aswi2021tri-musketyri-gitlab/Server/ServerApp/DataDownload/Date.cs @ cf35739b

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

namespace ServerApp.DataDownload
{
	public class Date
	{
		public uint Month { get; }
		public uint Year { get; }
		public Date(uint month, uint year)
		{
			if (month == 0 || month > 12)
				throw new ArgumentOutOfRangeException("month", "Month must be positive and not zero and less or equal to 12.");
			this.Month = month;
			this.Year = year;
		}


		/// <summary>
		/// Increases the month by one. Increases year and sets month to 1 if need be.
		/// </summary>
		/// <returns>An increased date</returns>
		public Date IncreaseMonthByOne()
		{
			uint newMonth = Month;
			newMonth++;
			uint newYear = Year;
			if (newMonth > 12)
			{
				// newMonth must be 13
				newMonth = 1;
				newYear++;
			}

			return new Date(newMonth, newYear);
		}

		/// <summary>
		/// Parses the date given in format: 1-2020
		/// </summary>
		/// <param name="str">The string to parse</param>
		/// <returns>A new date</returns>
		public static Date ParseDate(string str)
		{

			uint month, year;

			string ds = str.Trim();
			string[] splits = ds.Split('-');

			if(splits.Length != 2)
			{
				Console.WriteLine("Unknown date format. Must be e.g. 1-2020.");
				return null;
			}

			bool monthOk = uint.TryParse(splits[0], out month);
			bool yearOk = uint.TryParse(splits[1], out year);

			if(!monthOk || !yearOk)
			{
				Console.WriteLine("Unknown date format. Must be e.g. 1-2020.");
				return null;
			}


			try
			{
				Date d = new Date(month, year);
				return d;
			}
			catch (Exception ex)
			{
				return null;
			}
			

			return null;
		}


		#region OVERRIDEN METHODS FOR OF THE OBJECT CLASS
		public override bool Equals(object obj)
		{
            if (obj is null)
            {
                return false;
            }

            if (obj.GetType() != typeof(Date))
				return false;

			Date other = obj as Date;
			if (other.Month == this.Month && other.Year == this.Year)
				return true;
			return false;
		}

		public override int GetHashCode()
		{
			int hashCode = -994906903;
			hashCode = hashCode * -1521134295 + Month.GetHashCode();
			hashCode = hashCode * -1521134295 + Year.GetHashCode();
			return hashCode;
		}

		public override string ToString()
		{
			string mon = Month > 9 ? $"{Month}" : "0" + Month;
			return $"{mon}-{Year}";
		}

		#endregion

		#region OVERLOADED OPERATORS
		public static bool operator >(Date d1, Date d2)
		{
			if (d1.Year > d2.Year)
				return true;
			else if (d1.Year < d2.Year)
				return false;
			else
			{
				// the years are equal
				if (d1.Month > d2.Month)
					return true;
				else return false;
			}

		}

		public static bool operator <(Date d1, Date d2)
		{
			return !(d1 >= d2);
		}


		public static bool operator >=(Date d1, Date d2)
		{
			if (d1.Year > d2.Year)
				return true;
			else if (d1.Year < d2.Year)
				return false;
			else
			{
				// the years are equal
				if (d1.Month > d2.Month)
					return true;
				else if (d1.Month == d2.Month)
					return true;
				else return false;
			}
		}

		public static bool operator <=(Date d1, Date d2)
		{
			return !(d1 > d2);
		}

		//public static bool operator ==(Date d1, Date d2)
		//{
		//	return d1.Equals(d2);
		//}

		//public static bool operator !=(Date d1, Date d2)
		//{
		//	return !d1.Equals(d2);
		//}

		#endregion
	}
}