using System.Collections.Generic;
using System.Linq;
using Tanshu.Accounts.Entities;

namespace Tanshu.Accounts.Repository
{
    public class ModifierBI : UnitOfWork<Modifier>
    {
        public IList<ProductGroup> ProductGroupList()
        {
            return _session.QueryOver<ProductGroup>()
                   .OrderBy(x => x.SortOrder).Asc
                   .List();
        }
        public void Insert(Modifier modifier, bool showForAll, IEnumerable<ProductGroup> selectedGroups)
        {
            if (showForAll)
                selectedGroups = null;
            SetGroups(modifier, selectedGroups);
            _session.Save(modifier);
        }

        public void Update(Modifier modifier, bool showForAll, IEnumerable<ProductGroup> selectedGroups)
        {
            if (showForAll)
                selectedGroups = null;
            SetGroups(modifier, selectedGroups);
            _session.Update(modifier);
        }
        private void SetGroups(Modifier modifier, IEnumerable<ProductGroup> selectedGroups)
        {
            if (selectedGroups == null)
            {
                var ug = modifier.ProductGroupModifiers.SingleOrDefault(x => x.ProductGroup == null);
                var others = modifier.ProductGroupModifiers.Where(x => x.ProductGroup != null).ToList();
                for (var i = others.Count() -1; i >= 0; i--)
                {
                    var item = others[i];
                    modifier.ProductGroupModifiers.Remove(item);
                    _session.Delete(item);
                }
                if (ug == null)
                {
                    var pgm = new ProductGroupModifier() { Modifier = modifier, ProductGroup = null, ShowAutomatically = false };
                    _session.Save(pgm);
                }
            }
            else
            {
                var groups = new Dictionary<ProductGroup, bool>();
                foreach (var item in ProductGroupList())
                {
                    groups.Add(item, selectedGroups.Any(x => x.ProductGroupID == item.ProductGroupID));
                }
                foreach (var item in groups)
                {
                    var id = item.Key.ProductGroupID;
                    var ug = modifier.ProductGroupModifiers.SingleOrDefault(x =>x.ProductGroup != null && x.ProductGroup.ProductGroupID == id);
                    if (item.Value && ug == null)
                    {
                        var pgm = new ProductGroupModifier() { Modifier = modifier, ProductGroup = item.Key, ShowAutomatically = false };
                        _session.Save(pgm);
                    }
                    else if (!item.Value && ug != null)
                    {
                        modifier.ProductGroupModifiers.Remove(ug);
                        _session.Delete(ug);
                    }
                }
                var blank = modifier.ProductGroupModifiers.SingleOrDefault(x => x.ProductGroup == null);
                if (blank != null)
                {
                    modifier.ProductGroupModifiers.Remove(blank);
                    _session.Delete(blank);
                }

            }
        }
    }
}