import Foundation
import AsyncDisplayKit
import Display
import Postbox
import TelegramCore
import SwiftSignalKit

final class PeerSelectionControllerNode: ASDisplayNode {
    private let account: Account
    private let dismiss: () -> Void
    
    let chatListNode: ChatListNode
    var navigationBar: NavigationBar?
    
    private var searchDisplayController: SearchDisplayController?
    
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    
    var requestDeactivateSearch: (() -> Void)?
    var requestOpenPeerFromSearch: ((Peer) -> Void)?
    var requestOpenMessageFromSearch: ((Peer, MessageId) -> Void)?
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    init(account: Account, dismiss: @escaping () -> Void) {
        self.account = account
        self.dismiss = dismiss
        
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        self.chatListNode = ChatListNode(account: account, mode: .peers, theme: presentationData.theme, strings: presentationData.strings)
        
        super.init()
        
        self.setViewBlock({
            return UITracingLayerView()
        })
        
        self.addSubnode(self.chatListNode)
        self.presentationDataDisposable = (account.telegramApplicationContext.presentationData
            |> deliverOnMainQueue).start(next: { [weak self] presentationData in
                if let strongSelf = self {
                    let previousTheme = strongSelf.presentationData.theme
                    let previousStrings = strongSelf.presentationData.strings
                    strongSelf.presentationData = presentationData
                    if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                        strongSelf.updateThemeAndStrings()
                    }
                }
            })
    }
    
    deinit {
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        self.searchDisplayController?.updateThemeAndStrings(theme: self.presentationData.theme, strings: self.presentationData.strings)
        self.chatListNode.updateThemeAndStrings(theme: self.presentationData.theme, strings: self.presentationData.strings)
    }
    
    func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        self.containerLayout = (layout, navigationBarHeight)
        
        var insets = layout.insets(options: [.input])
        insets.top += max(navigationBarHeight, layout.insets(options: [.statusBar]).top)
        
        self.chatListNode.bounds = CGRect(x: 0.0, y: 0.0, width: layout.size.width, height: layout.size.height)
        self.chatListNode.position = CGPoint(x: layout.size.width / 2.0, y: layout.size.height / 2.0)
        
        var duration: Double = 0.0
        var curve: UInt = 0
        switch transition {
        case .immediate:
            break
        case let .animated(animationDuration, animationCurve):
            duration = animationDuration
            switch animationCurve {
            case .easeInOut:
                break
            case .spring:
                curve = 7
            }
        }
        
        let listViewCurve: ListViewAnimationCurve
        var speedFactor: CGFloat = 1.0
        if curve == 7 {
            listViewCurve = .Spring(duration: duration)
        } else {
            listViewCurve = .Default
        }
        
        let updateSizeAndInsets = ListViewUpdateSizeAndInsets(size: layout.size, insets: insets, duration: duration, curve: listViewCurve)
        
        self.chatListNode.updateLayout(transition: transition, updateSizeAndInsets: updateSizeAndInsets)
        
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        }
    }
    
    func activateSearch() {
        guard let (containerLayout, navigationBarHeight) = self.containerLayout, let navigationBar = self.navigationBar else {
            return
        }
        
        var maybePlaceholderNode: SearchBarPlaceholderNode?
        self.chatListNode.forEachItemNode { node in
            if let node = node as? ChatListSearchItemNode {
                maybePlaceholderNode = node.searchBarNode
            }
        }
        
        if let _ = self.searchDisplayController {
            return
        }
        
        if let placeholderNode = maybePlaceholderNode {
            self.searchDisplayController = SearchDisplayController(theme: self.presentationData.theme, strings: self.presentationData.strings, contentNode: ChatListSearchContainerNode(account: self.account, openPeer: { [weak self] peer in
                if let requestOpenPeerFromSearch = self?.requestOpenPeerFromSearch {
                    requestOpenPeerFromSearch(peer)
                }
            }, openMessage: { [weak self] peer, messageId in
                if let requestOpenMessageFromSearch = self?.requestOpenMessageFromSearch {
                    requestOpenMessageFromSearch(peer, messageId)
                }
            }), cancel: { [weak self] in
                if let requestDeactivateSearch = self?.requestDeactivateSearch {
                    requestDeactivateSearch()
                }
            })
            
            self.searchDisplayController?.containerLayoutUpdated(containerLayout, navigationBarHeight: navigationBarHeight, transition: .immediate)
            self.searchDisplayController?.activate(insertSubnode: { subnode in
                self.insertSubnode(subnode, belowSubnode: navigationBar)
            }, placeholder: placeholderNode)
        }
    }
    
    func deactivateSearch() {
        if let searchDisplayController = self.searchDisplayController {
            var maybePlaceholderNode: SearchBarPlaceholderNode?
            self.chatListNode.forEachItemNode { node in
                if let node = node as? ChatListSearchItemNode {
                    maybePlaceholderNode = node.searchBarNode
                }
            }
            
            searchDisplayController.deactivate(placeholder: maybePlaceholderNode)
            self.searchDisplayController = nil
        }
    }
    
    func animateIn() {
        self.layer.animatePosition(from: CGPoint(x: self.layer.position.x, y: self.layer.position.y + self.layer.bounds.size.height), to: self.layer.position, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring, completion: { [weak self] _ in
        })
    }
    
    func animateOut(completion: (() -> Void)? = nil) {
        self.layer.animatePosition(from: self.layer.position, to: CGPoint(x: self.layer.position.x, y: self.layer.position.y + self.layer.bounds.size.height), duration: 0.2, timingFunction: kCAMediaTimingFunctionEaseInEaseOut, removeOnCompletion: false, completion: { [weak self] _ in
            if let strongSelf = self {
                strongSelf.dismiss()
            }
            completion?()
        })
    }
}