import Display
import AsyncDisplayKit
import UIKit
import Postbox
import TelegramCore
import SwiftSignalKit

final class ContactsControllerNode: ASDisplayNode {
    let contactListNode: ContactListNode
    
    private let account: Account
    private var searchDisplayController: SearchDisplayController?
    
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    
    var navigationBar: NavigationBar?
    
    var requestDeactivateSearch: (() -> Void)?
    var requestOpenPeerFromSearch: ((ContactListPeer) -> Void)?
    var openInvite: (() -> Void)?
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    init(account: Account, present: @escaping (ViewController, Any?) -> Void) {
        self.account = account
        
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        var inviteImpl: (() -> Void)?
        self.contactListNode = ContactListNode(account: account, presentation: .orderedByPresence(options: [ContactListAdditionalOption(title: presentationData.strings.Contacts_InviteFriends, icon: generateTintedImage(image: UIImage(bundleImageName: "Contact List/AddMemberIcon"), color: self.presentationData.theme.list.itemAccentColor), action: {
            inviteImpl?()
        })]))
        
        super.init()
        
        self.setViewBlock({
            return UITracingLayerView()
        })
        
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.addSubnode(self.contactListNode)
        
        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()
                    }
                }
            })
        
        inviteImpl = { [weak self] in
            let _ = (DeviceAccess.contacts
            |> take(1)
            |> deliverOnMainQueue).start(next: { value in
                guard let strongSelf = self else {
                    return
                }
                
                if let value = value, value {
                    strongSelf.openInvite?()
                } else {
                    let presentationData = strongSelf.presentationData
                    present(standardTextAlertController(theme: AlertControllerTheme(presentationTheme: presentationData.theme), title: presentationData.strings.AccessDenied_Title, text: presentationData.strings.Contacts_AccessDeniedError, actions: [TextAlertAction(type: .defaultAction, title: presentationData.strings.Common_NotNow, action: {}), TextAlertAction(type: .genericAction, title: presentationData.strings.AccessDenied_Settings, action: {
                        self?.account.telegramApplicationContext.applicationBindings.openSettings()
                    })]), nil)
                }
            })
        }
    }
    
    deinit {
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.searchDisplayController?.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 += navigationBarHeight
        
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
            if !searchDisplayController.isDeactivating {
                insets.top += layout.statusBarHeight ?? 0.0
            }
        }
        
        self.contactListNode.containerLayoutUpdated(ContainerViewLayout(size: layout.size, metrics: layout.metrics, intrinsicInsets: insets, safeInsets: layout.safeInsets, statusBarHeight: layout.statusBarHeight, inputHeight: layout.inputHeight, standardInputHeight: layout.standardInputHeight, inputHeightIsInteractivellyChanging: layout.inputHeightIsInteractivellyChanging), transition: transition)
        
        self.contactListNode.frame = CGRect(origin: CGPoint(), size: layout.size)
    }
    
    func activateSearch() {
        guard let (containerLayout, navigationBarHeight) = self.containerLayout, let navigationBar = self.navigationBar else {
            return
        }
        
        var maybePlaceholderNode: SearchBarPlaceholderNode?
        self.contactListNode.listNode.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: ContactsSearchContainerNode(account: self.account, onlyWriteable: false, categories: [.cloudContacts, .global, .deviceContacts], openPeer: { [weak self] peer in
                if let requestOpenPeerFromSearch = self?.requestOpenPeerFromSearch {
                    requestOpenPeerFromSearch(peer)
                }
            }), 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 {
            self.searchDisplayController = nil
            var maybePlaceholderNode: SearchBarPlaceholderNode?
            self.contactListNode.listNode.forEachItemNode { node in
                if let node = node as? ChatListSearchItemNode {
                    maybePlaceholderNode = node.searchBarNode
                }
            }
            
            searchDisplayController.deactivate(placeholder: maybePlaceholderNode)
        }
    }
}