StringUtils

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import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringEscapeUtils;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.List;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 *
 * @Description :  字符串工具类, 继承org.apache.commons.lang3.StringUtils类
 * @Date: 2021/4/27
 *
 */
@Slf4j
public class StringUtils extends org.apache.commons.lang3.StringUtils {

    private static final char SEPARATOR = '_';
    private static final Charset UTF_8 = StandardCharsets.UTF_8;

    /**
     * 转换为字节数组
     *
     * @param str
     * @return
     */
    public static byte[] getBytes(String str) {
        if (str != null) {
            return str.getBytes(UTF_8);
        } else {
            return null;
        }
    }

    public static boolean isEmpty(final String cs) {
        if ("null".equalsIgnoreCase(cs)||"undefined".equalsIgnoreCase(cs)) {
            return true;
        }
        return org.apache.commons.lang3.StringUtils.isEmpty(cs);
    }

    /**
     * 转换为字节数组
     *
     * @param bytes
     * @return
     */
    public static String toString(byte[] bytes) {
        return new String(bytes, UTF_8);
    }

    /**
     * 是否包含字符串
     *
     * @param str 验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inString(String str, String... strs) {
        if (str != null && strs != null) {
            for (String s : strs) {
                if (str.equals(trim(s))) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 是否包含字符串
     *
     * @param str 验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inStringIgnoreCase(String str, String... strs) {
        if (str != null && strs != null) {
            for (String s : strs) {
                if (str.equalsIgnoreCase(trim(s))) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 替换掉HTML标签方法
     */
    public static String stripHtml(String html) {
        if (isBlank(html)) {
            return "";
        }
        // html.replaceAll("\\&[a-zA-Z]{0,9};", "").replaceAll("<[^>]*>", "");
        String regEx = "<.+?>";
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(html);
        String s = m.replaceAll("");
        return s;
    }

    /**
     * 替换为手机识别的HTML，去掉样式及属性，保留回车。
     *
     * @param html
     * @return
     */
    public static String toMobileHtml(String html) {
        if (html == null) {
            return "";
        }
        return html.replaceAll("<([a-z]+?)\\s+?.*?>", "<$1>");
    }

    /**
     * 对txt进行HTML编码，并将\n转换为>br/<、\t转换为   
     *
     * @param txt
     * @return
     */
    public static String toHtml(String txt) {
        if (txt == null) {
            return "";
        }
        return replace(replace(EncodeUtils.encodeHtml(trim(txt)), "\n", "<br/>"), "\t",
                "    ");
    }

    /**
     * 缩略字符串（不区分中英文字符）
     *
     * @param str 目标字符串
     * @param length 截取长度
     * @return
     */
    public static String abbr(String str, int length) {
        if (str == null) {
            return "";
        }
        try {
            StringBuilder sb = new StringBuilder();
            int currentLength = 0;
            for (char c : stripHtml(StringEscapeUtils.unescapeHtml4(str)).toCharArray()) {
                currentLength += String.valueOf(c).getBytes("GBK").length;
                if (currentLength <= length - 3) {
                    sb.append(c);
                } else {
                    sb.append("...");
                    break;
                }
            }
            return sb.toString();
        } catch (UnsupportedEncodingException e) {
            log.error("UnsupportedEncodingException",e);
        }
        return "";
    }

    // 缩略字符串替换Html正则表达式预编译
    private static final Pattern p1 = Pattern.compile("<([a-zA-Z]+)[^<>]*>");

    /**
     * 缩略字符串（适应于与HTML标签的）
     *
     * @param param 目标字符串
     * @param length 截取长度
     * @return
     */
    public static String htmlAbbr(String param, int length) {
        if (param == null) {
            return "";
        }
        StringBuffer result = new StringBuffer();
        int n = 0;
        char temp;
        boolean isCode = false; // 是不是HTML代码
        boolean isHTML = false; // 是不是HTML特殊字符,如 
        for (int i = 0; i < param.length(); i++) {
            temp = param.charAt(i);
            if (temp == '<') {
                isCode = true;
            } else if (temp == '&') {
                isHTML = true;
            } else if (temp == '>' && isCode) {
                n = n - 1;
                isCode = false;
            } else if (temp == ';' && isHTML) {
                isHTML = false;
            }
            try {
                if (!isCode && !isHTML) {
                    n += String.valueOf(temp).getBytes("GBK").length;
                }
            } catch (UnsupportedEncodingException e) {
                log.error("UnsupportedEncodingException",e);
            }

