// Copyright 2018 The Chromium OS 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 "authpolicy/policy/preg_parser.h"

#include <string>
#include <utility>

#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/json/json_writer.h>
#include <base/logging.h>
#include <base/memory/ptr_util.h>
#include <base/values.h>
#include <components/policy/core/common/policy_load_status.h>
#include <components/policy/core/common/registry_dict.h>
#include <gtest/gtest.h>

namespace policy {
namespace preg_parser {
namespace {

base::FilePath GetTestDataPath(const std::string& filename) {
  std::string testdata_dir =
      std::string(getenv("srcdir") ? getenv("srcdir") : ".") +
      "/policy/testdata";
  return base::FilePath(testdata_dir).Append(filename);
}

// Check whether two RegistryDicts equal each other.
testing::AssertionResult RegistryDictEquals(const RegistryDict& a,
                                            const RegistryDict& b) {
  auto iter_key_a = a.keys().begin();
  auto iter_key_b = b.keys().begin();
  for (; iter_key_a != a.keys().end() && iter_key_b != b.keys().end();
       ++iter_key_a, ++iter_key_b) {
    if (iter_key_a->first != iter_key_b->first) {
      return testing::AssertionFailure() << "Key mismatch " << iter_key_a->first
                                         << " vs. " << iter_key_b->first;
    }
    testing::AssertionResult result =
        RegistryDictEquals(*iter_key_a->second, *iter_key_b->second);
    if (!result)
      return result;
  }

  if (iter_key_a != a.keys().end()) {
    return testing::AssertionFailure()
           << "Unmatched key: " << iter_key_a->first << " vs. [nothing]";
  }
  if (iter_key_b != b.keys().end()) {
    return testing::AssertionFailure()
           << "Unmatched key: [nothing] vs. " << iter_key_b->first;
  }

  auto iter_value_a = a.values().begin();
  auto iter_value_b = b.values().begin();
  for (; iter_value_a != a.values().end() && iter_value_b != b.values().end();
       ++iter_value_a, ++iter_value_b) {
    if (iter_value_a->first != iter_value_b->first ||
        *(iter_value_a->second) != *(iter_value_b->second)) {
      return testing::AssertionFailure()
             << "Value mismatch " << iter_value_a->first << "="
             << *iter_value_a->second.get() << " vs. " << iter_value_b->first
             << "=" << *iter_value_b->second.get();
    }
  }

  if (iter_value_a != a.values().end()) {
    return testing::AssertionFailure()
           << "Unmatched value: " << iter_value_a->first << " vs. [nothing]";
  }
  if (iter_value_b != b.values().end()) {
    return testing::AssertionFailure()
           << "Unmatched value: [nothing] vs. " << iter_value_b->first;
  }

  return testing::AssertionSuccess();
}

void SetInteger(RegistryDict* dict, const std::string& name, int value) {
  dict->SetValue(name, std::make_unique<base::Value>(value));
}

void SetString(RegistryDict* dict,
               const std::string& name,
               const std::string& value) {
  dict->SetValue(name, std::make_unique<base::Value>(value));
}

TEST(PRegParserTest, TestParseFile) {
  // Prepare the test dictionary with some data so the test can check that the
  // PReg action triggers work, i.e. remove these items.
  RegistryDict dict;
  SetInteger(&dict, "DeleteValuesTest1", 1);
  SetString(&dict, "DeleteValuesTest2", "2");
  dict.SetKey("DeleteKeysTest1", std::make_unique<RegistryDict>());
  std::unique_ptr<RegistryDict> delete_keys_test(new RegistryDict());
  SetInteger(delete_keys_test.get(), "DeleteKeysTest2Entry", 1);
  dict.SetKey("DeleteKeysTest2", std::move(delete_keys_test));
  SetInteger(&dict, "DelTest", 1);
  std::unique_ptr<RegistryDict> subdict(new RegistryDict());
  SetInteger(subdict.get(), "DelValsTest1", 1);
  SetString(subdict.get(), "DelValsTest2", "2");
  subdict->SetKey("DelValsTest3", std::make_unique<RegistryDict>());
  dict.SetKey("DelValsTest", std::move(subdict));

  // Run the parser.
  base::FilePath test_file(GetTestDataPath("registry.pol"));
  PolicyLoadStatusSampler status;
  ASSERT_TRUE(preg_parser::ReadFile(test_file, u"SOFTWARE\\Policies\\Chromium",
                                    &dict, &status));

  // Build the expected output dictionary.
  RegistryDict expected;
  std::unique_ptr<RegistryDict> del_vals_dict(new RegistryDict());
  del_vals_dict->SetKey("DelValsTest3", std::make_unique<RegistryDict>());
  expected.SetKey("DelValsTest", std::move(del_vals_dict));
  SetInteger(&expected, "HomepageIsNewTabPage", 1);
  SetString(&expected, "HomepageLocation", "http://www.example.com");
  SetInteger(&expected, "RestoreOnStartup", 4);
  std::unique_ptr<RegistryDict> startup_urls(new RegistryDict());
  SetString(startup_urls.get(), "1", "http://www.chromium.org");
  SetString(startup_urls.get(), "2", "http://www.example.com");
  expected.SetKey("RestoreOnStartupURLs", std::move(startup_urls));
  SetInteger(&expected, "ShowHomeButton", 1);
  SetString(&expected, "Snowman", "\xE2\x98\x83");
  SetString(&expected, "Empty", "");
  SetString(&expected, "WallpaperImage",
            R"({
  "url": "http://www.example.com/risqué_wallpaper.jpg",
  "hash": "8b64f148e621dcf189eeb56d41ec6b8293916b84c64fd34d73ecba5e847b51ce"
}
)");

  EXPECT_TRUE(RegistryDictEquals(dict, expected));
}

TEST(PRegParserTest, LoadStatusSampling) {
  base::FilePath test_file(GetTestDataPath("does_not_exist.pol"));
  PolicyLoadStatusSampler status;
  RegistryDict dict;
  ASSERT_FALSE(preg_parser::ReadFile(test_file, u"SOFTWARE\\Policies\\Chromium",
                                     &dict, &status));

  // Tests load status sampling.
  PolicyLoadStatusSampler::StatusSet expected_status_set;
  expected_status_set[POLICY_LOAD_STATUS_STARTED] = true;
  expected_status_set[POLICY_LOAD_STATUS_READ_ERROR] = true;
  EXPECT_EQ(expected_status_set, status.GetStatusSet());
}

}  // namespace
}  // namespace preg_parser
}  // namespace policy