checker/ios/Runner/ScannerViewController.swift

//
//  ScannerViewController.swift
//  Runner
//
//  Created by Ivan Murashov on 13/07/2017.
//  Copyright © 2017 The Chromium Authors. All rights reserved.
//

import UIKit
import Flutter

extension ZBarSymbolSet: Sequence {
    //public typealias Element  = ZBarSymbol
    //public typealias Iterator = NSFastEnumerationIterator

    public func makeIterator() -> NSFastEnumerationIterator {
        return NSFastEnumerationIterator(self)
    }
}

@objc class ScannerViewController: UIViewController, ZBarReaderDelegate, UITextFieldDelegate {
    
    enum ButtonState {
        case card
        case phone
        
        var icon: UIImage {
            
            switch self {
                case .card: return UIImage(named: "card")!
                case .phone: return UIImage(named: "phone")!
            }
        }
        
        var inputText: String {
            switch self {
                case .card: return "Enter the barcode manualy"
                case .phone: return "Enter the phone manualy"
            }
        }
        
        var errorText: String {
            switch self {
            case .card: return "User with card number %@ not found"
            case .phone: return "User with phone number %@ not found"
            }
        }
        
        var searchType: String {
            switch self {
                case .card: return "card"
                case .phone: return "phone"
            }
        }
    }
    
    var buttonState: ButtonState = .card
    
    var platformChannel: FlutterMethodChannel?
    let readerViewController = ZBarReaderViewController()
    
    
    //Вьюшка для верхнего меню
    let topView = UIView()
    
    //Окно ввода кода
    let textField = UITextField()
    
    //Кнопка настроек
    var settingButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        readerViewController.readerDelegate = self
        readerViewController.readerView.zoom = 1.0
        readerViewController.showsZBarControls = false
        
        settingButton = UIButton(type: .system)
        settingButton.addTarget(self, action: #selector(ScannerViewController.buttonTouch), for: .touchUpInside)
        
        self.addChildViewController(readerViewController)
        self.view.addSubview(readerViewController.view)
        readerViewController.didMove(toParentViewController: self)
        
        readerViewController.view.addSubview(topView)
        topView.addSubview(textField)
        topView.addSubview(settingButton)
        
        textField.delegate = self
        //textField.keyboardType = .numberPad
        
        //Looks for single or multiple taps.
        let tap = UITapGestureRecognizer(target: self, action: #selector(ScannerViewController.hideKeyboard))
        readerViewController.view.addGestureRecognizer(tap)
        
        settingButton.setImage(self.buttonState.icon, for: .normal)
        textField.placeholder = self.buttonState.inputText
        
    }
    
    func hideKeyboard() {
        view.endEditing(false)
    }
    
    func buttonTouch(){
        
        switch self.buttonState {
            case .card: self.buttonState = .phone
            case .phone: self.buttonState = .card
        }
        settingButton.setImage(self.buttonState.icon, for: .normal)
        textField.placeholder = self.buttonState.inputText
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        sendResult(textField.text!)
        
        return true
    }
    
    func sendResult(_ str: String) {
        platformChannel?.invokeMethod("findUser", arguments: [str, buttonState.searchType], result: { (result: Any?) in
            if result is FlutterError {
                self.showErrorAlert(str)
            } else {
                
                self.dismiss(animated: true) {
                    self.platformChannel?.invokeMethod("purchase", arguments: [result, str])
                }
            }
            print("result: \(result.debugDescription )")
        })

    }
    
    func showErrorAlert(_ str: String) {
        let alertController = UIAlertController(
            title: "Error",
            message: String(format: buttonState.errorText, str),
            preferredStyle: UIAlertControllerStyle.alert
        )
        alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))
        
//        if let appDelegate = UIApplication.shared.delegate as? FlutterAppDelegate {
//            appDelegate.window.rootViewController?.present(alertController, animated: true, completion: nil)
//        }
        self.present(alertController, animated: true, completion: nil)
        
    }
    
    override func viewWillAppear(_ animated: Bool) {
        topView.backgroundColor = UIColor.white
        textField.borderStyle = .roundedRect
        super.viewWillAppear(animated)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
    }
    
    override func viewWillLayoutSubviews() {
        
        readerViewController.view.frame = view.bounds
        topView.frame = CGRect(x: 0, y: 0, width: readerViewController.view.frame.size.width, height: 40)
        textField.frame = CGRect(x: settingButton.frame.maxX + 8 + 20 + 5, y: 5, width: readerViewController.view.frame.size.width - 50, height: 30)
        settingButton.frame = CGRect(x: 8, y: 10, width: 20, height: 20)
        
     }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        guard let symbols = info[ZBarReaderControllerResults] as? ZBarSymbolSet else { return }

        for symbol in symbols {

            if let symbol = symbol as? ZBarSymbol, let data = symbol.data {
                sendResult(data)
 
            }
        }
    }

    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

}