# coding: utf-8
#
# Copyright (C) 2015-2016 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,
                                   MockVimBuffers, MockVimModule, VimBuffer )
MockVimModule()

import contextlib
import os

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

from hamcrest import assert_that, contains, has_entries, has_item
from mock import call, MagicMock, patch
from nose.tools import eq_, ok_


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' ] )


def PlaceSign_Call( sign_id, line_num, buffer_num, is_error ):
  sign_name = 'YcmError' if is_error else 'YcmWarning'
  return call( 'sign place {0} line={1} name={2} buffer={3}'
                  .format( sign_id, line_num, sign_name, buffer_num ) )


def UnplaceSign_Call( sign_id, buffer_num ):
  return call( 'try | exec "sign unplace {0} buffer={1}" |'
               ' catch /E158/ | endtry'.format( sign_id, buffer_num ) )


@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' ),
                              window = 1,
                              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.base_request.BaseRequest.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.
    #
    # 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.event_notification.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


@patch( 'ycm.vimsupport.PostVimMessage', new_callable = ExtendedMock )
@YouCompleteMeInstance()
def EventNotification_FileReadyToParse_NonDiagnostic_Error_test(
    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( 'javascript' ):
    with MockEventNotification( ErrorResponse ):
      ycm.OnFileReadyToParse()
      ok_( 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 )
      ] )

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


@patch( 'vim.command' )
@YouCompleteMeInstance()
def EventNotification_FileReadyToParse_NonDiagnostic_Error_NonNative_test(
    ycm, vim_command ):

  with MockArbitraryBuffer( 'javascript' ):
    with MockEventNotification( None, False ):
      ycm.OnFileReadyToParse()
      ycm.HandleFileParseRequest()
      vim_command.assert_not_called()


@patch( 'ycm.client.base_request._LoadExtraConfFile',
        new_callable = ExtendedMock )
@patch( 'ycm.client.base_request._IgnoreExtraConfFile',
        new_callable = ExtendedMock )
@YouCompleteMeInstance()
def EventNotification_FileReadyToParse_NonDiagnostic_ConfirmExtraConf_test(
    ycm, ignore_extra_conf, load_extra_conf ):

  # 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 MockArbitraryBuffer( 'javascript' ):
    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()
        ok_( ycm.FileParseRequestReady() )
        ycm.HandleFileParseRequest()

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE ),
        ] )
        load_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
        ] )

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

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE )
        ] )
        load_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
        ] )

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

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE ),
          PresentDialog_Confirm_Call( MESSAGE ),
        ] )
        load_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
          call( FILE_NAME ),
        ] )

      # 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()
        ok_( ycm.FileParseRequestReady() )
        ycm.HandleFileParseRequest()

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE ),
        ] )
        ignore_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
        ] )

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

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE )
        ] )
        ignore_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
        ] )

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

        present_dialog.assert_has_exact_calls( [
          PresentDialog_Confirm_Call( MESSAGE ),
          PresentDialog_Confirm_Call( MESSAGE ),
        ] )
        ignore_extra_conf.assert_has_exact_calls( [
          call( FILE_NAME ),
          call( FILE_NAME ),
        ] )


@YouCompleteMeInstance()
def EventNotification_FileReadyToParse_Diagnostic_Error_Native_test( ycm ):
  _Check_FileReadyToParse_Diagnostic_Error( ycm )
  _Check_FileReadyToParse_Diagnostic_Warning( ycm )
  _Check_FileReadyToParse_Diagnostic_Clean( ycm )


@patch( 'vim.command' )
def _Check_FileReadyToParse_Diagnostic_Error( ycm, vim_command ):
  # 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()
      ok_( ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      vim_command.assert_has_calls( [
        PlaceSign_Call( 1, 1, 1, True )
      ] )
      eq_( ycm.GetErrorCount(), 1 )
      eq_( ycm.GetWarningCount(), 0 )

