//

#pragma once

#include <algorithm>

#include "TmplBlockBuffer.tlh"


//-----------------------------------------------------------------------------
//		TmplBuffer_Base
//	基本类
//-----------------------------------------------------------------------------

template <typename T, typename PTR>
T * ECOM::Utility::TmplBuffer_Base <T, PTR>::_GetBufferSetCount (int count)
{
	if (m_nCount >= count)
		return m_Data.get ();

	T * pOld = m_Data.get ();
	T * pNew = new T [count];
	memcpy (pNew, pOld, sizeof (T) * m_nCount);

	Attach (pNew, count);

	return m_Data.get ();
}


template <typename T, typename PTR>
void ECOM::Utility::TmplBuffer_Base <T, PTR>::MemCopyFrom (const T * from, int count)
{
	Release ();

	if (count <= 0)  return;
	if (! from)  return;

	T * toData = new T [count];
	ASSERT (toData);
	memcpy (toData, from, sizeof (T) * count);

	Attach (toData, count);
}

template <typename T, typename PTR>
void ECOM::Utility::TmplBuffer_Base <T, PTR>::MemCopyTo (T * to, int count) const
{
	if (count <= 0)  return;
	if (! to)  return;
	if (IsEmpty ())  return;

	memcpy (to, As (), sizeof (T) * (std::min) (count, m_nCount));
}



//	make a real copy
template <typename T, typename PTR>
void ECOM::Utility::TmplBuffer_Base <T, PTR>::MemCopyTo (TmplBuffer_Base & To) const
{
	if (IsEmpty ())     return;
	if (m_nCount <= 0)  return;

	T * toData = new T [m_nCount];
	ASSERT (toData);
	memcpy (toData, m_Data.get (), sizeof (T) * m_nCount);

	To.Attach (toData, m_nCount);
}



template <typename T, typename PTR>
void ECOM::Utility::TmplBuffer_Base <T, PTR>::ResizeTo (int count, TmplBuffer_Base & To) const
{
	//	如果啥都不想要
	if (count <= 0)  return;

	//	如果我自己本来就是 null
	if (IsEmpty ())
	{
		To._GetBufferSetCount (count);
		return;
	}

	//	如果要的很少, 只需要修改 m_nCount
	if (count <= m_nCount)
	{
		To.m_nCount = count;
		To.m_Data = this->m_Data;
	}
	else
	//	如果要的太多了, 重新分配, 然后 memcpy
	{
		auto pDst = To._GetBufferSetCount (count);
		auto pSrc = As ();
		memcpy (pDst, pSrc, sizeof (T) * m_nCount);
	}
}


template <typename T>
ECOM::Utility::TmplSharedBuffer <T>::TmplSharedBuffer (TmplUniqueBuffer <T> && from)
{
	this->Release ();
	if (from)
	{
		auto count = from.GetCount ();
		auto pc = from.Detach ();
		this->Attach (pc, count);
	}
}


template <typename T>
ECOM::Utility::TmplSharedBuffer <T> & ECOM::Utility::TmplSharedBuffer <T>::operator = (ECOM::Utility::TmplUniqueBuffer <T> && from)
{
	this->Release ();
	if (from)
	{
		auto count = from.GetCount ();
		auto pc = from.Detach ();
		this->Attach (pc, count);
	}

	return (*this);
}