            if (n <= length - 3) {
                result.append(temp);
            } else {
                result.append("...");
                break;
            }
        }
        // 取出截取字符串中的HTML标记
        String tempResult = result.toString().replaceAll("(>)[^<>]*(<?)", "$1$2");
        // 去掉不需要结素标记的HTML标记
        tempResult = tempResult
                .replaceAll("</?(AREA|BASE|BASEFONT|BODY|BR|COL|COLGROUP|DD|DT|FRAME|HEAD|HR|"
                        + "HTML|IMG|INPUT|ISINDEX|LI|LINK|META|OPTION|P|PARAM|TBODY|TD|TFOOT|TH|THEAD|TR|area|base|"
                        + "basefont|body|br|col|colgroup|dd|dt|frame|head|hr|html|img|input|isindex|li|link|meta|"
                        + "option|p|param|tbody|td|tfoot|th|thead|tr)[^<>]*/?>", "");
        // 去掉成对的HTML标记
        tempResult = tempResult.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>", "$2");
        // 用正则表达式取出标记
        Matcher m = p1.matcher(tempResult);
        List<String> endHTML = ListUtils.newArrayList();
        while (m.find()) {
            endHTML.add(m.group(1));
        }
        // 补全不成对的HTML标记
        for (int i = endHTML.size() - 1; i >= 0; i--) {
            result.append("</");
            result.append(endHTML.get(i));
            result.append(">");
        }
        return result.toString();
    }

    /**
     * 首字母大写
     */
    public static String cap(String str) {
        return capitalize(str);
    }

    /**
     * 首字母小写
     */
    public static String uncap(String str) {
        return uncapitalize(str);
    }

    /**
     * 驼峰命名法工具
     *
     * @return camelCase("hello_world") == "helloWorld" capCamelCase("hello_world") == "HelloWorld"
     *         uncamelCase("helloWorld") = "hello_world"
     */
    public static String camelCase(String s) {
        if (s == null) {
            return null;
        }

        s = s.toLowerCase();

        StringBuilder sb = new StringBuilder(s.length());
        boolean upperCase = false;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            if (c == SEPARATOR) {
                upperCase = true;
            } else if (upperCase) {
                sb.append(Character.toUpperCase(c));
                upperCase = false;
            } else {
                sb.append(c);
            }
        }

        return sb.toString();
    }

    /**
     * 驼峰命名法工具
     *
     * @return camelCase("hello_world") == "helloWorld" capCamelCase("hello_world") == "HelloWorld"
     *         uncamelCase("helloWorld") = "hello_world"
     */
    public static String capCamelCase(String s) {
        if (s == null) {
            return null;
        }
        s = camelCase(s);
        return s.substring(0, 1).toUpperCase() + s.substring(1);
    }

    /**
     * 驼峰命名法工具
     *
     * @return camelCase("hello_world") == "helloWorld" capCamelCase("hello_world") == "HelloWorld"
     *         uncamelCase("helloWorld") = "hello_world"
     */
    public static String uncamelCase(String s) {
        if (s == null) {
            return null;
        }

        StringBuilder sb = new StringBuilder();
        boolean upperCase = false;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            boolean nextUpperCase = true;

            if (i < (s.length() - 1)) {
                nextUpperCase = Character.isUpperCase(s.charAt(i + 1));
            }

            if ((i > 0) && Character.isUpperCase(c)) {
                if (!upperCase || !nextUpperCase) {
                    sb.append(SEPARATOR);
                }
                upperCase = true;
            } else {
                upperCase = false;
            }

            sb.append(Character.toLowerCase(c));
        }

        return sb.toString();
    }

    /**
     * 转换为JS获取对象值，生成三目运算返回结果
     *
     * @param objectString 对象串 例如：row.user.id 返回：!row?'':!row.user?'':!row.user.id?'':row.user.id
     */
    public static String jsGetVal(String objectString) {
        StringBuilder result = new StringBuilder();
        StringBuilder val = new StringBuilder();
        String[] vals = split(objectString, ".");
        for (int i = 0; i < vals.length; i++) {
            val.append("." + vals[i]);
            result.append("!" + (val.substring(1)) + "?'':");
        }
        result.append(val.substring(1));
        return result.toString();
    }

