/*
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) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "profile/profile_channel_controllers.h"

#include "boxes/peer_list_controllers.h"
#include "boxes/edit_participant_box.h"
#include "boxes/confirm_box.h"
#include "boxes/add_contact_box.h"
#include "core/tl_help.h"
#include "base/overload.h"
#include "auth_session.h"
#include "apiwrap.h"
#include "lang/lang_keys.h"
#include "mainwidget.h"
#include "observer_peer.h"
#include "dialogs/dialogs_indexed_list.h"
#include "data/data_peer_values.h"
#include "ui/widgets/popup_menu.h"
#include "window/window_controller.h"

namespace Profile {
namespace {

constexpr auto kParticipantsFirstPageCount = 16;
constexpr auto kParticipantsPerPage = 200;
constexpr auto kSortByOnlineDelay = TimeMs(1000);

} // namespace

ParticipantsBoxController::ParticipantsBoxController(
	not_null<Window::Navigation*> navigation,
	not_null<ChannelData*> channel,
	Role role)
: PeerListController(CreateSearchController(channel, role, &_additional))
, _navigation(navigation)
, _channel(channel)
, _role(role) {
	if (_channel->mgInfo) {
		_additional.creator = _channel->mgInfo->creator;
	}
	if (_role == Role::Profile) {
		setupSortByOnline();
		setupListChangeViewers();
	}
}

void ParticipantsBoxController::setupSortByOnline() {
	_sortByOnlineTimer.setCallback([this] { sortByOnline(); });
	using UpdateFlag = Notify::PeerUpdate::Flag;
	subscribe(Notify::PeerUpdated(), Notify::PeerUpdatedHandler(
		UpdateFlag::UserOnlineChanged,
		[this](const Notify::PeerUpdate &update) {
			if (auto row = delegate()->peerListFindRow(
					update.peer->id)) {
				row->refreshStatus();
				sortByOnlineDelayed();
			}
		}));
}

void ParticipantsBoxController::setupListChangeViewers() {
	if (!_channel->isMegagroup()) {
		return;
	}
	Auth().data().megagroupParticipantAdded(_channel)
		| rpl::start_with_next([this](not_null<UserData*> user) {
			if (delegate()->peerListFullRowsCount() > 0) {
				if (delegate()->peerListRowAt(0)->peer() == user) {
					return;
				}
			}
			if (auto row = delegate()->peerListFindRow(user->id)) {
				delegate()->peerListPartitionRows([user](const PeerListRow &row) {
					return (row.peer() == user);
				});
			} else {
				delegate()->peerListPrependRow(createRow(user));
				delegate()->peerListRefreshRows();
				sortByOnline();
			}
		}, lifetime());
	Auth().data().megagroupParticipantRemoved(_channel)
		| rpl::start_with_next([this](not_null<UserData*> user) {
			if (auto row = delegate()->peerListFindRow(user->id)) {
				delegate()->peerListRemoveRow(row);
			}
			delegate()->peerListRefreshRows();
		}, lifetime());
}

void ParticipantsBoxController::sortByOnlineDelayed() {
	if (!_sortByOnlineTimer.isActive()) {
		_sortByOnlineTimer.callOnce(kSortByOnlineDelay);
	}
}

void ParticipantsBoxController::sortByOnline() {
	if (_role != Role::Profile
		|| !_channel->isMegagroup()
		|| _channel->membersCount() > Global::ChatSizeMax()) {
		_onlineCount = 0;
		return;
	}
	auto now = unixtime();
	delegate()->peerListSortRows([now](
			const PeerListRow &a,
			const PeerListRow &b) {
		return Data::SortByOnlineValue(a.peer()->asUser(), now) >
			Data::SortByOnlineValue(b.peer()->asUser(), now);
	});
	refreshOnlineCount();
}

void ParticipantsBoxController::refreshOnlineCount() {
	Expects(_role == Role::Profile);
	Expects(_channel->membersCount() <= Global::ChatSizeMax());

	auto now = unixtime();
	auto left = 0, right = delegate()->peerListFullRowsCount();
	while (right > left) {
		auto middle = (left + right) / 2;
		auto row = delegate()->peerListRowAt(middle);
		if (Data::OnlineTextActive(row->peer()->asUser(), now)) {
			left = middle + 1;
		} else {
			right = middle;
		}
	}
	_onlineCount = left;
}

std::unique_ptr<PeerListSearchController>
ParticipantsBoxController::CreateSearchController(
		not_null<ChannelData*> channel,
		Role role,
		not_null<Additional*> additional) {
	// In admins box complex search is used for adding new admins.
	if (role != Role::Admins || channel->canAddAdmins()) {
		return std::make_unique<ParticipantsBoxSearchController>(
			channel,
			role,
			additional);
	}
	return nullptr;
}

void ParticipantsBoxController::Start(
		not_null<Window::Navigation*> navigation,
		not_null<ChannelData*> channel,
		Role role) {
	auto controller = std::make_unique<ParticipantsBoxController>(
		navigation,
		channel,
		role);
	auto initBox = [role, channel, controller = controller.get()](not_null<PeerListBox*> box) {
		box->addButton(langFactory(lng_close), [box] { box->closeBox(); });
		auto canAddNewItem = [role, channel] {
			switch (role) {
			case Role::Members: return !channel->isMegagroup() && channel->canAddMembers() && (channel->membersCount() < Global::ChatSizeMax());
			case Role::Admins: return channel->canAddAdmins();
			case Role::Restricted:
			case Role::Kicked: return channel->canBanMembers();
			}
			Unexpected("Role value in ParticipantsBoxController::Start()");
		};
		auto addNewItemText = [role] {
			switch (role) {
			case Role::Members: return langFactory(lng_channel_add_members);
			case Role::Admins: return langFactory(lng_channel_add_admin);
			case Role::Restricted: return langFactory(lng_channel_add_restricted);
			case Role::Kicked: return langFactory(lng_channel_add_banned);
			}
			Unexpected("Role value in ParticipantsBoxController::Start()");
		};
		if (canAddNewItem()) {
			box->addLeftButton(addNewItemText(), [controller] { controller->addNewItem(); });
		}
	};
	Ui::show(
		Box<PeerListBox>(std::move(controller), std::move(initBox)),
		LayerOption::KeepOther);
}

void ParticipantsBoxController::addNewItem() {
	Expects(_role != Role::Profile);

	if (_role == Role::Members) {
		if (_channel->membersCount() >= Global::ChatSizeMax()) {
			Ui::show(
				Box<MaxInviteBox>(_channel),
				LayerOption::KeepOther);
		} else {
			auto already = std::vector<not_null<UserData*>>();
			already.reserve(delegate()->peerListFullRowsCount());
			for (auto i = 0, count = delegate()->peerListFullRowsCount(); i != count; ++i) {
				already.push_back(delegate()->peerListRowAt(i)->peer()->asUser());
			}
			AddParticipantsBoxController::Start(_channel, { already.begin(), already.end() });
		}
		return;
	}
	auto weak = base::make_weak(this);
	_addBox = Ui::show(Box<PeerListBox>(std::make_unique<AddParticipantBoxController>(_channel, _role, [weak](not_null<UserData*> user, const MTPChannelAdminRights &rights) {
		if (const auto strong = weak.get()) {
			strong->editAdminDone(user, rights);
		}
	}, [weak](not_null<UserData*> user, const MTPChannelBannedRights &rights) {
		if (const auto strong = weak.get()) {
			strong->editRestrictedDone(user, rights);
		}
	}), [](not_null<PeerListBox*> box) {
		box->addButton(langFactory(lng_cancel), [box] { box->closeBox(); });
	}), LayerOption::KeepOther);
}

void ParticipantsBoxController::peerListSearchAddRow(not_null<PeerData*> peer) {
	PeerListController::peerListSearchAddRow(peer);
	if (_role == Role::Restricted && delegate()->peerListFullRowsCount() > 0) {
		setDescriptionText(QString());
	}
}

std::unique_ptr<PeerListRow> ParticipantsBoxController::createSearchRow(
		not_null<PeerData*> peer) {
	if (auto user = peer->asUser()) {
		return createRow(user);
	}
	return nullptr;
}

