import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import TelegramCore
import TelegramPresentationData
import TelegramUIPreferences
import MergeLists
import ActivityIndicator
import TextFormat
import AccountContext
import ContextUI
import RadialStatusNode
import UndoUI
import StickerPackPreviewUI

private struct StickerPackPreviewGridEntry: Comparable, Equatable, Identifiable {
    let index: Int
    let stickerItem: ImportStickerPack.Sticker
    let isVerified: Bool
    
    var stableId: Int {
        return self.index
    }
    
    static func <(lhs: StickerPackPreviewGridEntry, rhs: StickerPackPreviewGridEntry) -> Bool {
        return lhs.index < rhs.index
    }
    
    func item(account: Account, interaction: StickerPackPreviewInteraction, theme: PresentationTheme) -> StickerPackPreviewGridItem {
        return StickerPackPreviewGridItem(account: account, stickerItem: self.stickerItem, interaction: interaction, theme: theme, isVerified: self.isVerified)
    }
}

private struct StickerPackPreviewGridTransaction {
    let deletions: [Int]
    let insertions: [GridNodeInsertItem]
    let updates: [GridNodeUpdateItem]
    
    init(previousList: [StickerPackPreviewGridEntry], list: [StickerPackPreviewGridEntry], account: Account, interaction: StickerPackPreviewInteraction, theme: PresentationTheme) {
         let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: previousList, rightList: list)
        
        self.deletions = deleteIndices
        self.insertions = indicesAndItems.map { GridNodeInsertItem(index: $0.0, item: $0.1.item(account: account, interaction: interaction, theme: theme), previousIndex: $0.2) }
        self.updates = updateIndices.map { GridNodeUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(account: account, interaction: interaction, theme: theme)) }
    }
}

final class ImportStickerPackControllerNode: ViewControllerTracingNode, UIScrollViewDelegate {
    private let context: AccountContext
    private var presentationData: PresentationData
    private var stickerPack: ImportStickerPack?
    var stickerResources: [UUID: EngineMediaResource] = [:]
    private var uploadedStickerResources: [UUID: EngineMediaResource] = [:]
    private var stickerPackReady = true
    
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    
    private let dimNode: ASDisplayNode
    
    private let wrappingScrollNode: ASScrollNode
    private let cancelButtonNode: ASButtonNode
    
    private let contentContainerNode: ASDisplayNode
    private let contentBackgroundNode: ASImageNode
    private let contentGridNode: GridNode
    private let createActionButtonNode: ASButtonNode
    private let createActionSeparatorNode: ASDisplayNode
    private let addToExistingActionButtonNode: ASButtonNode
    private let addToExistingActionSeparatorNode: ASDisplayNode
    private let contentTitleNode: ImmediateTextNode
    private let contentSeparatorNode: ASDisplayNode
    
    private let radialStatus: RadialStatusNode
    private let radialCheck: RadialStatusNode
    private let radialStatusBackground: ASImageNode
    private let radialStatusText: ImmediateTextNode
    private let progressText: ImmediateTextNode
    private let infoText: ImmediateTextNode
    
    private var interaction: StickerPackPreviewInteraction!
    
    weak var navigationController: NavigationController?
    
    var present: ((ViewController, Any?) -> Void)?
    var presentInGlobalOverlay: ((ViewController, Any?) -> Void)?
    var dismiss: (() -> Void)?
    var cancel: (() -> Void)?
    
    let ready = Promise<Bool>()
    private var didSetReady = false
    
    private var pendingItems: [StickerPackPreviewGridEntry] = []
    private var currentItems: [StickerPackPreviewGridEntry] = []
    
    private var hapticFeedback: HapticFeedback?
    
    private let disposable = MetaDisposable()
    private let shortNameSuggestionDisposable = MetaDisposable()
    
    private var progress: (CGFloat, Int32, Int32)?
        
    init(context: AccountContext) {
        self.context = context
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        
        self.wrappingScrollNode = ASScrollNode()
        self.wrappingScrollNode.view.alwaysBounceVertical = true
        self.wrappingScrollNode.view.delaysContentTouches = false
        self.wrappingScrollNode.view.canCancelContentTouches = true
        
        self.dimNode = ASDisplayNode()
        self.dimNode.backgroundColor = UIColor(white: 0.0, alpha: 0.5)
        
        self.cancelButtonNode = ASButtonNode()
        self.cancelButtonNode.displaysAsynchronously = false
        
        self.contentContainerNode = ASDisplayNode()
        self.contentContainerNode.isOpaque = false
        self.contentContainerNode.clipsToBounds = true
        
        self.contentBackgroundNode = ASImageNode()
        self.contentBackgroundNode.displaysAsynchronously = false
        self.contentBackgroundNode.displayWithoutProcessing = true
        
        self.contentGridNode = GridNode()
        
        self.createActionButtonNode = HighlightTrackingButtonNode()
        self.createActionButtonNode.displaysAsynchronously = false
        self.createActionButtonNode.titleNode.displaysAsynchronously = false
        
        self.addToExistingActionButtonNode = HighlightTrackingButtonNode()
        self.addToExistingActionButtonNode.displaysAsynchronously = false
        self.addToExistingActionButtonNode.titleNode.displaysAsynchronously = false
        
        self.contentTitleNode = ImmediateTextNode()
        self.contentTitleNode.displaysAsynchronously = false
        self.contentTitleNode.maximumNumberOfLines = 1
        self.contentTitleNode.alpha = 0.0
        
        self.contentSeparatorNode = ASDisplayNode()
        self.contentSeparatorNode.isLayerBacked = true
        
        self.createActionSeparatorNode = ASDisplayNode()
        self.createActionSeparatorNode.isLayerBacked = true
        self.createActionSeparatorNode.displaysAsynchronously = false
        
        self.addToExistingActionSeparatorNode = ASDisplayNode()
        self.addToExistingActionSeparatorNode.isLayerBacked = true
        self.addToExistingActionSeparatorNode.displaysAsynchronously = false
        
