#include "GameStateManager.h"
#include "StateFactories.h"

GameStateManager& GameStateManager::Instance() {
    static GameStateManager instance;
    return instance;
}

void GameStateManager::RequestStateChange(StateID id) {
    hasPendingChange = true;
    pendingState = id;
}

void GameStateManager::Update() {
    if (hasPendingChange) {
        hasPendingChange = false;

        if (currentState) {
            currentState->Exit();
        }

        switch (pendingState) {
            case StateID::MainMenu: currentState = CreateMainMenuState(); break;
            case StateID::Settings: currentState = CreateSettingsState(); break;
            case StateID::Menu1:    currentState = CreateMenu1State();    break;
            case StateID::Menu2:    currentState = CreateMenu2State();    break;
            case StateID::Menu3:    currentState = CreateMenu3State();    break;
        }

        currentState->Enter();
    }

    if (currentState) {
        currentState->Update();
    }
}

void GameStateManager::Render() {
    if (currentState) {
        currentState->Render();
    }
}