/*
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 "menu/menu_antispam_validator.h"

#include "apiwrap.h"
#include "boxes/peers/edit_participants_box.h"
#include "boxes/peers/edit_peer_info_box.h"
#include "data/data_changes.h"
#include "data/data_channel.h"
#include "data/data_session.h"
#include "history/history_item.h"
#include "lang/lang_keys.h"
#include "main/main_account.h"
#include "main/main_app_config.h"
#include "main/main_session.h"
#include "settings/settings_common.h"
#include "ui/text/text_utilities.h"
#include "ui/toasts/common_toasts.h"
#include "ui/widgets/buttons.h"
#include "ui/widgets/popup_menu.h"
#include "ui/wrap/slide_wrap.h"
#include "ui/wrap/vertical_layout.h"
#include "window/window_session_controller.h"
#include "styles/style_info.h"
#include "styles/style_menu_icons.h"
#include "styles/style_settings.h"

namespace AntiSpamMenu {
namespace {

[[nodiscard]] int EnableAntiSpamMinMembers(not_null<ChannelData*> channel) {
	return channel->session().account().appConfig().get<int>(
		u"telegram_antispam_group_size_min"_q,
		100);
}

[[nodiscard]] UserId AntiSpamUserId(not_null<ChannelData*> channel) {
	const auto id = channel->session().account().appConfig().get<QString>(
		u"telegram_antispam_user_id"_q,
		QString());
	return UserId(id.toULongLong());
}

} // namespace

AntiSpamValidator::AntiSpamValidator(
	not_null<Window::SessionController*> controller,
	not_null<ChannelData*> channel)
: _channel(channel)
, _controller(controller) {
}

object_ptr<Ui::RpWidget> AntiSpamValidator::createButton() const {
	const auto channel = _channel;
	auto container = object_ptr<Ui::SlideWrap<Ui::VerticalLayout>>(
		(QWidget*)nullptr,
		object_ptr<Ui::VerticalLayout>((QWidget*)nullptr));
	struct State {
		rpl::variable<bool> locked;
		rpl::event_stream<bool> toggled;
	};
	Settings::AddSkip(container->entity());
	const auto state = container->lifetime().make_state<State>();
	const auto button = container->entity()->add(
		EditPeerInfoBox::CreateButton(
			container->entity(),
			tr::lng_manage_peer_antispam(),
			rpl::single(QString()),
			[] {},
			st::manageGroupTopicsButton,
			{ &st::infoRoundedIconAdministrators, Settings::kIconPurple }
	))->toggleOn(rpl::single(
		_channel->antiSpamMode()
	) | rpl::then(state->toggled.events()));
	container->show(anim::type::instant);
	Settings::AddSkip(container->entity());
	Settings::AddDividerText(
		container->entity(),
		tr::lng_manage_peer_antispam_about());

	const auto updateLocked = [=] {
		const auto &config = channel->session().account().appConfig();
		const auto min = EnableAntiSpamMinMembers(channel);
		const auto locked = (channel->membersCount() <= min);
		state->locked = locked;
		button->setToggleLocked(locked);
	};
	using UpdateFlag = Data::PeerUpdate::Flag;
	_channel->session().changes().peerUpdates(
		_channel,
		UpdateFlag::Members | UpdateFlag::Admins
	) | rpl::start_with_next(updateLocked, button->lifetime());
	updateLocked();
	button->toggledValue(
	) | rpl::start_with_next([=, controller = _controller](bool toggled) {
		if (state->locked.current() && toggled) {
			state->toggled.fire(false);
			Ui::ShowMultilineToast({
				.parentOverride = Window::Show(controller).toastParent(),
				.text = tr::lng_manage_peer_antispam_not_enough(
					tr::now,
					lt_count,
					EnableAntiSpamMinMembers(channel),
					Ui::Text::RichLangValue),
			});
		} else {
			channel->session().api().request(MTPchannels_ToggleAntiSpam(
				channel->inputChannel,
				MTP_bool(toggled)
			)).done([=](const MTPUpdates &result) {
				channel->session().api().applyUpdates(result);
			}).send();
		}
	}, button->lifetime());

	return container;
}

void AntiSpamValidator::resolveUser(Fn<void()> finish) const {
	if (_channel->antiSpamMode()) {
		const auto mtpUserId = peerToBareMTPInt(AntiSpamUserId(_channel));
		_channel->session().api().request(MTPusers_GetUsers(
			MTP_vector<MTPInputUser>(1, MTP_inputUser(mtpUserId, MTPlong()))
		)).done([=, channel = _channel](const MTPVector<MTPUser> &result) {
			channel->owner().processUsers(result);
			finish();
		}).fail([=] {
			finish();
		}).send();
	} else {
		finish();
	}
}

UserData *AntiSpamValidator::maybeAppendUser() const {
	if (_channel->antiSpamMode()) {
		const auto userId = AntiSpamUserId(_channel);
		if (const auto user = _channel->owner().user(userId)) {
			return user;
		}
	}
	return nullptr;
}

void AntiSpamValidator::addAction(
		not_null<Ui::PopupMenu*> menu,
		FullMsgId fullId) const {
	if (!fullId) {
		return;
	}
	const auto antiSpamUserId = AntiSpamUserId(_channel);
	const auto suggestReport = [&] {
		const auto text = tr::lng_admin_log_antispam_menu_report_toast(
			tr::now,
			lt_link,
			Ui::Text::Link(
				tr::lng_admin_log_antispam_menu_report_toast_link(
					tr::now),
				"internal:show"),
			Ui::Text::RichLangValue);
		const auto showToast = [=,
				window = _controller,
				channel = _channel] {
			Ui::ShowMultilineToast({
				.parentOverride = Window::Show(window).toastParent(),
				.text = text,
				.duration = ApiWrap::kJoinErrorDuration,
				.filter = [=](
						const ClickHandlerPtr&,
						Qt::MouseButton) {
					ParticipantsBoxController::Start(
						window,
						channel,
						ParticipantsRole::Admins);
					return true;
				},
			});
		};
		menu->addAction(
			tr::lng_admin_log_antispam_menu_report(tr::now),
			[=, channel = _channel] {
				_channel->session().api().request(
					MTPchannels_ReportAntiSpamFalsePositive(
						channel->inputChannel,
						MTP_int(fullId.msg)
				)).done(showToast).send();
			},
			&st::menuIconAdmin);
	};
	const auto &data = _channel->owner();
	const auto findItem = [&](FullMsgId id, int offset) {
		id.msg.bare -= offset;
		if (const auto item = data.message(id)) {
			if (peerToUser(item->from()->id) == antiSpamUserId) {
				suggestReport();
				return true;
			}
		}
		return false;
	};
	// Context menu on service message.
	if (!findItem(fullId, 0)) {
		// Take a previous.
		if (findItem(fullId, 1)) {
			menu->addSeparator();
		}
	}
}

} // namespace AntiSpamMenu