        self.radialStatus = RadialStatusNode(backgroundNodeColor: .clear)
        self.radialStatus.alpha = 0.0
        self.radialCheck = RadialStatusNode(backgroundNodeColor: .clear)
        self.radialCheck.alpha = 0.0
        
        self.radialStatusBackground = ASImageNode()
        self.radialStatusBackground.isUserInteractionEnabled = false
        self.radialStatusBackground.displaysAsynchronously = false
        self.radialStatusBackground.image = generateCircleImage(diameter: 180.0, lineWidth: 6.0, color: self.presentationData.theme.list.itemAccentColor.withMultipliedAlpha(0.2))
        self.radialStatusBackground.alpha = 0.0
        
        self.radialStatusText = ImmediateTextNode()
        self.radialStatusText.isUserInteractionEnabled = false
        self.radialStatusText.displaysAsynchronously = false
        self.radialStatusText.maximumNumberOfLines = 1
        self.radialStatusText.isAccessibilityElement = false
        self.radialStatusText.alpha = 0.0
        
        self.progressText = ImmediateTextNode()
        self.progressText.isUserInteractionEnabled = false
        self.progressText.displaysAsynchronously = false
        self.progressText.maximumNumberOfLines = 1
        self.progressText.isAccessibilityElement = false
        self.progressText.alpha = 0.0
        
        self.infoText = ImmediateTextNode()
        self.infoText.isUserInteractionEnabled = false
        self.infoText.displaysAsynchronously = false
        self.infoText.maximumNumberOfLines = 4
        self.infoText.isAccessibilityElement = false
        self.infoText.textAlignment = .center
        self.infoText.alpha = 0.0
        
        super.init()
        
        self.interaction = StickerPackPreviewInteraction(playAnimatedStickers: false)
        
        self.backgroundColor = nil
        self.isOpaque = false
        
        self.dimNode.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.dimTapGesture(_:))))
        self.addSubnode(self.dimNode)
        
        self.wrappingScrollNode.view.delegate = self
        self.addSubnode(self.wrappingScrollNode)
        
        self.wrappingScrollNode.addSubnode(self.cancelButtonNode)
        self.cancelButtonNode.addTarget(self, action: #selector(self.cancelButtonPressed), forControlEvents: .touchUpInside)
        
        self.createActionButtonNode.addTarget(self, action: #selector(self.createActionButtonPressed), forControlEvents: .touchUpInside)
        self.addToExistingActionButtonNode.addTarget(self, action: #selector(self.addToExistingActionButtonPressed), forControlEvents: .touchUpInside)
        
        self.wrappingScrollNode.addSubnode(self.contentBackgroundNode)
        
        self.wrappingScrollNode.addSubnode(self.contentContainerNode)
        self.contentContainerNode.addSubnode(self.contentGridNode)
        self.contentContainerNode.addSubnode(self.createActionSeparatorNode)
        self.contentContainerNode.addSubnode(self.createActionButtonNode)
//        self.contentContainerNode.addSubnode(self.addToExistingActionSeparatorNode)
//        self.contentContainerNode.addSubnode(self.addToExistingActionButtonNode)
        self.wrappingScrollNode.addSubnode(self.contentTitleNode)
        self.wrappingScrollNode.addSubnode(self.contentSeparatorNode)
        
        self.wrappingScrollNode.addSubnode(self.radialStatusBackground)
        self.wrappingScrollNode.addSubnode(self.radialStatus)
        self.wrappingScrollNode.addSubnode(self.radialCheck)
        self.wrappingScrollNode.addSubnode(self.radialStatusText)
        self.wrappingScrollNode.addSubnode(self.progressText)
        self.wrappingScrollNode.addSubnode(self.infoText)
        
        self.createActionButtonNode.setTitle(self.presentationData.strings.ImportStickerPack_CreateNewStickerSet, with: Font.regular(20.0), with: self.presentationData.theme.actionSheet.controlAccentColor, for: .normal)
        self.addToExistingActionButtonNode.setTitle(self.presentationData.strings.ImportStickerPack_AddToExistingStickerSet, with: Font.regular(20.0), with: self.presentationData.theme.actionSheet.controlAccentColor, for: .normal)
        
        self.contentGridNode.presentationLayoutUpdated = { [weak self] presentationLayout, transition in
            self?.gridPresentationLayoutUpdated(presentationLayout, transition: transition)
        }
    }
    
    deinit {
        self.disposable.dispose()
        self.shortNameSuggestionDisposable.dispose()
    }
    
    override func didLoad() {
        super.didLoad()
        
        if #available(iOSApplicationExtension 11.0, iOS 11.0, *) {
            self.wrappingScrollNode.view.contentInsetAdjustmentBehavior = .never
        }
        self.contentGridNode.view.addGestureRecognizer(PeekControllerGestureRecognizer(contentAtPoint: { [weak self] point -> Signal<(UIView, CGRect, PeekControllerContent)?, NoError>? in
            if let strongSelf = self {
                if let itemNode = strongSelf.contentGridNode.itemNodeAtPoint(point) as? StickerPackPreviewGridItemNode, let item = itemNode.stickerPackItem {
                    var menuItems: [ContextMenuItem] = []
                    if strongSelf.currentItems.count > 1 {
                        menuItems.append(.action(ContextMenuActionItem(text: strongSelf.presentationData.strings.ImportStickerPack_RemoveFromImport, textColor: .destructive, icon: { theme in generateTintedImage(image: UIImage(bundleImageName: "Chat/Context Menu/Delete"), color: theme.contextMenu.destructiveColor) }, action: { [weak self] c, f in
                            f(.dismissWithoutContent)
                            
                            if let strongSelf = self {
                                var updatedItems = strongSelf.currentItems
                                updatedItems.removeAll(where: { $0.stickerItem.uuid == item.uuid })
                                strongSelf.pendingItems = updatedItems
                                
