package org.jzy3d.io;

import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.jzy3d.maths.Coord3d;

import au.com.bytecode.opencsv.CSVReader;

public class FileDataset {
	public static Coord3d[] loadArray(String filename) throws IOException {
		int size = readNLines(filename);
		float x;
		float y;
		float z;

		Coord3d[] coords = new Coord3d[size];

		// Load file
		CSVReader reader = new CSVReader(new FileReader(filename));
		String[] nextLine;
		int k = 0;
		while ((nextLine = reader.readNext()) != null) {
			if (nextLine.length < 3) 
				continue;
			x = Float.parseFloat(nextLine[0]);
			y = Float.parseFloat(nextLine[1]);
			z = Float.parseFloat(nextLine[2]);
			coords[k++] = new Coord3d(x, y, z);
		}
		reader.close();
		return coords;
	}
	
	public static List loadList(String filename) throws IOException {
		float x;
		float y;
		float z;

		List coords = new ArrayList();;

		// Load file
		CSVReader reader = new CSVReader(new FileReader(filename));
		String[] nextLine;
		while ((nextLine = reader.readNext()) != null) {
			if (nextLine.length < 3) 
				continue;
			x = Float.parseFloat(nextLine[0]);
			y = Float.parseFloat(nextLine[1]);
			z = Float.parseFloat(nextLine[2]);
			coords.add( new Coord3d(x, y, z) );
		}
		reader.close();
		return coords;
	}
	
	/**********************************************/

	protected static int readNLines(String filename) throws IOException {
		CSVReader reader = new CSVReader(new FileReader(filename));
		int n = 0;
		while (reader.readNext() != null)
			n++;
		reader.close();
		return n;
	}

	public static Coord3d[] toArray(List list) {
		Coord3d[] points = new Coord3d[list.size()];
		int k = 0;
		for (Coord3d c : list) {
			points[k++] = c;
		}
		return points;
	}
}