#!@PYTHON@
#    This file is part of GNUnet.
#    (C) 2010 Christian Grothoff (and other contributing authors)
#
#    GNUnet is free software: you can redistribute it and/or modify it
#    under the terms of the GNU Affero General Public License as published
#    by the Free Software Foundation, either version 3 of the License,
#    or (at your option) any later version.
#
#    GNUnet 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
#    Affero General Public License for more details.
#   
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#    SPDX-License-Identifier: AGPL3.0-or-later
#
# Testcase for gnunet-peerinfo

import os
import re
import subprocess
import sys
import shutil
import time

class pexpect (object):
  def __init__ (self):
    super (pexpect, self).__init__ ()

  def spawn (self, stdin, arglist, *pargs, **kwargs):
    env = kwargs.pop ('env', None)
    if env is None:
      env = os.environ.copy ()
    # This messes up some testcases, disable log redirection
    env.pop ('GNUNET_FORCE_LOGFILE', None)
    self.proc = subprocess.Popen (arglist, *pargs, env=env, **kwargs)
    if self.proc is None:
      print ("Failed to spawn a process {0}".format (arglist))
      sys.exit (1)
    if stdin is not None:
      self.stdo, self.stde = self.proc.communicate (stdin)
    else:
      self.stdo, self.stde = self.proc.communicate ()
    return self.proc

  def expect (self, s, r, flags=0):
    stream = self.stdo if s == 'stdout' else self.stde
    if isinstance (r, str):
      if r == "EOF":
        if len (stream) == 0:
          return True
        else:
          print ("Failed to find `{1}' in {0}, which is `{2}' ({3})".format (s, r, stream, len (stream)))
          sys.exit (2)
      raise ValueError ("Argument `r' should be an instance of re.RegexObject or a special string, but is `{0}'".format (r))
    m = r.search (stream, flags)
    if not m:
      print ("Failed to find `{1}' in {0}, which is is `{2}'".format (s, r.pattern, stream))
      sys.exit (2)
    stream = stream[m.end ():]
    if s == 'stdout':
      self.stdo = stream
    else:
      self.stde = stream
    return m

  def read (self, s, size=-1):
    stream = self.stdo if s == 'stdout' else self.stde
    result = ""
    if size < 0:
      result = stream
      new_stream = ""
    else:
      result = stream[0:size]
      new_stream = stream[size:]
    if s == 'stdout':
      self.stdo = new_stream
    else:
      self.stde = new_stream
    return result
