MyAlertController.swift

//
//  MyAlertController.swift
//
//  Copyright © 2016年 Krimpedance. All rights reserved.
//

import UIKit

enum MyAlertControllerType {
    case SingleButton(String)
    case DoubleButton(String, String)
}

enum MyAlertControllerAction {
    case Cancel
    case Accept
}

class MyAlertController: UIViewController {
    
    @IBOutlet weak var contentView: UIView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var messageLabel: UILabel!
    
    @IBOutlet var singleButtonView: UIView!
    @IBOutlet var doubleButtonView: UIView!
    
    @IBOutlet weak var singleViewAcceptButton: UIButton!
    @IBOutlet weak var doubleViewCancelButton: UIButton!
    @IBOutlet weak var doubleViewAcceptButton: UIButton!
    
    var titleText: String = ""
    var messageText: String = ""
    var buttonType = MyAlertControllerType.SingleButton("")
    
    typealias AlertAction = (action: MyAlertControllerAction)->()
    var handler: AlertAction?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        singleViewAcceptButton.addTarget(self, action: #selector(acceptButtonTapped), forControlEvents: .TouchUpInside)
        doubleViewAcceptButton.addTarget(self, action: #selector(acceptButtonTapped), forControlEvents: .TouchUpInside)
        doubleViewCancelButton.addTarget(self, action: #selector(cancelButtonTapped), forControlEvents: .TouchUpInside)
        
        titleLabel.text = titleText
        messageLabel.text = messageText
     
        switch buttonType {
        case let .SingleButton(title) :
            addSingleButton(title: title)
            
        case let .DoubleButton(cancel, accept) :
            addDoubleButton(cancelTitle: cancel, acceptTitle: accept)
        }

        animationContentView(true)
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        animationContentView(false)
    }
    
    private func animationContentView(hidden: Bool, completed: (()->())? = nil) {
        let alpha: CGFloat
        if hidden { alpha = 0 }
        else { alpha = 1 }
        
        UIView.animateWithDuration(0.2, animations: {
            self.view.alpha = alpha
        }) { _ in
            completed?()
        }
    }
    
    private func addSingleButton(title title: String) {
        singleButtonView.frame.origin = CGPoint(x: 0, y: 120)
        contentView.addSubview(singleButtonView)
        singleViewAcceptButton.setTitle(title, forState: .Normal)
    }
    
    private func addDoubleButton(cancelTitle cancelTitle: String, acceptTitle: String) {
        doubleButtonView.frame.origin = CGPoint(x: 0, y: 120)                        
        contentView.addSubview(doubleButtonView)
        doubleViewCancelButton.setTitle(cancelTitle, forState: .Normal)
        doubleViewAcceptButton.setTitle(acceptTitle, forState: .Normal)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}


/**
 *  Button actions ---------------------
 */
extension MyAlertController {
    func acceptButtonTapped() {
        animationContentView(true) {
            self.handler?(action: .Accept)
            self.dismissViewControllerAnimated(false, completion: nil)
        }
    }
    
    func cancelButtonTapped() {
        animationContentView(true) {
            self.handler?(action: .Cancel)
            self.dismissViewControllerAnimated(false, completion: nil)
        }
    }
}


/**
 *  Show ---------------------
 */
extension MyAlertController {
    class func show(presentintViewController vc: UIViewController, title: String, message: String, buttonTitle: String, handler: AlertAction?) {
        guard let alert = UIStoryboard(name: "MyAlertController", bundle: nil).instantiateInitialViewController()
            as? MyAlertController else { return }
        alert.titleText = title
        alert.messageText = message
        alert.buttonType = .SingleButton(buttonTitle)
        alert.handler = handler
        
        vc.presentViewController(alert, animated: false, completion: nil)
    }
    
    class func show(presentintViewController vc: UIViewController, title: String, message: String, cancelTitle: String, acceptTitle: String, handler: AlertAction?) {
        guard let alert = UIStoryboard(name: "MyAlertController", bundle: nil).instantiateInitialViewController()                          
            as? MyAlertController else { return }
        alert.titleText = title
        alert.messageText = message
        alert.buttonType = .DoubleButton(cancelTitle, acceptTitle)
        alert.handler = handler
        
        vc.presentViewController(alert, animated: false, completion: nil)
    }
}