//
//  MinusKeyPadTextField.swift
//  DecimalMinusDemo
//
//  Created by MinjunJu on 06/08/2019.
//  Copyright © 2019 Jonathan Engelsma. All rights reserved.
//

import UIKit

final class MinusKeypadTextField: UITextField {
    private let accessContainerView = UIView().then {
        $0.backgroundColor = .blue
        $0.frame = UI.accessContainerViweFrame
    }

    private let minusButton = UIButton().then {
        $0.setTitle("-", for: .normal)
        $0.setTitleColor(.white, for: .normal)
        $0.frame = UI.minusButtonFrame

    }

    private let doneButton = UIButton().then {
        $0.setTitle("확인", for: .normal)
        $0.setTitleColor(.white, for: .normal)
        $0.frame = UI.doneButtonFrame
    }

    var _accessContainerViewBackgroundColor: UIColor = .gray

    var accessBackgroundColor: UIColor {
        get { return _accessContainerViewBackgroundColor }
        set {
            _accessContainerViewBackgroundColor = newValue
            accessContainerView.backgroundColor = newValue
        }
    }


    enum UI {
        static let accessContainerViweFrame = CGRect(
            x: 0,
            y: 0,
            width: UIScreen.mainWidth,
            height: 44.dynamicHeight
        )
        static let minusButtonFrame = CGRect(
            x: 0,
            y: 0,
            width: (UIScreen.mainWidth / 3).r,
            height: 44.dynamicHeight
        )
        static let doneButtonFrame = CGRect(
            x: UIScreen.mainWidth - (UIScreen.mainWidth / 3).r ,
            y: 0,
            width: (UIScreen.mainWidth / 3).r,
            height: 44.dynamicHeight
        )
    }

    init(keyboardType innerKeyboardType: UIKeyboardType = .numberPad, frame: CGRect = .zero) {
        super.init(frame: frame)

        // 아직 각 키보드 타입에 따른 대응 미 대응
        switch innerKeyboardType {
        case .`default`, .asciiCapable, .numbersAndPunctuation, .URL, .numberPad, .phonePad,
             .namePhonePad, .emailAddress, .decimalPad, .twitter, .webSearch, .asciiCapableNumberPad:
            keyboardType = .numberPad
        @unknown default:
            print("뭐지..")
        }
        setupUI()
        setupBinding()
    }

    override func draw(_ rect: CGRect) {
        super.draw(rect)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupUI() {
        accessContainerView.backgroundColor = accessBackgroundColor
        accessContainerView.addSubviews(minusButton, doneButton)
        inputAccessoryView = accessContainerView
    }

    private func setupBinding() {
        minusButton.addTarget(self, action: #selector(minusButtonAction(_:)), for: .touchUpInside)
        doneButton.addTarget(self, action: #selector(doneButtonAction(_:)), for: .touchUpInside)
    }

    @objc func minusButtonAction(_ sender: UIButton) {
        guard let text = text else {
            print("올수없음")
            return
        }

        switch text.count > 0 {
        case true:
            let index: String.Index = text.index(text.startIndex, offsetBy: 1)
            let firstChar = text[..<index]
            switch firstChar == "-" {
            case true:  self.text = String(text[index...])
            case false: self.text = "-" + text
            }
        case false:
            break
        }
    }

    @objc func doneButtonAction(_ sender: UIButton) {
        resignFirstResponder()
    }
}