std::unique_ptr<PeerListRow> ParticipantsBoxController::createRestoredRow(
		not_null<PeerData*> peer) {
	if (auto user = peer->asUser()) {
		return createRow(user);
	}
	return nullptr;
}

std::unique_ptr<PeerListState> ParticipantsBoxController::saveState() const {
	Expects(_role == Role::Profile);

	auto result = PeerListController::saveState();

	auto my = std::make_unique<SavedState>();
	my->additional = _additional;
	my->offset = _offset;
	my->allLoaded = _allLoaded;
	my->wasLoading = (_loadRequestId != 0);
	if (auto search = searchController()) {
		my->searchState = search->saveState();
	}

	if (_channel->isMegagroup()) {
		auto weak = result.get();
		Auth().data().megagroupParticipantAdded(_channel)
			| rpl::start_with_next([weak](not_null<UserData*> user) {
				if (!weak->list.empty()) {
					if (weak->list[0] == user) {
						return;
					}
				}
				auto pos = ranges::find(weak->list, user);
				if (pos == weak->list.cend()) {
					weak->list.push_back(user);
				}
				ranges::stable_partition(
					weak->list,
					[user](auto peer) { return (peer == user); });
			}, my->lifetime);
		Auth().data().megagroupParticipantRemoved(_channel)
			| rpl::start_with_next([weak](not_null<UserData*> user) {
				weak->list.erase(std::remove(
					weak->list.begin(),
					weak->list.end(),
					user), weak->list.end());
				weak->filterResults.erase(std::remove(
					weak->filterResults.begin(),
					weak->filterResults.end(),
					user), weak->filterResults.end());
			}, my->lifetime);
	}
	result->controllerState = std::move(my);
	return result;
}

void ParticipantsBoxController::restoreState(
		std::unique_ptr<PeerListState> state) {
	auto typeErasedState = state
		? state->controllerState.get()
		: nullptr;
	if (auto my = dynamic_cast<SavedState*>(typeErasedState)) {
		if (auto requestId = base::take(_loadRequestId)) {
			request(requestId).cancel();
		}

		_additional = std::move(my->additional);
		_offset = my->offset;
		_allLoaded = my->allLoaded;
		if (auto search = searchController()) {
			search->restoreState(std::move(my->searchState));
		}
		if (my->wasLoading) {
			loadMoreRows();
		}
		PeerListController::restoreState(std::move(state));
		if (delegate()->peerListFullRowsCount() > 0) {
			setNonEmptyDescription();
		} else if (_allLoaded) {
			setDescriptionText(lang(lng_blocked_list_not_found));
		}
		sortByOnline();
	}
}

rpl::producer<int> ParticipantsBoxController::onlineCountValue() const {
	return _onlineCount.value();
}

template <typename Callback>
void ParticipantsBoxController::HandleParticipant(const MTPChannelParticipant &participant, Role role, not_null<Additional*> additional, Callback callback) {
	if ((role == Role::Profile
		|| role == Role::Members
		|| role == Role::Admins)
		&& participant.type() == mtpc_channelParticipantAdmin) {
		auto &admin = participant.c_channelParticipantAdmin();
		if (auto user = App::userLoaded(admin.vuser_id.v)) {
			additional->adminRights[user] = admin.vadmin_rights;
			if (admin.is_can_edit()) {
				additional->adminCanEdit.emplace(user);
			} else {
				additional->adminCanEdit.erase(user);
			}
			if (auto promoted = App::userLoaded(admin.vpromoted_by.v)) {
				auto it = additional->adminPromotedBy.find(user);
				if (it == additional->adminPromotedBy.end()) {
					additional->adminPromotedBy.emplace(user, promoted);
				} else {
					it->second = promoted;
				}
			} else {
				LOG(("API Error: No user %1 for admin promoted by.").arg(admin.vpromoted_by.v));
			}
			callback(user);
		}
	} else if ((role == Role::Profile
		|| role == Role::Members
		|| role == Role::Admins)
		&& participant.type() == mtpc_channelParticipantCreator) {
		auto &creator = participant.c_channelParticipantCreator();
		if (auto user = App::userLoaded(creator.vuser_id.v)) {
			additional->creator = user;
			callback(user);
		}
	} else if ((role == Role::Profile
		|| role == Role::Members
		|| role == Role::Restricted
		|| role == Role::Kicked)
		&& participant.type() == mtpc_channelParticipantBanned) {
		auto &banned = participant.c_channelParticipantBanned();
		if (auto user = App::userLoaded(banned.vuser_id.v)) {
			additional->restrictedRights[user] = banned.vbanned_rights;
			if (auto kickedby = App::userLoaded(banned.vkicked_by.v)) {
				auto it = additional->restrictedBy.find(user);
				if (it == additional->restrictedBy.end()) {
					additional->restrictedBy.emplace(user, kickedby);
				} else {
					it->second = kickedby;
				}
			}
			callback(user);
		}
	} else if ((role == Role::Profile
		|| role == Role::Members)
		&& participant.type() == mtpc_channelParticipant) {
		auto &member = participant.c_channelParticipant();
		if (auto user = App::userLoaded(member.vuser_id.v)) {
			callback(user);
		}
	} else if ((role == Role::Profile
		|| role == Role::Members)
		&& participant.type() == mtpc_channelParticipantSelf) {
		auto &member = participant.c_channelParticipantSelf();
		if (auto user = App::userLoaded(member.vuser_id.v)) {
			callback(user);
		}
	} else {
		LOG(("API Error: Bad participant type got while requesting for participants: %1").arg(participant.type()));
	}
}

void ParticipantsBoxController::prepare() {
	auto titleKey = [this] {
		switch (_role) {
		case Role::Admins: return lng_channel_admins;
		case Role::Profile:
		case Role::Members: return lng_profile_participants_section;
		case Role::Restricted: return lng_restricted_list_title;
		case Role::Kicked: return lng_banned_list_title;
		}
		Unexpected("Role in ParticipantsBoxController::prepare()");
	};
	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
	delegate()->peerListSetTitle(langFactory(titleKey()));
	setDescriptionText(lang(lng_contacts_loading));
	setSearchNoResultsText(lang(lng_blocked_list_not_found));

	loadMoreRows();
	delegate()->peerListRefreshRows();
}

void ParticipantsBoxController::loadMoreRows() {
	if (searchController() && searchController()->loadMoreRows()) {
		return;
	}
	if (_loadRequestId || _allLoaded) {
		return;
	}

	if (feedMegagroupLastParticipants()) {
		return;
	}

	auto filter = [this] {
		if (_role == Role::Members || _role == Role::Profile) {
			return MTP_channelParticipantsRecent();
		} else if (_role == Role::Admins) {
			return MTP_channelParticipantsAdmins();
		} else if (_role == Role::Restricted) {
			return MTP_channelParticipantsBanned(MTP_string(QString()));
		}
		return MTP_channelParticipantsKicked(MTP_string(QString()));
	}();

	// First query is small and fast, next loads a lot of rows.
	auto perPage = (_offset > 0) ? kParticipantsPerPage : kParticipantsFirstPageCount;
	auto participantsHash = 0;

