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package org.openforis.commons.lang;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;

/**
 * 
 * @author S. Ricci
 *
 */
public class Strings {

	public static String firstNotBlank(String... values) {
		for (String value : values) {
			if (StringUtils.isNotBlank(value)) {
				return value;
			}
		}
		return null;
	}
	
	public static > String joinNotBlank(C values, String separator) {
		List notBlankValues = filterNotBlank(values);
		String result = StringUtils.join(notBlankValues, separator);
		return result;
	}
	
	public static String textToHtml(String text) {
		String result;
		result = StringUtils.replace(text, "\n", "
");
		result = StringUtils.replace(result, "\t", "    ");
		return result;
	}
	
	public static String htmlToText(String html) {
		String result = StringEscapeUtils.unescapeHtml4(html);
		result = result.replaceAll("
", "\n");
		return result;
	}

	public static String[] filterNotBlank(String... texts) {
		List result = filterNotBlank(Arrays.asList(texts));
		return result.toArray(new String[result.size()]);
	}

	public static void append(StringBuilder sb, String value, int count) {
		for (int i = 0; i < count; i++) {
			sb.append(value);
		}
	}
	
	public static List prependToList(List values, String prefix) {
		if (StringUtils.isBlank(prefix)) {
			return values;
		} else {
			List result = new ArrayList(values.size());
			for (String val : values) {
				result.add(prefix + val);
			}
			return result;
		}
	}
	
	private static List filterNotBlank(Collection list) {
		return filterNotBlank(new ArrayList(list));
	}
	
	private static List filterNotBlank(List list) {
		List result = new ArrayList(list.size());
		for (String value : list) {
			if (StringUtils.isNotBlank(value)) {
				result.add(value);
			}
		}
		return result;
	}

}