package com.xxx.utils;

import com.google.common.collect.Lists;

import java.util.List;

/**
 * 字符工具類
 */
public final class CharUtil {

    public CharUtil() {
    }

    /**
     * 實際字符串分隔
     * @param charStr 需要分隔的字符串
     * @param catIndex 分隔長度
     * @return List
     */
    private static String[] cut(String charStr,int catIndex){
        String sb = "";
        int charLength = 0;
        for (int i = 0;i<charStr.length() ;i++ ){
            int asciiCode = charStr.codePointAt(i);
            if (asciiCode >=0 && asciiCode<=255){
                charLength+=1;
            } else{
                charLength+=2;
            }
            if (charLength<=catIndex) {
                sb += charStr.charAt(i);
            }else{
                break;
            }
        }
        return new String[]{charStr.substring(sb.length()),sb};
    }


    /**
     * 把字符串按照字符的長度進行分隔
     * @param charStr 需要分隔的字符串
     * @param catIndex 分隔長度
     * @return List
     */
    public static List<String> cutString(String charStr, int catIndex){
        List<String> result = Lists.newArrayList();
        boolean endCond = true;
        while (endCond){
            String[] forCutChar = cut(charStr, catIndex);
            result.add(forCutChar[1]);
            if(forCutChar[0].length() > catIndex){
                charStr = forCutChar[0];
            }else{
                endCond = false;
                if(StringUtil.isNotBlank(forCutChar[0])){
                    result.add(forCutChar[0]);
                }
            }
        }
        return result;
    }
}