	_loadRequestId = request(MTPchannels_GetParticipants(
		_channel->inputChannel,
		filter,
		MTP_int(_offset),
		MTP_int(perPage),
		MTP_int(participantsHash)
	)).done([this](const MTPchannels_ChannelParticipants &result) {
		auto firstLoad = !_offset;
		_loadRequestId = 0;

		auto wasRecentRequest = firstLoad
			&& (_role == Role::Members || _role == Role::Profile);
		auto parseParticipants = [&](auto &&result, auto &&callback) {
			if (wasRecentRequest) {
				Auth().api().parseRecentChannelParticipants(
					_channel,
					result,
					callback);
			} else {
				Auth().api().parseChannelParticipants(
					_channel,
					result,
					callback);
			}
		};
		parseParticipants(result, [&](
				int availableCount,
				const QVector<MTPChannelParticipant> &list) {
			for (auto &participant : list) {
				HandleParticipant(
					participant,
					_role,
					&_additional,
					[&](auto user) { appendRow(user); });
			}
			if (auto size = list.size()) {
				_offset += size;
			} else {
				// To be sure - wait for a whole empty result list.
				_allLoaded = true;
			}
		});

		if (delegate()->peerListFullRowsCount() > 0) {
			sortByOnline();
			if (firstLoad) {
				setNonEmptyDescription();
			}
		} else if (_allLoaded) {
			setDescriptionText(lang(lng_blocked_list_not_found));
		}
		delegate()->peerListRefreshRows();
	}).fail([this](const RPCError &error) {
		_loadRequestId = 0;
	}).send();
}

void ParticipantsBoxController::setNonEmptyDescription() {
	setDescriptionText((_role == Role::Kicked)
		? lang(lng_group_blocked_list_about)
		: QString());
}

bool ParticipantsBoxController::feedMegagroupLastParticipants() {
	if ((_role != Role::Members && _role != Role::Profile)
		|| delegate()->peerListFullRowsCount() > 0) {
		return false;
	}
	auto megagroup = _channel->asMegagroup();
	if (!megagroup) {
		return false;
	}
	auto info = megagroup->mgInfo.get();
	//
	// channelFull and channels_channelParticipants members count is desynced
	// so we almost always have LastParticipantsCountOutdated that is set
	// inside setMembersCount() and so we almost never use lastParticipants.
	//
	// => disable this check temporarily.
	//
	//if (info->lastParticipantsStatus != MegagroupInfo::LastParticipantsUpToDate) {
	//	_channel->updateFull();
	//	return false;
	//}
	if (info->lastParticipants.empty()) {
		return false;
	}

	if (info->creator) {
		_additional.creator = info->creator;
	}
	for_const (auto user, info->lastParticipants) {
		auto admin = info->lastAdmins.find(user);
		if (admin != info->lastAdmins.cend()) {
			_additional.restrictedRights.erase(user);
			if (admin->second.canEdit) {
				_additional.adminCanEdit.emplace(user);
			} else {
				_additional.adminCanEdit.erase(user);
			}
			_additional.adminRights.emplace(user, admin->second.rights);
		} else {
			_additional.adminCanEdit.erase(user);
			_additional.adminRights.erase(user);
			auto restricted = info->lastRestricted.find(user);
			if (restricted != info->lastRestricted.cend()) {
				_additional.restrictedRights.emplace(user, restricted->second.rights);
			} else {
				_additional.restrictedRights.erase(user);
			}
		}
		appendRow(user);

		//
		// Don't count lastParticipants in _offset, because we don't know
		// their exact information (admin / creator / restricted), they
		// could simply be added from the last messages authors.
		//
		//++_offset;
	}
	sortByOnline();
	return true;
}

void ParticipantsBoxController::rowClicked(not_null<PeerListRow*> row) {
	auto user = row->peer()->asUser();
	Expects(user != nullptr);

	if (_role == Role::Admins) {
		showAdmin(user);
	} else if (_role == Role::Restricted || _role == Role::Kicked) {
		showRestricted(user);
	} else {
		_navigation->showPeerInfo(row->peer());
	}
}

void ParticipantsBoxController::rowActionClicked(not_null<PeerListRow*> row) {
	auto user = row->peer()->asUser();
	Expects(user != nullptr);

	if (_role == Role::Members || _role == Role::Profile) {
		kickMember(user);
	} else if (_role == Role::Admins) {
		showAdmin(user);
	} else if (_role == Role::Restricted) {
		showRestricted(user);
	} else {
		removeKicked(row, user);
	}
}

bool ParticipantsBoxController::canEditAdminByRights(
		not_null<UserData*> user) const {
	if (_additional.adminCanEdit.find(user) != _additional.adminCanEdit.cend()) {
		return true;
	}
	return (user != _additional.creator);
}

bool ParticipantsBoxController::canEditAdmin(
		not_null<UserData*> user) const {
	if (user->isSelf()) {
		return false;
	} else if (_channel->amCreator()) {
		return true;
	} else if (!canEditAdminByRights(user)) {
		return false;
	}
	return _channel->adminRights() & ChannelAdminRight::f_add_admins;
}

bool ParticipantsBoxController::canRestrictUser(
		not_null<UserData*> user) const {
	if (user->isSelf()) {
		return false;
	} else if (_channel->amCreator()) {
		return true;
	} else if (!canEditAdminByRights(user)) {
		return false;
	}
	return _channel->adminRights() & ChannelAdminRight::f_ban_users;
}

Ui::PopupMenu *ParticipantsBoxController::rowContextMenu(
		not_null<PeerListRow*> row) {
	Expects(row->peer()->isUser());

	auto user = row->peer()->asUser();
	auto result = new Ui::PopupMenu(nullptr);
	result->addAction(
		lang(lng_context_view_profile),
		[weak = base::make_weak(this), user] {
			if (const auto strong = weak.get()) {
				strong->_navigation->showPeerInfo(user);
			}
		});
	if (canEditAdmin(user)) {
		auto it = _additional.adminRights.find(user);
		auto isCreator = (user == _additional.creator);
		auto notAdmin = !isCreator && (it == _additional.adminRights.cend());
		auto label = lang(notAdmin
			? lng_context_promote_admin
			: lng_context_edit_permissions);
		result->addAction(
			label,
			[weak = base::make_weak(this), user] {
				if (const auto strong = weak.get()) {
					strong->showAdmin(user);
				}
			});
	}
	if (canRestrictUser(user)) {
		auto isGroup = _channel->isMegagroup();
		if (isGroup) {
			result->addAction(
				lang(lng_context_restrict_user),
				[weak = base::make_weak(this), user]{
					if (const auto strong = weak.get()) {
						strong->showRestricted(user);
					}
				});
		}
		result->addAction(
			lang(isGroup
				? lng_context_remove_from_group
				: lng_profile_kick),
			[weak = base::make_weak(this), user] {
				if (auto strong = weak.get()) {
					strong->kickMember(user);
				}
			});
	}
	return result;
}

void ParticipantsBoxController::showAdmin(not_null<UserData*> user) {
	auto it = _additional.adminRights.find(user);
	auto isCreator = (user == _additional.creator);
	auto notAdmin = !isCreator && (it == _additional.adminRights.cend());
	auto currentRights = isCreator
		? MTP_channelAdminRights(MTP_flags(~MTPDchannelAdminRights::Flag::f_add_admins | MTPDchannelAdminRights::Flag::f_add_admins))
		: notAdmin ? MTP_channelAdminRights(MTP_flags(0)) : it->second;
	auto weak = base::make_weak(this);
	auto box = Box<EditAdminBox>(_channel, user, currentRights);
	auto canEdit = (_additional.adminCanEdit.find(user) != _additional.adminCanEdit.end());
	auto canSave = notAdmin ? _channel->canAddAdmins() : canEdit;
	if (canSave) {
		box->setSaveCallback([channel = _channel.get(), user, weak](const MTPChannelAdminRights &oldRights, const MTPChannelAdminRights &newRights) {
			MTP::send(MTPchannels_EditAdmin(channel->inputChannel, user->inputUser, newRights), rpcDone([channel, user, weak, oldRights, newRights](const MTPUpdates &result) {
				Auth().api().applyUpdates(result);
				channel->applyEditAdmin(user, oldRights, newRights);
				if (weak) {
					weak->editAdminDone(user, newRights);
				}
			}));
		});
	}
	_editBox = Ui::show(std::move(box), LayerOption::KeepOther);
}

void ParticipantsBoxController::editAdminDone(
		not_null<UserData*> user,
		const MTPChannelAdminRights &rights) {
	if (_editBox) {
		_editBox->closeBox();
	}
	if (_addBox) {
		_addBox->closeBox();
	}
	auto notAdmin = (rights.c_channelAdminRights().vflags.v == 0);
	if (notAdmin) {
		_additional.adminRights.erase(user);
		_additional.adminPromotedBy.erase(user);
		_additional.adminCanEdit.erase(user);
		if (_role == Role::Admins) {
			removeRow(user);
		}
	} else {
		// It won't be replaced if the entry already exists.
		_additional.adminPromotedBy.emplace(user, App::self());
		_additional.adminCanEdit.emplace(user);
		_additional.adminRights[user] = rights;
		_additional.kicked.erase(user);
		_additional.restrictedRights.erase(user);
		_additional.restrictedBy.erase(user);
		if (_role == Role::Admins) {
			prependRow(user);
		} else if (_role == Role::Kicked || _role == Role::Restricted) {
			removeRow(user);
		}
	}
	recomputeTypeFor(user);
	delegate()->peerListRefreshRows();
}

