Swiftgram/TelegramUI/ChannelAdminsController.swift

import Foundation
import Display
import SwiftSignalKit
import Postbox
import TelegramCore

private final class ChannelAdminsControllerArguments {
    let account: Account
    
    let openRecentActions: () -> Void
    let setPeerIdWithRevealedOptions: (PeerId?, PeerId?) -> Void
    let removeAdmin: (PeerId) -> Void
    let addAdmin: () -> Void
    let openAdmin: (ChannelParticipant) -> Void
    
    init(account: Account, openRecentActions: @escaping () -> Void, setPeerIdWithRevealedOptions: @escaping (PeerId?, PeerId?) -> Void, removeAdmin: @escaping (PeerId) -> Void, addAdmin: @escaping () -> Void, openAdmin: @escaping (ChannelParticipant) -> Void) {
        self.account = account
        self.openRecentActions = openRecentActions
        self.setPeerIdWithRevealedOptions = setPeerIdWithRevealedOptions
        self.removeAdmin = removeAdmin
        self.addAdmin = addAdmin
        self.openAdmin = openAdmin
    }
}

private enum ChannelAdminsSection: Int32 {
    case administration
    case admins
}

private enum ChannelAdminsEntryStableId: Hashable {
    case index(Int32)
    case peer(PeerId)
    
    var hashValue: Int {
        switch self {
            case let .index(index):
                return index.hashValue
            case let .peer(peerId):
                return peerId.hashValue
        }
    }
    
    static func ==(lhs: ChannelAdminsEntryStableId, rhs: ChannelAdminsEntryStableId) -> Bool {
        switch lhs {
            case let .index(index):
                if case .index(index) = rhs {
                    return true
                } else {
                    return false
                }
            case let .peer(peerId):
                if case .peer(peerId) = rhs {
                    return true
                } else {
                    return false
                }
        }
    }
}

private enum ChannelAdminsEntry: ItemListNodeEntry {
    case recentActions(PresentationTheme, String)
    
    case adminsHeader(PresentationTheme, String)
    case adminPeerItem(PresentationTheme, PresentationStrings, PresentationDateTimeFormat, PresentationPersonNameOrder, Bool, Int32, RenderedChannelParticipant, ItemListPeerItemEditing, Bool)
    case addAdmin(PresentationTheme, String, Bool)
    case adminsInfo(PresentationTheme, String)
    
    var section: ItemListSectionId {
        switch self {
            case .recentActions:
                return ChannelAdminsSection.administration.rawValue
            case .adminsHeader, .adminPeerItem, .addAdmin, .adminsInfo:
                return ChannelAdminsSection.admins.rawValue
        }
    }
    
    var stableId: ChannelAdminsEntryStableId {
        switch self {
            case .recentActions:
                return .index(0)
            case .adminsHeader:
                return .index(3)
            case .addAdmin:
                return .index(4)
            case .adminsInfo:
                return .index(5)
            case let .adminPeerItem(_, _, _, _, _, _, participant, _, _):
                return .peer(participant.peer.id)
        }
    }
    
