/*
 * 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.phoenix.expression;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.math.BigDecimal;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.phoenix.expression.function.CosFunction;
import org.apache.phoenix.expression.function.SinFunction;
import org.apache.phoenix.expression.function.TanFunction;
import org.apache.phoenix.query.BaseTest;
import org.apache.phoenix.schema.SortOrder;
import org.apache.phoenix.schema.types.PDecimal;
import org.apache.phoenix.schema.types.PDouble;
import org.apache.phoenix.schema.types.PFloat;
import org.apache.phoenix.schema.types.PInteger;
import org.apache.phoenix.schema.types.PLong;
import org.apache.phoenix.schema.types.PNumericType;
import org.apache.phoenix.schema.types.PSmallint;
import org.apache.phoenix.schema.types.PTinyint;
import org.apache.phoenix.schema.types.PUnsignedDouble;
import org.apache.phoenix.schema.types.PUnsignedFloat;
import org.apache.phoenix.schema.types.PUnsignedInt;
import org.apache.phoenix.schema.types.PUnsignedLong;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import org.apache.phoenix.thirdparty.com.google.common.collect.Lists;

/**
 * Unit tests for {@link SinFunction} Unit tests for {@link CosFunction} Unit tests for
 * {@link TanFunction}
 */

@RunWith(Parameterized.class)
public class MathTrigFunctionTest {

  private Number[] value;
  private PNumericType dataType;

  public MathTrigFunctionTest(Number[] value, PNumericType dataType) {
    this.value = value;
    this.dataType = dataType;
  }

  @Parameters(name = "{0} {1}")
  public static synchronized Collection<Object> data() {
    return Arrays.asList((Object[]) new Object[][] {
      { new BigDecimal[] { BigDecimal.valueOf(1.0), BigDecimal.valueOf(0.0),
        BigDecimal.valueOf(-1.0), BigDecimal.valueOf(123.1234), BigDecimal.valueOf(-123.1234) },
        PDecimal.INSTANCE },
      { new Float[] { 1.0f, 0.0f, -1.0f, Float.MAX_VALUE, Float.MIN_VALUE, -Float.MAX_VALUE,
        -Float.MIN_VALUE, 123.1234f, -123.1234f }, PFloat.INSTANCE },
      { new Float[] { 1.0f, 0.0f, Float.MAX_VALUE, Float.MIN_VALUE, 123.1234f },
        PUnsignedFloat.INSTANCE },
      { new Double[] { 1.0, 0.0, -1.0, Double.MAX_VALUE, Double.MIN_VALUE, -Double.MAX_VALUE,
        -Double.MIN_VALUE, 123.1234, -123.1234 }, PDouble.INSTANCE },
      { new Double[] { 1.0, 0.0, Double.MAX_VALUE, Double.MIN_VALUE, 123.1234 },
        PUnsignedDouble.INSTANCE },
      { new Long[] { (long) 1, (long) 0, (long) -1, Long.MAX_VALUE, Long.MIN_VALUE, (long) 123,
        (long) -123 }, PLong.INSTANCE },
      { new Long[] { (long) 1, (long) 0, Long.MAX_VALUE, (long) 123 }, PUnsignedLong.INSTANCE },
      { new Integer[] { 1, 0, -1, Integer.MAX_VALUE, Integer.MIN_VALUE, 123, -123 },
        PInteger.INSTANCE },
      { new Integer[] { 1, 0, Integer.MAX_VALUE, 123 }, PUnsignedInt.INSTANCE },
      { new Short[] { (short) 1, (short) 0, (short) -1, Short.MAX_VALUE, Short.MIN_VALUE,
        (short) 123, (short) -123 }, PSmallint.INSTANCE },
      { new Short[] { (short) 1, (short) 0, Short.MAX_VALUE, (short) 123 }, PSmallint.INSTANCE },
      { new Byte[] { (byte) 1, (byte) 0, (byte) -1, Byte.MAX_VALUE, Byte.MIN_VALUE, (byte) 123,
        (byte) -123 }, PTinyint.INSTANCE },
      { new Byte[] { (byte) 1, (byte) 0, Byte.MAX_VALUE, (byte) 123 }, PTinyint.INSTANCE } });
  }

  private boolean testExpression(LiteralExpression literal, double expectedResult,
    String testedFunction) throws SQLException {
    List<Expression> expressions = Lists.newArrayList((Expression) literal);
    ImmutableBytesWritable ptr = new ImmutableBytesWritable();
    Expression mathFunction = null;

    if (testedFunction.equals("SIN")) {
      mathFunction = new SinFunction(expressions);
    } else if (testedFunction.equals("COS")) {
      mathFunction = new CosFunction(expressions);
    } else if (testedFunction.equals("TAN")) {
      mathFunction = new TanFunction(expressions);
    }

    boolean ret = mathFunction.evaluate(null, ptr);
    if (ret) {
      Double result =
        (Double) mathFunction.getDataType().toObject(ptr, mathFunction.getSortOrder());
      assertTrue(BaseTest.twoDoubleEquals(result.doubleValue(), expectedResult));
    }

    return ret;
  }

  private void test(Number value, PNumericType dataType, double expectedResult,
    String testedFunction) throws SQLException {
    LiteralExpression literal = LiteralExpression.newConstant(value, dataType, SortOrder.ASC);
    boolean ret1 = testExpression(literal, expectedResult, testedFunction);

    literal = LiteralExpression.newConstant(value, dataType, SortOrder.DESC);
    boolean ret2 = testExpression(literal, expectedResult, testedFunction);
    assertEquals(ret1, ret2);
  }

  @Test
  public void testBatch() throws SQLException {
    for (int i = 0; i < value.length; ++i) {
      test(value[i], dataType, Math.sin(value[i].doubleValue()), "SIN");
      test(value[i], dataType, Math.cos(value[i].doubleValue()), "COS");
      test(value[i], dataType, Math.tan(value[i].doubleValue()), "TAN");
    }
  }
}
