import UIKit
import Display
import TelegramCore
import SyncCore
import SwiftSignalKit
import Postbox
import TelegramPresentationData
import TelegramUIPreferences
import AccountContext
import ShareController
import LegacyUI
import PeerInfoUI
import ShareItems
import ShareItemsImpl
import SettingsUI
import OpenSSLEncryptionProvider
import AppLock
import Intents

private let inForeground = ValuePromise<Bool>(false, ignoreRepeated: true)

private final class InternalContext {
    let sharedContext: SharedAccountContextImpl
    let wakeupManager: SharedWakeupManager
    
    init(sharedContext: SharedAccountContextImpl) {
        self.sharedContext = sharedContext
        self.wakeupManager = SharedWakeupManager(beginBackgroundTask: { _, _ in nil }, endBackgroundTask: { _ in }, backgroundTimeRemaining: { 0.0 }, activeAccounts: sharedContext.activeAccounts |> map { ($0.0, $0.1.map { ($0.0, $0.1) }) }, liveLocationPolling: .single(nil), watchTasks: .single(nil), inForeground: inForeground.get(), hasActiveAudioSession: .single(false), notificationManager: nil, mediaManager: sharedContext.mediaManager, callManager: sharedContext.callManager, accountUserInterfaceInUse: { id in
            return sharedContext.accountUserInterfaceInUse(id)
        })
    }
}

private var globalInternalContext: InternalContext?

private var installedSharedLogger = false

private func setupSharedLogger(rootPath: String, path: String) {
    if !installedSharedLogger {
        installedSharedLogger = true
        Logger.setSharedLogger(Logger(rootPath: rootPath, basePath: path))
    }
}

private enum ShareAuthorizationError {
    case unauthorized
}

public struct ShareRootControllerInitializationData {
    public let appGroupPath: String
    public let apiId: Int32
    public let apiHash: String
    public let languagesCategory: String
    public let encryptionParameters: (Data, Data)
    public let appVersion: String
    public let bundleData: Data?
    
    public init(appGroupPath: String, apiId: Int32, apiHash: String, languagesCategory: String, encryptionParameters: (Data, Data), appVersion: String, bundleData: Data?) {
        self.appGroupPath = appGroupPath
        self.apiId = apiId
        self.apiHash = apiHash
        self.languagesCategory = languagesCategory
        self.encryptionParameters = encryptionParameters
        self.appVersion = appVersion
        self.bundleData = bundleData
    }
}

public class ShareRootControllerImpl {
    private let initializationData: ShareRootControllerInitializationData
    private let getExtensionContext: () -> NSExtensionContext?
    
    private var mainWindow: Window1?
    private var currentShareController: ShareController?
    private var currentPasscodeController: ViewController?
    
    private var shouldBeMaster = Promise<Bool>()
    private let disposable = MetaDisposable()
    private var observer1: AnyObject?
    private var observer2: AnyObject?
    
    public init(initializationData: ShareRootControllerInitializationData, getExtensionContext: @escaping () -> NSExtensionContext?) {
        self.initializationData = initializationData
        self.getExtensionContext = getExtensionContext
    }
    
    deinit {
        self.disposable.dispose()
        self.shouldBeMaster.set(.single(false))
        if let observer = self.observer1 {
            NotificationCenter.default.removeObserver(observer)
        }
        if let observer = self.observer2 {
            NotificationCenter.default.removeObserver(observer)
        }
    }
    
    public func loadView() {
        telegramUIDeclareEncodables()
        
        if #available(iOSApplicationExtension 8.2, iOS 8.2, *) {
            self.observer1 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSExtensionHostDidBecomeActive, object: nil, queue: nil, using: { _ in
                inForeground.set(true)
            })
            
            self.observer2 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSExtensionHostWillResignActive, object: nil, queue: nil, using: { _ in
                inForeground.set(false)
            })
        }
    }
    
    public func viewWillAppear() {
        inForeground.set(true)
    }
    
    public func viewWillDisappear() {
        self.disposable.dispose()
        inForeground.set(false)
    }
    
