package android.text;

import java.util.Locale;
import java.util.regex.Pattern;

public class TextUtils {
	public static int getLayoutDirectionFromLocale(Locale locale) {
		return 0 /*LTR*/; // FIXME
	}

	// unchanged from android source

	/* split */

	private static String[] EMPTY_STRING_ARRAY = new String[] {};

	public static String[] split(String text, String expression) {
		if (text.length() == 0) {
			return EMPTY_STRING_ARRAY;
		} else {
			return text.split(expression, -1);
		}
	}

	public static String[] split(String text, Pattern pattern) {
		if (text.length() == 0) {
			return EMPTY_STRING_ARRAY;
		} else {
			return pattern.split(text, -1);
		}
	}

	/* join */

	public static String join(CharSequence delimiter, Object[] tokens) {
		StringBuilder sb = new StringBuilder();
		boolean firstTime = true;
		for (Object token : tokens) {
			if (firstTime) {
				firstTime = false;
			} else {
				sb.append(delimiter);
			}
			sb.append(token);
		}
		return sb.toString();
	}

	public static String join(CharSequence delimiter, Iterable tokens) {
		StringBuilder sb = new StringBuilder();
		boolean firstTime = true;
		for (Object token : tokens) {
			if (firstTime) {
				firstTime = false;
			} else {
				sb.append(delimiter);
			}
			sb.append(token);
		}
		return sb.toString();
	}
	// end of unchanged from android source

	public static CharSequence join(Iterable<CharSequence> list) {
		final CharSequence delimiter = ","; // ????
		return join(delimiter, list);
	}

	public static boolean isEmpty(CharSequence str) {
		return str == null || str.length() == 0;
	}

	/**
	 * Returns true if a and b are equal, including if they are both null.
	 * <p><i>Note: In platform versions 1.1 and earlier, this method only worked well if
	 * both the arguments were instances of String.</i></p>
	 * @param a first CharSequence to check
	 * @param b second CharSequence to check
	 * @return true if a and b are equal
	 */
	public static boolean equals(CharSequence a, CharSequence b) {
		if (a == b)
			return true;
		int length;
		if (a != null && b != null && (length = a.length()) == b.length()) {
			if (a instanceof String && b instanceof String) {
				return a.equals(b);
			} else {
				for (int i = 0; i < length; i++) {
					if (a.charAt(i) != b.charAt(i))
						return false;
				}
				return true;
			}
		}
		return false;
	}

	public enum TruncateAt {
		START,
		MIDDLE,
		END,
		MARQUEE,
		END_SMALL
	}

	/**
	 * Returns the original text if it fits in the specified width
	 * given the properties of the specified Paint,
	 * or, if it does not fit, a truncated
	 * copy with ellipsis character added at the specified edge or center.
	 */
	public static CharSequence ellipsize(CharSequence text, TextPaint p, float avail, TruncateAt where) {
		return text;
	}

	public static void getChars(CharSequence s, int start, int end, char[] dest, int destoff) {
		Class<? extends CharSequence> c = s.getClass();
		if (c == String.class)
			((String)s).getChars(start, end, dest, destoff);
		else if (c == StringBuffer.class)
			((StringBuffer)s).getChars(start, end, dest, destoff);
		else if (c == StringBuilder.class)
			((StringBuilder)s).getChars(start, end, dest, destoff);
		else if (s instanceof GetChars)
			((GetChars)s).getChars(start, end, dest, destoff);
		else {
			for (int i = start; i < end; i++)
				dest[destoff++] = s.charAt(i);
		}
	}
}