# Copyright 2017 The Nomulus Authors. 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.

"""Generate java test rules from given test_files.

Instead of having to create one test rule per test in the BUILD file, this rule
provides a handy way to create a bunch of test rules for the specified test
files.

"""


def GenTestRules(name,
                 test_files,
                 deps,
                 exclude_tests=[],
                 default_test_size="small",
                 small_tests=[],
                 medium_tests=[],
                 large_tests=[],
                 enormous_tests=[],
                 resources=[],
                 flaky_tests=[],
                 tags=[],
                 prefix="",
                 jvm_flags=["-XX:MaxPermSize=128m"],
                 args=[],
                 visibility=None,
                 shard_count=1):
  for test in _get_test_names(test_files):
    if test in exclude_tests:
      continue
    test_size = default_test_size
    if test in small_tests:
      test_size = "small"
    if test in medium_tests:
      test_size = "medium"
    if test in large_tests:
      test_size = "large"
    if test in enormous_tests:
      test_size = "enormous"
    flaky = 0
    if (test in flaky_tests) or ("flaky" in tags):
      flaky = 1
    java_class = _package_from_path(
        PACKAGE_NAME + "/" + _strip_right(test, ".java"))
    package = java_class[:java_class.rfind(".")]
    native.java_test(name = prefix + test,
                     runtime_deps = deps,
                     resources = resources,
                     size = test_size,
                     jvm_flags = jvm_flags,
                     args = args,
                     flaky = flaky,
                     tags = tags,
                     test_class = java_class,
                     visibility = visibility,
                     shard_count = shard_count)


def _get_test_names(test_files):
  test_names = []
  for test_file in test_files:
    if not test_file.endswith("Test.java"):
      continue
    test_names += [test_file[:-5]]
  return test_names


def _package_from_path(package_path, src_impls=None):
  src_impls = src_impls or ['javatests/', 'java/']
  for src_impl in src_impls:
    if not src_impl.endswith('/'):
      src_impl += '/'
    index = _index_of_end(package_path, src_impl)
    if index >= 0:
      package_path = package_path[index:]
      break
  return package_path.replace('/', '.')


def _strip_right(str, suffix):
  """Returns str without the suffix if it ends with suffix."""
  if str.endswith(suffix):
    return str[0: len(str) - len(suffix)]
  else:
    return str


def _index_of_end(str, part):
  """If part is in str, return the index of the first character after part.
  Return -1 if part is not in str."""
  index = str.find(part)
  if index >= 0:
    return index + len(part)
  return -1