Swiftgram/submodules/GalleryUI/Sources/Items/ChatImageGalleryItem.swift

import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import Postbox
import TelegramCore
import SyncCore
import TelegramPresentationData
import AccountContext
import RadialStatusNode
import PhotoResources

enum ChatMediaGalleryThumbnail: Equatable {
    case image(ImageMediaReference)
    case video(FileMediaReference)
    
    static func ==(lhs: ChatMediaGalleryThumbnail, rhs: ChatMediaGalleryThumbnail) -> Bool {
        switch lhs {
            case let .image(lhsImage):
                if case let .image(rhsImage) = rhs, lhsImage.media.isEqual(to: rhsImage.media) {
                    return true
                } else {
                    return false
                }
            case let .video(lhsVideo):
                if case let .video(rhsVideo) = rhs, lhsVideo.media.isEqual(to: rhsVideo.media) {
                    return true
                } else {
                    return false
                }
        }
    }
}

final class ChatMediaGalleryThumbnailItem: GalleryThumbnailItem {
    private let account: Account
    private let thumbnail: ChatMediaGalleryThumbnail
    
    init?(account: Account, mediaReference: AnyMediaReference) {
        self.account = account
        if let imageReference = mediaReference.concrete(TelegramMediaImage.self) {
            self.thumbnail = .image(imageReference)
        } else if let fileReference = mediaReference.concrete(TelegramMediaFile.self), fileReference.media.isVideo {
            self.thumbnail = .video(fileReference)
        } else {
            return nil
        }
    }
    
    func isEqual(to: GalleryThumbnailItem) -> Bool {
        if let to = to as? ChatMediaGalleryThumbnailItem {
            return self.thumbnail == to.thumbnail
        } else {
            return false
        }
    }
    
    var image: (Signal<(TransformImageArguments) -> DrawingContext?, NoError>, CGSize) {
        switch self.thumbnail {
            case let .image(imageReference):
                if let representation = largestImageRepresentation(imageReference.media.representations) {
                    return (mediaGridMessagePhoto(account: self.account, photoReference: imageReference), representation.dimensions.cgSize)
                } else {
                    return (.single({ _ in return nil }), CGSize(width: 128.0, height: 128.0))
                }
            case let .video(fileReference):
                if let representation = largestImageRepresentation(fileReference.media.previewRepresentations) {
                    return (mediaGridMessageVideo(postbox: self.account.postbox, videoReference: fileReference), representation.dimensions.cgSize)
                } else {
                    return (.single({ _ in return nil }), CGSize(width: 128.0, height: 128.0))
                }
        }
    }
}

class ChatImageGalleryItem: GalleryItem {
    let context: AccountContext
    let presentationData: PresentationData
    let message: Message
    let location: MessageHistoryEntryLocation?
    let performAction: (GalleryControllerInteractionTapAction) -> Void
    let openActionOptions: (GalleryControllerInteractionTapAction) -> Void
    
    init(context: AccountContext, presentationData: PresentationData, message: Message, location: MessageHistoryEntryLocation?, performAction: @escaping (GalleryControllerInteractionTapAction) -> Void, openActionOptions: @escaping (GalleryControllerInteractionTapAction) -> Void) {
        self.context = context
        self.presentationData = presentationData
        self.message = message
        self.location = location
        self.performAction = performAction
        self.openActionOptions = openActionOptions
    }
    
    func node() -> GalleryItemNode {
        let node = ChatImageGalleryItemNode(context: self.context, presentationData: self.presentationData, performAction: self.performAction, openActionOptions: self.openActionOptions)
        
        for media in self.message.media {
            if let image = media as? TelegramMediaImage {
                node.setImage(imageReference: .message(message: MessageReference(self.message), media: image))
                break
            } else if let file = media as? TelegramMediaFile, file.mimeType.hasPrefix("image/") {
                node.setFile(context: self.context, fileReference: .message(message: MessageReference(self.message), media: file))
                break
            } else if let webpage = media as? TelegramMediaWebpage, case let .Loaded(content) = webpage.content {
                if let image = content.image {
                    node.setImage(imageReference: .message(message: MessageReference(self.message), media: image))
                    break
                } else if let file = content.file, file.mimeType.hasPrefix("image/") {
                    node.setFile(context: self.context, fileReference: .message(message: MessageReference(self.message), media: file))
                    break
                }
            }
        }
        
