/*
 * Copyright 2012-present Facebook, Inc.
 *
 * 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.facebook.buck.android;

import static com.facebook.buck.util.BuckConstant.GEN_DIR;
import static com.facebook.buck.util.BuckConstant.GEN_PATH;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import com.facebook.buck.event.BuckEventBusFactory;
import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.java.JavaLibraryBuilder;
import com.facebook.buck.java.JavaPackageFinder;
import com.facebook.buck.java.Keystore;
import com.facebook.buck.java.KeystoreBuilder;
import com.facebook.buck.model.BuildId;
import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.model.BuildTargetFactory;
import com.facebook.buck.parser.BuildTargetParser;
import com.facebook.buck.parser.BuildTargetPatternParser;
import com.facebook.buck.parser.NoSuchBuildTargetException;
import com.facebook.buck.rules.ActionGraph;
import com.facebook.buck.rules.ArtifactCache;
import com.facebook.buck.rules.BuildContext;
import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.BuildRuleParams;
import com.facebook.buck.rules.BuildRuleResolver;
import com.facebook.buck.rules.BuildRuleType;
import com.facebook.buck.rules.ExopackageInfo;
import com.facebook.buck.rules.FakeBuildRule;
import com.facebook.buck.rules.FakeBuildRuleParamsBuilder;
import com.facebook.buck.rules.FakeBuildableContext;
import com.facebook.buck.rules.ImmutableBuildContext;
import com.facebook.buck.rules.InstallableApk;
import com.facebook.buck.rules.PathSourcePath;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.SourcePathResolver;
import com.facebook.buck.rules.TestSourcePath;
import com.facebook.buck.shell.ShellStep;
import com.facebook.buck.step.ExecutionContext;
import com.facebook.buck.step.Step;
import com.facebook.buck.step.StepRunner;
import com.facebook.buck.step.TestExecutionContext;
import com.facebook.buck.step.fs.MakeCleanDirectoryStep;
import com.facebook.buck.step.fs.MkdirAndSymlinkFileStep;
import com.facebook.buck.step.fs.MkdirStep;
import com.facebook.buck.step.fs.RmStep;
import com.facebook.buck.testutil.FakeProjectFilesystem;
import com.facebook.buck.testutil.MoreAsserts;
import com.facebook.buck.timing.Clock;
import com.facebook.buck.util.environment.Platform;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Optional;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;

import org.easymock.EasyMock;
import org.junit.Test;

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

/**
 * Unit test for {@link com.facebook.buck.android.ApkGenrule}.
 */
public class ApkGenruleTest {

  private static final Function<Path, Path> relativeToAbsolutePathFunction =
      new Function<Path, Path>() {
        @Override
        public Path apply(Path path) {
          return Paths.get("/opt/local/fbandroid").resolve(path);
        }
      };

  private void createSampleAndroidBinaryRule(BuildRuleResolver ruleResolver) {
    // Create a java_binary that depends on a java_library so it is possible to create a
    // java_binary rule with a classpath entry and a main class.
    BuildTarget libAndroidTarget = BuildTargetFactory.newInstance("//:lib-android");
    BuildRule androidLibRule = JavaLibraryBuilder.createBuilder(libAndroidTarget)
        .addSrc(Paths.get("java/com/facebook/util/Facebook.java"))
        .build(ruleResolver);

    BuildTarget keystoreTarget = BuildTargetFactory.newInstance("//keystore:debug");
    Keystore keystore = (Keystore) KeystoreBuilder.createBuilder(keystoreTarget)
        .setStore(Paths.get("keystore/debug.keystore"))
        .setProperties(Paths.get("keystore/debug.keystore.properties"))
        .build(ruleResolver);

    AndroidBinaryBuilder.createBuilder(BuildTargetFactory.newInstance("//:fb4a"))
        .setManifest(new TestSourcePath("AndroidManifest.xml"))
        .setTarget("Google Inc.:Google APIs:16")
        .setOriginalDeps(ImmutableSortedSet.of(androidLibRule.getBuildTarget()))
        .setKeystore(keystore.getBuildTarget())
        .build(ruleResolver);
  }

