// 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.cpp;

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

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget;
import com.google.devtools.build.lib.analysis.util.AnalysisMock;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.packages.util.Crosstool.CcToolchainConfig;
import com.google.devtools.build.lib.packages.util.MockPlatformSupport;
import com.google.devtools.build.lib.vfs.ModifiedFileSet;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.Root;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests that {@code CppCompileAction} is populated with the correct build variables. */
@RunWith(JUnit4.class)
public class CompileBuildVariablesTest extends BuildViewTestCase {

  private CppCompileAction getCppCompileAction(ConfiguredTarget target, final String name)
      throws Exception {
    return (CppCompileAction)
        getGeneratingAction(
            Iterables.find(
                getGeneratingAction(getFilesToBuild(target).getSingleton()).getInputs().toList(),
                (artifact) -> artifact.getExecPath().getBaseName().startsWith(name)));
  }

  /** Returns active build variables for a compile action of given type for given target. */
  protected CcToolchainVariables getCompileBuildVariables(String label, String name)
      throws Exception {
    return getCppCompileAction(getConfiguredTarget(label), name)
        .getCompileCommandLine()
        .getVariables();
  }

  @Test
  public void testPresenceOfBasicVariables() throws Exception {
    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(variables.getStringVariable(CompileBuildVariables.SOURCE_FILE.getVariableName()))
        .contains("x/bin.cc");
    assertThat(variables.getStringVariable(CompileBuildVariables.OUTPUT_FILE.getVariableName()))
        .contains("_objs/bin/bin");
  }

  @Test
  public void testPresenceOfConfigurationCompileFlags() throws Exception {
    useConfiguration("--copt=-foo");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'], copts = ['-bar'],)");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    ImmutableList<String> userCopts =
        CcToolchainVariables.toStringList(
            variables, CompileBuildVariables.USER_COMPILE_FLAGS.getVariableName());
    assertThat(userCopts)
        .containsAtLeastElementsIn(ImmutableList.<String>of("-foo", "-bar"))
        .inOrder();
  }

  @Test
  public void testPresenceOfUserCompileFlags() throws Exception {
    useConfiguration();

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'], copts = ['-foo'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    ImmutableList<String> copts =
        CcToolchainVariables.toStringList(
            variables, CompileBuildVariables.USER_COMPILE_FLAGS.getVariableName());
    assertThat(copts).contains("-foo");
  }

  @Test
  public void testPerFileCoptsAreInUserCompileFlags() throws Exception {
    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");
    useConfiguration(
        "--per_file_copt=//x:bin@-foo",
        "--per_file_copt=//x:bar\\.cc@-bar",
        "--host_per_file_copt=//x:bin@-baz");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    ImmutableList<String> copts =
        CcToolchainVariables.toStringList(
            variables, CompileBuildVariables.USER_COMPILE_FLAGS.getVariableName());
    assertThat(copts).containsExactly("-foo").inOrder();
  }

  @Test
  public void testHostPerFileCoptsAreInUserCompileFlags() throws Exception {
    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");
    useConfiguration(
        "--host_per_file_copt=//x:bin@-foo",
        "--host_per_file_copt=//x:bar\\.cc@-bar",
        "--per_file_copt=//x:bin@-baz");

    ConfiguredTarget target = getConfiguredTarget("//x:bin", getHostConfiguration());
    CcToolchainVariables variables =
        getCppCompileAction(target, "bin").getCompileCommandLine().getVariables();

    ImmutableList<String> copts =
        CcToolchainVariables.toStringList(
            variables, CompileBuildVariables.USER_COMPILE_FLAGS.getVariableName());
    assertThat(copts).contains("-foo");
    assertThat(copts).doesNotContain("-bar");
    assertThat(copts).doesNotContain("-baz");
  }

  @Test
  public void testPresenceOfSysrootBuildVariable() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig, CcToolchainConfig.builder().withSysroot("/usr/local/custom-sysroot"));
    useConfiguration();

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(variables.getStringVariable(CcCommon.SYSROOT_VARIABLE_NAME))
        .isEqualTo("/usr/local/custom-sysroot");
  }

  @Test
  public void testTargetSysrootWithoutPlatforms() throws Exception {
    useConfiguration(
        "--grte_top=//target_libc",
        "--host_grte_top=//host_libc",
        "--noincompatible_enable_cc_toolchain_resolution");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");
    scratch.file("target_libc/BUILD", "filegroup(name = 'everything')");
    scratch.file("host_libc/BUILD", "filegroup(name = 'everything')");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(variables.getStringVariable(CcCommon.SYSROOT_VARIABLE_NAME))
        .isEqualTo("target_libc");
  }

  @Test
  public void testTargetSysrootWithPlatforms() throws Exception {
    MockPlatformSupport.addMockK8Platform(
        mockToolsConfig, analysisMock.ccSupport().getMockCrosstoolLabel());
    useConfiguration(
        "--experimental_platforms=//mock_platform:mock-k8-platform",
        "--extra_toolchains=//mock_platform:toolchain_cc-compiler-k8",
        "--incompatible_enable_cc_toolchain_resolution",
        "--grte_top=//target_libc",
        "--host_grte_top=//host_libc");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");
    scratch.file("target_libc/BUILD", "filegroup(name = 'everything')");
    scratch.file("host_libc/BUILD", "filegroup(name = 'everything')");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(variables.getStringVariable(CcCommon.SYSROOT_VARIABLE_NAME))
        .isEqualTo("target_libc");
  }

