class versionIssue(object):

    def __init__(self, strVersion):
        self.mListSubV = []
        self.mValid = False
        self.mStrVersion = strVersion

        strAry = self.mStrVersion.split( "." )
        if 2 <= len( strAry ):
            for item in strAry:
                if not item.isnumeric():
                    return
                self.mListSubV.append( int( item ) )
            self.mValid = True

    def valid(self):
        return self.mValid

    def getVersion(self):
        return self.mStrVersion

    def biggerThen( self, other ):
        if not self.valid():
            return False
        if not other.valid():
            return True
        lenMe    = len( self.mListSubV )
        lenOther = len( other.mListSubV )
        lenCmp   = min( lenMe, lenOther )

        for i in range( lenCmp ):
            if self.mListSubV[ i ] > other.mListSubV[ i ]:
                return True
            elif self.mListSubV[ i ] < other.mListSubV[ i ]:
                return False
        return lenMe > lenOther

    def lastVersion(self):
        if self.valid():

            tpList = []
            tpList.extend( self.mListSubV )
            nListLength = len( tpList )
            tpList[ nListLength - 1 ] -= 1

            strVersion = ""

            for i in range( nListLength ):
                if 0 != i:
                    strVersion += "."
                strVersion += str( tpList[i] )

            return versionIssue( strVersion )

        return versionIssue( "" )


    def nextVersion(self):
        if self.valid():

            tpList = []
            tpList.extend( self.mListSubV )
            nListLength = len( tpList )
            tpList[ nListLength - 1 ] += 1

            strVersion = ""

            for i in range( nListLength ):
                if 0 != i:
                    strVersion += "."
                strVersion += str( tpList[i] )

            return versionIssue( strVersion )

        return versionIssue( "" )

    def duplicate(self):
            return versionIssue( self.mStrVersion )