/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This class describes the notification bar that is shown when a CloudKit notification is received.

*/

import UIKit

import CloudKit

class NotificationBar: UIView {

    var notification: CKNotification? {

        didSet {

            if let navigationController = window!.rootViewController as? UINavigationController {

                for viewController in navigationController.viewControllers {

                    viewController.navigationItem.hidesBackButton = (notification != nil)

                }

            }

            setNeedsLayout()

            self.superview!.layoutIfNeeded()

        }

    }

    var heightConstraint: NSLayoutConstraint!

    var label: UILabel!

    var button: UIButton!

    required init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

        heightConstraint = NSLayoutConstraint(item: self, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: 0.0)

        translatesAutoresizingMaskIntoConstraints = false

        backgroundColor = UIColor.blackColor()

        addConstraint(heightConstraint)

        label = UILabel()

        label.text = "You have a new CloudKit notification!"

        label.textColor = UIColor.whiteColor()

        label.textAlignment = .Center

        label.translatesAutoresizingMaskIntoConstraints = false

        label.hidden = true

        label.userInteractionEnabled = true

        addSubview(label)

        button = UIButton()

        button.setTitle("✕", forState: .Normal)

        button.addTarget(self, action: #selector(NotificationBar.close), forControlEvents: .TouchDown)

        button.translatesAutoresizingMaskIntoConstraints = false

        button.hidden = true

        addSubview(button)

        let rightConstraint = NSLayoutConstraint(item: self, attribute: .RightMargin, relatedBy: .Equal, toItem: button, attribute: .Right, multiplier: 1.0, constant: 0.0)

        addConstraint(rightConstraint)

        let centerConstraint = NSLayoutConstraint(item: self, attribute: .CenterY, relatedBy: .Equal, toItem: button, attribute: .CenterY, multiplier: 1.0, constant: 0.0)

        addConstraint(centerConstraint)

        let leftConstraint = NSLayoutConstraint(item: self, attribute: .LeftMargin, relatedBy: .Equal, toItem: label, attribute: .Left, multiplier: 1.0, constant: 0.0)

        addConstraint(leftConstraint)

        let rightLabelConstraint = NSLayoutConstraint(item: button, attribute: .Left, relatedBy: .Equal, toItem: label, attribute: .Right, multiplier: 1.0, constant: 8.0)

        addConstraint(rightLabelConstraint)

        let centerLabelConstraint = NSLayoutConstraint(item: self, attribute: .CenterY, relatedBy: .Equal, toItem: label, attribute: .CenterY, multiplier: 1.0, constant: 0.0)

        addConstraint(centerLabelConstraint)

        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(NotificationBar.showNotification))

        label.addGestureRecognizer(tapGestureRecognizer)

    }

    func close() {

        UIView.animateWithDuration(0.4, animations: {

            self.label.hidden = true

            self.button.hidden = true

            self.heightConstraint.constant = 0

            self.notification = nil

        })

    }

    func show() {

        UIView.animateWithDuration(0.4, animations: {

            self.heightConstraint.constant = self.superview!.frame.size.height

            self.label.hidden = false

            self.button.hidden = false

            self.superview!.layoutIfNeeded()

        })

    }

    func showNotification() {

        if let _ = notification, navigationController = window!.rootViewController as? NavigationController, mainMenuViewController = navigationController.viewControllers.first as? MainMenuTableViewController {

            close()

            if let topViewController = navigationController.topViewController as? CodeSampleViewController where topViewController.selectedCodeSample is MarkNotificationsReadSample {

                topViewController.runCode(topViewController.runButton)

            } else {

                let notificationSample = mainMenuViewController.codeSampleGroups.last!.codeSamples.first

                navigationController.performSegueWithIdentifier("ShowLoadingView", sender: notificationSample)

            }

        }

    }

}