/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "media/view/media_view_playback_controls.h"

#include "media/audio/media_audio.h"
#include "media/player/media_player_button.h"
#include "media/player/media_player_dropdown.h"
#include "media/view/media_view_playback_progress.h"
#include "ui/widgets/labels.h"
#include "ui/widgets/continuous_sliders.h"
#include "ui/effects/fade_animation.h"
#include "ui/widgets/buttons.h"
#include "ui/widgets/menu/menu_item_base.h"
#include "ui/text/format_values.h"
#include "ui/cached_round_corners.h"
#include "lang/lang_keys.h"
#include "styles/style_media_view.h"

namespace Media {
namespace View {

PlaybackControls::PlaybackControls(
	QWidget *parent,
	not_null<Delegate*> delegate)
: RpWidget(parent)
, _delegate(delegate)
, _playPauseResume(this, st::mediaviewPlayButton)
, _playbackSlider(this, st::mediaviewPlayback)
, _playbackProgress(std::make_unique<PlaybackProgress>())
, _volumeToggle(this, st::mediaviewVolumeToggle)
, _volumeController(this, st::mediaviewPlayback)
, _speedToggle(Media::Audio::SupportsSpeedControl()
	? object_ptr<Player::SpeedButton>(this, st::mediaviewSpeedButton)
	: nullptr)
, _fullScreenToggle(this, st::mediaviewFullScreenButton)
, _pictureInPicture(this, st::mediaviewPipButton)
, _playedAlready(this, st::mediaviewPlayProgressLabel)
, _toPlayLeft(this, st::mediaviewPlayProgressLabel)
, _speedController(_speedToggle
	? std::make_unique<Player::SpeedController>(
		_speedToggle.data(),
		parent,
		[=](bool) {},
		[=](bool lastNonDefault) { return speedLookup(lastNonDefault); },
		[=](float64 speed) { saveSpeed(speed); })
	: nullptr)
, _fadeAnimation(std::make_unique<Ui::FadeAnimation>(this)) {
	_fadeAnimation->show();
	_fadeAnimation->setFinishedCallback([=] {
		fadeFinished();
	});
	_fadeAnimation->setUpdatedCallback([=](float64 opacity) {
		fadeUpdated(opacity);
	});

	_pictureInPicture->addClickHandler([=] {
		_delegate->playbackControlsToPictureInPicture();
	});

	_volumeController->setValue(_delegate->playbackControlsCurrentVolume());
	_volumeController->setChangeProgressCallback([=](float64 value) {
		_delegate->playbackControlsVolumeChanged(value);
		updateVolumeToggleIcon();
	});
	_volumeController->setChangeFinishedCallback([=](float64) {
		_delegate->playbackControlsVolumeChangeFinished();
	});
	updateVolumeToggleIcon();
	_volumeToggle->setClickedCallback([=] {
		_delegate->playbackControlsVolumeToggled();
		_volumeController->setValue(_delegate->playbackControlsCurrentVolume());
		updateVolumeToggleIcon();
	});

	_playPauseResume->addClickHandler([=] {
		if (_showPause) {
			_delegate->playbackControlsPause();
		} else {
			_delegate->playbackControlsPlay();
		}
	});
	_fullScreenToggle->addClickHandler([=] {
		if (_inFullScreen) {
			_delegate->playbackControlsFromFullScreen();
		} else {
			_delegate->playbackControlsToFullScreen();
		}
	});

	_playbackProgress->setValueChangedCallback([=](
			float64 value,
			float64 receivedTill) {
		_playbackSlider->setValue(value, receivedTill);
	});
	_playbackSlider->setChangeProgressCallback([=](float64 value) {
		_playbackProgress->setValue(value, false);

		// This may destroy PlaybackControls.
		handleSeekProgress(value);
	});
	_playbackSlider->setChangeFinishedCallback([=](float64 value) {
		_playbackProgress->setValue(value, false);
		handleSeekFinished(value);
	});
}

void PlaybackControls::handleSeekProgress(float64 progress) {
	if (!_lastDurationMs) return;

	const auto positionMs = std::clamp(
		static_cast<crl::time>(progress * _lastDurationMs),
		crl::time(0),
		_lastDurationMs);
	if (_seekPositionMs != positionMs) {
		_seekPositionMs = positionMs;
		refreshTimeTexts();