void ParticipantsBoxController::showRestricted(not_null<UserData*> user) {
	auto it = _additional.restrictedRights.find(user);
	auto restrictedRights = (it == _additional.restrictedRights.cend())
		? MTP_channelBannedRights(MTP_flags(0), MTP_int(0))
		: it->second;
	auto weak = base::make_weak(this);
	auto hasAdminRights = false;
	auto box = Box<EditRestrictedBox>(_channel, user, hasAdminRights, restrictedRights);
	if (_channel->canBanMembers()) {
		box->setSaveCallback([megagroup = _channel.get(), user, weak](const MTPChannelBannedRights &oldRights, const MTPChannelBannedRights &newRights) {
			MTP::send(MTPchannels_EditBanned(megagroup->inputChannel, user->inputUser, newRights), rpcDone([megagroup, user, weak, oldRights, newRights](const MTPUpdates &result) {
				Auth().api().applyUpdates(result);
				megagroup->applyEditBanned(user, oldRights, newRights);
				if (weak) {
					weak->editRestrictedDone(user, newRights);
				}
			}));
		});
	}
	_editBox = Ui::show(std::move(box), LayerOption::KeepOther);
}

void ParticipantsBoxController::editRestrictedDone(not_null<UserData*> user, const MTPChannelBannedRights &rights) {
	if (_editBox) {
		_editBox->closeBox();
	}
	if (_addBox) {
		_addBox->closeBox();
	}
	auto notBanned = (rights.c_channelBannedRights().vflags.v == 0);
	auto fullBanned = rights.c_channelBannedRights().is_view_messages();
	if (notBanned) {
		_additional.kicked.erase(user);
		_additional.restrictedRights.erase(user);
		_additional.restrictedBy.erase(user);
		if (_role == Role::Kicked || _role == Role::Restricted) {
			removeRow(user);
		}
	} else {
		_additional.adminRights.erase(user);
		_additional.adminCanEdit.erase(user);
		_additional.adminPromotedBy.erase(user);
		_additional.restrictedBy.emplace(user, App::self());
		if (fullBanned) {
			_additional.kicked.emplace(user);
			_additional.restrictedRights.erase(user);
			if (_role == Role::Kicked) {
				prependRow(user);
			} else if (_role == Role::Admins
				|| _role == Role::Restricted
				|| _role == Role::Members) {
				removeRow(user);
			}
		} else {
			_additional.restrictedRights[user] = rights;
			_additional.kicked.erase(user);
			if (_role == Role::Restricted) {
				prependRow(user);
			} else if (_role == Role::Kicked
				|| _role == Role::Admins
				|| _role == Role::Members) {
				removeRow(user);
			}
		}
	}
	recomputeTypeFor(user);
	delegate()->peerListRefreshRows();
}

void ParticipantsBoxController::kickMember(not_null<UserData*> user) {
	auto text = (_channel->isMegagroup() ? lng_profile_sure_kick : lng_profile_sure_kick_channel)(lt_user, user->firstName);
	auto weak = base::make_weak(this);
	_editBox = Ui::show(Box<ConfirmBox>(text, lang(lng_box_remove), [weak, user] {
		if (const auto strong = weak.get()) {
			strong->kickMemberSure(user);
		}
	}), LayerOption::KeepOther);
}

void ParticipantsBoxController::kickMemberSure(not_null<UserData*> user) {
	if (_editBox) {
		_editBox->closeBox();
	}
	auto alreadyIt = _additional.restrictedRights.find(user);
	auto currentRights = (alreadyIt == _additional.restrictedRights.cend()) ? MTP_channelBannedRights(MTP_flags(0), MTP_int(0)) : alreadyIt->second;

	if (auto row = delegate()->peerListFindRow(user->id)) {
		delegate()->peerListRemoveRow(row);
		delegate()->peerListRefreshRows();
	}
	Auth().api().kickParticipant(_channel, user, currentRights);
}

void ParticipantsBoxController::removeKicked(not_null<PeerListRow*> row, not_null<UserData*> user) {
	delegate()->peerListRemoveRow(row);
	delegate()->peerListRefreshRows();

	Auth().api().unblockParticipant(_channel, user);
}

bool ParticipantsBoxController::appendRow(not_null<UserData*> user) {
	if (delegate()->peerListFindRow(user->id)) {
		recomputeTypeFor(user);
		return false;
	}
	delegate()->peerListAppendRow(createRow(user));
	if (_role != Role::Kicked) {
		setDescriptionText(QString());
	}
	return true;
}

bool ParticipantsBoxController::prependRow(not_null<UserData*> user) {
	if (auto row = delegate()->peerListFindRow(user->id)) {
		recomputeTypeFor(user);
		refreshCustomStatus(row);
		if (_role == Role::Admins) {
			// Perhaps we've added a new admin from search.
			delegate()->peerListPrependRowFromSearchResult(row);
		}
		return false;
	}
	delegate()->peerListPrependRow(createRow(user));
	if (_role != Role::Kicked) {
		setDescriptionText(QString());
	}
	return true;
}

bool ParticipantsBoxController::removeRow(not_null<UserData*> user) {
	if (auto row = delegate()->peerListFindRow(user->id)) {
		if (_role == Role::Admins) {
			// Perhaps we are removing an admin from search results.
			row->setCustomStatus(lang(lng_channel_admin_status_not_admin));
			delegate()->peerListConvertRowToSearchResult(row);
		} else {
			delegate()->peerListRemoveRow(row);
		}
		if (_role != Role::Kicked
			&& !delegate()->peerListFullRowsCount()) {
			setDescriptionText(lang(lng_blocked_list_not_found));
		}
		return true;
	}
	return false;
}

std::unique_ptr<PeerListRow> ParticipantsBoxController::createRow(
		not_null<UserData*> user) const {
	if (_role == Role::Profile) {
		return std::make_unique<Row>(user, computeType(user));
	}
	auto row = std::make_unique<PeerListRowWithLink>(user);
	refreshCustomStatus(row.get());
	if (_role == Role::Restricted || (_role == Role::Admins && _additional.adminCanEdit.find(user) != _additional.adminCanEdit.cend())) {
//		row->setActionLink(lang(lng_profile_edit_permissions));
	} else if (_role == Role::Kicked) {
		row->setActionLink(lang(lng_blocked_list_unblock));
	} else if (_role == Role::Members) {
		if (_channel->canBanMembers() && _additional.creator != user
			&& (_additional.adminRights.find(user) == _additional.adminRights.cend()
				|| _additional.adminCanEdit.find(user) != _additional.adminCanEdit.cend())) {
			row->setActionLink(lang(lng_profile_kick));
		}
	}
	return std::move(row);
}

auto ParticipantsBoxController::computeType(
		not_null<UserData*> user) const -> Type {
	auto isCreator = (user == _additional.creator);
	auto isAdmin = (_additional.adminRights.find(user) != _additional.adminRights.cend());

	auto result = Type();
	result.rights = isCreator
		? Rights::Creator
		: isAdmin
		? Rights::Admin
		: Rights::Normal;
	result.canRemove = canRestrictUser(user);
	return result;
}

void ParticipantsBoxController::recomputeTypeFor(
		not_null<UserData*> user) {
	if (_role != Role::Profile) {
		return;
	}
	if (auto row = delegate()->peerListFindRow(user->id)) {
		static_cast<Row*>(row)->setType(computeType(user));
	}
}

void ParticipantsBoxController::refreshCustomStatus(not_null<PeerListRow*> row) const {
	auto user = row->peer()->asUser();
	if (_role == Role::Admins) {
		auto promotedBy = _additional.adminPromotedBy.find(user);
		if (promotedBy == _additional.adminPromotedBy.cend()) {
			if (user == _additional.creator) {
				row->setCustomStatus(lang(lng_channel_admin_status_creator));
			} else {
				row->setCustomStatus(lang(lng_channel_admin_status_not_admin));
			}
		} else {
			row->setCustomStatus(lng_channel_admin_status_promoted_by(lt_user, App::peerName(promotedBy->second)));
		}
	} else if (_role == Role::Kicked || _role == Role::Restricted) {
		auto restrictedBy = _additional.restrictedBy.find(user);
		if (restrictedBy == _additional.restrictedBy.cend()) {
			row->setCustomStatus(lng_channel_banned_status_restricted_by(lt_user, "Unknown"));
		} else {
			row->setCustomStatus(lng_channel_banned_status_restricted_by(lt_user, App::peerName(restrictedBy->second)));
		}
	}
}

