#pragma once

template <typename MessageIdType, typename MessageBase, typename MessageHandler>
void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::RegisterHandler(MessageIdType a_MessageType, MessageHandler* a_Handler) {
	auto found = std::find_if(m_Handlers[a_MessageType].begin(), m_Handlers[a_MessageType].end(), [&a_Handler](const MessageHandler* handler){
		return a_Handler == handler;
	});
	if (found == m_Handlers[a_MessageType].end())
		m_Handlers[a_MessageType].push_back(a_Handler);
}

template <typename MessageIdType, typename MessageBase, typename MessageHandler>
void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::UnregisterHandler(MessageIdType a_MessageType, MessageHandler* a_Handler) {
	auto found = std::find_if(m_Handlers[a_MessageType].begin(), m_Handlers[a_MessageType].end(), [&a_Handler](const MessageHandler* handler){
		return a_Handler == handler;
	});
	if (found != m_Handlers[a_MessageType].end())
		m_Handlers[a_MessageType].erase(found);
}

template <typename MessageIdType, typename MessageBase, typename MessageHandler>
void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::UnregisterHandler(MessageHandler* a_Handler) {
	for (auto& pair : m_Handlers) {
		if (pair.second.empty())
			continue;

		MessageIdType type = pair.first;

		auto it = std::find_if(pair.second.begin(), pair.second.end(), [&a_Handler](MessageHandler* handler){
			return handler == a_Handler;
		});

		if (it != pair.second.end()) 
			pair.second.erase(it);

	}
}

template <typename MessageIdType, typename MessageBase, typename MessageHandler>
void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::Dispatch(const MessageBase& a_Message) {
	MessageIdType type = a_Message.GetId();
	for (auto& handler : m_Handlers[type]) {
		if (handler)
			a_Message.Dispatch(*handler);
	}
}