#ifndef UTILS_PLAYER_HPP
#define UTILS_PLAYER_HPP

#include <cstdint>
#include <optional>
#include <godot_cpp/variant/transform3d.hpp>

namespace gd = godot;

namespace godot { class Node; }

namespace utils {
class PlayerInput;

/*! Interface required for player nodes.
 *
 * Use multiple inheritance and implement IPlayer to make a regular node usable as a player with GameRoot3D.
 */
class IPlayer {
friend class GameRoot3D;
public:
    /*! Called by GameRoot3D when this player is instantiated or assigned a new PlayerInput.
     *
     * Use PlayerInput::listen_to to register input callbacks. There's no need to keep the input pointer around. As the instance is managed by the GameRoot3D.
     */
    virtual void setup_player_input(PlayerInput *input) = 0;
    //! Convert IPlayer instance to node.
    virtual gd::Node *to_node() = 0;
    //! Spawn the player at a given transform, usually the global transform of a SpawnPoint3D.
    virtual void spawn_at_position(gd::Transform3D const &at) = 0;

    uint32_t get_player_id(); //!< Returns the player id assigned to this instance.

private:
    std::optional<uint32_t> player_id{std::nullopt};
};
}

#endif // !UTILS_PLAYER_HPP