using System.Reflection;
using ln.type;

namespace ln.application
{
    public class PropertyArgument : IArgument
    {
        public PropertyInfo PropertyInfo { get; }
        public object Instance { get;}

        public PropertyArgument(PropertyInfo propertyInfo)
            :this(null, propertyInfo, propertyInfo.GetCustomAttribute<StaticArgumentAttribute>())
        {}
        public PropertyArgument(object instance, PropertyInfo propertyInfo)
            :this(instance, propertyInfo, propertyInfo.GetCustomAttribute<StaticArgumentAttribute>())
        {}

        public PropertyArgument(PropertyInfo propertyInfo, StaticArgumentAttribute staticArgumentAttribute)
            :this(null, propertyInfo, staticArgumentAttribute){}
        public PropertyArgument(object instance,PropertyInfo propertyInfo, StaticArgumentAttribute staticArgumentAttribute)
        {
            PropertyInfo = propertyInfo;
            OptionName = staticArgumentAttribute?.Option ?? (char)0;
            LongOptionName = staticArgumentAttribute?.LongOption ?? propertyInfo.Name;
            HelpString = staticArgumentAttribute?.HelpString ?? "";
            HasArgument = propertyInfo.PropertyType != typeof(bool);
            Instance = instance;
        }

        public char OptionName { get; }
        public string LongOptionName { get; }
        public bool HasArgument { get; }
        public string HelpString { get; }
        public string Value
        {
            get => PropertyInfo.GetValue(Instance)?.ToString();
            set
            {
                if (HasArgument)
                {
                    PropertyInfo.SetValue(Instance, Cast.To(value, PropertyInfo.PropertyType));
                }
                else
                {
                    PropertyInfo.SetValue(Instance, true);
                }
            }
        }
    }
}