ParticipantsBoxSearchController::ParticipantsBoxSearchController(not_null<ChannelData*> channel, Role role, not_null<Additional*> additional)
: _channel(channel)
, _role(role)
, _additional(additional) {
	_timer.setCallback([this] { searchOnServer(); });
}

void ParticipantsBoxSearchController::searchQuery(const QString &query) {
	if (_query != query) {
		_query = query;
		_offset = 0;
		_requestId = 0;
		_allLoaded = false;
		if (!_query.isEmpty() && !searchInCache()) {
			_timer.callOnce(AutoSearchTimeout);
		} else {
			_timer.cancel();
		}
	}
}

auto ParticipantsBoxSearchController::saveState() const
-> std::unique_ptr<SavedStateBase> {
	auto result = std::make_unique<SavedState>();
	result->query = _query;
	result->offset = _offset;
	result->allLoaded = _allLoaded;
	result->wasLoading = (_requestId != 0);
	return std::move(result);
}

void ParticipantsBoxSearchController::restoreState(
		std::unique_ptr<SavedStateBase> state) {
	if (auto my = dynamic_cast<SavedState*>(state.get())) {
		if (auto requestId = base::take(_requestId)) {
			request(requestId).cancel();
		}
		_cache.clear();
		_queries.clear();

		_allLoaded = my->allLoaded;
		_offset = my->offset;
		_query = my->query;
		if (my->wasLoading) {
			searchOnServer();
		}
	}
}

void ParticipantsBoxSearchController::searchOnServer() {
	Expects(!_query.isEmpty());
	loadMoreRows();
}

bool ParticipantsBoxSearchController::isLoading() {
	return _timer.isActive() || _requestId;
}

bool ParticipantsBoxSearchController::searchInCache() {
	auto it = _cache.find(_query);
	if (it != _cache.cend()) {
		_requestId = 0;
		searchDone(_requestId, it->second.result, it->second.requestedCount);
		return true;
	}
	return false;
}

bool ParticipantsBoxSearchController::loadMoreRows() {
	if (_query.isEmpty()) {
		return false;
	}
	if (!_allLoaded && !isLoading()) {
		auto filter = [this] {
			switch (_role) {
			case Role::Admins: // Search for members, appoint as admin on found.
			case Role::Profile:
			case Role::Members: return MTP_channelParticipantsSearch(MTP_string(_query));
			case Role::Restricted: return MTP_channelParticipantsBanned(MTP_string(_query));
			case Role::Kicked: return MTP_channelParticipantsKicked(MTP_string(_query));
			}
			Unexpected("Role in ParticipantsBoxSearchController::loadMoreRows()");
		}();

		// For search we request a lot of rows from the first query.
		// (because we've waited for search request by timer already,
		// so we don't expect it to be fast, but we want to fill cache).
		auto perPage = kParticipantsPerPage;
		auto participantsHash = 0;

		_requestId = request(MTPchannels_GetParticipants(
			_channel->inputChannel,
			filter,
			MTP_int(_offset),
			MTP_int(perPage),
			MTP_int(participantsHash)
		)).done([this, perPage](const MTPchannels_ChannelParticipants &result, mtpRequestId requestId) {
			searchDone(requestId, result, perPage);
		}).fail([this](const RPCError &error, mtpRequestId requestId) {
			if (_requestId == requestId) {
				_requestId = 0;
				_allLoaded = true;
				delegate()->peerListSearchRefreshRows();
			}
		}).send();

		auto entry = Query();
		entry.text = _query;
		entry.offset = _offset;
		_queries.emplace(_requestId, entry);
	}
	return true;
}

void ParticipantsBoxSearchController::searchDone(
		mtpRequestId requestId,
		const MTPchannels_ChannelParticipants &result,
		int requestedCount) {
	auto query = _query;
	if (requestId) {
		Auth().api().parseChannelParticipants(_channel, result, [&](auto&&...) {
			auto it = _queries.find(requestId);
			if (it != _queries.cend()) {
				query = it->second.text;
				if (it->second.offset == 0) {
					auto &entry = _cache[query];
					entry.result = result;
					entry.requestedCount = requestedCount;
				}
				_queries.erase(it);
			}
		});
	}

	if (_requestId != requestId) {
		return;
	}

	_requestId = 0;
	TLHelp::VisitChannelParticipants(result, base::overload([&](
			const MTPDchannels_channelParticipants &data) {
		auto &list = data.vparticipants.v;
		if (list.size() < requestedCount) {
			// We want cache to have full information about a query with small
			// results count (if we don't need the second request). So we don't
			// wait for an empty results list unlike the non-search peer list.
			_allLoaded = true;
		}
		auto parseRole = (_role == Role::Admins) ? Role::Members : _role;
		for_const (auto &participant, list) {
			ParticipantsBoxController::HandleParticipant(participant, parseRole, _additional, [this](not_null<UserData*> user) {
				delegate()->peerListSearchAddRow(user);
			});
		}
		_offset += list.size();
	}, [&](mtpTypeId type) {
		_allLoaded = true;
	}));

	delegate()->peerListSearchRefreshRows();
}

AddParticipantBoxController::AddParticipantBoxController(not_null<ChannelData*> channel, Role role, AdminDoneCallback adminDoneCallback, BannedDoneCallback bannedDoneCallback) : PeerListController(std::make_unique<AddParticipantBoxSearchController>(channel, &_additional))
, _channel(channel)
, _role(role)
, _adminDoneCallback(std::move(adminDoneCallback))
, _bannedDoneCallback(std::move(bannedDoneCallback)) {
	if (_channel->mgInfo) {
		_additional.creator = _channel->mgInfo->creator;
	}
}

std::unique_ptr<PeerListRow> AddParticipantBoxController::createSearchRow(not_null<PeerData*> peer) {
	if (peer->isSelf()) {
		return nullptr;
	}
	if (auto user = peer->asUser()) {
		return createRow(user);
	}
	return nullptr;
}

void AddParticipantBoxController::prepare() {
	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
	auto title = [this] {
		switch (_role) {
		case Role::Admins: return langFactory(lng_channel_add_admin);
		case Role::Restricted: return langFactory(lng_channel_add_restricted);
		case Role::Kicked: return langFactory(lng_channel_add_banned);
		}
		Unexpected("Role in AddParticipantBoxController::prepare()");
	};
	delegate()->peerListSetTitle(title());
	setDescriptionText(lang(lng_contacts_loading));
	setSearchNoResultsText(lang(lng_blocked_list_not_found));
	delegate()->peerListRefreshRows();

	loadMoreRows();
}

void AddParticipantBoxController::loadMoreRows() {
	if (searchController() && searchController()->loadMoreRows()) {
		return;
	}
	if (_loadRequestId || _allLoaded) {
		return;
	}

	// First query is small and fast, next loads a lot of rows.
	auto perPage = (_offset > 0) ? kParticipantsPerPage : kParticipantsFirstPageCount;
	auto participantsHash = 0;

	_loadRequestId = request(MTPchannels_GetParticipants(
		_channel->inputChannel,
		MTP_channelParticipantsRecent(),
		MTP_int(_offset),
		MTP_int(perPage),
		MTP_int(participantsHash)
	)).done([this](const MTPchannels_ChannelParticipants &result) {
		_loadRequestId = 0;

