# coding: utf-8
#
# Copyright (C) 2016 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 __future__ import unicode_literals
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
# Not installing aliases from python-future; it's unreliable and slow.
from builtins import *  # noqa

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

import contextlib
from hamcrest import assert_that, contains, empty, has_entries
from mock import call, MagicMock, patch
from nose.tools import ok_

from ycm.tests import PathToTestFile, YouCompleteMeInstance
from ycmd.responses import ServerError


@contextlib.contextmanager
def MockCompletionRequest( response_method ):
  """Mock out the CompletionRequest, replacing the response handler
  JsonFromFuture with the |response_method| parameter."""

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

    # We set up a fake response (as called by CompletionRequest.RawResponse)
    # which calls the supplied callback method.
    #
    # Note: JsonFromFuture is actually part of ycm.client.base_request, but we
    # must patch where an object is looked up, not where it is defined.
    # See https://docs.python.org/dev/library/unittest.mock.html#where-to-patch
    # for details.
    with patch( 'ycm.client.completion_request.JsonFromFuture',
                side_effect = response_method ):
      yield


@YouCompleteMeInstance()
def SendCompletionRequest_UnicodeWorkingDirectory_test( ycm ):
  unicode_dir = PathToTestFile( 'uni¢𐍈d€' )
  current_buffer = VimBuffer( PathToTestFile( 'uni¢𐍈d€', 'current_buffer' ) )

  def ServerResponse( *args ):
    return { 'completions': [], 'completion_start_column': 1 }

  with CurrentWorkingDirectory( unicode_dir ):
    with MockVimBuffers( [ current_buffer ], current_buffer ):
      with MockCompletionRequest( ServerResponse ):
        ycm.SendCompletionRequest()
        ok_( ycm.CompletionRequestReady() )
        assert_that(
          ycm.GetCompletionResponse(),
          has_entries( {
            'completions': empty(),
            'completion_start_column': 1
          } )
        )


@YouCompleteMeInstance()
@patch( 'ycm.client.base_request._logger', autospec = True )
@patch( 'ycm.vimsupport.PostVimMessage', new_callable = ExtendedMock )
def SendCompletionRequest_ResponseContainingError_test( ycm,
                                                        post_vim_message,
                                                        logger ):
  current_buffer = VimBuffer( 'buffer' )

  def ServerResponse( *args ):
    return {
      'completions': [ {
        'insertion_text': 'insertion_text',
        'menu_text': 'menu_text',
        'extra_menu_info': 'extra_menu_info',
        'detailed_info': 'detailed_info',
        'kind': 'kind',
        'extra_data': {
           'doc_string': 'doc_string'
        }
      } ],
      'completion_start_column': 3,
      'errors': [ {
        'exception': {
           'TYPE': 'Exception'
        },
        'message': 'message',
        'traceback': 'traceback'
      } ]
    }

  with MockVimBuffers( [ current_buffer ], current_buffer ):
    with MockCompletionRequest( ServerResponse ):
      ycm.SendCompletionRequest()
      ok_( ycm.CompletionRequestReady() )
      response = ycm.GetCompletionResponse()
      logger.exception.assert_called_with( 'Error while handling server '
                                           'response' )
      post_vim_message.assert_has_exact_calls( [
        call( 'Exception: message', truncate = True )
      ] )
      assert_that(
        response,
        has_entries( {
          'completions': contains( has_entries( {
            'word': 'insertion_text',
            'abbr': 'menu_text',
            'menu': 'extra_menu_info',
            'info': 'detailed_info\ndoc_string',
            'kind': 'k',
            'dup': 1,
            'empty': 1
          } ) ),
          'completion_start_column': 3
        } )
      )


@YouCompleteMeInstance()
@patch( 'ycm.client.base_request._logger', autospec = True )
@patch( 'ycm.vimsupport.PostVimMessage', new_callable = ExtendedMock )
def SendCompletionRequest_ErrorFromServer_test( ycm,
                                                post_vim_message,
                                                logger ):
  current_buffer = VimBuffer( 'buffer' )
  with MockVimBuffers( [ current_buffer ], current_buffer ):
    with MockCompletionRequest( ServerError( 'Server error' ) ):
      ycm.SendCompletionRequest()
      ok_( ycm.CompletionRequestReady() )
      response = ycm.GetCompletionResponse()
      logger.exception.assert_called_with( 'Error while handling server '
                                           'response' )
      post_vim_message.assert_has_exact_calls( [
        call( 'Server error', truncate = True )
      ] )
      assert_that(
        response,
        has_entries( {
          'completions': empty(),
          'completion_start_column': -1
        } )
      )