BCSH1-TournamentApp/TournamentOrganizer/Models/Tournament.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace TournamentOrganizer.Models;

public class Tournament
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public int GameId { get; set; }
    public int EventId { get; set; }
    [CustomValidation(typeof(Tournament), nameof(ValidateDates))]
    public DateTime Start { get; set; }
    [CustomValidation(typeof(Tournament), nameof(ValidateDates))]
    public DateTime End { get; set; }

    public RuleSet S1RuleSet { get; set; }
    public int? S1Groups { get; set; }
    public int? S1GroupAdvances { get; set; }
    public RuleSet? S2RuleSet { get; set; }

    public required Game Game { get; set; }
    public required Event Event { get; set; }

    public static ValidationResult ValidateDates(DateTime date, ValidationContext context)
    {
        Tournament instance = (Tournament)context.ObjectInstance;
        if (date >= instance.Event.Start && date <= instance.Event.End)
            return ValidationResult.Success;
        return new("Tournament must take place during the event.");
    }

}