# This file is NOT licensed under the GPLv3, which is the license for the rest
# of YouCompleteMe.
#
# Here's the license text for this file:
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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# For more information, please refer to <http://unlicense.org/>

import os
import subprocess

DIR_OF_THIS_SCRIPT = os.path.abspath( os.path.dirname( __file__ ) )
DIR_OF_THIRD_PARTY = os.path.join( DIR_OF_THIS_SCRIPT, 'third_party' )
DIR_OF_YCMD_THIRD_PARTY = os.path.join( DIR_OF_THIRD_PARTY,
                                        'ycmd', 'third_party' )


def GetStandardLibraryIndexInSysPath( sys_path ):
  for index, path in enumerate( sys_path ):
    if os.path.isfile( os.path.join( path, 'os.py' ) ):
      return index
  raise RuntimeError( 'Could not find standard library path in Python path.' )


def PythonSysPath( **kwargs ):
  sys_path = kwargs[ 'sys_path' ]

  dependencies = [ os.path.join( DIR_OF_THIS_SCRIPT, 'python' ),
                   os.path.join( DIR_OF_THIRD_PARTY, 'requests-futures' ),
                   os.path.join( DIR_OF_THIRD_PARTY, 'ycmd' ),
                   os.path.join( DIR_OF_YCMD_THIRD_PARTY, 'frozendict' ),
                   os.path.join( DIR_OF_YCMD_THIRD_PARTY, 'requests' ) ]

  # The concurrent.futures module is part of the standard library on Python 3.
  interpreter_path = kwargs[ 'interpreter_path' ]
  major_version = int( subprocess.check_output( [
    interpreter_path, '-c', 'import sys; print( sys.version_info[ 0 ] )' ]
  ).rstrip().decode( 'utf8' ) )
  if major_version == 2:
    dependencies.append( os.path.join( DIR_OF_THIRD_PARTY, 'pythonfutures' ) )

  sys_path[ 0:0 ] = dependencies
  sys_path.insert( GetStandardLibraryIndexInSysPath( sys_path ) + 1,
                   os.path.join( DIR_OF_YCMD_THIRD_PARTY, 'python-future',
                                 'src' ) )

  return sys_path