                                if let (layout, navigationHeight) = strongSelf.containerLayout {
                                    strongSelf.containerLayoutUpdated(layout, navigationBarHeight: navigationHeight, transition: .animated(duration: 0.3, curve: .easeInOut))
                                }
                            }
                        })))
                    }
                    return .single((itemNode.view, itemNode.bounds, StickerPreviewPeekContent(context: strongSelf.context, item: item, menu: menuItems)))
                }
            }
            return nil
        }, present: { [weak self] content, sourceView, sourceRect in
            if let strongSelf = self {
                let controller = PeekController(presentationData: strongSelf.presentationData, content: content, sourceView: {
                    return (sourceView, sourceRect)
                })
                controller.visibilityUpdated = { [weak self] visible in
                    if let strongSelf = self {
                        strongSelf.contentGridNode.forceHidden = visible
                    }
                }
                strongSelf.presentInGlobalOverlay?(controller, nil)
                return controller
            }
            return nil
        }, updateContent: { [weak self] content in
            if let strongSelf = self {
                var item: ImportStickerPack.Sticker?
                if let content = content as? StickerPreviewPeekContent {
                    item = content.item
                }
                strongSelf.updatePreviewingItem(item: item, animated: true)
            }
        }, activateBySingleTap: true))
        
        self.updatePresentationData(self.presentationData)
    }
    
    func updatePresentationData(_ presentationData: PresentationData) {
        self.presentationData = presentationData
        
        let theme = presentationData.theme
        let solidBackground = generateImage(CGSize(width: 1.0, height: 1.0), rotatedContext: { size, context in
            context.clear(CGRect(origin: CGPoint(), size: size))
            context.setFillColor(theme.actionSheet.opaqueItemBackgroundColor.cgColor)
            context.fill(CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
        })?.stretchableImage(withLeftCapWidth: 16, topCapHeight: 1)
        
        let highlightedSolidBackground = generateImage(CGSize(width: 1.0, height: 1.0), rotatedContext: { size, context in
            context.clear(CGRect(origin: CGPoint(), size: size))
            context.setFillColor(theme.actionSheet.opaqueItemHighlightedBackgroundColor.cgColor)
            context.fill(CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
        })?.stretchableImage(withLeftCapWidth: 16, topCapHeight: 1)
        
        let halfRoundedBackground = generateImage(CGSize(width: 32.0, height: 32.0), rotatedContext: { size, context in
            context.clear(CGRect(origin: CGPoint(), size: size))
            context.setFillColor(theme.actionSheet.opaqueItemBackgroundColor.cgColor)
            context.fillEllipse(in: CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
            context.fill(CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height / 2.0)))
        })?.stretchableImage(withLeftCapWidth: 16, topCapHeight: 1)
        
        let highlightedHalfRoundedBackground = generateImage(CGSize(width: 32.0, height: 32.0), rotatedContext: { size, context in
            context.clear(CGRect(origin: CGPoint(), size: size))
            context.setFillColor(theme.actionSheet.opaqueItemHighlightedBackgroundColor.cgColor)
            context.fillEllipse(in: CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
            context.fill(CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height / 2.0)))
        })?.stretchableImage(withLeftCapWidth: 16, topCapHeight: 1)
        
        let roundedBackground = generateStretchableFilledCircleImage(radius: 16.0, color: presentationData.theme.actionSheet.opaqueItemBackgroundColor)
        let highlightedRoundedBackground = generateStretchableFilledCircleImage(radius: 16.0, color: presentationData.theme.actionSheet.opaqueItemHighlightedBackgroundColor)
        
        self.contentBackgroundNode.image = roundedBackground
        
        self.cancelButtonNode.setBackgroundImage(roundedBackground, for: .normal)
        self.cancelButtonNode.setBackgroundImage(highlightedRoundedBackground, for: .highlighted)

        if self.addToExistingActionButtonNode.supernode != nil {
            self.createActionButtonNode.setBackgroundImage(solidBackground, for: .normal)
            self.createActionButtonNode.setBackgroundImage(highlightedSolidBackground, for: .highlighted)
        } else {
            self.createActionButtonNode.setBackgroundImage(halfRoundedBackground, for: .normal)
            self.createActionButtonNode.setBackgroundImage(highlightedHalfRoundedBackground, for: .highlighted)
        }
        
        self.addToExistingActionButtonNode.setBackgroundImage(halfRoundedBackground, for: .normal)
        self.addToExistingActionButtonNode.setBackgroundImage(highlightedHalfRoundedBackground, for: .highlighted)
        
        self.contentSeparatorNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemSeparatorColor
        self.createActionSeparatorNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemSeparatorColor
        self.addToExistingActionSeparatorNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemSeparatorColor
        
        self.cancelButtonNode.setTitle(presentationData.strings.Common_Cancel, with: Font.medium(20.0), with: presentationData.theme.actionSheet.standardActionTextColor, for: .normal)
        
        self.contentTitleNode.linkHighlightColor = presentationData.theme.actionSheet.controlAccentColor.withAlphaComponent(0.5)
        
        if let (layout, navigationBarHeight) = self.containerLayout {
            self.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: .immediate)
        }
    }
    
    private var hadProgress = false
    func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        self.containerLayout = (layout, navigationBarHeight)
        
        transition.updateFrame(node: self.wrappingScrollNode, frame: CGRect(origin: CGPoint(), size: layout.size))
        
        var insets = layout.insets(options: [.statusBar])
        insets.top = max(10.0, insets.top)
        let cleanInsets = layout.insets(options: [.statusBar])
        
        let hasAddToExistingButton = self.addToExistingActionButtonNode.supernode != nil
        
        transition.updateFrame(node: self.dimNode, frame: CGRect(origin: CGPoint(), size: layout.size))
        
        var bottomInset: CGFloat = 10.0 + cleanInsets.bottom
        if insets.bottom > 0 {
            bottomInset -= 12.0
        }
        
        let buttonHeight: CGFloat = 57.0
        let sectionSpacing: CGFloat = 8.0
        let titleAreaHeight: CGFloat = 51.0
        
        let width = horizontalContainerFillingSizeForLayout(layout: layout, sideInset: 10.0 + layout.safeInsets.left)
        
        let sideInset = floor((layout.size.width - width) / 2.0)
        
        transition.updateFrame(node: self.cancelButtonNode, frame: CGRect(origin: CGPoint(x: sideInset, y: layout.size.height - bottomInset - buttonHeight), size: CGSize(width: width, height: buttonHeight)))
        
        let maximumContentHeight = layout.size.height - insets.top - bottomInset - buttonHeight - sectionSpacing
        
        let contentContainerFrame = CGRect(origin: CGPoint(x: sideInset, y: insets.top), size: CGSize(width: width, height: maximumContentHeight))
        let contentFrame = contentContainerFrame.insetBy(dx: 12.0, dy: 0.0)
        
        var transaction: StickerPackPreviewGridTransaction?
                
