//
// This file is part of Kepka,
// an unofficial desktop version of Telegram messaging app,
// see https://github.com/procxx/kepka
//
// Kepka 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.
//
// It 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.
//
// In addition, as a special exception, the copyright holders give permission
// to link the code of portions of this program with the OpenSSL library.
//
// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
//
#pragma once

#include "styles/style_widgets.h"
#include "ui/animation.h"
#include "ui/twidget.h"

class QMouseEvent;
class QTimerEvent;

namespace Ui {

class RippleAnimation;

class DiscreteSlider : public TWidget {
public:
	DiscreteSlider(QWidget *parent);

	void addSection(const QString &label);
	void setSections(const QStringList &labels);
	int activeSection() const {
		return _activeIndex;
	}
	void setActiveSection(int index);
	void setActiveSectionFast(int index);

	using SectionActivatedCallback = Fn<void()>;
	void setSectionActivatedCallback(SectionActivatedCallback &&callback);

protected:
	void timerEvent(QTimerEvent *e) override;
	void mousePressEvent(QMouseEvent *e) override;
	void mouseMoveEvent(QMouseEvent *e) override;
	void mouseReleaseEvent(QMouseEvent *e) override;

	int resizeGetHeight(int newWidth) override = 0;

	struct Section {
		Section(const QString &label, const style::font &font);

		int left, width;
		QString label;
		int labelWidth;
		QSharedPointer<RippleAnimation> ripple;
	};

	int getCurrentActiveLeft(TimeMs ms);

	int getSectionsCount() const {
		return _sections.size();
	}

	template <typename Lambda> void enumerateSections(Lambda callback);

	virtual void startRipple(int sectionIndex) {}

	void stopAnimation() {
		_a_left.finish();
	}

	void setSelectOnPress(bool selectOnPress);

private:
	void activateCallback();
	virtual const style::font &getLabelFont() const = 0;
	virtual int getAnimationDuration() const = 0;

	int getIndexFromPosition(QPoint pos);
	void setSelectedSection(int index);

	QList<Section> _sections;
	int _activeIndex = 0;
	bool _selectOnPress = true;

	SectionActivatedCallback _callback;

	int _pressed = -1;
	int _selected = 0;
	Animation _a_left;

	int _timerId = -1;
	TimeMs _callbackAfterMs = 0;
};

class SettingsSlider : public DiscreteSlider {
public:
	SettingsSlider(QWidget *parent, const style::SettingsSlider &st = st::defaultSettingsSlider);

	void setRippleTopRoundRadius(int radius);

protected:
	void paintEvent(QPaintEvent *e) override;

	int resizeGetHeight(int newWidth) override;

	void startRipple(int sectionIndex) override;

private:
	const style::font &getLabelFont() const override;
	int getAnimationDuration() const override;
	QImage prepareRippleMask(int sectionIndex, const Section &section);

	void resizeSections(int newWidth);

	const style::SettingsSlider &_st;
	int _rippleTopRoundRadius = 0;
};

} // namespace Ui