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#!/usr/bin/env python

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"""Unit Tests for devflow.versioning

Provides unit tests for module devflow.versioning,

for automatic generation of version strings.

"""

import os

import unittest

from pkg_resources import parse_version

from devflow.versioning import debian_version_from_python_version

class DebianVersionObject(object):

    """Object representing a Debian Version."""

    def __init__(self, pyver):

        self.version = debian_version_from_python_version(pyver)

    def __str__(self):

        return self.version

def debian_compare_versions(a, op, b):

    i = os.system("dpkg --compare-versions %s %s %s" % (a, op, b))

    return i == 0

# Set ordering between DebianVersionObject objects, by adding

# debian_compare_versions

for op in ["lt", "le", "eq", "ne", "gt", "ge"]:

    def gen(op):

        def operator_func(self, other):

            return debian_compare_versions(self.version, op, other.version)

        return operator_func

    setattr(DebianVersionObject, "__%s__" % op, gen(op))

def _random_commit():

    import random

    import string

    return "".join(random.choice(string.hexdigits) for n in xrange(8)).lower()

# Add a random commit number at the end of snapshot versions

def version_with_commit(parse_func, v):

    if "_" in v:

        return parse_func(v + "_" + _random_commit())

    else:

        return parse_func(v)

V = lambda v: version_with_commit(parse_version, v)

D = lambda v: version_with_commit(DebianVersionObject, v)

class TestVersionFunctions(unittest.TestCase):

    def setUp(self):

        self.version_orderings = (

            ("0.14next", ">", "0.14"),

            ("0.14next", ">", "0.14rc7"),

            ("0.14next", "<", "0.14.1"),

            ("0.14rc6", "<", "0.14"),

            ("0.14.2rc6", ">", "0.14.1"),

            ("0.14next_150", "<", "0.14next"),

            ("0.14.1next_150", "<", "0.14.1next"),

            ("0.14.1_149", "<", "0.14.1"),

            ("0.14.1_149", "<", "0.14.1_150"),

            ("0.13next_102", "<", "0.13next"),

            ("0.13next", "<", "0.14rc5_120"),

            ("0.14rc3_120", "<", "0.14rc3"),

            # The following test fails, but versioning.python_version

            # will never try to produce such a version:

            # ("0.14rc3", "<", "0.14_1"),

            ("0.14_120", "<", "0.14"),

            ("0.14", "<", "0.14next_20"),

            ("0.14next_20", "<", "0.14next"),

        )

    def test_python_versions(self):

        for a, op, b in self.version_orderings:

            res = compare(V, a, op, b)

            self.assertTrue(res, "Python version: %s %s %s"

                                 " is not True" % (a, op, b))

    def test_debian_versions(self):

        for a, op, b in self.version_orderings:

            res = compare(D, a, op, b)

            self.assertTrue(res, "Debian version %s %s %s"

                                 " is not True" % (a, op, b))

def compare(function, a, op, b):

    import operator

    str_to_op = {"<": operator.lt,

            "<=": operator.le,

            "==": operator.eq,

            ">": operator.gt,

            ">=": operator.ge}

    try:

        return str_to_op[op](function(a), function(b))

    except KeyError:

        raise ValueError("Unknown operator '%s'" % op)

if __name__ == '__main__':

    unittest.main()