    static func ==(lhs: ChannelAdminsEntry, rhs: ChannelAdminsEntry) -> Bool {
        switch lhs {
            case let .recentActions(lhsTheme, lhsText):
                if case let .recentActions(rhsTheme, rhsText) = rhs, lhsTheme === rhsTheme, lhsText == rhsText {
                    return true
                } else {
                    return false
                }
            case let .adminsHeader(lhsTheme, lhsText):
                if case let .adminsHeader(rhsTheme, rhsText) = rhs, lhsTheme === rhsTheme, lhsText == rhsText {
                    return true
                } else {
                    return false
                }
            case let .adminPeerItem(lhsTheme, lhsStrings, lhsDateTimeFormat, lhsNameOrder, lhsIsGroup, lhsIndex, lhsParticipant, lhsEditing, lhsEnabled):
                if case let .adminPeerItem(rhsTheme, rhsStrings, rhsDateTimeFormat, rhsNameOrder, rhsIsGroup, rhsIndex, rhsParticipant, rhsEditing, rhsEnabled) = rhs {
                    if lhsTheme !== rhsTheme {
                        return false
                    }
                    if lhsStrings !== rhsStrings {
                        return false
                    }
                    if lhsDateTimeFormat != rhsDateTimeFormat {
                        return false
                    }
                    if lhsNameOrder != rhsNameOrder {
                        return false
                    }
                    if lhsIsGroup != rhsIsGroup {
                        return false
                    }
                    if lhsIndex != rhsIndex {
                        return false
                    }
                    if lhsParticipant != rhsParticipant {
                        return false
                    }
                    if lhsEditing != rhsEditing {
                        return false
                    }
                    if lhsEnabled != rhsEnabled {
                        return false
                    }
                    return true
                } else {
                    return false
                }
            case let .adminsInfo(lhsTheme, lhsText):
                if case let .adminsInfo(rhsTheme, rhsText) = rhs, lhsTheme === rhsTheme, lhsText == rhsText {
                    return true
                } else {
                    return false
                }
            case let .addAdmin(lhsTheme, lhsText, lhsEditing):
                if case let .addAdmin(rhsTheme, rhsText, rhsEditing) = rhs, lhsTheme === rhsTheme, lhsText == rhsText, lhsEditing == rhsEditing {
                    return true
                } else {
                    return false
                }
        }
    }
    
    static func <(lhs: ChannelAdminsEntry, rhs: ChannelAdminsEntry) -> Bool {
        switch lhs {
            case .recentActions:
                return true
            case .adminsHeader:
                switch rhs {
                    case .recentActions:
                        return false
                    default:
                        return true
                }
            case let .adminPeerItem(_, _, _, _, _, index, _, _, _):
                switch rhs {
                    case .recentActions, .adminsHeader, .addAdmin:
                        return false
                    case let .adminPeerItem(_, _, _, _, _, rhsIndex, _, _, _):
                        return index < rhsIndex
                    default:
                        return true
                }
            case .addAdmin:
                switch rhs {
                    case .recentActions, .adminsHeader, .addAdmin:
                        return false
                    default:
                        return true
                }
            case .adminsInfo:
                return false
        }
    }
    
    func item(_ arguments: ChannelAdminsControllerArguments) -> ListViewItem {
        switch self {
            case let .recentActions(theme, text):
                return ItemListDisclosureItem(theme: theme, title: text, label: "", sectionId: self.section, style: .blocks, action: {
                    arguments.openRecentActions()
                })
            case let .adminsHeader(theme, title):
                return ItemListSectionHeaderItem(theme: theme, text: title, sectionId: self.section)
            case let .adminPeerItem(theme, strings, dateTimeFormat, nameDisplayOrder, _, _, participant, editing, enabled):
                let peerText: String
                let action: (() -> Void)?
                switch participant.participant {
                    case .creator:
                        peerText = strings.Channel_Management_LabelCreator
                        action = nil
                    case let .member(_, _, adminInfo, _):
                        if let adminInfo = adminInfo {
                            if let peer = participant.peers[adminInfo.promotedBy] {
                                peerText = strings.Channel_Management_PromotedBy(peer.displayTitle).0
                            } else {
                                peerText = ""
                            }
                        } else {
                            peerText = ""
                        }
                        action = {
                            arguments.openAdmin(participant.participant)
                        }
                }
                return ItemListPeerItem(theme: theme, strings: strings, dateTimeFormat: dateTimeFormat, nameDisplayOrder: nameDisplayOrder, account: arguments.account, peer: participant.peer, presence: nil, text: .text(peerText), label: .none, editing: editing, switchValue: nil, enabled: enabled, sectionId: self.section, action: action, setPeerIdWithRevealedOptions: { previousId, id in
                    arguments.setPeerIdWithRevealedOptions(previousId, id)
                }, removePeer: { peerId in
                    arguments.removeAdmin(peerId)
                })
            case let .addAdmin(theme, text, editing):
                return ItemListPeerActionItem(theme: theme, icon: PresentationResourcesItemList.addPersonIcon(theme), title: text, sectionId: self.section, editing: editing, action: {
                    arguments.addAdmin()
                })
            case let .adminsInfo(theme, text):
                return ItemListTextItem(theme: theme, text: .plain(text), sectionId: self.section)
        }
    }
}

