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 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 createActionDisposable = MetaDisposable()
    
    public init(account: Account, title: String) {
        self.account = account
        
        super.init()
        
        self.title = title
        
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: nil, action: nil)
        
        self.scrollToTop = { [weak self] in
            if let strongSelf = self {
                strongSelf.contactsNode.contactListNode.scrollToTop()
            }
        }
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.createActionDisposable.dispose()
    }
    
    @objc func cancelPressed() {
        self._result.set(.single(nil))
        self.contactsNode.animateOut()
    }
    
    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.contactsNode.deactivateSearch()
            self.setDisplayNavigationBar(true, transition: .animated(duration: 0.5, curve: .spring))
        }
    }
    
    private func openPeer(peerId: PeerId) {
        self._result.set(.single(peerId))
        self.contactsNode.animateOut()
    }
}