using System.ComponentModel.DataAnnotations;

namespace Core.Entities;
public class Team
{
    public int Id { get; set; }

	[Required]
    [Display(Name = "Team Name")]
    public string Name { get; set;  }
    public EventDefinition Event { get; set; }
    public List<Student> Students { get; set; } = [];

    public Student? Captain { get; set;  }

    [Display(Name = "Team Id")]
    public string? TeamId { get; set; }

    //public string? RegionalTimeSlot { get; set; }


 //   public Tuple<DateTime,DateTime?>? RegionalTimeSlotObj
	//{
	//	get
	//	{
			
	//		if (string.IsNullOrEmpty(RegionalTimeSlot))
	//			return null;
	//		var times = Regex.Matches(RegionalTimeSlot, @"(.*)\s*-\s*(.*)");
	//		if (times.Count == 0)
	//			return Tuple.Create(P(RegionalTimeSlot), (DateTime?)null);
	//		var match = times[0];
	//		if (!match.Success)
	//			return Tuple.Create(P(RegionalTimeSlot), (DateTime?)null);

	//		return Tuple.Create(P(match.Groups[1].Value), (DateTime?)P(match.Groups[2].Value));
	//		return null;
	//	}
	//}

    private DateTime P(string s)
	{
		var dt = DateTime.Parse(s);
		if (dt.TimeOfDay < TimeSpan.FromHours(7))
			return dt + TimeSpan.FromHours(12);
		return dt;
	}

	public virtual Team CloneWithOmittedStudents(IEnumerable<Student> studentsToOmit)
	{
		var studentsToOmitList = studentsToOmit.ToList();
		var omittedStudents = Students.Where(studentsToOmitList.Contains).ToList();
		if (!omittedStudents.Any())
			return new Team{Captain = Captain, Event = Event, Students = Students.ToList(), TeamId = Name};

		var remainingStudents = Students.Where(s => !studentsToOmitList.Contains(s)).ToList();
		return new PartialTeam { Name = Name, Event = Event, Students = remainingStudents,  OmittedStudents = omittedStudents};
	}

	public Team Clone() => CloneWithOmittedStudents([]);
	
	public static int GetStudentTeamOverlapCount(IList<Team>[] timeSlots)
	{
		return timeSlots.Sum(GetStudentTeamOverlapCount);
	}

	private static int GetStudentTeamOverlapCount(IList<Team> timeSlot)
	{
		return GetStudentTeamOverlaps(timeSlot).Count();
	}

    public static IEnumerable<Tuple<Student, IEnumerable<Team>>> GetStudentTeamOverlaps(IList<Team> timeSlot)
	{
		return
			from s in timeSlot.SelectMany(ts => ts.Students).Distinct()
			group s by timeSlot.Where(t => t.Students.Contains(s))
			into gs
			where gs.Key.Count() > 1
			select Tuple.Create(gs.First(), gs.Key);
	}

	public override string ToString()
	{
		return Name;
	}

	public string ToStringWithIndividualAndRegional()
	{
		var ind = Event.EventFormat is EventFormat.Individual ? " (Ind.)" : string.Empty;
		var regional= Event.RegionalEvent ? " (Reg.)" : string.Empty;
		//var regional= Event.RegionalEvent ? " (Reg.)" : string.Empty;

		var eventAttributes = Event.EventAttributes();
		return string.IsNullOrEmpty(eventAttributes) ? Name : Name + " (" + eventAttributes + ")";
	}
}