        if let location = self.location {
            node._title.set(.single(self.presentationData.strings.Items_NOfM("\(location.index + 1)", "\(location.count)").0))
        }
        
        node.setMessage(self.message)
        
        return node
    }
    
    func updateNode(node: GalleryItemNode) {
        if let node = node as? ChatImageGalleryItemNode, let location = self.location {
            node._title.set(.single(self.presentationData.strings.Items_NOfM("\(location.index + 1)", "\(location.count)").0))
            
            node.setMessage(self.message)
        }
    }
    
    func thumbnailItem() -> (Int64, GalleryThumbnailItem)? {
        if let id = self.message.groupInfo?.stableId {
            var mediaReference: AnyMediaReference?
            for m in self.message.media {
                if let m = m as? TelegramMediaImage {
                    mediaReference = .message(message: MessageReference(self.message), media: m)
                } else if let m = m as? TelegramMediaFile, m.isVideo {
                    mediaReference = .message(message: MessageReference(self.message), media: m)
                }
            }
            if let mediaReference = mediaReference {
                if let item = ChatMediaGalleryThumbnailItem(account: self.context.account, mediaReference: mediaReference) {
                    return (Int64(id), item)
                }
            }
        }
        return nil
    }
}

final class ChatImageGalleryItemNode: ZoomableContentGalleryItemNode {
    private let context: AccountContext
    private var message: Message?
    
    private let imageNode: TransformImageNode
    fileprivate let _ready = Promise<Void>()
    fileprivate let _title = Promise<String>()
    private let statusNodeContainer: HighlightableButtonNode
    private let statusNode: RadialStatusNode
    private let footerContentNode: ChatItemGalleryFooterContentNode
    
    private var contextAndMedia: (AccountContext, AnyMediaReference)?
    
    private var fetchDisposable = MetaDisposable()
    private let statusDisposable = MetaDisposable()
    private var status: MediaResourceStatus?
    
    init(context: AccountContext, presentationData: PresentationData, performAction: @escaping (GalleryControllerInteractionTapAction) -> Void, openActionOptions: @escaping (GalleryControllerInteractionTapAction) -> Void) {
        self.context = context
        
        self.imageNode = TransformImageNode()
        self.footerContentNode = ChatItemGalleryFooterContentNode(context: context, presentationData: presentationData)
        self.footerContentNode.performAction = performAction
        self.footerContentNode.openActionOptions = openActionOptions
        
        self.statusNodeContainer = HighlightableButtonNode()
        self.statusNode = RadialStatusNode(backgroundNodeColor: UIColor(white: 0.0, alpha: 0.5))
        self.statusNode.frame = CGRect(origin: CGPoint(), size: CGSize(width: 50.0, height: 50.0))
        self.statusNode.isHidden = true
        
        super.init()
        
        self.imageNode.imageUpdated = { [weak self] _ in
            self?._ready.set(.single(Void()))
        }
        
        self.imageNode.view.contentMode = .scaleAspectFill
        self.imageNode.clipsToBounds = true
        
        self.statusNodeContainer.addSubnode(self.statusNode)
        self.addSubnode(self.statusNodeContainer)
        
        self.statusNodeContainer.addTarget(self, action: #selector(self.statusPressed), forControlEvents: .touchUpInside)
        
        self.statusNodeContainer.isUserInteractionEnabled = false
    }
    
    deinit {
        //self.fetchDisposable.dispose()
        self.statusDisposable.dispose()
    }
    
    override func ready() -> Signal<Void, NoError> {
        return self._ready.get()
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        
        let statusSize = CGSize(width: 50.0, height: 50.0)
        transition.updateFrame(node: self.statusNodeContainer, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - statusSize.width) / 2.0), y: floor((layout.size.height - statusSize.height) / 2.0)), size: statusSize))
        transition.updateFrame(node: self.statusNode, frame: CGRect(origin: CGPoint(), size: statusSize))
    }
    
