//
//  ViewController.swift
//  TinkoffChat
//
//  Created by Никита Бабенко on 23.09.2018.
//  Copyright © 2018 Tinkoff Fintech. All rights reserved.
//

import UIKit

class GCDDataManager{
    var data: String
    var queue: DispatchQueue
    init(_ queueForFiles: DispatchQueue, _ dataForFile: String) {
        queue = queueForFiles
        data = dataForFile
    }

    let file = "data.json"

    func writeData() -> Bool{
        var success: Bool
        success = false
        queue.sync(flags: .barrier) {
            if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
                let fileUrl = dir.appendingPathComponent(file)
                do {
                    try self.data.write(to: fileUrl, atomically: false, encoding: .utf8)
                    success = true

                } catch {
                    print("Couldn't read the file")
                }
            }
        }
        return success
    }

    func readData() -> String? {
        var success: Bool = false
        var data: String = ""
        queue.sync(flags: .barrier) {
            if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
                let fileUrl = dir.appendingPathComponent(file)
                    do {
                        data = try String(contentsOf: fileUrl, encoding: .utf8)
                        success = true

                    } catch {
                        print("Couldn't read the file")
                    }
            }
        }
        if success {
            return data
        } else { return nil }
    }
}

class OperationDataManager {
    var data: String
    var queue: OperationQueue
    weak var operationSave: SaveOperation?

    init(_ dataForFile: String, _ queueForFiles: OperationQueue) {
        data = dataForFile
        queue = queueForFiles
    }

    func writeData() -> Bool {
        var success: Bool = true
        let operation = SaveOperation(data)
        operation.completionBlock = {
            success = operation.success
        }
        queue.addOperation(operation)
        queue.waitUntilAllOperationsAreFinished()
        return success
    }

}

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
    @IBOutlet weak var aboutUserLabel: UILabel!
    @IBOutlet weak var avatarImageView: UIImageView!
    @IBOutlet weak var changePhotoButton: UIButton!
    @IBOutlet weak var editButton: UIButton!
    @IBAction func editButton(_ sender: UIButton) {
        self.nameLabel.isHidden = true
        self.aboutUserLabel.isHidden = true
        self.editButton.isHidden = true
        self.saveAsGCDButton.isHidden = false
        self.saveAsOperationButton.isHidden = false
        self.saveAsGCDButton.isEnabled = false
        self.saveAsOperationButton.isEnabled = false
        self.aboutField.isHidden = false
        self.aboutLabel.isHidden = false
        self.usernameField.isHidden = false
        self.usernameLabel.isHidden = false
        self.changePhotoButton.isHidden = false
    }

    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var dismissButton: UIButton!
    @IBOutlet weak var saveAsOperationButton: UIButton!

    @IBAction func saveAsOperationButton(_ sender: UIButton?) {
        self.activityIndicator.startAnimating()
        let string = """
        {\"username\": \("\"" + self.usernameField.text!)\", \"about\": \("\"" + self.aboutField.text!)\"}
        """
        let queue = OperationQueue()
        let dataManager = OperationDataManager(string, queue)
        let success = dataManager.writeData()
        if success {
            self.successAlert()
        }
        else {
            self.errorAlert()
        }
        self.saveAsOperationButton.isEnabled = false
        self.saveAsGCDButton.isEnabled = false
        self.activityIndicator.stopAnimating()
        //returnToProfile()
    }

    @IBAction func saveAsGCDButton(_ sender: UIButton) {
        self.activityIndicator.startAnimating()
        let queue = DispatchQueue(label: "com.app.queue", qos: .userInitiated, attributes: .concurrent)
        let string = """
        {\"username\": \("\"" + self.usernameField.text!)\", \"about\": \("\"" + self.aboutField.text!)\"}
        """
        //let data = [["username": self.usernameField.text!], ["about": self.aboutField.text!]]
        let dataManager = GCDDataManager(queue, string)
        let success = dataManager.writeData()
        if success {
            self.successAlert()
        }
        else {
            self.errorAlert()
        }
        self.saveAsOperationButton.isEnabled = false
        self.saveAsGCDButton.isEnabled = false
        self.activityIndicator.stopAnimating()
        //returnToProfile()
    }

    func errorAlert() {
        let alert = UIAlertController(title: "Error", message: "Didn't save the data", preferredStyle: UIAlertControllerStyle.alert)

