pinfl_generator

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using System;
using System.Collections.Generic;
using System.Linq;

public class HelloWorld
{
    public static void Main(string[] args)
    {
        var dates = GenerateRandomBirthdates(20, 21, 60);
        foreach(var date in dates)
        {
            var pinfl =  FakeGeneratorPinfl(date);
            Console.WriteLine($"BithDate: {date.ToString("yyyy-MM-dd")} - PINFL: {pinfl}");
        }
    }

    public static List<DateTime> GenerateRandomBirthdates(int count, int minAge, int maxAge)
    {
        List<DateTime> birthdates = new List<DateTime>();
        Random random = new Random();

        for (int i = 0; i < count; i++)
        {
            int daysOld = random.Next(minAge * 365, maxAge * 365); // Convert age to days
            birthdates.Add(DateTime.Today.AddDays(-daysOld));
        }

        return birthdates;
    }

    public static string FakeGeneratorPinfl(DateTime birthDate)
    {
        var random = new Random();
        var gender = (Gender)random.Next(0, 2);

        List<int> multipliers = new List<int> { 7, 3, 1, 7, 3, 1, 7, 3, 1, 7, 3, 1, 7 };

        int firstDigit;
        if (birthDate.Year >= 1900 && birthDate.Year <= 1999)
        {
            firstDigit = gender == Gender.Male ? 3 : 4;
        }
        else if (birthDate.Year >= 2000 && birthDate.Year <= 2099)
        {
            firstDigit = gender == Gender.Male ? 5 : 6;
        }
        else
        {
            throw new ArgumentOutOfRangeException(nameof(birthDate), "Year must be between 1900 and 2099");
        }

        // Convert date to PINFL part
        var birthDateDigits = birthDate.ToString("ddMMyy").Select(c => c - '0').ToList();

        // Generate 6 random digits
        var randomDigits = new List<int>();
        for (int i = 0; i < 6; i++)
        {
            randomDigits.Add(random.Next(0, 10));
        }

        // Combine all parts
        List<int> pinfl = new List<int> { firstDigit };
        pinfl.AddRange(birthDateDigits);
        pinfl.AddRange(randomDigits);

        // Calculate control digit
        int sum = 0;
        for (int i = 0; i < 13; i++)
        {
            sum += pinfl[i] * multipliers[i];
        }
        int controlDigit = sum % 10;

        // Append control digit
        pinfl.Add(controlDigit);

        return string.Join("", pinfl);
    }

        public enum Gender
        {
            Female =0,
            Male = 1
        }
}