/*  PCSX2 - PS2 Emulator for PCs
*  Copyright (C) 2002-2010  PCSX2 Dev Team
*
*  PCSX2 is free software: you can redistribute it and/or modify it under the terms
*  of the GNU Lesser General Public License as published by the Free Software Found-
*  ation, either version 3 of the License, or (at your option) any later version.
*
*  PCSX2 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 PCSX2.
*  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include "common/Threading.h"

using Threading::ScopedLock;

template <typename ListenerType>
typename EventSource<ListenerType>::ListenerIterator EventSource<ListenerType>::Add(ListenerType& listener)
{
	ScopedLock locker(m_listeners_lock);

	// Check for duplicates before adding the event.
	if (IsDebugBuild)
	{
		ListenerIterator iter = m_listeners.begin();
		while (iter != m_listeners.end())
		{
			if ((*iter) == &listener)
				return iter;
			++iter;
		}
	}
	return _AddFast_without_lock(listener);
}

template <typename ListenerType>
void EventSource<ListenerType>::Remove(ListenerType& listener)
{
	ScopedLock locker(m_listeners_lock);
	m_cache_valid = false;
	m_listeners.remove(&listener);
}

template <typename ListenerType>
void EventSource<ListenerType>::Remove(const ListenerIterator& listenerHandle)
{
	ScopedLock locker(m_listeners_lock);
	m_cache_valid = false;
	m_listeners.erase(listenerHandle);
}

template <typename ListenerType>
typename EventSource<ListenerType>::ListenerIterator EventSource<ListenerType>::_AddFast_without_lock(ListenerType& listener)
{
	m_cache_valid = false;
	m_listeners.push_front(&listener);
	return m_listeners.begin();
}


template <typename ListenerType>
__fi void EventSource<ListenerType>::_DispatchRaw(ListenerIterator iter, const ListenerIterator& iend, const EvtParams& evtparams)
{
	while (iter != iend)
	{
		try
		{
			(*iter)->DispatchEvent(evtparams);
		}
		catch (Exception::RuntimeError& ex)
		{
			if (IsDevBuild)
			{
				pxFailDev(L"Ignoring runtime error thrown from event listener (event listeners should not throw exceptions!): " + ex.FormatDiagnosticMessage());
			}
			else
			{
				Console.Error(L"Ignoring runtime error thrown from event listener: " + ex.FormatDiagnosticMessage());
			}
		}
		catch (BaseException& ex)
		{
			if (IsDevBuild)
			{
				ex.DiagMsg() = L"Non-runtime BaseException thrown from event listener .. " + ex.DiagMsg();
				throw;
			}
			Console.Error(L"Ignoring non-runtime BaseException thrown from event listener: " + ex.FormatDiagnosticMessage());
		}
		++iter;
	}
}

template <typename ListenerType>
void EventSource<ListenerType>::Dispatch(const EvtParams& evtparams)
{
	if (!m_cache_valid)
	{
		m_cache_copy = m_listeners;
		m_cache_valid = true;
	}

	if (m_cache_copy.empty())
		return;
	_DispatchRaw(m_cache_copy.begin(), m_cache_copy.end(), evtparams);
}