import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import TelegramPresentationData
import Postbox
import TelegramCore
import ItemListUI
import EmojiStatusComponent
import ComponentFlow
import AccountContext

public enum ItemListReactionArrowStyle {
    case arrow
    case none
}

public class ItemListReactionItem: ListViewItem, ItemListItem {
    let context: AccountContext
    let presentationData: ItemListPresentationData
    let icon: UIImage?
    let title: String
    let arrowStyle: ItemListReactionArrowStyle
    let reaction: MessageReaction.Reaction
    let availableReactions: AvailableReactions?
    public let sectionId: ItemListSectionId
    let style: ItemListStyle
    let action: (() -> Void)?
    public let tag: ItemListItemTag?
    
    public init(context: AccountContext, presentationData: ItemListPresentationData, icon: UIImage? = nil, title: String, arrowStyle: ItemListReactionArrowStyle = .none, reaction: MessageReaction.Reaction, availableReactions: AvailableReactions?, sectionId: ItemListSectionId, style: ItemListStyle, action: (() -> Void)?, tag: ItemListItemTag? = nil) {
        self.context = context
        self.presentationData = presentationData
        self.icon = icon
        self.title = title
        self.arrowStyle = arrowStyle
        self.reaction = reaction
        self.availableReactions = availableReactions
        self.sectionId = sectionId
        self.style = style
        self.action = action
        self.tag = tag
    }
    
    public 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 {
            Queue.mainQueue().async {
                let node = ItemListReactionItemNode()
                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
                
                completion(node, {
                    return (nil, { _ in apply() })
                })
            }
        }
    }
    
    public 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? ItemListReactionItemNode {
                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()
                        })
                    }
                }
            }
        }
    }
    
    public var selectable: Bool = true
    
    public func selected(listView: ListView){
        listView.clearHighlightAnimated(true)
        self.action?()
    }
}

private let badgeFont = Font.regular(15.0)

public class ItemListReactionItemNode: ListViewItemNode, ItemListItemNode {
    private let backgroundNode: ASDisplayNode
    private let topStripeNode: ASDisplayNode
    private let bottomStripeNode: ASDisplayNode
    private let highlightedBackgroundNode: ASDisplayNode
    private let maskNode: ASImageNode
    
    let iconNode: ASImageNode
    let titleNode: TextNode
    let arrowNode: ASImageNode
    let iconView: ComponentHostView<Empty>
    
    private let activateArea: AccessibilityAreaNode
    
    private var item: ItemListReactionItem?
    private var fileDisposable: Disposable?
    private var file: TelegramMediaFile?
    
    override public var canBeSelected: Bool {
        if let item = self.item, let _ = item.action {
            return true
        } else {
            return false
        }
    }
    
    public var tag: ItemListItemTag? {
        return self.item?.tag
    }
    
    public init() {
        self.backgroundNode = ASDisplayNode()
        self.backgroundNode.isLayerBacked = true
        self.backgroundNode.backgroundColor = .white
        
        self.maskNode = ASImageNode()
        self.maskNode.isUserInteractionEnabled = false
        
        self.topStripeNode = ASDisplayNode()
        self.topStripeNode.isLayerBacked = true
        
        self.bottomStripeNode = ASDisplayNode()
        self.bottomStripeNode.isLayerBacked = true
        
        self.iconNode = ASImageNode()
        self.iconNode.isLayerBacked = true
        self.iconNode.displaysAsynchronously = false
        
        self.titleNode = TextNode()
        self.titleNode.isUserInteractionEnabled = false
        
        self.iconView = ComponentHostView<Empty>()
        
        self.arrowNode = ASImageNode()
        self.arrowNode.displayWithoutProcessing = true
        self.arrowNode.displaysAsynchronously = false
        self.arrowNode.isLayerBacked = true
        
        self.highlightedBackgroundNode = ASDisplayNode()
        self.highlightedBackgroundNode.isLayerBacked = true
        
        self.activateArea = AccessibilityAreaNode()
        
        super.init(layerBacked: false, dynamicBounce: false)
        
