package org.jeecg.modules.dnc.utils.file;

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

@Slf4j
public class DocVersionUtil {
    private static final char[] HEX_DIGITS = {'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'};

    /**
     * 生成新的版本号
     * @param oldVersion
     * @return
     */
    public static String generateNewVersion(String oldVersion) {
        if(StringUtils.isBlank(oldVersion))
            return "a.1";
        if(oldVersion.contains(".")) {
            String[] arr = oldVersion.split("\\.");
            if(arr == null || arr.length != 2)
                return null;
            String node = arr[0];
            String num = arr[1];
            if(node.length() != 1)
                return null;
            int site = 1;
            try {
                site = Integer.valueOf(num);
            }catch (NumberFormatException e) {
                log.error(e.getMessage(), e.getStackTrace());
                return null;
            }
            return node + "." + (site + 1);
        }else {
            if(oldVersion.length() != 1)
                return null;
            char node = oldVersion.charAt(0);
            int site = 1;
            for(int i = 0; i < HEX_DIGITS.length; i++) {
                if(HEX_DIGITS[i] == node) {
                    node = HEX_DIGITS[i + 1];
                    return node + "." + site;
                }
            }
            return null;
        }
    }
}