    public func viewDidLayoutSubviews(view: UIView, traitCollection: UITraitCollection) {
        if self.mainWindow == nil {
            let mainWindow = Window1(hostView: childWindowHostView(parent: view), statusBarHost: nil)
            mainWindow.hostView.eventView.backgroundColor = UIColor.clear
            mainWindow.hostView.eventView.isHidden = false
            self.mainWindow = mainWindow
            
            let bounds = view.bounds
            
            view.addSubview(mainWindow.hostView.containerView)
            mainWindow.hostView.containerView.frame = bounds
            
            let rootPath = rootPathForBasePath(self.initializationData.appGroupPath)
            performAppGroupUpgrades(appGroupPath: self.initializationData.appGroupPath, rootPath: rootPath)
            
            TempBox.initializeShared(basePath: rootPath, processType: "share", launchSpecificId: arc4random64())
            
            let logsPath = rootPath + "/share-logs"
            let _ = try? FileManager.default.createDirectory(atPath: logsPath, withIntermediateDirectories: true, attributes: nil)
            
            setupSharedLogger(rootPath: rootPath, path: logsPath)
            
            let applicationBindings = TelegramApplicationBindings(isMainApp: false, containerPath: self.initializationData.appGroupPath, appSpecificScheme: "tg", openUrl: { _ in
            }, openUniversalUrl: { _, completion in
                completion.completion(false)
                return
            }, canOpenUrl: { _ in
                return false
            }, getTopWindow: {
                return nil
            }, displayNotification: { _ in
                
            }, applicationInForeground: .single(false), applicationIsActive: .single(false), clearMessageNotifications: { _ in
            }, pushIdleTimerExtension: {
                return EmptyDisposable
            }, openSettings: {}, openAppStorePage: {}, registerForNotifications: { _ in }, requestSiriAuthorization: { _ in }, siriAuthorization: { return .notDetermined }, getWindowHost: {
                return nil
            }, presentNativeController: { _ in
            }, dismissNativeController: {
            }, getAvailableAlternateIcons: {
                return []
            }, getAlternateIconName: {
                return nil
            }, requestSetAlternateIconName: { _, f in
                f(false)
            })
            
            let internalContext: InternalContext
            
            let accountManager = AccountManager(basePath: rootPath + "/accounts-metadata")
            
            if let globalInternalContext = globalInternalContext {
                internalContext = globalInternalContext
            } else {
                initializeAccountManagement()
                var initialPresentationDataAndSettings: InitialPresentationDataAndSettings?
                let semaphore = DispatchSemaphore(value: 0)
                let systemUserInterfaceStyle: WindowUserInterfaceStyle
                if #available(iOSApplicationExtension 12.0, iOS 12.0, *) {
                    systemUserInterfaceStyle = WindowUserInterfaceStyle(style: traitCollection.userInterfaceStyle)
                } else {
                    systemUserInterfaceStyle = .light
                }
                let _ = currentPresentationDataAndSettings(accountManager: accountManager, systemUserInterfaceStyle: systemUserInterfaceStyle).start(next: { value in
                    initialPresentationDataAndSettings = value
                    semaphore.signal()
                })
                semaphore.wait()
                
                let presentationDataPromise = Promise<PresentationData>()
                
                let appLockContext = AppLockContextImpl(rootPath: rootPath, window: nil, rootController: nil, applicationBindings: applicationBindings, accountManager: accountManager, presentationDataSignal: presentationDataPromise.get(), lockIconInitialFrame: {
                    return nil
                })
                
