# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================

"""Tests for session_bundle.gc."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import os
import re


from six.moves import xrange  # pylint: disable=redefined-builtin

import tensorflow as tf

from tensorflow.contrib.session_bundle import gc
from tensorflow.python.framework import test_util
from tensorflow.python.platform import gfile


def tearDownModule():
  gfile.DeleteRecursively(tf.test.get_temp_dir())


class GcTest(test_util.TensorFlowTestCase):

  def testLargestExportVersions(self):
    paths = [gc.Path("/foo", 8), gc.Path("/foo", 9), gc.Path("/foo", 10)]
    newest = gc.largest_export_versions(2)
    n = newest(paths)
    self.assertEquals(n, [gc.Path("/foo", 9), gc.Path("/foo", 10)])

  def testLargestExportVersionsDoesNotDeleteZeroFolder(self):
    paths = [gc.Path("/foo", 0), gc.Path("/foo", 3)]
    newest = gc.largest_export_versions(2)
    n = newest(paths)
    self.assertEquals(n, [gc.Path("/foo", 0), gc.Path("/foo", 3)])

  def testModExportVersion(self):
    paths = [gc.Path("/foo", 4), gc.Path("/foo", 5), gc.Path("/foo", 6),
             gc.Path("/foo", 9)]
    mod = gc.mod_export_version(2)
    self.assertEquals(mod(paths), [gc.Path("/foo", 4), gc.Path("/foo", 6)])
    mod = gc.mod_export_version(3)
    self.assertEquals(mod(paths), [gc.Path("/foo", 6), gc.Path("/foo", 9)])

  def testOneOfEveryNExportVersions(self):
    paths = [gc.Path("/foo", 0), gc.Path("/foo", 1), gc.Path("/foo", 3),
             gc.Path("/foo", 5), gc.Path("/foo", 6), gc.Path("/foo", 7),
             gc.Path("/foo", 8), gc.Path("/foo", 33)]
    one_of = gc.one_of_every_n_export_versions(3)
    self.assertEquals(one_of(paths),
                      [gc.Path("/foo", 3), gc.Path("/foo", 6),
                       gc.Path("/foo", 8), gc.Path("/foo", 33)])

  def testOneOfEveryNExportVersionsZero(self):
    # Zero is a special case since it gets rolled into the first interval.
    # Test that here.
    paths = [gc.Path("/foo", 0), gc.Path("/foo", 4), gc.Path("/foo", 5)]
    one_of = gc.one_of_every_n_export_versions(3)
    self.assertEquals(one_of(paths),
                      [gc.Path("/foo", 0), gc.Path("/foo", 5)])

  def testUnion(self):
    paths = []
    for i in xrange(10):
      paths.append(gc.Path("/foo", i))
    f = gc.union(gc.largest_export_versions(3), gc.mod_export_version(3))
    self.assertEquals(
        f(paths), [gc.Path("/foo", 0), gc.Path("/foo", 3),
                   gc.Path("/foo", 6), gc.Path("/foo", 7),
                   gc.Path("/foo", 8), gc.Path("/foo", 9)])

  def testNegation(self):
    paths = [gc.Path("/foo", 4), gc.Path("/foo", 5), gc.Path("/foo", 6),
             gc.Path("/foo", 9)]
    mod = gc.negation(gc.mod_export_version(2))
    self.assertEquals(
        mod(paths), [gc.Path("/foo", 5), gc.Path("/foo", 9)])
    mod = gc.negation(gc.mod_export_version(3))
    self.assertEquals(
        mod(paths), [gc.Path("/foo", 4), gc.Path("/foo", 5)])

  def testPathsWithParse(self):
    base_dir = os.path.join(tf.test.get_temp_dir(), "paths_parse")
    self.assertFalse(gfile.Exists(base_dir))
    for p in xrange(3):
      gfile.MakeDirs(os.path.join(base_dir, "%d" % p))
    # add a base_directory to ignore
    gfile.MakeDirs(os.path.join(base_dir, "ignore"))

    # create a simple parser that pulls the export_version from the directory.
    def parser(path):
      match = re.match("^" + base_dir + "/(\\d+)$", path.path)
      if not match:
        return None
      return path._replace(export_version=int(match.group(1)))

    self.assertEquals(
        gc.get_paths(base_dir, parser=parser),
        [gc.Path(os.path.join(base_dir, "0"), 0),
         gc.Path(os.path.join(base_dir, "1"), 1),
         gc.Path(os.path.join(base_dir, "2"), 2)])


if __name__ == "__main__":
  tf.test.main()
