/*
 * 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.drill.exec.fn.impl;

import org.apache.drill.categories.OperatorTest;
import org.apache.drill.categories.UnlikelyTest;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
import org.apache.drill.exec.ops.FragmentContextImpl;
import org.apache.drill.exec.physical.PhysicalPlan;
import org.apache.drill.exec.physical.base.FragmentRoot;
import org.apache.drill.exec.physical.impl.ImplCreator;
import org.apache.drill.exec.physical.impl.SimpleRootExec;
import org.apache.drill.exec.planner.PhysicalPlanReader;
import org.apache.drill.exec.planner.PhysicalPlanReaderTestFactory;
import org.apache.drill.exec.proto.BitControl.PlanFragment;
import org.apache.drill.exec.rpc.UserClientConnection;
import org.apache.drill.exec.server.DrillbitContext;
import org.apache.drill.exec.vector.ValueVector;
import org.apache.drill.exec.vector.VarCharVector;
import org.apache.drill.test.BaseTestQuery;

import org.apache.hadoop.conf.Configuration;
import org.apache.parquet.column.ParquetProperties;
import org.apache.parquet.example.data.Group;
import org.apache.parquet.example.data.simple.SimpleGroupFactory;
import org.apache.parquet.hadoop.ParquetWriter;
import org.apache.parquet.hadoop.example.GroupWriteSupport;
import org.apache.parquet.hadoop.metadata.CompressionCodecName;
import org.apache.parquet.schema.MessageType;
import org.apache.parquet.schema.MessageTypeParser;
import org.apache.commons.io.FileUtils;

import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.mockito.Mockito;

import com.google.common.base.Charsets;
import com.google.common.io.Resources;

import java.io.File;
import java.math.BigDecimal;

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

@Category({UnlikelyTest.class, OperatorTest.class})
public class TestNewMathFunctions extends BaseTestQuery {
  private final DrillConfig c = DrillConfig.create();
  private PhysicalPlanReader reader;
  private FunctionImplementationRegistry registry;
  private FragmentContextImpl context;

  public Object[] getRunResult(SimpleRootExec exec) {
    int size = 0;
    for (final ValueVector v : exec) {
      size++;
    }

    final Object[] res = new Object[size];
    int i = 0;
    for (final ValueVector v : exec) {
      if  (v instanceof VarCharVector) {
        res[i++] = new String( ((VarCharVector) v).getAccessor().get(0));
      } else {
        res[i++] =  v.getAccessor().getObject(0);
      }
    }
    return res;
  }

  public void runTest(Object[] expectedResults, String planPath) throws Throwable {

    final DrillbitContext bitContext = mockDrillbitContext();
    final UserClientConnection connection = Mockito.mock(UserClientConnection.class);

    final String planString = Resources.toString(Resources.getResource(planPath), Charsets.UTF_8);
    if (reader == null) {
      reader = PhysicalPlanReaderTestFactory.defaultPhysicalPlanReader(c);
    }
    if (registry == null) {
      registry = new FunctionImplementationRegistry(c);
    }
    if (context == null) {
      context = new FragmentContextImpl(bitContext, PlanFragment.getDefaultInstance(), connection, registry);
    }
    final PhysicalPlan plan = reader.readPhysicalPlan(planString);
    final SimpleRootExec exec = new SimpleRootExec(ImplCreator.getExec(context, (FragmentRoot) plan.getSortedOperators(false).iterator().next()));

    while (exec.next()) {
      final Object [] res = getRunResult(exec);
      assertEquals("return count does not match", expectedResults.length, res.length);

      for (int i = 0; i<res.length; i++) {
        assertEquals(String.format("column %s does not match", i),  res[i], expectedResults[i]);
      }
    }

    if (context.getExecutorState().getFailureCause() != null) {
      throw context.getExecutorState().getFailureCause();
    }

    assertTrue(!context.getExecutorState().isFailed());
  }

  @Test
  public void testTrigoMathFunc() throws Throwable {
    final Object [] expected = new Object[] {Math.sin(45), Math.cos(45), Math.tan(45),Math.asin(45), Math.acos(45), Math.atan(45),Math.sinh(45), Math.cosh(45), Math.tanh(45)};
    runTest(expected, "functions/testTrigoMathFunctions.json");
  }

