#!/usr/bin/env python
# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

import os
import sys
import unittest

#pylint: disable=relative-import
import check_orphan_headers


def _GetRootBasedOnPlatform():
  if sys.platform.startswith('win'):
    return 'C:\\'
  else:
    return '/'


def _GetPath(*path_chunks):
  return os.path.join(_GetRootBasedOnPlatform(),
                      *path_chunks)


class GetBuildGnPathFromFilePathTest(unittest.TestCase):

  def testGetBuildGnFromSameDirectory(self):
    file_path = _GetPath('home', 'projects', 'webrtc', 'base', 'foo.h')
    expected_build_path = _GetPath('home', 'projects', 'webrtc', 'base',
                                   'BUILD.gn')
    file_exists = lambda p: p == _GetPath('home', 'projects', 'webrtc',
                                          'base', 'BUILD.gn')
    src_dir_path = _GetPath('home', 'projects', 'webrtc')
    self.assertEqual(
      expected_build_path,
      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
                                                      file_exists,
                                                      src_dir_path))

  def testGetBuildPathFromParentDirectory(self):
    file_path = _GetPath('home', 'projects', 'webrtc', 'base', 'foo.h')
    expected_build_path = _GetPath('home', 'projects', 'webrtc',
                                   'BUILD.gn')
    file_exists = lambda p: p == _GetPath('home', 'projects', 'webrtc',
                                          'BUILD.gn')
    src_dir_path = _GetPath('home', 'projects', 'webrtc')
    self.assertEqual(
      expected_build_path,
      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
                                                      file_exists,
                                                      src_dir_path))

  def testExceptionIfNoBuildGnFilesAreFound(self):
    with self.assertRaises(check_orphan_headers.NoBuildGnFoundError):
      file_path = _GetPath('home', 'projects', 'webrtc', 'base', 'foo.h')
      file_exists = lambda p: False
      src_dir_path = _GetPath('home', 'projects', 'webrtc')
      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
                                                      file_exists,
                                                      src_dir_path)

  def testExceptionIfFilePathIsNotAnHeader(self):
    with self.assertRaises(check_orphan_headers.WrongFileTypeError):
      file_path = _GetPath('home', 'projects', 'webrtc', 'base', 'foo.cc')
      file_exists = lambda p: False
      src_dir_path = _GetPath('home', 'projects', 'webrtc')
      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
                                                      file_exists,
                                                      src_dir_path)


class GetHeadersInBuildGnFileSourcesTest(unittest.TestCase):

  def testEmptyFileReturnsEmptySet(self):
    self.assertEqual(
      set([]),
      check_orphan_headers.GetHeadersInBuildGnFileSources('', '/a/b'))

  def testReturnsSetOfHeadersFromFileContent(self):
    file_content = """
    # Some comments
    if (is_android) {
      import("//a/b/c.gni")
      import("//d/e/f.gni")
    }
    source_set("foo") {
      sources = ["foo.h"]
      deps = [":bar"]
    }
    rtc_static_library("bar") {
      # Public headers should also be included.
      public = [
        "public_foo.h",
      ]
      sources = [
        "bar.h",
        "bar.cc",
      ]
      deps = [":bar"]
    }
    source_set("baz_foo") {
      sources = ["baz/foo.h"]
    }
    """
    target_abs_path = _GetPath('a', 'b')
    self.assertEqual(
      set([
        _GetPath('a', 'b', 'foo.h'),
        _GetPath('a', 'b', 'bar.h'),
        _GetPath('a', 'b', 'public_foo.h'),
        _GetPath('a', 'b', 'baz', 'foo.h'),
      ]),
      check_orphan_headers.GetHeadersInBuildGnFileSources(file_content,
                                                          target_abs_path))


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