#include "scenes.h"
#include <stdlib.h>
#include <sys/types.h>

Scene **sceneStack = NULL;
uint sceneStackDepth = 0;

Scene *getCurrentScene() {
    if (sceneStackDepth == 0) return false;
    return sceneStack[sceneStackDepth - 1];
}

bool InitSceneStack() {
    sceneStack = malloc(sizeof(Scene) * SCENE_STACK_SIZE);
    return sceneStack != NULL;
}

bool AddScene(Scene *newScene) {
    if (newScene == NULL || sceneStackDepth == SCENE_STACK_SIZE)
        return false;

    sceneStack[sceneStackDepth] = newScene;
    sceneStackDepth += 1;

    return true;
}

void DeleteSceneFromStack() {
    Scene *currentScene = getCurrentScene();
    if (currentScene == NULL) return;
    currentScene->Deint(currentScene);
    sceneStack[--sceneStackDepth] = NULL;
}

bool DrawScene() {
    Scene *currentScene = getCurrentScene();
    if (currentScene == NULL) return false;
    return currentScene->Draw(currentScene);
}

bool UpdateScene() {
    Scene *currentScene = getCurrentScene();
    if (currentScene == NULL) return false;
    return currentScene->Update(currentScene);
}