Swiftgram/submodules/TelegramUI/Components/Chat/ChatContextResultPeekContent/Sources/ChatContextResultPeekContent.swift

import Foundation
import UIKit
import Display
import AsyncDisplayKit
import Postbox
import TelegramCore
import SwiftSignalKit
import AVFoundation
import PhotoResources
import AppBundle
import ContextUI
import SoftwareVideo
import MultiplexedVideoNode

public final class ChatContextResultPeekContent: PeekControllerContent {
    public let account: Account
    public let contextResult: ChatContextResult
    public let menu: [ContextMenuItem]
    
    public init(account: Account, contextResult: ChatContextResult, menu: [ContextMenuItem]) {
        self.account = account
        self.contextResult = contextResult
        self.menu = menu
    }
    
    public func presentation() -> PeekControllerContentPresentation {
        return .contained
    }
    
    public func menuActivation() -> PeerControllerMenuActivation {
        return .drag
    }
    
    public func menuItems() -> [ContextMenuItem] {
        return self.menu
    }
    
    public func node() -> PeekControllerContentNode & ASDisplayNode {
        return ChatContextResultPeekNode(account: self.account, contextResult: self.contextResult)
    }
    
    public func topAccessoryNode() -> ASDisplayNode? {
        let arrowNode = ASImageNode()
        if let image = UIImage(bundleImageName: "Peek/Arrow") {
            arrowNode.image = image
            arrowNode.frame = CGRect(origin: CGPoint(), size: image.size)
        }
        return arrowNode
    }
    
    public func fullScreenAccessoryNode(blurView: UIVisualEffectView) -> (PeekControllerAccessoryNode & ASDisplayNode)? {
        return nil
    }
    
    public func isEqual(to: PeekControllerContent) -> Bool {
        if let to = to as? ChatContextResultPeekContent {
            return self.contextResult == to.contextResult
        } else {
            return false
        }
    }
}

private final class ChatContextResultPeekNode: ASDisplayNode, PeekControllerContentNode {
    private let account: Account
    private let contextResult: ChatContextResult
    
    private let imageNodeBackground: ASDisplayNode
    private let imageNode: TransformImageNode
    private var videoLayer: (SoftwareVideoThumbnailNode, SoftwareVideoLayerFrameManager, SampleBufferLayer)?
    
    private var currentImageResource: TelegramMediaResource?
    private var currentVideoFile: TelegramMediaFile?
    
    private let timebase: CMTimebase
    
    private var displayLink: CADisplayLink?
    private var ticking: Bool = false {
        didSet {
            if self.ticking != oldValue {
                if self.ticking {
                    class DisplayLinkProxy: NSObject {
                        weak var target: ChatContextResultPeekNode?
                        init(target: ChatContextResultPeekNode) {
                            self.target = target
                        }
                        
                        @objc func displayLinkEvent() {
                            self.target?.displayLinkEvent()
                        }
                    }
                    
                    let displayLink = CADisplayLink(target: DisplayLinkProxy(target: self), selector: #selector(DisplayLinkProxy.displayLinkEvent))
                    self.displayLink = displayLink
                    displayLink.add(to: RunLoop.main, forMode: .common)
                    if #available(iOS 10.0, *) {
                        displayLink.preferredFramesPerSecond = 25
                    } else {
                        displayLink.frameInterval = 2
                    }
                    displayLink.isPaused = false
                    CMTimebaseSetRate(self.timebase, rate: 1.0)
                } else if let displayLink = self.displayLink {
                    self.displayLink = nil
                    displayLink.isPaused = true
                    displayLink.invalidate()
                    CMTimebaseSetRate(self.timebase, rate: 0.0)
                }
            }
        }
    }
    
    private func displayLinkEvent() {
        let timestamp = CMTimebaseGetTime(self.timebase).seconds
        self.videoLayer?.1.tick(timestamp: timestamp)
    }
    
    init(account: Account, contextResult: ChatContextResult) {
        self.account = account
        self.contextResult = contextResult
        
