// Copyright 2021 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.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.config.CoreOptions;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.packages.util.MockCcSupport;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@code CcToolchainInputsTransitionFactory}. */
@RunWith(JUnit4.class)
public class CcToolchainInputsTransitionFactoryTest extends BuildViewTestCase {

  @Test
  public void testExecTransitionForInputsDisabled_usesTargetPlatform() throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "    name = 'all_files',",
        "    srcs = ['a.txt'],",
        ")",
        "cc_toolchain(",
        "    name = 'toolchain',",
        "    all_files = ':all_files',",
        "    ar_files = ':all_files',",
        "    as_files = ':all_files',",
        "    compiler_files = ':all_files',",
        "    compiler_files_without_includes = ':all_files',",
        "    dwp_files = ':all_files',",
        "    linker_files = ':all_files',",
        "    strip_files = ':all_files',",
        "    objcopy_files = ':all_files',",
        "    toolchain_identifier = 'does-not-matter',",
        "    toolchain_config = ':does-not-matter-config',",
        "    exec_transition_for_inputs = False,",
        ")",
        "cc_toolchain_config(name = 'does-not-matter-config')");

    scratch.file("a/cc_toolchain_config.bzl", MockCcSupport.EMPTY_CC_TOOLCHAIN);

    ConfiguredTarget toolchainTarget = getConfiguredTarget("//a:toolchain");
    assertThat(toolchainTarget).isNotNull();

    ConfiguredTarget allFiles = getDirectPrerequisite(toolchainTarget, "//a:all_files");
    assertThat(allFiles).isNotNull();

    CoreOptions coreOptions = getConfiguration(allFiles).getOptions().get(CoreOptions.class);
    assertThat(coreOptions).isNotNull();
    assertThat(coreOptions.isHost).isFalse();
    assertThat(coreOptions.isExec).isFalse();
    // if isHost and isExec are false, then allFiles is building for the target platform
  }

  @Test
  public void testExecTransitionForInputsEnabled_usesExecPlatform() throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "    name = 'all_files',",
        "    srcs = ['a.txt'],",
        ")",
        "cc_toolchain(",
        "    name = 'toolchain',",
        "    all_files = ':all_files',",
        "    ar_files = ':all_files',",
        "    as_files = ':all_files',",
        "    compiler_files = ':all_files',",
        "    compiler_files_without_includes = ':all_files',",
        "    dwp_files = ':all_files',",
        "    linker_files = ':all_files',",
        "    strip_files = ':all_files',",
        "    objcopy_files = ':all_files',",
        "    toolchain_identifier = 'does-not-matter',",
        "    toolchain_config = ':does-not-matter-config',",
        "    exec_transition_for_inputs = True,",
        ")",
        "cc_toolchain_config(name = 'does-not-matter-config')");

    scratch.file("a/cc_toolchain_config.bzl", MockCcSupport.EMPTY_CC_TOOLCHAIN);

    ConfiguredTarget toolchainTarget = getConfiguredTarget("//a:toolchain");
    assertThat(toolchainTarget).isNotNull();

    ConfiguredTarget allFiles = getDirectPrerequisite(toolchainTarget, "//a:all_files");
    assertThat(allFiles).isNotNull();

    CoreOptions coreOptions = getConfiguration(allFiles).getOptions().get(CoreOptions.class);
    assertThat(coreOptions).isNotNull();
    assertThat(coreOptions.isHost).isFalse();
    assertThat(coreOptions.isExec).isTrue();
  }

  @Test
  public void testExecTransitionForInputsDefault_usesExecPlatform() throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "    name = 'all_files',",
        "    srcs = ['a.txt'],",
        ")",
        "cc_toolchain(",
        "    name = 'toolchain',",
        "    all_files = ':all_files',",
        "    ar_files = ':all_files',",
        "    as_files = ':all_files',",
        "    compiler_files = ':all_files',",
        "    compiler_files_without_includes = ':all_files',",
        "    dwp_files = ':all_files',",
        "    linker_files = ':all_files',",
        "    strip_files = ':all_files',",
        "    objcopy_files = ':all_files',",
        "    toolchain_identifier = 'does-not-matter',",
        "    toolchain_config = ':does-not-matter-config',",
        ")",
        "cc_toolchain_config(name = 'does-not-matter-config')");

    scratch.file("a/cc_toolchain_config.bzl", MockCcSupport.EMPTY_CC_TOOLCHAIN);

    ConfiguredTarget toolchainTarget = getConfiguredTarget("//a:toolchain");
    assertThat(toolchainTarget).isNotNull();

    ConfiguredTarget allFiles = getDirectPrerequisite(toolchainTarget, "//a:all_files");
    assertThat(allFiles).isNotNull();

    CoreOptions coreOptions = getConfiguration(allFiles).getOptions().get(CoreOptions.class);
    assertThat(coreOptions).isNotNull();
    assertThat(coreOptions.isHost).isFalse();
    assertThat(coreOptions.isExec).isTrue();
  }
}