        var forceTitleUpdate = false
        if self.progress != nil && !self.hadProgress {
            self.hadProgress = true
            forceTitleUpdate = true
        }
        
        let itemsPerRow: Int
        if let stickerPack = self.stickerPack, case .emoji = stickerPack.type {
            itemsPerRow = 8
        } else {
            itemsPerRow = 4
        }
        if let stickerPack = self.stickerPack, self.currentItems.isEmpty || self.currentItems.count != self.pendingItems.count || self.pendingItems != self.currentItems || forceTitleUpdate {
            let previousItems = self.currentItems
            self.currentItems = self.pendingItems
            
            let titleFont = Font.medium(20.0)
            let title: String
            if let _ = self.progress {
                if case .emoji = stickerPack.type {
                    title = self.presentationData.strings.ImportStickerPack_ImportingEmojis
                } else {
                    title = self.presentationData.strings.ImportStickerPack_ImportingStickers
                }
            } else {
                if case .emoji = stickerPack.type {
                    title = self.presentationData.strings.ImportStickerPack_EmojiCount(Int32(self.currentItems.count))
                } else {
                    title = self.presentationData.strings.ImportStickerPack_StickerCount(Int32(self.currentItems.count))
                }
            }
            self.contentTitleNode.attributedText = stringWithAppliedEntities(title, entities: [], baseColor: self.presentationData.theme.actionSheet.primaryTextColor, linkColor: self.presentationData.theme.actionSheet.controlAccentColor, baseFont: titleFont, linkFont: titleFont, boldFont: titleFont, italicFont: titleFont, boldItalicFont: titleFont, fixedFont: titleFont, blockQuoteFont: titleFont, message: nil)

            if case .emoji = stickerPack.type {
                self.createActionButtonNode.setTitle(self.presentationData.strings.ImportStickerPack_CreateNewEmojiPack, with: Font.regular(20.0), with: self.presentationData.theme.actionSheet.controlAccentColor, for: .normal)
            } else {
                self.createActionButtonNode.setTitle(self.presentationData.strings.ImportStickerPack_CreateNewStickerSet, with: Font.regular(20.0), with: self.presentationData.theme.actionSheet.controlAccentColor, for: .normal)
            }
            
            if !forceTitleUpdate {
                transaction = StickerPackPreviewGridTransaction(previousList: previousItems, list: self.currentItems, account: self.context.account, interaction: self.interaction, theme: self.presentationData.theme)
            }
        }
        let itemCount = self.currentItems.count
        
        let titleSize = self.contentTitleNode.updateLayout(CGSize(width: contentContainerFrame.size.width - 24.0, height: CGFloat.greatestFiniteMagnitude))
        let titleFrame = CGRect(origin: CGPoint(x: contentContainerFrame.minX + floor((contentContainerFrame.size.width - titleSize.width) / 2.0), y: self.contentBackgroundNode.frame.minY + 15.0), size: titleSize)
        let deltaTitlePosition = CGPoint(x: titleFrame.midX - self.contentTitleNode.frame.midX, y: titleFrame.midY - self.contentTitleNode.frame.midY)
        self.contentTitleNode.frame = titleFrame
        transition.animatePosition(node: self.contentTitleNode, from: CGPoint(x: titleFrame.midX + deltaTitlePosition.x, y: titleFrame.midY + deltaTitlePosition.y))
        
        transition.updateFrame(node: self.contentTitleNode, frame: titleFrame)
        transition.updateFrame(node: self.contentSeparatorNode, frame: CGRect(origin: CGPoint(x: contentContainerFrame.minX, y: self.contentBackgroundNode.frame.minY + titleAreaHeight), size: CGSize(width: contentContainerFrame.size.width, height: UIScreenPixel)))
        
        
        let itemWidth = floor(contentFrame.size.width / CGFloat(itemsPerRow))
        let rowCount = itemCount / itemsPerRow + (itemCount % itemsPerRow != 0 ? 1 : 0)
        
        let minimallyRevealedRowCount: CGFloat = 3.5
        let initiallyRevealedRowCount = min(minimallyRevealedRowCount, CGFloat(rowCount))
        
        var bottomGridInset = hasAddToExistingButton ? 2.0 * buttonHeight : buttonHeight
        if let _ = self.progress {
            bottomGridInset += 210.0
        }
        let topInset = max(0.0, contentFrame.size.height - initiallyRevealedRowCount * itemWidth - titleAreaHeight - bottomGridInset)
        transition.updateFrame(node: self.contentContainerNode, frame: contentContainerFrame)
        
        let createButtonOffset = hasAddToExistingButton ? 2.0 * buttonHeight : buttonHeight
        transition.updateFrame(node: self.createActionButtonNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - createButtonOffset), size: CGSize(width: contentContainerFrame.size.width, height: buttonHeight)))
        transition.updateFrame(node: self.createActionSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - createButtonOffset - UIScreenPixel), size: CGSize(width: contentContainerFrame.size.width, height: UIScreenPixel)))

        transition.updateFrame(node: self.addToExistingActionButtonNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - buttonHeight), size: CGSize(width: contentContainerFrame.size.width, height: buttonHeight)))
        transition.updateFrame(node: self.addToExistingActionSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - buttonHeight - UIScreenPixel), size: CGSize(width: contentContainerFrame.size.width, height: UIScreenPixel)))
        
