import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import Postbox
import TelegramCore
import SyncCore
import TelegramPresentationData
import TelegramUIPreferences
import MergeLists
import ActivityIndicator
import TextFormat
import AccountContext

private struct StickerPackPreviewGridEntry: Comparable, Identifiable {
    let index: Int
    let stickerItem: StickerPackItem
    
    var stableId: MediaId {
        return self.stickerItem.file.fileId
    }
    
    static func <(lhs: StickerPackPreviewGridEntry, rhs: StickerPackPreviewGridEntry) -> Bool {
        return lhs.index < rhs.index
    }
    
    func item(account: Account, interaction: StickerPackPreviewInteraction) -> StickerPackPreviewGridItem {
        return StickerPackPreviewGridItem(account: account, stickerItem: self.stickerItem, interaction: interaction)
    }
}

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

final class StickerPackPreviewControllerNode: ViewControllerTracingNode, UIScrollViewDelegate {
    private weak var controller: StickerPackPreviewController?
    private let context: AccountContext
    private let openShare: (() -> Void)?
    private var presentationData: PresentationData
    
    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 actionsSeparatorNode: ASDisplayNode
    private let actionsBackgroundNode: ASDisplayNode
    private let installActionButtonNode: HighlightTrackingButtonNode
    private var installActionButtonIsRemove = false
    private let shareActionButtonNode: HighlightTrackingButtonNode
    private let contentTitleNode: ImmediateTextNode
    private let contentSeparatorNode: ASDisplayNode
    
    private var activityIndicator: ActivityIndicator?
    
    private var interaction: StickerPackPreviewInteraction!
    
    var presentInGlobalOverlay: ((ViewController, Any?) -> Void)?
    var dismiss: (() -> Void)?
    var cancel: (() -> Void)?
    var sendSticker: ((FileMediaReference, ASDisplayNode, CGRect) -> Bool)?
    
    let ready = Promise<Bool>()
    private var didSetReady = false
    
    private var stickerPack: LoadedStickerPack?
    private var stickerPackUpdated = false
    private var stickerPackInitiallyInstalled : Bool?
    private var stickerSettings: StickerSettings?
    
    private var currentItems: [StickerPackPreviewGridEntry] = []
    
    private var hapticFeedback: HapticFeedback?
    
    init(controller: StickerPackPreviewController, context: AccountContext, openShare: (() -> Void)?, openMention: @escaping (String) -> Void) {
        self.controller = controller
        self.context = context
        self.openShare = openShare
        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.installActionButtonNode = HighlightTrackingButtonNode()
        self.installActionButtonNode.displaysAsynchronously = false
        self.installActionButtonNode.titleNode.displaysAsynchronously = false
        
        self.shareActionButtonNode = HighlightTrackingButtonNode()
        self.shareActionButtonNode.displaysAsynchronously = false
        self.shareActionButtonNode.titleNode.displaysAsynchronously = false
        
        self.contentTitleNode = ImmediateTextNode()
        self.contentTitleNode.displaysAsynchronously = false
        self.contentTitleNode.maximumNumberOfLines = 1
        
        self.contentSeparatorNode = ASDisplayNode()
        self.contentSeparatorNode.isLayerBacked = true
        
        self.actionsSeparatorNode = ASDisplayNode()
        self.actionsSeparatorNode.isLayerBacked = true
        self.actionsBackgroundNode = ASDisplayNode()
        
        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.installActionButtonNode.addTarget(self, action: #selector(self.installActionButtonPressed), forControlEvents: .touchUpInside)
        self.installActionButtonNode.highligthedChanged = { [weak self] highlighted in
            if let strongSelf = self {
                if highlighted {
                    strongSelf.installActionButtonNode.layer.removeAnimation(forKey: "opacity")
                    strongSelf.installActionButtonNode.alpha = 0.8
                } else {
                    strongSelf.installActionButtonNode.alpha = 1.0
                    strongSelf.installActionButtonNode.layer.animateAlpha(from: 0.8, to: 1.0, duration: 0.3)
                }
            }
        }
        
