/*
Copyright 2019-2024 New Vector Ltd.

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

import UIKit

protocol KeyBackupSetupSuccessFromRecoveryKeyViewControllerDelegate: AnyObject {
    func keyBackupSetupSuccessFromRecoveryKeyViewControllerDidTapDoneAction(_ viewController: KeyBackupSetupSuccessFromRecoveryKeyViewController)
}

final class KeyBackupSetupSuccessFromRecoveryKeyViewController: UIViewController {
    
    // MARK: - Properties
    
    // MARK: Outlets
    
    @IBOutlet private weak var keyBackupLogoImageView: UIImageView!
    @IBOutlet private weak var titleLabel: UILabel!
    @IBOutlet private weak var informationLabel: UILabel!
    
    @IBOutlet private weak var recoveryKeySectionBackgroundView: UIView!
    
    @IBOutlet private weak var recoveryKeyTitleLabel: UILabel!
    @IBOutlet private weak var recoveryKeyLabel: UILabel!
    
    @IBOutlet private weak var separatorView: UIView!
    
    @IBOutlet private weak var makeACopyButton: UIButton!
    
    @IBOutlet private weak var madeACopyButtonBackgroundView: UIView!
    @IBOutlet private weak var madeACopyButton: UIButton!
    
    // MARK: Private
    
    private var theme: Theme!
    private var recoveryKey: String!
    private var hasMadeARecoveryKeyCopy: Bool = false
    
    // MARK: Public
    
    weak var delegate: KeyBackupSetupSuccessFromRecoveryKeyViewControllerDelegate?
    
    // MARK: - Setup
    
    class func instantiate(with recoveryKey: String) -> KeyBackupSetupSuccessFromRecoveryKeyViewController {
        let viewController = StoryboardScene.KeyBackupSetupSuccessFromRecoveryKeyViewController.initialScene.instantiate()
        viewController.theme = ThemeService.shared().theme
        viewController.recoveryKey = recoveryKey
        return viewController
    }
    
    // MARK: - Life cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        
        self.title = VectorL10n.keyBackupSetupTitle
        
        self.setupViews()
        self.registerThemeServiceDidChangeThemeNotification()
        self.update(theme: self.theme)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // Hide back button
        self.navigationItem.setHidesBackButton(true, animated: animated)
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return self.theme.statusBarStyle
    }
    
    // MARK: - Private
    
    private func setupViews() {
        
        let keybackupLogoImage = Asset.Images.keyBackupLogo.image.withRenderingMode(.alwaysTemplate)
        self.keyBackupLogoImageView.image = keybackupLogoImage
        
        self.titleLabel.text = VectorL10n.keyBackupSetupSuccessTitle
        self.informationLabel.text = BWIL10n.keyBackupSetupSuccessFromRecoveryKeyInfo
        
        self.recoveryKeyTitleLabel.text = BWIL10n.keyBackupSetupSuccessFromRecoveryKeyRecoveryKeyTitle
        self.recoveryKeyLabel.text = self.recoveryKey
        
        self.makeACopyButton.setTitle(VectorL10n.keyBackupSetupSuccessFromRecoveryKeyMakeCopyAction, for: .normal)
        self.madeACopyButton.setTitle(VectorL10n.keyBackupSetupSuccessFromRecoveryKeyMadeCopyAction, for: .normal)
        
        self.updateDoneButton()
    }
    
    private func update(theme: Theme) {
        self.theme = theme
        
        self.view.backgroundColor = theme.headerBackgroundColor
        
        if let navigationBar = self.navigationController?.navigationBar {
            theme.applyStyle(onNavigationBar: navigationBar)
        }
        
        self.keyBackupLogoImageView.tintColor = theme.textPrimaryColor
        
        self.titleLabel.textColor = theme.textPrimaryColor
        self.informationLabel.textColor = theme.textPrimaryColor
        
        self.recoveryKeySectionBackgroundView.backgroundColor = theme.backgroundColor
        
        self.recoveryKeyTitleLabel.textColor = theme.textPrimaryColor
        self.recoveryKeyLabel.textColor = theme.textPrimaryColor
        
        self.separatorView.backgroundColor = theme.lineBreakColor
        
        theme.applyStyle(onButton: self.makeACopyButton)
        
        self.madeACopyButtonBackgroundView.backgroundColor = theme.backgroundColor
        theme.applyStyle(onButton: self.madeACopyButton)
    }
    
    private func registerThemeServiceDidChangeThemeNotification() {
        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
    }
    
    @objc private func themeDidChange() {
        self.update(theme: ThemeService.shared().theme)
    }
    
    private func shareRecoveryKey() {
        
        // Set up activity view controller
        let activityItems: [Any] = [ self.recoveryKey as Any ]
        let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
        
        activityViewController.completionWithItemsHandler = { (activityType, completed, returnedItems, error) in
            
            // Enable made copy button only if user has selected an activity item and has setup recovery key without passphrase
            if completed {
                self.hasMadeARecoveryKeyCopy = true
                self.updateDoneButton()
            }
        }
        
        // Configure source view when activity view controller is presented with a popover
        if let popoverPresentationController = activityViewController.popoverPresentationController {
            popoverPresentationController.sourceView = self.makeACopyButton
            popoverPresentationController.sourceRect = self.makeACopyButton.bounds
            popoverPresentationController.permittedArrowDirections = [.down, .up]
        }
        
        self.present(activityViewController, animated: true)
    }
    
    private func updateDoneButton() {
        self.madeACopyButton.isEnabled = self.hasMadeARecoveryKeyCopy
    }
    
    // MARK: - Actions
    
    @IBAction private func saveRecoveryKeyButtonAction(_ sender: Any) {
        self.shareRecoveryKey()
    }
    
    @IBAction private func doneButtonAction(_ sender: Any) {
        self.delegate?.keyBackupSetupSuccessFromRecoveryKeyViewControllerDidTapDoneAction(self)
    }
}