  @Test
  public void testExtendedMathFunc() throws Throwable {
    final BigDecimal d = new BigDecimal("100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001");
    final Object [] expected = new Object[] {
            Math.cbrt(1000),
            Math.log(10),
            Math.log10(5),
            (Math.log(64.0) / Math.log(2.0)),
            Math.exp(10), Math.toDegrees(0.5),
            Math.toRadians(45.0),
            Math.PI,
            Math.cbrt(d.doubleValue()),
            Math.log(d.doubleValue()),
            (Math.log(d.doubleValue()) / Math.log(2)),
            Math.exp(d.doubleValue()),
            Math.toDegrees(d.doubleValue()),
            Math.toRadians(d.doubleValue())
    };
    runTest(expected, "functions/testExtendedMathFunctions.json");
  }

  @Test
  public void testTruncDivMod() throws Throwable{
    final Object [] expected = new Object[] {101.0, 0, 101, 1010.0, 101, 481.0, 0.001099999999931267};
    runTest(expected, "functions/testDivModTruncFunctions.json");
  }

  @Test
  public void testBitTwiddlers() throws Throwable {
    final Object [] expected = new Object[] { 3072, 3, 14 };
    // Note bitwise AND and OR do not have Drill function implementations
    runTest(expected, "functions/testBitTwiddlers.json");
  }

  @Test
  public void testIsNumeric() throws Throwable{
    final Object [] expected = new Object[] {1, 1, 1, 0};
    runTest(expected, "functions/testIsNumericFunction.json");
  }

  @Test
  public void testLog10WithDouble() throws Throwable {
    String json = "{" +
          "\"positive_infinity\" : Infinity," +
          "\"negative_infinity\" : -Infinity," +
          "\"nan\" : NaN," +
          "\"num1\": 0.0," +
          "\"num2\": 0.1," +
          "\"num3\": 1.0," +
          "\"num4\": 1.5," +
          "\"num5\": -1.5," +
          "\"num6\": 10.0" +
          "}";
    String query =
        "select " +
            "log10(positive_infinity) as pos_inf, " +
            "log10(negative_infinity) as neg_inf, " +
            "log10(nan) as nan, " +
            "log10(num1) as num1, " +
            "log10(num2) as num2, " +
            "log10(num3) as num3, " +
            "log10(num4) as num4, " +
            "log10(num5) as num5, " +
            "log10(num6) as num6 " +
        "from dfs.`data.json`";
    File file = new File(dirTestWatcher.getRootDir(), "data.json");
    try {
      FileUtils.writeStringToFile(file, json);
      setSessionOption(ExecConstants.JSON_READ_NUMBERS_AS_DOUBLE, true);
      setSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS, true);
      testBuilder()
              .sqlQuery(query)
              .ordered()
              .baselineColumns("pos_inf", "neg_inf", "nan", "num1", "num2", "num3", "num4", "num5", "num6")
              .baselineValues(Double.POSITIVE_INFINITY, Double.NaN, Double.NaN, Double.NEGATIVE_INFINITY,
                      -1.0d, 0d, 0.17609125905568124d, Double.NaN, 1.0d)
              .go();
    } finally {
      resetSessionOption(ExecConstants.JSON_READ_NUMBERS_AS_DOUBLE);
      resetSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS);
      FileUtils.deleteQuietly(file);
    }
  }

  @Test
  public void testLog10WithFloat() throws Throwable {
    String json = "{" +
            "\"positive_infinity\" : Infinity," +
            "\"negative_infinity\" : -Infinity," +
            "\"nan\" : NaN," +
            "\"num1\": 0.0," +
            "\"num2\": 0.1," +
            "\"num3\": 1.0," +
            "\"num4\": 1.5," +
            "\"num5\": -1.5," +
            "\"num6\": 10.0" +
            "}";
    String query =
        "select " +
            "log10(cast(positive_infinity as float)) as pos_inf, " +
            "log10(cast(negative_infinity as float)) as neg_inf, " +
            "log10(cast(nan as float)) as nan, " +
            "log10(cast(num1 as float)) as num1, " +
            "log10(cast(num2 as float)) as num2, " +
            "log10(cast(num3 as float)) as num3, " +
            "log10(cast(num4 as float)) as num4, " +
            "log10(cast(num5 as float)) as num5, " +
            "log10(cast(num6 as float)) as num6 " +
        "from dfs.`data.json`";
    File file = new File(dirTestWatcher.getRootDir(), "data.json");
    try {
      FileUtils.writeStringToFile(file, json);
      setSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS, true);
      testBuilder()
              .sqlQuery(query)
              .ordered()
              .baselineColumns("pos_inf", "neg_inf", "nan", "num1", "num2", "num3", "num4", "num5", "num6")
              .baselineValues(Double.POSITIVE_INFINITY, Double.NaN, Double.NaN, Double.NEGATIVE_INFINITY,
                      -0.999999993528508d, 0d, 0.17609125905568124d, Double.NaN, 1.0d)
              .go();
    } finally {
      resetSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS);
      FileUtils.deleteQuietly(file);
    }
  }

