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package io.github.linpeilie.utils;

public class StrUtil {

    /**
     * 去掉首部指定长度的字符串并将剩余字符串首字母小写
 例如：str=setName, preLength=3 =》 return name
     *
     * @param str       被处理的字符串
     * @param preLength 去掉的长度
     * @return 处理后的字符串，不符合规范返回null
     */
    public static String removePreAndLowerFirst(CharSequence str, int preLength) {
        if (str == null) {
            return null;
        }
        if (str.length() > preLength) {
            char first = Character.toLowerCase(str.charAt(preLength));
            if (str.length() > preLength + 1) {
                return first + str.toString().substring(preLength + 1);
            }
            return String.valueOf(first);
        } else {
            return str.toString();
        }
    }

    /**
     * 获得set或get或is方法对应的标准属性名
 例如：setName 返回 name
     *
     *      * getName =》name
     * setName =》name
     * isName  =》name
     * 
     *
     * @param getOrSetMethodName Get或Set方法名
     * @return 如果是set或get方法名，返回field， 否则null
     */
    public static String getGeneralField(CharSequence getOrSetMethodName) {
        final String getOrSetMethodNameStr = getOrSetMethodName.toString();
        if (getOrSetMethodNameStr.startsWith("get") || getOrSetMethodNameStr.startsWith("set")) {
            return removePreAndLowerFirst(getOrSetMethodName, 3);
        } else if (getOrSetMethodNameStr.startsWith("is")) {
            return removePreAndLowerFirst(getOrSetMethodName, 2);
        }
        return null;
    }

    public static boolean isEmpty(CharSequence cs) {
        return cs == null || cs.length() == 0;
    }

    public static boolean isNotEmpty(CharSequence cs) {
        return !isEmpty(cs);
    }

    public static boolean equalsIgnoreCase(CharSequence str1, CharSequence str2) {
        if (null == str1) {
            // 只有两个都为null才判断相等
            return str2 == null;
        }
        if (null == str2) {
            // 字符串2空，字符串1非空，直接false
            return false;
        }

        return str1.toString().equalsIgnoreCase(str2.toString());
    }

    public static boolean isBlank(CharSequence str) {
        final int length;
        if ((str == null) || ((length = str.length()) == 0)) {
            return true;
        }

        for (int i = 0; i < length; i++) {
            // 只要有一个非空字符即为非空字符串
            if (false == CharUtils.isBlankChar(str.charAt(i))) {
                return false;
            }
        }

        return true;
    }

}