// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.android.desugar.dependencies;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.Dependency;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.DesugarDepsInfo;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceDetails;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceWithCompanion;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.Type;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link MetadataCollector}. */
@RunWith(JUnit4.class)
public class MetadataCollectorTest {

  @Test
  public void testEmptyAvoidsOutput() {
    assertThat(new MetadataCollector(false).toByteArray()).isNull();
  }

  @Test
  public void testAssumeCompanionClass() throws Exception {
    MetadataCollector collector = new MetadataCollector(false);
    collector.assumeCompanionClass("a", "b$$CC");
    collector.assumeCompanionClass("b", "b$$CC");
    collector.assumeCompanionClass("a", "a$$CC");

    DesugarDepsInfo info = extractProto(collector);
    assertThat(info.getAssumePresentList())
        .containsExactly(
            Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("b$$CC")).build(),
            Dependency.newBuilder().setOrigin(wrapType("b")).setTarget(wrapType("b$$CC")).build(),
            Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("a$$CC")).build());
  }

  @Test
  public void testMissingImplementedInterface() throws Exception {
    MetadataCollector collector = new MetadataCollector(true);
    collector.missingImplementedInterface("a", "b");
    collector.missingImplementedInterface("a", "c");
    collector.missingImplementedInterface("c", "b");

    DesugarDepsInfo info = extractProto(collector);
    assertThat(info.getMissingInterfaceList())
        .containsExactly(
            Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("b")).build(),
            Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("c")).build(),
            Dependency.newBuilder().setOrigin(wrapType("c")).setTarget(wrapType("b")).build());
  }

  @Test
  public void testRecordExtendedInterfaces() throws Exception {
    MetadataCollector collector = new MetadataCollector(false);
    collector.recordExtendedInterfaces("a", "b", "c");
    collector.recordExtendedInterfaces("b");
    collector.recordExtendedInterfaces("c", "d");

    DesugarDepsInfo info = extractProto(collector);
    assertThat(info.getInterfaceWithSupertypesList())
        .containsExactly(
            InterfaceDetails.newBuilder()
                .setOrigin(wrapType("a"))
                .addAllExtendedInterface(ImmutableList.of(wrapType("b"), wrapType("c")))
                .build(),
            InterfaceDetails.newBuilder()
                .setOrigin(wrapType("c"))
                .addAllExtendedInterface(ImmutableList.of(wrapType("d")))
                .build());
  }

  @Test
  public void testRecordDefaultMethods() throws Exception {
    MetadataCollector collector = new MetadataCollector(false);
    collector.recordDefaultMethods("a", 0);
    collector.recordDefaultMethods("b", 1);

    DesugarDepsInfo info = extractProto(collector);
    assertThat(info.getInterfaceWithCompanionList())
        .containsExactly(
            InterfaceWithCompanion.newBuilder()
                .setOrigin(wrapType("a"))
                .setNumDefaultMethods(0)
                .build(),
            InterfaceWithCompanion.newBuilder()
                .setOrigin(wrapType("b"))
                .setNumDefaultMethods(1)
                .build());
  }

  private static Type wrapType(String name) {
    return Type.newBuilder().setBinaryName(name).build();
  }

  private DesugarDepsInfo extractProto(MetadataCollector collector) throws Exception {
    return DesugarDepsInfo.parseFrom(collector.toByteArray());
  }
}