                let sharedContext = SharedAccountContextImpl(mainWindow: nil, basePath: rootPath, encryptionParameters: ValueBoxEncryptionParameters(forceEncryptionIfNoSet: false, key: ValueBoxEncryptionParameters.Key(data: self.initializationData.encryptionParameters.0)!, salt: ValueBoxEncryptionParameters.Salt(data: self.initializationData.encryptionParameters.1)!), accountManager: accountManager, appLockContext: appLockContext, applicationBindings: applicationBindings, initialPresentationDataAndSettings: initialPresentationDataAndSettings!, networkArguments: NetworkInitializationArguments(apiId: self.initializationData.apiId, apiHash: self.initializationData.apiHash, languagesCategory: self.initializationData.languagesCategory, appVersion: self.initializationData.appVersion, voipMaxLayer: 0, voipVersions: [], appData: .single(self.initializationData.bundleData), autolockDeadine: .single(nil), encryptionProvider: OpenSSLEncryptionProvider()), rootPath: rootPath, legacyBasePath: nil, legacyCache: nil, apsNotificationToken: .never(), voipNotificationToken: .never(), setNotificationCall: { _ in }, navigateToChat: { _, _, _ in })
                presentationDataPromise.set(sharedContext.presentationData)
                internalContext = InternalContext(sharedContext: sharedContext)
                globalInternalContext = internalContext
            }
            
            var immediatePeerId: PeerId?
            if #available(iOS 13.2, *), let sendMessageIntent = self.getExtensionContext()?.intent as? INSendMessageIntent {
                if let contact = sendMessageIntent.recipients?.first, let handle = contact.customIdentifier, handle.hasPrefix("tg") {
                    let string = handle.suffix(from: handle.index(handle.startIndex, offsetBy: 2))
                    if let peerId = Int64(string) {
                        immediatePeerId = PeerId(peerId)
                    }
                }
            }
            
            let account: Signal<(SharedAccountContextImpl, Account, [AccountWithInfo]), ShareAuthorizationError> = internalContext.sharedContext.accountManager.transaction { transaction -> (SharedAccountContextImpl, LoggingSettings) in
                return (internalContext.sharedContext, transaction.getSharedData(SharedDataKeys.loggingSettings) as? LoggingSettings ?? LoggingSettings.defaultSettings)
            }
            |> castError(ShareAuthorizationError.self)
            |> mapToSignal { sharedContext, loggingSettings -> Signal<(SharedAccountContextImpl, Account, [AccountWithInfo]), ShareAuthorizationError> in
                Logger.shared.logToFile = loggingSettings.logToFile
                Logger.shared.logToConsole = loggingSettings.logToConsole
                
                Logger.shared.redactSensitiveData = loggingSettings.redactSensitiveData
                
                return combineLatest(sharedContext.activeAccountsWithInfo, accountManager.transaction { transaction -> (Set<AccountRecordId>, PeerId?) in
                    let accountRecords = Set(transaction.getRecords().map { record in
                        return record.id
                    })
                    let intentsSettings = transaction.getSharedData(ApplicationSpecificSharedDataKeys.intentsSettings) as? IntentsSettings ?? IntentsSettings.defaultSettings
                    return (accountRecords, intentsSettings.account)
                })
                |> castError(ShareAuthorizationError.self)
                |> take(1)
                |> mapToSignal { primaryAndAccounts, validAccountIdsAndIntentsAccountId -> Signal<(SharedAccountContextImpl, Account, [AccountWithInfo]), ShareAuthorizationError> in
                    var (maybePrimary, accounts) = primaryAndAccounts
                    let (validAccountIds, intentsAccountId) = validAccountIdsAndIntentsAccountId
                    for i in (0 ..< accounts.count).reversed() {
                        if !validAccountIds.contains(accounts[i].account.id) {
                            accounts.remove(at: i)
                        }
                    }
                    
                    if let _ = immediatePeerId, let intentsAccountId = intentsAccountId {
                        for account in accounts {
                            if account.peer.id == intentsAccountId {
                                maybePrimary = account.account.id
                            }
                        }
                    }
                    
                    guard let primary = maybePrimary, validAccountIds.contains(primary) else {
                        return .fail(.unauthorized)
                    }
                    
                    guard let info = accounts.first(where: { $0.account.id == primary }) else {
                        return .fail(.unauthorized)
                    }
                    