private struct ChannelAdminsControllerState: Equatable {
    let editing: Bool
    let peerIdWithRevealedOptions: PeerId?
    let removingPeerId: PeerId?
    let removedPeerIds: Set<PeerId>
    let temporaryAdmins: [RenderedChannelParticipant]
    let searchingMembers: Bool

    init() {
        self.editing = false
        self.peerIdWithRevealedOptions = nil
        self.removingPeerId = nil
        self.removedPeerIds = Set()
        self.temporaryAdmins = []
        self.searchingMembers = false
    }
    
    init(editing: Bool, peerIdWithRevealedOptions: PeerId?, removingPeerId: PeerId?, removedPeerIds: Set<PeerId>, temporaryAdmins: [RenderedChannelParticipant], searchingMembers: Bool) {
        self.editing = editing
        self.peerIdWithRevealedOptions = peerIdWithRevealedOptions
        self.removingPeerId = removingPeerId
        self.removedPeerIds = removedPeerIds
        self.temporaryAdmins = temporaryAdmins
        self.searchingMembers = searchingMembers
    }
    
    static func ==(lhs: ChannelAdminsControllerState, rhs: ChannelAdminsControllerState) -> Bool {
        if lhs.editing != rhs.editing {
            return false
        }
        if lhs.peerIdWithRevealedOptions != rhs.peerIdWithRevealedOptions {
            return false
        }
        if lhs.removingPeerId != rhs.removingPeerId {
            return false
        }
        if lhs.removedPeerIds != rhs.removedPeerIds {
            return false
        }
        if lhs.temporaryAdmins != rhs.temporaryAdmins {
            return false
        }
        if lhs.searchingMembers != rhs.searchingMembers {
            return false
        }
        
        return true
    }
    
    func withUpdatedSearchingMembers(_ searchingMembers: Bool) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: self.editing, peerIdWithRevealedOptions: self.peerIdWithRevealedOptions, removingPeerId: self.removingPeerId, removedPeerIds: self.removedPeerIds, temporaryAdmins: self.temporaryAdmins, searchingMembers: searchingMembers)
    }
    
    func withUpdatedEditing(_ editing: Bool) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: editing, peerIdWithRevealedOptions: self.peerIdWithRevealedOptions, removingPeerId: self.removingPeerId, removedPeerIds: self.removedPeerIds, temporaryAdmins: self.temporaryAdmins, searchingMembers: self.searchingMembers)
    }
    
    func withUpdatedPeerIdWithRevealedOptions(_ peerIdWithRevealedOptions: PeerId?) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: self.editing, peerIdWithRevealedOptions: peerIdWithRevealedOptions, removingPeerId: self.removingPeerId, removedPeerIds: self.removedPeerIds, temporaryAdmins: self.temporaryAdmins, searchingMembers: self.searchingMembers)
    }
    
    func withUpdatedRemovingPeerId(_ removingPeerId: PeerId?) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: self.editing, peerIdWithRevealedOptions: self.peerIdWithRevealedOptions, removingPeerId: removingPeerId, removedPeerIds: self.removedPeerIds, temporaryAdmins: self.temporaryAdmins, searchingMembers: self.searchingMembers)
    }
    
    func withUpdatedRemovedPeerIds(_ removedPeerIds: Set<PeerId>) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: self.editing, peerIdWithRevealedOptions: self.peerIdWithRevealedOptions, removingPeerId: self.removingPeerId, removedPeerIds: removedPeerIds, temporaryAdmins: self.temporaryAdmins, searchingMembers: self.searchingMembers)
    }
    
