using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;

namespace ln.http.rest
{
    public class FieldDescriptor
    {
        Action<object, object> setter;
        Func<object, object> getter;

        public Type OwningType { get; }

        public string FieldName { get; }
        public Type FieldType { get; }

        public bool CanWrite { get; }

        public FieldDescriptor(FieldInfo fieldInfo)
        {
            OwningType = fieldInfo.DeclaringType;
            FieldName = fieldInfo.Name;
            FieldType = fieldInfo.FieldType;

            CanWrite = !fieldInfo.IsInitOnly;

            getter = fieldInfo.GetValue;
            setter = fieldInfo.SetValue;
        }

        public FieldDescriptor(PropertyInfo propertyInfo)
        {
            OwningType = propertyInfo.DeclaringType;
            FieldName = propertyInfo.Name;
            FieldType = propertyInfo.PropertyType;

            CanWrite = propertyInfo.CanWrite;

            getter = propertyInfo.GetValue;
            setter = propertyInfo.SetValue;
        }

        public void SetFieldValue(object objectInstance, object fieldValue) => setter(objectInstance, fieldValue);
        public object GetFieldValue(object objectInstance) => getter(objectInstance);
    }
}