package cn.com.goldenwater.dcproj.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by zx on 14/10/24.
 */
public class StringUtil {

    public static final char UNDERLINE = '_';
    public static String capFirst(String str) {
        String firstC = str.substring(0, 1);

        return str.replaceFirst(firstC, firstC.toUpperCase());
    }


    public static String javaStyle(String columnName) {
        String patternStr = "(_[a-z,A-Z])";
        Pattern pattern = Pattern.compile(patternStr);
        Matcher matcher = pattern.matcher(columnName.toLowerCase());
        StringBuffer buf = new StringBuffer();
        while (matcher.find()) {
            String replaceStr = matcher.group();
            matcher.appendReplacement(buf, replaceStr.toUpperCase());
        }
        matcher.appendTail(buf);
        return buf.toString().replaceAll("_", "");
    }

    // 首字母小写
    public static String lowerInit(String s) {
        if(Character.isLowerCase(s.charAt(0))) {
            return s;
        }else{
            return (new StringBuilder()).append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).toString();
        }
    }

    public static String excuteName(String projectName) {
        String[] patternStr = projectName.split("-");
        StringBuffer buf = new StringBuffer();
        for (String text:patternStr){
            buf.append(upperCase(text));
        }
        return  buf.toString();
    }
    public static String upperCase(String str) {
        char[] ch = str.toCharArray();
        if (ch[0] >= 'a' && ch[0] <= 'z') {
            ch[0] = (char) (ch[0] - 32);
        }
        return new String(ch);
    }
    /**
     * 驼峰格式字符串转换为下划线格式字符串
     *
     * @param param
     * @return
     */
    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();
    }

    /**
     * 下划线格式字符串转换为驼峰格式字符串
     *
     * @param param
     * @return
     */
    public static String underlineToCamel(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 (c == UNDERLINE) {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    public static void main(String[] args)throws Exception {
        System.out.println(excuteName("gw-cloud-mydemo"));
    }
}