    func withUpdatedTemporaryAdmins(_ temporaryAdmins: [RenderedChannelParticipant]) -> ChannelAdminsControllerState {
        return ChannelAdminsControllerState(editing: self.editing, peerIdWithRevealedOptions: self.peerIdWithRevealedOptions, removingPeerId: self.removingPeerId, removedPeerIds: self.removedPeerIds, temporaryAdmins: temporaryAdmins, searchingMembers: self.searchingMembers)
    }
}

private func channelAdminsControllerEntries(presentationData: PresentationData, accountPeerId: PeerId, view: PeerView, state: ChannelAdminsControllerState, participants: [RenderedChannelParticipant]?) -> [ChannelAdminsEntry] {
    if participants == nil || participants?.count == nil {
        return []
    }
    
    var entries: [ChannelAdminsEntry] = []
    
    if let peer = view.peers[view.peerId] as? TelegramChannel {
        var isGroup = false
        if case .group = peer.info {
            isGroup = true
            
            entries.append(.recentActions(presentationData.theme, presentationData.strings.Group_Info_AdminLog))
        } else {
            entries.append(.recentActions(presentationData.theme, presentationData.strings.Group_Info_AdminLog))
        }
        
        if let participants = participants {
            entries.append(.adminsHeader(presentationData.theme, isGroup ? presentationData.strings.ChannelMembers_GroupAdminsTitle : presentationData.strings.ChannelMembers_ChannelAdminsTitle))
            
            if peer.hasPermission(.addAdmins) {
                entries.append(.addAdmin(presentationData.theme, presentationData.strings.Channel_Management_AddModerator, state.editing))
            }
            
            var combinedParticipants: [RenderedChannelParticipant] = participants
            var existingParticipantIds = Set<PeerId>()
            for participant in participants {
                existingParticipantIds.insert(participant.peer.id)
            }
            
            for participant in state.temporaryAdmins {
                if !existingParticipantIds.contains(participant.peer.id) {
                    combinedParticipants.append(participant)
                }
            }
            
            var index: Int32 = 0
            for participant in combinedParticipants.sorted(by: { lhs, rhs in
                let lhsInvitedAt: Int32
                switch lhs.participant {
                    case .creator:
                        lhsInvitedAt = Int32.min
                    case let .member(_, invitedAt, _, _):
                        lhsInvitedAt = invitedAt
                }
                let rhsInvitedAt: Int32
                switch rhs.participant {
                    case .creator:
                        rhsInvitedAt = Int32.min
                    case let .member(_, invitedAt, _, _):
                        rhsInvitedAt = invitedAt
                }
                return lhsInvitedAt < rhsInvitedAt
            }) {
                if !state.removedPeerIds.contains(participant.peer.id) {
                    var editable = true
                    switch participant.participant {
                        case .creator:
                            editable = false
                        case let .member(id, _, adminInfo, _):
                            if id == accountPeerId {
                                editable = false
                            } else if let adminInfo = adminInfo {
                                if peer.flags.contains(.isCreator) || adminInfo.promotedBy == accountPeerId {
                                    editable = true
                                } else {
                                    editable = false
                                }
                            } else {
                                editable = false
                            }
                    }
                    entries.append(.adminPeerItem(presentationData.theme, presentationData.strings, presentationData.dateTimeFormat, presentationData.nameDisplayOrder, isGroup, index, participant, ItemListPeerItemEditing(editable: editable, editing: state.editing, revealed: participant.peer.id == state.peerIdWithRevealedOptions), state.removingPeerId != participant.peer.id && existingParticipantIds.contains(participant.peer.id)))
                    index += 1
                }
            }
            
            if peer.hasPermission(.addAdmins) {
                let info = isGroup ? presentationData.strings.Group_Management_AddModeratorHelp : presentationData.strings.Channel_Management_AddModeratorHelp
                entries.append(.adminsInfo(presentationData.theme, info))
            }
        }
    } else if let peer = view.peers[view.peerId] as? TelegramGroup {
        let isGroup = true
        //entries.append(.recentActions(presentationData.theme, presentationData.strings.Group_Info_AdminLog))
        
