namespace Mr.BrickAdventures.Progression;

/// <summary>
/// Stable identity of a Skill, matching the authored <c>SkillData</c> name that saves already
/// reference. Identity only — the upgrade table and presentation stay in the authored asset.
/// </summary>
public readonly struct SkillId : IEquatable<SkillId>
{
    public string Value { get; }

    private SkillId(string value) => Value = value;

    public static SkillId Of(string value) => string.IsNullOrWhiteSpace(value)
        ? throw new ArgumentException("A skill id cannot be blank.", nameof(value))
        : new SkillId(value);

    public bool Equals(SkillId other) => string.Equals(Value, other.Value, StringComparison.Ordinal);
    public override bool Equals(object? obj) => obj is SkillId other && Equals(other);
    public override int GetHashCode() => StringComparer.Ordinal.GetHashCode(Value ?? string.Empty);
    public override string ToString() => Value;
}