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/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
/**
 Display the contents of the current working directory.  
 The format is similar to the Unix ls -l
 This is an example of a bsh command written in Java for speed.
 
 @method void dir( [ String dirname ] )
 */
package bsh.commands;

import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import bsh.CallStack;
import bsh.Interpreter;
import bsh.StringUtil;

public class dir {
	static final String[] months = {
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
	};

	public static String usage() {
		return "usage: dir( String dir )\n       dir()";
	}

	/**
	 * Implement dir() command.
	 * 
	 * @param env
	 *            the interpreter.
	 * @param callstack
	 *            the callstack associated.
	 */
	public static void invoke(Interpreter env, CallStack callstack) {
		String dir = ".";
		invoke(env, callstack, dir);
	}

	/**
	 * Implement dir( String directory ) command.
	 * 
	 * @param env
	 *            the interpreter.
	 * @param callstack
	 *            the callstack associated.
	 * @param dir
	 *            the directory.
	 */
	public static void invoke(Interpreter env, CallStack callstack, String dir) {
		File file;
		try {
			file = env.pathToFile(dir);
		} catch (IOException e) {
			env.println("error reading path: " + e);
			return;
		}

		if (!file.exists() || !file.canRead()) {
			env.println("Can't read " + file);
			return;
		}
		if (!file.isDirectory()) {
			env.println("'" + dir + "' is not a directory");
		}

		String[] files = file.list();
		files = StringUtil.bubbleSort(files);

		for (int i = 0; i < files.length; i++) {
			File f = new File(dir + File.separator + files[i]);
			StringBuffer sb = new StringBuffer();
			sb.append(f.canRead() ? "r" : "-");
			sb.append(f.canWrite() ? "w" : "-");
			sb.append("_");
			sb.append(" ");

			Date d = new Date(f.lastModified());
			GregorianCalendar c = new GregorianCalendar();
			c.setTime(d);
			int day = c.get(Calendar.DAY_OF_MONTH);
			sb.append(months[c.get(Calendar.MONTH)] + " " + day);
			if (day < 10)
				sb.append(" ");

			sb.append(" ");

			// hack to get fixed length 'length' field
			int fieldlen = 8;
			StringBuffer len = new StringBuffer();
			for (int j = 0; j < fieldlen; j++)
				len.append(" ");
			len.insert(0, f.length());
			len.setLength(fieldlen);
			// hack to move the spaces to the front
			int si = len.toString().indexOf(" ");
			if (si != -1) {
				String pad = len.toString().substring(si);
				len.setLength(si);
				len.insert(0, pad);
			}

			sb.append(len.toString());

			sb.append(" " + f.getName());
			if (f.isDirectory())
				sb.append("/");

			env.println(sb.toString());
		}
	}
}