// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <sstream>

#include "base/command_line.h"
#include "base/files/file_util.h"
#include "tools/gn/ninja_build_writer.h"
#include "tools/gn/pool.h"
#include "tools/gn/scheduler.h"
#include "tools/gn/switches.h"
#include "tools/gn/target.h"
#include "tools/gn/test_with_scheduler.h"
#include "tools/gn/test_with_scope.h"
#include "util/test/test.h"

using NinjaBuildWriterTest = TestWithScheduler;

class ScopedDotGNFile {
 public:
  ScopedDotGNFile(const base::FilePath& path)
      : path_(path),
        file_(path, base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE) {
    EXPECT_TRUE(file_.IsValid());
  }
  ~ScopedDotGNFile() {
    file_.Close();
    base::DeleteFile(path_, false);
  }

 private:
  base::FilePath path_;
  base::File file_;
};

TEST_F(NinjaBuildWriterTest, GetSelfInvocationCommandLine) {
  // TestWithScope sets up a config with a build dir of //out/Debug.
  TestWithScope setup;
  base::CommandLine cmd_out(base::CommandLine::NO_PROGRAM);

  // Setup sets the default root dir to ".".
  base::FilePath root(FILE_PATH_LITERAL("."));
  base::FilePath root_realpath = base::MakeAbsoluteFilePath(root);

  base::FilePath gn(FILE_PATH_LITERAL("testdot.gn"));

  // The file must exist on disk for MakeAbsoluteFilePath() to work.
  ScopedDotGNFile dot_gn(gn);
  base::FilePath gn_realpath = base::MakeAbsoluteFilePath(gn);

  // Without any parameters the self invocation should pass --root=../..
  // (from //out/Debug to //).
  setup.build_settings()->SetRootPath(root_realpath);
  cmd_out = GetSelfInvocationCommandLine(setup.build_settings());
  EXPECT_EQ("../..", cmd_out.GetSwitchValueASCII(switches::kRoot));
  EXPECT_FALSE(cmd_out.HasSwitch(switches::kDotfile));

  // If --root is . and --dotfile is foo/.gn, then --dotfile also needs
  // to to become ../../foo/.gn.
  setup.build_settings()->SetRootPath(root_realpath);
  setup.build_settings()->set_dotfile_name(gn_realpath);
  cmd_out = GetSelfInvocationCommandLine(setup.build_settings());
  EXPECT_EQ("../..", cmd_out.GetSwitchValueASCII(switches::kRoot));
  EXPECT_EQ("../../testdot.gn",
            cmd_out.GetSwitchValueASCII(switches::kDotfile));
}

TEST_F(NinjaBuildWriterTest, TwoTargets) {
  TestWithScope setup;
  Err err;

  Target target_foo(setup.settings(), Label(SourceDir("//foo/"), "bar"));
  target_foo.set_output_type(Target::ACTION);
  target_foo.action_values().set_script(SourceFile("//foo/script.py"));
  target_foo.action_values().outputs() = SubstitutionList::MakeForTest(
      "//out/Debug/out1.out", "//out/Debug/out2.out");
  target_foo.SetToolchain(setup.toolchain());
  ASSERT_TRUE(target_foo.OnResolved(&err));

  Target target_bar(setup.settings(), Label(SourceDir("//bar/"), "bar"));
  target_bar.set_output_type(Target::ACTION);
  target_bar.action_values().set_script(SourceFile("//bar/script.py"));
  target_bar.action_values().outputs() = SubstitutionList::MakeForTest(
      "//out/Debug/out3.out", "//out/Debug/out4.out");
  target_bar.SetToolchain(setup.toolchain());
  ASSERT_TRUE(target_bar.OnResolved(&err));

  // Make a secondary toolchain that references two pools.
  Label other_toolchain_label(SourceDir("//other/"), "toolchain");
  Toolchain other_toolchain(setup.settings(), other_toolchain_label);
  TestWithScope::SetupToolchain(&other_toolchain);

  Pool other_regular_pool(
      setup.settings(),
      Label(SourceDir("//other/"), "depth_pool", other_toolchain_label.dir(),
            other_toolchain_label.name()));
  other_regular_pool.set_depth(42);
  other_toolchain.GetTool(Toolchain::TYPE_LINK)
      ->set_pool(LabelPtrPair<Pool>(&other_regular_pool));

  // Make another target that uses its own pool

  Pool another_regular_pool(
      setup.settings(),
      Label(SourceDir("//another/"), "depth_pool", other_toolchain_label.dir(),
            other_toolchain_label.name()));
  another_regular_pool.set_depth(7);

  Target target_baz(setup.settings(), Label(SourceDir("//baz/"), "baz"));
  target_baz.set_output_type(Target::ACTION);
  target_baz.action_values().set_script(SourceFile("//baz/script.py"));
  target_baz.action_values().outputs() = SubstitutionList::MakeForTest(
      "//out/Debug/out5.out", "//out/Debug/out6.out");
  target_baz.SetToolchain(&other_toolchain);
  target_baz.action_values().set_pool(LabelPtrPair<Pool>(&another_regular_pool));
  ASSERT_TRUE(target_baz.OnResolved(&err));

