/*
 * Copyright 2016 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.idea.blaze.base.rulemaps;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.idea.blaze.base.BlazeTestCase;
import com.google.idea.blaze.base.ideinfo.ArtifactLocation;
import com.google.idea.blaze.base.ideinfo.RuleIdeInfo;
import com.google.idea.blaze.base.model.primitives.Label;
import com.google.idea.blaze.base.ideinfo.RuleMapBuilder;
import org.jetbrains.annotations.NotNull;
import org.junit.Test;

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

public class ReverseDependencyMapTest extends BlazeTestCase {
  @Override
  protected void initTest(@NotNull Container applicationServices, @NotNull Container projectServices) {
    super.initTest(applicationServices, projectServices);
  }

  @Test
  public void testSingleDep() {
    RuleMapBuilder builder = RuleMapBuilder.builder();
    ImmutableMap<Label, RuleIdeInfo> ruleMap = builder
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l1")
                 .setKind("java_library")
                 .addDependency("//l:l2"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l2")
                 .setKind("java_library"))
      .build();

    ImmutableMultimap<Label, Label> reverseDependencies = ReverseDependencyMap.createRdepsMap(ruleMap);
    assertThat(reverseDependencies).containsEntry(new Label("//l:l2"), new Label("//l:l1"));
  }

  @Test
  public void testLabelDepsOnTwoLabels() {
    RuleMapBuilder builder = RuleMapBuilder.builder();
    ImmutableMap<Label, RuleIdeInfo> ruleMap = builder
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l1")
                 .setKind("java_library")
                 .addDependency("//l:l2")
                 .addDependency("//l:l3"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l2")
                 .setKind("java_library"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l3")
                 .setKind("java_library"))
      .build();

    ImmutableMultimap<Label, Label> reverseDependencies = ReverseDependencyMap.createRdepsMap(ruleMap);
    assertThat(reverseDependencies).containsEntry(new Label("//l:l2"), new Label("//l:l1"));
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l1"));
  }

  @Test
  public void testTwoLabelsDepOnSameLabel() {
    RuleMapBuilder builder = RuleMapBuilder.builder();
    ImmutableMap<Label, RuleIdeInfo> ruleMap = builder
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l1")
                 .setKind("java_library")
                 .addDependency("//l:l3"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l2")
                 .addDependency("//l:l3")
                 .setKind("java_library"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l3")
                 .setKind("java_library"))
      .build();

    ImmutableMultimap<Label, Label> reverseDependencies = ReverseDependencyMap.createRdepsMap(ruleMap);
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l1"));
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l2"));
  }

  @Test
  public void testThreeLevelGraph() {
    RuleMapBuilder builder = RuleMapBuilder.builder();
    ImmutableMap<Label, RuleIdeInfo> ruleMap = builder
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l1")
                 .setKind("java_library")
                 .addDependency("//l:l3"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l2")
                 .addDependency("//l:l3")
                 .setKind("java_library"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l3")
                 .setKind("java_library"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l4")
                 .addDependency("//l:l3")
                 .setKind("java_library"))
      .addRule(RuleIdeInfo.builder()
                 .setBuildFile(sourceRoot("test/BUILD"))
                 .setLabel("//l:l5")
                 .addDependency("//l:l4")
                 .setKind("java_library"))
      .build();

    ImmutableMultimap<Label, Label> reverseDependencies = ReverseDependencyMap.createRdepsMap(ruleMap);
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l1"));
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l2"));
    assertThat(reverseDependencies).containsEntry(new Label("//l:l3"), new Label("//l:l4"));
    assertThat(reverseDependencies).containsEntry(new Label("//l:l4"), new Label("//l:l5"));
  }

  private static ArtifactLocation sourceRoot(String relativePath) {
    return ArtifactLocation.builder()
      .setRootPath("/")
      .setRelativePath(relativePath)
      .setIsSource(true)
      .build();
  }
}