# Copyright (C) 2015-2018 YouCompleteMe contributors
#
# This file is part of YouCompleteMe.
#
# YouCompleteMe 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 3 of the License, or
# (at your option) any later version.
#
# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.

from ycm.tests.test_utils import ( CurrentWorkingDirectory, ExtendedMock,
                                   MockVimBuffers, MockVimModule, VimBuffer,
                                   VimSign )
MockVimModule()

import contextlib
import os

from ycm.tests import ( PathToTestFile, test_utils, YouCompleteMeInstance,
                        WaitUntilReady )
from ycmd.responses import ( BuildDiagnosticData, Diagnostic, Location, Range,
                             UnknownExtraConf, ServerError )

from hamcrest import ( assert_that, contains_exactly, empty, equal_to,
                       has_entries, has_entry, has_item, has_items, has_key,
                       is_not )
from unittest import TestCase
from unittest.mock import call, MagicMock, patch


def PresentDialog_Confirm_Call( message ):
  """Return a mock.call object for a call to vimsupport.PresentDialog, as called
  why vimsupport.Confirm with the supplied confirmation message"""
  return call( message, [ 'Ok', 'Cancel' ] )


@contextlib.contextmanager
def MockArbitraryBuffer( filetype ):
  """Used via the with statement, set up a single buffer with an arbitrary name
  and no contents. Its filetype is set to the supplied filetype."""

  # Arbitrary, but valid, single buffer open.
  current_buffer = VimBuffer( os.path.realpath( 'TEST_BUFFER' ),
                              filetype = filetype )

  with MockVimBuffers( [ current_buffer ], [ current_buffer ] ):
    yield


@contextlib.contextmanager
def MockEventNotification( response_method, native_filetype_completer = True ):
  """Mock out the EventNotification client request object, replacing the
  Response handler's JsonFromFuture with the supplied |response_method|.
  Additionally mock out YouCompleteMe's FiletypeCompleterExistsForFiletype
  method to return the supplied |native_filetype_completer| parameter, rather
  than querying the server"""

  # We don't want the event to actually be sent to the server, just have it
  # return success
  with patch( 'ycm.client.event_notification.EventNotification.'
              'PostDataToHandlerAsync',
              return_value = MagicMock( return_value=True ) ):

    # We set up a fake a Response (as called by EventNotification.Response)
    # which calls the supplied callback method. Generally this callback just
    # raises an apropriate exception, otherwise it would have to return a mock
    # future object.
    with patch( 'ycm.client.base_request._JsonFromFuture',
                side_effect = response_method ):

      # Filetype available information comes from the server, so rather than
      # relying on that request, we mock out the check. The caller decides if
      # filetype completion is available
      with patch(
        'ycm.youcompleteme.YouCompleteMe.FiletypeCompleterExistsForFiletype',
        return_value = native_filetype_completer ):

        yield


def _Check_FileReadyToParse_Diagnostic_Error( ycm ):
  # Tests Vim sign placement and error/warning count python API
  # when one error is returned.
  def DiagnosticResponse( *args ):
    start = Location( 1, 2, 'TEST_BUFFER' )
    end = Location( 1, 4, 'TEST_BUFFER' )
    extent = Range( start, end )
    diagnostic = Diagnostic( [], start, extent, 'expected ;', 'ERROR' )
    return [ BuildDiagnosticData( diagnostic ) ]

  with MockArbitraryBuffer( 'cpp' ):
    with MockEventNotification( DiagnosticResponse ):
      ycm.OnFileReadyToParse()
      assert_that( ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        contains_exactly(
          VimSign( 1, 'YcmError', 1 )
        )
      )
      assert_that( ycm.GetErrorCount(), equal_to( 1 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 0 ) )

      # Consequent calls to HandleFileParseRequest shouldn't mess with
      # existing diagnostics, when there is no new parse request.
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        contains_exactly(
          VimSign( 1, 'YcmError', 1 )
        )
      )
      assert_that( ycm.GetErrorCount(), equal_to( 1 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 0 ) )

      assert_that( not ycm.ShouldResendFileParseRequest() )

