2018_OOP_Person_Static_Elements

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WorldMI
{
  class Person
  {
    private string name;
    private int age;
    private decimal balance;
    private string[] friends;
    private static int counter = 0;
    public const double PI = 3.14 * 2;
    public static readonly double only4Read = 2.71;

    public static int Counter
    {
      get { return counter; }
    }


    public string this[int i]
    {
      get { return friends[i]; }
      set { friends[i] = value; }
    }

    public string Name
    {
      get { return name; }
      set { name = value; }
    }

    public int Age
    {
      get { return age; }
      set {
        if (value > 120 || value < 0) value = 0;
        age = value;
      }
    }

    static Person()
    {
      only4Read = 546;
    }
    public Person()
      :this("Default", 0)
    {
      //this.name = "Default";
      //this.age = 0;
    }

    // working horse
    public Person(string name, int age, decimal balance = 0.0M, params string[] friends)
    {
      this.name = name;
      this.age = age;
      this.balance = balance;
      this.friends = friends;
      counter++;
      // only4Read = age * 111;
    }

    public Person(int age, string name)
      :this(name, age)
    {
      //this.name = name;
      //this.age = age;
    }

    //public string GetName()
    //{
    //  return name;
    //}

    //public void SetName(string name)
    //{
    //  this.name = name;
    //}

    //public int GetAge()
    //{
    //  return age;
    //}

    //public void SetAge(int age)
    //{
    //  if(age > 120 || age < 0)
    //  {
    //    age = 0;
    //  }
    //  this.age = age;
    //}

    public void IntroduceYourSelf()
    {
      Console.WriteLine("My name is {0}. I am {1} years old! Last year I was {2} years old!", name, age, GetLastYearAge(age));
      CalculateNationalIncome();
    }

    private int GetLastYearAge(int age)
    {
      return age - 1;
    }

    public static double CalculateNationalIncome()
    {
      return counter * 1000;
    }

  }
}