import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import TelegramCore
import Postbox
import TelegramPresentationData
import ProgressNavigationButtonNode
import AccountContext
import CountrySelectionUI
import SettingsUI
import PhoneNumberFormat
import DebugSettingsUI

final class AuthorizationSequencePhoneEntryController: ViewController {
    private var controllerNode: AuthorizationSequencePhoneEntryControllerNode {
        return self.displayNode as! AuthorizationSequencePhoneEntryControllerNode
    }
    
    private let sharedContext: SharedAccountContext
    private var account: UnauthorizedAccount
    private let isTestingEnvironment: Bool
    private let otherAccountPhoneNumbers: ((String, AccountRecordId, Bool)?, [(String, AccountRecordId, Bool)])
    private let network: Network
    private let presentationData: PresentationData
    private let openUrl: (String) -> Void
    
    private let back: () -> Void
    
    private var currentData: (Int32, String?, String)?
    
    var inProgress: Bool = false {
        didSet {
            if self.inProgress {
                let item = UIBarButtonItem(customDisplayNode: ProgressNavigationButtonNode(color: self.presentationData.theme.rootController.navigationBar.accentTextColor))
                self.navigationItem.rightBarButtonItem = item
            } else {
                self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: self.presentationData.strings.Common_Next, style: .done, target: self, action: #selector(self.nextPressed))
            }
            self.controllerNode.inProgress = self.inProgress
        }
    }
    var loginWithNumber: ((String, Bool) -> Void)?
    var accountUpdated: ((UnauthorizedAccount) -> Void)?
    
    private let termsDisposable = MetaDisposable()
    
    private let hapticFeedback = HapticFeedback()
    
    init(sharedContext: SharedAccountContext, account: UnauthorizedAccount, isTestingEnvironment: Bool, otherAccountPhoneNumbers: ((String, AccountRecordId, Bool)?, [(String, AccountRecordId, Bool)]), network: Network, presentationData: PresentationData, openUrl: @escaping (String) -> Void, back: @escaping () -> Void) {
        self.sharedContext = sharedContext
        self.account = account
        self.isTestingEnvironment = isTestingEnvironment
        self.otherAccountPhoneNumbers = otherAccountPhoneNumbers
        self.network = network
        self.presentationData = presentationData
        self.openUrl = openUrl
        self.back = back
                
        super.init(navigationBarPresentationData: NavigationBarPresentationData(theme: AuthorizationSequenceController.navigationBarTheme(presentationData.theme), strings: NavigationBarStrings(presentationStrings: presentationData.strings)))
        
        self.supportedOrientations = ViewControllerSupportedOrientations(regularSize: .all, compactSize: .portrait)
        
        self.hasActiveInput = true
        
        self.statusBar.statusBarStyle = presentationData.theme.intro.statusBarStyle.style
        self.attemptNavigation = { _ in
            return false
        }
        self.navigationBar?.backPressed = {
            back()
        }
        
        if !otherAccountPhoneNumbers.1.isEmpty {
            self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: presentationData.strings.Common_Cancel, style: .plain, target: self, action: #selector(self.cancelPressed))
        }
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: presentationData.strings.Common_Next, style: .done, target: self, action: #selector(self.nextPressed))
    }
    
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.termsDisposable.dispose()
    }
    
    @objc private func cancelPressed() {
        self.back()
    }
    
    func updateData(countryCode: Int32, countryName: String?, number: String) {
        self.currentData = (countryCode, countryName, number)
        if self.isNodeLoaded {
            self.controllerNode.codeAndNumber = (countryCode, countryName, number)
        }
    }
    
    override public func loadDisplayNode() {
        self.displayNode = AuthorizationSequencePhoneEntryControllerNode(sharedContext: self.sharedContext, account: self.account, strings: self.presentationData.strings, theme: self.presentationData.theme, debugAction: { [weak self] in
            guard let strongSelf = self else {
                return
            }
            strongSelf.view.endEditing(true)
            self?.present(debugController(sharedContext: strongSelf.sharedContext, context: nil, modal: true), in: .window(.root), with: ViewControllerPresentationArguments(presentationAnimation: .modalSheet))
        }, hasOtherAccounts: self.otherAccountPhoneNumbers.0 != nil)
        self.controllerNode.accountUpdated = { [weak self] account in
            guard let strongSelf = self else {
                return
            }
            strongSelf.account = account
            strongSelf.accountUpdated?(account)
        }
        
        if let (code, name, number) = self.currentData {
            self.controllerNode.codeAndNumber = (code, name, number)
        }
        self.displayNodeDidLoad()
        
        self.controllerNode.view.disableAutomaticKeyboardHandling = [.forward, .backward]
        
        self.controllerNode.selectCountryCode = { [weak self] in
            if let strongSelf = self {
                let controller = AuthorizationSequenceCountrySelectionController(strings: strongSelf.presentationData.strings, theme: strongSelf.presentationData.theme)
                controller.completeWithCountryCode = { code, name in
                    if let strongSelf = self, let currentData = strongSelf.currentData {
                        strongSelf.updateData(countryCode: Int32(code), countryName: name, number: currentData.2)
                        strongSelf.controllerNode.activateInput()
                    }
                }
                controller.dismissed = {
                    self?.controllerNode.activateInput()
                }
                strongSelf.push(controller)
            }
        }
        self.controllerNode.checkPhone = { [weak self] in
            self?.nextPressed()
        }
        
        loadServerCountryCodes(accountManager: sharedContext.accountManager, engine: TelegramEngineUnauthorized(account: self.account), completion: { [weak self] in
            if let strongSelf = self {
                strongSelf.controllerNode.updateCountryCode()
            }
        })
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        self.controllerNode.activateInput()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        self.controllerNode.activateInput()
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.controllerNode.containerLayoutUpdated(layout, navigationBarHeight: self.navigationLayout(layout: layout).navigationFrame.maxY, transition: transition)
    }
    
    @objc func nextPressed() {
        let (_, _, number) = self.controllerNode.codeAndNumber
        if !number.isEmpty {
            let logInNumber = formatPhoneNumber(self.controllerNode.currentNumber)
            var existing: (String, AccountRecordId)?
            for (number, id, isTestingEnvironment) in self.otherAccountPhoneNumbers.1 {
                if isTestingEnvironment == self.isTestingEnvironment && formatPhoneNumber(number) == logInNumber {
                    existing = (number, id)
                }
            }
            
            if let (_, id) = existing {
                var actions: [TextAlertAction] = []
                if let (current, _, _) = self.otherAccountPhoneNumbers.0, logInNumber != formatPhoneNumber(current) {
                    actions.append(TextAlertAction(type: .genericAction, title: self.presentationData.strings.Login_PhoneNumberAlreadyAuthorizedSwitch, action: { [weak self] in
                        self?.sharedContext.switchToAccount(id: id, fromSettingsController: nil, withChatListController: nil)
                        self?.back()
                    }))
                }
                actions.append(TextAlertAction(type: .defaultAction, title: self.presentationData.strings.Common_OK, action: {}))
                self.present(standardTextAlertController(theme: AlertControllerTheme(presentationData: self.presentationData), title: nil, text: self.presentationData.strings.Login_PhoneNumberAlreadyAuthorized, actions: actions), in: .window(.root))
            } else {
                self.loginWithNumber?(self.controllerNode.currentNumber, self.controllerNode.syncContacts)
            }
        } else {
            self.hapticFeedback.error()
            self.controllerNode.animateError()
        }
    }
}