val pipeline = Pipeline.mapReduce[JoinTest](tempDir.getDefaultConfiguration)

  def wordCount(fileName: String) = {
    pipeline.read(from.textFile(fileName))
        .flatMap(_.toLowerCase.split("\\W+")).count
  }

  @Test def join {
    val shakespeare = tempDir.copyResourceFileName("shakes.txt")
    val dickens = tempDir.copyResourceFileName("dickens.txt")
    val output = tempDir.getFile("output")
    val filtered = wordCount(shakespeare).join(wordCount(dickens))
        .map((k, v) => (k, v._1 - v._2))
        .write(to.textFile(output.getAbsolutePath()))
        .filter((k, d) => d > 0).materialize
    assert(filtered.exists(_ == ("noble", 9)))
    pipeline.done
  }

  @Test def joinMapside {
    val shakespeare = tempDir.copyResourceFileName("shakes.txt")
    val dickens = tempDir.copyResourceFileName("dickens.txt")
    val output = tempDir.getFile("output")
    val filtered = wordCount(shakespeare).innerJoinUsing(wordCount(dickens), Joins.mapside())
      .map((k, v) => (k, v._1 - v._2))
      .write(to.textFile(output.getAbsolutePath()))
      .filter((k, d) => d > 0).materialize
    assert(filtered.exists(_ == ("noble", 9)))
    pipeline.done
  }

  @Test def joinCaseWithSpecific: Unit = {
    val foos = pipeline.create(List(Foo(1, "a"), Foo(2, "b")), Avros.caseClasses[Foo])
    val p1 = new Person()
    p1.setName("Josh")
    p1.setAge(35)
    p1.setSiblingnames(ImmutableList.of("Kate", "Mike"))
    val people = pipeline.create(List(p1), Avros.specifics[Person])

    val res = foos.by(_ => "key").join(people.by(_ => "key"))
    println(res.materialize())
    pipeline.done()
  }
}