  @Test
  public void testPresenceOfPerObjectDebugFileBuildVariable() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig,
            CcToolchainConfig.builder().withFeatures(CppRuleClasses.PER_OBJECT_DEBUG_INFO));
    useConfiguration("--fission=yes");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(
            variables.getStringVariable(
                CompileBuildVariables.PER_OBJECT_DEBUG_INFO_FILE.getVariableName()))
        .isNotNull();
  }

  @Test
  public void testPresenceOfIsUsingFissionVariable() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig,
            CcToolchainConfig.builder().withFeatures(CppRuleClasses.PER_OBJECT_DEBUG_INFO));
    useConfiguration("--fission=yes");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(
            variables.getStringVariable(CompileBuildVariables.IS_USING_FISSION.getVariableName()))
        .isNotNull();
  }

  @Test
  public void testPresenceOfIsUsingFissionAndPerDebugObjectFileVariablesWithThinlto()
      throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig,
            CcToolchainConfig.builder()
                .withFeatures(
                    "fission_flags_for_lto_backend",
                    CppRuleClasses.PER_OBJECT_DEBUG_INFO,
                    CppRuleClasses.SUPPORTS_START_END_LIB,
                    CppRuleClasses.THIN_LTO));
    useConfiguration("--fission=yes", "--features=thin_lto");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    RuleConfiguredTarget target = (RuleConfiguredTarget) getConfiguredTarget("//x:bin");
    LtoBackendAction backendAction =
        (LtoBackendAction)
            target.getActions().stream()
                .filter(a -> a.getMnemonic().equals("CcLtoBackendCompile"))
                .findFirst()
                .get();
    CppCompileAction bitcodeAction =
        (CppCompileAction)
            target.getActions().stream()
                .filter(a -> a.getMnemonic().equals("CppCompile"))
                .findFirst()
                .get();

    // We don't pass per_object_debug_info_file to bitcode compiles
    assertThat(
            bitcodeAction
                .getCompileCommandLine()
                .getVariables()
                .isAvailable(CompileBuildVariables.IS_USING_FISSION.getVariableName()))
        .isTrue();
    assertThat(
            bitcodeAction
                .getCompileCommandLine()
                .getVariables()
                .isAvailable(CompileBuildVariables.PER_OBJECT_DEBUG_INFO_FILE.getVariableName()))
        .isFalse();

    // We do pass per_object_debug_info_file to backend compiles
    assertThat(backendAction.getArguments()).contains("-<PER_OBJECT_DEBUG_INFO_FILE>");
    assertThat(backendAction.getArguments()).contains("-<IS_USING_FISSION>");
  }

  @Test
  public void testPresenceOfPerObjectDebugFileBuildVariableUsingLegacyFields() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig,
            CcToolchainConfig.builder().withFeatures(CppRuleClasses.PER_OBJECT_DEBUG_INFO));
    useConfiguration("--fission=yes");

    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    assertThat(
            variables.getStringVariable(
                CompileBuildVariables.PER_OBJECT_DEBUG_INFO_FILE.getVariableName()))
        .isNotNull();
  }

  @Test
  public void testPresenceOfMinOsVersionBuildVariable() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig, CcToolchainConfig.builder().withFeatures("min_os_version_flag"));
    useConfiguration("--minimum_os_version=6");
    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
    scratch.file("x/bin.cc");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");
    assertThat(variables.getStringVariable(CcCommon.MINIMUM_OS_VERSION_VARIABLE_NAME))
        .isEqualTo("6");
  }

  @Test
  public void testExternalIncludePathsVariable() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig,
            CcToolchainConfig.builder().withFeatures(CppRuleClasses.EXTERNAL_INCLUDE_PATHS));
    useConfiguration("--features=external_include_paths");
    scratch.appendFile("WORKSPACE", "local_repository(", "    name = 'pkg',", "    path = '/foo')");
    getSkyframeExecutor()
        .invalidateFilesUnderPathForTesting(
            reporter,
            new ModifiedFileSet.Builder().modify(PathFragment.create("WORKSPACE")).build(),
            Root.fromPath(rootDirectory));

    scratch.file("/foo/WORKSPACE", "workspace(name = 'pkg')");
    scratch.file(
        "/foo/BUILD",
        "cc_library(name = 'foo',",
        "           hdrs = ['foo.hpp'])",
        "cc_library(name = 'foo2',",
        "           hdrs = ['foo.hpp'],",
        "           include_prefix = 'prf')");
    scratch.file(
        "x/BUILD",
        "cc_library(name = 'bar',",
        "           hdrs = ['bar.hpp'])",
        "cc_binary(name = 'bin',",
        "          srcs = ['bin.cc'],",
        "          deps = ['bar', '@pkg//:foo', '@pkg//:foo2'])");

    CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");

    ImmutableList.Builder<String> entries =
        ImmutableList.<String>builder()
            .add(
                "/k8-fastbuild/bin/external/pkg/_virtual_includes/foo2",
                "external/pkg",
                "/k8-fastbuild/bin/external/pkg");
    if (analysisMock.isThisBazel()) {
      entries.add("external/bazel_tools", "/k8-fastbuild/bin/external/bazel_tools");
    }

    assertThat(
            CcToolchainVariables.toStringList(
                    variables, CompileBuildVariables.EXTERNAL_INCLUDE_PATHS.getVariableName())
                .stream()
                .map(x -> removeOutDirectory(x))
                .collect(ImmutableList.toImmutableList()))
        .containsExactlyElementsIn(entries.build());
  }

  private String removeOutDirectory(String s) {
    return s.replace("blaze-out", "").replace("bazel-out", "");
  }
}