import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import TelegramCore
import Postbox
import TelegramPresentationData
import TelegramUIPreferences
import ItemListUI
import PresentationDataUtils
import AccountContext
import WallpaperBackgroundNode
import AvatarNode
import ReactionSelectionNode

class ReactionChatPreviewItem: ListViewItem, ItemListItem {
    let context: AccountContext
    let theme: PresentationTheme
    let strings: PresentationStrings
    let sectionId: ItemListSectionId
    let fontSize: PresentationFontSize
    let chatBubbleCorners: PresentationChatBubbleCorners
    let wallpaper: TelegramWallpaper
    let dateTimeFormat: PresentationDateTimeFormat
    let nameDisplayOrder: PresentationPersonNameOrder
    let availableReactions: AvailableReactions?
    let reaction: String?
    
    init(context: AccountContext, theme: PresentationTheme, strings: PresentationStrings, sectionId: ItemListSectionId, fontSize: PresentationFontSize, chatBubbleCorners: PresentationChatBubbleCorners, wallpaper: TelegramWallpaper, dateTimeFormat: PresentationDateTimeFormat, nameDisplayOrder: PresentationPersonNameOrder, availableReactions: AvailableReactions?, reaction: String?) {
        self.context = context
        self.theme = theme
        self.strings = strings
        self.sectionId = sectionId
        self.fontSize = fontSize
        self.chatBubbleCorners = chatBubbleCorners
        self.wallpaper = wallpaper
        self.dateTimeFormat = dateTimeFormat
        self.nameDisplayOrder = nameDisplayOrder
        self.availableReactions = availableReactions
        self.reaction = reaction
    }
    
    func nodeConfiguredForParams(async: @escaping (@escaping () -> Void) -> Void, params: ListViewItemLayoutParams, synchronousLoads: Bool, previousItem: ListViewItem?, nextItem: ListViewItem?, completion: @escaping (ListViewItemNode, @escaping () -> (Signal<Void, NoError>?, (ListViewItemApply) -> Void)) -> Void) {
        async {
            let node = ReactionChatPreviewItemNode()
            let (layout, apply) = node.asyncLayout()(self, params, itemListNeighbors(item: self, topItem: previousItem as? ItemListItem, bottomItem: nextItem as? ItemListItem))
            
            node.contentSize = layout.contentSize
            node.insets = layout.insets
            
            Queue.mainQueue().async {
                completion(node, {
                    return (nil, { _ in apply() })
                })
            }
        }
    }
    
    func updateNode(async: @escaping (@escaping () -> Void) -> Void, node: @escaping () -> ListViewItemNode, params: ListViewItemLayoutParams, previousItem: ListViewItem?, nextItem: ListViewItem?, animation: ListViewItemUpdateAnimation, completion: @escaping (ListViewItemNodeLayout, @escaping (ListViewItemApply) -> Void) -> Void) {
        Queue.mainQueue().async {
            if let nodeValue = node() as? ReactionChatPreviewItemNode {
                let makeLayout = nodeValue.asyncLayout()
                
                async {
                    let (layout, apply) = makeLayout(self, params, itemListNeighbors(item: self, topItem: previousItem as? ItemListItem, bottomItem: nextItem as? ItemListItem))
                    Queue.mainQueue().async {
                        completion(layout, { _ in
                            apply()
                        })
                    }
                }
            }
        }
    }
}

class ReactionChatPreviewItemNode: ListViewItemNode {
    private var backgroundNode: WallpaperBackgroundNode?
    private let topStripeNode: ASDisplayNode
    private let bottomStripeNode: ASDisplayNode
    private let maskNode: ASImageNode
    private let avatarNode: ASImageNode
    
    private let containerNode: ASDisplayNode
    
    private var messageNode: ListViewItemNode?
    
    private var item: ReactionChatPreviewItem?
    private(set) weak var standaloneReactionAnimation: StandaloneReactionAnimation?
    
