using Signum.Engine.Maps;

using Signum.Entities;

using Signum.Utilities;

using Signum.Utilities.DataStructures;

using Signum.Utilities.ExpressionTrees;

using Signum.Utilities.Reflection;

using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Linq;

using System.Text;

using System.Threading;

using Signum.Engine;

using Signum.Entities.Reflection;



namespace Signum.Engine

{

    public struct InvalidateWith

    {

        static readonly Type[] Empty = new Type[0];



        readonly Type[] types;

        public Type[] Types 

        {

            get { return types ?? Empty; } 

        }



        public InvalidateWith(params Type[] types)

        {

            if(types != null)

                foreach (var type in types)

                {

                    if (type.IsAbstract)

                        throw new InvalidOperationException("Impossible to invalidate using {0} because is abstract".Formato(type));



                    if (!Reflector.IsIdentifiableEntity(type))

                        throw new InvalidOperationException("Impossible to invalidate using {0} because is not and IdentifiableEntity".Formato(type));

                }





            this.types = types;

        }

    }



    public static class GlobalLazy

    {

        static HashSet<IResetLazy> registeredLazyList = new HashSet<IResetLazy>();

        public static ResetLazy<T> WithoutInvalidations<T>(Func<T> func) where T : class

        {

            ResetLazy<T> result = new ResetLazy<T>(() =>

            {

                using (ExecutionMode.Global())

                using (HeavyProfiler.Log("ResetLazy", () => typeof(T).TypeName()))

                using (Transaction tr = Transaction.InTestTransaction ? null : Transaction.ForceNew())

                using (new EntityCache(EntityCacheType.ForceNewSealed))

                {

                    var value = func();



                    if (tr != null)

                        tr.Commit();



                    return value;

                }

            }, mode: LazyThreadSafetyMode.ExecutionAndPublication, 

            declaringType: func.Method.DeclaringType);



            registeredLazyList.Add(result);



            return result;

        }



        public static void ResetAll()

        {

            foreach (var lp in registeredLazyList)

                lp.Reset();

        }



        public static void LoadAll()

        {

            foreach (var lp in registeredLazyList)

                lp.Load();

        }

    }



  

}