                    return .single((sharedContext, info.account, Array(accounts)))
                }
            }
            |> take(1)
            
            let applicationInterface = account
            |> mapToSignal { sharedContext, account, otherAccounts -> Signal<(AccountContext, PostboxAccessChallengeData, [AccountWithInfo]), ShareAuthorizationError> in
                let limitsConfigurationAndContentSettings = account.postbox.transaction { transaction -> (LimitsConfiguration, ContentSettings, AppConfiguration) in
                    return (
                        transaction.getPreferencesEntry(key: PreferencesKeys.limitsConfiguration) as? LimitsConfiguration ?? LimitsConfiguration.defaultValue,
                        getContentSettings(transaction: transaction),
                        getAppConfiguration(transaction: transaction)
                    )
                }
                return combineLatest(sharedContext.accountManager.sharedData(keys: [ApplicationSpecificSharedDataKeys.presentationPasscodeSettings]), limitsConfigurationAndContentSettings, sharedContext.accountManager.accessChallengeData())
                |> take(1)
                |> deliverOnMainQueue
                |> castError(ShareAuthorizationError.self)
                |> map { sharedData, limitsConfigurationAndContentSettings, data -> (AccountContext, PostboxAccessChallengeData, [AccountWithInfo]) in
                    updateLegacyLocalization(strings: sharedContext.currentPresentationData.with({ $0 }).strings)
                    let context = AccountContextImpl(sharedContext: sharedContext, account: account, limitsConfiguration: limitsConfigurationAndContentSettings.0, contentSettings: limitsConfigurationAndContentSettings.1, appConfiguration: limitsConfigurationAndContentSettings.2)
                    return (context, data.data, otherAccounts)
                }
            }
            |> deliverOnMainQueue
            |> afterNext { [weak self] context, accessChallengeData, otherAccounts in
                setupLegacyComponents(context: context)
                initializeLegacyComponents(application: nil, currentSizeClassGetter: { return .compact }, currentHorizontalClassGetter: { return .compact }, documentsPath: "", currentApplicationBounds: { return CGRect() }, canOpenUrl: { _ in return false}, openUrl: { _ in })
                
                let displayShare: () -> Void = {
                    var cancelImpl: (() -> Void)?
                    
                    let requestUserInteraction: ([UnpreparedShareItemContent]) -> Signal<[PreparedShareItemContent], NoError> = { content in
                        return Signal { [weak self] subscriber in
                            switch content[0] {
                                case let .contact(data):
                                    let controller = deviceContactInfoController(context: context, subject: .filter(peer: nil, contactId: nil, contactData: data, completion: { peer, contactData in
                                        let phone = contactData.basicData.phoneNumbers[0].value
                                        if let vCardData = contactData.serializedVCard() {
                                            subscriber.putNext([.media(.media(.standalone(media: TelegramMediaContact(firstName: contactData.basicData.firstName, lastName: contactData.basicData.lastName, phoneNumber: phone, peerId: nil, vCardData: vCardData))))])
                                        }
                                        subscriber.putCompletion()
                                    }), completed: nil, cancelled: {
                                        cancelImpl?()
                                    })
                                    
                                    if let strongSelf = self, let window = strongSelf.mainWindow {
                                        controller.presentationArguments = ViewControllerPresentationArguments(presentationAnimation: .modalSheet)
                                        window.present(controller, on: .root)
                                    }
                                    break
                            }
                            return EmptyDisposable
                        } |> runOn(Queue.mainQueue())
                    }
                    
                    let sentItems: ([PeerId], [PreparedShareItemContent], Account) -> Signal<ShareControllerExternalStatus, NoError> = { peerIds, contents, account in
                        let sentItems = sentShareItems(account: account, to: peerIds, items: contents)
                        |> `catch` { _ -> Signal<
                            Float, NoError> in
                            return .complete()
                        }
                        return sentItems
                        |> map { value -> ShareControllerExternalStatus in
                            return .progress(value)
                        }
                        |> then(.single(.done))
                    }
                                        