        self.shareActionButtonNode.addTarget(self, action: #selector(self.sharePressed), forControlEvents: .touchUpInside)
        self.shareActionButtonNode.highligthedChanged = { [weak self] highlighted in
            if let strongSelf = self {
                if highlighted {
                    strongSelf.shareActionButtonNode.layer.removeAnimation(forKey: "opacity")
                    strongSelf.shareActionButtonNode.alpha = 0.8
                } else {
                    strongSelf.shareActionButtonNode.alpha = 1.0
                    strongSelf.shareActionButtonNode.layer.animateAlpha(from: 0.8, to: 1.0, duration: 0.3)
                }
            }
        }
        
        self.wrappingScrollNode.clipsToBounds = false
        self.wrappingScrollNode.addSubnode(self.contentBackgroundNode)
        
        self.wrappingScrollNode.addSubnode(self.contentContainerNode)
        self.contentContainerNode.addSubnode(self.contentGridNode)
        
        self.wrappingScrollNode.addSubnode(self.actionsBackgroundNode)
        self.wrappingScrollNode.addSubnode(self.actionsSeparatorNode)
        self.wrappingScrollNode.addSubnode(self.installActionButtonNode)
        self.wrappingScrollNode.addSubnode(self.shareActionButtonNode)
        
        self.wrappingScrollNode.addSubnode(self.contentTitleNode)
        self.wrappingScrollNode.addSubnode(self.contentSeparatorNode)
        
        self.wrappingScrollNode.addSubnode(self.cancelButtonNode)
        self.cancelButtonNode.addTarget(self, action: #selector(self.cancelButtonPressed), forControlEvents: .touchUpInside)
        
        self.contentGridNode.presentationLayoutUpdated = { [weak self] presentationLayout, transition in
            self?.gridPresentationLayoutUpdated(presentationLayout, transition: transition)
        }
        
        self.contentTitleNode.highlightAttributeAction = { attributes in
            if let _ = attributes[NSAttributedString.Key(rawValue: TelegramTextAttributes.PeerTextMention)] {
                return NSAttributedString.Key(rawValue: TelegramTextAttributes.PeerTextMention)
            } else {
                return nil
            }
        }
        
        self.contentTitleNode.tapAttributeAction = { attributes in
            if let mention = attributes[NSAttributedString.Key(rawValue: TelegramTextAttributes.PeerTextMention)] as? String, mention.count > 1 {
                openMention(String(mention[mention.index(after:  mention.startIndex)...]))
            }
        }
    }
    
    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<(ASDisplayNode, PeekControllerContent)?, NoError>? in
            if let strongSelf = self {
                if let itemNode = strongSelf.contentGridNode.itemNodeAtPoint(point) as? StickerPackPreviewGridItemNode, let item = itemNode.stickerPackItem {
                    return strongSelf.context.account.postbox.transaction { transaction -> Bool in
                        return getIsStickerSaved(transaction: transaction, fileId: item.file.fileId)
                    }
                    |> deliverOnMainQueue
                    |> map { isStarred -> (ASDisplayNode, PeekControllerContent)? in
                        if let strongSelf = self {
                            var menuItems: [PeekControllerMenuItem] = []
                            if let stickerPack = strongSelf.stickerPack, case let .result(info, _, _) = stickerPack, info.id.namespace == Namespaces.ItemCollection.CloudStickerPacks {
                                if strongSelf.sendSticker != nil {
                                    menuItems.append(PeekControllerMenuItem(title: strongSelf.presentationData.strings.ShareMenu_Send, color: .accent, font: .bold, action: { node, rect in
                                        if let strongSelf = self {
                                            return strongSelf.sendSticker?(.standalone(media: item.file), node, rect) ?? false
                                        } else {
                                            return false
                                        }
                                    }))
                                }
                                menuItems.append(PeekControllerMenuItem(title: isStarred ? strongSelf.presentationData.strings.Stickers_RemoveFromFavorites : strongSelf.presentationData.strings.Stickers_AddToFavorites, color: isStarred ? .destructive : .accent, action: { _, _ in
                                        if let strongSelf = self {
                                            if isStarred {
                                                let _ = removeSavedSticker(postbox: strongSelf.context.account.postbox, mediaId: item.file.fileId).start()
                                            } else {
                                                let _ = addSavedSticker(postbox: strongSelf.context.account.postbox, network: strongSelf.context.account.network, file: item.file).start()
                                            }
                                        }
                                    return true
                                }))
                                menuItems.append(PeekControllerMenuItem(title: strongSelf.presentationData.strings.Common_Cancel, color: .accent, font: .bold, action: { _, _ in return true }))
                            }
                            return (itemNode, StickerPreviewPeekContent(account: strongSelf.context.account, item: .pack(item), menu: menuItems))
                        } else {
                            return nil
                        }
                    }
                }
            }
            return nil
        }, present: { [weak self] content, sourceNode in
            if let strongSelf = self {
                let controller = PeekController(theme: PeekControllerTheme(presentationTheme: strongSelf.presentationData.theme), content: content, sourceNode: {
                    return sourceNode
                })
                strongSelf.presentInGlobalOverlay?(controller, nil)
                return controller
            }
            return nil
        }, updateContent: { [weak self] content in
            if let strongSelf = self {
                var item: StickerPreviewPeekItem?
                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: 1, topCapHeight: 1)
        