    fileprivate func setMessage(_ message: Message) {
        self.footerContentNode.setMessage(message)
    }
    
    fileprivate func setImage(imageReference: ImageMediaReference) {
        if self.contextAndMedia == nil || !self.contextAndMedia!.1.media.isEqual(to: imageReference.media) {
            if let largestSize = largestRepresentationForPhoto(imageReference.media) {
                let displaySize = largestSize.dimensions.cgSize.fitted(CGSize(width: 1280.0, height: 1280.0)).dividedByScreenScale().integralFloor
                self.imageNode.asyncLayout()(TransformImageArguments(corners: ImageCorners(), imageSize: displaySize, boundingSize: displaySize, intrinsicInsets: UIEdgeInsets()))()
                self.imageNode.setSignal(chatMessagePhoto(postbox: context.account.postbox, photoReference: imageReference), dispatchOnDisplayLink: false)
                self.zoomableContent = (largestSize.dimensions.cgSize, self.imageNode)
                
                self.fetchDisposable.set(fetchedMediaResource(mediaBox: self.context.account.postbox.mediaBox, reference: imageReference.resourceReference(largestSize.resource)).start())
                self.setupStatus(resource: largestSize.resource)
            } else {
                self._ready.set(.single(Void()))
            }
        }
        self.contextAndMedia = (self.context, imageReference.abstract)
    }
    
    func setFile(context: AccountContext, fileReference: FileMediaReference) {
        if self.contextAndMedia == nil || !self.contextAndMedia!.1.media.isEqual(to: fileReference.media) {
            if var largestSize = fileReference.media.dimensions {
                var displaySize = largestSize.cgSize.dividedByScreenScale()
                if let previewDimensions = largestImageRepresentation(fileReference.media.previewRepresentations)?.dimensions {
                    let previewAspect = CGFloat(previewDimensions.width) / CGFloat(previewDimensions.height)
                    let aspect = displaySize.width / displaySize.height
                    if abs(previewAspect - 1.0 / aspect) < 0.1 {
                        displaySize = CGSize(width: displaySize.height, height: displaySize.width)
                        largestSize = PixelDimensions(width: largestSize.height, height: largestSize.width)
                    }
                }
                self.imageNode.asyncLayout()(TransformImageArguments(corners: ImageCorners(), imageSize: displaySize, boundingSize: displaySize, intrinsicInsets: UIEdgeInsets()))()
                self.imageNode.setSignal(chatMessageImageFile(account: context.account, fileReference: fileReference, thumbnail: false), dispatchOnDisplayLink: false)
                self.zoomableContent = (largestSize.cgSize, self.imageNode)
                self.setupStatus(resource: fileReference.media.resource)
            } else {
                self._ready.set(.single(Void()))
            }
        }
        self.contextAndMedia = (context, fileReference.abstract)
    }
    
    private func setupStatus(resource: MediaResource) {
        self.statusDisposable.set((self.context.account.postbox.mediaBox.resourceStatus(resource)
        |> deliverOnMainQueue).start(next: { [weak self] status in
            if let strongSelf = self {
                let previousStatus = strongSelf.status
                strongSelf.status = status
                switch status {
                    case .Remote:
                        strongSelf.statusNode.isHidden = false
                        strongSelf.statusNode.alpha = 1.0
                        strongSelf.statusNodeContainer.isUserInteractionEnabled = true
                        strongSelf.statusNode.transitionToState(.download(.white), completion: {})
                    case let .Fetching(isActive, progress):
                        strongSelf.statusNode.isHidden = false
                        strongSelf.statusNode.alpha = 1.0
                        strongSelf.statusNodeContainer.isUserInteractionEnabled = true
                        let adjustedProgress = max(progress, 0.027)
                        strongSelf.statusNode.transitionToState(.progress(color: .white, lineWidth: nil, value: CGFloat(adjustedProgress), cancelEnabled: true), completion: {})
                    case .Local:
                        if let previousStatus = previousStatus, case .Fetching = previousStatus {
                            strongSelf.statusNode.transitionToState(.progress(color: .white, lineWidth: nil, value: 1.0, cancelEnabled: true), completion: {
                                if let strongSelf = self {
                                    strongSelf.statusNode.alpha = 0.0
                                    strongSelf.statusNodeContainer.isUserInteractionEnabled = false
                                    strongSelf.statusNode.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2, completion: { _ in
                                        if let strongSelf = self {
                                            strongSelf.statusNode.transitionToState(.none, animated: false, completion: {})
                                        }
                                    })
                                }
                            })
                        } else if !strongSelf.statusNode.isHidden && !strongSelf.statusNode.alpha.isZero {
                            strongSelf.statusNode.alpha = 0.0
                            strongSelf.statusNodeContainer.isUserInteractionEnabled = false
                            strongSelf.statusNode.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2, completion: { _ in
                                if let strongSelf = self {
                                    strongSelf.statusNode.transitionToState(.none, animated: false, completion: {})
                                }
                            })
                        }
                }
            }
        }))
    }
    