    /**
     * 获取随机字符串
     *
     * @param count
     * @return
     */
    public static String getRandomStr(int count) {
        char[] codeSeq = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
                'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5',
                '6', '7', '8', '9'};
        Random random= null;
        try {
            random = SecureRandom.getInstanceStrong();
        } catch (NoSuchAlgorithmException e) {
            log.info("Exception:{}", e.getMessage());
        }
        if(null == random){
            return "";
        }
        StringBuilder s = new StringBuilder();
        for (int i = 0; i < count; i++) {
            String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);
            s.append(r);
        }
        return s.toString();
    }

    /**
     * 获取随机数字
     *
     * @param count
     * @return
     */
    public static String getRandomNum(int count) {
        char[] codeSeq = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
        Random random= null;
        try {
            random = SecureRandom.getInstanceStrong();
        } catch (NoSuchAlgorithmException e) {
            log.info("Exception:{}", e.getMessage());
        }
        if(null == random){
            return "";
        }
        StringBuilder s = new StringBuilder();
        for (int i = 0; i < count; i++) {
            String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);
            s.append(r);
        }
        return s.toString();
    }

    /**
     * 获取树节点名字
     *
     * @param isShowCode 是否显示编码<br>
     *        true or 1：显示在左侧：(code)name<br>
     *        2：显示在右侧：name(code)<br>
     *        false or null：不显示编码：name
     * @param code 编码
     * @param name 名称
     * @return
     */
    public static String getTreeNodeName(String isShowCode, String code, String name) {
        if ("true".equals(isShowCode) || "1".equals(isShowCode)) {
            return "(" + code + ") " + StringUtils.replace(name, " ", "");
        } else if ("2".equals(isShowCode)) {
            return StringUtils.replace(name, " ", "") + " (" + code + ")";
        } else {
            return StringUtils.replace(name, " ", "");
        }
    }

    /**
     * <p>判断字符串是否是whitespace, empty (""), "null" or null.</p>
     *
     * <pre>
     * StringUtils.isBlank(null)      = true
     * StringUtils.isBlank("")        = true
     * StringUtils.isBlank("null")    = true
     * StringUtils.isBlank(" ")       = true
     * StringUtils.isBlank("bob")     = false
     * StringUtils.isBlank("  bob  ") = false
     * </pre>
     * @param cs 被检测字符串
     * @return {@code true} 如果被检测的字符串是null, empty, "null" or whitespace
     */
    public static boolean isBlank(final String cs) {
        if ("null".equalsIgnoreCase(cs)) {
            return true;
        }
        return org.apache.commons.lang3.StringUtils.isBlank(cs);
    }

    // 1Mb的二进制长度为20位：1024*1024
    private static final int ONE_MB_LENGTH = 20;

    public static int getMb(Object obj) {
        if (obj == null) {
            return 0;
        }
        byte[] byteArray = getBytes(JsonUtils.toJson(obj));
        int byteCount = byteArray == null ? 0 : byteArray.length;
        if (byteCount == 0) {
            return 0;
        }
        // size = byteCount / (1*1024*1024)
        // 对除的结果进行下取整，1024刚好为2的10次方。采用位运算进行加速处理。
        int size = byteCount >> ONE_MB_LENGTH;
        return size == 0 ? 1 : size;
    }

    // 1kb的二进制长度为10位：2的10次方 = 1024
    private static final int ONE_KB_LENGTH = 10;

    /**
     * 获取入参大小
     * @param obj
     * @return
     */
    public static int getKb(Object obj) {
        if (null == obj) {
            return 0;
        }
        byte[] byteArray = getBytes(JsonUtils.toJson(obj));
        int byteCount = byteArray.length;
        if (byteCount == 0) {
            return 0;
        }
        // 对除的结果进行下取整，1024刚好为2的10次方。采用位运算进行加速处理。
        int size = byteCount >> ONE_KB_LENGTH;
        return size == 0 ? 1 : size;
    }

    /**
     * 截取字符串长度
     * @param msg 原始字符串
     * @param subLength 要截取的长度
     * @return 截取后返回
     */
    public static String subString(String msg,int subLength) {
        return (msg == null || msg.length() <= subLength) ? msg : msg.substring(subLength);
    }
}