        let roundedBackground = generateStretchableFilledCircleImage(radius: 10.0, color: presentationData.theme.actionSheet.opaqueItemBackgroundColor)
        
        self.contentBackgroundNode.image = roundedBackground
        
        if !self.installActionButtonIsRemove {
            let roundedAccentBackground = generateImage(CGSize(width: 50.0, height: 50.0), rotatedContext: { size, context in
                context.clear(CGRect(origin: CGPoint(), size: size))
                context.setFillColor(self.presentationData.theme.list.itemCheckColors.fillColor.cgColor)
                context.fillEllipse(in: CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
            })?.stretchableImage(withLeftCapWidth: 25, topCapHeight: 25)
            self.installActionButtonNode.setBackgroundImage(roundedAccentBackground, for: [])
        }
        
        self.shareActionButtonNode.setTitle(presentationData.strings.Conversation_ContextMenuShare.uppercased(), with: Font.semibold(17.0), with: presentationData.theme.actionSheet.controlAccentColor, for: .normal)
        
        self.contentSeparatorNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemSeparatorColor
        self.actionsSeparatorNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemSeparatorColor
        self.actionsBackgroundNode.backgroundColor = presentationData.theme.actionSheet.opaqueItemBackgroundColor
        
        self.cancelButtonNode.setTitle(presentationData.strings.Common_Cancel.uppercased(), with: Font.semibold(17.0), 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)
        }
    }
    
    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 = 10.0 + insets.top
        let cleanInsets = layout.insets(options: [.statusBar])
        let hasShareButton = self.shareActionButtonNode.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 -= 0.0
        }
        
        let buttonHeight: CGFloat = 50.0
        let actionAreaTopInset: CGFloat = 15.0
        let buttonSpacing: CGFloat = 10.0
        let sectionSpacing: CGFloat = 8.0
        let titleAreaHeight: CGFloat = 54.0
        
        let width = horizontalContainerFillingSizeForLayout(layout: layout, sideInset: 0.0)
        
        let sideInset: CGFloat = 0.0
        
        //transition.updateFrame(node: self.cancelButtonNode, frame: CGRect(origin: CGPoint(x: sideInset, y: layout.size.height - bottomInset - buttonHeight), size: CGSize(width: width, height: buttonHeight)))
        
        var actionAreaHeight = bottomInset + buttonHeight + actionAreaTopInset
        
        transition.updateFrame(node: self.actionsBackgroundNode, frame: CGRect(origin: CGPoint(x: 0.0, y: layout.size.height - actionAreaHeight), size: CGSize(width: layout.size.width, height: actionAreaHeight)))
        transition.updateFrame(node: self.actionsSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: layout.size.height - actionAreaHeight), size: CGSize(width: layout.size.width, height: UIScreenPixel)))
        
        let maximumContentHeight = layout.size.height - insets.top
        
        let contentContainerFrame = CGRect(origin: CGPoint(x: sideInset, y: insets.top), size: CGSize(width: width, height: maximumContentHeight))
        let contentFrame = contentContainerFrame.insetBy(dx: 0.0, dy: 0.0)
        
        var transaction: StickerPackPreviewGridTransaction?
        
