/*
 * 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.sync.workspace;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.idea.blaze.base.BlazeTestCase;
import com.google.idea.blaze.base.ideinfo.ArtifactLocation;
import com.google.idea.blaze.base.io.FileAttributeProvider;
import com.google.idea.blaze.base.model.primitives.ExecutionRootPath;
import com.google.idea.blaze.base.model.primitives.WorkspaceRoot;
import com.google.repackaged.devtools.build.lib.ideinfo.androidstudio.AndroidStudioIdeInfo;
import com.google.repackaged.devtools.build.lib.ideinfo.androidstudio.PackageManifestOuterClass;
import org.jetbrains.annotations.NotNull;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import java.io.File;
import java.util.List;
import java.util.Set;

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

/**
 * Test cases for {@link ArtifactLocationDecoder}.
 */
@RunWith(JUnit4.class)
public class ArtifactLocationDecoderTest extends BlazeTestCase {

  private static final WorkspaceRoot WORKSPACE_ROOT = new WorkspaceRoot(new File("/path/to/root"));
  private static final String EXECUTION_ROOT = "/path/to/_blaze_user/1234bf129e/root";

  private static final BlazeRoots BLAZE_GIT5_ROOTS = new BlazeRoots(
    new File(EXECUTION_ROOT),
    ImmutableList.of(
      WORKSPACE_ROOT.directory(),
      new File(WORKSPACE_ROOT.directory().getParentFile(), "READONLY/root")
    ),
    new ExecutionRootPath("root/blaze-out/crosstool/bin"),
    new ExecutionRootPath("root/blaze-out/crosstool/genfiles")
  );

  private static final BlazeRoots BLAZE_CITC_ROOTS = new BlazeRoots(
    new File(EXECUTION_ROOT),
    ImmutableList.of(WORKSPACE_ROOT.directory()),
    new ExecutionRootPath("root/blaze-out/crosstool/bin"),
    new ExecutionRootPath("root/blaze-out/crosstool/genfiles")
  );

  static class MockFileAttributeProvider extends FileAttributeProvider {
    final Set<File> files = Sets.newHashSet();

    void addFiles(@NotNull File... files) {
      this.files.addAll(Lists.newArrayList(files));
    }

    @Override
    public boolean exists(@NotNull File file) {
      return files.contains(file);
    }
  }

  private MockFileAttributeProvider fileChecker;

  @Override
  protected void initTest(
    @NotNull Container applicationServices,
    @NotNull Container projectServices) {
    super.initTest(applicationServices, projectServices);

    fileChecker = new MockFileAttributeProvider();
    applicationServices.register(
      FileAttributeProvider.class,
      fileChecker
    );
  }

  @Test
  public void testManualPackagePaths() throws Exception {
    List<File> packagePaths = ImmutableList.of(
      WORKSPACE_ROOT.directory(),
      new File(WORKSPACE_ROOT.directory().getParentFile(), "READONLY/root"),
      new File(WORKSPACE_ROOT.directory().getParentFile(), "CUSTOM/root")
    );

    BlazeRoots BLAZE_ROOTS = new BlazeRoots(
      new File(EXECUTION_ROOT),
      packagePaths,
      new ExecutionRootPath("root/blaze-out/crosstool/bin"),
      new ExecutionRootPath("root/blaze-out/crosstool/genfiles")
    );

    fileChecker.addFiles(new File(packagePaths.get(0), "com/google/Bla.java"),
                         new File(packagePaths.get(1), "com/google/Foo.java"),
                         new File(packagePaths.get(2), "com/other/Test.java"));

    ArtifactLocationDecoder decoder = new ArtifactLocationDecoder(BLAZE_ROOTS, new WorkspacePathResolverImpl(WORKSPACE_ROOT, BLAZE_ROOTS));

    ArtifactLocationBuilder builder = new ArtifactLocationBuilder()
      .setRootPath("UNUSED_DUMMY")
      .setRelativePath("com/google/Bla.java")
      .setIsSource(true)
      .setVersion(Version.Current);

    assertThat(decoder.decode(builder.buildIdeInfoArtifact()).getRootPath())
      .isEqualTo(packagePaths.get(0).toString());

    builder.setRelativePath("com/google/Foo.java");

    assertThat(decoder.decode(builder.buildIdeInfoArtifact()).getRootPath())
      .isEqualTo(packagePaths.get(1).toString());

    builder.setRelativePath("com/other/Test.java");

    assertThat(decoder.decode(builder.buildIdeInfoArtifact()).getRootPath())
      .isEqualTo(packagePaths.get(2).toString());

    builder
      .setRootPath(WORKSPACE_ROOT.toString())
      .setRelativePath("third_party/other/Temp.java");

    assertThat(decoder.decode(builder.buildIdeInfoArtifact())).isNull();
  }

  @Test
  public void testDerivedArtifactAllVersions() throws Exception {
    ArtifactLocationBuilder builder = new ArtifactLocationBuilder()
      .setRootPath(EXECUTION_ROOT + "/blaze-out/bin")
      .setRootExecutionPathFragment("/blaze-out/bin")
      .setRelativePath("com/google/Bla.java")
      .setIsSource(false)
      .setVersion(Version.Current);