    override func animateIn(from node: (ASDisplayNode, () -> (UIView?, UIView?)), addToTransitionSurface: (UIView) -> Void) {
        var transformedFrame = node.0.view.convert(node.0.view.bounds, to: self.imageNode.view)
        let transformedSuperFrame = node.0.view.convert(node.0.view.bounds, to: self.imageNode.view.superview)
        let transformedSelfFrame = node.0.view.convert(node.0.view.bounds, to: self.view)
        let transformedCopyViewFinalFrame = self.imageNode.view.convert(self.imageNode.view.bounds, to: self.view)
        
        let (maybeSurfaceCopyView, _) = node.1()
        let (maybeCopyView, copyViewBackgrond) = node.1()
        copyViewBackgrond?.alpha = 0.0
        let surfaceCopyView = maybeSurfaceCopyView!
        let copyView = maybeCopyView!
        
        addToTransitionSurface(surfaceCopyView)
        
        var transformedSurfaceFrame: CGRect?
        var transformedSurfaceFinalFrame: CGRect?
        if let contentSurface = surfaceCopyView.superview {
            transformedSurfaceFrame = node.0.view.convert(node.0.view.bounds, to: contentSurface)
            transformedSurfaceFinalFrame = self.imageNode.view.convert(self.imageNode.view.bounds, to: contentSurface)
        }
        
        if let transformedSurfaceFrame = transformedSurfaceFrame {
            surfaceCopyView.frame = transformedSurfaceFrame
        }
        
        self.view.insertSubview(copyView, belowSubview: self.scrollNode.view)
        copyView.frame = transformedSelfFrame
        
        copyView.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2, removeOnCompletion: false)
        
        surfaceCopyView.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.25, removeOnCompletion: false)
        
        let positionDuration: Double = 0.21
        
        copyView.layer.animatePosition(from: CGPoint(x: transformedSelfFrame.midX, y: transformedSelfFrame.midY), to: CGPoint(x: transformedCopyViewFinalFrame.midX, y: transformedCopyViewFinalFrame.midY), duration: positionDuration, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { [weak copyView] _ in
            copyView?.removeFromSuperview()
        })
        let scale = CGSize(width: transformedCopyViewFinalFrame.size.width / transformedSelfFrame.size.width, height: transformedCopyViewFinalFrame.size.height / transformedSelfFrame.size.height)
        copyView.layer.animate(from: NSValue(caTransform3D: CATransform3DIdentity), to: NSValue(caTransform3D: CATransform3DMakeScale(scale.width, scale.height, 1.0)), keyPath: "transform", timingFunction: kCAMediaTimingFunctionSpring, duration: 0.25, removeOnCompletion: false)
        
