// TnzCore includes
#include "tsmartpointer.h"

// tcg includes
#include "tcg/tcg_list.h"

#include "tgldisplaylistsmanager.h"

//***********************************************************************************************
//    Local namespace - declarations
//***********************************************************************************************

namespace
{

struct ProxyReference {
	TGLDisplayListsProxy *m_proxy;
	int m_refCount;

	ProxyReference(TGLDisplayListsProxy *proxy) : m_proxy(proxy), m_refCount() {}
};

} // namespace

//***********************************************************************************************
//    Local namespace - globals
//***********************************************************************************************

namespace
{

tcg::list<ProxyReference> m_proxies;
std::map<TGlContext, int> m_proxyIdsByContext;

} // namespace

//***********************************************************************************************
//    TGLDisplayListsManager  implementation
//***********************************************************************************************

TGLDisplayListsManager *TGLDisplayListsManager::instance()
{
	static TGLDisplayListsManager theInstance;
	return &theInstance;
}

//-----------------------------------------------------------------------------------

int TGLDisplayListsManager::storeProxy(TGLDisplayListsProxy *proxy)
{
	return m_proxies.push_back(ProxyReference(proxy));
}

//-----------------------------------------------------------------------------------

void TGLDisplayListsManager::attachContext(int dlSpaceId, TGlContext context)
{
	m_proxyIdsByContext.insert(std::make_pair(context, dlSpaceId));
	++m_proxies[dlSpaceId].m_refCount;
}

//-----------------------------------------------------------------------------------

void TGLDisplayListsManager::releaseContext(TGlContext context)
{
	std::map<TGlContext, int>::iterator it = m_proxyIdsByContext.find(context);

	assert(it != m_proxyIdsByContext.end());
	if (it == m_proxyIdsByContext.end())
		return;

	int dlSpaceId = it->second;
	if (--m_proxies[dlSpaceId].m_refCount <= 0) {
		// Notify observers first
		observers_container::const_iterator ot, oEnd = observers().end();
		for (ot = observers().begin(); ot != oEnd; ++ot)
			static_cast<Observer *>(*ot)->onDisplayListDestroyed(dlSpaceId);

		// Then, destroy stuff
		delete m_proxies[dlSpaceId].m_proxy;
		m_proxies.erase(dlSpaceId);
	}

	m_proxyIdsByContext.erase(it);
}

//-----------------------------------------------------------------------------------

int TGLDisplayListsManager::displayListsSpaceId(TGlContext context)
{
	std::map<TGlContext, int>::iterator it = m_proxyIdsByContext.find(context);
	return (it == m_proxyIdsByContext.end()) ? -1 : it->second;
}

//-----------------------------------------------------------------------------------

TGLDisplayListsProxy *TGLDisplayListsManager::dlProxy(int dlSpaceId)
{
	return m_proxies[dlSpaceId].m_proxy;
}