using System.Collections.Generic;
using System.Linq;

using BeWo.Data.Access;
using BeWo.Data.Entities;

using BS.Shared;
using BS.Shared.Extensions;

using NHibernate;

namespace BeWo.Service.Core
{
	/// <summary>
	///     Used by more than one Service... ? Businesslogic schicht?
	/// </summary>
	public static class ServiceLogic
	{
		public static bool ConcurrencyCheck(long? pDataContractVersion, BeWoEntityBase pEntity)
		{
			if (pDataContractVersion != null && pDataContractVersion != pEntity.Version)
			{
				throw new StaleObjectStateException(pEntity.GetType().ToString(), pEntity.Oid);
			}

			return true;
		}

		
		public static void SetActivationType<T>(Dictionary<long, long> pOid2Version, ActivationTypeId activationType)
			where T : BeWoEntityBase, new()
		{
			var lOriginals = DAOFactory.GenericDAO.LoadByIDs<T>(pOid2Version.Select(e => e.Key)).Where(e => e.SystemEntryID == null).ToList();

			pOid2Version.Keys.DoForEach(SettingsLogic.RemoveFromAllHistories<T>);

			lOriginals.DoForEach(or => ConcurrencyCheck(pOid2Version[or.Oid.Value], or));
			lOriginals.DoForEach(or => or.IsActive = activationType);

			DAOFactory.GenericDAO.Update(lOriginals);
		}

		public static void SetActivationType<T>(long pOid, long pVersion, ActivationTypeId activationType)
			where T : BeWoEntityBase, new()
		{
			SetActivationType<T>(
				new Dictionary<long, long>
				{
					{
						pOid, pVersion
					}
				},
				activationType);
		}
	}
}