package utils;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import java.net.URLEncoder;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;

public class EmojiUtils {

    /**

     * emoji表情替换

     *

     * @param source 原字符串

     *

     * @param slipStr emoji表情替换成的字符串

     *

     * @return 过滤后的字符串

     */

    public static String filterEmoji(String source, String slipStr) {

        if (StringUtils.isNotBlank(source)) {

            return source.replaceAll("[\\ud800\\udc00-\\udbff\\udfff\\ud800-\\udfff]", slipStr);

        } else {

            return source;

        }

    }

    /**

     * @Description 将字符串中的emoji表情转换成可以在utf-8字符集数据库中保存的格式（表情占4个字节，需要utf8mb4字符集）

     * @param str

     *            待转换字符串

     * @return 转换后字符串

     * @throws UnsupportedEncodingException

     *             exception

     */

    public static String emojiConvert(String str) throws UnsupportedEncodingException {

        String patternString = "([\\x{10000}-\\x{10ffff}\ud800-\udfff])";

        Pattern pattern = Pattern.compile(patternString);

        Matcher matcher = pattern.matcher(str);

        StringBuffer sb = new StringBuffer();

        while (matcher.find()) {

            try {

                matcher.appendReplacement(sb, "[[" + URLEncoder.encode(matcher.group(1), "UTF-8") + "]]");

            } catch (UnsupportedEncodingException e) {

                throw e;

            }

        }

        matcher.appendTail(sb);

        return sb.toString();

    }

    /**

     * @Description 还原utf8数据库中保存的含转换后emoji表情的字符串

     * @param str

     *            转换后的字符串

     * @return 转换前的字符串

     * @throws UnsupportedEncodingException

     *             exception

     */

    public static String emojiRecovery2(String str) throws UnsupportedEncodingException {

        String patternString = "\\[\\[(.*?)\\]\\]";

        Pattern pattern = Pattern.compile(patternString);

        Matcher matcher = pattern.matcher(str);

        StringBuffer sb = new StringBuffer();

        while (matcher.find()) {

            try {

                matcher.appendReplacement(sb, URLDecoder.decode(matcher.group(1), "UTF-8"));

            } catch (UnsupportedEncodingException e) {

                throw e;

            }

        }

        matcher.appendTail(sb);

        return sb.toString();

    }

}