import Foundation
import UIKit
import Display
import TelegramCore
import SwiftSignalKit
import AsyncDisplayKit
import TelegramPresentationData
import TelegramStringFormatting
import SelectablePeerNode
import PeerPresenceStatusManager
import AccountContext
import ShimmerEffect

final class ShareControllerInteraction {
    var foundPeers: [EngineRenderedPeer] = []
    var selectedPeerIds = Set<EnginePeer.Id>()
    var selectedPeers: [EngineRenderedPeer] = []
    
    var selectedTopics: [EnginePeer.Id: (Int64, MessageHistoryThreadData)] = [:]
    
    let togglePeer: (EngineRenderedPeer, Bool) -> Void
    let selectTopic: (EngineRenderedPeer, Int64, MessageHistoryThreadData) -> Void

    init(togglePeer: @escaping (EngineRenderedPeer, Bool) -> Void, selectTopic: @escaping (EngineRenderedPeer, Int64, MessageHistoryThreadData) -> Void) {
        self.togglePeer = togglePeer
        self.selectTopic = selectTopic
    }
}

final class ShareControllerGridSection: GridSection {
    let height: CGFloat = 33.0
    
    private let title: String
    private let theme: PresentationTheme
    
    var hashValue: Int {
        return 1
    }
    
    init(title: String, theme: PresentationTheme) {
        self.title = title
        self.theme = theme
    }
    
    func isEqual(to: GridSection) -> Bool {
        if let to = to as? ShareControllerGridSection {
            return self.title == to.title && self.theme === to.theme
        } else {
            return false
        }
    }
    
    func node() -> ASDisplayNode {
        return ShareControllerGridSectionNode(title: self.title, theme: self.theme)
    }
}

private let sectionTitleFont = Font.bold(13.0)

final class ShareControllerGridSectionNode: ASDisplayNode {
    let backgroundNode: ASDisplayNode
    let titleNode: ASTextNode
    
    init(title: String, theme: PresentationTheme) {
        self.backgroundNode = ASDisplayNode()
        self.backgroundNode.isLayerBacked = true
        self.backgroundNode.backgroundColor = theme.chatList.sectionHeaderFillColor
        
        self.titleNode = ASTextNode()
        self.titleNode.isUserInteractionEnabled = false
        self.titleNode.attributedText = NSAttributedString(string: title.uppercased(), font: sectionTitleFont, textColor: theme.chatList.sectionHeaderTextColor)
        self.titleNode.maximumNumberOfLines = 1
        self.titleNode.truncationMode = .byTruncatingTail
        
        super.init()
        
        self.addSubnode(self.backgroundNode)
        self.addSubnode(self.titleNode)
    }
    
    override func layout() {
        super.layout()
        
        let bounds = self.bounds
        
        self.backgroundNode.frame = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: CGSize(width: bounds.size.width, height: 27.0))
        
        let titleSize = self.titleNode.measure(CGSize(width: bounds.size.width - 24.0, height: CGFloat.greatestFiniteMagnitude))
        self.titleNode.frame = CGRect(origin: CGPoint(x: 16.0, y: 6.0 + UIScreenPixel), size: titleSize)
    }
}

final class ShareControllerPeerGridItem: GridItem {
    let environment: ShareControllerEnvironment
    let context: ShareControllerAccountContext
    let theme: PresentationTheme
    let strings: PresentationStrings
    let peer: EngineRenderedPeer?
    let presence: EnginePeer.Presence?
    let topicId: Int64?
    let threadData: MessageHistoryThreadData?
    let controllerInteraction: ShareControllerInteraction
    let search: Bool
    
    let section: GridSection?
    
    init(environment: ShareControllerEnvironment, context: ShareControllerAccountContext, theme: PresentationTheme, strings: PresentationStrings, peer: EngineRenderedPeer?, presence: EnginePeer.Presence?, topicId: Int64?, threadData: MessageHistoryThreadData?, controllerInteraction: ShareControllerInteraction, sectionTitle: String? = nil, search: Bool = false) {
        self.environment = environment
        self.context = context
        self.theme = theme
        self.strings = strings
        self.peer = peer
        self.presence = presence
        self.topicId = topicId
        self.threadData = threadData
        self.controllerInteraction = controllerInteraction
        self.search = search
        
        if let sectionTitle = sectionTitle {
            self.section = ShareControllerGridSection(title: sectionTitle, theme: self.theme)
        } else {
            self.section = nil
        }
    }
    