        let gridSize = CGSize(width: contentFrame.size.width, height: max(32.0, contentFrame.size.height - titleAreaHeight))
        
        self.contentGridNode.transaction(GridNodeTransaction(deleteItems: transaction?.deletions ?? [], insertItems: transaction?.insertions ?? [], updateItems: transaction?.updates ?? [], scrollToItem: nil, updateLayout: GridNodeUpdateLayout(layout: GridNodeLayout(size: gridSize, insets: UIEdgeInsets(top: topInset, left: 0.0, bottom: bottomGridInset, right: 0.0), preloadSize: 80.0, type: .fixed(itemSize: CGSize(width: itemWidth, height: itemWidth), fillWidth: nil, lineSpacing: 0.0, itemSpacing: nil)), transition: transition), itemTransition: .immediate, stationaryItems: .none, updateFirstIndexInSectionOffset: nil), completion: { _ in })
        transition.updateFrame(node: self.contentGridNode, frame: CGRect(origin: CGPoint(x: floor((contentContainerFrame.size.width - contentFrame.size.width) / 2.0), y: titleAreaHeight), size: gridSize))
                        
        transition.updateAlpha(node: self.contentGridNode, alpha: self.progress == nil ? 1.0 : 0.0)
        
        var effectiveProgress: CGFloat = 0.0
        var count: Int32 = 0
        var total: Int32 = 0
        
        var hasProgress = false
        if let (progress, progressCount, progressTotal) = self.progress {
            effectiveProgress = progress
            count = progressCount
            total = progressTotal
            hasProgress = true
        }
           
        let availableHeight: CGFloat = 330.0
        var radialStatusSize = CGSize(width: 186.0, height: 186.0)
        var maxIconStatusSpacing: CGFloat = 46.0
        var maxProgressTextSpacing: CGFloat = 33.0
        var progressStatusSpacing: CGFloat = 14.0
        var statusButtonSpacing: CGFloat = 19.0
        
        var maxK: CGFloat = availableHeight / (30.0 + maxProgressTextSpacing + 320.0)
        maxK = max(0.5, min(1.0, maxK))
        
        radialStatusSize.width = floor(radialStatusSize.width * maxK)
        radialStatusSize.height = floor(radialStatusSize.height * maxK)
        maxIconStatusSpacing = floor(maxIconStatusSpacing * maxK)
        maxProgressTextSpacing = floor(maxProgressTextSpacing * maxK)
        progressStatusSpacing = floor(progressStatusSpacing * maxK)
        statusButtonSpacing = floor(statusButtonSpacing * maxK)
        
        var updateRadialBackround = false
        if let width = self.radialStatusBackground.image?.size.width {
            if abs(width - radialStatusSize.width) > 0.01 {
                updateRadialBackround = true
            }
        } else {
            updateRadialBackround = true
        }
        
        if updateRadialBackround {
            self.radialStatusBackground.image = generateCircleImage(diameter: radialStatusSize.width, lineWidth: 6.0, color: self.presentationData.theme.list.itemAccentColor.withMultipliedAlpha(0.2))
        }
        
        let contentOrigin = self.contentBackgroundNode.frame.minY + 72.0
        if hasProgress {
            transition.updateAlpha(node: self.radialStatusText, alpha: 1.0)
            transition.updateAlpha(node: self.progressText, alpha: 1.0)
            transition.updateAlpha(node: self.radialStatus, alpha: 1.0)
            transition.updateAlpha(node: self.infoText, alpha: 1.0)
            transition.updateAlpha(node: self.radialCheck, alpha: 1.0)
            transition.updateAlpha(node: self.radialStatusBackground, alpha: 1.0)
            transition.updateAlpha(node: self.createActionButtonNode, alpha: 0.0)
            transition.updateAlpha(node: self.contentSeparatorNode, alpha: 0.0)
            transition.updateAlpha(node: self.createActionSeparatorNode, alpha: 0.0)
            transition.updateAlpha(node: self.addToExistingActionButtonNode, alpha: 0.0)
            transition.updateAlpha(node: self.addToExistingActionSeparatorNode, alpha: 0.0)
        }
        
        self.radialStatusText.attributedText = NSAttributedString(string: "\(Int(effectiveProgress * 100.0))%", font: Font.with(size: floor(36.0 * maxK), design: .round, weight: .semibold), textColor: self.presentationData.theme.list.itemPrimaryTextColor)
        let radialStatusTextSize = self.radialStatusText.updateLayout(CGSize(width: 200.0, height: .greatestFiniteMagnitude))
        
        self.progressText.attributedText = NSAttributedString(string:  self.presentationData.strings.ImportStickerPack_Of(String(count), String(total)).string, font: Font.semibold(17.0), textColor: self.presentationData.theme.list.itemPrimaryTextColor)
        let progressTextSize = self.progressText.updateLayout(CGSize(width: layout.size.width - 16.0 * 2.0, height: .greatestFiniteMagnitude))
        
        self.infoText.attributedText = NSAttributedString(string: self.presentationData.strings.ImportStickerPack_InProgress, font: Font.regular(17.0), textColor: self.presentationData.theme.list.itemSecondaryTextColor)
        let infoTextSize = self.infoText.updateLayout(CGSize(width: layout.size.width - 16.0 * 2.0, height: .greatestFiniteMagnitude))
        
        transition.updateFrame(node: self.radialStatus, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - radialStatusSize.width) / 2.0), y: contentOrigin), size: radialStatusSize))
        let checkSize: CGFloat = 130.0
        transition.updateFrame(node: self.radialCheck, frame: CGRect(origin: CGPoint(x: self.radialStatus.frame.minX + floor((self.radialStatus.frame.width - checkSize) / 2.0), y: self.radialStatus.frame.minY + floor((self.radialStatus.frame.height - checkSize) / 2.0)), size: CGSize(width: checkSize, height: checkSize)))
        transition.updateFrame(node: self.radialStatusBackground, frame: self.radialStatus.frame)
        