        var itemCount = 0
        var animateIn = false
        
        if let stickerPack = self.stickerPack {
            switch stickerPack {
                case .fetching, .none:
                    if self.activityIndicator == nil {
                        let activityIndicator = ActivityIndicator(type: ActivityIndicatorType.custom(self.presentationData.theme.actionSheet.controlAccentColor, 22.0, 2.0, false))
                        self.activityIndicator = activityIndicator
                        self.addSubnode(activityIndicator)
                    }
                case let .result(info, items, _):
                    if let activityIndicator = self.activityIndicator {
                        activityIndicator.removeFromSupernode()
                        self.activityIndicator = nil
                    }
                    itemCount = items.count
                    
                    var updatedItems: [StickerPackPreviewGridEntry] = []
                    for item in items {
                        if let item = item as? StickerPackItem {
                            updatedItems.append(StickerPackPreviewGridEntry(index: updatedItems.count, stickerItem: item))
                        }
                    }
                    
                    if self.currentItems.isEmpty && !updatedItems.isEmpty {
                        let entities = generateTextEntities(info.title, enabledTypes: [.mention])
                        let font = Font.semibold(17.0)
                        self.contentTitleNode.attributedText = stringWithAppliedEntities(info.title, entities: entities, baseColor: self.presentationData.theme.actionSheet.primaryTextColor, linkColor: self.presentationData.theme.actionSheet.controlAccentColor, baseFont: font, linkFont: font, boldFont: font, italicFont: font, boldItalicFont: font, fixedFont: font, blockQuoteFont: font)
                        animateIn = true
                    }
                    transaction = StickerPackPreviewGridTransaction(previousList: self.currentItems, list: updatedItems, account: self.context.account, interaction: self.interaction)
                    self.currentItems = updatedItems
            }
        }
        
        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 + floor((titleAreaHeight - titleSize.height) / 2.0)), 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 itemsPerRow = 4
        let itemWidth = floor(contentFrame.size.width / CGFloat(itemsPerRow))
        let rowCount = itemCount / itemsPerRow + (itemCount % itemsPerRow != 0 ? 1 : 0)
        
        let minimallyRevealedRowCount: CGFloat = 4.5
        let initiallyRevealedRowCount = min(minimallyRevealedRowCount, CGFloat(rowCount))
        
        let topInset = max(0.0, contentFrame.size.height - initiallyRevealedRowCount * itemWidth - titleAreaHeight - actionAreaHeight)
        
        transition.updateFrame(node: self.contentContainerNode, frame: contentContainerFrame)
        
        if let activityIndicator = self.activityIndicator {
            let indicatorSize = activityIndicator.calculateSizeThatFits(layout.size)
            
            transition.updateFrame(node: activityIndicator, frame: CGRect(origin: CGPoint(x: contentFrame.minX + floor((contentFrame.width - indicatorSize.width) / 2.0), y: contentFrame.maxY - indicatorSize.height - 54.0), size: indicatorSize))
        }
        
        var actionsOffset: CGFloat = layout.size.height - bottomInset
        transition.updateFrame(node: self.installActionButtonNode, frame: CGRect(origin: CGPoint(x: 16.0, y: actionsOffset - buttonHeight), size: CGSize(width: contentContainerFrame.size.width - 16.0 * 2.0, height: buttonHeight)))
        actionsOffset -= buttonHeight
        
        //transition.updateFrame(node: self.installActionSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - installButtonOffset - UIScreenPixel - bottomAreaHeight), size: CGSize(width: contentContainerFrame.size.width, height: UIScreenPixel)))
        
        //transition.updateFrame(node: self.shareActionButtonNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - buttonHeight - bottomAreaHeight), size: CGSize(width: contentContainerFrame.size.width, height: buttonHeight)))
        
        //transition.updateFrame(node: self.shareActionSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: contentContainerFrame.size.height - buttonHeight - UIScreenPixel - bottomAreaHeight), size: CGSize(width: contentContainerFrame.size.width, height: UIScreenPixel)))
        
        let gridSize = CGSize(width: contentFrame.size.width, height: max(32.0, contentFrame.size.height - titleAreaHeight - actionAreaHeight))
        
