using System.Diagnostics.CodeAnalysis;
using SQLite;

namespace Backend.Model.Relations;

public abstract class Relation<L,R>
{
    [PrimaryKey, AutoIncrement]
    [Obsolete("Do not use for any business logic")]
    public Int64 Id { get; set; }

    [Ignore] protected L Left  { get; set; } = default!;
    [Ignore] protected R Right { get; set; } = default!;

    protected Boolean Equals(Relation<L, R> other)
    {
        return EqualityComparer<L>.Default.Equals(Left, other.Left) 
            && EqualityComparer<R>.Default.Equals(Right, other.Right);
    }

    public override Boolean Equals(Object? obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (ReferenceEquals(this, obj)) return true;
        
        return obj.GetType() == GetType() && Equals((Relation<L, R>)obj);
    }

    [SuppressMessage("ReSharper", "NonReadonlyMemberInGetHashCode")]
    public override Int32 GetHashCode() => HashCode.Combine(Left, Right);

    public static Boolean operator ==(Relation<L, R>? left, Relation<L, R>? right) => Equals(left, right);
    public static Boolean operator !=(Relation<L, R>? left, Relation<L, R>? right) => !Equals(left, right);
}