      # New identical requests should result in the same diagnostics.
      ycm.OnFileReadyToParse()
      assert_that( ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        contains_exactly(
          VimSign( 1, 'YcmError', 1 )
        )
      )
      assert_that( ycm.GetErrorCount(), equal_to( 1 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 0 ) )

      assert_that( not ycm.ShouldResendFileParseRequest() )


def _Check_FileReadyToParse_Diagnostic_Warning( ycm ):
  # Tests Vim sign placement/unplacement and error/warning count python API
  # when one warning is returned.
  # Should be called after _Check_FileReadyToParse_Diagnostic_Error
  def DiagnosticResponse( *args ):
    start = Location( 2, 2, 'TEST_BUFFER' )
    end = Location( 2, 4, 'TEST_BUFFER' )
    extent = Range( start, end )
    diagnostic = Diagnostic( [], start, extent, 'cast', 'WARNING' )
    return [ BuildDiagnosticData( diagnostic ) ]

  with MockArbitraryBuffer( 'cpp' ):
    with MockEventNotification( DiagnosticResponse ):
      ycm.OnFileReadyToParse()
      assert_that( ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        contains_exactly(
          VimSign( 2, 'YcmWarning', 1 )
        )
      )
      assert_that( ycm.GetErrorCount(), equal_to( 0 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 1 ) )

      # Consequent calls to HandleFileParseRequest shouldn't mess with
      # existing diagnostics, when there is no new parse request.
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        contains_exactly(
          VimSign( 2, 'YcmWarning', 1 )
        )
      )
      assert_that( ycm.GetErrorCount(), equal_to( 0 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 1 ) )

      assert_that( not ycm.ShouldResendFileParseRequest() )


def _Check_FileReadyToParse_Diagnostic_Clean( ycm ):
  # Tests Vim sign unplacement and error/warning count python API
  # when there are no errors/warnings left.
  # Should be called after _Check_FileReadyToParse_Diagnostic_Warning
  with MockArbitraryBuffer( 'cpp' ):
    with MockEventNotification( MagicMock( return_value = [] ) ):
      ycm.OnFileReadyToParse()
      ycm.HandleFileParseRequest()
      assert_that(
        test_utils.VIM_SIGNS,
        empty()
      )
      assert_that( ycm.GetErrorCount(), equal_to( 0 ) )
      assert_that( ycm.GetWarningCount(), equal_to( 0 ) )
      assert_that( not ycm.ShouldResendFileParseRequest() )


class EventNotificationTest( TestCase ):
  @patch( 'ycm.vimsupport.PostVimMessage', new_callable = ExtendedMock )
  @YouCompleteMeInstance()
  def test_EventNotification_FileReadyToParse_NonDiagnostic_Error(
      self, ycm, post_vim_message ):

    # This test validates the behaviour of YouCompleteMe.HandleFileParseRequest
    # in combination with YouCompleteMe.OnFileReadyToParse when the completer
    # raises an exception handling FileReadyToParse event notification
    ERROR_TEXT = 'Some completer response text'

    def ErrorResponse( *args ):
      raise ServerError( ERROR_TEXT )

    with MockArbitraryBuffer( 'some_filetype' ):
      with MockEventNotification( ErrorResponse ):
        ycm.OnFileReadyToParse()
        assert_that( ycm.FileParseRequestReady() )
        ycm.HandleFileParseRequest()

        # The first call raises a warning
        post_vim_message.assert_has_exact_calls( [
          call( ERROR_TEXT, truncate = True )
        ] )

        # Subsequent calls don't re-raise the warning
        ycm.HandleFileParseRequest()
        post_vim_message.assert_has_exact_calls( [
          call( ERROR_TEXT, truncate = True )
        ] )

        assert_that( not ycm.ShouldResendFileParseRequest() )

        # But it does if a subsequent event raises again
        ycm.OnFileReadyToParse()
        assert_that( ycm.FileParseRequestReady() )
        ycm.HandleFileParseRequest()
        post_vim_message.assert_has_exact_calls( [
          call( ERROR_TEXT, truncate = True ),
          call( ERROR_TEXT, truncate = True )
        ] )

        assert_that( not ycm.ShouldResendFileParseRequest() )


