# Copyright 2012 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# for py2/py3 compatibility
from __future__ import print_function

from os.path import exists
from os.path import isdir
from os.path import join
import os
import platform
import re
import subprocess
import urllib2


### Exit codes and their meaning.
# Normal execution.
EXIT_CODE_PASS = 0
# Execution with test failures.
EXIT_CODE_FAILURES = 1
# Execution with no tests executed.
EXIT_CODE_NO_TESTS = 2
# Execution aborted with SIGINT (Ctrl-C).
EXIT_CODE_INTERRUPTED = 3
# Execution aborted with SIGTERM.
EXIT_CODE_TERMINATED = 4
# Internal error.
EXIT_CODE_INTERNAL_ERROR = 5


def GetSuitePaths(test_root):
  return [ f for f in os.listdir(test_root) if isdir(join(test_root, f)) ]


# Reads a file into an array of strings
def ReadLinesFrom(name):
  lines = []
  with open(name) as f:
    for line in f:
      if line.startswith('#'): continue
      if '#' in line:
        line = line[:line.find('#')]
      line = line.strip()
      if not line: continue
      lines.append(line)
  return lines


def GuessOS():
  system = platform.system()
  if system == 'Linux':
    return 'linux'
  elif system == 'Darwin':
    return 'macos'
  elif system.find('CYGWIN') >= 0:
    return 'cygwin'
  elif system == 'Windows' or system == 'Microsoft':
    # On Windows Vista platform.system() can return 'Microsoft' with some
    # versions of Python, see http://bugs.python.org/issue1082
    return 'windows'
  elif system == 'FreeBSD':
    return 'freebsd'
  elif system == 'OpenBSD':
    return 'openbsd'
  elif system == 'SunOS':
    return 'solaris'
  elif system == 'NetBSD':
    return 'netbsd'
  elif system == 'AIX':
    return 'aix'
  else:
    return None


def UseSimulator(arch):
  machine = platform.machine()
  return (machine and
      (arch == "mipsel" or arch == "arm" or arch == "arm64") and
      not arch.startswith(machine))


# This will default to building the 32 bit VM even on machines that are
# capable of running the 64 bit VM.
def DefaultArch():
  machine = platform.machine()
  machine = machine.lower()  # Windows 7 capitalizes 'AMD64'.
  if machine.startswith('arm'):
    return 'arm'
  elif (not machine) or (not re.match('(x|i[3-6])86$', machine) is None):
    return 'ia32'
  elif machine == 'i86pc':
    return 'ia32'
  elif machine == 'x86_64':
    return 'ia32'
  elif machine == 'amd64':
    return 'ia32'
  elif machine == 's390x':
    return 's390'
  elif machine == 'ppc64':
    return 'ppc'
  else:
    return None


def GuessWordsize():
  if '64' in platform.machine():
    return '64'
  else:
    return '32'


def IsWindows():
  return GuessOS() == 'windows'


def URLRetrieve(source, destination):
  """urllib is broken for SSL connections via a proxy therefore we
  can't use urllib.urlretrieve()."""
  if IsWindows():
    try:
      # In python 2.7.6 on windows, urlopen has a problem with redirects.
      # Try using curl instead. Note, this is fixed in 2.7.8.
      subprocess.check_call(["curl", source, '-k', '-L', '-o', destination])
      return
    except:
      # If there's no curl, fall back to urlopen.
      print("Curl is currently not installed. Falling back to python.")
      pass
  with open(destination, 'w') as f:
    f.write(urllib2.urlopen(source).read())


class FrozenDict(dict):
  def __setitem__(self, *args, **kwargs):
    raise Exception('Tried to mutate a frozen dict')

  def update(self, *args, **kwargs):
    raise Exception('Tried to mutate a frozen dict')


def Freeze(obj):
  if isinstance(obj, dict):
    return FrozenDict((k, Freeze(v)) for k, v in obj.iteritems())
  elif isinstance(obj, set):
    return frozenset(obj)
  elif isinstance(obj, list):
    return tuple(Freeze(item) for item in obj)
  else:
    # Make sure object is hashable.
    hash(obj)
    return obj
