// 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.lib.rules.android;

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

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.packages.RuleClass.ConfiguredTargetFactory.RuleErrorException;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.Optional;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests {@link AndroidResources} */
@RunWith(JUnit4.class)
public class AndroidResourcesTest extends ResourceTestBase {
  private static final PathFragment DEFAULT_RESOURCE_ROOT = PathFragment.create(RESOURCE_ROOT);
  private static final ImmutableList<PathFragment> RESOURCES_ROOTS =
      ImmutableList.of(DEFAULT_RESOURCE_ROOT);

  @Before
  @Test
  public void testGetResourceRootsNoResources() throws Exception {
    assertThat(getResourceRoots()).isEmpty();
  }

  @Test
  public void testGetResourceRootsInvalidResourceDirectory() throws Exception {
    try {
      getResourceRoots("is-this-drawable-or-values/foo.xml");
      assertWithMessage("Expected exception not thrown!").fail();
    } catch (RuleErrorException e) {
      // expected
    }

    errorConsumer.assertAttributeError(
        "resource_files", "is not in the expected resource directory structure");
  }

  @Test
  public void testGetResourceRootsMultipleRoots() throws Exception {
    try {
      getResourceRoots("subdir/values/foo.xml", "otherdir/values/bar.xml");
      assertWithMessage("Expected exception not thrown!").fail();
    } catch (RuleErrorException e) {
      // expected
    }

    errorConsumer.assertAttributeError(
        "resource_files", "All resources must share a common directory");
  }

  @Test
  public void testGetResourceRoots() throws Exception {
    assertThat(getResourceRoots("values-hdpi/foo.xml", "values-mdpi/bar.xml"))
        .isEqualTo(RESOURCES_ROOTS);
  }

  @Test
  public void testGetResourceRootsCommonSubdirectory() throws Exception {
    assertThat(getResourceRoots("subdir/values-hdpi/foo.xml", "subdir/values-mdpi/bar.xml"))
        .containsExactly(DEFAULT_RESOURCE_ROOT.getRelative("subdir"));
  }

  private ImmutableList<PathFragment> getResourceRoots(String... pathResourceStrings)
      throws Exception {
    return getResourceRoots(getResources(pathResourceStrings));
  }

  private ImmutableList<PathFragment> getResourceRoots(ImmutableList<Artifact> artifacts)
      throws Exception {
    return AndroidResources.getResourceRoots(errorConsumer, artifacts, "resource_files");
  }

  @Test
  public void testFilterEmpty() throws Exception {
    assertFilter(ImmutableList.of(), ImmutableList.of());
  }

  @Test
  public void testFilterNoop() throws Exception {
    ImmutableList<Artifact> resources = getResources("values-en/foo.xml", "values-es/bar.xml");
    assertFilter(resources, resources);
  }

  @Test
  public void testFilterToEmpty() throws Exception {
    assertFilter(getResources("values-en/foo.xml", "values-es/bar.xml"), ImmutableList.of());
  }

  @Test
  public void testPartiallyFilter() throws Exception {
    Artifact keptResource = getResource("values-en/foo.xml");
    assertFilter(
        ImmutableList.of(keptResource, getResource("values-es/bar.xml")),
        ImmutableList.of(keptResource));
  }

  @Test
  public void testFilterIsDependency() throws Exception {
    Artifact keptResource = getResource("values-en/foo.xml");
    assertFilter(
        ImmutableList.of(keptResource, getResource("drawable/bar.png")),
        ImmutableList.of(keptResource),
        /* isDependency = */ true);
  }

  @Test
  public void testFilterValidatedNoop() throws Exception {
    ImmutableList<Artifact> resources = getResources("values-en/foo.xml", "values-es/bar.xml");
    assertFilterValidated(resources, resources);
  }

