package com.ruoyi.app.utils;

public class StrKit {
    /**
     * 棣栧瓧姣嶅彉灏忓啓
     */
    public static String firstCharToLowerCase(String str) {
        char firstChar = str.charAt(0);
        if (firstChar >= 'A' && firstChar <= 'Z') {
            char[] arr = str.toCharArray();
            arr[0] += ('a' - 'A');
            return new String(arr);
        }
        return str;
    }

    /**
     * 棣栧瓧姣嶅彉澶у啓
     */
    public static String firstCharToUpperCase(String str) {
        char firstChar = str.charAt(0);
        if (firstChar >= 'a' && firstChar <= 'z') {
            char[] arr = str.toCharArray();
            arr[0] -= ('a' - 'A');
            return new String(arr);
        }
        return str;
    }

    /**
     * 瀛楃涓蹭负 null 鎴栬�呭唴閮ㄥ瓧绗﹀叏閮ㄤ负 ' ' '\t' '\n' '\r' 杩欏洓绫诲瓧绗︽椂杩斿洖 true
     */
    public static boolean isBlank(String str) {
        if (str == null) {
            return true;
        }
        int len = str.length();
        if (len == 0) {
            return true;
        }
        for (int i = 0; i < len; i++) {
            switch (str.charAt(i)) {
                case ' ':
                case '\t':
                case '\n':
                case '\r':
                    // case '\b':
                    // case '\f':
                    break;
                default:
                    return false;
            }
        }
        return true;
    }

    public static boolean notBlank(String str) {
        return !isBlank(str);
    }

    public static boolean notBlank(String... strings) {
        if (strings == null || strings.length == 0) {
            return false;
        }
        for (String str : strings) {
            if (isBlank(str)) {
                return false;
            }
        }
        return true;
    }

    public static boolean notNull(Object... paras) {
        if (paras == null) {
            return false;
        }
        for (Object obj : paras) {
            if (obj == null) {
                return false;
            }
        }
        return true;
    }

    public static String toCamelCase(String stringWithUnderline) {
        if (stringWithUnderline.indexOf('_') == -1) {
            return stringWithUnderline;
        }

        stringWithUnderline = stringWithUnderline.toLowerCase();
        char[] fromArray = stringWithUnderline.toCharArray();
        char[] toArray = new char[fromArray.length];
        int j = 0;
        for (int i = 0; i < fromArray.length; i++) {
            if (fromArray[i] == '_') {
                // 褰撳墠瀛楃涓轰笅鍒掔嚎鏃讹紝灏嗘寚閽堝悗绉讳竴浣嶏紝灏嗙揣闅忎笅鍒掔嚎鍚庨潰涓�涓瓧绗﹁浆鎴愬ぇ鍐欏苟瀛樻斁
                i++;
                if (i < fromArray.length) {
                    toArray[j++] = Character.toUpperCase(fromArray[i]);
                }
            } else {
                toArray[j++] = fromArray[i];
            }
        }
        return new String(toArray, 0, j);
    }

    public static String join(String[] stringArray) {
        StringBuilder sb = new StringBuilder();
        for (String s : stringArray) {
            sb.append(s);
        }
        return sb.toString();
    }

    public static String join(String[] stringArray, String separator) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < stringArray.length; i++) {
            if (i > 0) {
                sb.append(separator);
            }
            sb.append(stringArray[i]);
        }
        return sb.toString();
    }

    public static boolean equals(String a, String b) {
        return a == null ? b == null : a.equals(b);
    }

    public static String getRandomUUID() {
        return java.util.UUID.randomUUID().toString().replace("-", "");
    }


    /**
     * 字符串转换为16进制字符串
     *
     * @param s
     * @return
     */
    public static String stringToHexString(String s) {
        String str = "";
        for (int i = 0; i < s.length(); i++) {
            int ch = s.charAt(i);
            String s4 = Integer.toHexString(ch);
            str = str + s4;
        }
        return str;
    }
    public static String cnToUnicode(String cn) {
        char[] chars = cn.toCharArray();
        String returnStr = "";
        for (int i = 0; i < chars.length; i++) {
            returnStr += "\\u" + Integer.toString(chars[i], 16);
        }
        return returnStr;
    }
}
