/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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 3 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, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
#ifndef PLSYNCHOBJ_inc
#define PLSYNCHOBJ_inc

#include "HeadSpin.h"
#include "pnKeyedObject/hsKeyedObject.h"
#include "pnKeyedObject/plKey.h"
#include "plNetGroup.h"

/////////////////////////////////////
// plSynchedObject
// one per savable object
/////////////////////////////////////
class hsStream;
class plDirtyNotifier;
class plSynchedObject : public hsKeyedObject
{
public:
    enum LocallyOwnedAnswer
    {
        kNo=false,
        kYes=true
    };

    enum Flags  
    {
        kDontDirty              = 0x1,
        kSendReliably           = 0x2,      // object wants reliable send
        kHasConstantNetGroup    = 0x4,      // has a constant net group.
        kDontSynchGameMessages  = 0x8,      // don't send/recv game actions
        kExcludePersistentState = 0x10,     // don't send SDL state msgs to server, check exclude list
        kExcludeAllPersistentState=0x20,    // don't send ANY type of SDL state
        kLocalOnly              = (kExcludeAllPersistentState | kDontSynchGameMessages),    // localOnly in all respects
        kHasVolatileState       = 0x40,     // server won't save this state on shutdown
        kAllStateIsVolatile      = 0x80
    };

    enum SDLSendFlags   
    {
        kBCastToClients         = 0x1,
        kForceFullSend          = 0x2,
        kSkipLocalOwnershipCheck= 0x4,
        kSendImmediately        = 0x8,
        kDontPersistOnServer    = 0x10,     // for an SDL bcast msg which is used for synching only, not persisting
        kUseRelevanceRegions    = 0x20,
        kNewState               = 0x40,
        kIsAvatarState          = 0x80,
    };

    struct StateDefn
    {
        plKey   fObjKey;
        uint32_t  fSendFlags;
        std::string fSDLName;

        plSynchedObject* GetObject() const { return plSynchedObject::ConvertNoRef(fObjKey->ObjectIsLoaded()); }
        StateDefn() : fObjKey(nil),fSendFlags(0) {}
        StateDefn(plKey k, uint32_t f, const char* sdlName) : fObjKey(k),fSendFlags(f) { fSDLName=sdlName; }
    };

private:
    typedef std::vector<std::string> SDLStateList;
    SDLStateList fSDLExcludeList;
    SDLStateList fSDLVolatileList;
    uint32_t fSynchFlags;

    plNetGroupId fNetGroup;

    static std::vector<bool> fSynchStateStack;
    static plSynchedObject* fStaticSynchedObj;      // static which temporarily holds address of each object's synchMgr
    static std::vector<StateDefn>   fDirtyStates;

    static void IRemoveDirtyState(plKey o, const char* sdlName);
    static void IAddDirtyState(plKey o, const char* sdlName, uint32_t sendFlags);
    bool IOKToDirty(const char* SDLStateName) const;
    SDLStateList::const_iterator IFindInSDLStateList(const SDLStateList& list, const char* sdlName) const;
protected:
    bool IOKToNetwork(const char* sdlName, uint32_t* synchFlags) const;   
public:
    plSynchedObject();
    virtual ~plSynchedObject();

    CLASSNAME_REGISTER( plSynchedObject );
    GETINTERFACE_ANY( plSynchedObject, hsKeyedObject);

    virtual bool MsgReceive(plMessage* msg);
    
    // getters
    int GetSynchFlags() const { return fSynchFlags; }
    plNetGroupId GetNetGroup() const { return fNetGroup; };
    plNetGroupId GetEffectiveNetGroup() const;
    
    // setters
    void SetSynchFlagsBit(uint32_t f) { fSynchFlags |= f; }
    virtual void SetNetGroupConstant(plNetGroupId netGroup);
    virtual void SetNetGroup(plNetGroupId netGroup) { fNetGroup = netGroup; }   
    plNetGroupId SelectNetGroup(plKey groupKey);

    virtual bool DirtySynchState(const char* sdlName, uint32_t sendFlags);      
    void SendSDLStateMsg(const char* SDLStateName, uint32_t synchFlags);  // don't use, only for net code

    void ClearSynchFlagsBit(uint32_t f) { fSynchFlags &= ~f; }

    // static 
    static bool GetSynchDisabled() { return fSynchStateStack.size() ? fSynchStateStack.back() : true; }
    static void PushSynchDisabled(bool b) { fSynchStateStack.push_back(b); }
    static bool PopSynchDisabled();
    static plSynchedObject* GetStaticSynchedObject() { return fStaticSynchedObj; }
    static int32_t GetNumDirtyStates() { return fDirtyStates.size(); }
    static plSynchedObject::StateDefn* GetDirtyState(int32_t i) { return &fDirtyStates[i]; }
    static void ClearDirtyState(std::vector<StateDefn>& carryOver) { fDirtyStates=carryOver; } 