  @Test
  public void testFilterValidated() throws Exception {
    Artifact keptResource = getResource("values-en/foo.xml");
    assertFilterValidated(
        ImmutableList.of(keptResource, getResource("drawable/bar.png")),
        ImmutableList.of(keptResource));
  }

  private void assertFilterValidated(
      ImmutableList<Artifact> unfilteredResources, ImmutableList<Artifact> filteredResources)
      throws Exception {
    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ false);
    ValidatedAndroidResources unfiltered =
        new AndroidResources(unfilteredResources, getResourceRoots(unfilteredResources))
            .process(ruleContext, getManifest(), /* neverlink = */ false);
    Optional<? extends AndroidResources> maybeFiltered =
        assertFilter(unfiltered, filteredResources, /* isDependency = */ true);

    if (maybeFiltered.isPresent()) {
      AndroidResources filtered = maybeFiltered.get();
      assertThat(filtered instanceof ValidatedAndroidResources).isTrue();
      ValidatedAndroidResources validated = (ValidatedAndroidResources) filtered;

      // Validate fields related to validation are unchanged
      assertThat(validated.getRTxt()).isEqualTo(unfiltered.getRTxt());
      assertThat(validated.getAapt2RTxt()).isEqualTo(unfiltered.getAapt2RTxt());
    }
  }

  private void assertFilter(
      ImmutableList<Artifact> unfilteredResources, ImmutableList<Artifact> filteredResources)
      throws Exception {
    assertFilter(unfilteredResources, filteredResources, /* isDependency = */ false);
  }

  private void assertFilter(
      ImmutableList<Artifact> unfilteredResources,
      ImmutableList<Artifact> filteredResources,
      boolean isDependency)
      throws Exception {
    AndroidResources unfiltered =
        new AndroidResources(unfilteredResources, getResourceRoots(unfilteredResources));
    assertFilter(unfiltered, filteredResources, isDependency);
  }

  private Optional<? extends AndroidResources> assertFilter(
      AndroidResources unfiltered, ImmutableList<Artifact> filteredResources, boolean isDependency)
      throws Exception {

    ImmutableList.Builder<Artifact> filteredDepsBuilder = ImmutableList.builder();

    ResourceFilter fakeFilter =
        ResourceFilter.of(ImmutableSet.copyOf(filteredResources), filteredDepsBuilder::add);

    Optional<? extends AndroidResources> filtered =
        unfiltered.maybeFilter(errorConsumer, fakeFilter, isDependency);

    if (filteredResources.equals(unfiltered.getResources())) {
      // We expect filtering to have been a no-op
      assertThat(filtered.isPresent()).isFalse();
    } else {
      // The resources and their roots should be filtered
      assertThat(filtered.get().getResources())
          .containsExactlyElementsIn(filteredResources)
          .inOrder();
      assertThat(filtered.get().getResourceRoots())
          .containsExactlyElementsIn(getResourceRoots(filteredResources))
          .inOrder();
    }

    if (!isDependency) {
      // The filter should not record any filtered dependencies
      assertThat(filteredDepsBuilder.build()).isEmpty();
    } else {
      // The filtered dependencies should be exactly the list of filtered resources
      assertThat(unfiltered.getResources())
          .containsExactlyElementsIn(
              Iterables.concat(filteredDepsBuilder.build(), filteredResources));
    }

    return filtered;
  }

  @Test
  public void testParseNoCompile() throws Exception {
    useConfiguration("--android_aapt=aapt");

    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ true);
    ParsedAndroidResources parsed = assertParse(ruleContext);

    // Since we are not using aapt2, there should be no compiled symbols
    assertThat(parsed.getCompiledSymbols()).isNull();

    // The parse action should take resources in and output symbols
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ parsed.getResources(),
        /* outputs = */ ImmutableList.of(parsed.getSymbols()));
  }

  @Test
  public void testParseAndCompile() throws Exception {
    mockAndroidSdkWithAapt2();
    useConfiguration("--android_sdk=//sdk:sdk", "--android_aapt=aapt2");

    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ false);
    ParsedAndroidResources parsed = assertParse(ruleContext);

    assertThat(parsed.getCompiledSymbols()).isNotNull();

    // The parse action should take resources in and output symbols
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ parsed.getResources(),
        /* outputs = */ ImmutableList.of(parsed.getSymbols()));

