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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.anjocaido.groupmanager.utils;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

import org.anjocaido.groupmanager.GroupManager;
import org.anjocaido.groupmanager.data.Group;

/**
 * 
 * @author gabrielcouto
 */
public abstract class Tasks {

	/**
	 * Gets the exception stack trace as a string.
	 * 
	 * @param exception
	 * @return stack trace as a string
	 */
	public static String getStackTraceAsString(Exception exception) {

		StringWriter sw = new StringWriter();
		PrintWriter pw = new PrintWriter(sw);
		exception.printStackTrace(pw);
		return sw.toString();
	}

	public static void copy(InputStream src, File dst) throws IOException {

		InputStream in = src;
		OutputStream out = new FileOutputStream(dst);

		// Transfer bytes from in to out
		byte[] buf = new byte[1024];
		int len;
		while ((len = in.read(buf)) > 0) {
			out.write(buf, 0, len);
		}
		out.close();
		try {
			in.close();
		} catch (Exception e) {
		}
	}

	public static void copy(File src, File dst) throws IOException {

		InputStream in = new FileInputStream(src);
		copy(in, dst);
	}

	/**
	 * Appends a string to a file
	 * 
	 * @param data
	 * @param file
	 */
	public static void appendStringToFile(String data, String file) throws IOException {

		FileWriter outStream = new FileWriter("." + System.getProperty("file.separator") + file, true);

		BufferedWriter out = new BufferedWriter(outStream);

		data.replaceAll("\n", System.getProperty("line.separator"));

		out.append(new SimpleDateFormat("yyyy-MM-dd HH-mm").format(System.currentTimeMillis()));
		out.append(System.getProperty("line.separator"));
		out.append(data);
		out.append(System.getProperty("line.separator"));

		out.close();
	}

	public static void removeOldFiles(GroupManager gm, File folder) {

		if (folder.isDirectory()) {
			long oldTime = System.currentTimeMillis() - (((long) gm.getGMConfig().getBackupDuration() * 60 * 60) * 1000);
			for (File olds : folder.listFiles()) {
				if (olds.isFile()) {
					if (olds.lastModified() < oldTime) {
						try {
							olds.delete();
						} catch (Exception e) {
						}
					}
				}
			}
		}
	}

	public static String getDateString() {

		GregorianCalendar now = new GregorianCalendar();
		String date = "";
		date += now.get(Calendar.DAY_OF_MONTH);
		date += "-";
		date += now.get(Calendar.HOUR);
		date += "-";
		date += now.get(Calendar.MINUTE);
		return date;
	}

	public static String getStringListInString(List<String> list) {

		if (list == null) {
			return "";
		}
		String result = "";
		for (int i = 0; i < list.size(); i++) {
			result += list.get(i);
			if (i < list.size() - 1) {
				result += ", ";
			}
		}
		return result;
	}

	public static String getStringArrayInString(String[] list) {

		if (list == null) {
			return "";
		}
		String result = "";
		for (int i = 0; i < list.length; i++) {
			result += list[i];
			if (i < ((list.length) - 1)) {
				result += ", ";
			}
		}
		return result;
	}

	public static String getGroupListInString(List<Group> list) {

		if (list == null) {
			return "";
		}
		String result = "";
		for (int i = 0; i < list.size(); i++) {
			result += list.get(i).getName();
			if (i < list.size() - 1) {
				result += ", ";
			}
		}
		return result;
	}

	public static String join(String[] arr, String separator) {

		if (arr.length == 0)
			return "";
		String out = arr[0].toString();
		for (int i = 1; i < arr.length; i++)
			out += separator + arr[i];
		return out;
	}

}