import Foundation
import UIKit
import Display
import AsyncDisplayKit
import Postbox
import TelegramCore
import SwiftSignalKit
import StickerResources
import AnimatedStickerNode
import TelegramAnimatedStickerNode
import ContextUI
import SolidRoundedButtonNode
import TelegramPresentationData
import AccountContext
import AppBundle
import ReactionSelectionNode
import EntityKeyboard

public enum StickerPreviewPeekItem: Equatable {
    public static func == (lhs: StickerPreviewPeekItem, rhs: StickerPreviewPeekItem) -> Bool {
        switch lhs {
        case let .pack(lhsPack):
            if case let .pack(rhsPack) = rhs, lhsPack == rhsPack {
                return true
            } else {
                return false
            }
        case let .found(lhsItem):
            if case let .found(rhsItem) = rhs, lhsItem == rhsItem {
                return true
            } else {
                return false
            }
        case let .portal(lhsPortal):
            if case let .portal(rhsPortal) = rhs, lhsPortal === rhsPortal {
                return true
            } else {
                return false
            }
        }
    }
    
    case pack(TelegramMediaFile)
    case found(FoundStickerItem)
    case portal(PortalView)
    
    public var file: TelegramMediaFile? {
        switch self {
        case let .pack(file):
            return file
        case let .found(item):
            return item.file
        case .portal:
            return nil
        }
    }
}

public final class StickerPreviewPeekContent: PeekControllerContent {
    let context: AccountContext
    let theme: PresentationTheme
    let strings: PresentationStrings
    public let item: StickerPreviewPeekItem
    let isLocked: Bool
    let isCreating: Bool
    let selectedEmoji: [String]
    let selectedEmojiUpdated: ([String]) -> Void
    let recommendedEmoji: [String]
    let menu: [ContextMenuItem]
    let openPremiumIntro: () -> Void
    
    public init(context: AccountContext, theme: PresentationTheme, strings: PresentationStrings, item: StickerPreviewPeekItem, isLocked: Bool = false, isCreating: Bool = false, selectedEmoji: [String] = [], selectedEmojiUpdated: @escaping ([String]) -> Void = { _ in }, recommendedEmoji: [String] = [], menu: [ContextMenuItem], openPremiumIntro: @escaping () -> Void) {
        self.context = context
        self.theme = theme
        self.strings = strings
        self.item = item
        self.isLocked = isLocked
        self.isCreating = isCreating
        self.selectedEmoji = selectedEmoji
        self.selectedEmojiUpdated = selectedEmojiUpdated
        self.recommendedEmoji = recommendedEmoji
        if isLocked {
            self.menu = []
        } else {
            self.menu = menu
        }
        self.openPremiumIntro = openPremiumIntro
    }
    
    public func presentation() -> PeekControllerContentPresentation {
        return .freeform
    }
    
    public func menuActivation() -> PeerControllerMenuActivation {
        return .press
    }
    
    public func menuItems() -> [ContextMenuItem] {
        return self.menu
    }
    
    public func node() -> PeekControllerContentNode & ASDisplayNode {
        return StickerPreviewPeekContentNode(context: self.context, item: self.item, theme: self.theme)
    }
    
    public func topAccessoryNode() -> ASDisplayNode? {
        return nil
    }
    
    public func fullScreenAccessoryNode(blurView: UIVisualEffectView) -> (PeekControllerAccessoryNode & ASDisplayNode)? {
        if self.isCreating {
            return EmojiStickerAccessoryNode(context: self.context, theme: self.theme, recommendedEmoji: self.recommendedEmoji, selectedEmoji: self.selectedEmoji, selectedEmojiUpdated: self.selectedEmojiUpdated)
        }
        if self.isLocked {
            return PremiumStickerPackAccessoryNode(theme: self.theme, strings: self.strings, isEmoji: self.item.file?.isCustomEmoji ?? false, proceed: self.openPremiumIntro)
        } else {
            return nil
        }
    }
    
    public func isEqual(to: PeekControllerContent) -> Bool {
        if let to = to as? StickerPreviewPeekContent {
            return self.item == to.item
        } else {
            return false
        }
    }
}

public final class StickerPreviewPeekContentNode: ASDisplayNode, PeekControllerContentNode {
    private let context: AccountContext
    private let item: StickerPreviewPeekItem
    
    private var textNode: ASTextNode
    public var imageNode: TransformImageNode
    public var animationNode: AnimatedStickerNode?
    public var additionalAnimationNode: AnimatedStickerNode?
    private let portalWrapperNode: ASDisplayNode
    
    private let effectDisposable = MetaDisposable()
    
