using System.Collections.Generic;
using MfGames.Gallium;
namespace MfGames.Nitride.Entities;
/// <summary>
/// Defines a relationship between a given entity and the others in a sequence.
/// </summary>
public class EntitySequence
{
public EntitySequence(
IReadOnlyList<Entity> sequence,
int index)
this.Sequence = sequence;
this.Index = index;
}
public bool HasNext => this.Sequence.Count > 0 && !this.IsLast;
public bool HasPrevious => this.Sequence.Count > 0 && !this.IsFirst;
public int Index { get; }
public bool IsFirst => this.Sequence.Count > 0 && this.Index == 0;
public bool IsLast => this.Sequence.Count > 0 && this.Index == this.Sequence.Count - 1;
public Entity? Next => this.HasNext ? this.Sequence[this.Index + 1] : null;
public Entity? Previous => this.HasPrevious ? this.Sequence[this.Index - 1] : null;
public IReadOnlyList<Entity> Sequence { get; }