import Foundation
import UIKit
import AsyncDisplayKit
import TelegramCore
import Postbox
import SwiftSignalKit
import Display
import TelegramPresentationData
import TelegramUIPreferences
import ActivityIndicator
import AccountContext
import RadialStatusNode
import PhotoResources
import TelegramStringFormatting

final class EditAccessoryPanelNode: AccessoryPanelNode {
    let dateTimeFormat: PresentationDateTimeFormat
    let messageId: MessageId
    
    let closeButton: HighlightableButtonNode
    let lineNode: ASImageNode
    let iconNode: ASImageNode
    let titleNode: ImmediateTextNode
    let textNode: ImmediateTextNode
    let imageNode: TransformImageNode
    let dimNode: ASDisplayNode
    let drawIconNode: ASImageNode
    
    private let actionArea: AccessibilityAreaNode
    
    private let activityIndicator: ActivityIndicator
    private let statusNode: RadialStatusNode
    private let tapNode: ASDisplayNode
    
    private let messageDisposable = MetaDisposable()
    private let editingMessageDisposable = MetaDisposable()
    
    private var isPhoto = false
    private var currentMessage: Message?
    private var currentEditMediaReference: AnyMediaReference?
    private var previousMediaReference: AnyMediaReference?
    
    override var interfaceInteraction: ChatPanelInterfaceInteraction? {
        didSet {
            if let statuses = self.interfaceInteraction?.statuses {
                self.editingMessageDisposable.set(statuses.editingMessage.start(next: { [weak self] value in
                    if let strongSelf = self {
                        if let value = value {
                            if value.isZero {
                                strongSelf.activityIndicator.isHidden = false
                                strongSelf.statusNode.transitionToState(.none, completion: {})
                            } else {
                                strongSelf.activityIndicator.isHidden = true
                            strongSelf.statusNode.transitionToState(.progress(color: strongSelf.theme.chat.inputPanel.panelControlAccentColor, lineWidth: nil, value: CGFloat(value), cancelEnabled: false, animateRotation: true), completion: {})
                            }
                        } else {
                            strongSelf.activityIndicator.isHidden = true
                            strongSelf.statusNode.transitionToState(.none, completion: {})
                        }
                    }
                }))
            }
        }
    }
    
    private let context: AccountContext
    var theme: PresentationTheme
    var strings: PresentationStrings
    var nameDisplayOrder: PresentationPersonNameOrder
    
    private var validLayout: (size: CGSize, inset: CGFloat, interfaceState: ChatPresentationInterfaceState)?
    
    init(context: AccountContext, messageId: MessageId, theme: PresentationTheme, strings: PresentationStrings, nameDisplayOrder: PresentationPersonNameOrder, dateTimeFormat: PresentationDateTimeFormat) {
        self.context = context
        self.messageId = messageId
        self.theme = theme
        self.strings = strings
        self.nameDisplayOrder = nameDisplayOrder
        self.dateTimeFormat = dateTimeFormat
        
        self.closeButton = HighlightableButtonNode()
        self.closeButton.accessibilityLabel = strings.VoiceOver_DiscardPreparedContent
        self.closeButton.setImage(PresentationResourcesChat.chatInputPanelCloseIconImage(theme), for: [])
        self.closeButton.hitTestSlop = UIEdgeInsets(top: -8.0, left: -8.0, bottom: -8.0, right: -8.0)
        self.closeButton.displaysAsynchronously = false
        
        self.lineNode = ASImageNode()
        self.lineNode.displayWithoutProcessing = true
        self.lineNode.displaysAsynchronously = false
        self.lineNode.image = PresentationResourcesChat.chatInputPanelVerticalSeparatorLineImage(theme)
        
        self.iconNode = ASImageNode()
        self.iconNode.displayWithoutProcessing = false
        self.iconNode.displaysAsynchronously = false
        self.iconNode.image = PresentationResourcesChat.chatInputPanelEditIconImage(theme)
        
        self.titleNode = ImmediateTextNode()
        self.titleNode.maximumNumberOfLines = 1
        self.titleNode.displaysAsynchronously = false
        
        self.textNode = ImmediateTextNode()
        self.textNode.maximumNumberOfLines = 1
        self.textNode.displaysAsynchronously = false
        self.textNode.isUserInteractionEnabled = true
        
        self.imageNode = TransformImageNode()
        self.imageNode.contentAnimations = [.subsequentUpdates]
        self.imageNode.isHidden = true
        self.imageNode.isUserInteractionEnabled = true
        
        self.dimNode = ASDisplayNode()
        self.dimNode.backgroundColor = UIColor(rgb: 0x000000, alpha: 0.6)
        self.dimNode.cornerRadius = 2.0
        self.dimNode.isHidden = true
        
