/*
 * 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.sql;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import org.apache.drill.test.BaseTestQuery;
import org.apache.drill.categories.SqlTest;
import org.apache.drill.common.exceptions.UserRemoteException;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import javax.annotation.Nullable;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;

import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.MatcherAssert.assertThat;

@Category(SqlTest.class)
public class TestSimpleCastFunctions extends BaseTestQuery {

  private static final List<Function<String, String>> inputFunctions = Lists.newArrayList();

  static {
    inputFunctions.add(new Function<String, String>() {
      @Nullable
      @Override
      public String apply(String input) {
        return input.toLowerCase();
      }
    });

    inputFunctions.add(new Function<String, String>() {
      @Nullable
      @Override
      public String apply(String input) {
        return input.toUpperCase();
      }
    });

    inputFunctions.add(new Function<String, String>() {
      @Nullable
      @Override
      public String apply(String input) {
        return "   " + input + "   ";
      }
    });
  }

  @Test
  public void testCastFromBooleanToString() throws Exception {
    testBuilder()
        .sqlQuery("select" +
            " cast(false as varchar(5)) c1," +
            " cast(true as varchar(4)) c2," +
            " cast((1 < 5) as varchar(4)) c3," +
            " cast((1 > 5) as varchar(5)) c4" +
            " from (values(1))")
        .unOrdered()
        .baselineColumns("c1", "c2", "c3", "c4")
        .baselineValues("false", "true", "true", "false")
        .go();
  }

  @Test
  public void testCastStringToBooleanTrueValue() throws Exception {
    List<String> literals =  Arrays.asList("t", "true", "y", "yes", "on", "1");
    String query = "select cast('%s' as boolean) b_val from (values(1))";
    for (String literal : literals) {
      for (Function<String, String> function : inputFunctions) {
        testBuilder()
            .sqlQuery(query, function.apply(literal))
            .unOrdered()
            .baselineColumns("b_val")
            .baselineValues(true)
            .go();
      }
    }
  }

  @Test
  public void testCastStringToBooleanFalseValue() throws Exception {
    List<String> literals =  Arrays.asList("f", "false", "n", "no", "off", "0");
    String query = "select cast('%s' as boolean) b_val from (values(1))";
    for (String literal : literals) {
      for (Function<String, String> function : inputFunctions) {
        testBuilder()
            .sqlQuery(query, function.apply(literal))
            .unOrdered()
            .baselineColumns("b_val")
            .baselineValues(false)
            .go();
      }
    }
  }

  @Test
  public void testCastNumericToBooleanTrueValue() throws Exception {
    testBuilder()
        .sqlQuery("select cast(1 as boolean) b_val from (values(1))")
        .unOrdered()
        .baselineColumns("b_val")
        .baselineValues(true)
        .go();
  }

  @Test
  public void testCastNumericToBooleanFalseValue() throws Exception {
    testBuilder()
        .sqlQuery("select cast(0 as boolean) b_val from (values(1))")
        .unOrdered()
        .baselineColumns("b_val")
        .baselineValues(false)
        .go();
  }

  @Test
  public void testCastNullToBoolean() throws Exception {
    testBuilder()
        .sqlQuery("select cast(null as boolean) b_val from (values(1))")
        .unOrdered()
        .baselineColumns("b_val")
        .baselineValues((String) null)
        .go();
  }

  @Test(expected = UserRemoteException.class)
  public void testIncorrectStringBoolean() throws Exception {
    try {
      test("select cast('A' as boolean) b_val from (values(1))");
    } catch (UserRemoteException e) {
      assertThat(e.getMessage(), containsString("Invalid value for boolean: A"));
      throw e;
    }
  }

  @Test(expected = UserRemoteException.class)
  public void testIncorrectNumericBoolean() throws Exception {
    try {
      test("select cast(123 as boolean) b_val from (values(1))");
    } catch (UserRemoteException e) {
      assertThat(e.getMessage(), containsString("Invalid value for boolean: 123"));
      throw e;
    }
  }

  @Test
  public void testDecimalConstantCast() throws Exception {
    testBuilder()
        .sqlQuery("select casthigh(cast(1025.0 as decimal(28,8))) a")
        .unOrdered()
        .baselineColumns("a")
        .baselineValues(BigDecimal.valueOf(102500000000L, 8))
        .go();
  }

  @Test
  public void testNullableDecimalConstantCast() throws Exception {
    testBuilder()
        .sqlQuery("select casthigh(case when true then cast(1025.0 as decimal(28,8)) else null end) a")
        .unOrdered()
        .baselineColumns("a")
        .baselineValues(BigDecimal.valueOf(102500000000L, 8))
        .go();

  }

  @Test
  public void testDecimalCastAsVariable() throws Exception {
    testBuilder()
        .sqlQuery("select casthigh(cast(a as decimal(28,8))) a from (VALUES (1.0), (2.0), (3.0)) as t1(a)")
        .unOrdered()
        .baselineColumns("a")
        .baselineValues(BigDecimal.valueOf(100000000, 8))
        .baselineValues(BigDecimal.valueOf(200000000, 8))
        .baselineValues(BigDecimal.valueOf(300000000, 8))
        .go();
  }

}