/**
 * @file input.hpp
 * Handles user input received from SDL.
 *
 * Copyright (C) 2022 Clyne Sullivan
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef SYSTEM_INPUT_HPP_
#define SYSTEM_INPUT_HPP_

#include "events/input.hpp"

#include <entityx/entityx.h>

#include <map>

/**
 * @class InputSystem
 * Listens for user input from SDL, and emits input events accordingly.
 */
class InputSystem : public entityx::System<InputSystem>
{
public:
    InputSystem();

    /**
     * Prepares the system for running.
     */
    void configure(entityx::EntityManager& entities,
                   entityx::EventManager& events) final;

    /**
     * Updates the system by checking for SDL events.
     */
    void update(entityx::EntityManager& entities,
                entityx::EventManager& events,
                entityx::TimeDelta dt) final;

private:
    // TODO add 'mod' to comparison check
    // TODO allow binding configuration
    struct Binding {
        SDL_Keycode sym = 0;
        Uint16 mod = 0;

        auto operator<=>(const Binding& other) const {
            return sym <=> other.sym;
        }
    };

    std::map<Binding, std::string> bindings;
    bool isMouseDown;
};

#endif // SYSTEM_INPUT_HPP_