rutile-game/src/game/game.cppm

module;

#include <cassert>
#include <memory>
#include <SDL3/SDL.h>

export module game.game;

import core.engine;
import core.renderer;
import game.sprite;
import wrappers.sdl;
import wrappers.sdl_image;

export namespace game
{
    class Game
    {
        // Whether this class is currently instantiated (to prevent multiple instances)
        static bool instantiated_;

        // Reference to the engine
        core::Engine& engine_;

        // Sprite for testing
        std::unique_ptr<Sprite> sprite_{nullptr};

        // Private constructor
        explicit Game(core::Engine& engine)
            : engine_(engine)
        {
            // TODO: Texture should be a reference/pointer to an object managed by a ResourceManager or similar.
            auto texture = sdl_image::LoadTexture(
                engine_.get_renderer().get_sdl_renderer(),
                "assets/neocat.png"
            );

            sprite_ = std::make_unique<Sprite>(std::move(texture), 100, 100);
        }

        public:
            Game() = delete;

            // No copy or move operations because we have a reference to the engine
            Game(const Game&) = delete;
            Game& operator=(const Game&) = delete;
            Game(Game&&) = delete;
            Game& operator=(Game&&) = delete;

            ~Game()
            {
                instantiated_ = false;
            }

            static std::unique_ptr<Game> create(core::Engine& engine)
            {
                // Prevent the class from being instantiated multiple times
                assert(!instantiated_);
                return std::unique_ptr<Game>{
                    new Game(engine)
                };
            }

            // Handles an SDL event. Returns true if the event has been handled.
            bool handle_event(const sdl::Event* event) const
            {
                if (event->type == SDL_EVENT_MOUSE_MOTION) {
                    sprite_->move(
                        event->motion.x - 50,
                        event->motion.y - 50
                    );
                    return true;
                }
                return false;
            }

            void update()
            {
            }

            void render() const
            {
                const auto& renderer = engine_.get_renderer();
                renderer.start_frame();
                sprite_->draw(renderer);
                renderer.finish_frame();
            }

            void shutdown()
            {
            }
    };

    bool Game::instantiated_ = false;
}