/*
 * Copyright 2016, Yahoo! Inc.
 * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
 */
package com.yahoo.sketches.pig.tuple;

import org.apache.pig.Accumulator;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.testng.Assert;
import org.testng.annotations.Test;

import com.yahoo.memory.Memory;
import com.yahoo.sketches.tuple.ArrayOfDoublesSketch;
import com.yahoo.sketches.tuple.ArrayOfDoublesSketches;
import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketch;
import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketchBuilder;

public class DataToArrayOfDoublesSketchTest {

  @Test
  public void execNullInputTuple() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch();
    Tuple resultTuple = func.exec(null);
    Assert.assertNull(resultTuple);
  }

  @Test
  public void execEmptyInputTuple() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch();
    Tuple resultTuple = func.exec(TupleFactory.getInstance().newTuple());
    Assert.assertNull(resultTuple);
  }

  @Test
  public void execEmptyBag() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch("1");
    Tuple inputTuple = PigUtil.objectsToTuple(BagFactory.getInstance().newDefaultBag());
    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), 0.0);
  }

  @Test(expectedExceptions = IllegalArgumentException.class)
  public void execWrongSizeOfInnerTuple() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch("32", "1");
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple(1));
    Tuple inputTuple = PigUtil.objectsToTuple(bag);
    func.exec(inputTuple);
  }

  @Test(expectedExceptions = IllegalArgumentException.class)
  public void execWrongKeyType() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch("32", "1");
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple(new Object(), 1.0)); // Object in place of key is not supported
    Tuple inputTuple = PigUtil.objectsToTuple(bag);
    func.exec(inputTuple);
  }

  @Test
  public void execAllInputTypes() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch("32", "1");
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple("a", 1.0));
    bag.add(PigUtil.objectsToTuple("b", 1.0));
    bag.add(PigUtil.objectsToTuple("a", 2.0));
    bag.add(PigUtil.objectsToTuple("b", 2.0));

    bag.add(PigUtil.objectsToTuple(1, 3.0));
    bag.add(PigUtil.objectsToTuple(2L, 3.0));
    bag.add(PigUtil.objectsToTuple(1f, 3.0));
    bag.add(PigUtil.objectsToTuple(2.0, 3.0));
    bag.add(PigUtil.objectsToTuple((byte) 3, 3.0));
    bag.add(PigUtil.objectsToTuple(new DataByteArray("c".getBytes()), 3.0));

    Tuple inputTuple = PigUtil.objectsToTuple(bag);
    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), 8.0, 0.0);

    for (double[] values: sketch.getValues()) {
      Assert.assertEquals(values[0], 3.0);
    }
  }

  @Test
  public void execWithSampling() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch("1024", "0.5", "1");
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    int uniques = 10000;
    for (int i = 0; i < uniques; i++) bag.add(PigUtil.objectsToTuple(i, 1.0));
    Tuple resultTuple = func.exec(PigUtil.objectsToTuple(bag));
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), uniques, uniques * 0.01);
  }

  @Test
  public void accumulator() throws Exception {
    Accumulator<Tuple> func = new DataToArrayOfDoublesSketch("32", "1");

    Tuple inputTuple = TupleFactory.getInstance().newTuple(1);
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple("a", 1.0));
    inputTuple.set(0, bag);

    func.accumulate(inputTuple);

    inputTuple = TupleFactory.getInstance().newTuple(1);
    bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple("b", 1.0));
    bag.add(PigUtil.objectsToTuple("a", 2.0));
    bag.add(PigUtil.objectsToTuple("b", 2.0));
    inputTuple.set(0, bag);

    func.accumulate(inputTuple);

    Tuple resultTuple = func.getValue();
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), 2.0, 0.0);

    for (double[] values: sketch.getValues()) {
      Assert.assertEquals(values[0], 3.0);
    }

    // after cleanup, the value should always be 0
    func.cleanup();
    resultTuple = func.getValue();
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch2 = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch2.getEstimate(), 0.0, 0.0);
  }

  @Test
  public void algebraicInitial() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch.Initial(null);
    Tuple inputTuple = TupleFactory.getInstance().newTuple(1);
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(PigUtil.objectsToTuple(null, null));
    bag.add(PigUtil.objectsToTuple(null, null));
    bag.add(PigUtil.objectsToTuple(null, null));
    inputTuple.set(0, bag);

    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataBag resultBag = (DataBag) resultTuple.get(0);
    Assert.assertEquals(resultBag.size(), 3);
  }

  @Test
  public void algebraicIntermediateFinal() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch.IntermediateFinal("1");
    Tuple inputTuple = TupleFactory.getInstance().newTuple(1);
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    inputTuple.set(0, bag);

    // this is to simulate the output from Initial
    bag.add(PigUtil.objectsToTuple(PigUtil.tuplesToBag(PigUtil.objectsToTuple("a", 1.0))));

    // this is to simulate the output from a prior call of IntermediateFinal
    {
      ArrayOfDoublesUpdatableSketch sketch = new ArrayOfDoublesUpdatableSketchBuilder().build();
      sketch.update("b", new double[] {1.0});
      sketch.update("a", new double[] {2.0});
      sketch.update("b", new double[] {2.0});
      bag.add(PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray())));
    }

    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), 2.0, 0.0);

    for (double[] values: sketch.getValues()) {
      Assert.assertEquals(values[0], 3.0);
    }
  }

  @Test
  public void algebraicIntermediateFinalWithSampling() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch.IntermediateFinal("1024", "0.5", "1");

    DataBag bag = BagFactory.getInstance().newDefaultBag();
    int uniques = 10000;
    for (int i = 0; i < uniques; i++) bag.add(PigUtil.objectsToTuple(i, 1.0));

    Tuple resultTuple = func.exec(PigUtil.objectsToTuple(PigUtil.tuplesToBag(PigUtil.objectsToTuple(bag))));
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 1);
    DataByteArray bytes = (DataByteArray) resultTuple.get(0);
    Assert.assertTrue(bytes.size() > 0);
    ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.heapifySketch(Memory.wrap(bytes.get()));
    Assert.assertEquals(sketch.getEstimate(), uniques, uniques * 0.01);
  }

  @Test(expectedExceptions = IllegalArgumentException.class)
  public void algebraicIntermediateFinalNullBag() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch.IntermediateFinal("32", "1");
    func.exec(TupleFactory.getInstance().newTuple(1));
  }

  @Test(expectedExceptions = IllegalArgumentException.class)
  public void algebraicIntermediateFinalWrongType() throws Exception {
    EvalFunc<Tuple> func = new DataToArrayOfDoublesSketch.IntermediateFinal("32", "1");
    DataBag bag = BagFactory.getInstance().newDefaultBag();
    bag.add(TupleFactory.getInstance().newTuple(1.0));
    func.exec(TupleFactory.getInstance().newTuple(bag));
  }
}