/*
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 "ui/widgets/expandable_peer_list.h"

#include "data/data_peer.h"
#include "info/profile/info_profile_values.h"
#include "lang/lang_text_entity.h"
#include "ui/controls/userpic_button.h"
#include "ui/rect.h"
#include "ui/text/text_utilities.h"
#include "ui/vertical_list.h"
#include "ui/widgets/buttons.h"
#include "ui/widgets/participants_check_view.h"
#include "ui/wrap/slide_wrap.h"
#include "ui/wrap/vertical_layout.h"
#include "styles/style_boxes.h"
#include "styles/style_layers.h"
#include "styles/style_widgets.h"

#include <cstdlib>

namespace Ui {
namespace {

[[nodiscard]] TextWithEntities ParticipantsExpanderText(int count) {
	return tr::marked()
		.append(st::moderateBoxExpand)
		.append(QString::number(std::abs(count)));
}

} // namespace

void AddExpandablePeerList(
		not_null<Ui::Checkbox*> checkbox,
		not_null<ExpandablePeerListController*> controller,
		not_null<Ui::VerticalLayout*> inner) {
	const auto &participants = controller->data.participants;
	const auto hideRightButton = controller->data.hideRightButton;
	const auto checkTopOnAllInner = controller->data.checkTopOnAllInner;
	const auto isSingle = controller->data.skipSingle
		? false
		: (participants.size() == 1);
	if (isSingle) {
		const auto p = participants.front();
		controller->collectRequests = [=] { return Participants{ p }; };
		return;
	}
	const auto count = int(participants.size());
	const auto button = !hideRightButton
		? Ui::CreateChild<Ui::ExpanderButton>(
			inner,
			ParticipantsExpanderText(count))
		: nullptr;
	if (button) {
		button->resize(Ui::ExpanderButton::ComputeSize(
			ParticipantsExpanderText(count)));
	}

	const auto overlay = Ui::CreateChild<Ui::AbstractButton>(inner);

	checkbox->geometryValue(
	) | rpl::on_next([=](const QRect &rect) {
		overlay->setGeometry(rect);
		overlay->raise();

		if (button) {
			button->moveToRight(
				st::moderateBoxExpandRight,
				rect.top() + (rect.height() - button->height()) / 2,
				inner->width());
			button->raise();
		}
	}, overlay->lifetime());

	controller->toggleRequestsFromInner.events(
	) | rpl::on_next([=](bool toggled) {
		checkbox->setChecked(toggled);
	}, checkbox->lifetime());
	if (button) {
		button->setClickedCallback([=] {
			button->checkView()->setChecked(
				!button->checkView()->checked(),
				anim::type::normal);
			controller->toggleRequestsFromTop.fire_copy(
				button->checkView()->checked());
		});
	}
	overlay->setClickedCallback([=] {
		checkbox->setChecked(!checkbox->checked());
		controller->checkAllRequests.fire_copy(checkbox->checked());
	});
	{
		const auto wrap = inner->add(
			object_ptr<Ui::SlideWrap<Ui::VerticalLayout>>(
				inner,
				object_ptr<Ui::VerticalLayout>(inner)));
		wrap->toggle(hideRightButton, anim::type::instant);

		controller->toggleRequestsFromTop.events(
		) | rpl::on_next([=](bool toggled) {
			wrap->toggle(toggled, anim::type::normal);
		}, wrap->lifetime());

		const auto container = wrap->entity();
		Ui::AddSkip(container);

		auto &lifetime = wrap->lifetime();
		const auto clicks = lifetime.make_state<rpl::event_stream<>>();
		const auto checkboxes = ranges::views::all(
			participants
		) | ranges::views::transform([&](not_null<PeerData*> peer) {
			const auto line = container->add(
				object_ptr<Ui::AbstractButton>(container));
			const auto &st = st::moderateBoxUserpic;
			line->resize(line->width(), st.size.height());

			using namespace Info::Profile;
			auto name = controller->data.bold
				? (NameValue(peer) | rpl::map(tr::bold) | rpl::type_erased)
				: NameValue(peer) | rpl::map(tr::marked);
			const auto userpic
				= Ui::CreateChild<Ui::UserpicButton>(line, peer, st);
			const auto checkbox = Ui::CreateChild<Ui::Checkbox>(
				line,
				controller->data.messagesCounts
				? rpl::combine(
					std::move(name),
					rpl::duplicate(controller->data.messagesCounts)
				) | rpl::map([=](const auto &richName, const auto &map) {
					const auto it = map.find(peer->id);
					return (it == map.end() || !it->second)
						? richName
						: TextWithEntities{
							(u"(%1) "_q).arg(it->second)
						}.append(richName);
				})
				: std::move(name) | rpl::type_erased,
				st::defaultBoxCheckbox,
				std::make_unique<Ui::CheckView>(
					st::defaultCheck,
					ranges::contains(controller->data.checked, peer->id)));
			checkbox->setCheckAlignment(style::al_left);
			rpl::combine(
				line->widthValue(),
				checkbox->widthValue()
			) | rpl::on_next([=](int width, int) {
				userpic->moveToLeft(
					st::boxRowPadding.left()
						+ checkbox->checkRect().width()
						+ st::defaultBoxCheckbox.textPosition.x(),
					0);
				const auto skip = st::defaultBoxCheckbox.textPosition.x();
				checkbox->resizeToWidth(width
					- rect::right(userpic)
					- skip
					- st::boxRowPadding.right());
				checkbox->moveToLeft(
					rect::right(userpic) + skip,
					((userpic->height() - checkbox->height()) / 2)
						+ st::defaultBoxCheckbox.margin.top());
			}, checkbox->lifetime());

			userpic->setAttribute(Qt::WA_TransparentForMouseEvents);
			checkbox->setAttribute(Qt::WA_TransparentForMouseEvents);

			line->setClickedCallback([=] {
				checkbox->setChecked(!checkbox->checked());
				clicks->fire({});
			});

			return checkbox;
		}) | ranges::to_vector;

		clicks->events(
		) | rpl::on_next([=] {
			controller->toggleRequestsFromInner.fire_copy(
				checkTopOnAllInner
				? ranges::all_of(checkboxes, &Ui::Checkbox::checked)
				: ranges::any_of(checkboxes, &Ui::Checkbox::checked));
		}, container->lifetime());

		controller->checkAllRequests.events(
		) | rpl::on_next([=](bool checked) {
			for (const auto &c : checkboxes) {
				c->setChecked(checked);
			}
		}, container->lifetime());

		controller->collectRequests = [=] {
			auto result = Participants();
			for (auto i = 0; i < checkboxes.size(); i++) {
				if (checkboxes[i]->checked()) {
					result.push_back(participants[i]);
				}
			}
			return result;
		};
	}
}

} // namespace Ui