  @YouCompleteMeInstance()
  def test_EventNotification_FileReadyToParse_NonDiagnostic_Error_NonNative(
    self, ycm ):

    test_utils.VIM_MATCHES = []
    test_utils.VIM_SIGNS = []

    with MockArbitraryBuffer( 'some_filetype' ):
      with MockEventNotification( None, False ):
        ycm.OnFileReadyToParse()
        ycm.HandleFileParseRequest()
        assert_that( test_utils.VIM_MATCHES, empty() )
        assert_that( test_utils.VIM_SIGNS, empty() )
        assert_that( not ycm.ShouldResendFileParseRequest() )


  @YouCompleteMeInstance()
  def test_EventNotification_FileReadyToParse_NonDiagnostic_ConfirmExtraConf(
      self, ycm ):

    # This test validates the behaviour of YouCompleteMe.HandleFileParseRequest
    # in combination with YouCompleteMe.OnFileReadyToParse when the completer
    # raises the (special) UnknownExtraConf exception
    FILE_NAME = 'a_file'
    MESSAGE = ( 'Found ' + FILE_NAME + '. Load? \n\n(Question can be '
                'turned off with options, see YCM docs)' )

    def UnknownExtraConfResponse( *args ):
      raise UnknownExtraConf( FILE_NAME )

    with patch( 'ycm.client.base_request.BaseRequest.PostDataToHandler',
                new_callable = ExtendedMock ) as post_data_to_handler:
      with MockArbitraryBuffer( 'some_filetype' ):
        with MockEventNotification( UnknownExtraConfResponse ):

          # When the user accepts the extra conf, we load it
          with patch( 'ycm.vimsupport.PresentDialog',
                      return_value = 0,
                      new_callable = ExtendedMock ) as present_dialog:
            ycm.OnFileReadyToParse()
            assert_that( ycm.FileParseRequestReady() )
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE ),
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'load_extra_conf_file' )
            ] )

            # Subsequent calls don't re-raise the warning
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE )
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'load_extra_conf_file' )
            ] )

            assert_that( ycm.ShouldResendFileParseRequest() )

            # But it does if a subsequent event raises again
            ycm.OnFileReadyToParse()
            assert_that( ycm.FileParseRequestReady() )
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE ),
              PresentDialog_Confirm_Call( MESSAGE ),
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'load_extra_conf_file' ),
              call( { 'filepath': FILE_NAME }, 'load_extra_conf_file' )
            ] )

            assert_that( ycm.ShouldResendFileParseRequest() )

          post_data_to_handler.reset_mock()

          # When the user rejects the extra conf, we reject it
          with patch( 'ycm.vimsupport.PresentDialog',
                      return_value = 1,
                      new_callable = ExtendedMock ) as present_dialog:
            ycm.OnFileReadyToParse()
            assert_that( ycm.FileParseRequestReady() )
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE ),
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'ignore_extra_conf_file' )
            ] )

            # Subsequent calls don't re-raise the warning
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE )
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'ignore_extra_conf_file' )
            ] )

            assert_that( ycm.ShouldResendFileParseRequest() )

            # But it does if a subsequent event raises again
            ycm.OnFileReadyToParse()
            assert_that( ycm.FileParseRequestReady() )
            ycm.HandleFileParseRequest()

            present_dialog.assert_has_exact_calls( [
              PresentDialog_Confirm_Call( MESSAGE ),
              PresentDialog_Confirm_Call( MESSAGE ),
            ] )
            post_data_to_handler.assert_has_exact_calls( [
              call( { 'filepath': FILE_NAME }, 'ignore_extra_conf_file' ),
              call( { 'filepath': FILE_NAME }, 'ignore_extra_conf_file' )
            ] )

            assert_that( ycm.ShouldResendFileParseRequest() )


  @YouCompleteMeInstance()
  def test_EventNotification_FileReadyToParse_Diagnostic_Error_Native(
      self, ycm ):
    test_utils.VIM_SIGNS = []

    _Check_FileReadyToParse_Diagnostic_Error( ycm )
    _Check_FileReadyToParse_Diagnostic_Warning( ycm )
    _Check_FileReadyToParse_Diagnostic_Clean( ycm )


