// 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.buildtool;

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

import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.buildtool.util.BuildIntegrationTestCase;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventCollector;
import com.google.devtools.build.lib.events.EventKind;
import com.google.devtools.build.lib.packages.util.MockGenruleSupport;
import com.google.devtools.build.lib.runtime.BlazeRuntime;
import com.google.devtools.build.lib.runtime.NoSpawnCacheModule;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.vfs.Path;
import java.io.ByteArrayOutputStream;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Test that SUBCOMMAND events report command lines in a form than can be "replayed" by copy+paste
 * to the shell.
 */
@RunWith(JUnit4.class)
public class SubcommandEventTest extends BuildIntegrationTestCase {

  @Before
  public void stageEmbeddedTools() throws Exception {
    // TODO(b/195130137): move these calls to somewhere common.
    write(
        "embedded_tools/tools/build_defs/repo/utils.bzl",
        "def maybe(repo_rule, name, **kwargs):",
        "  if name not in native.existing_rules():",
        "    repo_rule(name = name, **kwargs)");
    write("embedded_tools/tools/build_defs/repo/BUILD");
    write(
        "embedded_tools/tools/build_defs/repo/http.bzl",
        "def http_archive(**kwargs):",
        "  pass",
        "",
        "def http_file(**kwargs):",
        "  pass");

    write(
        "embedded_tools/tools/jdk/local_java_repository.bzl",
        "def local_java_repository(**kwargs):",
        "  pass");
    write(
        "embedded_tools/tools/jdk/remote_java_repository.bzl",
        "def remote_java_repository(**kwargs):",
        "  pass");
    write("embedded_tools/tools/cpp/cc_configure.bzl", "def cc_configure(**kwargs):", "  pass");

    write("embedded_tools/tools/sh/BUILD");
    write("embedded_tools/tools/sh/sh_configure.bzl", "def sh_configure(**kwargs):", "  pass");
    write("embedded_tools/tools/osx/BUILD");
    write(
        "embedded_tools/tools/osx/xcode_configure.bzl",
        "def xcode_configure(*args, **kwargs):", // no positional arguments for XCode
        "  pass");
    write("embedded_tools/bin/sh", "def sh(**kwargs):", "  pass");

    addOptions("--spawn_strategy=standalone");
  }

  @Override
  protected BlazeRuntime.Builder getRuntimeBuilder() throws Exception {
    BlazeRuntime.Builder builder = super.getRuntimeBuilder();
    builder.addBlazeModule(new NoSpawnCacheModule());
    return builder;
  }

  @Test
  public void testSubcommandEvent() throws Exception {
    MockGenruleSupport.setup(mockToolsConfig);
    EventCollector eventCollector = new EventCollector(EventKind.SUBCOMMAND);
    events.addHandler(eventCollector);
    runtimeWrapper.addOptions("--subcommands");

    write(
        "hello/BUILD",
        "genrule(name = 'hello',",
        "        outs = ['hello.out'],",
        "        cmd = 'echo \"Hello, World!\" > $(location hello.out)')");

    // (1) Ensure that building the target creates the output:
    buildTarget("//hello");
    Path helloOut = Iterables.getOnlyElement(getArtifacts("//hello:hello.out")).getPath();
    assertThat(helloOut.isFile()).isTrue();
    assertThat(helloOut.getFileSize()).isEqualTo(14);

    // (2) Delete the output:
    helloOut.delete();
    assertThat(helloOut.exists()).isFalse();

    // (3) Test that the message in the SUBCOMMAND event replays the action:
    String command = null;
    for (Event event : eventCollector) {
      command = event.getMessage();
      if (command.contains("World")) {
        break;
      }
    }
    assertThat(
            new Command(new String[] {"/bin/sh", "-c", command})
                .execute(new ByteArrayOutputStream(), new ByteArrayOutputStream())
                .getTerminationStatus()
                .success())
        .isTrue();
    assertThat(helloOut.isFile()).isTrue();
    assertThat(helloOut.getFileSize()).isEqualTo(14);
  }
}