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    
    private let _ready = Promise<Bool>()
    
    init(context: AccountContext, item: StickerPreviewPeekItem, theme: PresentationTheme) {
        self.context = context
        self.item = item
        
        self.textNode = ASTextNode()
        self.imageNode = TransformImageNode()
        
        var isPremiumSticker = false
        if let file = item.file {
            for case let .Sticker(text, _, _) in file.attributes {
                self.textNode.attributedText = NSAttributedString(string: text, font: Font.regular(32.0), textColor: .black)
                break
            }
            
            isPremiumSticker = file.isPremiumSticker
            
            if file.isAnimatedSticker || file.isVideoSticker {
                let animationNode = DefaultAnimatedStickerNodeImpl()
                animationNode.overrideVisibility = true
                self.animationNode = animationNode
                
                let dimensions = file.dimensions ?? PixelDimensions(width: 512, height: 512)
                let fitSize: CGSize
                if file.isCustomEmoji {
                    fitSize = CGSize(width: 200.0, height: 200.0)
                } else {
                    fitSize = CGSize(width: 400.0, height: 400.0)
                }
                let fittedDimensions = dimensions.cgSize.aspectFitted(fitSize)
                
                if file.isCustomTemplateEmoji {
                    animationNode.dynamicColor = theme.list.itemPrimaryTextColor
                }
                
                animationNode.setup(source: AnimatedStickerResourceSource(account: context.account, resource: file.resource, isVideo: file.isVideoSticker), width: Int(fittedDimensions.width), height: Int(fittedDimensions.height), playbackMode: isPremiumSticker ? .once : .loop, mode: .direct(cachePathPrefix: nil))
                animationNode.visibility = true
                animationNode.addSubnode(self.textNode)
                
                if isPremiumSticker, let effect = file.videoThumbnails.first {
                    self.effectDisposable.set(freeMediaFileResourceInteractiveFetched(account: context.account, userLocation: .other, fileReference: .standalone(media: file), resource: effect.resource).start())
                    
                    let source = AnimatedStickerResourceSource(account: context.account, resource: effect.resource, fitzModifier: nil)
                    let additionalAnimationNode = DefaultAnimatedStickerNodeImpl()
                    additionalAnimationNode.setup(source: source, width: Int(fittedDimensions.width * 2.0), height: Int(fittedDimensions.height * 2.0), playbackMode: .once, mode: .direct(cachePathPrefix: nil))
                    additionalAnimationNode.visibility = true
                    self.additionalAnimationNode = additionalAnimationNode
                }
            } else {
                self.imageNode.addSubnode(self.textNode)
                self.animationNode = nil
            }
            
            self.imageNode.setSignal(chatMessageSticker(account: context.account, userLocation: .other, file: file, small: false, fetched: true))
        } else if case .portal = item {
            self._ready.set(.single(true))
        }
        
        self.portalWrapperNode = ASDisplayNode()
        self.portalWrapperNode.clipsToBounds = true
        self.portalWrapperNode.isUserInteractionEnabled = false
        
        super.init()
        
        self.isUserInteractionEnabled = false
        
        if let animationNode = self.animationNode {
            self.addSubnode(animationNode)
            
            if isPremiumSticker {
                animationNode.completed = { [weak self] _ in
                    if let strongSelf = self, let animationNode = strongSelf.animationNode, let additionalAnimationNode = strongSelf.additionalAnimationNode {
                        Queue.mainQueue().async {
                            animationNode.play(firstFrame: false, fromIndex: nil)
                            additionalAnimationNode.play(firstFrame: false, fromIndex: nil)
                        }
                    }
                }
            }
        } else {
            self.addSubnode(self.imageNode)
        }
        
        if let additionalAnimationNode = self.additionalAnimationNode {
            self.addSubnode(additionalAnimationNode)
        }
        
        self.addSubnode(self.portalWrapperNode)
        
        if let animationNode = self.animationNode {
            animationNode.started = { [weak self] in
                guard let strongSelf = self else {
                    return
                }
                strongSelf._ready.set(.single(true))
            }
        } else {
            self.imageNode.imageUpdated = { [weak self] _ in
                guard let strongSelf = self else {
                    return
                }
                strongSelf._ready.set(.single(true))
            }
        }
    }
    
    deinit {
        self.effectDisposable.dispose()
    }
    
    public override func didLoad() {
        super.didLoad()
        
        if case let .portal(portalView) = self.item {
            self.portalWrapperNode.view.addSubview(portalView.view)
        }
    }
    
    
    public func ready() -> Signal<Bool, NoError> {
        return self._ready.get()
    }
    
