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

namespace Tanshu.Accounts.Repository
{
    public class ProductBI : UnitOfWork<Product>
    {
        public Product Get(string nameAndUnits)
        {
            return Get(x => x.Name + " (" + x.Units + ")" == nameAndUnits);
        }
        public new IList<Product> List(Expression<Func<Product, bool>> query)
        {
            var list = _session.QueryOver<Product>()
                .Where(query)
                .OrderBy(x => x.SortOrder).Asc
                .ThenBy(x => x.Name).Asc
                .List();
            foreach (var item in list)
            {
                NHibernateUtil.Initialize(item.ProductGroup);
                NHibernateUtil.Initialize(item.ServiceTax);
                NHibernateUtil.Initialize(item.Vat);
            }
            return list;
        }

        public new IList<Product> List()
        {
            var list = _session.QueryOver<Product>()
                .OrderBy(x => x.ProductGroup).Asc
                .ThenBy(x => x.SortOrder).Asc
                .ThenBy(x => x.Name).Asc
                .List();
            foreach (var item in list)
            {
                NHibernateUtil.Initialize(item.ProductGroup);
                NHibernateUtil.Initialize(item.ServiceTax);
                NHibernateUtil.Initialize(item.Vat);
            }
            return list;
        }

        public static IList<Product> List(Guid productGroupID)
        {
            using (var session = SessionManager.Session)
            {
                return (from product in session.QueryOver<Product>()
                        where product.ProductGroup.ProductGroupID == productGroupID
                        select product).List();
            }
        }

        public void UpdateSortOrder(IList<Product> list)
        {
            int order = 0;
            Guid lastGroup = Guid.Empty;
            for (int i = 0; i < list.Count; i++)
            {
                var item = list[i];
                if (lastGroup != item.ProductGroup.ProductGroupID)
                {
                    order = 0;
                    lastGroup = item.ProductGroup.ProductGroupID;
                }
                else
                {
                    order += 5;
                }
                var product = _session.Get<Product>(item.ProductID);
                product.SortOrder = order;
                _session.Update(product);
            }
        }
    }
}