/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MediaSession.h"
#include "gtest/gtest.h"

using namespace mozilla;
using namespace mozilla::dom;

struct CurrentPlaybackPositionFixture {
  double mDuration = 0.0;
  double mPlaybackRate = 0.0;
  double mLastReportedTime = 0.0;

  TimeDuration mDelta;
  double mExpectedPosition = -1;
};

class CurrentPlaybackPositionTest
    : public testing::TestWithParam<CurrentPlaybackPositionFixture> {};

MOZ_RUNINIT static const std::initializer_list<CurrentPlaybackPositionFixture>
    kFixtures = {
        // position must be positive
        {
            10.0,
            1.0,
            0.0,
            TimeDuration::FromSeconds(-1.0),
            0.0,
        },
        // no time elapsed
        {
            10.0,
            1.0,
            0.0,
            TimeDuration::FromSeconds(0.0),
            0.0,
        },
        {
            10.0,
            1.0,
            0.0,
            TimeDuration::FromSeconds(3.0),
            3.0,
        },
        {
            10.0,
            1.0,
            0.0,
            TimeDuration::FromSeconds(10.0),
            10.0,
        },
        // position is clamped to the duration
        {
            10.0,
            1.0,
            0.0,
            TimeDuration::FromSeconds(20.0),
            10.0,
        },
        {
            10.0,
            1.0,
            5.0,
            TimeDuration::FromSeconds(-1.0),
            4.0,
        },
        {
            10.0,
            1.0,
            5.0,
            TimeDuration::FromSeconds(-6.0),
            0.0,
        },
        {
            10.0,
            1.0,
            5.0,
            TimeDuration::FromSeconds(6.0),
            10.0,
        },
        // expected: 5s + 2 * 2s
        {
            10.0,
            2.0,
            5.0,
            TimeDuration::FromSeconds(2.0),
            9.0,
        },
        // expected: 5s + 0.5 * 2s
        {
            10.0,
            0.5,
            5.0,
            TimeDuration::FromSeconds(2.0),
            6.0,
        },
        {
            5.0,
            4.0,
            10.0,
            TimeDuration::FromSeconds(20.0),
            5.0,
        },
        // empty media (0s)
        {
            0.0,
            4.0,
            5.0,
            TimeDuration::FromSeconds(20.0),
            0.0,
        },
};

TEST_P(CurrentPlaybackPositionTest, Run) {
  const auto& fixture = GetParam();
  PositionState state(fixture.mDuration, fixture.mPlaybackRate,
                      fixture.mLastReportedTime, TimeStamp::Now());

  ASSERT_DOUBLE_EQ(state.CurrentPlaybackPosition(state.mPositionUpdatedTime +
                                                 fixture.mDelta),
                   fixture.mExpectedPosition);
}

INSTANTIATE_TEST_SUITE_P(PositionState, CurrentPlaybackPositionTest,
                         testing::ValuesIn(kFixtures));