using System;
using System.Collections;

namespace Person
{
    class Program
    {
        static void Main()
        {
            Person Yo = new Person("Yo", "1.234.567-2");        // True
            Person Otro = new Person("Otro", "1.234.567-6");    // False
            Yo.IntroduceYourself();
            Console.WriteLine(Yo.IsValidID());
            Console.WriteLine(Otro.IsValidID());
        }
    }

    class Person {

        public string Name { get; set; }
        public string ID { get; set; }
        public Person(string name, string id) {
            this.Name = name;
            this.ID = id;
        }

        public void IntroduceYourself() {
            System.Console.WriteLine($"My name is {this.Name} and my ID is {this.ID}");
        }

        // Check wheter the given ID is valid or not
        public bool IsValidID() {

            int[] validationMultipliers = {2,9,8,7,6,3,4};  // given multipliers
            var multipliedList = new ArrayList();

            // loop through each char and if it's digit, multiply it by its corresponding multiplier (by index)
            // and add it to multipliedList
            int i = 0;
            foreach (char strNum in this.ID) {
                try {
                    if (Char.IsDigit(strNum)) {
                        int digit = (int)Char.GetNumericValue(strNum);
                        multipliedList.Add(lastNum(digit * validationMultipliers[i]));
                        i++;
                    }
                }
                // last digit raises outofindex, do nothing with it
                catch (System.IndexOutOfRangeException) {}
            }

            // sum all numbers from multipliedList
            int multipliedSum = 0;
            foreach (int x in multipliedList) { multipliedSum += x; }

            // check if (multipliedSum - nearest greater 10-multiple) matches with verifier digit
            // eg: if multipliedSum == 56, verifier = 60 - 54 = 6
            int verifier = 10 - (multipliedSum % 10);
            int lasDigit = (int)Char.GetNumericValue(ID[ID.Length - 1]);

            return verifier == lasDigit;
        }

        // from a given integer number, return its last digit
        public static int lastNum(int num) { return num % 10; }
    }
}