trail-into-darkness/Packages/com.jovian.popup-system/Runtime/PopupCategory.cs

using System;
using UnityEngine;

namespace Jovian.PopupSystem {
    [Serializable]
    public struct PopupCategory : IEquatable<PopupCategory> {
        [SerializeField] string id;

        public string Id => id;

        public PopupCategory(string id) {
            this.id = id;
        }

        public static readonly PopupCategory Character = new("Character");
        public static readonly PopupCategory Item = new("Item");
        public static readonly PopupCategory Skill = new("Skill");
        public static readonly PopupCategory General = new("General");

        public bool Equals(PopupCategory other) {
            return string.Equals(id, other.id, StringComparison.Ordinal);
        }

        public override bool Equals(object obj) {
            return obj is PopupCategory other && Equals(other);
        }

        public override int GetHashCode() {
            return id != null ? id.GetHashCode() : 0;
        }

        public override string ToString() {
            return id ?? string.Empty;
        }

        public static bool operator ==(PopupCategory left, PopupCategory right) {
            return left.Equals(right);
        }

        public static bool operator !=(PopupCategory left, PopupCategory right) {
            return !left.Equals(right);
        }
    }
}