    func node(layout: GridNodeLayout, synchronousLoad: Bool) -> GridItemNode {
        let node = ShareControllerPeerGridItemNode()
        node.controllerInteraction = self.controllerInteraction
        node.setup(environment: self.environment, context: self.context, theme: self.theme, strings: self.strings, peer: self.peer, presence: self.presence, topicId: self.topicId, threadData: self.threadData, search: self.search, synchronousLoad: synchronousLoad, force: false)
        return node
    }
    
    func update(node: GridItemNode) {
        guard let node = node as? ShareControllerPeerGridItemNode else {
            assertionFailure()
            return
        }
        node.controllerInteraction = self.controllerInteraction
        node.setup(environment: self.environment, context: self.context, theme: self.theme, strings: self.strings, peer: self.peer, presence: self.presence, topicId: self.topicId, threadData: self.threadData, search: self.search, synchronousLoad: false, force: false)
    }
}

final class ShareControllerPeerGridItemNode: GridItemNode {
    private var currentState: (ShareControllerEnvironment, ShareControllerAccountContext, PresentationTheme, PresentationStrings, EngineRenderedPeer?, Bool, EnginePeer.Presence?, Int64?, MessageHistoryThreadData?)?
    private let peerNode: SelectablePeerNode
    private var presenceManager: PeerPresenceStatusManager?
    
    var controllerInteraction: ShareControllerInteraction?
    
    private var placeholderNode: ShimmerEffectNode?
    private var absoluteLocation: (CGRect, CGSize)?
    
    var peerId: EnginePeer.Id? {
        return self.currentState?.4?.peerId
    }
    
    override init() {
        self.peerNode = SelectablePeerNode()
        
        super.init()
        
        self.peerNode.toggleSelection = { [weak self] in
            if let strongSelf = self {
                if let (_, _, _, _, maybePeer, search, _, _, _) = strongSelf.currentState, let peer = maybePeer {
                    if let _ = peer.peers[peer.peerId] {
                        strongSelf.controllerInteraction?.togglePeer(peer, search)
                    }
                }
            }
        }
        self.addSubnode(self.peerNode)
        self.presenceManager = PeerPresenceStatusManager(update: { [weak self] in
            guard let strongSelf = self, let currentState = strongSelf.currentState else {
                return
            }
            strongSelf.setup(environment: currentState.0, context: currentState.1, theme: currentState.2, strings: currentState.3, peer: currentState.4, presence: currentState.6, topicId: currentState.7, threadData: currentState.8, search: currentState.5, synchronousLoad: false, force: true)
        })
    }
    
    override func updateAbsoluteRect(_ absoluteRect: CGRect, within containerSize: CGSize) {
        let rect = absoluteRect
        self.absoluteLocation = (rect, containerSize)
        if let shimmerNode = self.placeholderNode {
            shimmerNode.updateAbsoluteRect(rect, within: containerSize)
        }
    }
    
    func setup(environment: ShareControllerEnvironment, context: ShareControllerAccountContext, theme: PresentationTheme, strings: PresentationStrings, peer: EngineRenderedPeer?, presence: EnginePeer.Presence?, topicId: Int64?, threadData: MessageHistoryThreadData?, search: Bool, synchronousLoad: Bool, force: Bool) {
        if force || self.currentState == nil || self.currentState!.1 !== context || self.currentState!.3 !== theme || self.currentState!.4 != peer || self.currentState!.6 != presence || self.currentState!.7 != topicId {
            let itemTheme = SelectablePeerNodeTheme(textColor: theme.actionSheet.primaryTextColor, secretTextColor: theme.chatList.secretTitleColor, selectedTextColor: theme.actionSheet.controlAccentColor, checkBackgroundColor: theme.actionSheet.opaqueItemBackgroundColor, checkFillColor: theme.actionSheet.controlAccentColor, checkColor: theme.actionSheet.checkContentColor, avatarPlaceholderColor: theme.list.mediaPlaceholderColor)
            
            let timestamp = Int32(CFAbsoluteTimeGetCurrent() + NSTimeIntervalSince1970)
            var online = false
            if case let .user(peer) = peer?.peer, let presence = presence, !isServicePeer(peer) && !peer.flags.contains(.isSupport) && peer.id != context.accountPeerId  {
                let relativeStatus = relativeUserPresenceStatus(presence, relativeTo: timestamp)
                if case .online = relativeStatus {
                    online = true
                }
            }
            