    // IO 
//  void SendCreationMsg(double secs);
//  void SendDestructionMsg(double secs) ;

    virtual void    Read(hsStream* s, hsResMgr* mgr);
    virtual void    Write(hsStream* s, hsResMgr* mgr);

    int IsLocallyOwned() const;     // returns yes/no/maybe
    
    // disable net synching only
    bool IsNetSynched() const { return (fSynchFlags & kDontSynchGameMessages)==0; }
    void SetNetSynched(bool b) { if (!b) fSynchFlags |= kDontSynchGameMessages; else fSynchFlags &= ~kDontSynchGameMessages;    }

    // disable net synching AND persisting
    bool IsLocalOnly() const { return (fSynchFlags & kLocalOnly)==0;    }
    void SetLocalOnly(bool b) { if (b) fSynchFlags |= kLocalOnly; else fSynchFlags &= ~kLocalOnly;  }

    // disable particular types of persistence
    void AddToSDLExcludeList(const char*);
    void RemoveFromSDLExcludeList(const char*);
    bool IsInSDLExcludeList(const char*) const;

    // make volatile particular types of state
    void AddToSDLVolatileList(const char*);
    void RemoveFromSDLVolatileList(const char*);
    bool IsInSDLVolatileList(const char*) const;

    //
    // synched value stuff, currently unused
    // current size is 16 + numValue bytes*2 + numFriends*4 bytes
    //
#ifdef USE_SYNCHED_VALUES
public:
    typedef uint16_t AddrOffsetType;
    typedef uint8_t NumSynchedValuesType;
    typedef uint16_t FlagsType;
    friend class plSynchedValueBase;

private:
    AddrOffsetType* fSynchedValueAddrOffsets;   // represent uint32_ts offsets
    NumSynchedValuesType fNumSynchedValues;

    // array of friends
    plSynchedValueBase** fSynchedValueFriends;  
    NumSynchedValuesType fNumSynchedValueFriends;

    // dirty callback notifiers
    std::vector<plDirtyNotifier*> fDirtyNotifiers;

    void IAppendSynchedValueAddrOffset(AddrOffsetType synchedValueAddrOffset);
    void IAppendSynchedValueFriend(plSynchedValueBase* v);
    plSynchedValueBase* IGetSynchedValue(NumSynchedValuesType i) const
        { return (plSynchedValueBase*)((int32_t)this + (fSynchedValueAddrOffsets[i]<<2)); }
    plSynchedValueBase* IGetSynchedValueFriend(NumSynchedValuesType i) const
        { return fSynchedValueFriends[i]; }

public:
    int32_t GetNumSynchedValues() const { return fNumSynchedValues+fNumSynchedValueFriends; }
    plSynchedValueBase* GetSynchedValue(int i) const;

    uint8_t RegisterSynchedValue(plSynchedValueBase* v); 
    bool RemoveSynchedValue(plSynchedValueBase* v);       // handles SVFriends too
    void RegisterSynchedValueFriend(plSynchedValueBase* v); 
#endif

#ifdef USE_DIRTY_NOTIFIERS
    // dirty CB notifiers
    void AddDirtyNotifier(plDirtyNotifier* dn);
    void RemoveDirtyNotifier(plDirtyNotifier* dn);
#endif
    void CallDirtyNotifiers();
};

//
// helper class to set dirty tracking on/off within scope
//
class plSynchEnabler
{
public:
    plSynchEnabler(bool enable) { plSynchedObject::PushSynchDisabled(!enable); }
    ~plSynchEnabler() { plSynchedObject::PopSynchDisabled(); }
};

#ifdef USE_DIRTY_NOTIFIERS
///////////////////////////////////
// plDirtyNotifier - When a synchedObj 
// gets dirty, this callback will be called.
///////////////////////////////////
class plDirtyNotifier
{
protected:
    plKey fSynchedObjKey;
    void* fUserData;
public: 
    plDirtyNotifier() : fSynchedObjKey(nil),fUserData(nil) {}
    virtual ~plDirtyNotifier()
    {
        if (fSynchedObjKey)
        {
            plSynchedObject* so = plSynchedObject::ConvertNoRef(fSynchedObjKey->ObjectIsLoaded());
            if (so)
                so->RemoveDirtyNotifier(this);
        }
    }
    
    void SetSynchedObjKey(plKey k) { fSynchedObjKey=k; }    // should be set
    void SetUserData(void* v) { fUserData=v;}               // optional 

    plKey   GetSynchedObjKey() { return fSynchedObjKey; }
    void*   GetUserData() { return fUserData;}

    // override
    virtual void Callback() = 0;
};
#endif

//
// MACROS
//

#ifdef USE_SYNCHED_VALUES
#define SYNCHED_VALUE(type)             plSynchedValue<type>    
#define SYNCHED_TARRAY(type)            plSynchedTArray<type>   
#define SYNCHED_VALUE_FRIEND(type)      plSynchedValueFriend<type>  
#define SYNCHED_TARRAY_FRIEND(type)     plSynchedTArrayFriend<type> 
#else
#define SYNCHED_VALUE(type)             type
#define SYNCHED_TARRAY(type)            hsTArray<type>
#define SYNCHED_VALUE_FRIEND(type)      type
#define SYNCHED_TARRAY_FRIEND(type)     hsTArray<type>
#endif

#endif  // PLSYNCHOBJ_inc