/*
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 "boxes/translate_box.h"

#include "data/data_peer.h"
#include "lang/lang_instance.h"
#include "lang/lang_keys.h"
#include "main/main_session.h"
#include "mtproto/sender.h"
#include "settings/settings_common.h"
#include "ui/layers/generic_box.h"
#include "ui/widgets/buttons.h"
#include "ui/widgets/labels.h"
#include "ui/wrap/fade_wrap.h"
#include "ui/wrap/slide_wrap.h"
#include "styles/style_boxes.h"
#include "styles/style_chat_helpers.h"
#include "styles/style_layers.h"

namespace Ui {
namespace {

class ShowButton : public RpWidget {
public:
	ShowButton(not_null<Ui::RpWidget*> parent);

	[[nodiscard]] rpl::producer<Qt::MouseButton> clicks() const;

protected:
	void paintEvent(QPaintEvent *e) override;

private:
	LinkButton _button;

};

ShowButton::ShowButton(not_null<Ui::RpWidget*> parent)
: RpWidget(parent)
, _button(this, tr::lng_usernames_activate_confirm(tr::now)) {
	_button.sizeValue(
	) | rpl::start_with_next([=](const QSize &s) {
		resize(
			s.width() + st::emojiSuggestionsFadeRight.width(),
			s.height());
		_button.moveToRight(0, 0);
	}, lifetime());
	_button.show();
}

void ShowButton::paintEvent(QPaintEvent *e) {
	auto p = QPainter(this);
	const auto clip = e->rect();

	const auto &icon = st::emojiSuggestionsFadeRight;
	const auto fade = QRect(0, 0, icon.width(), height());
	if (fade.intersects(clip)) {
		icon.fill(p, fade);
	}
	const auto fill = clip.intersected(
		{ icon.width(), 0, width() - icon.width(), height() });
	if (!fill.isEmpty()) {
		p.fillRect(fill, st::boxBg);
	}
}

rpl::producer<Qt::MouseButton> ShowButton::clicks() const {
	return _button.clicks();
}

} // namespace

void TranslateBox(
		not_null<Ui::GenericBox*> box,
		not_null<PeerData*> peer,
		MsgId msgId,
		TextWithEntities text) {
	box->setWidth(st::boxWideWidth);
	box->addButton(tr::lng_box_ok(), [=] { box->closeBox(); });
	const auto container = box->verticalLayout();

	const auto api = box->lifetime().make_state<MTP::Sender>(
		&peer->session().mtp());

	using Flag = MTPmessages_translateText::Flag;
	const auto flags = msgId
		? (Flag::f_peer | Flag::f_msg_id)
		: !text.text.isEmpty()
		? Flag::f_text
		: Flag(0);

	const auto &stLabel = st::aboutLabel;
	const auto lineHeight = stLabel.style.lineHeight;

	Settings::AddSkip(container);
	Settings::AddSubsectionTitle(
		container,
		tr::lng_translate_box_original());

	const auto original = box->addRow(object_ptr<SlideWrap<FlatLabel>>(
		box,
		object_ptr<FlatLabel>(box, stLabel)));
	{
		original->entity()->setMarkedText(text);
		original->setMinimalHeight(lineHeight);
		original->hide(anim::type::instant);

		const auto show = Ui::CreateChild<FadeWrap<ShowButton>>(
			container.get(),
			object_ptr<ShowButton>(container));
		show->hide(anim::type::instant);
		original->geometryValue(
		) | rpl::start_with_next([=](const QRect &rect) {
			show->moveToLeft(
				rect.x() + rect.width() - show->width(),
				rect.y() + std::abs(lineHeight - show->height()) / 2);
		}, show->lifetime());
		original->entity()->heightValue(
		) | rpl::filter([](int height) {
			return height > 0;
		}) | rpl::take(1) | rpl::start_with_next([=](int height) {
			if (height > lineHeight) {
				show->show(anim::type::instant);
			}
		}, show->lifetime());
		show->toggleOn(show->entity()->clicks() | rpl::map_to(false));
		original->toggleOn(show->entity()->clicks() | rpl::map_to(true));
	}
	Settings::AddSkip(container);
	Settings::AddSkip(container);
	Settings::AddDivider(container);
	Settings::AddSkip(container);

	Settings::AddSubsectionTitle(
		container,
		rpl::single(Lang::GetInstance().nativeName()));

	const auto translated = box->addRow(object_ptr<SlideWrap<FlatLabel>>(
		box,
		object_ptr<FlatLabel>(box, stLabel)));
	translated->entity()->setSelectable(true);
	translated->hide(anim::type::instant);

	const auto showText = [=](const QString &text) {
		translated->entity()->setText(text);
		translated->show(anim::type::normal);
	};

	api->request(MTPmessages_TranslateText(
		MTP_flags(flags),
		msgId ? peer->input : MTP_inputPeerEmpty(),
		MTP_int(msgId),
		MTP_string(text.text),
		MTPstring(),
		MTP_string(Lang::LanguageIdOrDefault(Lang::Id()))
	)).done([=](const MTPmessages_TranslatedText &result) {
		const auto text = result.match([](
				const MTPDmessages_translateNoResult &data) {
			return tr::lng_translate_box_error(tr::now);
		}, [](const MTPDmessages_translateResultText &data) {
			return qs(data.vtext());
		});
		showText(text);
	}).fail([=](const MTP::Error &error) {
		showText(tr::lng_translate_box_error(tr::now));
	}).send();

}

} // namespace Ui