// 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 <cstring>

#include <base/check.h>
#include <base/json/json_reader.h>
#include <base/values.h>
#include <base/files/file_util.h>
#include <base/files/scoped_temp_dir.h>
#include <gtest/gtest.h>

#include "runtime_probe/functions/sysfs.h"

namespace runtime_probe {

void SysfsFunction::MockSysfsPathForTesting(base::FilePath sysfs_path) {
  CHECK(!sysfs_path.empty());
  // Can only override once.
  CHECK(sysfs_path_for_testing_.empty());
  sysfs_path_for_testing_ = sysfs_path;
}

TEST(SysfsFunctionTest, TestRead) {
  base::ScopedTempDir temp_dir;
  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());

  auto dir_a = temp_dir.GetPath().Append("Da");
  base::CreateDirectory(dir_a);
  base::WriteFile(dir_a.Append("1"), "a1", strlen("a1"));

  auto dir_b = temp_dir.GetPath().Append("Db");
  base::CreateDirectory(dir_b);
  base::WriteFile(dir_b.Append("1"), "b1", strlen("b1"));
  base::WriteFile(dir_b.Append("2"), "b2", strlen("b2"));

  auto dir_c = temp_dir.GetPath().Append("Dc");
  base::CreateDirectory(dir_c);
  base::WriteFile(dir_c.Append("2"), "c2", strlen("c2"));

  auto json_val = base::JSONReader::Read(R"({
      "keys": ["1"],
      "optional_keys": ["2"]
  })");
  json_val->SetStringKey("dir_path", temp_dir.GetPath().Append("D*").value());
  auto p = CreateProbeFunction<SysfsFunction>(*json_val);
  ASSERT_TRUE(p) << "Failed to create SysfsFunction: " << *json_val;

  auto f = dynamic_cast<SysfsFunction*>(p.get());
  ASSERT_TRUE(f) << "Loaded function is not a SysfsFunction";
  f->MockSysfsPathForTesting(temp_dir.GetPath());

  auto results = f->Eval();
  ASSERT_EQ(results.size(), 2);

  for (auto& result : results) {
    auto* value_1 = result.FindStringKey("1");
    ASSERT_TRUE(value_1) << "result: " << result;

    ASSERT_EQ(value_1->at(1), '1') << "result: " << result;

    switch (value_1->at(0)) {
      case 'a':
        break;
      case 'b': {
        auto* value_2 = result.FindStringKey("2");
        ASSERT_TRUE(value_2) << "result: " << result;
        ASSERT_EQ(*value_2, "b2") << "result: " << result;
      } break;
      default:
        ASSERT_TRUE(false) << "result: " << result;
        break;
    }
  }

  auto json_val_abs = base::JSONReader::Read(R"({
      "keys": ["/1"],
      "optional_keys": ["2"]
  })");

  json_val_abs->SetStringKey("dir_path",
                             temp_dir.GetPath().Append("D*").value());
  auto p_abs = CreateProbeFunction<SysfsFunction>(*json_val_abs);
  ASSERT_TRUE(p_abs) << "Failed to create SysfsFunction: " << *json_val_abs;

  auto f_abs = dynamic_cast<SysfsFunction*>(p_abs.get());
  ASSERT_TRUE(f_abs) << "Loaded function is not a SysfsFunction";
  f_abs->MockSysfsPathForTesting(temp_dir.GetPath());

  auto results_abs = f_abs->Eval();
  ASSERT_EQ(results_abs.size(), 0);
}

}  // namespace runtime_probe