        if let participants = participants {
            entries.append(.adminsHeader(presentationData.theme, presentationData.strings.ChannelMembers_GroupAdminsTitle))
            
            if case .creator = peer.role {
                entries.append(.addAdmin(presentationData.theme, presentationData.strings.Channel_Management_AddModerator, state.editing))
            }
            
            var combinedParticipants: [RenderedChannelParticipant] = participants
            var existingParticipantIds = Set<PeerId>()
            for participant in participants {
                existingParticipantIds.insert(participant.peer.id)
            }
            
            for participant in state.temporaryAdmins {
                if !existingParticipantIds.contains(participant.peer.id) {
                    combinedParticipants.append(participant)
                }
            }
            
            var index: Int32 = 0
            for participant in combinedParticipants.sorted(by: { lhs, rhs in
                let lhsInvitedAt: Int32
                switch lhs.participant {
                    case .creator:
                        lhsInvitedAt = Int32.min
                    case let .member(_, invitedAt, _, _):
                        lhsInvitedAt = invitedAt
                }
                let rhsInvitedAt: Int32
                switch rhs.participant {
                    case .creator:
                        rhsInvitedAt = Int32.min
                    case let .member(_, invitedAt, _, _):
                        rhsInvitedAt = invitedAt
                }
                return lhsInvitedAt < rhsInvitedAt
            }) {
                if !state.removedPeerIds.contains(participant.peer.id) {
                    var editable = true
                    switch participant.participant {
                    case .creator:
                        editable = false
                    case let .member(id, _, adminInfo, _):
                        if id == accountPeerId {
                            editable = false
                        } else if let adminInfo = adminInfo {
                            if peer.role == .creator || adminInfo.promotedBy == accountPeerId {
                                editable = true
                            } else {
                                editable = false
                            }
                        } else {
                            editable = false
                        }
                    }
                    entries.append(.adminPeerItem(presentationData.theme, presentationData.strings, presentationData.dateTimeFormat, presentationData.nameDisplayOrder, isGroup, index, participant, ItemListPeerItemEditing(editable: editable, editing: state.editing, revealed: participant.peer.id == state.peerIdWithRevealedOptions), state.removingPeerId != participant.peer.id && existingParticipantIds.contains(participant.peer.id)))
                    index += 1
                }
            }
            
            if case .creator = peer.role {
                let info = presentationData.strings.Group_Management_AddModeratorHelp
                entries.append(.adminsInfo(presentationData.theme, info))
            }
        }
    }
    
    return entries
}

public func channelAdminsController(account: Account, peerId: PeerId, loadCompleted: @escaping () -> Void = {}) -> ViewController {
    let statePromise = ValuePromise(ChannelAdminsControllerState(), ignoreRepeated: true)
    let stateValue = Atomic(value: ChannelAdminsControllerState())
    let updateState: ((ChannelAdminsControllerState) -> ChannelAdminsControllerState) -> Void = { f in
        statePromise.set(stateValue.modify { f($0) })
    }
    
    var pushControllerImpl: ((ViewController) -> Void)?
    var presentControllerImpl: ((ViewController, Any?) -> Void)?
    
    let actionsDisposable = DisposableSet()

    let removeAdminDisposable = MetaDisposable()
    actionsDisposable.add(removeAdminDisposable)
    
    let addAdminDisposable = MetaDisposable()
    actionsDisposable.add(addAdminDisposable)
    
    let upgradeDisposable = MetaDisposable()
    actionsDisposable.add(upgradeDisposable)
    
    let adminsPromise = Promise<[RenderedChannelParticipant]?>(nil)
    
    let presentationDataSignal = (account.applicationContext as! TelegramApplicationContext).presentationData
    
    var upgradedToSupergroupImpl: ((PeerId, @escaping () -> Void) -> Void)?
    
