Level.h

#pragma once

#include <QGraphicsScene>
#include <QGraphicsItem>
#include <string>
#include <vector>
#include <array>

#include "config.h"
#include "Pacman.h"

class Level
{
	public:

		enum node_type{CHECKPOINT, ENTRANCE, SPAWN, TELEPORT};

	private:

		std::vector<QPoint> _nodes;						// graph nodes
		std::vector < std::array<int, 4> > _neighbors;	// each node has up to 4 neighbors, -1 where there is no neighbor
		std::vector<node_type> _nodeTypes;				// store type of each node
		int _houseEntranceNode;							// house entrance/exit node
		int _pacmanSpawnNode;							// spawn node for Pacman
		int _ghostSpawnNode[4];							// spawn node for the 4 ghosts
		std::vector <QGraphicsItem*> _graph;			// graph for visual debug
		
		// utility methods
		void loadGraph(const std::string & imgPath, QGraphicsScene* scene);
		void loadBalls(const std::string & imgPath, QGraphicsScene* scene);

    public:

		// Singleton design pattern
		static Level* instance();

        // load all items from the given map in the given scene
        // also returns the player object
        Pacman* load(std::string map_name, QGraphicsScene * scene);

		// getters
		const std::vector<QPoint> & nodes(){return _nodes;}
		const std::vector < std::array<int, 4> > & neighbors(){return _neighbors;}
		bool isTeleport(int index){return _nodeTypes[index] == TELEPORT;}
		int ghostSpawnNode(int index){return _ghostSpawnNode[index];}
		int pacmanSpawnNode(){return _pacmanSpawnNode;}
		int houseEntranceNode(){return _houseEntranceNode;}

		// tooglers
		void toogleGraph(){for(auto &i : _graph) i->setVisible(!i->isVisible());}
};