/*
 * Copyright (c) 2015 EMC Corporation
 * All Rights Reserved
 */
package com.emc.cloud.ucsm.service;

import java.util.regex.Pattern;

public class UcsmVersionChecker {
    /**
     * TODO This code is *copied* from VersionChecker in com.emc.storageos.util package in the controllersvc project. Cannot create a direct
     * dependency on controllersvc
     * project as controllersvc depends on this (compute) project. Best to refactor the code into common area
     */

    /**
     * Compare the two versions
     * 
     * @param minimumSupportedVersion
     * @param version - version discovered
     * @return 0 if versions are equal,
     *         < 0 if version is lower than minimumSupportedVersion,
     *         > 0 if version is higher than minimumSupportedVersion.
     */
    public static int verifyVersionDetails(String minimumSupportedVersion, String version) {
        if (minimumSupportedVersion == null) {
            throw new IllegalArgumentException("minimum supported version received cannot be null");
        } else if (version == null) {
            throw new IllegalArgumentException("discovered version received cannot be null");
        }
        version = version.trim();

        // split by dots, parentheses, and adjoining letters and numbers
        String[] versionToVerifyWith = Pattern.compile("[\\.|\\)|\\(| ]|(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)", Pattern.DOTALL).split(
                minimumSupportedVersion);
        String[] versionProvided = Pattern.compile("[\\.|\\)|\\(| ]|(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)", Pattern.DOTALL).split(version);

        // to remove leading zeroes from the first part. For vnxblock, the version is 05.32
        versionToVerifyWith[0] = versionToVerifyWith[0].replaceFirst("^0*", "");
        versionProvided[0] = versionProvided[0].replaceFirst("^0*", "");

        int i = 0;
        while (i < versionProvided.length && i < versionToVerifyWith.length
                && versionProvided[i].equals(versionToVerifyWith[i])) {
            i++;
        }

        if (i < versionProvided.length && i < versionToVerifyWith.length) {
            int length = (versionToVerifyWith[i].length() > versionProvided[i].length()) ?
                    versionToVerifyWith[i].length() : versionProvided[i].length();
            if (versionToVerifyWith[i].length() > versionProvided[i].length()) {
                versionProvided[i] = String.format("%" + length + 's', versionProvided[i]);
            } else {
                versionToVerifyWith[i] = String.format("%" + length + 's', versionToVerifyWith[i]);
            }
            int diff = versionProvided[i].compareTo(versionToVerifyWith[i]);
            return diff < 0 ? -1 : diff == 0 ? 0 : 1;
        }

        return versionProvided.length < versionToVerifyWith.length ? -1
                : versionProvided.length == versionToVerifyWith.length ? 0 : 1;
    }

}