        transition.updateFrame(node: self.radialStatusText, frame: CGRect(origin: CGPoint(x: self.radialStatus.frame.minX + floor((self.radialStatus.frame.width - radialStatusTextSize.width) / 2.0), y: self.radialStatus.frame.minY + floor((self.radialStatus.frame.height - radialStatusTextSize.height) / 2.0)), size: radialStatusTextSize))
        
        transition.updateFrame(node: self.progressText, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - progressTextSize.width) / 2.0), y: (self.radialStatus.frame.maxY + maxProgressTextSpacing)), size: progressTextSize))
        
        transition.updateFrame(node: self.infoText, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - infoTextSize.width) / 2.0), y: (self.progressText.frame.maxY + maxProgressTextSpacing) + 10.0), size: infoTextSize))
    }
    
    private func gridPresentationLayoutUpdated(_ presentationLayout: GridNodeCurrentPresentationLayout, transition: ContainedViewLayoutTransition) {
        if let (layout, _) = self.containerLayout {
            var insets = layout.insets(options: [.statusBar])
            insets.top = max(10.0, insets.top)
            let cleanInsets = layout.insets(options: [.statusBar])
            
            var bottomInset: CGFloat = 10.0 + cleanInsets.bottom
            if insets.bottom > 0 {
                bottomInset -= 12.0
            }
            
            let buttonHeight: CGFloat = 57.0
            let sectionSpacing: CGFloat = 8.0
            let titleAreaHeight: CGFloat = 51.0
            
            let width = horizontalContainerFillingSizeForLayout(layout: layout, sideInset: 10.0 + layout.safeInsets.left)
            
            let sideInset = floor((layout.size.width - width) / 2.0)
            
            let maximumContentHeight = layout.size.height - insets.top - bottomInset - buttonHeight - sectionSpacing
            let contentFrame = CGRect(origin: CGPoint(x: sideInset, y: insets.top), size: CGSize(width: width, height: maximumContentHeight))
             
            var backgroundFrame = CGRect(origin: CGPoint(x: contentFrame.minX, y: contentFrame.minY - presentationLayout.contentOffset.y), size: contentFrame.size)
            if backgroundFrame.minY < contentFrame.minY {
                backgroundFrame.origin.y = contentFrame.minY
            }
            if backgroundFrame.maxY > contentFrame.maxY {
                backgroundFrame.size.height += contentFrame.maxY - backgroundFrame.maxY
            }
            if backgroundFrame.size.height < buttonHeight + 32.0 {
                backgroundFrame.origin.y -= buttonHeight + 32.0 - backgroundFrame.size.height
                backgroundFrame.size.height = buttonHeight + 32.0
            }
            let backgroundDeltaY = backgroundFrame.minY - self.contentBackgroundNode.frame.minY
            transition.updateFrame(node: self.contentBackgroundNode, frame: backgroundFrame)
            transition.animatePositionAdditive(node: self.contentGridNode, offset: CGPoint(x: 0.0, y: -backgroundDeltaY))
            
            let titleSize = self.contentTitleNode.bounds.size
            let titleFrame = CGRect(origin: CGPoint(x: contentFrame.minX + floor((contentFrame.size.width - titleSize.width) / 2.0), y: backgroundFrame.minY + 15.0), size: titleSize)
            transition.updateFrame(node: self.contentTitleNode, frame: titleFrame)
        
            transition.updateFrame(node: self.contentSeparatorNode, frame: CGRect(origin: CGPoint(x: contentFrame.minX, y: backgroundFrame.minY + titleAreaHeight), size: CGSize(width: contentFrame.size.width, height: UIScreenPixel)))
            
            if CGFloat(0.0).isLessThanOrEqualTo(presentationLayout.contentOffset.y) {
                self.contentSeparatorNode.alpha = 1.0
            } else {
                self.contentSeparatorNode.alpha = 0.0
            }
        }
    }
    
    @objc func dimTapGesture(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state {
            self.cancelButtonPressed()
        }
    }
    
    @objc func cancelButtonPressed() {
        self.disposable.set(nil)
        self.cancel?()
    }
    
    private func createStickerSet(title: String, shortName: String) {
        guard let stickerPack = self.stickerPack else {
            return
        }
        
        var stickers: [ImportSticker] = []
        for item in self.currentItems {
            var dimensions = PixelDimensions(width: 512, height: 512)
            if case let .image(data) = item.stickerItem.content, let image = UIImage(data: data) {
                dimensions = PixelDimensions(image.size)
            }
            if let resource = self.uploadedStickerResources[item.stickerItem.uuid] {
                if let localResource = item.stickerItem.resource {
                    self.context.account.postbox.mediaBox.copyResourceData(from: localResource._asResource().id, to: resource._asResource().id)
                }
                stickers.append(ImportSticker(resource: resource._asResource(), emojis: item.stickerItem.emojis, dimensions: dimensions, mimeType: item.stickerItem.mimeType, keywords: item.stickerItem.keywords))
            } else if let resource = item.stickerItem.resource {
                stickers.append(ImportSticker(resource: resource._asResource(), emojis: item.stickerItem.emojis, dimensions: dimensions, mimeType: item.stickerItem.mimeType, keywords: item.stickerItem.keywords))
            }
        }
        var thumbnailSticker: ImportSticker?
        if let thumbnail = stickerPack.thumbnail {
            var dimensions = PixelDimensions(width: 512, height: 512)
            if case let .image(data) = thumbnail.content, let image = UIImage(data: data) {
                dimensions = PixelDimensions(image.size)
            }
            let resource = LocalFileMediaResource(fileId: Int64.random(in: Int64.min ... Int64.max))
            self.context.account.postbox.mediaBox.storeResourceData(resource.id, data: thumbnail.data)
            thumbnailSticker = ImportSticker(resource: resource, emojis: [], dimensions: dimensions, mimeType: thumbnail.mimeType, keywords: thumbnail.keywords)
        }
        
        let firstStickerItem = thumbnailSticker ?? stickers.first
        
        self.progress = (0.0, 0, Int32(stickers.count))
        self.radialStatus.transitionToState(.progress(color: self.presentationData.theme.list.itemAccentColor, lineWidth: 6.0, value: max(0.01, 0.0), cancelEnabled: false, animateRotation: false), animated: false, synchronous: true, completion: {})
        if let (layout, navigationBarHeight) = self.containerLayout {
            self.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition:  .animated(duration: 0.2, curve: .easeInOut))
        }
        
