using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;


namespace OSS.Models
{
    public class ExchangeRate
    {
        public int Id { get; set; }
        public string Currency { get; set; }
        public string CurrencyDesc { get; set; }
        public decimal Rate { get; set; }

        public string ToString(){
            return Currency+" "+Rate;
        }
    }

    public class CurrencyUtils
    {
        private static readonly string[] ones = { "", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };
        private static readonly string[] teens = { "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" };
        private static readonly string[] tens = { "", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" };

        public static string ToWords(decimal number)
        {
            if (number == 0)
                return "Zero";

            // Split the number into integer and fractional parts
            int integerPart = (int)Math.Floor(number);
            int fractionalPart = (int)((number - integerPart) * 100);

            // Convert integer part to words
            string integerWords = ConvertIntegerToWords(integerPart);

            // Convert fractional part to words
            string fractionalWords = ConvertFractionalToWords(fractionalPart);

            // Combine the words for integer and fractional parts
            string result = integerWords + (fractionalWords != null? " and " + fractionalWords : "");

            return result.Trim();
        }

        private static string ConvertIntegerToWords(int number)
        {
            if (number < 10)
                return ones[number];

            if (number < 20)
                return teens[number - 10];

            if (number < 100)
                return tens[number / 10] + " " + ones[number % 10];

            if (number < 1000)
                return ones[number / 100] + " Hundred " + ConvertIntegerToWords(number % 100);

            if (number < 1000000)
                return ConvertIntegerToWords(number / 1000) + " Thousand " + ConvertIntegerToWords(number % 1000);

            if (number < 1000000000)
                return ConvertIntegerToWords(number / 1000000) + " Million " + ConvertIntegerToWords(number % 1000000);

            return "Number out of range";
        }

        private static string ConvertFractionalToWords(int number)
        {
            if (number == 0)
                return null;

            if (number < 10)
                return ones[number] + " Cents";

            if (number < 20)
                return teens[number - 10] + " Cents";

            return tens[number / 10] + " " + ones[number % 10] + " Cents";
        }
    }
}