  @patch( 'ycm.youcompleteme.YouCompleteMe._AddUltiSnipsDataIfNeeded' )
  @YouCompleteMeInstance( { 'g:ycm_collect_identifiers_from_tags_files': 1 } )
  def test_EventNotification_FileReadyToParse_TagFiles_UnicodeWorkingDirectory(
      self, ycm, *args ):
    unicode_dir = PathToTestFile( 'uni¢od€' )
    current_buffer_file = PathToTestFile( 'uni¢𐍈d€', 'current_buffer' )
    current_buffer = VimBuffer( name = current_buffer_file,
                                contents = [ 'current_buffer_contents' ],
                                filetype = 'some_filetype' )

    with patch( 'ycm.client.event_notification.EventNotification.'
                'PostDataToHandlerAsync' ) as post_data_to_handler_async:
      with CurrentWorkingDirectory( unicode_dir ):
        with MockVimBuffers( [ current_buffer ], [ current_buffer ], ( 1, 5 ) ):
          ycm.OnFileReadyToParse()

      assert_that(
        # Positional arguments passed to PostDataToHandlerAsync.
        post_data_to_handler_async.call_args[ 0 ],
        contains_exactly(
          has_entries( {
            'filepath': current_buffer_file,
            'line_num': 1,
            'column_num': 6,
            'file_data': has_entries( {
              current_buffer_file: has_entries( {
                'contents': 'current_buffer_contents\n',
                'filetypes': [ 'some_filetype' ]
              } )
            } ),
            'event_name': 'FileReadyToParse',
            'tag_files': has_item( PathToTestFile( 'uni¢od€', 'tags' ) )
          } ),
          'event_notification'
        )
      )


  @patch( 'ycm.youcompleteme.YouCompleteMe._AddUltiSnipsDataIfNeeded' )
  @YouCompleteMeInstance()
  def test_EventNotification_BufferVisit_BuildRequestForCurrentAndUnsavedBuffers( # noqa
      self, ycm, *args ):

    current_buffer_file = os.path.realpath( 'current_buffer' )
    current_buffer = VimBuffer( name = current_buffer_file,
                                number = 1,
                                contents = [ 'current_buffer_contents' ],
                                filetype = 'some_filetype',
                                modified = False )
    modified_buffer_file = os.path.realpath( 'modified_buffer' )
    modified_buffer = VimBuffer( name = modified_buffer_file,
                                 number = 2,
                                 contents = [ 'modified_buffer_contents' ],
                                 filetype = 'some_filetype',
                                 modified = True )

    unmodified_buffer_file = os.path.realpath( 'unmodified_buffer' )
    unmodified_buffer = VimBuffer( name = unmodified_buffer_file,
                                   number = 3,
                                   contents = [ 'unmodified_buffer_contents' ],
                                   filetype = 'some_filetype',
                                   modified = False )

    with patch( 'ycm.client.event_notification.EventNotification.'
                'PostDataToHandlerAsync' ) as post_data_to_handler_async:
      with MockVimBuffers( [ current_buffer,
                             modified_buffer,
                             unmodified_buffer ],
                           [ current_buffer ],
                           ( 1, 5 ) ):
        ycm.OnBufferVisit()

      assert_that(
        # Positional arguments passed to PostDataToHandlerAsync.
        post_data_to_handler_async.call_args[ 0 ],
        contains_exactly(
          has_entries( {
            'filepath': current_buffer_file,
            'line_num': 1,
            'column_num': 6,
            'file_data': has_entries( {
              current_buffer_file: has_entries( {
                'contents': 'current_buffer_contents\n',
                'filetypes': [ 'some_filetype' ]
              } ),
              modified_buffer_file: has_entries( {
                'contents': 'modified_buffer_contents\n',
                'filetypes': [ 'some_filetype' ]
              } )
            } ),
            'event_name': 'BufferVisit'
          } ),
          'event_notification'
        )
      )