        self.drawIconNode = ASImageNode()
        self.drawIconNode.contentMode = .center
        self.drawIconNode.image = generateTintedImage(image: UIImage(bundleImageName: "Chat/Context Menu/Draw"), color: .white)
        self.drawIconNode.isHidden = true
        
        self.activityIndicator = ActivityIndicator(type: .custom(theme.chat.inputPanel.panelControlAccentColor, 22.0, 2.0, false))
        self.activityIndicator.isHidden = true
        
        self.statusNode = RadialStatusNode(backgroundNodeColor: .clear)
        
        self.tapNode = ASDisplayNode()
        
        self.actionArea = AccessibilityAreaNode()
        
        super.init()
        
        self.closeButton.addTarget(self, action: #selector(self.closePressed), forControlEvents: [.touchUpInside])
        self.addSubnode(self.closeButton)
        
        self.addSubnode(self.lineNode)
        self.addSubnode(self.iconNode)
        self.addSubnode(self.titleNode)
        self.addSubnode(self.textNode)
        self.addSubnode(self.imageNode)
        self.addSubnode(self.dimNode)
        self.addSubnode(self.drawIconNode)
        self.addSubnode(self.activityIndicator)
        self.addSubnode(self.statusNode)
        self.addSubnode(self.tapNode)
        self.addSubnode(self.actionArea)
        self.messageDisposable.set((context.account.postbox.messageAtId(messageId)
        |> deliverOnMainQueue).start(next: { [weak self] message in
            self?.updateMessage(message)
        }))
    }
    
    deinit {
        self.messageDisposable.dispose()
        self.editingMessageDisposable.dispose()
    }
    
    override func didLoad() {
        super.didLoad()
        
        self.tapNode.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.contentTap(_:))))
    }
    
    private func updateMessage(_ message: Message?) {
        self.currentMessage = message
        
        var text = ""
        if let message = message {
            var effectiveMessage = message
            if let currentEditMediaReference = self.currentEditMediaReference {
                effectiveMessage = effectiveMessage.withUpdatedMedia([currentEditMediaReference.media])
            }
            (text, _) = descriptionStringForMessage(contentSettings: context.currentContentSettings.with { $0 }, message: EngineMessage(effectiveMessage), strings: self.strings, nameDisplayOrder: self.nameDisplayOrder, dateTimeFormat: self.dateTimeFormat, accountPeerId: self.context.account.peerId)
        }
        
        var updatedMediaReference: AnyMediaReference?
        var imageDimensions: CGSize?
        if let message = message, !message.containsSecretMedia {
            var candidateMediaReference: AnyMediaReference?
            if let currentEditMedia = self.currentEditMediaReference {
                candidateMediaReference = currentEditMedia
            } else {
                for media in message.media {
                    if media is TelegramMediaImage || media is TelegramMediaFile {
                        candidateMediaReference = .message(message: MessageReference(message), media: media)
                        break
                    }
                }
            }
            
            if let imageReference = candidateMediaReference?.concrete(TelegramMediaImage.self) {
                updatedMediaReference = imageReference.abstract
                if let representation = largestRepresentationForPhoto(imageReference.media) {
                    imageDimensions = representation.dimensions.cgSize
                }
            } else if let fileReference = candidateMediaReference?.concrete(TelegramMediaFile.self) {
                updatedMediaReference = fileReference.abstract
                if !fileReference.media.isInstantVideo, let representation = largestImageRepresentation(fileReference.media.previewRepresentations), !fileReference.media.isSticker {
                    imageDimensions = representation.dimensions.cgSize
                }
            }
        }
        
        let imageNodeLayout = self.imageNode.asyncLayout()
        var applyImage: (() -> Void)?
        if let imageDimensions = imageDimensions {
            let boundingSize = CGSize(width: 35.0, height: 35.0)
            applyImage = imageNodeLayout(TransformImageArguments(corners: ImageCorners(radius: 2.0), imageSize: imageDimensions.aspectFilled(boundingSize), boundingSize: boundingSize, intrinsicInsets: UIEdgeInsets()))
        }
        
        var mediaUpdated = false
        if let updatedMediaReference = updatedMediaReference, let previousMediaReference = self.previousMediaReference {
            mediaUpdated = !updatedMediaReference.media.isEqual(to: previousMediaReference.media)
        } else if (updatedMediaReference != nil) != (self.previousMediaReference != nil) {
            mediaUpdated = true
        }
        self.previousMediaReference = updatedMediaReference
        