        self.addSubnode(self.titleNode)
        self.view.addSubview(self.iconView)
        self.addSubnode(self.arrowNode)
        
        self.addSubnode(self.activateArea)
    }
    
    deinit {
        self.fileDisposable?.dispose()
    }
    
    public func asyncLayout() -> (_ item: ItemListReactionItem, _ params: ListViewItemLayoutParams, _ insets: ItemListNeighbors) -> (ListViewItemNodeLayout, () -> Void) {
        let makeTitleLayout = TextNode.asyncLayout(self.titleNode)
        
        let currentItem = self.item
        
        return { item, params, neighbors in
            var rightInset: CGFloat
            rightInset = 34.0 + params.rightInset
            let _ = rightInset
            
            let contentSize: CGSize
            let insets: UIEdgeInsets
            let separatorHeight = UIScreenPixel
            let itemBackgroundColor: UIColor
            let itemSeparatorColor: UIColor
            
            var updatedTheme: PresentationTheme?
            var updateArrowImage: UIImage?
            if currentItem?.presentationData.theme !== item.presentationData.theme {
                updatedTheme = item.presentationData.theme
                updateArrowImage = PresentationResourcesItemList.disclosureArrowImage(item.presentationData.theme)
            }
            
            var updateIcon = false
            if currentItem?.icon != item.icon {
                updateIcon = true
            }
        
            var leftInset = 16.0 + params.leftInset
            if item.icon != nil {
                leftInset += 43.0
            }
            
            var additionalTextRightInset: CGFloat = 0.0
            additionalTextRightInset += 44.0
            if item.arrowStyle == .arrow {
                additionalTextRightInset += 24.0
            }
            
            let titleColor: UIColor = item.presentationData.theme.list.itemPrimaryTextColor
            
            let titleFont = Font.regular(item.presentationData.fontSize.itemListBaseFontSize)
            
            let (titleLayout, titleApply) = makeTitleLayout(TextNodeLayoutArguments(attributedString: NSAttributedString(string: item.title, font: titleFont, textColor: titleColor), backgroundColor: nil, maximumNumberOfLines: 1, truncationType: .end, constrainedSize: CGSize(width: params.width - params.rightInset - 20.0 - leftInset - additionalTextRightInset, height: CGFloat.greatestFiniteMagnitude), alignment: .natural, cutout: nil, insets: UIEdgeInsets()))
            
            let verticalInset: CGFloat = 11.0
            
            let height: CGFloat
            height = verticalInset * 2.0 + titleLayout.size.height
            
            switch item.style {
            case .plain:
                itemBackgroundColor = item.presentationData.theme.list.plainBackgroundColor
                itemSeparatorColor = item.presentationData.theme.list.itemPlainSeparatorColor
                contentSize = CGSize(width: params.width, height: height)
                insets = itemListNeighborsPlainInsets(neighbors)
            case .blocks:
                itemBackgroundColor = item.presentationData.theme.list.itemBlocksBackgroundColor
                itemSeparatorColor = item.presentationData.theme.list.itemBlocksSeparatorColor
                contentSize = CGSize(width: params.width, height: height)
                insets = itemListNeighborsGroupedInsets(neighbors, params)
            }
            
            let layout = ListViewItemNodeLayout(contentSize: contentSize, insets: insets)
            
            return (ListViewItemNodeLayout(contentSize: contentSize, insets: insets), { [weak self] in
                if let strongSelf = self {
                    strongSelf.item = item
                    
                    strongSelf.activateArea.frame = CGRect(origin: CGPoint(x: params.leftInset, y: 0.0), size: CGSize(width: params.width - params.leftInset - params.rightInset, height: layout.contentSize.height))
                    strongSelf.activateArea.accessibilityLabel = item.title
                    
                    strongSelf.activateArea.accessibilityTraits = []
                    