        self.imageNodeBackground = ASDisplayNode()
        self.imageNodeBackground.isLayerBacked = true
        self.imageNodeBackground.backgroundColor = UIColor(white: 0.9, alpha: 1.0)
        
        self.imageNode = TransformImageNode()
        self.imageNode.contentAnimations = [.subsequentUpdates]
        self.imageNode.isLayerBacked = !smartInvertColorsEnabled()
        self.imageNode.displaysAsynchronously = false
        
        var timebase: CMTimebase?
        CMTimebaseCreateWithSourceClock(allocator: nil, sourceClock: CMClockGetHostTimeClock(), timebaseOut: &timebase)
        CMTimebaseSetRate(timebase!, rate: 0.0)
        self.timebase = timebase!
        
        super.init()
        
        self.addSubnode(self.imageNodeBackground)
        
        self.imageNode.contentAnimations = [.firstUpdate, .subsequentUpdates]
        self.addSubnode(self.imageNode)
    }
    
    deinit {
        if let displayLink = self.displayLink {
            displayLink.isPaused = true
            displayLink.invalidate()
        }
    }
    
    func ready() -> Signal<Bool, NoError> {
        return .single(true)
    }
    
    func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) -> CGSize {
        let imageLayout = self.imageNode.asyncLayout()
        let currentImageResource = self.currentImageResource
        let currentVideoFile = self.currentVideoFile
        
        var updateImageSignal: Signal<(TransformImageArguments) -> DrawingContext?, NoError>?
        
        var imageResource: TelegramMediaResource?
        var videoFileReference: FileMediaReference?
        var imageDimensions: CGSize?
        switch self.contextResult {
            case let .externalReference(externalReference):
                if let content = externalReference.content {
                    imageResource = content.resource
                } else if let thumbnail = externalReference.thumbnail {
                    imageResource = thumbnail.resource
                }
                imageDimensions = externalReference.content?.dimensions?.cgSize
                if let content = externalReference.content, externalReference.type == "gif", let thumbnailResource = imageResource
                    , let dimensions = content.dimensions {
                    videoFileReference = .standalone(media: TelegramMediaFile(fileId: MediaId(namespace: Namespaces.Media.LocalFile, id: 0), partialReference: nil, resource: content.resource, previewRepresentations: [TelegramMediaImageRepresentation(dimensions: dimensions, resource: thumbnailResource, progressiveSizes: [], immediateThumbnailData: nil, hasVideo: false, isPersonal: false)], videoThumbnails: [], immediateThumbnailData: nil, mimeType: "video/mp4", size: nil, attributes: [.Animated, .Video(duration: 0, size: dimensions, flags: [], preloadSize: nil)]))
                    imageResource = nil
                }
            case let .internalReference(internalReference):
                if let image = internalReference.image {
                    if let largestRepresentation = largestImageRepresentation(image.representations) {
                        imageDimensions = largestRepresentation.dimensions.cgSize
                    }
                    imageResource = imageRepresentationLargerThan(image.representations, size: PixelDimensions(width: 200, height: 100))?.resource
                } else if let file = internalReference.file {
                    if let dimensions = file.dimensions {
                        imageDimensions = dimensions.cgSize
                    } else if let largestRepresentation = largestImageRepresentation(file.previewRepresentations) {
                        imageDimensions = largestRepresentation.dimensions.cgSize
                    }
                    imageResource = smallestImageRepresentation(file.previewRepresentations)?.resource
                }
                
                if let file = internalReference.file {
                    if file.isVideo && file.isAnimated {
                        videoFileReference = .standalone(media: file)
                        imageResource = nil
                    }
                }
        }
        
        let fittedImageDimensions: CGSize
        let croppedImageDimensions: CGSize
        if let imageDimensions = imageDimensions {
            fittedImageDimensions = imageDimensions.fitted(CGSize(width: size.width, height: size.height))
        } else {
            fittedImageDimensions = CGSize(width: min(size.width, size.height), height: min(size.width, size.height))
        }
        croppedImageDimensions = fittedImageDimensions
        