    // Since there was no data binding, the compile action should just take in resources and output
    // compiled symbols.
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ parsed.getResources(),
        /* outputs = */ ImmutableList.of(parsed.getCompiledSymbols()));
  }

  @Test
  public void testParseWithDataBinding() throws Exception {
    mockAndroidSdkWithAapt2();
    useConfiguration("--android_sdk=//sdk:sdk", "--android_aapt=aapt2");

    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ true);

    ParsedAndroidResources parsed = assertParse(ruleContext);

    // The parse action should take resources and busybox artifacts in and output symbols
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ parsed.getResources(),
        /* outputs = */ ImmutableList.of(parsed.getSymbols()));

    // The compile action should take in resources and manifest in and output compiled symbols and
    // an unused data binding zip.
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.<Artifact>builder()
            .addAll(parsed.getResources())
            .add(parsed.getManifest())
            .build(),
        /* outputs = */ ImmutableList.of(
            parsed.getCompiledSymbols(), DataBinding.getSuffixedInfoFile(ruleContext, "_unused")));
  }

  @Test
  public void testMergeDataBinding() throws Exception {
    useConfiguration("--android_aapt=aapt");

    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ true);
    ParsedAndroidResources parsed = assertParse(ruleContext);
    MergedAndroidResources merged = parsed.merge(ruleContext, /* neverlink = */ false);

    // Besides processed manifest, inherited values should be equal
    assertThat(parsed).isEqualTo(new ParsedAndroidResources(merged, parsed.getStampedManifest()));

    // There should be a new processed manifest
    assertThat(merged.getManifest()).isNotEqualTo(parsed.getManifest());

    assertThat(merged.getDataBindingInfoZip()).isNotNull();

    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.<Artifact>builder()
            .addAll(merged.getResources())
            .add(merged.getSymbols())
            .add(parsed.getManifest())
            .build(),
        /* outputs = */ ImmutableList.of(
            merged.getMergedResources(),
            merged.getClassJar(),
            merged.getDataBindingInfoZip(),
            merged.getManifest()));
  }

  @Test
  public void testMergeCompiled() throws Exception {
    mockAndroidSdkWithAapt2();
    useConfiguration(
        "--android_sdk=//sdk:sdk", "--android_aapt=aapt2", "--experimental_skip_parsing_action");

    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ false);
    ParsedAndroidResources parsed = assertParse(ruleContext);
    MergedAndroidResources merged = parsed.merge(ruleContext, /* neverlink = */ false);

    // Besides processed manifest, inherited values should be equal
    assertThat(parsed).isEqualTo(new ParsedAndroidResources(merged, parsed.getStampedManifest()));

    // There should be a new processed manifest
    assertThat(merged.getManifest()).isNotEqualTo(parsed.getManifest());

    assertThat(merged.getDataBindingInfoZip()).isNull();
    assertThat(merged.getCompiledSymbols()).isNotNull();

    // We use the compiled symbols file to build the resource class jar
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.<Artifact>builder()
            .addAll(merged.getResources())
            .add(merged.getCompiledSymbols())
            .add(parsed.getManifest())
            .build(),
        /* outputs = */ ImmutableList.of(merged.getClassJar(), merged.getManifest()));

    // The old symbols file is still needed to build the merged resources zip
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.<Artifact>builder()
            .addAll(merged.getResources())
            .add(merged.getSymbols())
            .add(parsed.getManifest())
            .build(),
        /* outputs = */ ImmutableList.of(merged.getMergedResources()));
  }

  @Test
  public void testValidateAapt() throws Exception {
    useConfiguration("--android_aapt=aapt");
    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ false);

    MergedAndroidResources merged = makeMergedResources(ruleContext);
    ValidatedAndroidResources validated = merged.validate(ruleContext);

    // Inherited values should be equal
    assertThat(merged).isEqualTo(new MergedAndroidResources(validated));

