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/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.messaging.util;


/**
 * @author Knut Eilif Husa, Tellu AS
 * Helper class for parsing UUIDs
 */
public class UuidHelper {

    /*
     * This method returns the segment part from a endpointName/alias or an endpointUuid
     * Must only be used for qualified endpoint identificators
     */
    public static String getSegmentFromEndpointNameOrEndpointUuid(String segmentedUuid) {
        int idx = segmentedUuid.lastIndexOf('.');

        if (idx > 0) {
            String seg = segmentedUuid.substring(0, idx);

            /*if(!seg.startsWith(".")){
                    seg = "." + seg;
            }*/
            return seg;
        } else {
            return ".";
        }
    }

    /*
     * This method returns the segment part from an endpointUuid or segment
     * Must not be used on endpointNames/Aliases
     */
    public static String getSegmentFromSegmentOrEndpointUuid(String segmentOrEndpointUuid) {

        if (isSegment(segmentOrEndpointUuid)) {
            return segmentOrEndpointUuid;
        } else {
            return getSegmentFromEndpointNameOrEndpointUuid(segmentOrEndpointUuid);
        }
    }


    /*
     * Checks if the alias is valid for for an segmented endpointUuid
     */
    public static boolean isValidAliasForUuid(String alias, String segmentedUuid) {
        String aliasSegment = getSegmentFromEndpointNameOrEndpointUuid(alias);

        if (aliasSegment.equals("dico") || aliasSegment.equals("localcoos")) {
            return true;
        }

        String segment = getSegmentFromEndpointNameOrEndpointUuid(segmentedUuid);

        if (aliasSegment.equals(segment)) {
            return true;
        }

        return false;
    }

    public static String getParentSegment(String segmentedUuid) {
        String segment = getSegmentFromSegmentOrEndpointUuid(segmentedUuid);

        if (segment.equals(".")) {
            return ""; // segementedUuid on top level
        }

        int idx = segment.lastIndexOf('.');

        if (idx > 0) {
            return segmentedUuid.substring(0, idx);
        } else {
            return ".";
        }
    }

    public static String getQualifiedUuid(String uuid) {

        if (uuid.indexOf("UUID-") == -1) {
            return uuid; //Not an Uuid, returning input parameter
        }

        if (uuid.startsWith("UUID-")) {
            uuid = "." + uuid;
        }

        return uuid;
    }

    public static boolean isUuid(String segmentedUuid) {

        if (segmentedUuid == null) {
            return false;
        }

        if (segmentedUuid.indexOf("UUID-") != -1) {
            return true;
        } else {
            return false;
        }

    }

    public static boolean isRouterUuid(String segmentedUuid) {

        if (segmentedUuid == null) {
            return false;
        }

        if (segmentedUuid.indexOf("UUID-R-") != -1) {
            return true;
        } else {
            return false;
        }
    }

    public static boolean isSegment(String segmentedUuid) {

        if (segmentedUuid == null) {
            return false;
        }

        return segmentedUuid.indexOf("UUID-") == -1;
    }

    public static String replaceSegment(String uuid, String segmentName) {

        if (isSegment(uuid)) {
            return segmentName;
        } else {
            int idx = uuid.lastIndexOf('.');

            if (idx != -1) {

                if (segmentName.equals(".")) {
                    return uuid.substring(idx);
                } else {
                    return segmentName + uuid.substring(idx);
                }
            } else {
                return segmentName;
            }
        }
    }

    /*
     * Checks whether segments is in a parent child relation
     */
    public static boolean isInParentChildRelation(String seg1, String seg2) {

        return (getParentSegment(seg1).equals(seg2) || getParentSegment(seg2).equals(seg1));

    }
}