		// This may destroy PlaybackControls.
		_delegate->playbackControlsSeekProgress(positionMs);
	}
}

void PlaybackControls::handleSeekFinished(float64 progress) {
	if (!_lastDurationMs) return;

	const auto positionMs = std::clamp(
		static_cast<crl::time>(progress * _lastDurationMs),
		crl::time(0),
		_lastDurationMs);
	_seekPositionMs = -1;
	_delegate->playbackControlsSeekFinished(positionMs);
	refreshTimeTexts();
}

template <typename Callback>
void PlaybackControls::startFading(Callback start) {
	if (!_fadeAnimation->animating()) {
		showChildren();
		_playbackSlider->disablePaint(true);
		_volumeController->disablePaint(true);
		_childrenHidden = false;
	}
	start();
	if (_fadeAnimation->animating()) {
		for (const auto child : children()) {
			if (child->isWidgetType()
				&& child != _playbackSlider
				&& child != _volumeController) {
				static_cast<QWidget*>(child)->hide();
			}
		}
		_childrenHidden = true;
	} else {
		fadeFinished();
	}
	_playbackSlider->disablePaint(false);
	_volumeController->disablePaint(false);
}

void PlaybackControls::showAnimated() {
	startFading([this]() {
		_fadeAnimation->fadeIn(st::mediaviewShowDuration);
	});
}

void PlaybackControls::hideAnimated() {
	startFading([this]() {
		_fadeAnimation->fadeOut(st::mediaviewHideDuration);
	});
}

void PlaybackControls::fadeFinished() {
	fadeUpdated(_fadeAnimation->visible() ? 1. : 0.);
}

void PlaybackControls::fadeUpdated(float64 opacity) {
	_playbackSlider->setFadeOpacity(opacity);
	_volumeController->setFadeOpacity(opacity);
}


float64 PlaybackControls::speedLookup(bool lastNonDefault) const {
	return _delegate->playbackControlsCurrentSpeed(lastNonDefault);
}

void PlaybackControls::saveSpeed(float64 speed) {
	_delegate->playbackControlsSpeedChanged(speed);
}

void PlaybackControls::updatePlaybackSpeed(float64 speed) {
	DEBUG_LOG(("Media playback speed: update to %1.").arg(speed));
	_delegate->playbackControlsSpeedChanged(speed);
	resizeEvent(nullptr);
}

void PlaybackControls::updatePlayback(const Player::TrackState &state) {
	updatePlayPauseResumeState(state);
	_playbackProgress->updateState(state, countDownloadedTillPercent(state));
	updateTimeTexts(state);
}

void PlaybackControls::updateVolumeToggleIcon() {
	const auto volume = _delegate->playbackControlsCurrentVolume();
	_volumeToggle->setIconOverride([&] {
		return (volume <= 0.)
			? nullptr
			: (volume < 1 / 2.)
			? &st::mediaviewVolumeIcon1
			: &st::mediaviewVolumeIcon2;
	}(), [&] {
		return (volume <= 0.)
			? nullptr
			: (volume < 1 / 2.)
			? &st::mediaviewVolumeIcon1Over
			: &st::mediaviewVolumeIcon2Over;
	}());
}

float64 PlaybackControls::countDownloadedTillPercent(
		const Player::TrackState &state) const {
	if (_loadingReady > 0 && _loadingReady == _loadingTotal) {
		return 1.;
	}
	const auto header = state.fileHeaderSize;
	if (!header || _loadingReady <= header || _loadingTotal <= header) {
		return 0.;
	}
	return (_loadingReady - header) / float64(_loadingTotal - header);
}

void PlaybackControls::setLoadingProgress(int64 ready, int64 total) {
	if (_loadingReady == ready && _loadingTotal == total) {
		return;
	}
	_loadingReady = ready;
	_loadingTotal = total;
	if (_loadingReady != 0 && _loadingReady != _loadingTotal) {
		if (!_downloadProgress) {
			_downloadProgress.create(this, st::mediaviewPlayProgressLabel);
			_downloadProgress->setVisible(!_fadeAnimation->animating());
			_loadingPercent = -1;
		}
		const auto progress = total ? (ready / float64(total)) : 0.;
		const auto percent = int(base::SafeRound(progress * 100));
		if (_loadingPercent != percent) {
			_loadingPercent = percent;
			_downloadProgress->setText(QString::number(percent) + '%');
			updateDownloadProgressPosition();
			refreshFadeCache();
		}
	} else {
		_downloadProgress.destroy();
	}
}

void PlaybackControls::refreshFadeCache() {
	if (!_fadeAnimation->animating()) {
		return;
	}
	startFading([&] {
		_fadeAnimation->refreshCache();
	});
}

void PlaybackControls::updatePlayPauseResumeState(const Player::TrackState &state) {
	auto showPause = ShowPauseIcon(state.state) || (_seekPositionMs >= 0);
	if (showPause != _showPause) {
		_showPause = showPause;
		_playPauseResume->setIconOverride(_showPause ? &st::mediaviewPauseIcon : nullptr, _showPause ? &st::mediaviewPauseIconOver : nullptr);
	}
}

void PlaybackControls::updateTimeTexts(const Player::TrackState &state) {
	qint64 position = 0;

	if (Player::IsStoppedAtEnd(state.state)) {
		position = state.length;
	} else if (!Player::IsStoppedOrStopping(state.state)) {
		position = state.position;
	} else {
		position = 0;
	}
	auto playFrequency = state.frequency;
	auto playAlready = position / playFrequency;
	auto playLeft = (state.length / playFrequency) - playAlready;

	_lastDurationMs = (state.length * crl::time(1000)) / playFrequency;

