/*
 * 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.beam.sdk.schemas.transforms;

import static org.hamcrest.Matchers.containsString;
import static org.junit.Assert.assertEquals;

import java.util.Arrays;
import org.apache.beam.sdk.schemas.Schema;
import org.apache.beam.sdk.testing.NeedsRunner;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.testing.UsesSchema;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.Row;
import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableMap;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link Cast}. */
@RunWith(JUnit4.class)
@Category(UsesSchema.class)
public class CastTest {

  @Rule public final transient TestPipeline pipeline = TestPipeline.create();
  @Rule public transient ExpectedException expectedException = ExpectedException.none();

  @Test
  @Category(NeedsRunner.class)
  public void testProjection() {
    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT32),
            Schema.Field.of("f2", Schema.FieldType.STRING));

    // remove f0 and reorder f1 and f2
    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f2", Schema.FieldType.STRING),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Row input = Row.withSchema(inputSchema).addValues((short) 1, 2, "3").build();
    Row expected = Row.withSchema(outputSchema).addValues("3", 2).build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.widening(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  @Category(NeedsRunner.class)
  public void testTypeWiden() {
    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Row input = Row.withSchema(inputSchema).addValues((short) 1, 2).build();
    Row expected = Row.withSchema(outputSchema).addValues(1, 2L).build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.widening(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  public void testTypeWidenFail() {
    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage(containsString("f1: Can't cast 'INT64' to 'INT32'"));

    Cast.widening(outputSchema).verifyCompatibility(inputSchema);
  }

  @Test
  @Category(NeedsRunner.class)
  public void testTypeNarrow() {
    // the same as testTypeWiden, but to casting to the opposite direction

    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Row input = Row.withSchema(inputSchema).addValues(1, 2L).build();
    Row expected = Row.withSchema(outputSchema).addValues((short) 1, 2).build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.narrowing(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  @Category(NeedsRunner.class)
  public void testWeakenNullable() {
    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.nullable("f1", Schema.FieldType.INT64));

    Row input = Row.withSchema(inputSchema).addValues((short) 1, 2).build();
    Row expected = Row.withSchema(outputSchema).addValues(1, 2L).build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.widening(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  @Category(NeedsRunner.class)
  public void testIgnoreNullable() {
    // the opposite of testWeakenNullable

    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.nullable("f1", Schema.FieldType.INT64));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.nullable("f1", Schema.FieldType.INT32));

    Row input = Row.withSchema(inputSchema).addValues(1, 2L).build();
    Row expected = Row.withSchema(outputSchema).addValues((short) 1, 2).build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.narrowing(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  public void testIgnoreNullableFail() {
    // the opposite of testWeakenNullable

    Schema inputSchema = Schema.of(Schema.Field.nullable("f0", Schema.FieldType.INT32));

    Schema outputSchema = Schema.of(Schema.Field.of("f0", Schema.FieldType.INT64));

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage(
        containsString("f0: Can't cast nullable field to non-nullable field"));

    Cast.widening(outputSchema).verifyCompatibility(inputSchema);
  }

  @Test
  @Category(NeedsRunner.class)
  public void testCastInnerRow() {
    Schema innerInputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.row(innerInputSchema)),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema innerOutputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.row(innerOutputSchema)),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Row input =
        Row.withSchema(inputSchema)
            .addValue(Row.withSchema(innerInputSchema).addValues((short) 1, 2).build())
            .addValue(42)
            .build();

    Row expected =
        Row.withSchema(outputSchema)
            .addValue(Row.withSchema(innerOutputSchema).addValues(1, 2L).build())
            .addValue(42L)
            .build();

    PCollection<Row> output =
        pipeline
            .apply(Create.of(input).withRowSchema(inputSchema))
            .apply(Cast.widening(outputSchema));

    PAssert.that(output).containsInAnyOrder(expected);

    pipeline.run();
  }

  @Test
  public void testCastInnerRowFail() {
    Schema innerInputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT16),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    Schema inputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.row(innerInputSchema)),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema innerOutputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.INT32),
            Schema.Field.of("f1", Schema.FieldType.INT32));

    Schema outputSchema =
        Schema.of(
            Schema.Field.of("f0", Schema.FieldType.row(innerOutputSchema)),
            Schema.Field.of("f1", Schema.FieldType.INT64));

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage(containsString("f0.f1: Can't cast 'INT64' to 'INT32'"));

    Cast.widening(outputSchema).verifyCompatibility(inputSchema);
  }

  @Test
  public void testCastArray() {
    Object output =
        Cast.castValue(
            Arrays.asList((short) 1, (short) 2, (short) 3),
            Schema.FieldType.array(Schema.FieldType.INT16),
            Schema.FieldType.array(Schema.FieldType.INT32));

    assertEquals(Arrays.asList(1, 2, 3), output);
  }

  @Test
  public void testCastMap() {
    Object output =
        Cast.castValue(
            ImmutableMap.of((short) 1, 1, (short) 2, 2, (short) 3, 3),
            Schema.FieldType.map(Schema.FieldType.INT16, Schema.FieldType.INT32),
            Schema.FieldType.map(Schema.FieldType.INT32, Schema.FieldType.INT64));

    assertEquals(ImmutableMap.of(1, 1L, 2, 2L, 3, 3L), output);
  }
}