/*
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) 2014-2016 John Preston, https://desktop.telegram.org
*/
#include "stdafx.h"
#include "ui/widgets/checkbox.h"

#include "lang.h"
#include "ui/effects/ripple_animation.h"

namespace Ui {
namespace {

class RadiobuttonGroup : public QMap<Radiobutton*, bool> {
	using Parent = QMap<Radiobutton*, bool>;

public:
	RadiobuttonGroup(const QString &name) : _name(name) {
	}

	void remove(Radiobutton * const &radio);
	int32 val() const {
		return _val;
	}
	void setVal(int32 val) {
		_val = val;
	}

private:
	QString _name;
	int _val = 0;

};

class Radiobuttons : public QMap<QString, RadiobuttonGroup*> {
	using Parent = QMap<QString, RadiobuttonGroup*>;

public:
	RadiobuttonGroup *reg(const QString &group) {
		typename Parent::const_iterator i = Parent::constFind(group);
		if (i == Parent::cend()) {
			i = Parent::insert(group, new RadiobuttonGroup(group));
		}
		return i.value();
	}

	int remove(const QString &group) {
		typename Parent::iterator i = Parent::find(group);
		if (i != Parent::cend()) {
			delete i.value();
			Parent::erase(i);
			return 1;
		}
		return 0;
	}

	~Radiobuttons() {
		for (typename Parent::const_iterator i = Parent::cbegin(), e = Parent::cend(); i != e; ++i) {
			delete *i;
		}
	}
};

Radiobuttons radiobuttons;

TextParseOptions _checkboxOptions = {
	TextParseMultiline, // flags
	0, // maxw
	0, // maxh
	Qt::LayoutDirectionAuto, // dir
};

} // namespace

void RadiobuttonGroup::remove(Radiobutton * const &radio) {
	Parent::remove(radio);
	if (isEmpty()) {
		radiobuttons.remove(_name);
	}
}

Checkbox::Checkbox(QWidget *parent, const QString &text, bool checked, const style::Checkbox &st) : RippleButton(parent, st.ripple)
, _st(st)
, _text(_st.style, text, _checkboxOptions)
, _checked(checked) {
	if (_st.width <= 0) {
		resizeToWidth(_text.maxWidth() - _st.width);
	} else {
		resizeToWidth(_st.width);
	}
	_checkRect = myrtlrect(_st.margin.left(), _st.margin.top(), _st.diameter, _st.diameter);

	connect(this, SIGNAL(clicked()), this, SLOT(onClicked()));

	setCursor(style::cur_pointer);
}

bool Checkbox::checked() const {
	return _checked;
}

void Checkbox::setChecked(bool checked, NotifyAboutChange notify) {
	if (_checked != checked) {
		_checked = checked;
		_a_checked.start([this] { update(_checkRect); }, _checked ? 0. : 1., _checked ? 1. : 0., _st.duration);
		if (notify == NotifyAboutChange::Notify) {
			emit changed();
		}
	}
}

void Checkbox::finishAnimations() {
	_a_checked.finish();
}

int Checkbox::naturalWidth() const {
	return _st.textPosition.x() + _text.maxWidth();
}

void Checkbox::paintEvent(QPaintEvent *e) {
	Painter p(this);

	auto ms = getms();
	auto active = _a_checked.current(ms, _checked ? 1. : 0.);
	auto color = anim::color(_st.rippleBg, _st.rippleBgActive, active);
	paintRipple(p, _st.rippleAreaPosition.x(), _st.rippleAreaPosition.y(), ms, &color);

	if (_checkRect.intersects(e->rect())) {
		auto pen = anim::pen(_st.checkFg, _st.checkFgActive, active);
		pen.setWidth(_st.thickness);
		p.setPen(pen);
		p.setBrush(anim::brush(_st.checkBg, anim::color(_st.checkFg, _st.checkFgActive, active), active));

		{
			PainterHighQualityEnabler hq(p);
			p.drawRoundedRect(QRectF(_checkRect).marginsRemoved(QMarginsF(_st.thickness / 2., _st.thickness / 2., _st.thickness / 2., _st.thickness / 2.)), st::buttonRadius - (_st.thickness / 2.), st::buttonRadius - (_st.thickness / 2.));
		}

		if (active > 0) {
			_st.checkIcon.paint(p, QPoint(_st.margin.left(), _st.margin.top()), width());
		}
	}
	if (_checkRect.contains(e->rect())) return;

	auto textWidth = qMax(width() - (_st.textPosition.x() + (_st.textPosition.x() - _st.diameter)), 1);

	p.setPen(_st.textFg);
	_text.drawLeftElided(p, _st.margin.left() + _st.textPosition.x(), _st.margin.top() + _st.textPosition.y(), textWidth, width());
}

void Checkbox::onClicked() {
	if (isDisabled()) return;
	setChecked(!checked());
}

void Checkbox::onStateChanged(State was, StateChangeSource source) {
	RippleButton::onStateChanged(was, source);

	if (isDisabled() && !(was & StateFlag::Disabled)) {
		setCursor(style::cur_default);
	} else if (!isDisabled() && (was & StateFlag::Disabled)) {
		setCursor(style::cur_pointer);
	}
}

int Checkbox::resizeGetHeight(int newWidth) {
	return _st.height;
}

QImage Checkbox::prepareRippleMask() const {
	return RippleAnimation::ellipseMask(QSize(_st.rippleAreaSize, _st.rippleAreaSize));
}

QPoint Checkbox::prepareRippleStartPosition() const {
	auto position = mapFromGlobal(QCursor::pos()) - _st.rippleAreaPosition;
	if (QRect(0, 0, _st.rippleAreaSize, _st.rippleAreaSize).contains(position)) {
		return position;
	}
	return disabledRippleStartPosition();
}