    init() {
        self.topStripeNode = ASDisplayNode()
        self.topStripeNode.isLayerBacked = true
        
        self.bottomStripeNode = ASDisplayNode()
        self.bottomStripeNode.isLayerBacked = true
        
        self.maskNode = ASImageNode()
        
        self.avatarNode = ASImageNode()
        
        self.containerNode = ASDisplayNode()
        self.containerNode.subnodeTransform = CATransform3DMakeRotation(CGFloat.pi, 0.0, 0.0, 1.0)
        
        super.init(layerBacked: false, dynamicBounce: false)
        
        self.clipsToBounds = true
        
        self.addSubnode(self.avatarNode)
        self.addSubnode(self.containerNode)
    }
    
    override func didLoad() {
        super.didLoad()
        
        let recognizer = TapLongTapOrDoubleTapGestureRecognizer(target: self, action: #selector(self.tapLongTapOrDoubleTapGesture(_:)))
        recognizer.tapActionAtPoint = { _ in
            return .waitForDoubleTap
        }
        self.view.addGestureRecognizer(recognizer)
    }
    
    @objc private func tapLongTapOrDoubleTapGesture(_ recognizer: TapLongTapOrDoubleTapGestureRecognizer) {
        switch recognizer.state {
        case .ended:
            if let (gesture, _) = recognizer.lastRecognizedGestureAndLocation {
                switch gesture {
                case .doubleTap:
                    if let item = self.item, let updatedReaction = item.reaction, let availableReactions = item.availableReactions, let messageNode = self.messageNode as? ChatMessageItemNodeProtocol {
                        if let targetView = messageNode.targetReactionView(value: updatedReaction) {
                            for reaction in availableReactions.reactions {
                                if reaction.value == updatedReaction {
                                    if let standaloneReactionAnimation = self.standaloneReactionAnimation {
                                        standaloneReactionAnimation.cancel()
                                        standaloneReactionAnimation.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2, removeOnCompletion: false, completion: { [weak standaloneReactionAnimation] _ in
                                            standaloneReactionAnimation?.removeFromSupernode()
                                        })
                                        self.standaloneReactionAnimation = nil
                                    }
                                    
                                    if let supernode = self.supernode {
                                        let standaloneReactionAnimation = StandaloneReactionAnimation()
                                        self.standaloneReactionAnimation = standaloneReactionAnimation
                                        
                                        supernode.addSubnode(standaloneReactionAnimation)
                                        standaloneReactionAnimation.frame = supernode.bounds
                                        standaloneReactionAnimation.animateReactionSelection(
                                            context: item.context, theme: item.theme, reaction: ReactionContextItem(
                                                reaction: ReactionContextItem.Reaction(rawValue: reaction.value),
                                                appearAnimation: reaction.appearAnimation,
                                                stillAnimation: reaction.selectAnimation,
                                                listAnimation: reaction.activateAnimation,
                                                applicationAnimation: reaction.effectAnimation
                                            ),
                                            targetView: targetView,
                                            hideNode: true,
                                            completion: { [weak standaloneReactionAnimation] in
                                            standaloneReactionAnimation?.removeFromSupernode()
                                            }
                                        )
                                    }
                                    
                                    break
                                }
                            }
                        }
                    }
                default:
                    break
                }
            }
        default:
            break
        }
    }
    
    func asyncLayout() -> (_ item: ReactionChatPreviewItem, _ params: ListViewItemLayoutParams, _ neighbors: ItemListNeighbors) -> (ListViewItemNodeLayout, () -> Void) {
        let currentNode = self.messageNode

        var currentBackgroundNode = self.backgroundNode
        
        return { item, params, neighbors in
            if currentBackgroundNode == nil {
                currentBackgroundNode = createWallpaperBackgroundNode(context: item.context, forChatDisplay: false)
            }
            currentBackgroundNode?.update(wallpaper: item.wallpaper)
            currentBackgroundNode?.updateBubbleTheme(bubbleTheme: item.theme, bubbleCorners: item.chatBubbleCorners)
            
            let insets: UIEdgeInsets
            let separatorHeight = UIScreenPixel
            
            let chatPeerId = PeerId(namespace: Namespaces.Peer.CloudGroup, id: PeerId.Id._internalFromInt64Value(1))
            let userPeerId = PeerId(namespace: Namespaces.Peer.CloudUser, id: PeerId.Id._internalFromInt64Value(2))
            
            var peers = SimpleDictionary<PeerId, Peer>()
            let messages = SimpleDictionary<MessageId, Message>()
            
            peers[chatPeerId] = TelegramGroup(id: chatPeerId, title: "Chat", photo: [], participantCount: 1, role: .member, membership: .Member, flags: [], defaultBannedRights: nil, migrationReference: nil, creationDate: 1, version: 1)
            //TODO:localize
            peers[userPeerId] = TelegramUser(id: userPeerId, accessHash: nil, firstName: "Dino", lastName: "", username: nil, phone: nil, photo: [], botInfo: nil, restrictionInfo: nil, flags: [])
            
