package cc.fascinated.bat.common;

import lombok.experimental.UtilityClass;

/**
 * @author Fascinated (fascinated7)
 */
@UtilityClass
public class StringUtils {
    /**
     * Generates a random string
     *
     * @param length the length of the string
     * @return the random string
     */
    public static String randomString(int length) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < length; i++) {
            stringBuilder.append((char) (Math.random() * 26 + 'a'));
        }
        return stringBuilder.toString();
    }

    /**
     * Escapes meta characters in a string
     *
     * @param inputString the input string
     * @return the string with escaped meta characters
     */
    public static String escapeMetaCharacters(String inputString){
        final String[] metaCharacters = {"\\","^","$","{","}","[","]","(",")",".","*","+","?","|","<",">","-","&","%"};

        for (String metaCharacter : metaCharacters) {
            if (inputString.contains(metaCharacter)) {
                inputString = inputString.replace(metaCharacter, "\\" + metaCharacter);
            }
        }
        return inputString;
    }

    /**
     * Formats bytes into a human-readable format
     *
     * @param bytes the bytes
     * @return the formatted bytes
     */
    public static String formatBytes(long bytes) {
        int unit = 1024;
        if (bytes < unit) return bytes + " B";
        int exp = (int) (Math.log(bytes) / Math.log(unit));
        char pre = "KMGTPE".charAt(exp-1);
        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
    }
}