    let upgradedToSupergroup: (PeerId, @escaping () -> Void) -> Void = { upgradedPeerId, f in
        upgradedToSupergroupImpl?(upgradedPeerId, f)
    }
    
    let peerView = Promise<PeerView>()
    peerView.set(account.viewTracker.peerView(peerId))
    
    let arguments = ChannelAdminsControllerArguments(account: account, openRecentActions: {
        let _ = (account.postbox.loadedPeerWithId(peerId)
        |> deliverOnMainQueue).start(next: { peer in
            if peer is TelegramGroup {
            } else {
                pushControllerImpl?(ChatRecentActionsController(account: account, peer: peer))
            }
        })
    }, setPeerIdWithRevealedOptions: { peerId, fromPeerId in
        updateState { state in
            if (peerId == nil && fromPeerId == state.peerIdWithRevealedOptions) || (peerId != nil && fromPeerId == nil) {
                return state.withUpdatedPeerIdWithRevealedOptions(peerId)
            } else {
                return state
            }
        }
    }, removeAdmin: { adminId in
        updateState {
            return $0.withUpdatedRemovingPeerId(adminId)
        }
        if peerId.namespace == Namespaces.Peer.CloudGroup {
            removeAdminDisposable.set((removeGroupAdmin(account: account, peerId: peerId, adminId: adminId)
            |> deliverOnMainQueue).start(completed: {
                updateState {
                    return $0.withUpdatedRemovingPeerId(nil)
                }
            }))
        } else {
            removeAdminDisposable.set((account.telegramApplicationContext.peerChannelMemberCategoriesContextsManager.updateMemberAdminRights(account: account, peerId: peerId, memberId: adminId, adminRights: TelegramChatAdminRights(flags: []))
            |> deliverOnMainQueue).start(completed: {
                updateState {
                    return $0.withUpdatedRemovingPeerId(nil)
                }
            }))
        }
    }, addAdmin: {
        let _ = (peerView.get()
        |> take(1)
        |> deliverOnMainQueue).start(next: { peerView in
            updateState { current in
                var dismissController: (() -> Void)?
                let controller = ChannelMembersSearchController(account: account, peerId: peerId, mode: .promote, filters: [], openPeer: { peer, participant in
                    dismissController?()
                    let presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
                    if peer.id == account.peerId {
                        return
                    }
                    if let participant = participant {
                        switch participant.participant {
                            case .creator:
                                return
                            case let .member(_, _, _, banInfo):
                                if let banInfo = banInfo {
                                    var canUnban = false
                                    if banInfo.restrictedBy != account.peerId {
                                        canUnban = true
                                    }
                                    if let channel = peerView.peers[peerId] as? TelegramChannel {
                                        if channel.hasPermission(.banMembers) {
                                            canUnban = true
                                        }
                                    }
                                    if !canUnban {
                                        presentControllerImpl?(standardTextAlertController(theme: AlertControllerTheme(presentationTheme: presentationData.theme), title: nil, text: presentationData.strings.Channel_Members_AddAdminErrorBlacklisted, actions: [TextAlertAction(type: .defaultAction, title: presentationData.strings.Common_OK, action: {})]), nil)
                                        return
                                    }
                                }
                        }
                    }
                    presentControllerImpl?(channelAdminController(account: account, peerId: peerId, adminId: peer.id, initialParticipant: participant?.participant, updated: { _ in
                    }, upgradedToSupergroup: upgradedToSupergroup), ViewControllerPresentationArguments(presentationAnimation: .modalSheet))
                })
                dismissController = { [weak controller] in
                    controller?.dismiss()
                }
                presentControllerImpl?(controller, ViewControllerPresentationArguments(presentationAnimation: .modalSheet))
                