		Auth().api().parseChannelParticipants(_channel, result, [&](
				int availableCount,
				const QVector<MTPChannelParticipant> &list) {
			for (auto &participant : list) {
				HandleParticipant(
					participant,
					&_additional,
					[this](auto user) { appendRow(user); });
			}
			if (auto size = list.size()) {
				_offset += size;
			} else {
				// To be sure - wait for a whole empty result list.
				_allLoaded = true;
			}
		});

		if (delegate()->peerListFullRowsCount() > 0) {
			setDescriptionText(QString());
		} else if (_allLoaded) {
			setDescriptionText(lang(lng_blocked_list_not_found));
		}
		delegate()->peerListRefreshRows();
	}).fail([this](const RPCError &error) {
		_loadRequestId = 0;
	}).send();
}

void AddParticipantBoxController::rowClicked(not_null<PeerListRow*> row) {
	auto user = row->peer()->asUser();
	switch (_role) {
	case Role::Admins: return showAdmin(user);
	case Role::Restricted: return showRestricted(user);
	case Role::Kicked: return kickUser(user);
	}
	Unexpected("Role in AddParticipantBoxController::rowClicked()");
}

template <typename Callback>
bool AddParticipantBoxController::checkInfoLoaded(not_null<UserData*> user, Callback callback) {
	if (_additional.infoNotLoaded.find(user) == _additional.infoNotLoaded.end()) {
		return true;
	}

	// We don't know what this user status is in the group.
	request(MTPchannels_GetParticipant(_channel->inputChannel, user->inputUser)).done([this, user, callback](const MTPchannels_ChannelParticipant &result) {
		Expects(result.type() == mtpc_channels_channelParticipant);
		auto &participant = result.c_channels_channelParticipant();
		App::feedUsers(participant.vusers);
		HandleParticipant(participant.vparticipant, &_additional, [](not_null<UserData*>) {});
		_additional.infoNotLoaded.erase(user);
		callback();
	}).fail([this, user, callback](const RPCError &error) {
		_additional.infoNotLoaded.erase(user);
		_additional.external.emplace(user);
		callback();
	}).send();
	return false;
}

void AddParticipantBoxController::showAdmin(not_null<UserData*> user, bool sure) {
	if (!checkInfoLoaded(user, [this, user] { showAdmin(user); })) {
		return;
	}

	if (sure && _editBox) {
		// Close the confirmation box.
		_editBox->closeBox();
	}

	// Check restrictions.
	auto weak = base::make_weak(this);
	auto alreadyIt = _additional.adminRights.find(user);
	auto currentRights = (_additional.creator == user)
		? MTP_channelAdminRights(MTP_flags(~MTPDchannelAdminRights::Flag::f_add_admins | MTPDchannelAdminRights::Flag::f_add_admins))
		: MTP_channelAdminRights(MTP_flags(0));
	if (alreadyIt != _additional.adminRights.end()) {
		// The user is already an admin.
		currentRights = alreadyIt->second;
	} else if (_additional.kicked.find(user) != _additional.kicked.end()) {
		// The user is banned.
		if (_channel->canAddMembers()) {
			if (_channel->canBanMembers()) {
				if (!sure) {
					_editBox = Ui::show(Box<ConfirmBox>(lang(lng_sure_add_admin_unban), [weak, user] {
						if (weak) {
							weak->showAdmin(user, true);
						}
					}), LayerOption::KeepOther);
					return;
				}
			} else {
				Ui::show(Box<InformBox>(
					lang(lng_error_cant_add_admin_unban)),
					LayerOption::KeepOther);
				return;
			}
		} else {
			Ui::show(Box<InformBox>(
				lang(lng_error_cant_add_admin_invite)),
				LayerOption::KeepOther);
			return;
		}
	} else if (_additional.restrictedRights.find(user) != _additional.restrictedRights.end()) {
		// The user is restricted.
		if (_channel->canBanMembers()) {
			if (!sure) {
				_editBox = Ui::show(Box<ConfirmBox>(lang(lng_sure_add_admin_unban), [weak, user] {
					if (weak) {
						weak->showAdmin(user, true);
					}
				}), LayerOption::KeepOther);
				return;
			}
		} else {
			Ui::show(Box<InformBox>(
				lang(lng_error_cant_add_admin_unban)),
				LayerOption::KeepOther);
			return;
		}
	} else if (_additional.external.find(user) != _additional.external.end()) {
		// The user is not in the group yet.
		if (_channel->canAddMembers()) {
			if (!sure) {
				_editBox = Ui::show(Box<ConfirmBox>(lang(lng_sure_add_admin_invite), [weak, user] {
					if (weak) {
						weak->showAdmin(user, true);
					}
				}), LayerOption::KeepOther);
				return;
			}
		} else {
			Ui::show(
				Box<InformBox>(lang(lng_error_cant_add_admin_invite)),
				LayerOption::KeepOther);
			return;
		}
	}

	// Finally show the admin.
	auto canNotEdit = (_additional.creator == user)
		|| ((alreadyIt != _additional.adminRights.end())
			&& (_additional.adminCanEdit.find(user) == _additional.adminCanEdit.end()));
	auto box = Box<EditAdminBox>(_channel, user, currentRights);
	if (!canNotEdit) {
		box->setSaveCallback([channel = _channel.get(), user, weak](const MTPChannelAdminRights &oldRights, const MTPChannelAdminRights &newRights) {
			MTP::send(MTPchannels_EditAdmin(channel->inputChannel, user->inputUser, newRights), rpcDone([channel, user, weak, oldRights, newRights](const MTPUpdates &result) {
				Auth().api().applyUpdates(result);
				channel->applyEditAdmin(user, oldRights, newRights);
				if (weak) {
					weak->editAdminDone(user, newRights);
				}
			}), rpcFail([channel, weak](const RPCError &error) {
				if (MTP::isDefaultHandledError(error)) {
					return false;
				}
				if (error.type() == qstr("USER_NOT_MUTUAL_CONTACT")) {
					Ui::show(
						Box<InformBox>(PeerFloodErrorText(
							channel->isMegagroup()
								? PeerFloodType::InviteGroup
								: PeerFloodType::InviteChannel)),
						LayerOption::KeepOther);
				} else if (error.type() == qstr("BOT_GROUPS_BLOCKED")) {
					Ui::show(
						Box<InformBox>(lang(lng_error_cant_add_bot)),
						LayerOption::KeepOther);
				}
				if (weak && weak->_editBox) {
					weak->_editBox->closeBox();
				}
				return true;
			}));
		});
	}
	_editBox = Ui::show(std::move(box), LayerOption::KeepOther);
}

void AddParticipantBoxController::editAdminDone(
		not_null<UserData*> user,
		const MTPChannelAdminRights &rights) {
	if (_editBox) _editBox->closeBox();
	_additional.restrictedRights.erase(user);
	_additional.restrictedBy.erase(user);
	_additional.kicked.erase(user);
	_additional.external.erase(user);
	if (rights.c_channelAdminRights().vflags.v == 0) {
		_additional.adminRights.erase(user);
		_additional.adminPromotedBy.erase(user);
		_additional.adminCanEdit.erase(user);
	} else {
		_additional.adminRights[user] = rights;
		_additional.adminCanEdit.emplace(user);
		auto it = _additional.adminPromotedBy.find(user);
		if (it == _additional.adminPromotedBy.end()) {
			_additional.adminPromotedBy.emplace(user, App::self());
		}
	}
	if (_adminDoneCallback) {
		_adminDoneCallback(user, rights);
	}
}

void AddParticipantBoxController::showRestricted(not_null<UserData*> user, bool sure) {
	if (!checkInfoLoaded(user, [this, user] { showRestricted(user); })) {
		return;
	}

	if (sure && _editBox) {
		// Close the confirmation box.
		_editBox->closeBox();
	}