    ArtifactLocationDecoder decoder = new ArtifactLocationDecoder(BLAZE_CITC_ROOTS, null);

    ArtifactLocation parsed = decoder.decode(builder.buildIdeInfoArtifact());

    assertThat(parsed)
      .isEqualTo(decoder.decode(builder.buildManifestArtifact()));

    assertThat(parsed).isEqualTo(
      ArtifactLocation.builder()
        .setRootPath(EXECUTION_ROOT + "/blaze-out/bin")
        .setRootExecutionPathFragment("/blaze-out/bin")
        .setRelativePath("com/google/Bla.java")
        .setIsSource(false)
        .build());

    assertThat(parsed).isEqualTo(
      decoder.decode(
        builder.setVersion(Version.Past).buildIdeInfoArtifact()
      ));

    ArtifactLocation future = decoder.decode(
      builder.setVersion(Version.Future).buildIdeInfoArtifact());

    assertThat(future).isEqualTo(
      ArtifactLocation.builder()
        .setRootPath(EXECUTION_ROOT + "/blaze-out/bin")
        .setRootExecutionPathFragment("/blaze-out/bin")
        .setRelativePath("com/google/Bla.java")
        .setIsSource(false)
        .build());
  }

  @Test
  public void testSourceArtifactAllVersions() throws Exception {
    ArtifactLocationBuilder builder = new ArtifactLocationBuilder()
      .setRootPath(WORKSPACE_ROOT.toString())
      .setRelativePath("com/google/Bla.java")
      .setIsSource(true)
      .setVersion(Version.Current);

    ArtifactLocationDecoder decoder = new ArtifactLocationDecoder(BLAZE_CITC_ROOTS,
                                                                  new WorkspacePathResolverImpl(WORKSPACE_ROOT, BLAZE_CITC_ROOTS));

    ArtifactLocation parsed = decoder.decode(builder.buildIdeInfoArtifact());

    assertThat(parsed)
      .isEqualTo(decoder.decode(builder.buildManifestArtifact()));

    assertThat(parsed).isEqualTo(
      ArtifactLocation.builder()
        .setRootPath(WORKSPACE_ROOT.toString())
        .setRelativePath("com/google/Bla.java")
        .setIsSource(true)
        .build());

    assertThat(parsed).isEqualTo(
      decoder.decode(
        builder.setVersion(Version.Past).buildIdeInfoArtifact()
      ));

    ArtifactLocation future = decoder.decode(
      builder.setVersion(Version.Future).buildIdeInfoArtifact());

    assertThat(future).isEqualTo(
      ArtifactLocation.builder()
        .setRootPath(WORKSPACE_ROOT.toString())
        .setRelativePath("com/google/Bla.java")
        .setIsSource(true)
        .build());
  }

  enum Version {
    Past, // no rootExecutionPathFragment
    Current, // everything
    Future // no rootPath
  }

  static class ArtifactLocationBuilder {
    Version version;
    String rootPath;
    String rootExecutionPathFragment = "";
    String relativePath;
    boolean isSource;


    ArtifactLocationBuilder setVersion(Version version) {
      this.version = version;
      return this;
    }

    ArtifactLocationBuilder setRootPath(String rootPath) {
      this.rootPath = rootPath;
      return this;
    }

    ArtifactLocationBuilder setRootExecutionPathFragment(String rootExecutionPathFragment) {
      this.rootExecutionPathFragment = rootExecutionPathFragment;
      return this;
    }

    ArtifactLocationBuilder setRelativePath(String relativePath) {
      this.relativePath = relativePath;
      return this;
    }

    ArtifactLocationBuilder setIsSource(boolean isSource) {
      this.isSource = isSource;
      return this;
    }

    AndroidStudioIdeInfo.ArtifactLocation buildIdeInfoArtifact() {
      AndroidStudioIdeInfo.ArtifactLocation.Builder builder = AndroidStudioIdeInfo.ArtifactLocation.newBuilder()
        .setIsSource(isSource)
        .setRelativePath(relativePath);
      if (version != Version.Past) {
        builder.setRootExecutionPathFragment(rootExecutionPathFragment);
      }
      if (version != Version.Future) {
        builder.setRootPath(rootPath);
      }
      return builder.build();
    }

    PackageManifestOuterClass.ArtifactLocation buildManifestArtifact() {
      PackageManifestOuterClass.ArtifactLocation.Builder builder = PackageManifestOuterClass.ArtifactLocation.newBuilder()
        .setIsSource(isSource)
        .setRelativePath(relativePath);
      if (version != Version.Past) {
        builder.setRootExecutionPathFragment(rootExecutionPathFragment);
      }
      if (version != Version.Future) {
        builder.setRootPath(rootPath);
      }
      return builder.build();
    }
  }

}