package org.openecomp.sdc.tosca.parser.utils;

import java.util.Arrays;

public class GeneralUtility {

    public static boolean isEmptyString(String str) {
        return str == null || str.trim().isEmpty();
    }


    /**
     * Compares two version strings.
     * <p>
     * Use this instead of String.compareTo() for a non-lexicographical
     * comparison that works for version strings. e.g. "1.10".compareTo("1.6").
     *
     * @param str1 a string of ordinal numbers separated by decimal points.
     * @param str2 a string of ordinal numbers separated by decimal points.
     * @return The result is a negative integer if str1 is _numerically_ less than str2.
     * The result is a positive integer if str1 is _numerically_ greater than str2.
     * The result is zero if the strings are _numerically_ equal.
     * @note It does not work if "1.10" is supposed to be equal to "1.10.0".
     */
    public static int conformanceLevelCompare(String str1, String str2) {
        String[] vals1 = str1.split("\\.");
        String[] vals2 = str2.split("\\.");
        int i = 0;
        // set index to first non-equal ordinal or length of shortest version string
        while (i < vals1.length && i < vals2.length && vals1[i].equals(vals2[i])) {
            i++;
        }
        // compare first non-equal ordinal number
        if (i < vals1.length && i < vals2.length) {
            int diff = Integer.valueOf(vals1[i]).compareTo(Integer.valueOf(vals2[i]));
            return Integer.signum(diff);
        }
        //in case of 0 after the . e.g: "3" = "3.0" or "3.0.0.0" = "3.0"
        str2 = str2.substring(i).replace(".", "");
        str1 = str1.substring(i).replace(".", "");
        if ((!(str1.equals("")))  && Integer.valueOf(str1) == 0){
            vals1 = Arrays.copyOf(vals1, i);
        }
        if ((!(str2.equals("")))  && Integer.valueOf(str2) == 0){
            vals2 = Arrays.copyOf(vals2, i);
        }

        // the strings are equal or one string is a substring of the other
        // e.g. "1.2.3" = "1.2.3" or "1.2.3" < "1.2.3.4"
        return Integer.signum(vals1.length - vals2.length);
    }

}