        if let transformedSurfaceFrame = transformedSurfaceFrame, let transformedSurfaceFinalFrame = transformedSurfaceFinalFrame {
            surfaceCopyView.layer.animatePosition(from: CGPoint(x: transformedSurfaceFrame.midX, y: transformedSurfaceFrame.midY), to: CGPoint(x: transformedCopyViewFinalFrame.midX, y: transformedCopyViewFinalFrame.midY), duration: positionDuration, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { [weak surfaceCopyView] _ in
                surfaceCopyView?.removeFromSuperview()
            })
            let scale = CGSize(width: transformedSurfaceFinalFrame.size.width / transformedSurfaceFrame.size.width, height: transformedSurfaceFinalFrame.size.height / transformedSurfaceFrame.size.height)
            surfaceCopyView.layer.animate(from: NSValue(caTransform3D: CATransform3DIdentity), to: NSValue(caTransform3D: CATransform3DMakeScale(scale.width, scale.height, 1.0)), keyPath: "transform", timingFunction: kCAMediaTimingFunctionSpring, duration: 0.25, removeOnCompletion: false)
        }
        
        self.imageNode.layer.animatePosition(from: CGPoint(x: transformedSuperFrame.midX, y: transformedSuperFrame.midY), to: self.imageNode.layer.position, duration: positionDuration, timingFunction: kCAMediaTimingFunctionSpring)
        self.imageNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.1)
        
        transformedFrame.origin = CGPoint()
        self.imageNode.layer.animateBounds(from: transformedFrame, to: self.imageNode.layer.bounds, duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring)
        
        self.statusNodeContainer.layer.animatePosition(from: CGPoint(x: transformedSuperFrame.midX, y: transformedSuperFrame.midY), to: self.statusNodeContainer.position, duration: positionDuration, timingFunction: kCAMediaTimingFunctionSpring)
        self.statusNodeContainer.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring)
        self.statusNodeContainer.layer.animateScale(from: 0.5, to: 1.0, duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring)
    }
    
    override func animateOut(to node: (ASDisplayNode, () -> (UIView?, UIView?)), addToTransitionSurface: (UIView) -> Void, completion: @escaping () -> Void) {
        self.fetchDisposable.set(nil)
        
        var transformedFrame = node.0.view.convert(node.0.view.bounds, to: self.imageNode.view)
        let transformedSuperFrame = node.0.view.convert(node.0.view.bounds, to: self.imageNode.view.superview)
        let transformedSelfFrame = node.0.view.convert(node.0.view.bounds, to: self.view)
        let transformedCopyViewInitialFrame = self.imageNode.view.convert(self.imageNode.view.bounds, to: self.view)
        
        var positionCompleted = false
        var boundsCompleted = false
        var copyCompleted = false
        
        let (maybeSurfaceCopyView, _) = node.1()
        let (maybeCopyView, copyViewBackgrond) = node.1()
        copyViewBackgrond?.alpha = 0.0
        let surfaceCopyView = maybeSurfaceCopyView!
        let copyView = maybeCopyView!
        
        addToTransitionSurface(surfaceCopyView)
        
        var transformedSurfaceFrame: CGRect?
        var transformedSurfaceCopyViewInitialFrame: CGRect?
        if let contentSurface = surfaceCopyView.superview {
            transformedSurfaceFrame = node.0.view.convert(node.0.view.bounds, to: contentSurface)
            transformedSurfaceCopyViewInitialFrame = self.imageNode.view.convert(self.imageNode.view.bounds, to: contentSurface)
        }
        
        self.view.insertSubview(copyView, belowSubview: self.scrollNode.view)
        copyView.frame = transformedSelfFrame
        
        let intermediateCompletion = { [weak copyView, weak surfaceCopyView] in
            if positionCompleted && boundsCompleted && copyCompleted {
                copyView?.removeFromSuperview()
                surfaceCopyView?.removeFromSuperview()
                completion()
            }
        }
        
        copyView.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.08, removeOnCompletion: false)
        surfaceCopyView.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.025, removeOnCompletion: false)
        
