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package com.github.wendao76.util;

import com.alibaba.druid.util.StringUtils;
import lombok.extern.slf4j.Slf4j;

import java.lang.reflect.Field;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 * @author wendao76 .
 * @version 1.0.0 .
 */
@Slf4j
public class StringHelper {
    /**
     * Parse string string.
     *
     * @param strList  the str list
     * @param splitStr the split str
     * @return the string
     */
    public static String toStr(List strList, String splitStr){
        StringBuffer stringBuffer = new StringBuffer();
        for(String str : strList){
            stringBuffer.append(str + splitStr);
        }
        return stringBuffer.substring(0, stringBuffer.length()-1);
    }

    /**
     * To str string.
     *
     * @param       the type parameter
     * @param objList  the obj list
     * @param field    the field
     * @param splitStr the split str
     * @return the string
     */
    public static  String toStr(List objList, String field, String splitStr){
        StringBuilder stringBuffer = new StringBuilder();
        for(T obj:objList){
            try {
                Field fld = obj.getClass().getDeclaredField(field);
                fld.setAccessible(true);
                stringBuffer.append(",").append(fld.get(obj));
            } catch (NoSuchFieldException e) {
                log.error(e.getMessage(), e);
                return "";
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return stringBuffer.substring(1);
    }


    /**
     * The constant UNDERLINE.
     */
    // 定义区分驼峰标志
    public static final char UNDERLINE='_';

    /**
     * 驼峰转通过标志分隔字符串
     *
     * @param param the param
     * @return string
     */
    public static String camelToUnderline(String param){
        if (param==null||"".equals(param.trim())){
            return "";
        }
        int len=param.length();
        StringBuilder sb=new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c=param.charAt(i);
            if (Character.isUpperCase(c)){
                sb.append(UNDERLINE);
                sb.append(Character.toLowerCase(c));
            }else{
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * 定义标志转驼峰
     *
     * @param param the param
     * @return string
     */
    public static String underlineToCamel(String param){
        if (param==null||"".equals(param.trim())){
            return "";
        }
        StringBuilder sb=new StringBuilder(param);
        Matcher mc= Pattern.compile("_").matcher(param);
        int i=0;
        while (mc.find()){
            int position=mc.end()-(i++);
            sb.replace(position-1,position+1,sb.substring(position,position+1).toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 定义标志转驼峰
     *
     * @param param the param
     * @param firstCharParse the param
     * @return string
     */
    public static String underlineToCamel(String param, boolean firstCharParse){
        if(StringUtils.isEmpty(param)){
            return "";
        }
        if(firstCharParse){
            param = param.substring(0,1).toUpperCase() +  param.substring(1);
        }
        return underlineToCamel(param);
    }
}