      # Consequent calls to HandleFileParseRequest shouldn't mess with
      # existing diagnostics, when there is no new parse request.
      vim_command.reset_mock()
      ok_( not ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      vim_command.assert_not_called()
      eq_( ycm.GetErrorCount(), 1 )
      eq_( ycm.GetWarningCount(), 0 )


@patch( 'vim.command' )
def _Check_FileReadyToParse_Diagnostic_Warning( ycm, vim_command ):
  # 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()
      ok_( ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      vim_command.assert_has_calls( [
        PlaceSign_Call( 2, 2, 1, False ),
        UnplaceSign_Call( 1, 1 )
      ] )
      eq_( ycm.GetErrorCount(), 0 )
      eq_( ycm.GetWarningCount(), 1 )

      # Consequent calls to HandleFileParseRequest shouldn't mess with
      # existing diagnostics, when there is no new parse request.
      vim_command.reset_mock()
      ok_( not ycm.FileParseRequestReady() )
      ycm.HandleFileParseRequest()
      vim_command.assert_not_called()
      eq_( ycm.GetErrorCount(), 0 )
      eq_( ycm.GetWarningCount(), 1 )


@patch( 'vim.command' )
def _Check_FileReadyToParse_Diagnostic_Clean( ycm, vim_command ):
  # 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()
      vim_command.assert_has_calls( [
        UnplaceSign_Call( 2, 1 )
      ] )
      eq_( ycm.GetErrorCount(), 0 )
      eq_( ycm.GetWarningCount(), 0 )


@patch( 'ycm.youcompleteme.YouCompleteMe._AddUltiSnipsDataIfNeeded' )
@YouCompleteMeInstance( { 'collect_identifiers_from_tags_files': 1 } )
def EventNotification_FileReadyToParse_TagFiles_UnicodeWorkingDirectory_test(
    ycm, *args ):
  unicode_dir = PathToTestFile( 'uni¢𐍈d€' )
  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.base_request.BaseRequest.'
              'PostDataToHandlerAsync' ) as post_data_to_handler_async:
    with CurrentWorkingDirectory( unicode_dir ):
      with MockVimBuffers( [ current_buffer ], current_buffer, ( 6, 5 ) ):
        ycm.OnFileReadyToParse()

    assert_that(
      # Positional arguments passed to PostDataToHandlerAsync.
      post_data_to_handler_async.call_args[ 0 ],
      contains(
        has_entries( {
          'filepath': current_buffer_file,
          'line_num': 6,
          '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¢𐍈d€', 'tags' ) )
        } ),
        'event_notification'
      )
    )


@patch( 'ycm.youcompleteme.YouCompleteMe._AddUltiSnipsDataIfNeeded' )
@YouCompleteMeInstance()
def EventNotification_BufferVisit_BuildRequestForCurrentAndUnsavedBuffers_test(
    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.base_request.BaseRequest.'
              'PostDataToHandlerAsync' ) as post_data_to_handler_async:
    with MockVimBuffers( [ current_buffer, modified_buffer, unmodified_buffer ],
                         current_buffer,
                         ( 3, 5 ) ):
      ycm.OnBufferVisit()

    assert_that(
      # Positional arguments passed to PostDataToHandlerAsync.
      post_data_to_handler_async.call_args[ 0 ],
      contains(
        has_entries( {
          'filepath': current_buffer_file,
          'line_num': 3,
          '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 EventNotification_BufferUnload_BuildRequestForDeletedAndUnsavedBuffers_test(
    ycm ):
  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 = True )

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

  with patch( 'ycm.client.base_request.BaseRequest.'
              'PostDataToHandlerAsync' ) as post_data_to_handler_async:
    with MockVimBuffers( [ current_buffer, deleted_buffer ], current_buffer ):
      ycm.OnBufferUnload( deleted_buffer_file )

  assert_that(
    # Positional arguments passed to PostDataToHandlerAsync.
    post_data_to_handler_async.call_args[ 0 ],
    contains(
      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'
    )
  )