        self.disposable.set((self.context.engine.stickers.createStickerSet(title: title, shortName: shortName, stickers: stickers, thumbnail: thumbnailSticker, type: stickerPack.type.importType, software: stickerPack.software)
        |> deliverOnMainQueue).start(next: { [weak self] status in
            if let strongSelf = self {
                if case let .complete(info, items) = status {
                    if let (_, _, count) = strongSelf.progress {
                        strongSelf.progress = (1.0, count, count)
                        var animated = false
                        if case .image = stickerPack.type.contentType {
                            animated = true
                        }
                        strongSelf.radialStatus.transitionToState(.progress(color: strongSelf.presentationData.theme.list.itemAccentColor, lineWidth: 6.0, value: 1.0, cancelEnabled: false, animateRotation: false), animated: animated, synchronous: true, completion: {})
                        if let (layout, navigationBarHeight) = strongSelf.containerLayout {
                            strongSelf.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: .immediate)
                        }
                    }
                    let _ = strongSelf.context.engine.stickers.addStickerPackInteractively(info: info, items: items).start()
                    
                    strongSelf.radialCheck.transitionToState(.progress(color: .clear, lineWidth: 6.0, value: 1.0, cancelEnabled: false, animateRotation: false), animated: false, synchronous: true, completion: {})
                    strongSelf.radialCheck.transitionToState(.check(strongSelf.presentationData.theme.list.itemAccentColor), animated: true, synchronous: true, completion: {})
                    strongSelf.radialStatus.layer.animateScale(from: 1.0, to: 1.05, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.linear.rawValue, removeOnCompletion: false, additive: false, completion: { [weak self] _ in
                        guard let strongSelf = self else {
                            return
                        }
                        strongSelf.radialStatus.layer.animateScale(from: 1.05, to: 1.0, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.easeOut.rawValue, removeOnCompletion: false, additive: false)
                    })
                    strongSelf.radialStatusBackground.layer.animateScale(from: 1.0, to: 1.05, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.linear.rawValue, removeOnCompletion: false, additive: false, completion: { [weak self] _ in
                        guard let strongSelf = self else {
                            return
                        }
                        strongSelf.radialStatusBackground.layer.animateScale(from: 1.05, to: 1.0, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.easeOut.rawValue, removeOnCompletion: false, additive: false)
                    })
                    strongSelf.radialCheck.layer.animateScale(from: 1.0, to: 1.05, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.linear.rawValue, removeOnCompletion: false, additive: false, completion: { [weak self] _ in
                        guard let strongSelf = self else {
                            return
                        }
                        strongSelf.radialCheck.layer.animateScale(from: 1.05, to: 1.0, duration: 0.07, delay: 0.0, timingFunction: CAMediaTimingFunctionName.easeOut.rawValue, removeOnCompletion: false, additive: false)
                    })
                    strongSelf.radialStatusText.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2, removeOnCompletion: false)
                    strongSelf.radialStatusText.layer.animateScale(from: 1.0, to: 0.0, duration: 0.2, removeOnCompletion: false)
                    
                    strongSelf.cancelButtonNode.isUserInteractionEnabled = false
                    
                    let navigationController = strongSelf.navigationController
                    let context = strongSelf.context
                    
                    Queue.mainQueue().after(1.0) {
                        let firstItem: StickerPackItem? = firstStickerItem?.stickerPackItem
                        strongSelf.presentInGlobalOverlay?(UndoOverlayController(presentationData: strongSelf.presentationData, content: .stickersModified(title: strongSelf.presentationData.strings.StickerPackActionInfo_AddedTitle, text: strongSelf.presentationData.strings.StickerPackActionInfo_AddedText(info.title).string, undo: false, info: info, topItem: firstItem ?? items.first, context: strongSelf.context), elevatedLayout: false, action: { action in
                            if case .info = action {
                                (navigationController?.viewControllers.last as? ViewController)?.present(StickerPackScreen(context: context, mode: .settings, mainStickerPack: .id(id: info.id.id, accessHash: info.accessHash), stickerPacks: [], parentNavigationController: navigationController, actionPerformed: { _ in
                            }), in: .window(.root))
                            }
                            return true
                        }), nil)
                        strongSelf.cancel?()
                    }
                } else if case let .progress(progress, count, total) = status {
                    strongSelf.progress = (CGFloat(progress), count, total)
                    strongSelf.radialStatus.transitionToState(.progress(color: strongSelf.presentationData.theme.list.itemAccentColor, lineWidth: 6.0, value: max(0.01, CGFloat(progress)), cancelEnabled: false, animateRotation: false), animated: true, synchronous: true, completion: {})
                    if let (layout, navigationBarHeight) = strongSelf.containerLayout {
                        strongSelf.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: .immediate)
                    }
                }
            }
        }, error: { _ in
        }))
    }
    
    @objc private func createActionButtonPressed() {
        var proceedImpl: ((String, String?) -> Void)?
        let titleController = importStickerPackTitleController(context: self.context, title: self.presentationData.strings.ImportStickerPack_ChooseName, text: self.presentationData.strings.ImportStickerPack_ChooseNameDescription, placeholder: self.presentationData.strings.ImportStickerPack_NamePlaceholder, value: nil, maxLength: 128, apply: { [weak self] title in
            if let strongSelf = self, let title = title {
                strongSelf.shortNameSuggestionDisposable.set((strongSelf.context.engine.stickers.getStickerSetShortNameSuggestion(title: title)
                |> deliverOnMainQueue).start(next: { suggestedShortName in
                    proceedImpl?(title, suggestedShortName)
                }))
            }
        }, cancel: { [weak self] in
            if let strongSelf = self {
                strongSelf.shortNameSuggestionDisposable.set(nil)
            }
        })
        proceedImpl = { [weak titleController, weak self] title, suggestedShortName in
            guard let strongSelf = self else {
                return
            }
            let controller = importStickerPackShortNameController(context: strongSelf.context, title: strongSelf.presentationData.strings.ImportStickerPack_ChooseLink, text: strongSelf.presentationData.strings.ImportStickerPack_ChooseLinkDescription, placeholder: "", value: suggestedShortName, maxLength: 60, existingAlertController: titleController, apply: { [weak self] shortName in
                if let shortName = shortName {
                    self?.createStickerSet(title: title, shortName: shortName)
                }
            })
            strongSelf.present?(controller, nil)
        }
        self.present?(titleController, nil)
    }
    