        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: 0.0, 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))
        
        if animateIn {
            self.contentGridNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
            self.installActionButtonNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
            self.shareActionButtonNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
            self.actionsSeparatorNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
            self.actionsBackgroundNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
        }
        
        if let _ = self.stickerPack, self.stickerPackUpdated {
            self.dequeueUpdateStickerPack()
        }
    }
    
    private func gridPresentationLayoutUpdated(_ presentationLayout: GridNodeCurrentPresentationLayout, transition: ContainedViewLayoutTransition) {
        if let (layout, _) = self.containerLayout {
            var insets = layout.insets(options: [.statusBar])
            insets.top = 10.0 + insets.top
            let cleanInsets = layout.insets(options: [.statusBar])
            
            var bottomInset: CGFloat = 10.0 + cleanInsets.bottom
            if insets.bottom > 0 {
                bottomInset -= 0.0
            }
            
            let buttonHeight: CGFloat = 50.0
            let actionAreaTopInset: CGFloat = 15.0
            let buttonSpacing: CGFloat = 10.0
            let sectionSpacing: CGFloat = 8.0
            let titleAreaHeight: CGFloat = 54.0
            
            let width = horizontalContainerFillingSizeForLayout(layout: layout, sideInset: 0.0)
            
            let sideInset: CGFloat = 0.0
            
            var actionAreaHeight = bottomInset + buttonHeight + actionAreaTopInset
            
            let maximumContentHeight = layout.size.height - insets.top
            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: CGSize(width: contentFrame.size.width, height: contentFrame.size.height + 500.0))
            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
            }
            var compactFrame = true
            if let stickerPack = self.stickerPack, case .result = stickerPack {
                compactFrame = false
            }
            if compactFrame {
                backgroundFrame = CGRect(origin: CGPoint(x: contentFrame.minX, y: contentFrame.maxY - buttonHeight - 64.0), size: CGSize(width: contentFrame.size.width, height: buttonHeight + 64.0))
            }
            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 + floor((titleAreaHeight - titleSize.height) / 2.0)), 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)))
            
            var modalStyleOverlayTransitionFactor: CGFloat = 0.0
            if !compactFrame && presentationLayout.contentOffset.y >= 0.0 {
                self.contentSeparatorNode.alpha = 1.0
            } else {
                self.contentSeparatorNode.alpha = 0.0
            }
            let activationDistance: CGFloat = 100.0
            let offsetFactor = (activationDistance - min(max(0.0, -presentationLayout.contentOffset.y), activationDistance)) / activationDistance
            
            self.controller?.updateModalStyleOverlayTransitionFactor(offsetFactor, transition: transition)
            //self.controller?.updateModalStyleOverlayTransitionFactor(offsetFactor.isZero ? 0.0 : 1.0, transition: .animated(duration: 0.4, curve: .spring))
        }
    }
    
    @objc func dimTapGesture(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state {
            self.cancelButtonPressed()
        }
    }
    
    @objc func cancelButtonPressed() {
        self.cancel?()
    }
    
    @objc func installActionButtonPressed() {
        let dismissOnAction: Bool
        if let initiallyInstalled = self.stickerPackInitiallyInstalled, initiallyInstalled {
            dismissOnAction = true
        } else {
            dismissOnAction = true
        }
        if let stickerPack = self.stickerPack, let stickerSettings = self.stickerSettings {
            switch stickerPack {
                case let .result(info, items, installed):
                    if installed {
                        let _ = removeStickerPackInteractively(postbox: self.context.account.postbox, id: info.id, option: .delete).start()
                        self.updateStickerPack(.result(info: info, items: items, installed: false), stickerSettings: stickerSettings)
                    } else {
                        let _ = addStickerPackInteractively(postbox: self.context.account.postbox, info: info, items: items).start()
                        if !dismissOnAction {
                            self.updateStickerPack(.result(info: info, items: items, installed: true), stickerSettings: stickerSettings)
                        }
                    }
                    if dismissOnAction {
                        self.cancelButtonPressed()
                    }
                default:
                    break
            }
        }
    }
    
