// 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.config;

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

import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.testutil.TestRuleClassProvider;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for the config_feature_flag rule. */
@RunWith(JUnit4.class)
public final class ConfigFeatureFlagNamingTest extends BuildViewTestCase {

  private String getMnemonic(ConfiguredTarget target) {
    return getConfiguration(target).getMnemonic();
  }

  @Override
  protected ConfiguredRuleClassProvider createRuleClassProvider() {
    ConfiguredRuleClassProvider.Builder builder =
        new ConfiguredRuleClassProvider.Builder().addRuleDefinition(new FeatureFlagSetterRule());
    TestRuleClassProvider.addStandardRules(builder);
    return builder.build();
  }

  @Test
  public void featureFlagSetter_sameSettingYieldsSameMnemonic_legacy() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'top_a',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "feature_flag_setter(",
        "    name = 'top_b',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=legacy");
    String aMnemonic = getMnemonic(getConfiguredTarget("//test:top_a"));
    String bMnemonic = getMnemonic(getConfiguredTarget("//test:top_b"));
    assertThat(aMnemonic).isEqualTo(bMnemonic);
  }

  @Test
  public void featureFlagSetter_diffSettingYieldsDiffMnemonic_legacy() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'top_a',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "feature_flag_setter(",
        "    name = 'top_b',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'other',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=legacy");
    String aMnemonic = getMnemonic(getConfiguredTarget("//test:top_a"));
    String bMnemonic = getMnemonic(getConfiguredTarget("//test:top_b"));
    assertThat(aMnemonic).isNotEqualTo(bMnemonic);
  }

  @Test
  public void featureFlagSetter_sameSettingYieldsSameMnemonic_diff() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'top_a',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "feature_flag_setter(",
        "    name = 'top_b',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=diff_against_dynamic_baseline");
    String aMnemonic = getMnemonic(getConfiguredTarget("//test:top_a"));
    String bMnemonic = getMnemonic(getConfiguredTarget("//test:top_b"));
    assertThat(aMnemonic).isEqualTo(bMnemonic);
  }

  @Test
  public void featureFlagSetter_diffSettingYieldsDiffMnemonic_diff() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'top_a',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "feature_flag_setter(",
        "    name = 'top_b',",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'other',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=diff_against_dynamic_baseline");
    String aMnemonic = getMnemonic(getConfiguredTarget("//test:top_a"));
    String bMnemonic = getMnemonic(getConfiguredTarget("//test:top_b"));
    assertThat(aMnemonic).isNotEqualTo(bMnemonic);
  }

  @Test
  public void untrimmedFlag_doesNothing_legacy() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'via_setter',",
        "    deps = [':via_consumer'],",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "genrule(",
        "    name = 'via_consumer',",
        "    outs = ['out'],",
        "    cmd = 'touch $@',",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=legacy");
    ConfiguredTarget viaSetter = getConfiguredTarget("//test:via_setter");
    ConfiguredTarget viaConsumer = getDirectPrerequisite(viaSetter, "//test:via_consumer");
    assertThat(getMnemonic(viaSetter)).isEqualTo(getMnemonic(viaConsumer));
  }

  @Test
  public void trimmedFlag_causesDiff_legacy() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'via_setter',",
        "    deps = [':via_consumer'],",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "genrule(",
        "    name = 'via_consumer',",
        "    outs = ['out'],",
        "    cmd = 'touch $@',",
        "    transitive_configs = [],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=legacy");
    ConfiguredTarget viaSetter = getConfiguredTarget("//test:via_setter");
    ConfiguredTarget viaConsumer = getDirectPrerequisite(viaSetter, "//test:via_consumer");
    assertThat(getMnemonic(viaSetter)).isNotEqualTo(getMnemonic(viaConsumer));
  }

  @Test
  public void untrimmedFlag_doesNothing_diff() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'via_setter',",
        "    deps = [':via_consumer'],",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "genrule(",
        "    name = 'via_consumer',",
        "    outs = ['out'],",
        "    cmd = 'touch $@',",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=diff_against_dynamic_baseline");
    ConfiguredTarget viaSetter = getConfiguredTarget("//test:via_setter");
    ConfiguredTarget viaConsumer = getDirectPrerequisite(viaSetter, "//test:via_consumer");
    assertThat(getMnemonic(viaSetter)).isEqualTo(getMnemonic(viaConsumer));
  }

  @Test
  public void trimmedFlag_causesDiff_diff() throws Exception {
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'via_setter',",
        "    deps = [':via_consumer'],",
        "    exports_flag = ':flag',",
        "    flag_values = {",
        "        ':flag': 'configured',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "genrule(",
        "    name = 'via_consumer',",
        "    outs = ['out'],",
        "    cmd = 'touch $@',",
        "    transitive_configs = [],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'configured', 'other'],",
        "    default_value = 'default',",
        ")");
    useConfiguration(
        "--enforce_transitive_configs_for_config_feature_flag",
        "--experimental_output_directory_naming_scheme=diff_against_dynamic_baseline");
    ConfiguredTarget viaSetter = getConfiguredTarget("//test:via_setter");
    ConfiguredTarget viaConsumer = getDirectPrerequisite(viaSetter, "//test:via_consumer");
    assertThat(getMnemonic(viaSetter)).isNotEqualTo(getMnemonic(viaConsumer));
  }
}