EditViewController.swift

//
//  ViewController.swift
//  Note
//
//  Created by Максим Бачурин on 20/06/2019.
//  Copyright © 2019 Максим Бачурин. All rights reserved.
//

import UIKit
import CocoaLumberjack

class EditViewController: UIViewController {

    @IBOutlet weak var miniColorPickerButton: UIButton!
    @IBOutlet weak var mainView: UIView!
    @IBOutlet var colorButtons: [UIButton]!
    @IBOutlet weak var colorPickerView: ColorPickerView!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var stackColors: UIStackView!
    @IBOutlet weak var datePickerHeightConstraint: NSLayoutConstraint!
    @IBOutlet weak var destoyDatePicker: UIDatePicker!
    private var checkMarkView: CheckMarkView?
    var note: Note?
    @IBOutlet weak var titleTextView: UITextField!
    @IBOutlet weak var contentTextView: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()
        colorPickerView.delegate = self
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        initializeDatePicker()
        initializeColorButtons()
        initializeCheckMarkView()
        addObservers()
        initializeData()
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(didTapView(_:)))
        view.addGestureRecognizer(tapGesture)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        removeObservers()
        saveNote()
    }

    func saveNote() {
        for notesTableViewController in navigationController?.viewControllers ?? [] {
            if let notesTableViewController = notesTableViewController as? NotesTableViewController {
                notesTableViewController.notebook.remove(with: note!.uid)
                notesTableViewController.notebook.add(Note(importance: note!.importance,
                                                           uid: note!.uid,
                                                           color: mainView.backgroundColor!,
                                                           title: titleTextView.text ?? "",
                                                           content: contentTextView.text ?? "",
                                                           dateDestruction: note!.dateDestruction))
                notesTableViewController.tableView.reloadData()
                notesTableViewController.notebook.saveToFile()
                return
            }
        }
    }

    func initializeDatePicker() {
        datePickerHeightConstraint.constant = 0
        destoyDatePicker.locale = Locale(identifier: "ru_RU")
    }

    func initializeData() {
        guard let note = note else {
            print("Note is not found")
            return
        }
        titleTextView.text = note.title
        contentTextView.text = note.content
    }

    func initializeCheckMarkView() {
        if note == nil {
            for button in colorButtons {
                if button.backgroundColor!.isEqual(UIColor.white) {
                    installCheckMark(to: button)
                    break
                }
            }
        } else {
            for button in colorButtons {
                if button.backgroundColor == nil {
                    mainView.backgroundColor = note!.color
                    scrollView.backgroundColor = note!.color
                    miniColorPickerButton.setImage(nil, for: .normal)
                    installCheckMark(to: button)
                } else {
                    if button.backgroundColor!.isEqual(note!.color) {
                        mainView.backgroundColor = note!.color
                        scrollView.backgroundColor = note!.color
                        installCheckMark(to: button)
                        return
                    }
                }
            }
        }
    }

    func initializeColorButtons() {
        for button in colorButtons {
            if button.backgroundColor == nil {
                let longPressGestureRecognizer = UILongPressGestureRecognizer(target: self,
                                                                              action: #selector(showColorPicker(_:)))
                button.addGestureRecognizer(longPressGestureRecognizer)
            }
            button.clipsToBounds = true
            button.layer.cornerRadius = button.frame.size.width/8
            button.layer.borderColor = UIColor.black.cgColor
            button.layer.borderWidth = 1
            button.addTarget(self, action: #selector(chooseColor(_:)), for: .touchUpInside)
        }
        colorButtons[0].backgroundColor = .white
        colorButtons[1].backgroundColor = .green
        colorButtons[2].backgroundColor = .red
    }

    //MARK: - Actions
    @IBAction func switchChanged(_ sender: UISwitch) {
        datePickerHeightConstraint.constant = 216*(sender.isOn ? 1 : 0)
        destoyDatePicker.minimumDate = Date()
    }

    //MARK: - Selectors
    @objc func chooseColor(_ sender: UIButton) {
        if sender.backgroundColor == nil {
            return
        }
        mainView.backgroundColor = sender.backgroundColor
        scrollView.backgroundColor = sender.backgroundColor

        installCheckMark(to: sender)
    }

    @objc func showColorPicker(_ sender: UILongPressGestureRecognizer) {
        scrollView.isHidden = true
    }

    @objc func didTapView(_ gesture: UITapGestureRecognizer) {
        view.endEditing(true)
    }

    func installCheckMark(to currentView: UIView) {
        checkMarkView?.removeFromSuperview()
        checkMarkView = CheckMarkView(frame: CGRect(x: 0,
                                                    y: 0,
                                                    width: currentView.bounds.width/3,
                                                    height: currentView.bounds.height/3))
        currentView.addSubview(checkMarkView!)
    }

    //MARK: - Keyboard
    @objc func keyboardWillShow(notification: Notification) {
        guard let userInfo = notification.userInfo,
            let frame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else {
                return
        }
        let contentInset = UIEdgeInsets(top: 0, left: 0, bottom: frame.height, right: 0)
        scrollView.contentInset = contentInset
    }

    @objc func keyboardWillHide(notification: Notification) {
        scrollView.contentInset = UIEdgeInsets.zero

    }

    //MARK: - Observers
    func addObservers() {
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
    }

    func removeObservers() {
        NotificationCenter.default.removeObserver(self)
    }

}

extension EditViewController: ColorPickerDelegate {
    func newColor(sender: ColorPickerView, color: UIColor) {
        scrollView.isHidden = false;
        mainView.backgroundColor = color
        scrollView.backgroundColor = color
        miniColorPickerButton.setImage(nil, for: .normal)
        miniColorPickerButton.backgroundColor = color
        installCheckMark(to: miniColorPickerButton)
    }
}