//
// Copyright (c) 2014 Sean Farrell
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//

#include "EventEmitter.h"

#include <stdexcept>

EventEmitter::EventEmitter() {}

EventEmitter::~EventEmitter() {}

unsigned int EventEmitter::add_listener(unsigned int event_id, std::function<void ()> cb)
{
    if (!cb)
    {
        throw std::invalid_argument("EventEmitter::add_listener: No callbak provided.");
    }

    std::lock_guard<std::mutex> lock(mutex);

    unsigned int listener_id = ++last_listener;
    listeners.insert(std::make_pair(event_id, std::make_shared<Listener<>>(listener_id, cb)));

    return listener_id;
}

unsigned int EventEmitter::on(unsigned int event_id, std::function<void ()> cb)
{
    return add_listener(event_id, cb);
}

void EventEmitter::remove_listener(unsigned int listener_id)
{
    std::lock_guard<std::mutex> lock(mutex);

    auto i = std::find_if(listeners.begin(), listeners.end(), [&] (std::pair<const unsigned int, std::shared_ptr<ListenerBase>> p) {
        return p.second->id == listener_id;
    });
    if (i != listeners.end())
    {
        listeners.erase(i);
    }
    else
    {
        throw std::invalid_argument("EventEmitter::remove_listener: Invalid listener id.");
    }
}