            //TODO:localize
            let messageText = "I hope you're enjoying your day as much as I am."
            
            var attributes: [MessageAttribute] = []
            if let reaction = item.reaction {
                attributes.append(ReactionsMessageAttribute(reactions: [MessageReaction(value: reaction, count: 1, isSelected: true)], recentPeers: []))
            }
            
            let messageItem = item.context.sharedContext.makeChatMessagePreviewItem(context: item.context, messages: [Message(stableId: 1, stableVersion: 0, id: MessageId(peerId: chatPeerId, namespace: 0, id: 1), globallyUniqueId: nil, groupingKey: nil, groupInfo: nil, threadId: nil, timestamp: 66000, flags: [.Incoming], tags: [], globalTags: [], localTags: [], forwardInfo: nil, author: peers[userPeerId], text: messageText, attributes: attributes, media: [], peers: peers, associatedMessages: messages, associatedMessageIds: [])], theme: item.theme, strings: item.strings, wallpaper: item.wallpaper, fontSize: item.fontSize, chatBubbleCorners: item.chatBubbleCorners, dateTimeFormat: item.dateTimeFormat, nameOrder: item.nameDisplayOrder, forcedResourceStatus: nil, tapMessage: nil, clickThroughMessage: nil, backgroundNode: currentBackgroundNode, availableReactions: item.availableReactions)
            
            var node: ListViewItemNode?
            if let current = currentNode {
                node = current
                messageItem.updateNode(async: { $0() }, node: { return current }, params: params, previousItem: nil, nextItem: nil, animation: .None, completion: { (layout, apply) in
                    let nodeFrame = CGRect(origin: current.frame.origin, size: CGSize(width: layout.size.width, height: layout.size.height))
                    
                    current.contentSize = layout.contentSize
                    current.insets = layout.insets
                    current.frame = nodeFrame
                    
                    apply(ListViewItemApply(isOnScreen: true))
                })
            } else {
                messageItem.nodeConfiguredForParams(async: { $0() }, params: params, synchronousLoads: false, previousItem: nil, nextItem: nil, completion: { messageNode, apply in
                    node = messageNode
                    apply().1(ListViewItemApply(isOnScreen: true))
                })
                node?.isUserInteractionEnabled = false
            }
            
            var contentSize = CGSize(width: params.width, height: 8.0 + 8.0)
            if let node = node {
                contentSize.height += node.frame.size.height
            }
            insets = itemListNeighborsGroupedInsets(neighbors, params)
            
            let layout = ListViewItemNodeLayout(contentSize: contentSize, insets: insets)
            let layoutSize = layout.size
            
            return (layout, { [weak self] in
                if let strongSelf = self {
                    if let previousItem = strongSelf.item, previousItem.reaction != item.reaction {
                        if let standaloneReactionAnimation = strongSelf.standaloneReactionAnimation {
                            standaloneReactionAnimation.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2, removeOnCompletion: false, completion: { [weak standaloneReactionAnimation] _ in
                                standaloneReactionAnimation?.removeFromSupernode()
                            })
                            strongSelf.standaloneReactionAnimation = nil
                        }
                    }
                       
                    strongSelf.item = item
                    
                    strongSelf.containerNode.frame = CGRect(origin: CGPoint(), size: contentSize)
                    
                    var topOffset: CGFloat = 8.0
                    if let node = node {
                        strongSelf.messageNode = node
                        if node.supernode == nil {
                            strongSelf.containerNode.addSubnode(node)
                        }
                        node.updateFrame(CGRect(origin: CGPoint(x: 0.0, y: topOffset), size: node.frame.size), within: layout.contentSize)
                        