    public func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) -> CGSize {
        let boundingSize: CGSize
        if self.item.file?.isCustomEmoji == true {
            boundingSize = CGSize(width: 120.0, height: 120.0)
        } else if let _ = self.additionalAnimationNode {
            boundingSize = CGSize(width: 240.0, height: 240.0).fitted(size)
        } else {
            boundingSize = CGSize(width: 180.0, height: 180.0).fitted(size)
        }
        
        let dimensions: PixelDimensions
        if let dimensionsValue = self.item.file?.dimensions {
            dimensions = dimensionsValue
        } else {
            dimensions = PixelDimensions(width: 512, height: 512)
        }
        
        var topOffset: CGFloat = 0.0
        var textSpacing: CGFloat = 50.0
        
        if size.width == 292.0 {
            topOffset = 60.0
            textSpacing -= 10.0
        } else if size.width == 347.0 && size.height == 577.0 {
            topOffset = 60.0
            textSpacing -= 10.0
        }
        
        let textSize = self.textNode.measure(CGSize(width: 100.0, height: 100.0))
        if textSize.height.isZero {
            topOffset = 0.0
            textSpacing = 0.0
        }
        
        let imageSize = dimensions.cgSize.aspectFitted(boundingSize)
        self.imageNode.asyncLayout()(TransformImageArguments(corners: ImageCorners(), imageSize: imageSize, boundingSize: imageSize, intrinsicInsets: UIEdgeInsets()))()
        var imageFrame = CGRect(origin: CGPoint(x: floor((boundingSize.width - imageSize.width) / 2.0), y: textSize.height + textSpacing - topOffset), size: imageSize)
        var centerOffset: CGFloat = 0.0
        if self.item.file?.isPremiumSticker == true {
            let originalImageFrame = imageFrame
            imageFrame.origin.x = min(imageFrame.minX + imageFrame.width * 0.1, size.width - imageFrame.width - 18.0)
            centerOffset = imageFrame.minX - originalImageFrame.minX
        }
        self.imageNode.frame = imageFrame
        
        if let animationNode = self.animationNode {
            animationNode.frame = imageFrame
            animationNode.updateLayout(size: imageSize)
            
            if let additionalAnimationNode = self.additionalAnimationNode {
                additionalAnimationNode.frame = imageFrame.offsetBy(dx: -imageFrame.width * 0.245 + 21.0, dy: -1.0).insetBy(dx: -imageFrame.width * 0.245, dy: -imageFrame.height * 0.245)
                additionalAnimationNode.updateLayout(size: additionalAnimationNode.frame.size)
            }
        }
        
        if case let .portal(portalView) = self.item {
            self.portalWrapperNode.bounds = CGRect(origin: .zero, size: imageFrame.size)
            self.portalWrapperNode.position = imageFrame.center
            self.portalWrapperNode.cornerRadius = imageFrame.size.width / 8.0
            
            portalView.view.center = CGPoint(x: imageFrame.size.width / 2.0, y: imageFrame.size.height / 2.0)
            
            let scale = 180.0 / (size.width * 1.04)
            portalView.view.transform = CGAffineTransformMakeScale(scale, scale)
        }
        
        self.textNode.frame = CGRect(origin: CGPoint(x: floor((imageFrame.size.width - textSize.width) / 2.0) - centerOffset, y: -textSize.height - textSpacing), size: textSize)
        
        if self.item.file?.isCustomEmoji == true || textSize.height.isZero {
            return CGSize(width: boundingSize.width, height: imageFrame.height)
        } else {
            return CGSize(width: boundingSize.width, height: imageFrame.height + textSize.height + textSpacing)
        }
    }
}

final class PremiumStickerPackAccessoryNode: SparseNode, PeekControllerAccessoryNode {
    var dismiss: () -> Void = {}
    let proceed: () -> Void
    
    let textNode: ImmediateTextNode
    let proceedButton: SolidRoundedButtonNode
    let cancelButton: HighlightableButtonNode
    
    init(theme: PresentationTheme, strings: PresentationStrings, isEmoji: Bool, proceed: @escaping () -> Void) {
        self.proceed = proceed
        
        self.textNode = ImmediateTextNode()
        self.textNode.displaysAsynchronously = false
        self.textNode.textAlignment = .center
        self.textNode.maximumNumberOfLines = 0
        self.textNode.attributedText = NSAttributedString(string: isEmoji ? strings.Premium_Emoji_Description : strings.Premium_Stickers_Description, font: Font.regular(17.0), textColor: theme.actionSheet.secondaryTextColor)
        self.textNode.lineSpacing = 0.1
        