  @Test
  @SuppressWarnings("PMD.AvoidUsingHardCodedIP")
  public void testCreateAndRunApkGenrule() throws IOException, NoSuchBuildTargetException {
    ProjectFilesystem projectFilesystem = new FakeProjectFilesystem();
    BuildRuleResolver ruleResolver = new BuildRuleResolver();
    createSampleAndroidBinaryRule(ruleResolver);

    // From the Python object, create a ApkGenruleBuildRuleFactory to create a ApkGenrule.Builder
    // that builds a ApkGenrule from the Python object.
    BuildTargetParser parser = EasyMock.createNiceMock(BuildTargetParser.class);
    final BuildTarget apkTarget = BuildTargetFactory.newInstance("//:fb4a");
    EasyMock.expect(
        parser.parse(EasyMock.eq(":fb4a"),
            EasyMock.anyObject(BuildTargetPatternParser.class)))
        .andStubReturn(apkTarget);
    EasyMock.replay(parser);

    BuildTarget buildTarget = BuildTarget.builder("//src/com/facebook", "sign_fb4a").build();
    ApkGenruleDescription description = new ApkGenruleDescription();
    ApkGenruleDescription.Arg arg = description.createUnpopulatedConstructorArg();
    arg.apk = new FakeInstallable(
        AndroidBinaryDescription.TYPE,
        apkTarget,
        new SourcePathResolver(ruleResolver)).getBuildTarget();
    arg.bash = Optional.of("");
    arg.cmd = Optional.of("python signer.py $APK key.properties > $OUT");
    arg.cmdExe = Optional.of("");
    arg.out = "signed_fb4a.apk";
    arg.srcs = Optional.of(ImmutableList.<SourcePath>of(
        new PathSourcePath(projectFilesystem, Paths.get("src/com/facebook/signer.py")),
        new PathSourcePath(projectFilesystem, Paths.get("src/com/facebook/key.properties"))));
    BuildRuleParams params = new FakeBuildRuleParamsBuilder(buildTarget)
        .setProjectFilesystem(
            new ProjectFilesystem(Paths.get(".")) {
              @Override
              public Function<Path, Path> getAbsolutifier() {
                return relativeToAbsolutePathFunction;
              }
            }).build();
    ApkGenrule apkGenrule = description.createBuildRule(params, ruleResolver, arg);
    ruleResolver.addToIndex(apkGenrule);

    // Verify all of the observers of the Genrule.
    String expectedApkOutput =
        "/opt/local/fbandroid/" + GEN_DIR + "/src/com/facebook/sign_fb4a.apk";
    assertEquals(expectedApkOutput,
        apkGenrule.getAbsoluteOutputFilePath());
    assertEquals(
        "The apk that this rule is modifying must have the apk in its deps.",
        ImmutableSet.of(apkTarget.toString()),
        FluentIterable
            .from(apkGenrule.getDeps())
            .transform(Functions.toStringFunction())
            .toSet());
    BuildContext buildContext = ImmutableBuildContext.builder()
        .setActionGraph(EasyMock.createMock(ActionGraph.class))
        .setStepRunner(EasyMock.createNiceMock(StepRunner.class))
        .setProjectFilesystem(EasyMock.createNiceMock(ProjectFilesystem.class))
        .setClock(EasyMock.createMock(Clock.class))
        .setBuildId(EasyMock.createMock(BuildId.class))
        .setArtifactCache(EasyMock.createMock(ArtifactCache.class))
        .setJavaPackageFinder(EasyMock.createNiceMock(JavaPackageFinder.class))
        .setEventBus(BuckEventBusFactory.newInstance())
        .build();
    Iterable<Path> expectedInputsToCompareToOutputs = ImmutableList.of(
        Paths.get("src/com/facebook/signer.py"),
        Paths.get("src/com/facebook/key.properties"));
    MoreAsserts.assertIterablesEquals(
        expectedInputsToCompareToOutputs,
        apkGenrule.getInputsToCompareToOutput());

    // Verify that the shell commands that the genrule produces are correct.
    List<Step> steps = apkGenrule.getBuildSteps(buildContext, new FakeBuildableContext());
    assertEquals(7, steps.size());

