ایجاد شناسه قبض و شناسه پرداخت در CSharp

 1using System.Globalization;
 2using System.Numerics;
 3
 4namespace BillNum
 5{
 6    /// <summary>
 7    /// تولید شناسه قبض و شناسه پرداخت
 8    /// </summary>
 9    public static class BillGenerator
10    {
11        private const int MinWeight = 2;
12        private const int MaxWeight = 7;
13
14        /// <summary>محاسبه شناسه قبض</summary>
15        /// <param name="directoryCode">شماره پرونده</param>
16        /// <param name="companyCode">کد شرکت</param>
17        /// <param name="billType">نوع قبض</param>
18        /// <returns></returns>
19        public static string GenerateBillId(string directoryCode, string companyCode, string billType)
20        {
21            ValidateNumeric(directoryCode, 1, 8, nameof(directoryCode), out _);
22            ValidateNumeric(companyCode, 3, 3, nameof(companyCode), out _);
23            ValidateNumeric(billType, 1, 1, nameof(billType), out _);
24
25            var billId = BigInteger.Parse($"{directoryCode}{companyCode}{billType}");
26            var digitCode = CalculateCheckDigit(billId);
27
28            return AppendCheckDigit(billId, digitCode);
29        }
30
31        /// <summary>محاسبه شناسه پرداخت</summary>
32        /// <param name="amount">مبلغ</param>
33        /// <param name="yearCode">کد سال</param>
34        /// <param name="termCode">کد دوره</param>
35        /// <param name="billId">شناسه قبض</param>
36        /// <returns></returns>
37        public static string GeneratePaymentId(string amount, string yearCode, string termCode, string billId)
38        {
39            ValidateNumeric(amount, 1, 11, nameof(amount), out var amountLong);
40            ValidateNumeric(yearCode, 1, 1, nameof(yearCode), out _);
41            ValidateNumeric(termCode, 2, 2, nameof(termCode), out _);
42            ValidateNumeric(billId, 13, 13, nameof(billId), out _);
43
44            var paymentId = BigInteger.Parse($"{amountLong / 1000}{yearCode}{termCode}");
45            var digitCode = CalculateCheckDigit(paymentId);
46            var paymentIdWithDigit = AppendCheckDigit(paymentId, digitCode);
47            var combined = BigInteger.Parse($"{billId}{paymentIdWithDigit}");
48            var finalDigit = CalculateCheckDigit(combined);
49
50            return AppendCheckDigit(BigInteger.Parse(paymentIdWithDigit), finalDigit);
51        }
52
53        private static string AppendCheckDigit(BigInteger inputCode, int digitCode)
54        {
55            var needsAdjustment = digitCode > 1;
56            var result = needsAdjustment
57                ? inputCode * 10 + (11 - digitCode)
58                : inputCode * 10;
59
60            return result.ToString(CultureInfo.InvariantCulture);
61        }
62
63        private static int CalculateCheckDigit(BigInteger inputCode)
64        {
65            var weight = MinWeight;
66            var sum = 0;
67            var temp = inputCode;
68
69            while (temp != 0)
70            {
71                sum += (int)(temp % 10 * weight);
72                temp /= 10;
73                weight = weight == MaxWeight ? MinWeight : weight + 1;
74            }
75
76            return sum % 11;
77        }
78
79        private static void ValidateNumeric(string value, int minLength, int maxLength, string paramName,
80            out ulong result)
81        {
82            if (!ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out result)
83                || value.Length < minLength || value.Length > maxLength)
84                throw new ArgumentException($"The {paramName} is invalid.", paramName);
85        }
86    }
87}