        self.proceedButton = SolidRoundedButtonNode(title: isEmoji ? strings.Premium_Emoji_Proceed: strings.Premium_Stickers_Proceed, theme: SolidRoundedButtonTheme(
            backgroundColor: .white,
            backgroundColors: [
            UIColor(rgb: 0x0077ff),
            UIColor(rgb: 0x6b93ff),
            UIColor(rgb: 0x8878ff),
            UIColor(rgb: 0xe46ace)
        ], foregroundColor: .white), height: 50.0, cornerRadius: 11.0, gloss: true)
        self.proceedButton.iconPosition = .right
        self.proceedButton.iconSpacing = 4.0
        self.proceedButton.animation = "premium_unlock"
        
        self.cancelButton = HighlightableButtonNode()
        self.cancelButton.setTitle(strings.Common_Cancel, with: Font.regular(17.0), with: theme.list.itemAccentColor, for: .normal)
        
        super.init()
        
        self.addSubnode(self.textNode)
        self.addSubnode(self.proceedButton)
        self.addSubnode(self.cancelButton)
        
        self.proceedButton.pressed = { [weak self] in
            self?.dismiss()
            self?.proceed()
        }
        self.cancelButton.addTarget(self, action: #selector(self.cancelPressed), forControlEvents: .touchUpInside)
    }
    
    @objc func cancelPressed() {
        self.dismiss()
    }
    
    func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) {
        let sideInset: CGFloat = 16.0
        
        var bottomOffset: CGFloat = 0.0
        if size.width == 320.0 {
            bottomOffset = 30.0
        } else if size.width == 375.0 && size.height == 667.0 {
            bottomOffset = 30.0
        }
        
        let cancelSize = self.cancelButton.measure(size)
        self.cancelButton.frame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - cancelSize.width) / 2.0), y: size.height - cancelSize.height - 49.0 + bottomOffset), size: cancelSize)
        
        let buttonWidth = size.width - sideInset * 2.0
        let buttonHeight = self.proceedButton.updateLayout(width: buttonWidth, transition: transition)
        self.proceedButton.frame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - buttonWidth) / 2.0), y: size.height - cancelSize.height - 49.0 - buttonHeight - 23.0 + bottomOffset), size: CGSize(width: buttonWidth, height: buttonHeight))
        
        let textSideInset = size.width == 320.0 ? sideInset : sideInset * 2.0
        
        let textSize = self.textNode.updateLayout(CGSize(width: size.width - textSideInset * 2.0, height: CGFloat.greatestFiniteMagnitude))
        self.textNode.frame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - textSize.width) / 2.0), y: size.height - cancelSize.height - 48.0 - buttonHeight - 20.0 - textSize.height - 31.0 + bottomOffset), size: textSize)
    }
}

private func topItems(selectedEmoji: [String] = [], recommendedEmoji: [String], count: Int) -> [String] {
    var defaultItems: [String] = [
        "👍", "👎", "❤", "🔥", "🥰", "👏", "😁", "😎"
    ]
    if !recommendedEmoji.isEmpty, let firstEmoji = recommendedEmoji.first {
        defaultItems.remove(at: defaultItems.count - 2)
        defaultItems.insert(firstEmoji, at: defaultItems.count - 1)
    }
    var result = selectedEmoji.filter { !defaultItems.contains($0) }
    result.append(contentsOf: defaultItems)
    return Array(result.prefix(count))
}

final class EmojiStickerAccessoryNode: SparseNode, PeekControllerAccessoryNode {
    let context: AccountContext
    
    let reactionContextNode: ReactionContextNode
    var selectedItemsDisposable: Disposable?
    
    var dismiss: () -> Void = {}
    
    private var scheduledCollapse = false
    
    init(context: AccountContext, theme: PresentationTheme, recommendedEmoji: [String], selectedEmoji: [String], selectedEmojiUpdated: @escaping ([String]) -> Void) {
        self.context = context
                
        var layoutImpl: ((ContainedViewLayoutTransition) -> Void)?
        