Radiobutton::Radiobutton(QWidget *parent, const QString &group, int32 value, const QString &text, bool checked, const style::Checkbox &st) : RippleButton(parent, st.ripple)
, _st(st)
, _text(_st.style, text, _checkboxOptions)
, _checked(checked)
, _group(radiobuttons.reg(group))
, _value(value) {
	if (_st.width <= 0) {
		resizeToWidth(_text.maxWidth() - _st.width);
	} else {
		resizeToWidth(_st.width);
	}
	_checkRect = myrtlrect(_st.margin.left(), _st.margin.top(), _st.diameter, _st.diameter);

	connect(this, SIGNAL(clicked()), this, SLOT(onClicked()));

	setCursor(style::cur_pointer);

	reinterpret_cast<RadiobuttonGroup*>(_group)->insert(this, true);
	if (_checked) onChanged();
}

bool Radiobutton::checked() const {
	return _checked;
}

void Radiobutton::setChecked(bool checked) {
	if (_checked != checked) {
		_checked = checked;
		_a_checked.start([this] { update(_checkRect); }, _checked ? 0. : 1., _checked ? 1. : 0., _st.duration);

		onChanged();
		emit changed();
	}
}

int Radiobutton::naturalWidth() const {
	return _st.textPosition.x() + _text.maxWidth();
}

void Radiobutton::paintEvent(QPaintEvent *e) {
	Painter p(this);

	auto ms = getms();
	auto active = _a_checked.current(ms, _checked ? 1. : 0.);
	auto color = anim::color(_st.rippleBg, _st.rippleBgActive, active);
	paintRipple(p, _st.rippleAreaPosition.x(), _st.rippleAreaPosition.y(), ms, &color);

	if (_checkRect.intersects(e->rect())) {
		PainterHighQualityEnabler hq(p);

		auto pen = anim::pen(_st.checkFg, _st.checkFgActive, active);
		pen.setWidth(_st.thickness);
		p.setPen(pen);
		p.setBrush(_st.checkBg);
		//int32 skip = qCeil(_st.thickness / 2.);
		//p.drawEllipse(_checkRect.marginsRemoved(QMargins(skip, skip, skip, skip)));
		p.drawEllipse(QRectF(_checkRect).marginsRemoved(QMarginsF(_st.thickness / 2., _st.thickness / 2., _st.thickness / 2., _st.thickness / 2.)));

		if (active > 0) {
			p.setPen(Qt::NoPen);
			p.setBrush(anim::brush(_st.checkFg, _st.checkFgActive, active));

			auto skip0 = _checkRect.width() / 2., skip1 = _st.radioSkip / 10., checkSkip = skip0 * (1. - active) + skip1 * active;
			p.drawEllipse(QRectF(_checkRect).marginsRemoved(QMarginsF(checkSkip, checkSkip, checkSkip, checkSkip)));
			//int32 fskip = qFloor(checkSkip), cskip = qCeil(checkSkip);
			//if (2 * fskip < _checkRect.width()) {
			//	if (fskip != cskip) {
			//		p.setOpacity(float64(cskip) - checkSkip);
			//		p.drawEllipse(_checkRect.marginsRemoved(QMargins(fskip, fskip, fskip, fskip)));
			//		p.setOpacity(1.);
			//	}
			//	if (2 * cskip < _checkRect.width()) {
			//		p.drawEllipse(_checkRect.marginsRemoved(QMargins(cskip, cskip, cskip, cskip)));
			//	}
			//}
		}
	}
	if (_checkRect.contains(e->rect())) return;

	auto textWidth = qMax(width() - (_st.textPosition.x() + (_st.textPosition.x() - _st.diameter)), 1);

	p.setPen(_st.textFg);
	_text.drawLeftElided(p, _st.margin.left() + _st.textPosition.x(), _st.margin.top() + _st.textPosition.y(), textWidth, width());
}

void Radiobutton::onClicked() {
	if (isDisabled()) return;
	setChecked(!checked());
}

void Radiobutton::onStateChanged(State was, StateChangeSource source) {
	RippleButton::onStateChanged(was, source);

	if (isDisabled() && !(was & StateFlag::Disabled)) {
		setCursor(style::cur_default);
	} else if (!isDisabled() && (was & StateFlag::Disabled)) {
		setCursor(style::cur_pointer);
	}
}

int Radiobutton::resizeGetHeight(int newWidth) {
	return _st.height;
}

QImage Radiobutton::prepareRippleMask() const {
	return RippleAnimation::ellipseMask(QSize(_st.rippleAreaSize, _st.rippleAreaSize));
}

QPoint Radiobutton::prepareRippleStartPosition() const {
	auto position = mapFromGlobal(QCursor::pos()) - _st.rippleAreaPosition;
	if (QRect(0, 0, _st.rippleAreaSize, _st.rippleAreaSize).contains(position)) {
		return position;
	}
	return disabledRippleStartPosition();
}

void Radiobutton::onChanged() {
	RadiobuttonGroup *group = reinterpret_cast<RadiobuttonGroup*>(_group);
	if (checked()) {
		int32 uncheck = group->val();
		if (uncheck != _value) {
			group->setVal(_value);
			for (RadiobuttonGroup::const_iterator i = group->cbegin(), e = group->cend(); i != e; ++i) {
				if (i.key()->val() == uncheck) {
					i.key()->setChecked(false);
				}
			}
		}
	} else if (group->val() == _value) {
		setChecked(true);
	}
}

Radiobutton::~Radiobutton() {
	reinterpret_cast<RadiobuttonGroup*>(_group)->remove(this);
}

} // namespace Ui