/*
 * Copyright (c) 2009-2021, Albertas Vyšniauskas
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *     * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "EventBus.h"
#include <algorithm>
void EventBus::subscribe(EventType type, IEventHandler &handler) {
	m_handlers.emplace_back(type, &handler);
}
void EventBus::unsubscribe(EventType type, IEventHandler &handler) {
	m_handlers.erase(std::remove_if(m_handlers.begin(), m_handlers.end(), [type, &handler](const std::tuple<EventType, IEventHandler *> &item) {
		return std::get<EventType>(item) == type && std::get<IEventHandler *>(item) == &handler;
	}), m_handlers.end());
}
void EventBus::unsubscribe(IEventHandler &handler) {
	m_handlers.erase(std::remove_if(m_handlers.begin(), m_handlers.end(), [&handler](const std::tuple<EventType, IEventHandler *> &item) {
		return std::get<IEventHandler *>(item) == &handler;
	}), m_handlers.end());
}
bool EventBus::empty() const {
	return m_handlers.empty();
}
void EventBus::trigger(EventType type) {
	for (auto item: m_handlers) {
		if (std::get<EventType>(item) == type) {
			std::get<IEventHandler *>(item)->onEvent(type);
		}
	}
}