        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        alert.addAction(UIAlertAction(title: "Try Again", style: .default, handler: {action in
            self.saveAsOperationButton(nil)
        }))
        self.present(alert, animated: true, completion: nil)
    }

    func successAlert() {
        let alert = UIAlertController(title: "Data is saved", message: "", preferredStyle: UIAlertControllerStyle.alert)

        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }

    func convertToDictionary(text: String) -> [String: Any]? {
        if let data = text.data(using: .utf8) {
            do {
                return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
            } catch {
                print(error.localizedDescription)
            }
        }
        return nil
    }


    @IBOutlet weak var usernameField: UITextField!
    @IBAction func usernameFieldChanged(_ sender: UITextField) {
        self.saveAsGCDButton.isEnabled = true
        self.saveAsOperationButton.isEnabled = true
    }
    @IBOutlet weak var saveAsGCDButton: UIButton!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!
    @IBOutlet weak var aboutField: UITextView!
    @IBOutlet weak var aboutLabel: UILabel!
    @IBOutlet weak var usernameLabel: UILabel!

    var imagePicker = UIImagePickerController()

    @IBAction func changePhotoButton(_ sender: Any) {
        self.showActionSheet()
    }

    @IBAction func dismissButton(_ sender: UIButton) {
        dismiss(animated: true, completion: nil)
    }

    func returnToProfile() {
        self.activityIndicator.stopAnimating()
        self.nameLabel.isHidden = false
        self.aboutUserLabel.isHidden = false
        self.editButton.isHidden = false
        self.saveAsGCDButton.isHidden = true
        self.saveAsOperationButton.isHidden = true
        self.aboutField.isHidden = true
        self.aboutLabel.isHidden = true
        self.usernameField.isHidden = true
        self.usernameLabel.isHidden = true
        self.changePhotoButton.isHidden = true
        self.saveAsGCDButton.isEnabled = true
        self.saveAsOperationButton.isEnabled = true
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        aboutField.delegate = self

        let crossImage: UIImage = UIImage(named: "cross")!
        self.dismissButton.setImage(crossImage , for: .normal)

        let changePhotoImage: UIImage = UIImage(named: "slr-camera-2-xxl")!
        self.changePhotoButton.contentMode = .scaleAspectFit
        self.changePhotoButton.imageEdgeInsets = UIEdgeInsetsMake(15, 15, 15, 15)
        self.changePhotoButton.setImage(changePhotoImage , for: .normal)
        self.changePhotoButton.clipsToBounds = true
        self.changePhotoButton.isHidden = true

        let defaultAvatarImage: UIImage = UIImage(named: "placeholder-user")!
        self.avatarImageView.image = defaultAvatarImage
        self.avatarImageView.layer.masksToBounds = true
        self.avatarImageView.clipsToBounds = true
        self.avatarImageView.layer.cornerRadius = changePhotoButton.bounds.size.width / 2.0

        self.changePhotoButton.layer.masksToBounds = true
        self.changePhotoButton.layer.cornerRadius = changePhotoButton.bounds.size.width / 2.0

        self.editButton.layer.cornerRadius = 10
        self.editButton.layer.borderWidth = 1

        self.nameLabel.font = UIFont.boldSystemFont(ofSize: 30.0)

        self.aboutLabel.isHidden = true

        self.usernameField.isHidden = true

        self.usernameLabel.isHidden = true

        self.activityIndicator.hidesWhenStopped = true

        self.saveAsOperationButton.isHidden = true
        self.saveAsOperationButton.layer.cornerRadius = 10
        self.saveAsOperationButton.layer.borderWidth = 1

