#include "PluginManager.h"
#include <map>
#include <string>
namespace cocos2d { namespace plugin {

typedef struct tagPluginInfo
{
    PluginCreator pfnCreator;
    PluginProtocol* pInstance;
}PluginInfo;

typedef std::map<std::string, PluginInfo> PluginCreatorMap;
typedef std::pair<std::string, PluginInfo> PluginCreatorPair;

static PluginCreatorMap* s_pCreatorMap = NULL;
static PluginManager* s_pPluginManager = NULL;

PluginManager::PluginManager(void)
{
}

PluginManager::~PluginManager()
{
    PluginCreatorMap::iterator it = s_pCreatorMap->begin();
    for (;it != s_pCreatorMap->end();++it)
    {
        if (it->second.pInstance != NULL) {
            delete it->second.pInstance;
            it->second.pInstance = NULL;
        }
    }
}

PluginManager* PluginManager::getInstance()
{
    if (s_pPluginManager == NULL)
    {
        s_pPluginManager = new PluginManager();
    }
    return s_pPluginManager;
}

void PluginManager::end()
{
    if (s_pPluginManager != NULL)
    {
        delete s_pPluginManager;
        s_pPluginManager = NULL;
    }
}

PluginProtocol* PluginManager::loadPlugin(const char* name)
{
    PluginProtocol* pRet = NULL;
    do {
        if (name == NULL || strlen(name) == 0) break;
        PluginCreatorMap::iterator it = s_pCreatorMap->find(name);
        if (it != s_pCreatorMap->end())
        {
            if (it->second.pInstance == NULL) {
                it->second.pInstance = it->second.pfnCreator();
            }
            else {
                // LOGD("The plugin has been loaded, return the loaded instance directly.");
            }
            pRet = it->second.pInstance;
        }
    } while (false);
    return pRet;
}

void PluginManager::unloadPlugin(const char* name)
{
    do {
        if (name == NULL || strlen(name) == 0) break;
        PluginCreatorMap::iterator it = s_pCreatorMap->find(name);
        if (it != s_pCreatorMap->end())
        {
            if (it->second.pInstance != NULL) {
                delete it->second.pInstance;
                it->second.pInstance = NULL;
            }
        }
    } while (false);
}

bool PluginManager::registerPlugin(const char* name, PluginCreator pfnCreator)
{
    if (s_pCreatorMap == NULL) {
        static PluginCreatorMap s_CreatorMap;
        s_pCreatorMap = &s_CreatorMap;
    }
    PluginInfo info;
    info.pfnCreator = pfnCreator;
    info.pInstance = NULL;
    s_pCreatorMap->insert(PluginCreatorPair(name, info));
    return true;
}

}} //namespace cocos2d { namespace plugin {