                    let shareController = ShareController(context: context, subject: .fromExternal({ peerIds, additionalText, account in
                        if let strongSelf = self, let inputItems = strongSelf.getExtensionContext()?.inputItems, !inputItems.isEmpty, !peerIds.isEmpty {
                            let rawSignals = TGItemProviderSignals.itemSignals(forInputItems: inputItems)!
                            return preparedShareItems(account: account, to: peerIds[0], dataItems: rawSignals, additionalText: additionalText)
                            |> map(Optional.init)
                            |> `catch` { _ -> Signal<PreparedShareItems?, NoError> in
                                return .single(nil)
                            }
                            |> mapToSignal { state -> Signal<ShareControllerExternalStatus, NoError> in
                                guard let state = state else {
                                    return .single(.done)
                                }
                                switch state {
                                    case .preparing:
                                        return .single(.preparing)
                                    case let .progress(value):
                                        return .single(.progress(value))
                                    case let .userInteractionRequired(value):
                                        return requestUserInteraction(value)
                                        |> mapToSignal { contents -> Signal<ShareControllerExternalStatus, NoError> in
                                            return sentItems(peerIds, contents, account)
                                        }
                                    case let .done(contents):
                                        return sentItems(peerIds, contents, account)
                                }
                            }
                        } else {
                            return .single(.done)
                        }
                    }), externalShare: false, switchableAccounts: otherAccounts, immediatePeerId: immediatePeerId)
                    shareController.presentationArguments = ViewControllerPresentationArguments(presentationAnimation: .modalSheet)
                    shareController.dismissed = { _ in
                        self?.getExtensionContext()?.completeRequest(returningItems: nil, completionHandler: nil)
                    }
                    
                    cancelImpl = { [weak shareController] in
                        shareController?.dismiss(completion: { [weak self] in
                            self?.getExtensionContext()?.completeRequest(returningItems: nil, completionHandler: nil)
                        })
                    }
                    
                    if let strongSelf = self {
                        if let currentShareController = strongSelf.currentShareController {
                            currentShareController.dismiss()
                        }
                        strongSelf.currentShareController = shareController
                        strongSelf.mainWindow?.present(shareController, on: .root)
                    }
                                        
                    context.account.resetStateManagement()
                }
                
                let modalPresentation: Bool
                if #available(iOSApplicationExtension 13.0, iOS 13.0, *) {
                    modalPresentation = true
                } else {
                    modalPresentation = false
                }
                
                let _ = passcodeEntryController(context: context, animateIn: true, modalPresentation: modalPresentation, completion: { value in
                    if value {
                        displayShare()
                    } else {
                        Queue.mainQueue().after(0.5, {
                            self?.getExtensionContext()?.completeRequest(returningItems: nil, completionHandler: nil)
                        })
                    }
                }).start(next: { controller in
                    guard let strongSelf = self, let controller = controller else {
                        return
                    }
                    
                    if let currentPasscodeController = strongSelf.currentPasscodeController {
                        currentPasscodeController.dismiss()
                    }
                    strongSelf.currentPasscodeController = controller
                    strongSelf.mainWindow?.present(controller, on: .root)
                })
            }
            
            self.disposable.set(applicationInterface.start(next: { _, _, _ in }, error: { [weak self] error in
                guard let strongSelf = self else {
                    return
                }
                let presentationData = internalContext.sharedContext.currentPresentationData.with { $0 }
                let controller = standardTextAlertController(theme: AlertControllerTheme(presentationData: presentationData), title: presentationData.strings.Share_AuthTitle, text: presentationData.strings.Share_AuthDescription, actions: [TextAlertAction(type: .defaultAction, title: presentationData.strings.Common_OK, action: {
                    self?.getExtensionContext()?.completeRequest(returningItems: nil, completionHandler: nil)
                })])
                strongSelf.mainWindow?.present(controller, on: .root)
            }, completed: {}))
        }
    }
}