jsoncreator_app/JSONCreator_iOS/JSONCreator/DetailViewController.swift

//
//  DetailViewController.swift
//  JSONCreator
//
//  Created by Scott Pfeil on 8/2/19.
//  Copyright © 2019 Verizon Wireless. All rights reserved.
//

import UIKit
import MVMCoreUI

class DetailViewController: UIViewController {

    let textView = UITextView(frame: .zero)

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        guard textView.superview == nil else {
            return
        }
        view.addSubview(textView)
        if UIDevice.current.userInterfaceIdiom == .pad {
            textView.font = UIFont.systemFont(ofSize: 40)
        } else {
            textView.font = UIFont.systemFont(ofSize: 14)
        }
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        textView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        view.trailingAnchor.constraint(equalTo: textView.trailingAnchor).isActive = true
        view.safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: textView.bottomAnchor).isActive = true
        textView.delegate = self
        textView.smartDashesType = .no
        textView.smartQuotesType = .no
        textView.smartInsertDeleteType = .no
        textView.autocapitalizationType = .none
        
        let shareButton = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(shareButtonPressed))
        let buildButton = UIBarButtonItem(barButtonSystemItem: .play, target: self, action: #selector(play))
        navigationItem.setRightBarButtonItems([shareButton, buildButton], animated: true)
    }
    
    func showError(_ error: NSError) {
        let alert = UIAlertController(title: "Error", message: "\(error)", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
        present(alert, animated: true, completion: nil)
    }
    
    @objc func shareButtonPressed() {
        if let text = textView.text {
            let activityController = UIActivityViewController(activityItems: [text], applicationActivities: nil)
            activityController.popoverPresentationController?.barButtonItem = navigationItem.rightBarButtonItem
            present(activityController, animated: true, completion: nil)
        }
    }
    
    @objc func play() {
        do {
            let decoder = JSONDecoder()
            if let data = textView.text.data(using: .utf8), let jsonObject = try JSONSerialization.jsonObject(with: data, options: []) as? [AnyHashable: Any] {
                let pageModel = try decoder.decode(PageModel.self, from: data)
                let page = jsonObject.optionalDictionaryForKey(KeyPage)
                let pageType = page?.optionalStringForKey(KeyPageType)
                let template = page?.optionalStringForKey("template")
                var errorObject = MVMCoreErrorObject(title: nil, message: "No Template Found", code: ErrorCode.initViewController.rawValue, domain: ErrorDomainNative, location: nil)
                if let viewController = MVMCoreUIViewControllerMappingObject.shared()?.createMFViewController(ofTemplate: template, pageType: pageType), let loadObject = MVMCoreLoadObject(pageJSON: page, modulesJSON: nil, requestParameters: nil, dataForPage: nil, delegateObject: nil), viewController.shouldFinishProcessingLoad(loadObject, error: &errorObject!) {
                    let navigation = UINavigationController(rootViewController: viewController)
                    viewController.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(close))
                    MVMCoreNavigationHandler.shared()?.present(navigation, animated: true)
                } else if let errorObject = errorObject {
                    let error = NSError(domain: ErrorDomainNative, code: ErrorCode.initViewController.rawValue, userInfo: [NSLocalizedDescriptionKey: errorObject.messageToDisplay!])
                    showError(error)
                }
            }
        } catch {
            showError(error as NSError)
        }
    }
    
    @objc func close() {
        MVMCoreNavigationHandler.shared()?.dismissTopViewController(animated: true)
    }
}

extension DetailViewController: UITextViewDelegate {
    func textViewShouldEndEditing(_ textView: UITextView) -> Bool {
        guard textView.text.count > 0 else {
            return true
        }
        do {
            if let data = textView.text.data(using: .utf8) {
                let jsonObject = try JSONSerialization.jsonObject(with: data, options: [])
                _ = try JSONSerialization.data(withJSONObject: jsonObject, options: .prettyPrinted)
            }
            return true
        } catch {
            let alert = UIAlertController(title: "Error", message: "\(error)", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
            present(alert, animated: true, completion: nil)
            return false
        }
    }
    
    func textViewDidEndEditing(_ textView: UITextView) {
        guard textView.text.count > 0 else {
            return
        }
        do {
            if let data = textView.text.data(using: .utf8) {
                let jsonObject = try JSONSerialization.jsonObject(with: data, options: [])
                let prettyData = try JSONSerialization.data(withJSONObject: jsonObject, options: .prettyPrinted)
                let prettyString = String.init(data: prettyData, encoding: .utf8)
                textView.text = prettyString
            }
        } catch {
            let alert = UIAlertController(title: "Error", message: "\(error)", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
            present(alert, animated: true, completion: nil)
        }
    }
}