package net.sourceforge.pain.logic.fn.util;

import net.sourceforge.pain.data.type.*;

/**
 * PAiN  Date: 05.06.2003  Time: 1:57:10
 */
public final class Utils {

	private final static String[] spaces = new String[20];
	static {
		StringBuffer buf = new StringBuffer(spaces.length);
		for (int i = 0; i < spaces.length; i++) {
			buf.append(' ');
			spaces[i] = buf.toString();
		}
	}

	public static String getStackTrace(Exception e) {
		final StackTraceElement[] stack = e.getStackTrace();
		StringBuffer result = new StringBuffer(2048);
		for (int i = 0; i < stack.length; i++) {
			result.append("\t");
			result.append(stack[i].toString());
			result.append("\n");
		}
		return result.toString();
	}

	public static String whiteSpaceChars(int n) {
		if (n < 10) {
			return spaces[n];
		} else {
			StringBuffer s = new StringBuffer(n);
			while (--n >= 0) {
				s.append(' ');
			}
			return s.toString();
		}
	}

	public static int numStrLen(int num) {
		int strLen = num < 0 ? 2 : 1;
		while (Math.abs(num) > 9) {
			strLen++;
			num = num / 10;
		}
		return strLen;
	}

	public static String classNameWithoutPackage(Class clazz) {
		String name = clazz.getName();
		int i = name.lastIndexOf('.');
		return name.substring(i + 1);
	}

	public static String formatName(String name) {
		return Character.toUpperCase(name.charAt(0)) + name.substring(1);
	}

	public static int parseDirection(final char direction) throws IllegalArgumentException {
		int dir;
		switch (direction) {
			case 'n':
			case 'N':
				dir = LinkedSpace.DIR_NORTH;
				break;
			case 'e':
			case 'E':
				dir = LinkedSpace.DIR_EAST;
				break;
			case 's':
			case 'S':
				dir = LinkedSpace.DIR_SOUTH;
				break;
			case 'w':
			case 'W':
				dir = LinkedSpace.DIR_WEST;
				break;
			case 'u':
			case 'U':
				dir = LinkedSpace.DIR_UP;
				break;
			case 'd':
			case 'D':
				dir = LinkedSpace.DIR_DOWN;
				break;
			default:
				throw new IllegalArgumentException("Illegal Direction:" + direction);
		}
		return dir;
	}

	public static String formattedStacktrace(Exception e) {
		return "{RError!: " + e.getClass().getName() + ":" + e.getMessage() + "\n{w" + getStackTrace(e) + "{x";
	}
}