MessageObject.swift

//
//  MessageObject.swift
//
//  Created by Kalpesh Talkar on 29/05/16.
//  Copyright © 2016 Kalpesh Talkar. All rights reserved.
//

import UIKit
import MessageUI

@objc protocol MessageObjectDelegate {
    func messageObject(object: MessageObject, didFinishWithResult result: MessageComposeResult)
}

@IBDesignable class MessageObject: NSObject, MFMessageComposeViewControllerDelegate {
    
    @IBOutlet weak var viewController: UIViewController!
    
    @IBInspectable var messageBody: String!
    @IBInspectable var recipient: String!
    @IBInspectable var showResultAlert: Bool = false
    
    var delegate: MessageObjectDelegate?
    
    // MARK: - init methods
    override init() {
        super.init()
    }
    
    init(viewController: UIViewController) {
        super.init()
        self.viewController = viewController
    }
    
    init(viewController: UIViewController, delegate: MessageObjectDelegate) {
        super.init()
        self.viewController = viewController
        self.delegate = delegate
    }
    
    // MARK: - send message
    @IBAction func sendMessage(sender: AnyObject) {
        if messageBody == nil {
            messageBody = ""
        }
        if recipient == nil {
            recipient = ""
        }
        
        sendMessage(messageBody, recipients: [recipient])
    }
    
    func sendMessage(message: String, recipients: [String]) {
        if (MFMessageComposeViewController.canSendText()) {
            let controller = MFMessageComposeViewController()
            controller.body = messageBody
            controller.recipients = recipients
            controller.messageComposeDelegate = self
            viewController.presentViewController(controller, animated: true, completion: nil)
        } else {
            showAlert("Error",message: "Unable to send message.")
        }
    }
    
    // MARK: - MFMessageComposeViewControllerDelegate
    func messageComposeViewController(controller: MFMessageComposeViewController, didFinishWithResult result: MessageComposeResult) {
        viewController.dismissViewControllerAnimated(true, completion: nil)
        if showResultAlert {
            if result == MessageComposeResultCancelled {
            } else if result == MessageComposeResultFailed {
                showAlert("Error",message: "Message sending failed")
            } else if result == MessageComposeResultSent {
                showAlert("Success",message: "Message sent successfully.")
            }
        }
    }
    
    // MARK: - Error Alert
    internal func showAlert(title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
        let ok = UIAlertAction(title: "OK", style: .Default, handler: nil)
        alert.addAction(ok)
        viewController.presentViewController(alert, animated: true, completion: nil)
    }

}