	_timeAlready = Ui::FormatDurationText(playAlready);
	auto minus = QChar(8722);
	_timeLeft = minus + Ui::FormatDurationText(playLeft);

	if (_seekPositionMs < 0) {
		refreshTimeTexts();
	}
}

void PlaybackControls::refreshTimeTexts() {
	auto alreadyChanged = false, leftChanged = false;
	auto timeAlready = _timeAlready;
	auto timeLeft = _timeLeft;
	if (_seekPositionMs >= 0) {
		auto playAlready = _seekPositionMs / crl::time(1000);
		auto playLeft = (_lastDurationMs / crl::time(1000)) - playAlready;

		timeAlready = Ui::FormatDurationText(playAlready);
		auto minus = QChar(8722);
		timeLeft = minus + Ui::FormatDurationText(playLeft);
	}

	_playedAlready->setText(timeAlready, &alreadyChanged);
	_toPlayLeft->setText(timeLeft, &leftChanged);
	if (alreadyChanged || leftChanged) {
		resizeEvent(nullptr);
		refreshFadeCache();
	}
}

void PlaybackControls::setInFullScreen(bool inFullScreen) {
	if (_inFullScreen != inFullScreen) {
		_inFullScreen = inFullScreen;
		_fullScreenToggle->setIconOverride(
			_inFullScreen ? &st::mediaviewFullScreenOutIcon : nullptr,
			_inFullScreen ? &st::mediaviewFullScreenOutIconOver : nullptr);
	}
}

void PlaybackControls::resizeEvent(QResizeEvent *e) {
	const auto textSkip = st::mediaviewPlayProgressSkip;
	const auto textLeft = st::mediaviewPlayProgressLeft;
	const auto textTop = st::mediaviewPlayProgressTop;
	_playedAlready->moveToLeft(textLeft + textSkip, textTop);
	_toPlayLeft->moveToRight(textLeft + textSkip, textTop);
	const auto remove = 2 * textLeft + 4 * textSkip + _playedAlready->width() + _toPlayLeft->width();
	auto playbackWidth = width() - remove;
	_playbackSlider->resize(playbackWidth, st::mediaviewPlayback.seekSize.height());
	_playbackSlider->moveToLeft(textLeft + 2 * textSkip + _playedAlready->width(), st::mediaviewPlaybackTop);

	_playPauseResume->moveToLeft(
		(width() - _playPauseResume->width()) / 2,
		st::mediaviewPlayButtonTop);

	auto right = st::mediaviewButtonsRight;
	if (_speedToggle) {
		_speedToggle->moveToRight(right, st::mediaviewButtonsTop);
		right += _speedToggle->width() + st::mediaviewPipButtonSkip;
	}
	_pictureInPicture->moveToRight(right, st::mediaviewButtonsTop);
	right += _pictureInPicture->width() + st::mediaviewFullScreenButtonSkip;
	_fullScreenToggle->moveToRight(right, st::mediaviewButtonsTop);

	updateDownloadProgressPosition();

	auto left = st::mediaviewVolumeToggleLeft;
	_volumeToggle->moveToLeft(left, st::mediaviewVolumeTop);
	left += _volumeToggle->width() + st::mediaviewVolumeSkip;
	_volumeController->resize(
		st::mediaviewVolumeWidth,
		st::mediaviewPlayback.seekSize.height());
	_volumeController->moveToLeft(left, st::mediaviewVolumeTop + (_volumeToggle->height() - _volumeController->height()) / 2);
}

void PlaybackControls::updateDownloadProgressPosition() {
	if (!_downloadProgress) {
		return;
	}
	const auto left = _playPauseResume->x() + _playPauseResume->width();
	const auto right = _fullScreenToggle->x();
	const auto available = right - left;
	const auto x = left + (available - _downloadProgress->width()) / 2;
	const auto y = _playPauseResume->y() + (_playPauseResume->height() - _downloadProgress->height()) / 2;
	_downloadProgress->move(x, y);
}

void PlaybackControls::paintEvent(QPaintEvent *e) {
	auto p = QPainter(this);

	if (_fadeAnimation->paint(p)) {
		return;
	}
	if (_childrenHidden) {
		showChildren();
		_playbackSlider->setFadeOpacity(1.);
		_volumeController->setFadeOpacity(1.);
		_childrenHidden = false;
	}
	Ui::FillRoundRect(p, rect(), st::mediaviewSaveMsgBg, Ui::MediaviewSaveCorners);
}

void PlaybackControls::mousePressEvent(QMouseEvent *e) {
	e->accept(); // Don't pass event to the Media::View::OverlayWidget.
}

bool PlaybackControls::hasMenu() const {
	return _speedController && _speedController->menu();
}

bool PlaybackControls::dragging() const {
	return _volumeController->isChanging()
		|| _playbackSlider->isChanging()
		|| _playPauseResume->isOver()
		|| _volumeToggle->isOver()
		|| (_speedToggle && _speedToggle->isOver())
		|| _fullScreenToggle->isOver()
		|| _pictureInPicture->isOver()
		|| hasMenu();
}

PlaybackControls::~PlaybackControls() = default;

} // namespace View
} // namespace Media