# Copyright (C) 2013  Google Inc.
#
# 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 ycmd.utils import ToUnicode
from ycm.client.base_request import ( BaseRequest, JsonFromFuture,
                                      HandleServerException,
                                      MakeServerException )


class CompletionRequest( BaseRequest ):
  def __init__( self, request_data ):
    super( CompletionRequest, self ).__init__()
    self.request_data = request_data
    self._response_future = None
    self._response = { 'completions': [], 'completion_start_column': -1 }


  def Start( self ):
    self._response_future = self.PostDataToHandlerAsync( self.request_data,
                                                         'completions' )


  def Done( self ):
    return bool( self._response_future ) and self._response_future.done()


  def RawResponse( self ):
    if not self._response_future:
      return self._response

    with HandleServerException( truncate = True ):
      self._response = JsonFromFuture( self._response_future )

      # Vim may not be able to convert the 'errors' entry to its internal format
      # so we remove it from the response.
      errors = self._response.pop( 'errors', [] )
      for e in errors:
        with HandleServerException( truncate = True ):
          raise MakeServerException( e )

    return self._response


  def Response( self ):
    response = self.RawResponse()
    response[ 'completions' ] = _ConvertCompletionDatasToVimDatas(
        response[ 'completions' ] )
    return response


def ConvertCompletionDataToVimData( completion_identifier, completion_data ):
  # see :h complete-items for a description of the dictionary fields
  vim_data = {
    'word'  : '',
    'dup'   : 1,
    'empty' : 1,
  }

  if ( 'extra_data' in completion_data and
       'doc_string' in completion_data[ 'extra_data' ] ):
    doc_string = completion_data[ 'extra_data' ][ 'doc_string' ]
  else:
    doc_string = ""

  if 'insertion_text' in completion_data:
    vim_data[ 'word' ] = completion_data[ 'insertion_text' ]
  if 'menu_text' in completion_data:
    vim_data[ 'abbr' ] = completion_data[ 'menu_text' ]
  if 'extra_menu_info' in completion_data:
    vim_data[ 'menu' ] = completion_data[ 'extra_menu_info' ]
  if 'kind' in completion_data:
    kind = ToUnicode( completion_data[ 'kind' ] )
    if kind:
      vim_data[ 'kind' ] = kind[ 0 ].lower()
  if 'detailed_info' in completion_data:
    vim_data[ 'info' ] = completion_data[ 'detailed_info' ]
    if doc_string:
      vim_data[ 'info' ] += '\n' + doc_string
  elif doc_string:
    vim_data[ 'info' ] = doc_string

  # We store the completion item index as a string in the completion user_data.
  # This allows us to identify the _exact_ item that was completed in the
  # CompleteDone handler, by inspecting this item from v:completed_item
  #
  # We convert to string because completion user data items must be strings.
  #
  # Note: Not all versions of Vim support this (added in 8.0.1483), but adding
  # the item to the dictionary is harmless in earlier Vims.
  vim_data[ 'user_data' ] = str( completion_identifier )

  return vim_data


def _ConvertCompletionDatasToVimDatas( response_data ):
  return [ ConvertCompletionDataToVimData( i, x )
           for i, x in enumerate( response_data ) ]