	// Check restrictions.
	auto weak = base::make_weak(this);
	auto alreadyIt = _additional.restrictedRights.find(user);
	auto currentRights = MTP_channelBannedRights(MTP_flags(0), MTP_int(0));
	auto hasAdminRights = false;
	if (alreadyIt != _additional.restrictedRights.end()) {
		// The user is already banned or restricted.
		currentRights = alreadyIt->second;
	} else if (_additional.adminRights.find(user) != _additional.adminRights.end() || _additional.creator == user) {
		// The user is an admin or creator.
		if (_additional.adminCanEdit.find(user) != _additional.adminCanEdit.end()) {
			hasAdminRights = true;
			if (!sure) {
				_editBox = Ui::show(Box<ConfirmBox>(lang(lng_sure_ban_admin), [weak, user] {
					if (weak) {
						weak->showRestricted(user, true);
					}
				}), LayerOption::KeepOther);
				return;
			}
		} else {
			Ui::show(
				Box<InformBox>(lang(lng_error_cant_ban_admin)),
				LayerOption::KeepOther);
			return;
		}
	}

	// Finally edit the restricted.
	auto box = Box<EditRestrictedBox>(_channel, user, hasAdminRights, currentRights);
	box->setSaveCallback([user, weak](const MTPChannelBannedRights &oldRights, const MTPChannelBannedRights &newRights) {
		if (weak) {
			weak->restrictUserSure(user, oldRights, newRights);
		}
	});
	_editBox = Ui::show(std::move(box), LayerOption::KeepOther);
}

void AddParticipantBoxController::restrictUserSure(not_null<UserData*> user, const MTPChannelBannedRights &oldRights, const MTPChannelBannedRights &newRights) {
	auto weak = base::make_weak(this);
	MTP::send(MTPchannels_EditBanned(_channel->inputChannel, user->inputUser, newRights), rpcDone([megagroup = _channel.get(), user, weak, oldRights, newRights](const MTPUpdates &result) {
		Auth().api().applyUpdates(result);
		megagroup->applyEditBanned(user, oldRights, newRights);
		if (const auto strong = weak.get()) {
			strong->editRestrictedDone(user, newRights);
		}
	}));
}

void AddParticipantBoxController::editRestrictedDone(
		not_null<UserData*> user,
		const MTPChannelBannedRights &rights) {
	if (_editBox) _editBox->closeBox();
	_additional.adminRights.erase(user);
	_additional.adminCanEdit.erase(user);
	_additional.adminPromotedBy.erase(user);
	if (rights.c_channelBannedRights().vflags.v == 0) {
		_additional.restrictedRights.erase(user);
		_additional.restrictedBy.erase(user);
		_additional.kicked.erase(user);
	} else {
		_additional.restrictedRights[user] = rights;
		if (rights.c_channelBannedRights().vflags.v & MTPDchannelBannedRights::Flag::f_view_messages) {
			_additional.kicked.emplace(user);
		} else {
			_additional.kicked.erase(user);
		}
		_additional.restrictedBy.emplace(user, App::self());
	}
	if (_bannedDoneCallback) {
		_bannedDoneCallback(user, rights);
	}
}

void AddParticipantBoxController::kickUser(not_null<UserData*> user, bool sure) {
	if (!checkInfoLoaded(user, [this, user] { kickUser(user); })) {
		return;
	}

	// Check restrictions.
	auto weak = base::make_weak(this);
	if (_additional.adminRights.find(user) != _additional.adminRights.end() || _additional.creator == user) {
		// The user is an admin or creator.
		if (_additional.adminCanEdit.find(user) != _additional.adminCanEdit.end()) {
			if (!sure) {
				_editBox = Ui::show(Box<ConfirmBox>(lang(lng_sure_ban_admin), [weak, user] {
					if (weak) {
						weak->kickUser(user, true);
					}
				}), LayerOption::KeepOther);
				return;
			}
		} else {
			Ui::show(
				Box<InformBox>(lang(lng_error_cant_ban_admin)),
				LayerOption::KeepOther);
			return;
		}
	}

	// Finally kick him.
	if (!sure) {
		auto text = lng_sure_ban_user_group(lt_user, App::peerName(user));
		_editBox = Ui::show(Box<ConfirmBox>(text, [weak, user] {
			if (weak) {
				weak->kickUser(user, true);
			}
		}), LayerOption::KeepOther);
		return;
	}
	auto currentRights = MTP_channelBannedRights(MTP_flags(0), MTP_int(0));
	auto alreadyIt = _additional.restrictedRights.find(user);
	if (alreadyIt != _additional.restrictedRights.end()) {
		// The user is already banned or restricted.
		currentRights = alreadyIt->second;
	}
	restrictUserSure(user, currentRights, ChannelData::KickedRestrictedRights());
}

bool AddParticipantBoxController::appendRow(not_null<UserData*> user) {
	if (delegate()->peerListFindRow(user->id) || user->isSelf()) {
		return false;
	}
	delegate()->peerListAppendRow(createRow(user));
	return true;
}

bool AddParticipantBoxController::prependRow(not_null<UserData*> user) {
	if (delegate()->peerListFindRow(user->id)) {
		return false;
	}
	delegate()->peerListPrependRow(createRow(user));
	return true;
}

std::unique_ptr<PeerListRow> AddParticipantBoxController::createRow(not_null<UserData*> user) const {
	return std::make_unique<PeerListRow>(user);
}

template <typename Callback>
void AddParticipantBoxController::HandleParticipant(
		const MTPChannelParticipant &participant,
		not_null<Additional*> additional,
		Callback callback) {
	switch (participant.type()) {
	case mtpc_channelParticipantAdmin: {
		auto &admin = participant.c_channelParticipantAdmin();
		if (auto user = App::userLoaded(admin.vuser_id.v)) {
			additional->infoNotLoaded.erase(user);
			additional->restrictedRights.erase(user);
			additional->kicked.erase(user);
			additional->restrictedBy.erase(user);
			additional->adminRights[user] = admin.vadmin_rights;
			if (admin.is_can_edit()) {
				additional->adminCanEdit.emplace(user);
			} else {
				additional->adminCanEdit.erase(user);
			}
			if (auto promoted = App::userLoaded(admin.vpromoted_by.v)) {
				auto it = additional->adminPromotedBy.find(user);
				if (it == additional->adminPromotedBy.end()) {
					additional->adminPromotedBy.emplace(user, promoted);
				} else {
					it->second = promoted;
				}
			} else {
				LOG(("API Error: No user %1 for admin promoted by.").arg(admin.vpromoted_by.v));
			}
			callback(user);
		}
	} break;
	case mtpc_channelParticipantCreator: {
		auto &creator = participant.c_channelParticipantCreator();
		if (auto user = App::userLoaded(creator.vuser_id.v)) {
			additional->infoNotLoaded.erase(user);
			additional->creator = user;
			callback(user);
		}
	} break;
	case mtpc_channelParticipantBanned: {
		auto &banned = participant.c_channelParticipantBanned();
		if (auto user = App::userLoaded(banned.vuser_id.v)) {
			additional->infoNotLoaded.erase(user);
			additional->adminRights.erase(user);
			additional->adminCanEdit.erase(user);
			additional->adminPromotedBy.erase(user);
			if (banned.is_left()) {
				additional->kicked.emplace(user);
			} else {
				additional->kicked.erase(user);
			}
			additional->restrictedRights[user] = banned.vbanned_rights;
			if (auto kickedby = App::userLoaded(banned.vkicked_by.v)) {
				auto it = additional->restrictedBy.find(user);
				if (it == additional->restrictedBy.end()) {
					additional->restrictedBy.emplace(user, kickedby);
				} else {
					it->second = kickedby;
				}
			}
			callback(user);
		}
	} break;
	case mtpc_channelParticipant: {
		auto &data = participant.c_channelParticipant();
		if (auto user = App::userLoaded(data.vuser_id.v)) {
			additional->infoNotLoaded.erase(user);
			additional->adminRights.erase(user);
			additional->adminCanEdit.erase(user);
			additional->adminPromotedBy.erase(user);
			additional->restrictedRights.erase(user);
			additional->kicked.erase(user);
			additional->restrictedBy.erase(user);
			callback(user);
		}
	} break;
	default: Unexpected("Participant type in AddParticipantBoxController::HandleParticipant()");
	}
}