        var isPhoto = false
        var updateImageSignal: Signal<(TransformImageArguments) -> DrawingContext?, NoError>?
        if mediaUpdated {
            if let updatedMediaReference = updatedMediaReference, imageDimensions != nil {
                if let imageReference = updatedMediaReference.concrete(TelegramMediaImage.self) {
                    updateImageSignal = chatMessagePhotoThumbnail(account: self.context.account, photoReference: imageReference)
                    isPhoto = true
                } else if let fileReference = updatedMediaReference.concrete(TelegramMediaFile.self) {
                    if fileReference.media.isVideo {
                        updateImageSignal = chatMessageVideoThumbnail(account: self.context.account, fileReference: fileReference)
                    } else if let iconImageRepresentation = smallestImageRepresentation(fileReference.media.previewRepresentations) {
                        updateImageSignal = chatWebpageSnippetFile(account: self.context.account, fileReference: fileReference, representation: iconImageRepresentation)
                    }
                }
            } else {
                updateImageSignal = .single({ _ in return nil })
            }
        }
        self.isPhoto = isPhoto
        
        let isMedia: Bool
        if let message = message {
            var effectiveMessage = message
            if let currentEditMediaReference = self.currentEditMediaReference {
                effectiveMessage = effectiveMessage.withUpdatedMedia([currentEditMediaReference.media])
            }
            let presentationData = self.context.sharedContext.currentPresentationData.with { $0 }
            switch messageContentKind(contentSettings: self.context.currentContentSettings.with { $0 }, message: EngineMessage(effectiveMessage), strings: strings, nameDisplayOrder: nameDisplayOrder, dateTimeFormat: presentationData.dateTimeFormat, accountPeerId: self.context.account.peerId) {
                case .text:
                    isMedia = false
                default:
                    isMedia = true
            }
        } else {
            isMedia = false
        }
        
        let canEditMedia: Bool
        if let message = message, !messageMediaEditingOptions(message: message).isEmpty {
            canEditMedia = true
        } else {
            canEditMedia = false
        }
        
        let titleString: String
        if canEditMedia {
            titleString = isPhoto ? self.strings.Conversation_EditingPhotoPanelTitle : self.strings.Conversation_EditingCaptionPanelTitle
        } else {
            titleString = self.strings.Conversation_EditingMessagePanelTitle
        }
        self.titleNode.attributedText = NSAttributedString(string: titleString, font: Font.medium(15.0), textColor: self.theme.chat.inputPanel.panelControlAccentColor)
        self.textNode.attributedText = NSAttributedString(string: text, font: Font.regular(15.0), textColor: isMedia ? self.theme.chat.inputPanel.secondaryTextColor : self.theme.chat.inputPanel.primaryTextColor)
        
        let headerString: String = titleString
        self.actionArea.accessibilityLabel = "\(headerString).\n\(text)"
        
        if let applyImage = applyImage {
            applyImage()
            self.imageNode.isHidden = false
        } else {
            self.imageNode.isHidden = true
        }
        
        if isPhoto && !self.imageNode.isHidden {
            self.dimNode.isHidden = false
            self.drawIconNode.isHidden = false
        } else {
            self.dimNode.isHidden = true
            self.drawIconNode.isHidden = true
        }
        
        if let updateImageSignal = updateImageSignal {
            self.imageNode.setSignal(.single({ arguments in
                /*let context = DrawingContext(size: arguments.boundingSize)
                context.withContext { c in
                    c.setFillColor(UIColor.white.cgColor)
                    c.fill(CGRect(origin: CGPoint(), size: context.size))
                }
                return context*/
                return nil
            }) |> then(updateImageSignal))
        }
        
        if let (size, inset, interfaceState) = self.validLayout {
            self.updateState(size: size, inset: inset, interfaceState: interfaceState)
        }
    }
    
    override func animateIn() {
        self.iconNode.layer.animateScale(from: 0.001, to: 1.0, duration: 0.2)
    }
    
    override func animateOut() {
        self.iconNode.layer.animateScale(from: 1.0, to: 0.001, duration: 0.2, removeOnCompletion: false)
    }
    
    override func updateThemeAndStrings(theme: PresentationTheme, strings: PresentationStrings) {
        if self.theme !== theme {
            self.theme = theme
            
            self.closeButton.setImage(PresentationResourcesChat.chatInputPanelCloseIconImage(theme), for: [])
            self.lineNode.image = PresentationResourcesChat.chatInputPanelVerticalSeparatorLineImage(theme)
            self.iconNode.image = PresentationResourcesChat.chatInputPanelEditIconImage(theme)
            
            if let text = self.titleNode.attributedText?.string {
                self.titleNode.attributedText = NSAttributedString(string: text, font: Font.medium(15.0), textColor: self.theme.chat.inputPanel.panelControlAccentColor)
            }
            