    // aapt artifacts should be generated
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.of(validated.getMergedResources(), validated.getManifest()),
        /* outputs = */ ImmutableList.of(
            validated.getRTxt(), validated.getJavaSourceJar(), validated.getApk()));

    // aapt2 artifacts should not be generated
    assertThat(validated.getCompiledSymbols()).isNull();
    assertThat(validated.getAapt2RTxt()).isNull();
    assertThat(validated.getAapt2SourceJar()).isNull();
    assertThat(validated.getStaticLibrary()).isNull();
  }

  @Test
  public void testValidateAapt2() throws Exception {
    mockAndroidSdkWithAapt2();
    useConfiguration("--android_sdk=//sdk:sdk", "--android_aapt=aapt2");
    RuleContext ruleContext = getRuleContext(/* useDataBinding = */ false);

    MergedAndroidResources merged = makeMergedResources(ruleContext);
    ValidatedAndroidResources validated = merged.validate(ruleContext);

    // Inherited values should be equal
    assertThat(merged).isEqualTo(new MergedAndroidResources(validated));

    // aapt artifacts should be generated
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.of(validated.getMergedResources(), validated.getManifest()),
        /* outputs = */ ImmutableList.of(
            validated.getRTxt(), validated.getJavaSourceJar(), validated.getApk()));

    // aapt2 artifacts should be recorded
    assertThat(validated.getCompiledSymbols()).isNotNull();
    assertThat(validated.getAapt2RTxt()).isNotNull();
    assertThat(validated.getAapt2SourceJar()).isNotNull();
    assertThat(validated.getStaticLibrary()).isNotNull();

    // Compile the resources into compiled symbols files
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ validated.getResources(),
        /* outputs = */ ImmutableList.of(validated.getCompiledSymbols()));

    // Use the compiled symbols and manifest to build aapt2 packaging outputs
    assertActionArtifacts(
        ruleContext,
        /* inputs = */ ImmutableList.of(validated.getCompiledSymbols(), validated.getManifest()),
        /* outputs = */ ImmutableList.of(
            validated.getAapt2RTxt(), validated.getAapt2SourceJar(), validated.getStaticLibrary()));
  }

  /**
   * Validates that a parse action was invoked correctly. Returns the {@link ParsedAndroidResources}
   * for further validation.
   */
  private ParsedAndroidResources assertParse(RuleContext ruleContext) throws Exception {
    ImmutableList<Artifact> resources = getResources("values-en/foo.xml", "drawable-hdpi/bar.png");
    AndroidResources raw =
        new AndroidResources(
            resources, AndroidResources.getResourceRoots(ruleContext, resources, "resource_files"));
    StampedAndroidManifest manifest = getManifest();

    ParsedAndroidResources parsed = raw.parse(ruleContext, manifest);

    // Inherited values should be equal
    assertThat(raw).isEqualTo(new AndroidResources(parsed));

    // Label should be set from RuleContext
    assertThat(parsed.getLabel()).isEqualTo(ruleContext.getLabel());

    return parsed;
  }

  private MergedAndroidResources makeMergedResources(RuleContext ruleContext)
      throws RuleErrorException, InterruptedException {
    ImmutableList<Artifact> resources = getResources("values-en/foo.xml", "drawable-hdpi/bar.png");
    return new AndroidResources(
            resources, AndroidResources.getResourceRoots(ruleContext, resources, "resource_files"))
        .parse(ruleContext, getManifest())
        .merge(ruleContext, /* neverlink = */ true);
  }

  private StampedAndroidManifest getManifest() {
    return new StampedAndroidManifest(
        getResource("some/path/AndroidManifest.xml"), "some.java.pkg", /* exported = */ true);
  }

  /** Gets a dummy rule context object by creating a dummy target. */
  private RuleContext getRuleContext(boolean useDataBinding) throws Exception {
    ConfiguredTarget target =
        scratchConfiguredTarget(
            "java/foo",
            "target",
            "android_library(name = 'target',",
            useDataBinding ? "  enable_data_binding = True" : "",
            ")");
    return getRuleContextForActionTesting(target);
  }
}