  // The console pool must be in the default toolchain.
  Pool console_pool(setup.settings(), Label(SourceDir("//"), "console",
                                            setup.toolchain()->label().dir(),
                                            setup.toolchain()->label().name()));
  console_pool.set_depth(1);
  other_toolchain.GetTool(Toolchain::TYPE_STAMP)
      ->set_pool(LabelPtrPair<Pool>(&console_pool));

  // Settings to go with the other toolchain.
  Settings other_settings(setup.build_settings(), "toolchain/");
  other_settings.set_toolchain_label(other_toolchain_label);

  std::unordered_map<const Settings*, const Toolchain*> used_toolchains;
  used_toolchains[setup.settings()] = setup.toolchain();
  used_toolchains[&other_settings] = &other_toolchain;

  std::vector<const Target*> targets = {&target_foo, &target_bar, &target_baz};

  std::ostringstream ninja_out;
  std::ostringstream depfile_out;

  NinjaBuildWriter writer(setup.build_settings(), used_toolchains, targets,
                          setup.toolchain(), targets, ninja_out, depfile_out);
  ASSERT_TRUE(writer.Run(&err));

  const char expected_rule_gn[] = "rule gn\n";
  const char expected_build_ninja[] =
      "build build.ninja: gn\n"
      "  generator = 1\n"
      "  depfile = build.ninja.d\n";
  const char expected_other_pool[] =
      "pool other_toolchain_another_depth_pool\n"
      "  depth = 7\n"
      "\n"
      "pool other_toolchain_other_depth_pool\n"
      "  depth = 42\n";
  const char expected_toolchain[] = "subninja toolchain.ninja\n";
  const char expected_targets[] =
      "build bar: phony obj/bar/bar.stamp\n"
      "build baz: phony obj/baz/baz.stamp\n"
      "build foo$:bar: phony obj/foo/bar.stamp\n"
      "build bar$:bar: phony obj/bar/bar.stamp\n"
      "build baz$:baz: phony obj/baz/baz.stamp\n";
  const char expected_root_target[] =
      "build all: phony $\n"
      "    obj/foo/bar.stamp $\n"
      "    obj/bar/bar.stamp $\n"
      "    obj/baz/baz.stamp\n";
  const char expected_default[] = "default all\n";
  std::string out_str = ninja_out.str();
#define EXPECT_SNIPPET(expected)                       \
  EXPECT_NE(std::string::npos, out_str.find(expected)) \
      << "Expected to find: " << expected << "\n"      \
      << "Within: " << out_str
  EXPECT_SNIPPET(expected_rule_gn);
  EXPECT_SNIPPET(expected_build_ninja);
  EXPECT_SNIPPET(expected_other_pool);
  EXPECT_SNIPPET(expected_toolchain);
  EXPECT_SNIPPET(expected_targets);
  EXPECT_SNIPPET(expected_root_target);
  EXPECT_SNIPPET(expected_default);
#undef EXPECT_SNIPPET

  // A pool definition for ninja's built-in console pool must not be written.
  EXPECT_EQ(std::string::npos, out_str.find("pool console"));
}

TEST_F(NinjaBuildWriterTest, DuplicateOutputs) {
  TestWithScope setup;
  Err err;

  Target target_foo(setup.settings(), Label(SourceDir("//foo/"), "bar"));
  target_foo.set_output_type(Target::ACTION);
  target_foo.action_values().set_script(SourceFile("//foo/script.py"));
  target_foo.action_values().outputs() = SubstitutionList::MakeForTest(
      "//out/Debug/out1.out", "//out/Debug/out2.out");
  target_foo.SetToolchain(setup.toolchain());
  ASSERT_TRUE(target_foo.OnResolved(&err));

  Target target_bar(setup.settings(), Label(SourceDir("//bar/"), "bar"));
  target_bar.set_output_type(Target::ACTION);
  target_bar.action_values().set_script(SourceFile("//bar/script.py"));
  target_bar.action_values().outputs() = SubstitutionList::MakeForTest(
      "//out/Debug/out3.out", "//out/Debug/out2.out");
  target_bar.SetToolchain(setup.toolchain());
  ASSERT_TRUE(target_bar.OnResolved(&err));

  std::unordered_map<const Settings*, const Toolchain*> used_toolchains;
  used_toolchains[setup.settings()] = setup.toolchain();
  std::vector<const Target*> targets = {&target_foo, &target_bar};
  std::ostringstream ninja_out;
  std::ostringstream depfile_out;
  NinjaBuildWriter writer(setup.build_settings(), used_toolchains, targets,
                          setup.toolchain(), targets, ninja_out, depfile_out);
  ASSERT_FALSE(writer.Run(&err));

  const char expected_help_test[] =
      "Two or more targets generate the same output:\n"
      "  out2.out\n"
      "\n"
      "This is can often be fixed by changing one of the target names, or by \n"
      "setting an output_name on one of them.\n"
      "\n"
      "Collisions:\n"
      "  //foo:bar\n"
      "  //bar:bar\n";

  EXPECT_EQ(expected_help_test, err.help_text());
}