using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Com.Piwigo.Lib.DTO;

namespace Com.Piwigo.Wpf.DTO.Helper
{
    public static class PwgCategoryListWPFHelper
    {
        public static void AddPwgCategoryToList(    PwgCategory aPwgCategory,
                                                ref PwgCategoryListWPF aPwgCategoryListWPF)
        {
            if (aPwgCategory != null)
            {
                if (aPwgCategoryListWPF == null)
                {
                    aPwgCategoryListWPF = new PwgCategoryListWPF();
                }

                PwgCategoryWPF pwgCat = new PwgCategoryWPF();
                PwgCategoryWPFHelper.ConvertPwgCategoryToPwgCategoryWPF(aPwgCategory, ref pwgCat);

                aPwgCategoryListWPF.Add(pwgCat);
            }
        }

        public static void ConvertPwgCategoryListToPwgCategoryListWPF(List<PwgCategory> aPwgCategoryList, ref PwgCategoryListWPF aPwgCategoryListWPF)
        {
            if (aPwgCategoryList != null)
            {
                if (aPwgCategoryListWPF == null)
                {
                    aPwgCategoryListWPF = new PwgCategoryListWPF();
                }

                foreach (PwgCategory pwgCat in aPwgCategoryList)
                {
                    AddPwgCategoryToList(pwgCat, ref aPwgCategoryListWPF);
                }
            }
        }

        public static void ConvertPwgCategoryListToPwgRootCategoryWPF(List<PwgCategory> aPwgCategoryList, ref PwgRootCategoryWPF aPwgRootCategory)
        {
            if (aPwgCategoryList != null)
            {
                if ((aPwgRootCategory == null)
                    || (aPwgRootCategory.Childrens == null))
                {
                    throw new SystemException("The PwgCategoryListWPFHelper.InitRootCategory must be called before calling this.");
                }

                if (aPwgRootCategory.Childrens == null)
                {
                    aPwgRootCategory.Childrens = new PwgCategoryListWPF();
                }

                PwgCategoryListWPF aPwgCategoryListWPF = aPwgRootCategory.Childrens;
                foreach (PwgCategory pwgCat in aPwgCategoryList)
                {
                    AddPwgCategoryToList(pwgCat, ref aPwgCategoryListWPF);
                }
            }
        }

        public static void InitRootCategory ()
          {
            if (PwgModelManager.Instance.CategoryList == null)
            {
                throw new SystemException("The PwgModelManager.Instance.CategoryList must be initialized from presentation tread before calling this.");
            }
            if (PwgModelManager.Instance.CategoryList.Count != 1)
            {
                PwgModelManager.Instance.CategoryList.Clear();
                PwgRootCategoryWPF aRootCategory = new PwgRootCategoryWPF();
                aRootCategory.Name = "Categories";
                aRootCategory.Childrens = new PwgCategoryListWPF();
                PwgModelManager.Instance.CategoryList.Add(aRootCategory);
                PwgModelManager.Instance.RootCategoryList = aRootCategory;
            }

            if (PwgModelManager.Instance.RootCategoryList == null)
            {
                PwgModelManager.Instance.RootCategoryList = PwgModelManager.Instance.CategoryList.ElementAtOrDefault(0);
            }

          }
    }
}