# Copyright (C) 2006, 2007, 2009, 2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for breezy/generate_ids.py."""

from ... import tests
from .. import generate_ids


class TestFileIds(tests.TestCase):
    """Test functions which generate file ids."""

    def assertGenFileId(self, regex, filename):
        """gen_file_id should create a file id matching the regex.

        The file id should be ascii, and should be an 8-bit string
        """
        file_id = generate_ids.gen_file_id(filename)
        self.assertContainsRe(file_id, b"^" + regex + b"$")
        # It should be a utf8 file_id, not a unicode one
        self.assertIsInstance(file_id, bytes)
        # gen_file_id should always return ascii file ids.
        file_id.decode("ascii")

    def test_gen_file_id(self):
        gen_file_id = generate_ids.gen_file_id

        # We try to use the filename if possible
        self.assertStartsWith(gen_file_id("bar"), b"bar-")

        # but we squash capitalization, and remove non word characters
        self.assertStartsWith(gen_file_id("Mwoo oof\t m"), b"mwoooofm-")

        # We also remove leading '.' characters to prevent hidden file-ids
        self.assertStartsWith(gen_file_id("..gam.py"), b"gam.py-")
        self.assertStartsWith(gen_file_id("..Mwoo oof\t m"), b"mwoooofm-")

        # we remove unicode characters, and still don't end up with a
        # hidden file id
        self.assertStartsWith(gen_file_id("\xe5\xb5.txt"), b"txt-")

        # Our current method of generating unique ids adds 33 characters
        # plus an serial number (log10(N) characters)
        # to the end of the filename. We now restrict the filename portion to
        # be <= 20 characters, so the maximum length should now be approx < 60

        # Test both case squashing and length restriction
        fid = gen_file_id("A" * 50 + ".txt")
        self.assertStartsWith(fid, b"a" * 20 + b"-")
        self.assertTrue(len(fid) < 60)

        # restricting length happens after the other actions, so
        # we preserve as much as possible
        fid = gen_file_id("\xe5\xb5..aBcd\tefGhijKLMnop\tqrstuvwxyz")
        self.assertStartsWith(fid, b"abcdefghijklmnopqrst-")
        self.assertTrue(len(fid) < 60)

    def test_file_ids_are_ascii(self):
        tail = rb"-\d{14}-[a-z0-9]{16}-\d+"
        self.assertGenFileId(b"foo" + tail, "foo")
        self.assertGenFileId(b"foo" + tail, "foo")
        self.assertGenFileId(b"bar" + tail, "bar")
        self.assertGenFileId(b"br" + tail, "b\xe5r")

    def test__next_id_suffix_sets_suffix(self):
        generate_ids._gen_file_id_suffix = None
        generate_ids._next_id_suffix()
        self.assertNotEqual(None, generate_ids._gen_file_id_suffix)

    def test__next_id_suffix_increments(self):
        generate_ids._gen_file_id_suffix = b"foo-"
        generate_ids._gen_file_id_serial = 1
        try:
            self.assertEqual(b"foo-2", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-3", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-4", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-5", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-6", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-7", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-8", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-9", generate_ids._next_id_suffix())
            self.assertEqual(b"foo-10", generate_ids._next_id_suffix())
        finally:
            # Reset so that all future ids generated in the test suite
            # don't end in 'foo-XXX'
            generate_ids._gen_file_id_suffix = None
            generate_ids._gen_file_id_serial = 0

    def test_gen_root_id(self):
        # Mostly just make sure gen_root_id() exists
        root_id = generate_ids.gen_root_id()
        self.assertStartsWith(root_id, b"tree_root-")


class TestGenRevisionId(tests.TestCase):
    """Test generating revision ids."""

    def assertGenRevisionId(self, regex, username, timestamp=None):
        """gen_revision_id should create a revision id matching the regex."""
        revision_id = generate_ids.gen_revision_id(username, timestamp)
        self.assertContainsRe(revision_id, b"^" + regex + b"$")
        # It should be a utf8 revision_id, not a unicode one
        self.assertIsInstance(revision_id, bytes)
        # gen_revision_id should always return ascii revision ids.
        revision_id.decode("ascii")

    def test_timestamp(self):
        """Passing a timestamp should cause it to be used."""
        self.assertGenRevisionId(rb"user@host-\d{14}-[a-z0-9]{16}", "user@host")
        self.assertGenRevisionId(
            b"user@host-20061102205056-[a-z0-9]{16}", "user@host", 1162500656.688
        )
        self.assertGenRevisionId(
            rb"user@host-20061102205024-[a-z0-9]{16}", "user@host", 1162500624.000
        )

    def test_gen_revision_id_email(self):
        """gen_revision_id uses email address if present."""
        regex = rb"user\+joe_bar@foo-bar\.com-\d{14}-[a-z0-9]{16}"
        self.assertGenRevisionId(regex, "user+joe_bar@foo-bar.com")
        self.assertGenRevisionId(regex, "<user+joe_bar@foo-bar.com>")
        self.assertGenRevisionId(regex, "Joe Bar <user+joe_bar@foo-bar.com>")
        self.assertGenRevisionId(regex, "Joe Bar <user+Joe_Bar@Foo-Bar.com>")
        self.assertGenRevisionId(regex, "Joe B\xe5r <user+Joe_Bar@Foo-Bar.com>")

    def test_gen_revision_id_user(self):
        """If there is no email, fall back to the whole username."""
        tail = rb"-\d{14}-[a-z0-9]{16}"
        self.assertGenRevisionId(b"joe_bar" + tail, "Joe Bar")
        self.assertGenRevisionId(b"joebar" + tail, "joebar")
        self.assertGenRevisionId(b"joe_br" + tail, "Joe B\xe5r")
        self.assertGenRevisionId(
            rb"joe_br_user\+joe_bar_foo-bar.com" + tail,
            "Joe B\xe5r <user+Joe_Bar_Foo-Bar.com>",
        )

    def test_revision_ids_are_ascii(self):
        """gen_revision_id should always return an ascii revision id."""
        tail = rb"-\d{14}-[a-z0-9]{16}"
        self.assertGenRevisionId(b"joe_bar" + tail, "Joe Bar")
        self.assertGenRevisionId(b"joe_bar" + tail, "Joe Bar")
        self.assertGenRevisionId(b"joe@foo" + tail, "Joe Bar <joe@foo>")
        # We cheat a little with this one, because email-addresses shouldn't
        # contain non-ascii characters, but generate_ids should strip them
        # anyway.
        self.assertGenRevisionId(b"joe@f" + tail, "Joe Bar <joe@f\xb6>")
