namespace utility
{
    using Console = System.Console;
    /// <summary>
    /// A class that implements the Date interface.
    /// </summary>
    public class DateImpl:Date
    {
        private int iYear;
        private int iMonth;
        private int iDay;
        private static int iCount;
        public static int Count
        {
            get 
            {
                return iCount;
            }
            set
            {
                iCount = value;
            }
        }
        public DateImpl(int pYear, int pMonth, int pDay)
        {
            iYear  = pYear;
            iMonth = pMonth;
            iDay   = pDay;
            // Console.WriteLine(iYear*10000+iMonth*100+iDay);
        }
        public DateImpl(string pDateString)
        {
            string[] tokens = pDateString.Split(new char[] {'-'});
            if (tokens.Length==3)
            {            
                iYear  = int.Parse(tokens[0]);
                iMonth = int.Parse(tokens[1]);
                iDay   = int.Parse(tokens[2]);
            }
            else 
            {
                throw new System.ArgumentException("two hyphens expected");
            }
        }
        public int Year
        {
            get 
            {
                return iYear;
            }
            set
            {
                iYear = value;
            }
        }
        public int Month
        {
            get 
            {
                return iMonth;
            }
            set
            {
                iMonth = value;
            }
        }
        public int Day
        {
            get 
            {
                return iDay;
            }
            set
            {
                iDay = value;
            }
        }
        public override bool Equals(object pObject)
        {
            iCount++;
            DateImpl tDateImpl = (DateImpl)pObject;
            return 
                this.iYear  == tDateImpl.iYear  &&
                this.iMonth == tDateImpl.iMonth &&
                this.iDay   == tDateImpl.iDay;            
        }
        public override int GetHashCode()
        {
            Console.WriteLine(iYear*10000+iMonth*100+iDay);
            return iYear*10000+iMonth*100+iDay;
        }
        public int CompareTo(object pObject)
        {
            return 0;
        }
        public override string ToString()
        {
            return Year + "-" + Month/10 + Month%10 
                        + "-" +   Day/10 +   Day%10;
        }
    }
}