/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once

#include "ui/abstract_button.h"
#include "styles/style_widgets.h"

#include <memory>

namespace Ui {

class RippleAnimation;
class NumbersAnimation;

class LinkButton : public AbstractButton {
public:
	LinkButton(QWidget *parent, const QString &text, const style::LinkButton &st = st::defaultLinkButton);

	int naturalWidth() const override;

	void setText(const QString &text);

protected:
	void paintEvent(QPaintEvent *e) override;

	void onStateChanged(State was, StateChangeSource source) override;

private:
	QString _text;
	int _textWidth = 0;
	const style::LinkButton &_st;

};

class RippleButton : public AbstractButton {
public:
	RippleButton(QWidget *parent, const style::RippleAnimation &st);

	void setForceRippled(
		bool rippled,
		anim::type animated = anim::type::normal);
	bool forceRippled() const {
		return _forceRippled;
	}

	static QPoint DisabledRippleStartPosition() {
		return QPoint(-0x3FFFFFFF, -0x3FFFFFFF);
	}

	void clearState() override;

	~RippleButton();

protected:
	void paintRipple(QPainter &p, int x, int y, TimeMs ms, const QColor *colorOverride = nullptr);

	void onStateChanged(State was, StateChangeSource source) override;

	virtual QImage prepareRippleMask() const;
	virtual QPoint prepareRippleStartPosition() const;

private:
	void ensureRipple();
	void handleRipples(bool wasDown, bool wasPress);

	const style::RippleAnimation &_st;
	std::unique_ptr<RippleAnimation> _ripple;
	bool _forceRippled = false;

};

class FlatButton : public RippleButton {
public:
	FlatButton(QWidget *parent, const QString &text, const style::FlatButton &st);

	void setText(const QString &text);
	void setWidth(int32 w);

	int32 textWidth() const;

protected:
	void paintEvent(QPaintEvent *e) override;

	void onStateChanged(State was, StateChangeSource source) override;

private:
	QString _text, _textForAutoSize;
	int _width;

	const style::FlatButton &_st;

};

class RoundButton : public RippleButton, private base::Subscriber {
public:
	RoundButton(QWidget *parent, base::lambda<QString()> textFactory, const style::RoundButton &st);

	void setText(base::lambda<QString()> textFactory);

	void setNumbersText(const QString &numbersText) {
		setNumbersText(numbersText, numbersText.toInt());
	}
	void setNumbersText(int numbers) {
		setNumbersText(QString::number(numbers), numbers);
	}
	void setWidthChangedCallback(base::lambda<void()> callback);
	void stepNumbersAnimation(TimeMs ms);
	void finishNumbersAnimation();

	int contentWidth() const;

	void setFullWidth(int newFullWidth);

	enum class TextTransform {
		NoTransform,
		ToUpper,
	};
	void setTextTransform(TextTransform transform);

	~RoundButton();

protected:
	void paintEvent(QPaintEvent *e) override;

	QImage prepareRippleMask() const override;
	QPoint prepareRippleStartPosition() const override;

private:
	void refreshText();
	QString computeFullText() const;
	void setNumbersText(const QString &numbersText, int numbers);
	void numbersAnimationCallback();
	void resizeToText();

	QString _text;
	base::lambda<QString()> _textFactory;
	int _textWidth;

	std::unique_ptr<NumbersAnimation> _numbers;

	int _fullWidthOverride = 0;

	const style::RoundButton &_st;

	TextTransform _transform = TextTransform::ToUpper;

};

class IconButton : public RippleButton {
public:
	IconButton(QWidget *parent, const style::IconButton &st);

	// Pass nullptr to restore the default icon.
	void setIconOverride(const style::icon *iconOverride, const style::icon *iconOverOverride = nullptr);
	void setRippleColorOverride(const style::color *colorOverride);

protected:
	void paintEvent(QPaintEvent *e) override;

	void onStateChanged(State was, StateChangeSource source) override;

	QImage prepareRippleMask() const override;
	QPoint prepareRippleStartPosition() const override;

private:
	const style::IconButton &_st;
	const style::icon *_iconOverride = nullptr;
	const style::icon *_iconOverrideOver = nullptr;
	const style::color *_rippleColorOverride = nullptr;

	Animation _a_over;

};

class LeftOutlineButton : public RippleButton {
public:
	LeftOutlineButton(QWidget *parent, const QString &text, const style::OutlineButton &st = st::defaultLeftOutlineButton);

	void setText(const QString &text);

protected:
	void paintEvent(QPaintEvent *e) override;

	int resizeGetHeight(int newWidth) override;

private:
	QString _text, _fullText;
	int _textWidth, _fullTextWidth;

	const style::OutlineButton &_st;

};

class CrossButton : public RippleButton {
public:
	CrossButton(QWidget *parent, const style::CrossButton &st);

	void toggle(bool shown, anim::type animated);
	void show(anim::type animated) {
		return toggle(true, animated);
	}
	void hide(anim::type animated) {
		return toggle(false, animated);
	}
	void finishAnimating() {
		_a_show.finish();
		animationCallback();
	}

	bool toggled() const {
		return _shown;
	}
	void setLoadingAnimation(bool enabled);

protected:
	void paintEvent(QPaintEvent *e) override;

	void onStateChanged(State was, StateChangeSource source) override;

	QImage prepareRippleMask() const override;
	QPoint prepareRippleStartPosition() const override;

private:
	void step_loading(TimeMs ms, bool timer);
	bool stopLoadingAnimation(TimeMs ms);
	void animationCallback();

	const style::CrossButton &_st;

	bool _shown = false;
	Animation _a_show;

	TimeMs _loadingStartMs = 0;
	TimeMs _loadingStopMs = 0;
	BasicAnimation _a_loading;

};

} // namespace Ui