    Step firstStep = steps.get(0);
    assertTrue(firstStep instanceof RmStep);
    RmStep rmCommand = (RmStep) firstStep;
    ExecutionContext executionContext = newEmptyExecutionContext();
    assertEquals(
        "First command should delete the output file to be written by the genrule.",
        ImmutableList.of(
            "rm",
            "-f",
            apkGenrule.getPathToOutputFile().toString()),
        rmCommand.getShellCommand(executionContext));

    Step secondStep = steps.get(1);
    assertTrue(secondStep instanceof MkdirStep);
    MkdirStep mkdirCommand = (MkdirStep) secondStep;
    assertEquals(
        "Second command should make sure the output directory exists.",
        Paths.get(GEN_DIR + "/src/com/facebook/"),
        mkdirCommand.getPath(executionContext));

    Step thirdStep = steps.get(2);
    assertTrue(thirdStep instanceof MakeCleanDirectoryStep);
    MakeCleanDirectoryStep secondMkdirCommand = (MakeCleanDirectoryStep) thirdStep;
    Path relativePathToTmpDir = GEN_PATH.resolve("src/com/facebook/sign_fb4a__tmp");
    assertEquals(
        "Third command should make sure the temp directory exists.",
        relativePathToTmpDir,
        secondMkdirCommand.getPath());

    Step fourthStep = steps.get(3);
    assertTrue(fourthStep instanceof MakeCleanDirectoryStep);
    MakeCleanDirectoryStep thirdMkdirCommand = (MakeCleanDirectoryStep) fourthStep;
    Path relativePathToSrcDir = GEN_PATH.resolve("src/com/facebook/sign_fb4a__srcs");
    assertEquals(
        "Fourth command should make sure the temp directory exists.",
        relativePathToSrcDir,
        thirdMkdirCommand.getPath());

    MkdirAndSymlinkFileStep linkSource1 = (MkdirAndSymlinkFileStep) steps.get(4);
    assertEquals(Paths.get("src/com/facebook/signer.py"), linkSource1.getSource());
    assertEquals(Paths.get(relativePathToSrcDir + "/signer.py"), linkSource1.getTarget());

    MkdirAndSymlinkFileStep linkSource2 = (MkdirAndSymlinkFileStep) steps.get(5);
    assertEquals(Paths.get("src/com/facebook/key.properties"), linkSource2.getSource());
    assertEquals(Paths.get(relativePathToSrcDir + "/key.properties"), linkSource2.getTarget());

    Step seventhStep = steps.get(6);
    assertTrue(seventhStep instanceof ShellStep);
    ShellStep genruleCommand = (ShellStep) seventhStep;
    assertEquals("genrule", genruleCommand.getShortName());
    ImmutableMap<String, String> environmentVariables = genruleCommand.getEnvironmentVariables(
        executionContext);
    assertEquals(new ImmutableMap.Builder<String, String>()
        .put("APK", relativeToAbsolutePathFunction.apply(GEN_PATH.resolve("fb4a.apk")).toString())
        .put("OUT", expectedApkOutput).build(),
        environmentVariables);
    assertEquals(
        ImmutableList.of("/bin/bash", "-e", "-c", "python signer.py $APK key.properties > $OUT"),
        genruleCommand.getShellCommand(executionContext));

    EasyMock.verify(parser);
  }

  private ExecutionContext newEmptyExecutionContext() {
    return TestExecutionContext.newBuilder()
        .setPlatform(Platform.LINUX) // Fix platform to Linux to use bash in genrule.
        .build();
  }

  private static class FakeInstallable extends FakeBuildRule implements InstallableApk {

    public FakeInstallable(
        BuildRuleType type,
        BuildTarget buildTarget,
        SourcePathResolver resolver) {
      super(type, buildTarget, resolver);
    }

    @Override
    public Path getManifestPath() {
      return Paths.get("spoof");
    }

    @Override
    public Path getApkPath() {
      return Paths.get("buck-out/gen/fb4a.apk");
    }

    @Override
    public Optional<ExopackageInfo> getExopackageInfo() {
      return Optional.absent();
    }
  }
}