using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using Tanshu.Accounts.Entities;
using NHibernate;
using NHibernate.Criterion;
using NHibernate.Transform;

namespace Tanshu.Accounts.Repository
{
    public class ProductGroupBI : UnitOfWork<ProductGroup>
    {
        public new IList<ProductGroup> List()
        {
            return _session.QueryOver<ProductGroup>()
                .OrderBy(x => x.SortOrder).Asc
                .ThenBy(x => x.Name).Asc
                .List();
        }
        public new IList<ProductGroup> List(Expression<Func<ProductGroup, bool>> query)
        {
            _session.FlushMode = FlushMode.Never;
            return _session.QueryOver<ProductGroup>()
                .Where(query)
                .OrderBy(x => x.SortOrder).Asc
                .ThenBy(x => x.Name).Asc
                .List();
        }
        public IList<ProductGroup> SaleList()
        {
            ProductGroup pgAlias = null;
            Product pAlias = null;
            ICriterion isActive = Restrictions.Where<Product>(x => x.IsActive);

            return _session.QueryOver<ProductGroup>(() => pgAlias)
                .Left.JoinAlias(x => x.Products, () => pAlias, isActive)
                .Where(x => x.IsActive)
                .OrderBy(x => x.SortOrder).Asc
                .ThenBy(x => x.Name).Asc
                .ThenBy(() => pAlias.SortOrder).Asc
                .ThenBy(() => pAlias.Name).Asc
                .TransformUsing(Transformers.DistinctRootEntity)
                .List();
        }
        public IList<string> GetProductGroupTypes()
        {
            const string query = @"select distinct(pg.GroupType) from ProductGroup pg order by pg.GroupType";
            var hnq = _session.CreateQuery(query);
            return hnq.List<string>();
        }
        public ProductGroup GetProductGroupOfProduct(Guid productID)
        {
            using (var session = SessionManager.Session)
            {
                var item = (from p in session.QueryOver<Product>()
                            where p.ProductID == productID
                            select p.ProductGroup).SingleOrDefault<ProductGroup>();
                NHibernateUtil.Initialize(item);
                return item;
            }
        }
        public void UpdateSortOrder(IList<ProductGroup> list)
        {
            for (int i = 0; i < list.Count; i++)
            {
                var item = list[i];
                var productGroup = _session.Get<ProductGroup>(item.ProductGroupID);
                productGroup.SortOrder = i;
                _session.Update(productGroup);
            }
        }
    }
}