using System;

using System.Collections.Generic;

​

namespace FlagInformationSystem

{

    class Flag

    {

        #region Constructors

        public Flag(string country, string ratio, int yearCurrentFlag, string colors, long gdp, long population, DateTime dateOfIndependence)

        {

            Country = country;

            Ratio = ratio;

            YearCurrentFlag = yearCurrentFlag;

            Colors = colors;

​

            GDP = gdp;

            Population = population;

​

            DateOfIndependence = dateOfIndependence;

​

            Guid = Guid.NewGuid();

        }

​

        public Flag(string country, string ratio, int yearCurrentFlag, string colors, long gdp, long population, DateTime dateOfIndependence, Guid guid)

            : this(country, ratio, yearCurrentFlag, colors, gdp, population, dateOfIndependence)

        {

            Guid = guid;

        }

​

        public Flag(Flag other)

            : this(other.Country, other.Ratio, other.YearCurrentFlag, other.Colors, other.GDP, other.Population, other.DateOfIndependence)

        {

            Guid = other.Guid;

        }

​

        #endregion

​

        #region Methods

        public void Print()

        {

            Console.WriteLine($"Id = {Guid}");

            Console.WriteLine($"The flag of {Country}, a {ModernCountryAge} year old country with a GDP per capita of around ${CalculateGDPCapita()}, has a ratio of {Ratio}; the current iteration being made in {YearCurrentFlag}. It uses the colours {Colors}.");

            Console.WriteLine();

        }

        public double CalculateGDPCapita()

        {

            if (Population == 0) return 0;

            return GDP / Population;

        }

​

        #endregion

​

        #region Properties

        public string Country { get; set; }

        public string Ratio { get; set; }

        public int YearCurrentFlag { get; set; }

        public string Colors { get; set; }

​

        public long GDP { get; set; }

        public long Population { get; set; }

​

        public DateTime DateOfIndependence { get; }

        public int ModernCountryAge 

        {

            get

            {

                return (int)(DateTime.Today - DateOfIndependence).TotalDays / 365;

            }

        }

        public Guid Guid { get; }

        #endregion

    }

​

    class Program

    {

        static void Main(string[] args)

        {

            List<Flag> flags = new List<Flag>();

​

            var switzerland = new Flag("Switzerland", "1:1", 1841, "Red and White", 705100000000, 8545000, DateTime.Parse("9/12/1848"));

            flags.Add(switzerland);

​

            var germany = new Flag("Germany", "3:5", 1949, "Red, Yellow and Black", 3948000000000, 83020000, DateTime.Parse("10/3/1990"));

            flags.Add(germany);

​

            var japan = new Flag("Japan", "2:3", 1999, "Red and White", 4971000000000, 126500000, DateTime.Parse("5/3/1947"));

            flags.Add(japan);

​

            var russia = new Flag("Russia", "2:3", 1700, "Red, Blue and White", 1658000000000, 144500000, DateTime.Parse("12/12/1993"));

            flags.Add(russia);

​

            var russia2 = new Flag(russia);

            flags.Add(russia2);

​

            for (int i = 0; i < flags.Count; i++)

            {

                flags[i].Print();

            }

        }

    }

}