#ifndef GAME_ROOT_HPP
#define GAME_ROOT_HPP

#include <godot_cpp/classes/packed_scene.hpp>
#include <godot_cpp/classes/node.hpp>
#include <godot_cpp/templates/hash_map.hpp>
#include <godot_cpp/templates/hash_set.hpp>
#include <godot_cpp/templates/pair.hpp>
#include <godot_cpp/templates/vector.hpp>
#include <godot_cpp/templates/pair.hpp>
#include "game_mode.hpp"
#include "level.hpp"

namespace godot {
class PlayerInput;
class IPlayer;
class SpawnPoint3D;

class GameRoot : public Node {
    GDCLASS(GameRoot, Node);
    static void _bind_methods();
public:
    static GameRoot *get_singleton();
    static bool has_singleton();

    virtual void _enter_tree() override;
    virtual void _exit_tree() override;

    void player_connected();
    void player_disconnected();
    bool initialize_player(IPlayer *player, uint32_t id);

    void reset_game_mode();
protected:
    void grab_singleton();
    void release_singleton();
    uint32_t find_empty_player_slot() const;
    void set_game_mode(Ref<GameMode> prototype);
    virtual IPlayer *spawn_player(uint32_t id);
protected:
    static GameRoot *singleton_instance;

    uint32_t next_player_id{1}; // 0 is the "invalid" player id
    HashMap<uint32_t, Pair<PlayerInput*, IPlayer*>> players{};
    Ref<GameMode> game_mode{};
};

class GameRoot3D : public GameRoot {
    GDCLASS(GameRoot3D, GameRoot);
    static void _bind_methods();
public:
    virtual void _ready() override;
    Level3D *load_level(Ref<PackedScene> level);
    Level3D *load_level_at(Ref<PackedScene> level, Transform3D at);

    void register_spawn_point(SpawnPoint3D *spawn_point);
    void unregister_spawn_point(SpawnPoint3D *spawn_point);

    void set_first_boot_level(Ref<PackedScene> level);
    Ref<PackedScene> get_first_boot_level() const;
protected:
    virtual IPlayer *spawn_player(uint32_t id) override;
private:
    static bool is_valid_level(Ref<PackedScene> &level);
private:
    HashMap<StringName, Level3D*> levels{};
    HashSet<SpawnPoint3D*> spawn_points{};

    Ref<PackedScene> first_boot_level{};
};
}

#endif // !GAME_ROOT_HPP