#if !DEBUG || PROFILE_SVELTO
#define DONT_USE
using System.Diagnostics;
#endif
using System;
using System.Collections.Generic;

namespace Svelto.ECS
{
    /// <summary>
    ///     Note: this check doesn't catch the case when an add and remove is done on the same entity before the nextI am
    ///     submission. Two operations on the same entity are not allowed between submissions.
    /// </summary>
    public partial class EnginesRoot
    {
#if DONT_USE        
        [Conditional("MEANINGLESS")]
#endif
        void CheckRemoveEntityID(EGID egid, Type entityDescriptorType, string caller)
        {
            if (_multipleOperationOnSameEGIDChecker.ContainsKey(egid) == true)
                throw new ECSException(
                    "Executing multiple structural changes (remove) in one submission on the same entity is not supported "
                       .FastConcat(" caller: ", caller, " ").FastConcat(egid.entityID).FastConcat(" groupid: ")
                       .FastConcat(egid.groupID.ToName()).FastConcat(" type: ")
                       .FastConcat(entityDescriptorType != null ? entityDescriptorType.Name : "not available")
                       .FastConcat(" previous operation was: ")
                       .FastConcat(_multipleOperationOnSameEGIDChecker[egid] == 1 ? "add" : "remove"));

            if (_idChecker.TryGetValue(egid.groupID, out var hash))
            {
                if (hash.Contains(egid.entityID) == false)
                    throw new ECSException("Trying to remove an Entity not present in the database "
                       .FastConcat(" caller: ", caller, " entityID ").FastConcat(egid.entityID).FastConcat(" groupid: ")
                       .FastConcat(egid.groupID.ToName()).FastConcat(" type: ")
                       .FastConcat(entityDescriptorType != null ? entityDescriptorType.Name : "not available"));
            }
            else
            {
                throw new ECSException("Trying to remove an Entity with a group never used so far "
                   .FastConcat(" caller: ", caller, " entityID ").FastConcat(egid.entityID).FastConcat(" groupid: ")
                   .FastConcat(egid.groupID.ToName()).FastConcat(" type: ")
                   .FastConcat(entityDescriptorType != null ? entityDescriptorType.Name : "not available"));
            }

            hash.Remove(egid.entityID);

            _multipleOperationOnSameEGIDChecker.Add(egid, 0);
        }
#if DONT_USE
        [Conditional("MEANINGLESS")]
#endif
        void CheckAddEntityID(EGID egid, Type entityDescriptorType, string caller)
        {
            if (_multipleOperationOnSameEGIDChecker.ContainsKey(egid) == true)
                throw new ECSException(
                    "Executing multiple structural changes (build) on the same entity is not supported "
                       .FastConcat(" caller: ", caller, " ").FastConcat(egid.entityID).FastConcat(" groupid: ")
                       .FastConcat(egid.groupID.ToName()).FastConcat(" type: ")
                       .FastConcat(entityDescriptorType != null ? entityDescriptorType.Name : "not available")
                       .FastConcat(" previous operation was: ")
                       .FastConcat(_multipleOperationOnSameEGIDChecker[egid] == 1 ? "add" : "remove"));

            var hash = _idChecker.GetOrAdd(egid.groupID, () => new HashSet<uint>());
            if (hash.Contains(egid.entityID) == true)
                throw new ECSException("Trying to add an Entity already present in the database "
                                      .FastConcat(" caller: ", caller, " entityID ").FastConcat(egid.entityID)
                                      .FastConcat(" groupid: ").FastConcat(egid.groupID.ToName()).FastConcat(" type: ")
                                      .FastConcat(entityDescriptorType != null
                                                      ? entityDescriptorType.Name
                                                      : "not available"));
            hash.Add(egid.entityID);
            
            _multipleOperationOnSameEGIDChecker.Add(egid, 1);
        }

#if DONT_USE
        [Conditional("MEANINGLESS")]
#endif
        void RemoveGroupID(ExclusiveBuildGroup groupID)
        {
            _idChecker.Remove(groupID);
        }

#if DONT_USE
        [Conditional("MEANINGLESS")]
#endif
        void ClearChecksForMultipleOperationsOnTheSameEgid() { _multipleOperationOnSameEGIDChecker.Clear(); }

        readonly DataStructures.FasterDictionary<EGID, uint>                          _multipleOperationOnSameEGIDChecker;
        readonly DataStructures.FasterDictionary<ExclusiveGroupStruct, HashSet<uint>> _idChecker;
    }
}