Money.swift

import Foundation

enum CurrencyPosition {
    case left
    case right
    case none
}

class Money {
    // Properties
    private var amount: Decimal
    private var currencyCode: String
    private var currencyPosition: CurrencyPosition

    // Initializer
    init(amount: Decimal, currencyCode: String, currencyPosition: CurrencyPosition = .right) {
        self.amount = amount
        self.currencyCode = currencyCode
        self.currencyPosition = currencyPosition
    }

    // Methods

    // Convert and format money in a different currency
    func convert(to newCurrency: String) -> Money {
        // Implement currency conversion logic here
        // You may need to fetch exchange rates from an external source
        // and perform the conversion
        // Ensure the new currency is supported
        return Money(amount: convertedAmount, currencyCode: newCurrency, currencyPosition: currencyPosition)
    }

    // Format money with a specified format
    func format(decimalDigits: Int = 2) -> String {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.currencyCode = currencyCode
        formatter.maximumFractionDigits = decimalDigits

        var formattedAmount = formatter.string(from: amount as NSDecimalNumber) ?? ""
        
        switch currencyPosition {
        case .left:
            break // Currency code is on the left by default
        case .right:
            formattedAmount = formattedAmount.replacingOccurrences(of: currencyCode, with: "").trimmingCharacters(in: .whitespaces)
        case .none:
            formattedAmount = formattedAmount.replacingOccurrences(of: currencyCode, with: "").trimmingCharacters(in: .whitespaces)
        }
        
        return formattedAmount
    }

    // Display the money as a formatted string
    func display(decimalDigits: Int = 2) -> String {
        return format(decimalDigits: decimalDigits)
    }
}

// Example usage:
let moneyLeftCurrency = Money(amount: 100.50, currencyCode: "USD", currencyPosition: .left)
let moneyRightCurrency = Money(amount: 88.1775, currencyCode: "EUR")
let moneyNoCurrency = Money(amount: 1234.5678, currencyCode: "JPY", currencyPosition: .none)
let money2Digits = Money(amount: 456.78, currencyCode: "GBP", currencyPosition: .left)
let money3Digits = Money(amount: 789.123, currencyCode: "CAD", currencyPosition: .left)
let money4Digits = Money(amount: 123.4567, currencyCode: "AUD", currencyPosition: .left)

print(moneyLeftCurrency.format())   // Outputs: "USD 100.50"
print(moneyRightCurrency.format())  // Outputs: "88.1775 EUR"
print(moneyNoCurrency.format())     // Outputs: "1234.5678"
print(money2Digits.format())        // Outputs: "GBP 456.78"
print(money3Digits.format())        // Outputs: "CAD 789.123"
print(money4Digits.format())        // Outputs: "AUD 123.4567"