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

public class ContactSelectionController: ViewController {
    private let account: Account
    
    private var contactsNode: ContactSelectionControllerNode {
        return self.displayNode as! ContactSelectionControllerNode
    }
    
    private let index: PeerNameIndex = .lastNameFirst
    private let titleProducer: (PresentationStrings) -> String
    
    private var _ready = Promise<Bool>()
    override public var ready: Promise<Bool> {
        return self._ready
    }
    
    private let _result = Promise<PeerId?>()
    var result: Signal<PeerId?, NoError> {
        return self._result.get()
    }
    
    private let confirmation: (PeerId) -> Signal<Bool, NoError>
    
    private let createActionDisposable = MetaDisposable()
    private let confirmationDisposable = MetaDisposable()
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    public var displayNavigationActivity: Bool = false {
        didSet {
            if self.displayNavigationActivity != oldValue {
                if self.displayNavigationActivity {
                    self.navigationItem.setRightBarButton(UIBarButtonItem(customDisplayNode: ProgressNavigationButtonNode()), animated: false)
                } else {
                    self.navigationItem.setRightBarButton(nil, animated: false)
                }
            }
        }
    }
    
    public init(account: Account, title: @escaping (PresentationStrings) -> String, confirmation: @escaping (PeerId) -> Signal<Bool, NoError> = { _ in .single(true) }) {
        self.account = account
        self.titleProducer = title
        self.confirmation = confirmation
        
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        super.init(navigationBarTheme: NavigationBarTheme(rootControllerTheme: self.presentationData.theme))
        
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        
        self.title = self.titleProducer(self.presentationData.strings)
        
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: self.presentationData.strings.Common_Back, style: .plain, target: nil, action: nil)
        
        self.scrollToTop = { [weak self] in
            if let strongSelf = self {
                strongSelf.contactsNode.contactListNode.scrollToTop()
            }
        }
        
        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()
                    }
                }
            })
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.createActionDisposable.dispose()
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        self.navigationBar?.updateTheme(NavigationBarTheme(rootControllerTheme: self.presentationData.theme))
        self.title = self.titleProducer(self.presentationData.strings)
        self.tabBarItem.title = self.presentationData.strings.Contacts_Title
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: self.presentationData.strings.Common_Back, style: .plain, target: nil, action: nil)
    }
    
    @objc func cancelPressed() {
        self._result.set(.single(nil))
        
        if let presentationArguments = self.presentationArguments as? ViewControllerPresentationArguments {
            switch presentationArguments.presentationAnimation {
                case .modalSheet:
                    self.contactsNode.animateOut()
                case .none:
                    break
            }
        }
    }
    
    override public func loadDisplayNode() {
        self.displayNode = ContactSelectionControllerNode(account: self.account)
        self._ready.set(self.contactsNode.contactListNode.ready)
        
        self.contactsNode.navigationBar = self.navigationBar
        
        self.contactsNode.requestDeactivateSearch = { [weak self] in
            self?.deactivateSearch()
        }
        
        self.contactsNode.requestOpenPeerFromSearch = { [weak self] peerId in
            self?.openPeer(peerId: peerId)
        }
        
        self.contactsNode.contactListNode.activateSearch = { [weak self] in
            self?.activateSearch()
        }
        
        self.contactsNode.contactListNode.openPeer = { [weak self] peer in
            self?.openPeer(peerId: peer.id)
        }
        
        self.contactsNode.dismiss = { [weak self] in
            self?.presentingViewController?.dismiss(animated: true, completion: nil)
        }
        
        self.displayNodeDidLoad()
    }
    
    override public func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if let presentationArguments = self.presentationArguments as? ViewControllerPresentationArguments {
            switch presentationArguments.presentationAnimation {
                case .modalSheet:
                    self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelPressed))
                case .none:
                    break
            }
        }
        
        self.contactsNode.contactListNode.enableUpdates = true
    }
    
    override public func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if let presentationArguments = self.presentationArguments as? ViewControllerPresentationArguments {
            switch presentationArguments.presentationAnimation {
                case .modalSheet:
                    self.contactsNode.animateIn()
                case .none:
                    break
            }
        }
    }
    
    override public func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        
        self.contactsNode.contactListNode.enableUpdates = false
    }
    
    override public func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.contactsNode.containerLayoutUpdated(layout, navigationBarHeight: self.navigationHeight, transition: transition)
    }
    
    private func activateSearch() {
        if self.displayNavigationBar {
            if let scrollToTop = self.scrollToTop {
                scrollToTop()
            }
            self.contactsNode.activateSearch()
            self.setDisplayNavigationBar(false, transition: .animated(duration: 0.5, curve: .spring))
        }
    }
    
    private func deactivateSearch() {
        if !self.displayNavigationBar {
            self.setDisplayNavigationBar(true, transition: .animated(duration: 0.5, curve: .spring))
            self.contactsNode.deactivateSearch()
        }
    }
    
    private func openPeer(peerId: PeerId) {
        self.contactsNode.contactListNode.listNode.clearHighlightAnimated(true)
        self.confirmationDisposable.set((self.confirmation(peerId) |> deliverOnMainQueue).start(next: { [weak self] value in
            if let strongSelf = self {
                if value {
                    strongSelf._result.set(.single(peerId))
                    strongSelf.dismiss()
                }
            }
        }))
    }
    
    override open func dismiss(completion: (() -> Void)? = nil) {
        if let presentationArguments = self.presentationArguments as? ViewControllerPresentationArguments {
            switch presentationArguments.presentationAnimation {
                case .modalSheet:
                    self.contactsNode.animateOut(completion: completion)
                case .none:
                    completion?()
            }
        }
    }
    
    public func dismissSearch() {
        self.deactivateSearch()
    }
}