        self.saveAsGCDButton.isHidden = true
        self.saveAsGCDButton.layer.cornerRadius = 10
        self.saveAsGCDButton.layer.borderWidth = 1

        self.aboutField.isHidden = true
        self.aboutField.layer.borderWidth = 1

        let queue = DispatchQueue(label: "com.app.queue", attributes: .concurrent)
        let dataManager = GCDDataManager(queue, "")
        let string: String? = dataManager.readData()
        let data = string?.data(using: .utf8)!
        do {
            let dictionary = try JSONSerialization.jsonObject(with: data!, options : .allowFragments) as? [String : String]
            self.nameLabel.text = dictionary?["username"]
            self.aboutUserLabel.text = dictionary?["about"]
        } catch let error as NSError {
            self.nameLabel.text = "No name yet"
            self.aboutUserLabel.text = "No info yet"
            print(error)
        }
        self.aboutField.text = self.aboutUserLabel.text
        self.usernameField.text = self.nameLabel.text
    }

    func chooseFromGallery()
    {
        if UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum){
            //print("Button capture")
            imagePicker.sourceType = .photoLibrary
            self.present(imagePicker, animated: true, completion: nil)
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        self.avatarImageView.image = image
        self.dismiss(animated: true, completion: nil)
    }

    func showActionSheet() {
        imagePicker.delegate = self
        imagePicker.allowsEditing = false
        print("Choose your profile pic")

        let actionSheet = UIAlertController(title: nil, message: "Choose your profile picture", preferredStyle: .actionSheet)

        let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

        let choosePhoto = UIAlertAction(title: "Choose from galerry", style: .default) { action in
            self.imagePicker.sourceType = .photoLibrary
            self.present(self.imagePicker, animated: true, completion: nil)
            //self.chooseFromGallery()
        }

        let makePhoto = UIAlertAction(title: "Make a photo", style: .default) { action in
            self.imagePicker.sourceType = .camera
            self.present(self.imagePicker, animated: true, completion: nil)
        }

        actionSheet.addAction(choosePhoto)

        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            actionSheet.addAction(makePhoto)
        }
        else {
            print("Camera is not available")
        }

        actionSheet.addAction(cancel)

        present(actionSheet, animated: true, completion: nil)
    }
    /*
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        //во время вызова init() все объекты на view находятся в состоянии nil, именно поэтому ошибка
        //при попытке получения frame
    }*/

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func viewWillAppear(_ animated: Bool) {
        //print("Method: \(#function)")
    }

    override func viewWillDisappear(_ animated: Bool) {
        //print("Method: \(#function)")
    }

    override func viewDidAppear(_ animated: Bool) {
        print("viewDidAppear()")
        //Frame во время вызова метода viewDidAppear() отличается от frame'а во время вызова viewDidLoad() потому, что в качестве основного девайса выбран IPhone SE,
        //а приложение запущено в симуляторе IPhone 8 Plus или IPhone X, у которых отличное от SE разрешение. Именно поэтому при viewDidLoad() фрейм заранее
        //определен под основное устройство, а уже при вызове viewDidAppear() фрейм изменён под девайс, запущенный в симуляторе.

        //print("Method: \(#function)")
    }

    override func viewDidDisappear(_ animated: Bool) {
        //print("Method: \(#function)")
    }

    override func viewWillLayoutSubviews() {
        //print("Method: \(#function)")
    }

    override func viewDidLayoutSubviews() {
        //print("Method: \(#function)")
    }


}

extension ViewController: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        self.saveAsGCDButton.isEnabled = true
        self.saveAsOperationButton.isEnabled = true
    }
}

extension String {
    func toJSON() -> Any? {
        guard let data = self.data(using: .utf8, allowLossyConversion: false) else { return nil }
        return try? JSONSerialization.jsonObject(with: data, options: .mutableContainers)
    }
}