                return current
            }
        })
    }, openAdmin: { participant in
        presentControllerImpl?(channelAdminController(account: account, peerId: peerId, adminId: participant.peerId, initialParticipant: participant, updated: { _ in
        }, upgradedToSupergroup: upgradedToSupergroup), ViewControllerPresentationArguments(presentationAnimation: .modalSheet))
    })
    
    let membersAndLoadMoreControl: (Disposable, PeerChannelMemberCategoryControl?)
    if peerId.namespace == Namespaces.Peer.CloudChannel {
        var didReportLoadCompleted = false
        membersAndLoadMoreControl = account.telegramApplicationContext.peerChannelMemberCategoriesContextsManager.admins(postbox: account.postbox, network: account.network, accountPeerId: account.peerId, peerId: peerId) { membersState in
            if case .loading = membersState.loadingState, membersState.list.isEmpty {
                adminsPromise.set(.single(nil))
            } else {
                adminsPromise.set(.single(membersState.list))
                if !didReportLoadCompleted {
                    didReportLoadCompleted = true
                    loadCompleted()
                }
            }
        }
    } else {
        loadCompleted()
        let membersDisposable = (peerView.get()
        |> map { peerView -> [RenderedChannelParticipant]? in
            guard let cachedData = peerView.cachedData as? CachedGroupData, let participants = cachedData.participants else {
                return nil
            }
            var result: [RenderedChannelParticipant] = []
            var creatorPeer: Peer?
            for participant in participants.participants {
                if let peer = peerView.peers[participant.peerId] {
                    switch participant {
                        case .creator:
                            creatorPeer = peer
                        default:
                            break
                    }
                }
            }
            guard let creator = creatorPeer else {
                return nil
            }
            for participant in participants.participants {
                if let peer = peerView.peers[participant.peerId] {
                    switch participant {
                        case .creator:
                            result.append(RenderedChannelParticipant(participant: .creator(id: peer.id), peer: peer))
                        case .admin:
                            var peers: [PeerId: Peer] = [:]
                            peers[creator.id] = creator
                            peers[peer.id] = peer
                            result.append(RenderedChannelParticipant(participant: .member(id: peer.id, invitedAt: 0, adminInfo: ChannelParticipantAdminInfo(rights: TelegramChatAdminRights(flags: .groupSpecific), promotedBy: creator.id, canBeEditedByAccountPeer: creator.id == account.peerId), banInfo: nil), peer: peer, peers: peers))
                        case .member:
                            break
                    }
                }
            }
            return result
        }).start(next: { members in
            adminsPromise.set(.single(members))
        })
        membersAndLoadMoreControl = (membersDisposable, nil)
    }
    
    let (membersDisposable, loadMoreControl) = membersAndLoadMoreControl
    actionsDisposable.add(membersDisposable)
    
    var previousPeers: [RenderedChannelParticipant]?
    
    let signal = combineLatest(queue: .mainQueue(), presentationDataSignal, statePromise.get(), peerView.get(), adminsPromise.get() |> deliverOnMainQueue)
    |> deliverOnMainQueue
    |> map { presentationData, state, view, admins -> (ItemListControllerState, (ItemListNodeState<ChannelAdminsEntry>, ChannelAdminsEntry.ItemGenerationArguments)) in
        var rightNavigationButton: ItemListNavigationButton?
        var secondaryRightNavigationButton: ItemListNavigationButton?
        if let admins = admins, admins.count > 1 {
            if state.editing {
                rightNavigationButton = ItemListNavigationButton(content: .text(presentationData.strings.Common_Done), style: .bold, enabled: true, action: {
                    updateState { state in
                        return state.withUpdatedEditing(false)
                    }
                })
            } else if let peer = view.peers[peerId] as? TelegramChannel, peer.flags.contains(.isCreator) {
                rightNavigationButton = ItemListNavigationButton(content: .text(presentationData.strings.Common_Edit), style: .regular, enabled: true, action: {
                    updateState { state in
                        return state.withUpdatedEditing(true)
                    }
                })
            }
            
