// **************************************
// Input Functions
// **************************************

void ParseDataFile(ifstream &in, NodeSetPtr NS, EdgeSetPtr ES, TileSetPtr TS, FaceSetPtr FS) {
	string specifier;

	while (1) {
		LoadAlphaString(in, specifier);
		if (in.eof()) break;

		if (specifier == "nodeset") {
			LoadNodes(in, NS);
		} else if (specifier == "edgeset") {
			LoadEdges(in, NS, ES, TS);
		} else if (specifier == "tileset") {
			Error e("Loading tileset not yet implemented");
			throw(e);
		} else if (specifier == "faceset") {
			LoadFaces(in, ES, FS);
		} else {
			// error, unknown specifier
			string tmp("Unknown specifier: ");
			tmp.append(specifier);
			Error e(tmp);
			throw(e);
		}
	}
};

unsigned int LoadNodes(ifstream &in, NodeSetPtr nodes) throw (Error){
	unsigned int count = 0;
	
	if (!GetAndDiscard(in, '{')) { Error e("Missing brace in node definition"); throw(e); }
	
	string specifier;
	while (!GetAndDiscard(in, '}')) {
		LoadAlphaString(in, specifier);
		if (in.eof()) {
			Error e("Unexpected end of file in nodeset");
			throw(e);
		}
		if (specifier == "node") {
			new Node(in, nodes);
			++count;
		} else {
			Error e("Non node definition within nodeset");
			throw(e);
		}
	}
	return count;
};

unsigned int LoadEdges(ifstream &in, NodeSetPtr validNodes, EdgeSetPtr edges, TileSetPtr tiles) {
	unsigned int count = 0;
	
	if (!GetAndDiscard(in, '{')) { Error e("Missing brace in edge definition"); throw(e); }
	
	string specifier;
	while (!GetAndDiscard(in, '}')) {
		LoadAlphaString(in, specifier);
		if (in.eof()) {
			Error e("Unexpected end of file in edgeset");
			throw(e);
		}
		if (specifier == "edge") {
			new Edge(in, validNodes, edges);
			++count;
		} else {
			Error e("Non edge definition within edgeset");
			throw(e);
		}
	}
	
	// now that we have loaded all the edges in this set, work out all the tiles that these create
	CalculateTileSet(edges, tiles);
	return count;
};

unsigned int LoadFaces(ifstream &in, EdgeSetPtr validEdges, FaceSetPtr faces) {
	unsigned int count = 0;
	
	if (!GetAndDiscard(in, '{')) { Error e("Missing brace in face definition"); throw(e); }
	
	string specifier;
	while (!GetAndDiscard(in, '}')) {
		LoadAlphaString(in, specifier);
		if (in.eof()) {
			Error e("Unexpected end of file in faceset");
			throw(e);
		}
		if (specifier == "face") {
			new Face(in, validEdges, faces);
			++count;
		} else {
			Error e("Non edge definition within edgeset");
			throw(e);
		}
	}
	return count;
};