    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: LoadedStickerPack, stickerSettings: StickerSettings) {
        self.stickerPack = stickerPack
        self.stickerSettings = stickerSettings
        self.stickerPackUpdated = true
        
        self.interaction.playAnimatedStickers = stickerSettings.loopAnimatedStickers
        
        if let _ = self.containerLayout {
            self.dequeueUpdateStickerPack()
        }
        
        switch stickerPack {
            case .none, .fetching:
                self.actionsSeparatorNode.alpha = 0.0
                self.shareActionButtonNode.alpha = 0.0
                self.actionsBackgroundNode.alpha = 0.0
                self.installActionButtonNode.alpha = 0.0
                self.installActionButtonNode.setTitle("", with: Font.semibold(17.0), with: self.presentationData.theme.list.itemCheckColors.foregroundColor, for: .normal)
                self.installActionButtonIsRemove = true
                self.installActionButtonNode.setBackgroundImage(nil, for: [])
            case let .result(info, _, installed):
                if self.stickerPackInitiallyInstalled == nil {
                    self.stickerPackInitiallyInstalled = installed
                }
                self.actionsSeparatorNode.alpha = 1.0
                self.actionsBackgroundNode.alpha = 1.0
                self.shareActionButtonNode.alpha = 1.0
                self.installActionButtonNode.alpha = 1.0
                if installed {
                    let text: String
                    if info.id.namespace == Namespaces.ItemCollection.CloudStickerPacks {
                        text = self.presentationData.strings.StickerPack_RemoveStickerCount(info.count)
                    } else {
                        text = self.presentationData.strings.StickerPack_RemoveMaskCount(info.count)
                    }
                    self.installActionButtonNode.setTitle(text.uppercased(), with: Font.semibold(17.0), with: self.presentationData.theme.list.itemDestructiveColor, for: .normal)
                    self.installActionButtonIsRemove = true
                    self.installActionButtonNode.setBackgroundImage(nil, for: [])
                } else {
                    let text: String
                    if info.id.namespace == Namespaces.ItemCollection.CloudStickerPacks {
                        text = self.presentationData.strings.StickerPack_AddStickerCount(info.count)
                    } else {
                        text = self.presentationData.strings.StickerPack_AddMaskCount(info.count)
                    }
                    self.installActionButtonNode.setTitle(text.uppercased(), with: Font.semibold(17.0), with: self.presentationData.theme.list.itemCheckColors.foregroundColor, for: .normal)
                    self.installActionButtonIsRemove = false
                    let roundedAccentBackground = generateImage(CGSize(width: 50.0, height: 50.0), rotatedContext: { size, context in
                        context.clear(CGRect(origin: CGPoint(), size: size))
                        context.setFillColor(self.presentationData.theme.list.itemCheckColors.fillColor.cgColor)
                        context.fillEllipse(in: CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: size.height)))
                    })?.stretchableImage(withLeftCapWidth: 25, topCapHeight: 25)
                    self.installActionButtonNode.setBackgroundImage(roundedAccentBackground, for: [])
                }
        }
    }
    
    func dequeueUpdateStickerPack() {
        if let (layout, navigationBarHeight) = self.containerLayout, let _ = self.stickerPack, self.stickerPackUpdated {
            self.stickerPackUpdated = false
            
            let transition: ContainedViewLayoutTransition
            if self.didSetReady {
                transition = .animated(duration: 0.4, curve: .spring)
            } else {
                transition = .immediate
            }
            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.installActionButtonNode.hitTest(self.installActionButtonNode.convert(point, from: self), with: event) {
            return result
        }
        else if self.shareActionButtonNode.supernode != nil, let result = self.shareActionButtonNode.hitTest(self.shareActionButtonNode.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
            }
        }
        
        let result = super.hitTest(point, with: event)
        
        var currentParent: UIView? = result
        var enableScrolling = true
        while true {
            if currentParent == nil {
                break
            }
            if let scrollView = currentParent as? UIScrollView {
                if scrollView === self.wrappingScrollNode.view {
                    break
                }
                if scrollView.disablesInteractiveModalDismiss {
                    enableScrolling = false
                    break
                } else {
                    if scrollView.isDecelerating && scrollView.contentOffset.y < -scrollView.contentInset.top {
                        return self.wrappingScrollNode.view
                    }
                }
            }
            currentParent = currentParent?.superview
        }
        
        return result
    }
    
    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: StickerPreviewPeekItem?, 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)
                }
            }
        }
    }
    
    @objc private func sharePressed() {
        self.openShare?()
    }
}