                    if let icon = item.icon {
                        if strongSelf.iconNode.supernode == nil {
                            strongSelf.addSubnode(strongSelf.iconNode)
                        }
                        if updateIcon {
                            strongSelf.iconNode.image = icon
                        }
                        let iconY = floor((layout.contentSize.height - icon.size.height) / 2.0)
                        strongSelf.iconNode.frame = CGRect(origin: CGPoint(x: params.leftInset + floor((leftInset - params.leftInset - icon.size.width) / 2.0), y: iconY), size: icon.size)
                    } else if strongSelf.iconNode.supernode != nil {
                        strongSelf.iconNode.image = nil
                        strongSelf.iconNode.removeFromSupernode()
                    }
                    
                    if let _ = updatedTheme {
                        strongSelf.topStripeNode.backgroundColor = itemSeparatorColor
                        strongSelf.bottomStripeNode.backgroundColor = itemSeparatorColor
                        strongSelf.backgroundNode.backgroundColor = itemBackgroundColor
                        strongSelf.highlightedBackgroundNode.backgroundColor = item.presentationData.theme.list.itemHighlightedBackgroundColor
                        
                    }
                    
                    if let updateArrowImage = updateArrowImage {
                        strongSelf.arrowNode.image = updateArrowImage
                    }
                    
                    let _ = titleApply()
                    
                    switch item.style {
                    case .plain:
                        if strongSelf.backgroundNode.supernode != nil {
                            strongSelf.backgroundNode.removeFromSupernode()
                        }
                        if strongSelf.topStripeNode.supernode != nil {
                            strongSelf.topStripeNode.removeFromSupernode()
                        }
                        if strongSelf.bottomStripeNode.supernode == nil {
                            strongSelf.insertSubnode(strongSelf.bottomStripeNode, at: 0)
                        }
                        if strongSelf.maskNode.supernode != nil {
                            strongSelf.maskNode.removeFromSupernode()
                        }
                        strongSelf.bottomStripeNode.frame = CGRect(origin: CGPoint(x: leftInset, y: contentSize.height - separatorHeight), size: CGSize(width: params.width - leftInset, height: separatorHeight))
                    case .blocks:
                        if strongSelf.backgroundNode.supernode == nil {
                            strongSelf.insertSubnode(strongSelf.backgroundNode, 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
                        switch neighbors.bottom {
                            case .sameSection(false):
                                bottomStripeInset = leftInset
                                strongSelf.bottomStripeNode.isHidden = false
                            default:
                                bottomStripeInset = 0.0
                                hasBottomCorners = true
                                strongSelf.bottomStripeNode.isHidden = hasCorners
                        }
                        
                        strongSelf.maskNode.image = hasCorners ? PresentationResourcesItemList.cornersImage(item.presentationData.theme, top: hasTopCorners, bottom: hasBottomCorners) : nil
                        
                        strongSelf.backgroundNode.frame = 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)))
                        strongSelf.maskNode.frame = strongSelf.backgroundNode.frame.insetBy(dx: params.leftInset, dy: 0.0)
                        strongSelf.topStripeNode.frame = CGRect(origin: CGPoint(x: 0.0, y: -min(insets.top, separatorHeight)), size: CGSize(width: params.width, height: separatorHeight))
                        strongSelf.bottomStripeNode.frame = CGRect(origin: CGPoint(x: bottomStripeInset, y: contentSize.height - separatorHeight), size: CGSize(width: params.width - bottomStripeInset, height: separatorHeight))
                    }
                    
                    let titleFrame = CGRect(origin: CGPoint(x: leftInset, y: 11.0), size: titleLayout.size)
                    strongSelf.titleNode.frame = titleFrame
                    
                    var animationContent: EmojiStatusComponent.AnimationContent?
                    switch item.reaction {
                    case .builtin:
                        if let availableReactions = item.availableReactions {
                            for reaction in availableReactions.reactions {
                                if reaction.value == item.reaction {
                                    animationContent = .file(file: reaction.selectAnimation._parse())
                                    break
                                }
                            }
                        }
                    case let .custom(fileId):
                        animationContent = .customEmoji(fileId: fileId)
                    case .stars:
                        if let availableReactions = item.availableReactions {
                            for reaction in availableReactions.reactions {
                                if reaction.value == item.reaction {
                                    animationContent = .file(file: reaction.selectAnimation._parse())
                                    break
                                }
                            }
                        }
                    }
                    
