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

namespace Tanshu.Accounts.Repository
{
    public class VoucherDirty : EmptyInterceptor
    {
        public override int[] FindDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types)
        {
            var result = new List<int>();

            // we do not care about other entities here
            if (!(entity is Voucher))
            {
                return null;
            }

            var length = propertyNames.Length;

            // iterate all properties
            for (var i = 0; i < length; i++)
            {
                bool areEqual;
                if (currentState[i] == null)
                    areEqual = previousState[i] == null;
                else
                    areEqual = currentState[i].Equals(previousState[i]);
                var isResettingProperty = propertyNames[i] == "LastEditDate";

                if (!areEqual || isResettingProperty)
                {
                    result.Add(i); // the index of "Code" property will be added always
                }
            }

            return result.ToArray();
        }
    }
}