using System.Reflection;

namespace YLErp.Web.Areas.Admin.Models
{
    /// <summary>
    /// 
    /// </summary>
    public class OtcFormatViewModel
    {
        public IEnumerable<SelectItemNest> SelectItems { get; set; }

        public static OtcFormatViewModel CreateViewModel(OtcFormatModel otcFormat)
        {
            if (otcFormat is null)
            {
                throw new System.ArgumentNullException(nameof(otcFormat));
            }

            var selectItems = GetSelectItems(otcFormat);

            return new OtcFormatViewModel { SelectItems = selectItems };
        }

        private static IEnumerable<SelectItemNest> GetSelectItems(object obj, int depth = 0)
        {
            var flags = BindingFlags.Instance | BindingFlags.Public;
            var properties = obj.GetType().GetProperties(flags);
            var resultList = new List<SelectItemNest>(properties.Length);

            foreach (var p in properties)
            {
                if (p.CanRead && p.CanWrite)
                {
                    var attr = p.GetCustomAttribute(typeof(OtcFormatConfigAttribute)) as OtcFormatConfigAttribute;

                    if (attr == null)
                    {
                        continue;
                    }

                    var item = new SelectItemNest
                    {
                        Value = p.Name,
                        Text = attr.Label,
                        Tag = p.GetValue(obj)
                    };

                    if (depth == 0)
                    {
                        item.SelectItems = GetSelectItems(item.Tag, depth + 1);
                    }

                    resultList.Add(item);
                }
            }

            return resultList;
        }
    }
}