using System;
using System.Reflection;

namespace Game
{
    [Flags]
    public enum ConsoleFlags
    {
        NoSerialize = 1, // Value does not persist

        Alias = NoSerialize
    }

    internal struct ConsoleVariable
    {
        public string name { get; }
        public ConsoleFlags flags { get; }

        private readonly FieldInfo field;
        private readonly MethodInfo getter;
        private readonly MethodInfo setter;

        public ConsoleVariable(string name, ConsoleFlags flags, FieldInfo field)
        {
            this.name = name;
            this.flags = flags;
            this.field = field;
            getter = null;
            setter = null;
        }

        public ConsoleVariable(string name, ConsoleFlags flags, MethodInfo getter, MethodInfo setter)
        {
            this.name = name;
            this.flags = flags;
            field = null;
            this.getter = getter;
            this.setter = setter;
        }

        public string GetValueString()
        {
            Type type = field != null ? field.FieldType : getter.ReturnType;
            if (type == typeof(string))
            {
                if (field != null)
                    return (string)field.GetValue(null);
                if (setter != null)
                    return (string)getter.Invoke(null, null);
            }
            else
            {
                throw new Exception("cvar is not type of string");
            }

            throw new Exception("GetValueString no field or getter specified");
        }

        public void SetValue(string value)
        {
            Type type = field != null ? field.FieldType : getter.ReturnType;
            if (type == typeof(string))
            {
                if (field != null)
                    field.SetValue(null, value);
                else if (setter != null)
                    setter.Invoke(null, new object[] { value });
            }
            else
            {
                throw new Exception("Unsupported type for SetValue: " + type.Name);
            }
        }
    }
}