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/**
 ***************************************************************************************************
 * @file  ObservableImpl.h
 * @brief AMFObservableImpl common template declaration
 ***************************************************************************************************
 */
#ifndef AMF_ObservableImpl_h
#define AMF_ObservableImpl_h
#pragma once

#include "Thread.h"
#include <list>

namespace amf
{
    template<typename Observer>
    class AMFObservableImpl
    {
    private:
        typedef std::list<Observer*> ObserversList;
        ObserversList m_observers;
    public:
        AMFObservableImpl() : m_observers()
        {}
        virtual ~AMFObservableImpl()
        {
            assert(m_observers.size() == 0);
        }
        virtual void AMF_STD_CALL AddObserver(Observer* pObserver)
        {
            if (pObserver == nullptr)
            {
                return;
            }

            amf_bool found = false;
            AMFLock lock(&m_sc);
            
            for (typename ObserversList::iterator it = m_observers.begin(); it != m_observers.end(); it++)
            {
                if (*it == pObserver)
                {
                    found = true;
                    break;
                }
            }
            if (found == false)
            {
                m_observers.push_back(pObserver);
            }
        }

        virtual void AMF_STD_CALL RemoveObserver(Observer* pObserver)
        {
            AMFLock lock(&m_sc);
            m_observers.remove(pObserver);
        }

    protected:
        void AMF_STD_CALL ClearObservers()
        {
            AMFLock lock(&m_sc);
            m_observers.clear();
        }

        void AMF_STD_CALL NotifyObservers(void  (AMF_STD_CALL Observer::* pEvent)())
        {
            ObserversList tempList;
            {
                AMFLock lock(&m_sc);
                tempList = m_observers;
            }
            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); ++it)
            {
                Observer* pObserver = *it;
                (pObserver->*pEvent)();
            }
        }

        template<typename TArg0>
        void AMF_STD_CALL NotifyObservers(void (AMF_STD_CALL Observer::* pEvent)(TArg0), TArg0 arg0)
        {
            ObserversList tempList;
            {
                AMFLock lock(&m_sc);
                tempList = m_observers;
            }
            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); ++it)
            {
                Observer* pObserver = *it;
                (pObserver->*pEvent)(arg0);
            }
        }
        template<typename TArg0, typename TArg1>
        void AMF_STD_CALL NotifyObservers(void (AMF_STD_CALL Observer::* pEvent)(TArg0, TArg1), TArg0 arg0, TArg1 arg1)
        {
            ObserversList tempList;
            {
                AMFLock lock(&m_sc);
                tempList = m_observers;
            }
            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); it++)
            {
                Observer* pObserver = *it;
                (pObserver->*pEvent)(arg0, arg1);
            }
        }
    private:
        AMFCriticalSection m_sc;
    };
}
#endif //AMF_ObservableImpl_h