package de.ugoe.cs.cpdp.loader;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import weka.core.Attribute;
import weka.core.DenseInstance;
import weka.core.Instances;
import de.ugoe.cs.util.FileTools;

/**
 * TODO
 * @author sherbold
 *
 */
class AUDIDataLoader implements SingleVersionLoader {

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * de.ugoe.cs.cpdp.loader.AbstractFolderLoader.SingleVersionLoader#load(
	 * java.io.File)
	 */
	@Override
	public Instances load(File file) {
		final String[] lines;
		try {
			lines = FileTools.getLinesFromFile(file.getAbsolutePath());
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
		
		// information about bugs are in another file
		String path = file.getAbsolutePath();
		path = path.substring(0, path.length()-14) + "repro.csv";
		final String[] linesBug;
		try {
			linesBug = FileTools.getLinesFromFile(path);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
		
		// configure Instances
		final ArrayList<Attribute> atts = new ArrayList<Attribute>();

		String[] lineSplit = lines[0].split(";");
		// ignore first three/four and last two columns
		int offset;
		if( lineSplit[3].equals("project_rev") ) {
			offset = 4;
		} else {
			offset = 3;
		}
		for (int j = 0; j < lineSplit.length - (offset+2); j++) {
			atts.add(new Attribute(lineSplit[j + offset]));
		}
		final ArrayList<String> classAttVals = new ArrayList<String>();
		classAttVals.add("0");
		classAttVals.add("1");
		final Attribute classAtt = new Attribute("bug", classAttVals);
		atts.add(classAtt);

		final Instances data = new Instances(file.getName(), atts, 0);
		data.setClass(classAtt);

		// fetch data
		for (int i = 1; i < lines.length; i++) {
			boolean validInstance = true;
			lineSplit = lines[i].split(";");
			String[] lineSplitBug = linesBug[i].split(";");
			double[] values = new double[data.numAttributes()];
			for (int j = 0; validInstance && j < values.length-1; j++) {
				if( lineSplit[j + offset].trim().isEmpty() ) {
					validInstance = false;
				} else {
					values[j] = Double.parseDouble(lineSplit[j + offset].trim());
				}
			}
			if( offset==3 ) {
				values[values.length - 1] = lineSplitBug[7].equals("0") ? 0 : 1;
			} else {
				values[values.length - 1] = lineSplitBug[8].equals("0") ? 0 : 1;
			}
			
			if( validInstance ) {
				data.add(new DenseInstance(1.0, values));
			} else {
				System.out.println("instance " + i + " is invalid");
			}
		}
		return data;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see de.ugoe.cs.cpdp.loader.AbstractFolderLoader.SingleVersionLoader#
	 * filenameFilter(java.lang.String)
	 */
	@Override
	public boolean filenameFilter(String filename) {
		return filename.endsWith("src.csv");
	}

}