#include <stddef.h>
#include "scene_manager.h"

typedef struct scene_state_t {
    app_context_t* ctx;
    Scene* current;
} scene_state_t;

static scene_state_t g_scene_state;

void scene_manager_init(app_context_t* ctx) {
    g_scene_state.ctx = ctx;
    g_scene_state.current = NULL;
}

void scene_manager_shutdown(void) {
    if (g_scene_state.current && g_scene_state.current->on_exit) {
        g_scene_state.current->on_exit(g_scene_state.ctx);
    }
    g_scene_state.current = NULL;
    g_scene_state.ctx = NULL;
}

void scene_manager_set(Scene* scene) {
    if (g_scene_state.current && g_scene_state.current->on_exit) {
        g_scene_state.current->on_exit(g_scene_state.ctx);
    }
    g_scene_state.current = scene;
    if (g_scene_state.current && g_scene_state.current->on_enter) {
        g_scene_state.current->on_enter(g_scene_state.ctx);
    }
}

Scene* scene_manager_current(void) {
    return g_scene_state.current;
}

void scene_manager_update(float dt) {
    if (g_scene_state.current && g_scene_state.current->on_update) {
        g_scene_state.current->on_update(g_scene_state.ctx, dt);
    }
}

void scene_manager_render(void) {
    if (g_scene_state.current && g_scene_state.current->on_render) {
        g_scene_state.current->on_render(g_scene_state.ctx);
    }
}

void scene_manager_event(const struct sapp_event* ev) {
    if (g_scene_state.current && g_scene_state.current->on_event) {
        g_scene_state.current->on_event(g_scene_state.ctx, ev);
    }
}