        copyView.layer.animatePosition(from: CGPoint(x: transformedCopyViewInitialFrame.midX, y: transformedCopyViewInitialFrame.midY), to: CGPoint(x: transformedSelfFrame.midX, y: transformedSelfFrame.midY), duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false)
        let scale = CGSize(width: transformedCopyViewInitialFrame.size.width / transformedSelfFrame.size.width, height: transformedCopyViewInitialFrame.size.height / transformedSelfFrame.size.height)
        copyView.layer.animate(from: NSValue(caTransform3D: CATransform3DMakeScale(scale.width, scale.height, 1.0)), to: NSValue(caTransform3D: CATransform3DIdentity), keyPath: "transform", timingFunction: kCAMediaTimingFunctionSpring, duration: 0.25, removeOnCompletion: false, completion: { _ in
            copyCompleted = true
            intermediateCompletion()
        })
        
        if let transformedSurfaceFrame = transformedSurfaceFrame, let transformedCopyViewInitialFrame = transformedSurfaceCopyViewInitialFrame {
            surfaceCopyView.layer.animatePosition(from: CGPoint(x: transformedCopyViewInitialFrame.midX, y: transformedCopyViewInitialFrame.midY), to: CGPoint(x: transformedSurfaceFrame.midX, y: transformedSurfaceFrame.midY), duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false)
            let scale = CGSize(width: transformedCopyViewInitialFrame.size.width / transformedSurfaceFrame.size.width, height: transformedCopyViewInitialFrame.size.height / transformedSurfaceFrame.size.height)
            surfaceCopyView.layer.animate(from: NSValue(caTransform3D: CATransform3DMakeScale(scale.width, scale.height, 1.0)), to: NSValue(caTransform3D: CATransform3DIdentity), keyPath: "transform", timingFunction: kCAMediaTimingFunctionSpring, duration: 0.25, removeOnCompletion: false)
        }
        
        self.imageNode.layer.animatePosition(from: self.imageNode.layer.position, to: CGPoint(x: transformedSuperFrame.midX, y: transformedSuperFrame.midY), duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { _ in
            positionCompleted = true
            intermediateCompletion()
        })
        
        self.imageNode.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.08, removeOnCompletion: false)
        
        transformedFrame.origin = CGPoint()
        self.imageNode.layer.animateBounds(from: self.imageNode.layer.bounds, to: transformedFrame, duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { _ in
            boundsCompleted = true
            intermediateCompletion()
        })
        
        self.statusNodeContainer.layer.animatePosition(from: self.statusNodeContainer.position, to: CGPoint(x: transformedSuperFrame.midX, y: transformedSuperFrame.midY), duration: 0.25, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false)
        self.statusNodeContainer.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.15, timingFunction: CAMediaTimingFunctionName.easeIn.rawValue, removeOnCompletion: false)
    }
    
    override func visibilityUpdated(isVisible: Bool) {
        super.visibilityUpdated(isVisible: isVisible)
        
        if let (context, mediaReference) = self.contextAndMedia, let fileReference = mediaReference.concrete(TelegramMediaFile.self) {
            if isVisible {
            } else {
                self.fetchDisposable.set(nil)
            }
        }
    }
    
    override func title() -> Signal<String, NoError> {
        return self._title.get()
    }
    
    override func footerContent() -> Signal<GalleryFooterContentNode?, NoError> {
        return .single(self.footerContentNode)
    }
    
    @objc func statusPressed() {
        if let (_, mediaReference) = self.contextAndMedia, let status = self.status {
            var resource: MediaResourceReference?
            var statsCategory: MediaResourceStatsCategory?
            if let fileReference = mediaReference.concrete(TelegramMediaFile.self) {
                resource = fileReference.resourceReference(fileReference.media.resource)
                statsCategory = statsCategoryForFileWithAttributes(fileReference.media.attributes)
            } else if let imageReference = mediaReference.concrete(TelegramMediaImage.self ) {
                resource = (largestImageRepresentation(imageReference.media.representations)?.resource).flatMap(imageReference.resourceReference)
                statsCategory = .image
            }
            if let resource = resource {
                switch status {
                    case .Fetching:
                        self.context.account.postbox.mediaBox.cancelInteractiveResourceFetch(resource.resource)
                    case .Remote:
                        self.fetchDisposable.set(fetchedMediaResource(mediaBox: self.context.account.postbox.mediaBox, reference: resource, statsCategory: statsCategory ?? .generic).start())
                    default:
                        break
                }
            }
        }
    }
}