/*
 * Copyright (C) 2005-2010 MaNGOS <http://getmangos.com/>
 *
 * 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 "Common.h"
#include "UpdateMask.h"
#include "Opcodes.h"
#include "World.h"
#include "ObjectAccessor.h"
#include "Database/DatabaseEnv.h"
#include "GridNotifiers.h"
#include "CellImpl.h"
#include "GridNotifiersImpl.h"
#include "SpellMgr.h"

DynamicObject::DynamicObject() : WorldObject(), m_isActiveObject(false)
{
    m_objectType |= TYPEMASK_DYNAMICOBJECT;
    m_objectTypeId = TYPEID_DYNAMICOBJECT;

    m_updateFlag = (UPDATEFLAG_HIGHGUID | UPDATEFLAG_HAS_POSITION | UPDATEFLAG_POSITION);

    m_valuesCount = DYNAMICOBJECT_END;
}

void DynamicObject::AddToWorld()
{
    ///- Register the dynamicObject for guid lookup
    if(!IsInWorld())
        GetMap()->GetObjectsStore().insert<DynamicObject>(GetGUID(), (DynamicObject*)this);

    Object::AddToWorld();
}

void DynamicObject::RemoveFromWorld()
{
    ///- Remove the dynamicObject from the accessor
    if(IsInWorld())
        GetMap()->GetObjectsStore().erase<DynamicObject>(GetGUID(), (DynamicObject*)NULL);

    Object::RemoveFromWorld();
}

bool DynamicObject::Create( uint32 guidlow, Unit *caster, uint32 spellId, SpellEffectIndex effIndex, float x, float y, float z, int32 duration, float radius )
{
    WorldObject::_Create(guidlow, HIGHGUID_DYNAMICOBJECT, caster->GetPhaseMask());
    SetMap(caster->GetMap());
    Relocate(x, y, z, 0);

    if(!IsPositionValid())
    {
        sLog.outError("DynamicObject (spell %u eff %u) not created. Suggested coordinates isn't valid (X: %f Y: %f)",spellId,effIndex,GetPositionX(),GetPositionY());
        return false;
    }

    SetEntry(spellId);
    SetFloatValue( OBJECT_FIELD_SCALE_X, 1 );
    SetUInt64Value( DYNAMICOBJECT_CASTER, caster->GetGUID() );
    SetUInt32Value( DYNAMICOBJECT_BYTES, 0x00000001 );
    SetUInt32Value( DYNAMICOBJECT_SPELLID, spellId );
    SetFloatValue( DYNAMICOBJECT_RADIUS, radius);
    SetUInt32Value( DYNAMICOBJECT_CASTTIME, getMSTime() );  // new 2.4.0

    m_aliveDuration = duration;
    m_radius = radius;
    m_effIndex = effIndex;
    m_spellId = spellId;

    // set to active for far sight case
    if(SpellEntry const* spellEntry = sSpellStore.LookupEntry(spellId))
        m_isActiveObject = IsSpellHaveEffect(spellEntry,SPELL_EFFECT_ADD_FARSIGHT);

    return true;
}

Unit* DynamicObject::GetCaster() const
{
    // can be not found in some cases
    return ObjectAccessor::GetUnit(*this, GetCasterGUID());
}

void DynamicObject::Update(uint32 p_time)
{
    // caster can be not in world at time dynamic object update, but dynamic object not yet deleted in Unit destructor
    Unit* caster = GetCaster();
    if(!caster)
    {
        Delete();
        return;
    }

    bool deleteThis = false;

    if(m_aliveDuration > int32(p_time))
        m_aliveDuration -= p_time;
    else
        deleteThis = true;

    // have radius and work as persistent effect
    if(m_radius)
    {
        // TODO: make a timer and update this in larger intervals
        CellPair p(MaNGOS::ComputeCellPair(GetPositionX(), GetPositionY()));
        Cell cell(p);
        cell.data.Part.reserved = ALL_DISTRICT;
        cell.SetNoCreate();

        MaNGOS::DynamicObjectUpdater notifier(*this, caster);

        TypeContainerVisitor<MaNGOS::DynamicObjectUpdater, WorldTypeMapContainer > world_object_notifier(notifier);
        TypeContainerVisitor<MaNGOS::DynamicObjectUpdater, GridTypeMapContainer > grid_object_notifier(notifier);

        cell.Visit(p, world_object_notifier, *GetMap(), *this, m_radius);
        cell.Visit(p, grid_object_notifier,  *GetMap(), *this, m_radius);
    }

    if(deleteThis)
    {
        caster->RemoveDynObjectWithGUID(GetGUID());
        Delete();
    }
}

void DynamicObject::Delete()
{
    SendObjectDeSpawnAnim(GetGUID());
    AddObjectToRemoveList();
}

void DynamicObject::Delay(int32 delaytime)
{
    m_aliveDuration -= delaytime;
    for(AffectedSet::iterator iunit= m_affected.begin(); iunit != m_affected.end(); ++iunit)
        if (*iunit)
            (*iunit)->DelayAura(m_spellId, m_effIndex, delaytime);
}

bool DynamicObject::isVisibleForInState(Player const* u, WorldObject const* viewPoint, bool inVisibleList) const
{
    if(!IsInWorld() || !u->IsInWorld())
        return false;

    // always seen by owner
    if(GetCasterGUID()==u->GetGUID())
        return true;

    // normal case
    return IsWithinDistInMap(viewPoint, World::GetMaxVisibleDistanceForObject() + (inVisibleList ? World::GetVisibleObjectGreyDistance() : 0.0f), false);
}

bool DynamicObject::IsHostileTo( Unit const* unit ) const
{
    if (Unit* owner = GetCaster())
        return owner->IsHostileTo(unit);
    else
        return false;
}

bool DynamicObject::IsFriendlyTo( Unit const* unit ) const
{
    if (Unit* owner = GetCaster())
        return owner->IsFriendlyTo(unit);
    else
        return true;
}