    @objc private func addToExistingActionButtonPressed() {
        
    }
    
    func animateIn() {
        self.dimNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.4)
        
        let offset = self.bounds.size.height - self.contentBackgroundNode.frame.minY
        
        let dimPosition = self.dimNode.layer.position
        self.dimNode.layer.animatePosition(from: CGPoint(x: dimPosition.x, y: dimPosition.y - offset), to: dimPosition, duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring)
        self.layer.animateBoundsOriginYAdditive(from: -offset, to: 0.0, duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring)
    }
    
    func animateOut(completion: (() -> Void)? = nil) {
        var dimCompleted = false
        var offsetCompleted = false
        
        let internalCompletion: () -> Void = { [weak self] in
            if let strongSelf = self, dimCompleted && offsetCompleted {
                strongSelf.dismiss?()
            }
            completion?()
        }
        
        self.dimNode.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, removeOnCompletion: false, completion: { _ in
            dimCompleted = true
            internalCompletion()
        })
        
        let offset = self.bounds.size.height - self.contentBackgroundNode.frame.minY
        let dimPosition = self.dimNode.layer.position
        self.dimNode.layer.animatePosition(from: dimPosition, to: CGPoint(x: dimPosition.x, y: dimPosition.y - offset), duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false)
        self.layer.animateBoundsOriginYAdditive(from: 0.0, to: -offset, duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { _ in
            offsetCompleted = true
            internalCompletion()
        })
    }
    
    func updateStickerPack(_ stickerPack: ImportStickerPack, verifiedStickers: Set<UUID>, declinedStickers: Set<UUID>, uploadedStickerResources: [UUID: EngineMediaResource]) {
        self.stickerPack = stickerPack
        self.uploadedStickerResources = uploadedStickerResources
        var updatedItems: [StickerPackPreviewGridEntry] = []
        for item in stickerPack.stickers {
            if declinedStickers.contains(item.uuid) {
                continue
            }
            if let resource = self.stickerResources[item.uuid] {
                item.resource = resource
            } else {
                let resource = LocalFileMediaResource(fileId: Int64.random(in: Int64.min ... Int64.max))
                self.context.account.postbox.mediaBox.storeResourceData(resource.id, data: item.data)
                item.resource = EngineMediaResource(resource)
                self.stickerResources[item.uuid] = EngineMediaResource(resource)
            }
            var isInitiallyVerified = false
            if case .image = item.content {
                isInitiallyVerified = true
            }
            updatedItems.append(StickerPackPreviewGridEntry(index: updatedItems.count, stickerItem: item, isVerified: isInitiallyVerified || verifiedStickers.contains(item.uuid)))
        }
        self.pendingItems = updatedItems
      
        if case .image = stickerPack.type.contentType {
        } else {
            self.stickerPackReady = stickerPack.stickers.count == (verifiedStickers.count + declinedStickers.count) && updatedItems.count > 0
        }
        
        self.interaction.playAnimatedStickers = true
                
        if let _ = self.containerLayout {
            self.dequeueUpdateStickerPack()
        }
    }
    
    func dequeueUpdateStickerPack() {
        if let (layout, navigationBarHeight) = self.containerLayout, let _ = self.stickerPack {
            let transition: ContainedViewLayoutTransition
            if self.didSetReady {
                transition = .animated(duration: 0.4, curve: .spring)
            } else {
                transition = .immediate
            }
            
            self.contentTitleNode.alpha = 1.0
            self.contentTitleNode.layer.animateAlpha(from: self.contentTitleNode.alpha, to: 1.0, duration: 0.2)
            
            self.contentGridNode.alpha = 1.0
            self.contentGridNode.layer.animateAlpha(from: self.contentGridNode.alpha, to: 1.0, duration: 0.2)
            
            let buttonTransition: ContainedViewLayoutTransition = .animated(duration: 0.3, curve: .easeInOut)
            buttonTransition.updateAlpha(node: self.createActionButtonNode, alpha: self.stickerPackReady ? 1.0 : 0.3)
            buttonTransition.updateAlpha(node: self.addToExistingActionButtonNode, alpha: self.stickerPackReady ? 1.0 : 0.3)
            
            self.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
            
            if !self.didSetReady {
                self.didSetReady = true
                self.ready.set(.single(true))
            }
        }
    }
    
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        if let result = self.createActionButtonNode.hitTest(self.createActionButtonNode.convert(point, from: self), with: event) {
            return result
        }
        if self.bounds.contains(point) {
            if !self.contentBackgroundNode.bounds.contains(self.convert(point, to: self.contentBackgroundNode)) && !self.cancelButtonNode.bounds.contains(self.convert(point, to: self.cancelButtonNode)) {
                return self.dimNode.view
            }
        }
        return super.hitTest(point, with: event)
    }
    
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        let contentOffset = scrollView.contentOffset
        let additionalTopHeight = max(0.0, -contentOffset.y)
        
        if additionalTopHeight >= 30.0 {
            self.cancelButtonPressed()
        }
    }
    
    private func updatePreviewingItem(item: ImportStickerPack.Sticker?, animated: Bool) {
        if self.interaction.previewedItem !== item {
            self.interaction.previewedItem = item
            
            self.contentGridNode.forEachItemNode { itemNode in
                if let itemNode = itemNode as? StickerPackPreviewGridItemNode {
                    itemNode.updatePreviewing(animated: animated)
                }
            }
        }
    }
}