SceneManager.cpp

// =================
// SCENEMANAGER.CPP
// implements scene stack management and forwards game loop calls to the active scene
// =================

#include "header/SceneManager.h"
// constructor initializes the scene change flags to false
SceneManager::SceneManager() : isAdding(false), isReplacing(false), isRemoving(false) {}

// requests a scene change by setting the appropriate flags and storing the new scene
void SceneManager::pushScene(std::unique_ptr<Scene> scene, bool replace) {
    isAdding = true;
    isReplacing = replace;
    newScene = std::move(scene);
}

void SceneManager::popScene() {
    isRemoving = true;
}

void SceneManager::processSceneChanges() {
    if (isRemoving && !sceneStack.empty()) {
        sceneStack.pop();
        isRemoving = false;
    }

    if (isAdding) {
        if (isReplacing && !sceneStack.empty()) {
            sceneStack.pop();
        }

        sceneStack.push(std::move(newScene));
        sceneStack.top()->init();
        isAdding = false;
    }
}

void SceneManager::handleInput(sf::RenderWindow& window) {
    if (!sceneStack.empty()) sceneStack.top()->handleInput(window);
}

void SceneManager::update(float deltaTime) {
    if (!sceneStack.empty()) sceneStack.top()->update(deltaTime);
}

void SceneManager::render(sf::RenderWindow& window) {
    if (!sceneStack.empty()) sceneStack.top()->render(window);
}