        var imageApply: (() -> Void)?
        if let _ = imageResource {
            let imageCorners = ImageCorners()
            let arguments = TransformImageArguments(corners: imageCorners, imageSize: fittedImageDimensions, boundingSize: croppedImageDimensions, intrinsicInsets: UIEdgeInsets())
            imageApply = imageLayout(arguments)
        }
        
        var updatedImageResource = false
        if let currentImageResource = currentImageResource, let imageResource = imageResource {
            if !currentImageResource.isEqual(to: imageResource) {
                updatedImageResource = true
            }
        } else if (currentImageResource != nil) != (imageResource != nil) {
            updatedImageResource = true
        }
        
        var updatedVideoFile = false
        if let currentVideoFile = currentVideoFile, let videoFileReference = videoFileReference {
            if !currentVideoFile.isEqual(to: videoFileReference.media) {
                updatedVideoFile = true
            }
        } else if (currentVideoFile != nil) != (videoFileReference != nil) {
            updatedVideoFile = true
        }
        
        if updatedImageResource {
            if let imageResource = imageResource {
                let tmpRepresentation = TelegramMediaImageRepresentation(dimensions: PixelDimensions(width: Int32(fittedImageDimensions.width * 2.0), height: Int32(fittedImageDimensions.height * 2.0)), resource: imageResource, progressiveSizes: [], immediateThumbnailData: nil, hasVideo: false, isPersonal: false)
                let tmpImage = TelegramMediaImage(imageId: MediaId(namespace: 0, id: 0), representations: [tmpRepresentation], immediateThumbnailData: nil, reference: nil, partialReference: nil, flags: [])
                updateImageSignal = chatMessagePhoto(postbox: self.account.postbox, userLocation: .other, photoReference: .standalone(media: tmpImage))
            } else {
                updateImageSignal = .complete()
            }
        }
        
        self.currentImageResource = imageResource
        self.currentVideoFile = videoFileReference?.media
        
        if let imageApply = imageApply {
            if let updateImageSignal = updateImageSignal {
                self.imageNode.setSignal(updateImageSignal)
            }
            
            self.imageNode.frame = CGRect(origin: CGPoint(), size: croppedImageDimensions)
            self.imageNodeBackground.frame = CGRect(origin: CGPoint(), size: croppedImageDimensions)
            imageApply()
        }
        
        if updatedVideoFile {
            if let (thumbnailLayer, _, layer) = self.videoLayer {
                self.videoLayer = nil
                thumbnailLayer.removeFromSupernode()
                layer.layer.removeFromSuperlayer()
            }
            
            if let videoFileReference = videoFileReference {
                let thumbnailLayer = SoftwareVideoThumbnailNode(account: self.account, fileReference: videoFileReference, synchronousLoad: false)
                self.addSubnode(thumbnailLayer)
                let layerHolder = takeSampleBufferLayer()
                layerHolder.layer.videoGravity = AVLayerVideoGravity.resizeAspectFill
                self.layer.addSublayer(layerHolder.layer)
                let manager = SoftwareVideoLayerFrameManager(account: self.account, userLocation: .other, userContentType: .other, fileReference: videoFileReference, layerHolder: layerHolder)
                self.videoLayer = (thumbnailLayer, manager, layerHolder)
                thumbnailLayer.ready = { [weak self, weak thumbnailLayer, weak manager] in
                    if let strongSelf = self, let thumbnailLayer = thumbnailLayer, let manager = manager {
                        if strongSelf.videoLayer?.0 === thumbnailLayer && strongSelf.videoLayer?.1 === manager {
                            manager.start()
                        }
                    }
                }
            }
        }
        
        if let (thumbnailLayer, _, layer) = self.videoLayer {
            thumbnailLayer.frame = CGRect(origin: CGPoint(), size: croppedImageDimensions)
            layer.layer.frame = CGRect(origin: CGPoint(), size: CGSize(width: croppedImageDimensions.width, height: croppedImageDimensions.height))
        }
        
        if !self.ticking {
            self.ticking = true
        }
    
        return croppedImageDimensions
    }
}