  @Test
  public void testLog10WithInt() throws Throwable {
    String json = "{" +
            "\"num1\": 0.0," +
            "\"num3\": 1.0," +
            "\"num5\": -1.0," +
            "\"num6\": 10.0" +
            "}";
    String query =
        "select " +
            "log10(cast(num1 as int)) as num1, " +
            "log10(cast(num3 as int)) as num3, " +
            "log10(cast(num5 as int)) as num5, " +
            "log10(cast(num6 as int)) as num6 " +
        "from dfs.`data.json`";
    File file = new File(dirTestWatcher.getRootDir(), "data.json");
    try {
      FileUtils.writeStringToFile(file, json);
      setSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS, true);
      testBuilder()
              .sqlQuery(query)
              .ordered()
              .baselineColumns("num1",  "num3", "num5", "num6")
              .baselineValues(Double.NEGATIVE_INFINITY, 0d, Double.NaN, 1.0d)
              .go();
    } finally {
      resetSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS);
      FileUtils.deleteQuietly(file);
    }
  }

  @Test
  public void testLog10WithBigInt() throws Throwable {
    String json = "{" +
            "\"num1\": 0," +
            "\"num3\": 1," +
            "\"num5\": -1," +
            "\"num6\": 10" +
            "}";
    String query =
        "select " +
            "log10(num1) as num1, " +
            "log10(num3) as num3, " +
            "log10(num5) as num5, " +
            "log10(num6) as num6 " +
        "from dfs.`data.json`";
    File file = new File(dirTestWatcher.getRootDir(), "data.json");
    try {
      FileUtils.writeStringToFile(file, json);

      setSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS, true);
      testBuilder()
              .sqlQuery(query)
              .ordered()
              .baselineColumns("num1",  "num3", "num5", "num6")
              .baselineValues(Double.NEGATIVE_INFINITY, 0d, Double.NaN, 1.0d)
              .go();
    } finally {
      resetSessionOption(ExecConstants.JSON_READER_NAN_INF_NUMBERS);
      FileUtils.deleteQuietly(file);
    }
  }


  @Test
  public void testLog10WithUint4() throws Exception {
    org.apache.hadoop.fs.Path file = new org.apache.hadoop.fs.Path(dirTestWatcher.getRootDir().toString(), "uint8.parquet");
    String schemaText = "message test { required int32 val(UINT_8); }";

    Configuration conf = new Configuration();
    MessageType schema = MessageTypeParser.parseMessageType(schemaText);
    GroupWriteSupport.setSchema(schema, conf);
    SimpleGroupFactory groupFactory = new SimpleGroupFactory(schema);

    try {
      try (ParquetWriter<Group> writer = new ParquetWriter<>(
              file,
              new GroupWriteSupport(),
              CompressionCodecName.UNCOMPRESSED, 1024, 1024, 512, true, false,
              ParquetProperties.WriterVersion.PARQUET_1_0, conf)) {

        writer.write(groupFactory.newGroup().append("val", 0));
        writer.write(groupFactory.newGroup().append("val", 1));
        writer.write(groupFactory.newGroup().append("val", -1));
        writer.write(groupFactory.newGroup().append("val", 10));
      }
      String query = "select log10(val) as col from dfs.`uint8.parquet`";
      testBuilder()
              .sqlQuery(query)
              .unOrdered()
              .baselineColumns("col")
              .baselineValues(Double.NEGATIVE_INFINITY)
              .baselineValues(0d)
              .baselineValues(Double.NaN)
              .baselineValues(1.0d)
              .build()
              .run();
    } finally {
      FileUtils.deleteQuietly(new File(file.toString()));
    }
  }

}