/*
 * Oak Video Editor - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "audiowaveformview.h"

#include <QFile>
#include <QPainter>
#include <QtMath>

#include "config/config.h"
#include "timeline/timelinecommon.h"

namespace olive
{

#define super SeekableWidget

AudioWaveformView::AudioWaveformView(QWidget *parent)
	: super(parent)
	, playback_(nullptr)
{
	setAutoFillBackground(true);
	setBackgroundRole(QPalette::Base);
	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

	// NOTE: At some point it might make sense for this to be AlignCenter since the waveform
	//       originates from the center. But we're leaving it top/left for now since it was just
	//       ported from a QWidget's paintEvent.
	setAlignment(Qt::AlignLeft | Qt::AlignTop);
}

void AudioWaveformView::SetViewer(ViewerOutput *playback)
{
	if (playback_) {
		pool_.clear();
		pool_.waitForDone();

		disconnect(playback_, &ViewerOutput::ConnectedWaveformChanged,
				   viewport(),
				   static_cast<void (QWidget::*)()>(&QWidget::update));

		SetTimebase(0);
	}

	playback_ = playback;

	if (playback_) {
		connect(playback_, &ViewerOutput::ConnectedWaveformChanged, viewport(),
				static_cast<void (QWidget::*)()>(&QWidget::update));

		SetTimebase(playback_->GetAudioParams().sample_rate_as_time_base());
	}
}

void AudioWaveformView::drawForeground(QPainter *p, const QRectF &rect)
{
	super::drawForeground(p, rect);

	if (!playback_) {
		return;
	}

	const AudioWaveformCache *wave = playback_->GetConnectedWaveform();
	if (!wave) {
		return;
	}

	const AudioParams &params = wave->GetParameters();
	if (!params.is_valid()) {
		return;
	}

	// Draw in/out points
	DrawWorkArea(p);
	DrawMarkers(p);

	// Draw waveform
	p->setPen(QColor(64, 255, 160)); // FIXME: Hardcoded color
	wave->Draw(p, rect.toRect(), GetScale(), SceneToTime(GetScroll()));

	// Draw playhead
	p->setPen(PLAYHEAD_COLOR);

	int playhead_x = TimeToScene(GetViewerNode()->GetPlayhead());
	p->drawLine(playhead_x, 0, playhead_x, height());
}

}
