RebootKit/Runtime/Engine/Code/Services/Console/CVarFieldInjector.cs

using System;
using System.Reflection;
using RebootKit.Engine.Foundation;

namespace RebootKit.Engine.Services.Console {
    [AttributeUsage(AttributeTargets.Field)]
    public class CVarAttribute : Attribute {
        public CVarAttribute(string name, float defaultValue) {
            Name = name;
            Value = new CVarValue(defaultValue);
        }

        public CVarAttribute(string name, double defaultValue) {
            Name = name;
            Value = new CVarValue(defaultValue);
        }

        public CVarAttribute(string name, string defaultValue) {
            Name = name;
            Value = new CVarValue(defaultValue);
        }

        public CVarAttribute(string name, int defaultValue) {
            Name = name;
            Value = new CVarValue(defaultValue);
        }

        public string Name { get; }
        public CVarValue Value { get; }
    }

    public class CVarFieldInjector : DIContext.IFieldInjector {
        static readonly Logger s_logger = new(nameof(CVarFieldInjector));

        public bool Inject(FieldInfo field, object target, DIContext context) {
            if (!Attribute.IsDefined(field, typeof(CVarAttribute))) return false;

            ConsoleService console = context.Resolve<ConsoleService>();
            if (console == null) {
                s_logger.Error($"Cannot inject field because cannot resolve `{nameof(ConsoleService)}`");
                return false;
            }

            CVarAttribute cvarAttribute = field.GetCustomAttribute<CVarAttribute>();
            CVar cvar = console.GetCVar(cvarAttribute.Name);

            if (cvar == null) {
                cvar = new CVar(cvarAttribute.Name, cvarAttribute.Value);
                console.Replace(cvar);
            }

            field.SetValue(target, cvar);

            return true;
        }
    }
}