AddParticipantBoxSearchController::AddParticipantBoxSearchController(not_null<ChannelData*> channel, not_null<Additional*> additional)
: _channel(channel)
, _additional(additional) {
	_timer.setCallback([this] { searchOnServer(); });
}

void AddParticipantBoxSearchController::searchQuery(const QString &query) {
	if (_query != query) {
		_query = query;
		_offset = 0;
		_requestId = 0;
		_participantsLoaded = false;
		_chatsContactsAdded = false;
		_globalLoaded = false;
		if (!_query.isEmpty() && !searchParticipantsInCache()) {
			_timer.callOnce(AutoSearchTimeout);
		} else {
			_timer.cancel();
		}
	}
}

void AddParticipantBoxSearchController::searchOnServer() {
	Expects(!_query.isEmpty());
	loadMoreRows();
}

bool AddParticipantBoxSearchController::isLoading() {
	return _timer.isActive() || _requestId;
}

bool AddParticipantBoxSearchController::searchParticipantsInCache() {
	auto it = _participantsCache.find(_query);
	if (it != _participantsCache.cend()) {
		_requestId = 0;
		searchParticipantsDone(_requestId, it->second.result, it->second.requestedCount);
		return true;
	}
	return false;
}

bool AddParticipantBoxSearchController::searchGlobalInCache() {
	auto it = _globalCache.find(_query);
	if (it != _globalCache.cend()) {
		_requestId = 0;
		searchGlobalDone(_requestId, it->second);
		return true;
	}
	return false;
}

bool AddParticipantBoxSearchController::loadMoreRows() {
	if (_query.isEmpty()) {
		return false;
	}
	if (_globalLoaded) {
		return true;
	}
	if (_participantsLoaded) {
		if (!_chatsContactsAdded) {
			addChatsContacts();
		}
		if (!isLoading() && !searchGlobalInCache()) {
			requestGlobal();
		}
	} else if (!isLoading()) {
		requestParticipants();
	}
	return true;
}

void AddParticipantBoxSearchController::requestParticipants() {
	// For search we request a lot of rows from the first query.
	// (because we've waited for search request by timer already,
	// so we don't expect it to be fast, but we want to fill cache).
	auto perPage = kParticipantsPerPage;
	auto participantsHash = 0;

	_requestId = request(MTPchannels_GetParticipants(
		_channel->inputChannel,
		MTP_channelParticipantsSearch(MTP_string(_query)),
		MTP_int(_offset),
		MTP_int(perPage),
		MTP_int(participantsHash)
	)).done([this, perPage](const MTPchannels_ChannelParticipants &result, mtpRequestId requestId) {
		searchParticipantsDone(requestId, result, perPage);
	}).fail([this](const RPCError &error, mtpRequestId requestId) {
		if (_requestId == requestId) {
			_requestId = 0;
			_participantsLoaded = true;
			loadMoreRows();
			delegate()->peerListSearchRefreshRows();
		}
	}).send();
	auto entry = Query();
	entry.text = _query;
	entry.offset = _offset;
	_participantsQueries.emplace(_requestId, entry);
}

void AddParticipantBoxSearchController::searchParticipantsDone(mtpRequestId requestId, const MTPchannels_ChannelParticipants &result, int requestedCount) {
	auto query = _query;
	if (requestId) {
		Auth().api().parseChannelParticipants(_channel, result, [&](auto&&...) {
			auto it = _participantsQueries.find(requestId);
			if (it != _participantsQueries.cend()) {
				query = it->second.text;
				if (it->second.offset == 0) {
					auto &entry = _participantsCache[query];
					entry.result = result;
					entry.requestedCount = requestedCount;
				}
				_participantsQueries.erase(it);
			}
		});
	}

	if (_requestId != requestId) {
		return;
	}
	_requestId = 0;
	TLHelp::VisitChannelParticipants(result, base::overload([&](
			const MTPDchannels_channelParticipants &data) {
		auto &list = data.vparticipants.v;
		if (list.size() < requestedCount) {
			// We want cache to have full information about a query with small
			// results count (if we don't need the second request). So we don't
			// wait for an empty results list unlike the non-search peer list.
			_participantsLoaded = true;
			if (list.empty() && _offset == 0) {
				// No results, so we want to request global search immediately.
				loadMoreRows();
			}
		}
		auto addUser = [&](auto user) {
			delegate()->peerListSearchAddRow(user);
		};
		for (auto &participant : list) {
			AddParticipantBoxController::HandleParticipant(
				participant,
				_additional,
				addUser);
		}
		_offset += list.size();
	}, [&](mtpTypeId type) {
		_participantsLoaded = true;
	}));

	delegate()->peerListSearchRefreshRows();
}

void AddParticipantBoxSearchController::requestGlobal() {
	if (_query.size() < MinUsernameLength) {
		_globalLoaded = true;
		return;
	}

	auto perPage = SearchPeopleLimit;
	_requestId = request(MTPcontacts_Search(MTP_string(_query), MTP_int(perPage))).done([this](const MTPcontacts_Found &result, mtpRequestId requestId) {
		searchGlobalDone(requestId, result);
	}).fail([this](const RPCError &error, mtpRequestId requestId) {
		if (_requestId == requestId) {
			_requestId = 0;
			_globalLoaded = true;
			delegate()->peerListSearchRefreshRows();
		}
	}).send();
	_globalQueries.emplace(_requestId, _query);
}

void AddParticipantBoxSearchController::searchGlobalDone(mtpRequestId requestId, const MTPcontacts_Found &result) {
	Expects(result.type() == mtpc_contacts_found);

	auto &found = result.c_contacts_found();
	auto query = _query;
	if (requestId) {
		App::feedUsers(found.vusers);
		App::feedChats(found.vchats);
		auto it = _globalQueries.find(requestId);
		if (it != _globalQueries.cend()) {
			query = it->second;
			_globalCache[query] = result;
			_globalQueries.erase(it);
		}
	}

	if (_requestId == requestId) {
		_requestId = 0;
		_globalLoaded = true;
		for_const (auto &mtpPeer, found.vresults.v) {
			auto peerId = peerFromMTP(mtpPeer);
			if (auto peer = App::peerLoaded(peerId)) {
				if (auto user = peer->asUser()) {
					if (_additional->adminRights.find(user) == _additional->adminRights.cend()
						&& _additional->restrictedRights.find(user) == _additional->restrictedRights.cend()
						&& _additional->external.find(user) == _additional->external.cend()
						&& _additional->kicked.find(user) == _additional->kicked.cend()
						&& _additional->creator != user) {
						_additional->infoNotLoaded.emplace(user);
					}
					delegate()->peerListSearchAddRow(user);
				}
			}
		}
		delegate()->peerListSearchRefreshRows();
	}
}

void AddParticipantBoxSearchController::addChatsContacts() {
	_chatsContactsAdded = true;

	auto wordList = TextUtilities::PrepareSearchWords(_query);
	if (wordList.empty()) {
		return;
	}

	auto getSmallestIndex = [&](Dialogs::IndexedList *list) -> const Dialogs::List* {
		if (list->isEmpty()) {
			return nullptr;
		}

		auto result = (const Dialogs::List*)nullptr;
		for_const (auto &word, wordList) {
			auto found = list->filtered(word[0]);
			if (found->isEmpty()) {
				return nullptr;
			}
			if (!result || result->size() > found->size()) {
				result = found;
			}
		}
		return result;
	};
	auto dialogsIndex = getSmallestIndex(App::main()->dialogsList());
	auto contactsIndex = getSmallestIndex(App::main()->contactsNoDialogsList());

	auto allWordsAreFound = [&](const base::flat_set<QString> &nameWords) {
		auto hasNamePartStartingWith = [&](const QString &word) {
			for (auto &nameWord : nameWords) {
				if (nameWord.startsWith(word)) {
					return true;
				}
			}
			return false;
		};

		for_const (auto &word, wordList) {
			if (!hasNamePartStartingWith(word)) {
				return false;
			}
		}
		return true;
	};
	auto filterAndAppend = [&](const Dialogs::List *list) {
		if (!list) {
			return;
		}

		for_const (auto row, *list) {
			if (auto user = row->history()->peer->asUser()) {
				if (allWordsAreFound(user->nameWords())) {
					delegate()->peerListSearchAddRow(user);
				}
			}
		}
	};
	filterAndAppend(dialogsIndex);
	filterAndAppend(contactsIndex);
	delegate()->peerListSearchRefreshRows();
}

} // namespace Profile