            if !state.editing && peerId.namespace == Namespaces.Peer.CloudChannel {
                if rightNavigationButton == nil {
                    rightNavigationButton = ItemListNavigationButton(content: .icon(.search), style: .regular, enabled: true, action: {
                        updateState { state in
                            return state.withUpdatedSearchingMembers(true)
                        }
                    })
                } else {
                    secondaryRightNavigationButton = ItemListNavigationButton(content: .icon(.search), style: .regular, enabled: true, action: {
                        updateState { state in
                            return state.withUpdatedSearchingMembers(true)
                        }
                    })
                }
            }
        }
        
        let previous = previousPeers
        previousPeers = admins
        
        var isGroup = true
        if let peer = view.peers[peerId] as? TelegramChannel, case .broadcast = peer.info {
            isGroup = false
        } else if let _ = view.peers[peerId] as? TelegramGroup {
            isGroup = true
        }
        
        var searchItem: ItemListControllerSearch?
        if state.searchingMembers {
            searchItem = ChannelMembersSearchItem(account: account, peerId: peerId, searchMode: .searchAdmins, cancel: {
                updateState { state in
                    return state.withUpdatedSearchingMembers(false)
                }
            }, openPeer: { _, participant in
                if let participant = participant?.participant, case .member = participant {
                    presentControllerImpl?(channelAdminController(account: account, peerId: peerId, adminId: participant.peerId, initialParticipant: participant, updated: { _ in
                        updateState { state in
                            return state.withUpdatedSearchingMembers(false)
                        }
                    }, upgradedToSupergroup: upgradedToSupergroup), ViewControllerPresentationArguments(presentationAnimation: .modalSheet))
                }
            }, present: { c, a in
                presentControllerImpl?(c, a)
            })
        }
        
        var emptyStateItem: ItemListControllerEmptyStateItem?
        if admins == nil || admins?.count == 0 {
            emptyStateItem = ItemListLoadingIndicatorEmptyStateItem(theme: presentationData.theme)
        }
        
        let controllerState = ItemListControllerState(theme: presentationData.theme, title: .text(isGroup ? presentationData.strings.ChatAdmins_Title : presentationData.strings.Channel_Management_Title), leftNavigationButton: nil, rightNavigationButton: rightNavigationButton, secondaryRightNavigationButton: secondaryRightNavigationButton, backNavigationButton: ItemListBackButton(title: presentationData.strings.Common_Back), animateChanges: true)
        let listState = ItemListNodeState(entries: channelAdminsControllerEntries(presentationData: presentationData, accountPeerId: account.peerId, view: view, state: state, participants: admins), style: .blocks, emptyStateItem: emptyStateItem, searchItem: searchItem, animateChanges: previous != nil && admins != nil && previous!.count >= admins!.count)
        
        return (controllerState, (listState, arguments))
    } |> afterDisposed {
        actionsDisposable.dispose()
    }
    
    let controller = ItemListController(account: account, state: signal)
    pushControllerImpl = { [weak controller] c in
        (controller?.navigationController as? NavigationController)?.pushViewController(c)
    }
    presentControllerImpl = { [weak controller] c, p in
        if let controller = controller {
            controller.present(c, in: .window(.root), with: p)
            controller.view.endEditing(true)
        }
    }
    upgradedToSupergroupImpl = { [weak controller] upgradedPeerId, f in
        guard let controller = controller, let navigationController = controller.navigationController as? NavigationController else {
            return
        }
        navigateToChatController(navigationController: navigationController, account: account, chatLocation: .peer(upgradedPeerId), keepStack: .never, animated: false, completion: {
            navigationController.pushViewController(channelAdminsController(account: account, peerId: upgradedPeerId, loadCompleted: {
                f()
            }), animated: false)
        })
    }
    controller.visibleBottomContentOffsetChanged = { offset in
        if case let .known(value) = offset, value < 40.0 {
            account.telegramApplicationContext.peerChannelMemberCategoriesContextsManager.loadMore(peerId: peerId, control: loadMoreControl)
        }
    }
    return controller
}