/*
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 "chat_helpers/bot_keyboard.h"

#include "history/history.h"
#include "history/history_item_components.h"
#include "data/data_user.h"
#include "data/data_session.h"
#include "main/main_session.h"
#include "ui/cached_round_corners.h"
#include "facades.h"
#include "styles/style_widgets.h"
#include "styles/style_chat.h"

namespace {

class Style : public ReplyKeyboard::Style {
public:
	Style(
		not_null<BotKeyboard*> parent,
		const style::BotKeyboardButton &st);

	int buttonRadius() const override;

	void startPaint(Painter &p) const override;
	const style::TextStyle &textStyle() const override;
	void repaint(not_null<const HistoryItem*> item) const override;

protected:
	void paintButtonBg(
		Painter &p,
		const QRect &rect,
		float64 howMuchOver) const override;
	void paintButtonIcon(
		Painter &p,
		const QRect &rect,
		int outerWidth,
		HistoryMessageMarkupButton::Type type) const override;
	void paintButtonLoading(Painter &p, const QRect &rect) const override;
	int minButtonWidth(HistoryMessageMarkupButton::Type type) const override;

private:
	not_null<BotKeyboard*> _parent;

};

Style::Style(
	not_null<BotKeyboard*> parent,
	const style::BotKeyboardButton &st)
: ReplyKeyboard::Style(st), _parent(parent) {
}

void Style::startPaint(Painter &p) const {
	p.setPen(st::botKbColor);
	p.setFont(st::botKbStyle.font);
}

const style::TextStyle &Style::textStyle() const {
	return st::botKbStyle;
}

void Style::repaint(not_null<const HistoryItem*> item) const {
	_parent->update();
}

int Style::buttonRadius() const {
	return st::roundRadiusSmall;
}

void Style::paintButtonBg(
		Painter &p,
		const QRect &rect,
		float64 howMuchOver) const {
	Ui::FillRoundRect(p, rect, st::botKbBg, Ui::BotKeyboardCorners);
}

void Style::paintButtonIcon(
		Painter &p,
		const QRect &rect,
		int outerWidth,
		HistoryMessageMarkupButton::Type type) const {
	// Buttons with icons should not appear here.
}

void Style::paintButtonLoading(Painter &p, const QRect &rect) const {
	// Buttons with loading progress should not appear here.
}

int Style::minButtonWidth(HistoryMessageMarkupButton::Type type) const {
	int result = 2 * buttonPadding();
	return result;
}

} // namespace

BotKeyboard::BotKeyboard(not_null<Main::Session*> session, QWidget *parent)
: TWidget(parent)
, _session(session)
, _st(&st::botKbButton) {
	setGeometry(0, 0, _st->margin, st::botKbScroll.deltat);
	_height = st::botKbScroll.deltat;
	setMouseTracking(true);
}

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

	auto clip = e->rect();
	p.fillRect(clip, st::historyComposeAreaBg);

	if (_impl) {
		int x = rtl() ? st::botKbScroll.width : _st->margin;
		p.translate(x, st::botKbScroll.deltat);
		_impl->paint(p, width(), clip.translated(-x, -st::botKbScroll.deltat));
	}
}

void BotKeyboard::mousePressEvent(QMouseEvent *e) {
	_lastMousePos = e->globalPos();
	updateSelected();

	ClickHandler::pressed();
}

void BotKeyboard::mouseMoveEvent(QMouseEvent *e) {
	_lastMousePos = e->globalPos();
	updateSelected();
}

void BotKeyboard::mouseReleaseEvent(QMouseEvent *e) {
	_lastMousePos = e->globalPos();
	updateSelected();

	if (ClickHandlerPtr activated = ClickHandler::unpressed()) {
		ActivateClickHandler(window(), activated, e->button());
	}
}

void BotKeyboard::enterEventHook(QEvent *e) {
	_lastMousePos = QCursor::pos();
	updateSelected();
}

void BotKeyboard::leaveEventHook(QEvent *e) {
	clearSelection();
}

bool BotKeyboard::moderateKeyActivate(int key) {
	if (const auto item = _session->data().message(_wasForMsgId)) {
		if (const auto markup = item->Get<HistoryMessageReplyMarkup>()) {
			if (key >= Qt::Key_1 && key <= Qt::Key_9) {
				const auto index = int(key - Qt::Key_1);
				if (!markup->rows.empty()
					&& index >= 0
					&& index < int(markup->rows.front().size())) {
					App::activateBotCommand(item, 0, index);
					return true;
				}
			} else if (const auto user = item->history()->peer->asUser()) {
				if (user->isBot() && item->from() == user) {
					if (key == Qt::Key_Q) {
						App::sendBotCommand(user, user, qsl("/translate"));
					} else if (key == Qt::Key_W) {
						App::sendBotCommand(user, user, qsl("/eng"));
					}
					return true;
				}
			}
		}
	}
	return false;
}

