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// Copyright 2021 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 "components/reporting/metrics/metric_reporting_controller.h"

#include <memory>
#include <string>

#include "base/callback_forward.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "components/reporting/metrics/fake_reporting_settings.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace reporting {

class MetricReportingControllerTest : public ::testing::Test {
 public:
  void SetUp() override {
    settings_ = std::make_unique<FakeReportingSettings>();
    enable_count_ = 0;
    disable_count_ = 0;
    enable_cb_ = base::BindLambdaForTesting([this]() { ++enable_count_; });
    disable_cb_ = base::BindLambdaForTesting([this]() { ++disable_count_; });
  }

 protected:
  int enable_count_ = 0;
  int disable_count_ = 0;
  base::RepeatingClosure enable_cb_;
  base::RepeatingClosure disable_cb_;

  std::unique_ptr<FakeReportingSettings> settings_;

  base::test::SingleThreadTaskEnvironment task_environment_;
};

TEST_F(MetricReportingControllerTest, InvalidPath) {
  MetricReportingController controller(settings_.get(), "invalid_path",
                                       enable_cb_, disable_cb_);

  EXPECT_EQ(enable_count_, 0);
  EXPECT_EQ(disable_count_, 0);
}

TEST_F(MetricReportingControllerTest, TrustedCheck) {
  const std::string path = "path";
  settings_->SetBoolean(path, true);
  settings_->SetIsTrusted(false);

  MetricReportingController controller(settings_.get(), path, enable_cb_,
                                       disable_cb_);

  EXPECT_EQ(enable_count_, 0);
  EXPECT_EQ(disable_count_, 0);

  settings_->SetIsTrusted(true);

  EXPECT_EQ(enable_count_, 1);
  EXPECT_EQ(disable_count_, 0);
}

TEST_F(MetricReportingControllerTest, DefaultEnable) {
  const std::string path = "path";
  settings_->SetBoolean(path, true);

  MetricReportingController controller(settings_.get(), path, enable_cb_,
                                       disable_cb_);

  // Only enable_cb_ is called.
  EXPECT_EQ(enable_count_, 1);
  EXPECT_EQ(disable_count_, 0);

  // Change to disable.
  settings_->SetBoolean(path, false);

  // Only disable_cb_ is called.
  EXPECT_EQ(enable_count_, 1);
  EXPECT_EQ(disable_count_, 1);

  // Change to enable.
  settings_->SetBoolean(path, true);

  // Only enable_cb_ is called.
  EXPECT_EQ(enable_count_, 2);
  EXPECT_EQ(disable_count_, 1);
}

TEST_F(MetricReportingControllerTest, DefaultDisable) {
  const std::string path = "path";
  settings_->SetBoolean(path, false);

  MetricReportingController controller(settings_.get(), path, enable_cb_,
                                       disable_cb_);

  // No callbacks are called.
  EXPECT_EQ(enable_count_, 0);
  EXPECT_EQ(disable_count_, 0);

  // Change to enable.
  settings_->SetBoolean(path, true);

  // Only enable_cb_ is called.
  EXPECT_EQ(enable_count_, 1);
  EXPECT_EQ(disable_count_, 0);

  // Change to disable.
  settings_->SetBoolean(path, false);

  // Only disable_cb_ is called.
  EXPECT_EQ(enable_count_, 1);
  EXPECT_EQ(disable_count_, 1);
}
}  // namespace reporting