[Sociable] protocol to handle social deeplinking #swift #protocol

Sociable.swift

import UIKit
import MessageUI

protocol Sociable: MFMailComposeViewControllerDelegate, UINavigationControllerDelegate {
    func openInstagramAccount(withID id: String)
    func openTwitterAccount(withID id: String)
    func openFacebookAccount(withID id: String)
    func openSnapchatAccount(withID id: String)
    func sendEmail(to email: String, withDefaultMessage message: String)
    func call(_ mobileNumber: String)
}

extension Sociable where Self: UIViewController {
    
    //MARK: - Actions
    
    func openFacebookAccount(withID id: String) {
        deeplink(to: "fb://facebook.com/\(id)/", or: "https://www.facebook.com/\(id)/")
    }
    
    func openTwitterAccount(withID id: String) {
        deeplink(to: "twitter://user?screen_name=\(id)", or: "https://twitter.com/\(id)")
    }
    
    func openSnapchatAccount(withID id: String) {
        deeplink(to: "snapchat://add/\(id)", or: "https://www.snapchat.com/add/\(id)/")
    }
    
    func openInstagramAccount(withID id: String) {
        deeplink(to: "instagram://user?username=\(id)", or: "https://instagram.com/\(id)/")
    }
    
    func call(_ mobileNumber: String) {
        guard let telURL = URL(string: "tel://\(mobileNumber)") else { return }
        if UIApplication.shared.canOpenURL(telURL) {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(telURL)
            } else {
                UIApplication.shared.openURL(telURL)
            }
        }
    }
    
    func sendEmail(to email: String, withDefaultMessage message: String) {
        if MFMailComposeViewController.canSendMail() {
            let composer = MFMailComposeViewController()
            composer.mailComposeDelegate = self
            composer.setToRecipients([email])
            composer.setMessageBody(message, isHTML: false)
            self.present(composer, animated: true, completion: nil)
        } else {
            error(withMessage: NSLocalizedString("Can't send Email", comment: "Error with sending email"))
        }
    }
    
    //MARK: - Helpers
    
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith
        result: MFMailComposeResult, error: Error?) {
        
        switch result {
        case MFMailComposeResult.cancelled:
            print("Mail cancelled")
            break
        case MFMailComposeResult.saved:
            print("Mail saved")
            break
        case MFMailComposeResult.sent:
            print("Mail sent")
            break
        case MFMailComposeResult.failed:
            guard let error = error else { return }
            self.error(withMessage: error.localizedDescription)
        }

        dismiss(animated: true, completion: nil)
    }
    
    private func deeplink(to deeplink: String, or alternative: String) {
        guard let deeplinkURL: URL = URL(string: deeplink) else { return }
        guard let webURL: URL = URL(string: alternative) else { return }
        if UIApplication.shared.canOpenURL(deeplinkURL) {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(deeplinkURL)
            } else {
                UIApplication.shared.openURL(deeplinkURL)
            }
        } else {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(webURL)
            } else {
                UIApplication.shared.openURL(webURL)
            }
        }
    }
    
    private func error(withMessage message: String) {
        let alert = UIAlertController(title: NSLocalizedString("Error", comment: "Error alert title"), message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Error alert action title"), style: .cancel, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
}