        let items = topItems(selectedEmoji: selectedEmoji, recommendedEmoji: recommendedEmoji, count: 7)
        let selectedItems = ValuePromise<[String]>(selectedEmoji)
        
        let presentationData = self.context.sharedContext.currentPresentationData.with({ $0 }).withUpdated(theme: defaultDarkPresentationTheme)
        let reactionContextNode = ReactionContextNode(
            context: self.context,
            animationCache: self.context.animationCache,
            presentationData: presentationData,
            items: items.map { .staticEmoji($0) },
            selectedItems: Set(selectedEmoji),
            title: presentationData.strings.MediaEditor_SetStickerEmoji,
            reactionsLocked: false,
            alwaysAllowPremiumReactions: true,
            allPresetReactionsAreAvailable: true,
            getEmojiContent: { animationCache, animationRenderer in
                return selectedItems.get()
                |> mapToSignal { selectedItems in
                    return EmojiPagerContentComponent.emojiInputData(
                        context: context,
                        animationCache: animationCache,
                        animationRenderer: animationRenderer,
                        isStandalone: false,
                        subject: .stickerAlt,
                        hasTrending: false,
                        topReactionItems: [],
                        topEmojiItems: topItems(selectedEmoji: selectedItems, recommendedEmoji: recommendedEmoji, count: 8),
                        areUnicodeEmojiEnabled: true,
                        areCustomEmojiEnabled: false,
                        chatPeerId: context.account.peerId,
                        selectedItems: Set(selectedItems),
                        hasRecent: false,
                        premiumIfSavedMessages: false
                    )
                }
            },
            isExpandedUpdated: { transition in
                layoutImpl?(transition)
            },
            requestLayout: { transition in
                layoutImpl?(transition)
            },
            requestUpdateOverlayWantsToBeBelowKeyboard: { transition in
                layoutImpl?(transition)
            }
        )
        reactionContextNode.hideBackground = true
        reactionContextNode.displayTail = true
        reactionContextNode.forceTailToRight = true
        reactionContextNode.forceDark = true
        reactionContextNode.isEmojiOnly = true
        self.reactionContextNode = reactionContextNode
                
        super.init()
        
        layoutImpl = { [weak self] transition in
            self?.requestLayout(forceUpdate: true, transition: transition)
        }
        
        reactionContextNode.emojiSelected = { [weak self] emoji in
            guard let self else {
                return
            }
            let _ = (selectedItems.get()
            |> take(1)
            |> deliverOnMainQueue).startStandalone(next: { [weak self] items in
                guard let self else {
                    return
                }
                var items = items
                if let index = items.firstIndex(where: { $0 == emoji }) {
                    items.remove(at: index)
                } else {
                    items.append(emoji)
                }
                selectedItems.set(items)
                selectedEmojiUpdated(items)
                
                self.reactionContextNode.collapse()
            })
        }
        
        self.addSubnode(reactionContextNode)
        
        self.selectedItemsDisposable = (selectedItems.get()
        |> deliverOnMainQueue).start(next: { [weak self] items in
            guard let self else {
                return
            }
            self.reactionContextNode.selectedItems = Set(items)
            self.reactionContextNode.items = topItems(selectedEmoji: items, recommendedEmoji: recommendedEmoji, count: 7).map { .staticEmoji($0) }
        })
    }
    
    deinit {
        self.selectedItemsDisposable?.dispose()
    }
        
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let result = super.hitTest(point, with: event)
        if let result, result.isDescendant(of: self.reactionContextNode.view) {
            return result
        } else if self.reactionContextNode.isExpanded {
            if !self.scheduledCollapse {
                self.scheduledCollapse = true
                Queue.mainQueue().after(0.01, {
                    self.scheduledCollapse = false
                    self.reactionContextNode.collapse()
                })
            }
            return self.reactionContextNode.view
        }
        return nil
    }
    
    func requestLayout(forceUpdate: Bool = false, transition: ContainedViewLayoutTransition) {
        guard let size = self.currentLayout else {
            return
        }
        self.updateLayout(size: size, forceUpdate: forceUpdate, transition: transition)
    }
    
    private var currentLayout: CGSize?
    func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) {
        self.updateLayout(size: size, forceUpdate: false, transition: transition)
    }
    func updateLayout(size: CGSize, forceUpdate: Bool, transition: ContainedViewLayoutTransition) {
        let isFirstTime = self.currentLayout == nil
        self.currentLayout = size
        
        let anchorRect = CGRect(x: size.width / 2.0, y: size.height / 3.0 - 50.0, width: 0.0, height: 0.0)
        
        transition.updateFrame(view: self.reactionContextNode.view, frame: CGRect(origin: CGPoint(), size: size))
        self.reactionContextNode.updateLayout(size: size, insets: UIEdgeInsets(top: 64.0, left: 0.0, bottom: 0.0, right: 0.0), anchorRect: anchorRect, centerAligned: true, isCoveredByInput: false, isAnimatingOut: false, forceUpdate: forceUpdate, transition: transition)
        
        if isFirstTime {
            Queue.mainQueue().justDispatch {
                self.reactionContextNode.animateIn(from: anchorRect)
            }
        }
    }
}