/*==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 hsMemoryDefined
#define hsMemoryDefined

#include "HeadSpin.h"
//#include "hsTemplates.h"

class HSMemory {
public:
    static void BlockMove(const void* src, void* dst, uint32_t length);
    static void Clear(void *m, uint32_t byteLen);
    static void ClearMemory(void *m, uint32_t byteLen) { HSMemory::Clear(m, byteLen); }

    static bool EqualBlocks(const void* block1, const void* block2, uint32_t length);

    static void* New(uint32_t size);
    static void  Delete(void* block);
    static void* Copy(uint32_t length, const void* source);
};

///////////////////////////////////////////////////////////////////////////////////////////

class hsAllocator {
public:
    virtual void*   Alloc(uint32_t size) = 0;
    virtual void    Free(void* addr) = 0;
};

class hsScratchMem {
    enum {
        kBufferSize = 32
    };
    uint8_t*  fMem;
    uint8_t   fMemBuffer[kBufferSize];
    uint32_t  fLength;
public:
    hsScratchMem() : fLength(kBufferSize)
    {
        fMem = fMemBuffer;
    }
    ~hsScratchMem()
    {
        if (fMem != fMemBuffer)
            delete[] fMem;
    }
    uint8_t* GetMem(uint32_t length)
    {
        if (length > fLength)
        {   if (fMem != fMemBuffer)
                delete[] fMem;
            fMem = new uint8_t[length];
            fLength = length;
        }
        return fMem;
    }
};

class hsChunkAllocator {
    enum {
        kDefaultChunkSize = 4096
    };
    uint32_t              fChunkSize;
    struct hsPrivateChunk*  fChunk;
    hsDebugCode(uint32_t  fChunkCount;)
public:
            hsChunkAllocator(uint32_t chunkSize = kDefaultChunkSize);
            ~hsChunkAllocator();

    void        Reset();
    void        SetChunkSize(uint32_t size);
    void*   Allocate(uint32_t size, const void* data = nil);
};

///////////////////////////////////////////////////////////////////////////////////////////

class hsAppender {
    struct hsAppenderHead*  fFirstBlock, *fLastBlock;
    uint32_t              fElemSize, fElemCount, fCount;
    
    friend class hsAppenderIterator;
public:
            hsAppender(uint32_t elemSize, uint32_t minCount = 16);
            ~hsAppender();

    uint32_t  ElemSize() const { return fElemSize; }
    uint32_t  Count() const { return fCount; }
    bool      IsEmpty() const { return fCount == 0; }
    void      Reset();

    uint32_t  CopyInto(void* data = nil) const;   // return size of data array in bytes

    void*     PushHead();
    void      PushHead(const void* data);
    void*     PushTail();
    void      PushTail(const void* data);
    void      PushTail(int count, const void* data);  // data[] = count * fElemSize
    void*     PeekHead() const;
    void*     PeekTail() const;
    bool      PopHead(void* data = nil);
    int       PopHead(int count, void* data = nil);       // data[] = count * fElemSize
    bool      PopTail(void* data = nil);

    //  Alternate interfaces

    void*   Prepend() { return this->PushHead(); }
    void*   Append() { return this->PushTail(); }

    void*   Push() { return this->PushHead(); }
    void    Push(const void* data) { this->PushHead(data); }
    bool    Pop(void* data = nil) { return this->PopHead(data); }

    void*   Enqueue() { return this->PushTail(); };
    void    Enqueue(const void* data) { this->PushTail(data); }
    void    Enqueue(int count, const void* data) { this->PushTail(count, data); }
    bool    Dequeue(void* data = nil) { return this->PopHead(data); }
    int     Dequeue(int count, void* data = nil) { return this->PopHead(count, data); }
};

class hsAppenderIterator {
    const hsAppender*           fAppender;
    const struct hsAppenderHead*    fCurrBlock;
    void*                   fCurrItem;
public:
            hsAppenderIterator(const hsAppender* list = nil);
            
    void    ResetToHead(const hsAppender* list = nil);
    void    ResetToTail(const hsAppender* list = nil);
    void*   Next();
    bool    Next(void* data);
    int     Next(int count, void* data);
    void*   Prev();
    bool    Prev(void* data);

