//
//  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 {
    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.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)
        
    }
    
    func hideKeyboard() {
        view.endEditing(false)
    }
    
    func buttonTouch(){
        
        sendResult(textField.text!)
        
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

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

    }
    
    func showErrorAlert() {
        let alertController = UIAlertController(title: "Error", message:
            "Wrong code", preferredStyle: UIAlertControllerStyle.alert)
        alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))
        
        self.present(alertController, animated: true, completion: nil)
        
    }
    
    override func viewWillAppear(_ animated: Bool) {
        
        topView.backgroundColor = UIColor.white
        settingButton.setTitle("+", for: .normal)
        textField.placeholder = "Enter code"
        textField.borderStyle = .roundedRect
        
        //self.present(readerViewController, animated: true)
        
        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: 8, y: 5, width: readerViewController.view.frame.size.width - 50, height: 30)
        settingButton.frame = CGRect(x: textField.frame.maxX + 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)
/*
                if let platformChannel = self.platformChannel {
                   // self.dismiss(animated: true, completion: {
                     //   self.presentingViewController?.dismiss(animated: true, completion: {
                            platformChannel.invokeMethod("findUserAndPurchase", arguments: [data], result: { (result: Any?) in
                                
                                print("result: \(result ?? "")")
                                self.presentingViewController?.dismiss(animated: false, completion: { self.dismiss(animated: true) })
                            })
                       // })
                   // })
//                    let result = platformChannel.invokeMethod("getUserByCode", arguments: [data], handleResult(result: FlutterResult))
//                    print(result);
                }
                /*
                let toast = UIAlertController()
                toast.message = data
                toast.add
                toast.show()
*/
                //navigationController?.popViewController(animated: true)
 */
            }
        }
        //navigationController?.popViewController(animated: true)

    }

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

}