/*
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * Copyright (C) 2008-2009 Trinity <http://www.trinitycore.org/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "Creature.h"
#include "CreatureAISelector.h"
#include "PassiveAI.h"
#include "Policies/SingletonImp.h"
#include "MovementGenerator.h"
#include "ScriptCalls.h"
#include "Pet.h"
#include "TemporarySummon.h"
#include "CreatureAIFactory.h"

INSTANTIATE_SINGLETON_1(CreatureAIRegistry);
INSTANTIATE_SINGLETON_1(MovementGeneratorRegistry);

namespace FactorySelector
{
    CreatureAI* selectAI(Creature *creature)
    {
        const CreatureAICreator *ai_factory = NULL;
        CreatureAIRegistry &ai_registry(CreatureAIRepository::Instance());

        if(creature->isPet())
            ai_factory = ai_registry.GetRegistryItem("PetAI");

        //scriptname in db
        if(!ai_factory)
            if(CreatureAI* scriptedAI = Script->GetAI(creature))
                return scriptedAI;

        // AIname in db
        std::string ainame=creature->GetAIName();
        if(!ai_factory && !ainame.empty())
            ai_factory = ai_registry.GetRegistryItem( ainame.c_str() );

        // select by NPC flags
        if(!ai_factory)
        {
            if(creature->HasUnitTypeMask(UNIT_MASK_CONTROLABLE_GUARDIAN) && ((Guardian*)creature)->GetOwner()->GetTypeId() == TYPEID_PLAYER)
                ai_factory = ai_registry.GetRegistryItem("PetAI");
            else if(creature->IsVehicle() || creature->HasFlag(UNIT_NPC_FLAGS, UNIT_NPC_FLAG_SPELLCLICK))
                ai_factory = ai_registry.GetRegistryItem("NullCreatureAI");
            else if(creature->isGuard())
                ai_factory = ai_registry.GetRegistryItem("GuardAI");
            else if(creature->HasUnitTypeMask(UNIT_MASK_CONTROLABLE_GUARDIAN))
                ai_factory = ai_registry.GetRegistryItem("PetAI");
            else if(creature->isTotem())
                ai_factory = ai_registry.GetRegistryItem("TotemAI");
            else if(creature->isTrigger())
            {
                if(creature->m_spells[0])
                    ai_factory = ai_registry.GetRegistryItem("TriggerAI");
                else
                    ai_factory = ai_registry.GetRegistryItem("NullCreatureAI");
            }
            else if(creature->GetCreatureType() == CREATURE_TYPE_CRITTER && !creature->HasUnitTypeMask(UNIT_MASK_GUARDIAN))
                ai_factory = ai_registry.GetRegistryItem("CritterAI");
        }

        if(!ai_factory)
        {
            for (uint32 i = 0; i < CREATURE_MAX_SPELLS; ++i)
            {
                if(creature->m_spells[i])
                {
                    ai_factory = ai_registry.GetRegistryItem("CombatAI");
                    break;
                }
            }
        }

        // select by permit check
        if(!ai_factory)
        {
            int best_val = -1;
            typedef CreatureAIRegistry::RegistryMapType RMT;
            RMT const &l = ai_registry.GetRegisteredItems();
            for (RMT::const_iterator iter = l.begin(); iter != l.end(); ++iter)
            {
                const CreatureAICreator *factory = iter->second;
                const SelectableAI *p = dynamic_cast<const SelectableAI *>(factory);
                assert( p != NULL );
                int val = p->Permit(creature);
                if( val > best_val )
                {
                    best_val = val;
                    ai_factory = p;
                }
            }
        }

        // select NullCreatureAI if not another cases
        ainame = (ai_factory == NULL) ? "NullCreatureAI" : ai_factory->key();

        DEBUG_LOG("Creature %u used AI is %s.", creature->GetGUIDLow(), ainame.c_str() );
        return ( ai_factory == NULL ? new NullCreatureAI(creature) : ai_factory->Create(creature) );
    }

    MovementGenerator* selectMovementGenerator(Creature *creature)
    {
        MovementGeneratorRegistry &mv_registry(MovementGeneratorRepository::Instance());
        assert( creature->GetCreatureInfo() != NULL );
        const MovementGeneratorCreator *mv_factory = mv_registry.GetRegistryItem( creature->GetDefaultMovementType());

        /* if( mv_factory == NULL  )
        {
            int best_val = -1;
            std::vector<std::string> l;
            mv_registry.GetRegisteredItems(l);
            for (std::vector<std::string>::iterator iter = l.begin(); iter != l.end(); ++iter)
            {
            const MovementGeneratorCreator *factory = mv_registry.GetRegistryItem((*iter).c_str());
            const SelectableMovement *p = dynamic_cast<const SelectableMovement *>(factory);
            assert( p != NULL );
            int val = p->Permit(creature);
            if( val > best_val )
            {
                best_val = val;
                mv_factory = p;
            }
            }
        }*/

        return ( mv_factory == NULL ? NULL : mv_factory->Create(creature) );

    }
}