                        let avatarSize: CGFloat = 34.0
                        if strongSelf.avatarNode.image == nil {
                            strongSelf.avatarNode.image = generateImage(CGSize(width: avatarSize, height: avatarSize), rotatedContext: { size, context in
                                context.clear(CGRect(origin: CGPoint(), size: size))
                                context.addEllipse(in: CGRect(origin: CGPoint(), size: size))
                                context.clip()
                                UIGraphicsPushContext(context)
                                if let image = UIImage(bundleImageName: "Avatar/SampleAvatar1") {
                                    image.draw(in: CGRect(origin: CGPoint(), size: size))
                                }
                                UIGraphicsPopContext()
                            })
                        }
                        
                        topOffset += node.frame.size.height
                        
                        strongSelf.avatarNode.frame = CGRect(origin: CGPoint(x: params.leftInset + 7.0, y: topOffset - avatarSize), size: CGSize(width: avatarSize, height: avatarSize))
                    }

                    strongSelf.topStripeNode.backgroundColor = item.theme.list.itemBlocksSeparatorColor
                    strongSelf.bottomStripeNode.backgroundColor = item.theme.list.itemBlocksSeparatorColor

                    if let currentBackgroundNode = currentBackgroundNode, strongSelf.backgroundNode !== currentBackgroundNode {
                        strongSelf.backgroundNode = currentBackgroundNode
                        strongSelf.insertSubnode(currentBackgroundNode, at: 0)
                    }

                    if strongSelf.topStripeNode.supernode == nil {
                        strongSelf.insertSubnode(strongSelf.topStripeNode, at: 1)
                    }
                    if strongSelf.bottomStripeNode.supernode == nil {
                        strongSelf.insertSubnode(strongSelf.bottomStripeNode, at: 2)
                    }
                    if strongSelf.maskNode.supernode == nil {
                        strongSelf.insertSubnode(strongSelf.maskNode, at: 3)
                    }
                    let hasCorners = itemListHasRoundedBlockLayout(params)
                    var hasTopCorners = false
                    var hasBottomCorners = false
                    switch neighbors.top {
                        case .sameSection(false):
                            strongSelf.topStripeNode.isHidden = true
                        default:
                            hasTopCorners = true
                            strongSelf.topStripeNode.isHidden = hasCorners
                    }
                    let bottomStripeInset: CGFloat
                    let bottomStripeOffset: CGFloat
                    switch neighbors.bottom {
                        case .sameSection(false):
                            bottomStripeInset = 0.0
                            bottomStripeOffset = -separatorHeight
                        default:
                            bottomStripeInset = 0.0
                            bottomStripeOffset = 0.0
                            hasBottomCorners = true
                            strongSelf.bottomStripeNode.isHidden = hasCorners
                    }
                    
                    strongSelf.maskNode.image = hasCorners ? PresentationResourcesItemList.cornersImage(item.theme, top: hasTopCorners, bottom: hasBottomCorners) : nil
                    
                    let backgroundFrame = CGRect(origin: CGPoint(x: 0.0, y: -min(insets.top, separatorHeight)), size: CGSize(width: params.width, height: contentSize.height + min(insets.top, separatorHeight) + min(insets.bottom, separatorHeight)))

                    if let backgroundNode = strongSelf.backgroundNode {
                        backgroundNode.frame = backgroundFrame.insetBy(dx: 0.0, dy: -100.0)
                        backgroundNode.update(wallpaper: item.wallpaper)
                        backgroundNode.updateBubbleTheme(bubbleTheme: item.theme, bubbleCorners: item.chatBubbleCorners)
                        backgroundNode.updateLayout(size: backgroundNode.bounds.size, transition: .immediate)
                    }

                    strongSelf.maskNode.frame = backgroundFrame.insetBy(dx: params.leftInset, dy: 0.0)
                    strongSelf.topStripeNode.frame = CGRect(origin: CGPoint(x: 0.0, y: -min(insets.top, separatorHeight)), size: CGSize(width: layoutSize.width, height: separatorHeight))
                    strongSelf.bottomStripeNode.frame = CGRect(origin: CGPoint(x: bottomStripeInset, y: contentSize.height + bottomStripeOffset), size: CGSize(width: layoutSize.width - bottomStripeInset, height: separatorHeight))
                }
            })
        }
    }
    
    override func animateInsertion(_ currentTimestamp: Double, duration: Double, short: Bool) {
        self.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.4)
    }
    
    override func animateRemoved(_ currentTimestamp: Double, duration: Double) {
        self.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.15, removeOnCompletion: false)
    }
}