void BotKeyboard::clickHandlerActiveChanged(const ClickHandlerPtr &p, bool active) {
	if (!_impl) return;
	_impl->clickHandlerActiveChanged(p, active);
}

void BotKeyboard::clickHandlerPressedChanged(const ClickHandlerPtr &p, bool pressed) {
	if (!_impl) return;
	_impl->clickHandlerPressedChanged(p, pressed);
}

bool BotKeyboard::updateMarkup(HistoryItem *to, bool force) {
	if (!to || !to->definesReplyKeyboard()) {
		if (_wasForMsgId.msg) {
			_maximizeSize = _singleUse = _forceReply = false;
			_wasForMsgId = FullMsgId();
			_impl = nullptr;
			return true;
		}
		return false;
	}

	if (_wasForMsgId == FullMsgId(to->channelId(), to->id) && !force) {
		return false;
	}

	_wasForMsgId = FullMsgId(to->channelId(), to->id);

	auto markupFlags = to->replyKeyboardFlags();
	_forceReply = markupFlags & MTPDreplyKeyboardMarkup_ClientFlag::f_force_reply;
	_maximizeSize = !(markupFlags & MTPDreplyKeyboardMarkup::Flag::f_resize);
	_singleUse = _forceReply || (markupFlags & MTPDreplyKeyboardMarkup::Flag::f_single_use);

	_impl = nullptr;
	if (auto markup = to->Get<HistoryMessageReplyMarkup>()) {
		if (!markup->rows.empty()) {
			_impl = std::make_unique<ReplyKeyboard>(
				to,
				std::make_unique<Style>(this, *_st));
		}
	}

	resizeToWidth(width(), _maxOuterHeight);

	return true;
}

bool BotKeyboard::hasMarkup() const {
	return _impl != nullptr;
}

bool BotKeyboard::forceReply() const {
	return _forceReply;
}

int BotKeyboard::resizeGetHeight(int newWidth) {
	updateStyle(newWidth);
	_height = st::botKbScroll.deltat + st::botKbScroll.deltab + (_impl ? _impl->naturalHeight() : 0);
	if (_maximizeSize) {
		accumulate_max(_height, _maxOuterHeight);
	}
	if (_impl) {
		int implWidth = newWidth - _st->margin - st::botKbScroll.width;
		int implHeight = _height - (st::botKbScroll.deltat + st::botKbScroll.deltab);
		_impl->resize(implWidth, implHeight);
	}
	return _height;
}

bool BotKeyboard::maximizeSize() const {
	return _maximizeSize;
}

bool BotKeyboard::singleUse() const {
	return _singleUse;
}

void BotKeyboard::updateStyle(int newWidth) {
	if (!_impl) return;

	int implWidth = newWidth - st::botKbButton.margin - st::botKbScroll.width;
	_st = _impl->isEnoughSpace(implWidth, st::botKbButton) ? &st::botKbButton : &st::botKbTinyButton;

	_impl->setStyle(std::make_unique<Style>(this, *_st));
}

void BotKeyboard::clearSelection() {
	if (_impl) {
		if (ClickHandler::setActive(ClickHandlerPtr(), this)) {
			Ui::Tooltip::Hide();
			setCursor(style::cur_default);
		}
	}
}

QPoint BotKeyboard::tooltipPos() const {
	return _lastMousePos;
}

bool BotKeyboard::tooltipWindowActive() const {
	return Ui::AppInFocus() && Ui::InFocusChain(window());
}

QString BotKeyboard::tooltipText() const {
	if (ClickHandlerPtr lnk = ClickHandler::getActive()) {
		return lnk->tooltip();
	}
	return QString();
}

void BotKeyboard::updateSelected() {
	Ui::Tooltip::Show(1000, this);

	if (!_impl) return;

	auto p = mapFromGlobal(_lastMousePos);
	auto x = rtl() ? st::botKbScroll.width : _st->margin;

	auto link = _impl->getLink(p - QPoint(x, _st->margin));
	if (ClickHandler::setActive(link, this)) {
		Ui::Tooltip::Hide();
		setCursor(link ? style::cur_pointer : style::cur_default);
	}
}

BotKeyboard::~BotKeyboard() = default;