#ifndef GAME_BG_H
#define GAME_BG_H

#include <nds.h>
#include "game_state.h"

struct BackgroundContext {
    int bg_main_id = -1;
    int bg_sub_id = -1;

    // Fixed-point (8.8) scroll accumulators for smooth 60fps drift
    uint16_t scroll_main_x_fp = 0;
    uint16_t scroll_main_y_fp = 0;
    uint16_t scroll_sub_x_fp = 0;
    uint16_t scroll_sub_y_fp = 0;

    // Animation frame counter & timers
    uint8_t anim_phase = 0;
    uint16_t anim_phase_fp = 0; // Fixed-point (8.8) phase accumulator
    uint8_t pulse_timer = 0; // Triggered when an apple is eaten

    // Cached state to optimize updates
    bool hard_mode = false;
    bool is_cursed = false;
    bool game_over = false;
    Scene scene = Scene::Menu;
};

void bg_setup(BackgroundContext &bg_ctx, int top_console_bg_id, int bottom_console_bg_id);
void bg_update(BackgroundContext &bg_ctx, const GameState &state, uint8_t frame);
void bg_trigger_pulse(BackgroundContext &bg_ctx);
void bg_set_scene(BackgroundContext &bg_ctx, Scene scene, bool hard_mode);

#endif // GAME_BG_H