                    
                    var rightInset: CGFloat = 0.0
                    if let arrowImage = strongSelf.arrowNode.image, item.arrowStyle == .arrow {
                        let arrowRightOffset: CGFloat = 7.0
                        strongSelf.arrowNode.frame = CGRect(origin: CGPoint(x: params.width - params.rightInset - arrowRightOffset - arrowImage.size.width, y: floorToScreenPixels((height - arrowImage.size.height) / 2.0)), size: arrowImage.size)
                        rightInset += arrowRightOffset + arrowImage.size.width
                        strongSelf.arrowNode.isHidden = false
                    } else {
                        strongSelf.arrowNode.isHidden = true
                    }
                    
                    if let animationContent = animationContent {
                        let iconBoundingSize = CGSize(width: 28.0, height: 28.0)
                        let iconOffsetX: CGFloat = 0.0
                        let iconSize = strongSelf.iconView.update(
                            transition: .immediate,
                            component: AnyComponent(EmojiStatusComponent(
                                context: item.context,
                                animationCache: item.context.animationCache,
                                animationRenderer: item.context.animationRenderer,
                                content: .animation(content: animationContent, size: iconBoundingSize, placeholderColor: item.presentationData.theme.list.mediaPlaceholderColor, themeColor: item.presentationData.theme.list.itemAccentColor, loopMode: .forever),
                                isVisibleForAnimations: true,
                                action: nil
                            )),
                            environment: {},
                            containerSize: iconBoundingSize
                        )
                        strongSelf.iconView.isUserInteractionEnabled = false
                        strongSelf.iconView.frame = CGRect(origin: CGPoint(x: params.width - params.rightInset - 7.0 - iconSize.width + iconOffsetX - rightInset, y: floorToScreenPixels((height - iconSize.height) / 2.0)), size: iconSize)
                    }
                    
                    strongSelf.highlightedBackgroundNode.frame = CGRect(origin: CGPoint(x: 0.0, y: -UIScreenPixel), size: CGSize(width: params.width, height: height + UIScreenPixel))
                }
            })
        }
    }
    
    override public func setHighlighted(_ highlighted: Bool, at point: CGPoint, animated: Bool) {
        super.setHighlighted(highlighted, at: point, animated: animated)
        
        if highlighted {
            self.highlightedBackgroundNode.alpha = 1.0
            if self.highlightedBackgroundNode.supernode == nil {
                var anchorNode: ASDisplayNode?
                if self.bottomStripeNode.supernode != nil {
                    anchorNode = self.bottomStripeNode
                } else if self.topStripeNode.supernode != nil {
                    anchorNode = self.topStripeNode
                } else if self.backgroundNode.supernode != nil {
                    anchorNode = self.backgroundNode
                }
                if let anchorNode = anchorNode {
                    self.insertSubnode(self.highlightedBackgroundNode, aboveSubnode: anchorNode)
                } else {
                    self.addSubnode(self.highlightedBackgroundNode)
                }
            }
        } else {
            if self.highlightedBackgroundNode.supernode != nil {
                if animated {
                    self.highlightedBackgroundNode.layer.animateAlpha(from: self.highlightedBackgroundNode.alpha, to: 0.0, duration: 0.4, completion: { [weak self] completed in
                        if let strongSelf = self {
                            if completed {
                                strongSelf.highlightedBackgroundNode.removeFromSupernode()
                            }
                        }
                        })
                    self.highlightedBackgroundNode.alpha = 0.0
                } else {
                    self.highlightedBackgroundNode.removeFromSupernode()
                }
            }
        }
    }
    
    override public func animateInsertion(_ currentTimestamp: Double, duration: Double, options: ListViewItemAnimationOptions) {
        self.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.4)
    }
    
    override public func animateAdded(_ currentTimestamp: Double, duration: Double) {
        self.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
    }
    
    override public func animateRemoved(_ currentTimestamp: Double, duration: Double) {
        self.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.15, removeOnCompletion: false)
    }
}