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package org.cip4.jdflib.util;

import java.util.Locale;

import org.cip4.jdflib.core.JDFConstants;

/**
 * class to format integers, longs, doubles etc.
 *
 * @author Rainer Prosi, Heidelberger Druckmaschinen *
 */
public class NumberFormatter
{
	static private final int defaultPrecision = 8;

	/**
	 * set up the defaults
	 */
	public NumberFormatter()
	{
		super();
		zapp0 = true;
	}

	private final static String many0 = "000000000000000000000000000000000000000000000000000000";
	private final static String manyMinus = "-000000000000000000000000000000000000000000000000000000";

	/**
	 * if set, remove trailing 0
	 *
	 * @param zapp0
	 */
	public void setZapp0(final boolean zapp0)
	{
		this.zapp0 = zapp0;
	}

	private boolean zapp0;

	/**
	 * returns a formatted integer with length digits

	 * 
	 *
	 * @param i the integer to format
	 * @param length total length of including leading zeros
	 * @return the formatted string that represents the integer
	 */
	public String formatInt(final int i, final int length)
	{
		String s = Integer.toString(length > 0 && i < 0 ? -i : i);

		if (length > 0)
		{
			final int l0 = s.length();
			if (l0 < length)
			{
				final String z = i < 0 ? manyMinus : many0;
				s = z.substring(0, length - l0) + s;
			}
			else if (i < 0)
			{
				s = '-' + s;
			}
		}
		return StringUtil.intern(s);
	}

	/**
	 * returns a formatted double. Truncates to at most precision digits after the "." 

	 * If precision=0, the . is stripped
	 *
	 * @param d the double to format
	 * @param precision maximum precision, depending on value of zapp0, trailing 0s are discarded or kept
	 * @return the formatted string that represents d TBD handle exp format, null if NaN
	 */
	public String formatDouble(final double d, final int precision)
	{
		final String s;
		if (d == Double.MAX_VALUE)
		{
			s = JDFConstants.POSINF;
		}
		else if (d == -Double.MAX_VALUE)
		{
			s = JDFConstants.NEGINF;
		}
		else if (Double.isNaN(d))
		{
			s = null;
		}
		else
		{
			if (precision > 0)
			{
				String ss = String.format(Locale.US, "%." + precision + "f", d);
				ss = zappTrailing(ss);
				s = ss;
			}
			else if (d > 0)
			{
				s = Integer.toString((int) (d + 0.5));
			}
			else
			{
				s = Integer.toString((int) (d - 0.5));
			}
		}
		return StringUtil.intern(s);
	}

	private String zappTrailing(String s)
	{
		final int posDot = s.indexOf('.');
		if (zapp0 && posDot >= 0)
		{
			int n;

			final int length = s.length();
			for (n = length; n > posDot; n--)
			{
				if (s.charAt(n - 1) != '0')
				{
					break;
				}
			}
			if (s.charAt(n - 1) == '.')
			{
				n--;
			}
			s = s.substring(0, n);
			if ("-0".equals(s))
				s = "0";
		}
		return s;
	}

	/**
	 * returns a formatted double. Truncates to 8 digits after the "." 

	 * If the double is representable as an integer, any ".0" is stripped.
	 *
	 * @param d the double to format
	 * @return the formatted string that represents d TBD handle exp format
	 */
	public String formatDouble(final double d)
	{
		return formatDouble(d, defaultPrecision);
	}
}