            self.peerNode.theme = itemTheme
            if let peer = peer {
                let resolveInlineStickers = context.resolveInlineStickers
                self.peerNode.setup(
                    accountPeerId: context.accountPeerId,
                    postbox: context.stateManager.postbox,
                    network: context.stateManager.network,
                    energyUsageSettings: environment.energyUsageSettings,
                    contentSettings: context.contentSettings,
                    animationCache: context.animationCache,
                    animationRenderer: context.animationRenderer,
                    resolveInlineStickers: { fileIds in
                        return resolveInlineStickers(fileIds)
                    },
                    theme: theme,
                    strings: strings,
                    peer: peer,
                    customTitle: threadData?.info.title,
                    iconId: threadData?.info.icon,
                    iconColor: threadData?.info.iconColor ?? 0,
                    online: online,
                    synchronousLoad: synchronousLoad
                )
                if let shimmerNode = self.placeholderNode {
                    self.placeholderNode = nil
                    shimmerNode.removeFromSupernode()
                }
            } else {
                let shimmerNode: ShimmerEffectNode
                if let current = self.placeholderNode {
                    shimmerNode = current
                } else {
                    shimmerNode = ShimmerEffectNode()
                    self.placeholderNode = shimmerNode
                    self.addSubnode(shimmerNode)
                }
                shimmerNode.frame = self.bounds
                if let (rect, size) = self.absoluteLocation {
                    shimmerNode.updateAbsoluteRect(rect, within: size)
                }
                
                var shapes: [ShimmerEffectNode.Shape] = []
                
                let titleLineWidth: CGFloat = 56.0
                let lineDiameter: CGFloat = 10.0
                
                let iconFrame = CGRect(x: 13.0, y: 4.0, width: 60.0, height: 60.0)
                shapes.append(.circle(iconFrame))
                
                let titleFrame = CGRect(x: 15.0, y: 70.0, width: 56.0, height: 10.0)
                shapes.append(.roundedRectLine(startPoint: CGPoint(x: titleFrame.minX, y: titleFrame.minY + floor((titleFrame.height - lineDiameter) / 2.0)), width: titleLineWidth, diameter: lineDiameter))
                
                shimmerNode.update(backgroundColor: theme.list.itemBlocksBackgroundColor, foregroundColor: theme.list.mediaPlaceholderColor, shimmeringColor: theme.list.itemBlocksBackgroundColor.withAlphaComponent(0.4), shapes: shapes, horizontal: true, size: self.bounds.size)
            }
            self.currentState = (environment, context, theme, strings, peer, search, presence, topicId, threadData)
            self.setNeedsLayout()
            if let presence = presence {
                self.presenceManager?.reset(presence: presence)
            }
        }
        self.updateSelection(animated: false)
    }
    
    func updateSelection(animated: Bool) {
        var selected = false
        if let controllerInteraction = self.controllerInteraction, let (_, _, _, _, maybePeer, _, _, _, _) = self.currentState, let peer = maybePeer {
            selected = controllerInteraction.selectedPeerIds.contains(peer.peerId)
        }
        
        self.peerNode.updateSelection(selected: selected, animated: animated)
    }
    
    override func layout() {
        super.layout()
        
        let bounds = self.bounds
        self.peerNode.frame = bounds
        self.placeholderNode?.frame = bounds
        
        if let (_, _, theme, _, _, _, _, _, _) = self.currentState, let shimmerNode = self.placeholderNode {
            var shapes: [ShimmerEffectNode.Shape] = []
            
            let titleLineWidth: CGFloat = 56.0
            let lineDiameter: CGFloat = 10.0
            
            let iconFrame = CGRect(x: (bounds.width - 60.0) / 2.0, y: 4.0, width: 60.0, height: 60.0)
            shapes.append(.circle(iconFrame))
            
            let titleFrame = CGRect(x: (bounds.width - titleLineWidth) / 2.0, y: 70.0, width: titleLineWidth, height: 10.0)
            shapes.append(.roundedRectLine(startPoint: CGPoint(x: titleFrame.minX, y: titleFrame.minY + floor((titleFrame.height - lineDiameter) / 2.0)), width: titleLineWidth, diameter: lineDiameter))
            
            shimmerNode.update(backgroundColor: theme.list.itemBlocksBackgroundColor, foregroundColor: theme.list.mediaPlaceholderColor, shimmeringColor: theme.list.itemBlocksBackgroundColor.withAlphaComponent(0.4), shapes: shapes, horizontal: true, size: self.bounds.size)
        }
    }
}