//
//  SettingsViewController.swift
//  Wallet
//
//  Created by Saveliy Stavitsky on 9/9/21.
//  Copyright © 2021 AM. All rights reserved.
//

import UIKit
import Combine

final class SettingsViewController: UIViewController {

    @IBOutlet private var settingsView: AccountViewSettings!
   
    private var cancellables = Set<AnyCancellable>()
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = L10n.Account.Settings.title
        self.navigationItem.leftBarButtonItem = .pop(self)
        
        self.notificationSwitch()
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(self.notificationSwitch),
                                               name: UIApplication.willEnterForegroundNotification,
                                               object: nil)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        self.settingsView.actionPublisher
            .receive(on: DispatchQueue.main)
            .sink { [weak self] in self?.handleAction($0) }
            .store(in: &self.cancellables)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        self.cancellables.removeAll()
    }
    
    // MARK: - Private
    
    private func handleAction(_ action: AccountViewSettings.Action) {
        switch action {
        case .password:
            self.handlePasswordAction()
        case .about:
            self.handleAboutAction()
        case .changeInterfaceStyle:
            self.handleChangeInterfaceStyleAction()
        case .changeProtection:
            self.handleChangeProtectionAction()
        }
    }
    
    private func handlePasswordAction() {
        self.dismiss(animated: true)
        
        guard UserDefaults.standard.bool(forKey: "isPinPwdMode") else {
            AccountViewPassword.show(in: self)
            return
        }
        let accountControollerPin = WalletPinController.instantiate()
        
        let ctrl = UINavigationController(rootViewController: accountControollerPin)
        accountControollerPin.type = .old
        accountControollerPin.viewModel.validatePin = { [weak ctrl, weak self] (pin: String) -> Bool in
            guard Account.Service.check(password: pin), !pin.isEmpty, pin.count == 4 else {
                Account.Service.Authorize.shared.savePinTry()
                return false
            }
            
            ctrl?.dismiss(animated: false)
            Account.Service.Authorize.shared.update(password: pin)
            
            let accountControollerPin = WalletPinController.instantiate()
            let ctrl = UINavigationController(rootViewController: accountControollerPin)
            accountControollerPin.type = .new
            accountControollerPin.viewModel.validatePin = { [weak ctrl] (newPin: String) -> Bool in
                if Account.Service.check(password: pin) {
                    do {
                        try Accounts().update(password: newPin, old: pin)
                    } catch {
                        Alert.error(text: L10n.Account.Password.currentWrong)
                        return false
                    }
                    Account.Service.Authorize.shared.update(password: newPin)
                    ctrl?.dismiss(animated: true)
                    return true
                } else {
                    Alert.error(text: L10n.Account.Password.currentWrong)
                    return false
                }
            }
            ctrl.modalPresentationStyle = .fullScreen
            self?.present(ctrl, animated: true)
            
            Account.Service.Authorize.shared.clearPinTries()
            return true
        }
        ctrl.modalPresentationStyle = .fullScreen
        self.present(ctrl, animated: true)
    }
    
    private func handleAboutAction() {
        self.navigationController?.pushViewController(AccountControllerAbout(), animated: true)
    }
    
    private func handleChangeInterfaceStyleAction() {
        self.dismiss(animated: true)
        
        let vc = StoryboardScene.AccountOnboarding.accountOnboardingControllerInterfaceType.instantiate()
        vc.isStep = false
        self.present(vc, animated: true)
    }
    
    private func handleChangeProtectionAction() {
        self.dismiss(animated: true)
        
        AccountViewAuthorize.showGetPassword(in: self, { [weak self] oldPassword in
            guard let self else { return }
            
            let view = AccountViewProtectionLevel()
            view.didSubmit = { submitted in
                self.dismiss(animated: true)
                
                guard submitted else { return }
                if UserDefaults.standard.bool(forKey: "isPinPwdMode") {
                    AccountViewPassword.show(in: self, oldPassword: oldPassword)
                } else {
                    let accountControollerPin = WalletPinController.instantiate()
                    
                    let ctrl = UINavigationController(rootViewController: accountControollerPin)
                    accountControollerPin.type = .new
                    accountControollerPin.viewModel.validatePin = { [weak ctrl] (pin: String) -> Bool in
                        if Account.Service.check(password: oldPassword) {
                            do {
                                try Accounts().update(password: pin, old: oldPassword)
                                UserDefaults.standard.setValue(!UserDefaults.standard.bool(forKey: "isPinPwdMode"), forKey: "isPinPwdMode")
                                Account.Service.Authorize.shared.update(password: pin)
                                ctrl?.dismiss(animated: true)
                                return true
                            } catch {
                                Alert.error(text: L10n.Account.Password.currentWrong)
                                return false
                            }
                        } else {
                            Alert.error(text: L10n.Account.Password.currentWrong)
                            return false
                        }
                    }
                    ctrl.modalPresentationStyle = .fullScreen
                    self.present(ctrl, animated: true)
                }
            }
            let viewController =
                CommonControllerPopup(image: UserDefaults.standard.bool(forKey: "isPinPwdMode")
                                        ? Asset.accountProtectionUnlocked.image
                                        : Asset.accountProtectionLocked.image,
                                  title: L10n.Account.Settings.protection,
                                  views: [view], spacing: 0)
            
            self.present(viewController, animated: true)
        })
    }
    
    @objc
    private func notificationSwitch() {
        let center = UNUserNotificationCenter.current()
        center.getNotificationSettings { settings in
            switch settings.authorizationStatus {
            case .authorized, .provisional:
                DispatchQueue.main.async { [weak self] in
                    self?.settingsView.notificationsEnabledLabel.text = L10n.Account.Settings.notificationsEnabled
                }
            default:
                DispatchQueue.main.async { [weak self] in
                    self?.settingsView.notificationsEnabledLabel.text =  L10n.Account.Settings.notificationsDisabled
                }
            }
        }
    }
}