    //  Obsolete interface

    void    Reset(const hsAppender* list = nil) { this->ResetToHead(list); }
};

///////////////////////////////////////////////////////////////////////////////

template <class T> class hsTAppender : hsAppender {
public:
            hsTAppender() : hsAppender(sizeof(T)) {}
            hsTAppender(uint32_t minCount) : hsAppender(sizeof(T), minCount) {}

    hsAppender*     GetAppender() { return this; }
    const hsAppender*   GetAppender() const { return this; }

    uint32_t  Count() const { return hsAppender::Count(); }
    bool      IsEmpty() const { return hsAppender::IsEmpty(); }
    void      Reset() { hsAppender::Reset(); }

    uint32_t  CopyInto(T copy[]) const { return hsAppender::CopyInto(copy); }

    T*      PushHead() { return (T*)hsAppender::PushHead(); }
    void    PushHead(const T& item) { *this->PushHead() = item; }
    T*      PushTail() { return (T*)hsAppender::PushTail(); }
    void    PushTail(const T& item) { *this->PushTail() = item; };
    void    PushTail(int count, const T item[]) { this->hsAppender::PushTail(count, item); };
    T*      PeekHead() const { return (T*)hsAppender::PeekHead(); }
    T*      PeekTail() const { return (T*)hsAppender::PeekTail(); }
    bool    PopHead(T* item = nil) { return hsAppender::PopHead(item); }
    int     PopHead(int count, T item[] = nil) { return hsAppender::PopHead(count, item); }
    bool    PopTail(T* item = nil) { return hsAppender::PopTail(item); }

    //  Alternate intefaces

    T*      Prepend() { return this->PushHead(); }
    T*      Append() { return this->PushTail(); }
    void    PrependItem(const T& item) { this->PushHead(item); }
    void    AppendItem(const T& item) { this->PushTail(item); }

    T*      Push() { return this->PushHead(); }
    void    Push(const T& item) { this->PushHead(item); }
    bool    Pop(T* item = nil) { return this->PopHead(item); }

    T*      Enqueue() { return this->PushTail(); };
    void    Enqueue(const T& item) { this->PushTail(item); }
    void    Enqueue(int count, const T item[]) { this->PushTail(count, item); }
    bool    Dequeue(T* item = nil) { return this->PopHead(item); }
    int     Dequeue(int count, T item[] = nil) { return this->PopHead(count, item); }
};

template <class T> class hsTAppenderIterator : hsAppenderIterator {
public:
            hsTAppenderIterator() : hsAppenderIterator() {}
            hsTAppenderIterator(const hsTAppender<T>* list) : hsAppenderIterator(list->GetAppender()) {}

    void    ResetToHead() { hsAppenderIterator::ResetToHead(nil); }
    void    ResetToHead(const hsTAppender<T>* list) { hsAppenderIterator::ResetToHead(list->GetAppender()); }
    void    ResetToTail() { hsAppenderIterator::ResetToTail(nil); }
    void    ResetToTail(const hsTAppender<T>* list) { hsAppenderIterator::ResetToTail(list->GetAppender()); }
    T*      Next() { return (T*)hsAppenderIterator::Next(); }
    int     Next(T* item) { return hsAppenderIterator::Next(item); }
    T*      Prev() { return (T*)hsAppenderIterator::Prev(); }
    bool  Prev(T* item) { return hsAppenderIterator::Prev(item); }

    //  Obsolete interfaces

    void    Reset() { this->ResetToHead(); }
    void    Reset(const hsTAppender<T>* list) { this->ResetToHead(list); }
};
#endif