"""Handles versioning of software packages

Author: Dave Malcolm <dmalcolm@redhat.com>"""
__author__ = 'Dave Malcolm <dmalcolm@redhat.com>'

import re
import unittest

class Version:
    """
    Class representing a version of a software package.
    Stored internally as a list of subversions, from major to minor.
    Overloaded comparison operators ought to work sanely.
    """
    def __init__(self, versionList):
        self.versionList = versionList

    def fromString(versionString):
        """
        Parse a string of the form number.number.number
        """
        return Version(map(int, versionString.split(".")))
    fromString = staticmethod(fromString)

    def __str__(self):
        return ".".join(map(str, self.versionList))

    def __getNum(self):
        tmpList = list(self.versionList)

        while len(tmpList)<5:
            tmpList += [0]

        num = 0
        for i in range(len(tmpList)):
            num *=1000
            num += tmpList[i]
        return num

    def __lt__(self, other):
        return self.__getNum()<other.__getNum()
    def __le__(self, other):
        return self.__getNum()<=other.__getNum()
    def __eq__(self, other):
        return self.__getNum()==other.__getNum()
    def __ne__(self, other):
        return self.__getNum()!=other.__getNum()
    def __gt__(self, other):
        return self.__getNum()>other.__getNum()
    def __ge__(self, other):
        return self.__getNum()>=other.__getNum()

class VersionTests(unittest.TestCase):
    def testLt(self):
        assert Version.fromString("2.0.1") < Version.fromString("2.1.0")
        assert not Version.fromString("1.4.0") < Version.fromString("1.4.0")

    def testLe(self):
        assert Version.fromString("2.0.1") <= Version.fromString("2.1.0")
        assert Version.fromString("1.4.0") <= Version.fromString("1.4.0")

    def testEq(self):
        assert not Version.fromString("2.0.1") == Version.fromString("2.1.0")
        assert Version.fromString("1.4.0") == Version.fromString("1.4.0")

    def testNe(self):
        assert Version.fromString("2.0.1") != Version.fromString("2.1.0")
        assert not Version.fromString("1.4.0") != Version.fromString("1.4.0")

    def testGt(self):
        assert Version.fromString("2.1.0") > Version.fromString("2.0.1")
        assert not Version.fromString("1.4.0") > Version.fromString("1.4.0")

    def testGe(self):
        assert Version.fromString("2.1.0") >= Version.fromString("2.0.1")
        assert Version.fromString("1.4.0") >= Version.fromString("1.4.0")

    def testStr(self):
        assert "2.0.4"==str(Version.fromString("2.0.4"))

    def testParsing(self):
        assert Version.fromString("0") == Version([0])
        assert Version.fromString("0.1") == Version([0, 1])
        assert Version.fromString("1.4.0") == Version([1, 4, 0])

if __name__ == "__main__":
    unittest.main()