  @YouCompleteMeInstance()
  def test_EventNotification_BufferUnload_BuildRequestForDeletedAndUnsavedBuffers( # noqa
      self, ycm ):
    current_buffer_file = os.path.realpath( 'current_βuffer' )
    current_buffer = VimBuffer( name = current_buffer_file,
                                number = 1,
                                contents = [ 'current_buffer_contents' ],
                                filetype = 'some_filetype',
                                modified = True )

    deleted_buffer_file = os.path.realpath( 'deleted_βuffer' )
    deleted_buffer = VimBuffer( name = deleted_buffer_file,
                                number = 2,
                                contents = [ 'deleted_buffer_contents' ],
                                filetype = 'some_filetype',
                                modified = False )

    with patch( 'ycm.client.event_notification.EventNotification.'
                'PostDataToHandlerAsync' ) as post_data_to_handler_async:
      with MockVimBuffers( [ current_buffer, deleted_buffer ],
                           [ current_buffer ] ):
        ycm.OnBufferUnload( deleted_buffer.number )

    assert_that(
      # Positional arguments passed to PostDataToHandlerAsync.
      post_data_to_handler_async.call_args[ 0 ],
      contains_exactly(
        has_entries( {
          'filepath': deleted_buffer_file,
          'line_num': 1,
          'column_num': 1,
          'file_data': has_entries( {
            current_buffer_file: has_entries( {
              'contents': 'current_buffer_contents\n',
              'filetypes': [ 'some_filetype' ]
            } ),
            deleted_buffer_file: has_entries( {
              'contents': 'deleted_buffer_contents\n',
              'filetypes': [ 'some_filetype' ]
            } )
          } ),
          'event_name': 'BufferUnload'
        } ),
        'event_notification'
      )
    )


  @patch( 'ycm.vimsupport.CaptureVimCommand', return_value = """
fooGroup xxx foo bar
             links to Statement""" )
  @YouCompleteMeInstance( { 'g:ycm_seed_identifiers_with_syntax': 1 } )
  def test_EventNotification_FileReadyToParse_SyntaxKeywords_SeedWithCache(
      self, ycm, *args ):

    current_buffer = VimBuffer( name = 'current_buffer',
                                filetype = 'some_filetype' )

    with patch( 'ycm.client.event_notification.EventNotification.'
                'PostDataToHandlerAsync' ) as post_data_to_handler_async:
      with MockVimBuffers( [ current_buffer ], [ current_buffer ] ):
        ycm.OnFileReadyToParse()
        assert_that(
          # Positional arguments passed to PostDataToHandlerAsync.
          post_data_to_handler_async.call_args[ 0 ],
          contains_exactly(
            has_entry( 'syntax_keywords', has_items( 'foo', 'bar' ) ),
            'event_notification'
          )
        )

        # Do not send again syntax keywords in subsequent requests.
        ycm.OnFileReadyToParse()
        assert_that(
          # Positional arguments passed to PostDataToHandlerAsync.
          post_data_to_handler_async.call_args[ 0 ],
          contains_exactly(
            is_not( has_key( 'syntax_keywords' ) ),
            'event_notification'
          )
        )


  @patch( 'ycm.vimsupport.CaptureVimCommand', return_value = """
fooGroup xxx foo bar
             links to Statement""" )
  @YouCompleteMeInstance( { 'g:ycm_seed_identifiers_with_syntax': 1 } )
  def test_EventNotification_FileReadyToParse_SyntaxKeywords_ClearCacheIfRestart( # noqa
      self, ycm, *args ):

    current_buffer = VimBuffer( name = 'current_buffer',
                                filetype = 'some_filetype' )

    with patch( 'ycm.client.event_notification.EventNotification.'
                'PostDataToHandlerAsync' ) as post_data_to_handler_async:
      with MockVimBuffers( [ current_buffer ], [ current_buffer ] ):
        ycm.OnFileReadyToParse()
        assert_that(
          # Positional arguments passed to PostDataToHandlerAsync.
          post_data_to_handler_async.call_args[ 0 ],
          contains_exactly(
            has_entry( 'syntax_keywords', has_items( 'foo', 'bar' ) ),
            'event_notification'
          )
        )

        # Send again the syntax keywords after restarting the server.
        ycm.RestartServer()
        WaitUntilReady()
        ycm.OnFileReadyToParse()
        assert_that(
          # Positional arguments passed to PostDataToHandlerAsync.
          post_data_to_handler_async.call_args[ 0 ],
          contains_exactly(
            has_entry( 'syntax_keywords', has_items( 'foo', 'bar' ) ),
            'event_notification'
          )
        )