            if let text = self.textNode.attributedText?.string {
                self.textNode.attributedText = NSAttributedString(string: text, font: Font.regular(15.0), textColor: self.theme.chat.inputPanel.primaryTextColor)
            }
            
            if let (size, inset, interfaceState) = self.validLayout {
                self.updateState(size: size, inset: inset, interfaceState: interfaceState)
            }
        }
    }
    
    override func calculateSizeThatFits(_ constrainedSize: CGSize) -> CGSize {
        return CGSize(width: constrainedSize.width, height: 45.0)
    }
    
    override func updateState(size: CGSize, inset: CGFloat, interfaceState: ChatPresentationInterfaceState) {
        self.validLayout = (size, inset, interfaceState)
        
        let editMediaReference = interfaceState.editMessageState?.mediaReference
        var updatedEditMedia = false
        if let currentEditMediaReference = self.currentEditMediaReference, let editMediaReference = editMediaReference {
            if !currentEditMediaReference.media.isEqual(to: editMediaReference.media) {
                updatedEditMedia = true
            }
        } else if (editMediaReference != nil) != (self.currentEditMediaReference != nil) {
            updatedEditMedia = true
        }
        if updatedEditMedia {
            if let editMediaReference = editMediaReference {
                self.currentEditMediaReference = editMediaReference
            } else {
                self.currentEditMediaReference = nil
            }
            self.updateMessage(self.currentMessage)
        }
        
        let bounds = CGRect(origin: CGPoint(), size: CGSize(width: size.width, height: 45.0))
        let textLineInset: CGFloat = 10.0
        let leftInset: CGFloat = 55.0 + inset
        let rightInset: CGFloat = 55.0 + inset
        let textRightInset: CGFloat = 20.0
        
        let indicatorSize = CGSize(width: 22.0, height: 22.0)
        self.activityIndicator.frame = CGRect(origin: CGPoint(x: 18.0, y: 15.0), size: indicatorSize)
        self.statusNode.frame = CGRect(origin: CGPoint(x: 18.0, y: 15.0), size: indicatorSize).insetBy(dx: -2.0, dy: -2.0)
        
        let closeButtonSize = CGSize(width: 44.0, height: bounds.height)
        let closeButtonFrame = CGRect(origin: CGPoint(x: bounds.width - closeButtonSize.width - inset, y: 2.0), size: closeButtonSize)
        self.closeButton.frame = closeButtonFrame
        
        self.actionArea.frame = CGRect(origin: CGPoint(x: leftInset, y: 2.0), size: CGSize(width: closeButtonFrame.minX - leftInset, height: bounds.height))
        
        self.lineNode.frame = CGRect(origin: CGPoint(x: leftInset, y: 8.0), size: CGSize(width: 2.0, height: bounds.size.height - 10.0))
        
        if let icon = self.iconNode.image {
            self.iconNode.frame = CGRect(origin: CGPoint(x: 7.0 + inset, y: 10.0), size: icon.size)
        }
        
        var imageTextInset: CGFloat = 0.0
        if !self.imageNode.isHidden {
            imageTextInset = 9.0 + 35.0
        }
        self.imageNode.frame = CGRect(origin: CGPoint(x: leftInset + 9.0, y: 8.0), size: CGSize(width: 35.0, height: 35.0))
        self.dimNode.frame = self.imageNode.frame
        self.drawIconNode.frame = self.imageNode.frame
        
        let titleSize = self.titleNode.updateLayout(CGSize(width: bounds.size.width - leftInset - textLineInset - rightInset - textRightInset - imageTextInset, height: bounds.size.height))
        self.titleNode.frame = CGRect(origin: CGPoint(x: leftInset + textLineInset + imageTextInset, y: 7.0), size: titleSize)
        
        let textSize = self.textNode.updateLayout(CGSize(width: bounds.size.width - leftInset - textLineInset - rightInset - textRightInset - imageTextInset, height: bounds.size.height))
        self.textNode.frame = CGRect(origin: CGPoint(x: leftInset + textLineInset + imageTextInset, y: 25.0), size: textSize)
        
        self.tapNode.frame = CGRect(origin: CGPoint(x: leftInset, y: 0.0), size: CGSize(width: bounds.width - leftInset - rightInset - closeButtonSize.width - 4.0, height: bounds.height))
    }
    
    @objc func closePressed() {
        if let dismiss = self.dismiss {
            dismiss()
        }
    }
    
    @objc func contentTap(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state, let message = self.currentMessage {
            if self.isPhoto {
                self.interfaceInteraction?.editMessageMedia(message.id, true)
            } else {
                self.interfaceInteraction?.navigateToMessage(message.id, false, true, .generic)
            }
        }
    }
}