TNETAmountTextFieldView

TNETAmountTextFieldView.swift

//
//  TNETDebtView.swift
//  
//
//  Created by Tornike on 15/06/2023.
//

import Foundation
import UIKit
import Domain
import DesignSystem

public class TNETAmountTextFieldView: UIView {
  public typealias OnValueChange = ((CGFloat) -> Void)

  private var debtAmount: UtilityPayments.Template.AmountInfo?

  // MARK: Views
  private lazy var wrapperView: UIView = {
    let view = UIView(frame: .zero)
    view.backgroundColor = .white
    return view
  }()

  private lazy var rightGrayView: UIView = {
    let view = UIView(frame: .zero)
    view.backgroundColor = UIColor[.gray7]
    return view
  }()

  private lazy var textField: UITextField = {
    let view = UITextField(frame: .zero)
    view.font = .buttonBold
    view.textColor = UIColor[.text1]
    view.textAlignment = .center
    view.delegate = self
    view.text = "0"
    view.keyboardType = .decimalPad
    return view
  }()

  private lazy var debtLabel: UILabel = {
    var view = UILabel(frame: .zero)
    view.font = .tbcx(size: 10.0, weight: .regular, relativeTo: .body)
    view.numberOfLines = 1
    view.minimumScaleFactor = 0.9
    view.textAlignment = .center
    view.adjustsFontSizeToFitWidth = true
    return view
  }()

  public var onValueChanged: OnValueChange?

  override public init(frame: CGRect) {
    super.init(frame: frame)
    setup()
    bind()
    layout()
  }

  @available(*, unavailable)
  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  public override func layoutSublayers(of layer: CALayer) {
    super.layoutSublayers(of: layer)
    wrapperView.layer.borderColor = UIColor[.gray3].cgColor
    wrapperView.layer.borderWidth = 1
    wrapperView.apply(cornerRadius: .fixed(corners: .allCorners, value: 8.0))
  }

  public func clearDebt(force: Bool) {
    guard let debtInfo = debtAmount, debtInfo.isDebt else {
      return
    }

    let debtValue = debtInfo.asDouble

    guard debtValue != 0 else {
      return
    }

    if textField.text?.doubleValue ?? 0.0 > 0 && !force {
      return
    }

    textField.text = debtInfo.debt
    debtTextFieldDidUpdate(with: debtInfo.debt)
  }

  public func resetDebt() {
    let value: CGFloat = debtAmount?.asDouble ?? 0.00
    updateDebt(with: value)
    textField.text = ""
  }

  public func setDebt(amountInfo: UtilityPayments.Template.AmountInfo) {
    debtAmount = amountInfo
    debtLabel.text = "\(amountInfo.displayText)₾"

    configureDebtLabel(amountInfoType: amountInfo.amountType)
  }

  private func setup() {
    addSubview(wrapperView)
    wrapperView.addSubview(textField)
    wrapperView.addSubview(rightGrayView)
    rightGrayView.addSubview(debtLabel)
  }

  private func bind() {
    textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)
    setupRightViewGestureRecognizer()
  }

  private func layout() {
    wrapperView.snp.remakeConstraints { make in
      make.edges.equalToSuperview()
    }

    textField.snp.remakeConstraints { make in
      make.leading.equalToSuperview().offset(CGFloat.spacing8)
      make.top.equalToSuperview()
      make.bottom.equalToSuperview()
      make.trailing.equalTo(rightGrayView.snp.leading).offset(-CGFloat.spacing8)
    }

    rightGrayView.snp.remakeConstraints { make in
      make.top.bottom.trailing.equalToSuperview()
      make.width.equalTo(65.0.scaledWidth)
    }

    debtLabel.snp.remakeConstraints { make in
      make.top.leading.equalTo(4.0)
      make.bottom.trailing.equalTo(-4.0)
    }
  }

  private func setupRightViewGestureRecognizer() {
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(debtGreyViewDidTap))
    rightGrayView.addGestureRecognizer(tapGestureRecognizer)
  }

  private func configureDebtLabel(amountInfoType: UtilityPayments.Template.AmountInfo.AmountType) {
    switch amountInfoType {
    case .negative:
      debtLabel.textColor = UIColor[.error]
    case .positive:
      debtLabel.textColor = UIColor[.success]
    case .zero:
      debtLabel.textColor = UIColor[.text1]
    }
  }

  private func updateDebt(with newAmount: CGFloat) {
    debtLabel.text = "\(newAmount)₾"
  }

  private func debtTextFieldDidUpdate(with value: String) {
    let amountWithoutCurrency = value.isEmpty ? "0" : value
    guard let amountInfo = debtAmount else {
      return
    }

    guard let amountValue = amountWithoutCurrency.doubleValue else {
      resetDebt()
      return
    }

    var newUpdatedDebt: Double = amountInfo.asDouble - amountValue

    if newUpdatedDebt != .zero {
      newUpdatedDebt *= -1.0
    }

    let formatted: Double = newUpdatedDebt.roundToDecimal(2)
    dump(formatted)
    updateDebt(with: formatted)

    configureDebtLabel(
      amountInfoType: UtilityPayments.Template.AmountInfo.getAmountType(by: newUpdatedDebt)
    )

    onValueChanged?(formatted)
  }

  @objc private func debtGreyViewDidTap() {
    clearDebt(force: true)
  }

  @objc private func textFieldDidChange(_ textField: UITextField) {
    let textFieldValue = textField.text ?? ""
    debtTextFieldDidUpdate(with: textFieldValue)
  }
}

extension TNETAmountTextFieldView: UITextFieldDelegate {
  public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    var currentText = textField.text ?? ""
    var replacementString = string
    replacementString = replacementString.replaceCommaWithDot()
    currentText = currentText.replaceCommaWithDot()
    textField.text = currentText
    return true
  }
}

extension Double {
  func roundToDecimal(_ fractionDigits: Int) -> Double {
    let multiplier = pow(10, Double(fractionDigits))
    return Darwin.round(self * multiplier) / multiplier
  }
}