// Copyright 2017 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 "crash-reporter/kernel_warning_collector.h"

#include <unistd.h>

#include <string>

#include <base/files/file_util.h>
#include <base/files/file_enumerator.h>
#include <base/files/scoped_temp_dir.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

using base::FilePath;

namespace {

bool s_metrics = false;

const char kTestFilename[] = "test-kernel-warning";
const char kTestCrashDirectory[] = "test-crash-directory";

bool IsMetrics() {
  return s_metrics;
}

void CountCrash() { }

// Returns true if at least one file in this directory matches the pattern.
bool DirectoryHasFileWithPattern(const FilePath& directory,
                                 const std::string& pattern) {
  base::FileEnumerator enumerator(
      directory, false, base::FileEnumerator::FileType::FILES, pattern);
  FilePath path = enumerator.Next();
  return !path.empty();
}

}  // namespace

class KernelWarningCollectorMock : public KernelWarningCollector {
 public:
  MOCK_METHOD0(SetUpDBus, void());
};

class KernelWarningCollectorTest : public ::testing::Test {
  void SetUp() {
    s_metrics = true;

    EXPECT_CALL(collector_, SetUpDBus()).WillRepeatedly(testing::Return());

    collector_.Initialize(CountCrash, IsMetrics);
    ASSERT_TRUE(scoped_temp_dir_.CreateUniqueTempDir());
    test_path_ = scoped_temp_dir_.path().Append(kTestFilename);
    collector_.warning_report_path_ = test_path_.value();

    test_crash_directory_ = scoped_temp_dir_.path().Append(kTestCrashDirectory);
    CreateDirectory(test_crash_directory_);
    collector_.set_crash_directory_for_test(test_crash_directory_);
  }

 protected:
  void WriteStringToFile(const FilePath &file_path,
                         const char *data) {
    ASSERT_EQ(strlen(data), base::WriteFile(file_path, data, strlen(data)));
  }

  KernelWarningCollectorMock collector_;
  base::ScopedTempDir scoped_temp_dir_;
  FilePath test_path_;
  FilePath test_crash_directory_;
};

TEST_F(KernelWarningCollectorTest, CollectOK) {
  // Collector produces a crash report.
  WriteStringToFile(test_path_,
      "70e67541-iwl_mvm_rm_sta+0x161/0x344 [iwlmvm]()\n"
      "\n"
      "<remaining log contents>");
  EXPECT_TRUE(
      collector_.Collect(KernelWarningCollector::WarningType::kGeneric));
  EXPECT_TRUE(DirectoryHasFileWithPattern(test_crash_directory_,
                                          "kernel_warning.*.meta"));
}

TEST_F(KernelWarningCollectorTest, CollectWifiWarningOK) {
  // Collector produces a crash report with a different exec name.
  WriteStringToFile(test_path_,
      "70e67541-iwl_mvm_rm_sta+0x161/0x344 [iwlmvm]()\n"
      "\n"
      "<remaining log contents>");
  EXPECT_TRUE(collector_.Collect(KernelWarningCollector::WarningType::kWifi));
  EXPECT_TRUE(DirectoryHasFileWithPattern(test_crash_directory_,
                                          "kernel_wifi_warning.*.meta"));
}

TEST_F(KernelWarningCollectorTest, FeedbackNotAllowed) {
  // Feedback not allowed.
  s_metrics = false;
  WriteStringToFile(test_path_,
      "70e67541-iwl_mvm_rm_sta+0x161/0x344 [iwlmvm]()\n"
      "\n"
      "<remaining log contents>");
  EXPECT_TRUE(
      collector_.Collect(KernelWarningCollector::WarningType::kGeneric));
  EXPECT_TRUE(IsDirectoryEmpty(test_crash_directory_));
}