//
//  CurrencyTextField.swift
//  WorkingWithCurrencies
//
//  Created by Josh R on 9/8/20.
//  Copyright © 2020 Josh R. All rights reserved.
//

import UIKit

class CurrencyTextField: UITextField {
    
    var currencyType: String?
    var passTextFieldText: ((String) -> Void)?
    var didTextFieldEndEditing: ((String) -> Void)?
    var keyBoardType: UIKeyboardType = .default
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        //If using in SBs
        setup()
    }
    
    private func setup() {
        self.keyboardType = keyBoardType
        self.contentScaleFactor = 0.5
        delegate = self
        
        self.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
    }
    
    //AFTER entered string is registered in the textField
    @objc private func textFieldDidChange() {
        updateTextField()
    }
    
    //Placed in separate method so when the user selects an account with a different currency, it will immediately be reflected
    private func updateTextField() {
        var cleanedAmount = ""
        for character in self.text ?? "" {
            if character.isNumber {
                cleanedAmount.append(character)
            }
        }
        
        self.text = getCommaLike3DigitMoneytext(cleanedAmount)
        passTextFieldText?(self.text!)
    }
        
     func getCommaLike3DigitMoneytext( _ amount: String) -> String {
        var numberOfArrayOfString: [Character] = []
        var numbero3DigitsString: [String] = []
        let textArray = Array(amount)
        for (i, value) in textArray.enumerated() {
            if let lastElement = textArray.elementAt(index:( textArray.count - 1) - i) {
                numberOfArrayOfString.append(lastElement)
            }
        }
        
        var concanetedText = ""
        for (i, value) in numberOfArrayOfString.enumerated() {
            let currentIndex = (textArray.count - 1) - i
            if(currentIndex % 3 != 0) {
                if let text = numberOfArrayOfString.elementAt(index: currentIndex) {
                    concanetedText =  concanetedText + String(text)
                }
            } else {
                if let text = numberOfArrayOfString.elementAt(index: currentIndex) {
                    concanetedText = concanetedText +  String(text)
                    numbero3DigitsString.append(concanetedText)
                    concanetedText = ""
                }
            }
        }
        
        return numbero3DigitsString.joined(separator: ",")
    }
}


extension CurrencyTextField: UITextFieldDelegate {
        
    func textFieldDidEndEditing(_ textField: UITextField) {
        let  parsedText = textField.text?.replacingOccurrences(of:  currencyType ?? "", with: "") ?? ""
        textField.text = parsedText + (currencyType ?? "")
        didTextFieldEndEditing?(textField.text ?? "")
    }
    
    func textFieldDidBeginEditing(_ textField: UITextField) {
        let  parsedText = textField.text?.replacingOccurrences(of:  currencyType ?? "", with: "") ?? ""
        textField.text = parsedText
    }
}