#!/usr/bin/env python

import atexit
import contextlib
import errno
import shutil
import subprocess
import sys
import tarfile
import tempfile
import urllib2
import os
import zipfile


def tempdir(prefix=''):
  directory = tempfile.mkdtemp(prefix=prefix)
  atexit.register(shutil.rmtree, directory)
  return directory


@contextlib.contextmanager
def scoped_cwd(path):
  cwd = os.getcwd()
  os.chdir(path)
  try:
    yield
  finally:
    os.chdir(cwd)


def download(text, url, path):
  with open(path, 'w') as local_file:
    web_file = urllib2.urlopen(url)
    file_size = int(web_file.info().getheaders("Content-Length")[0])
    downloaded_size = 0
    block_size = 128

    while True:
      buf = web_file.read(block_size)
      if not buf:
        break

      downloaded_size += len(buf)
      local_file.write(buf)

      percent = downloaded_size * 100. / file_size
      status = "\r%s  %10d  [%3.1f%%]" % (text, downloaded_size, percent)
      print status,

    print


def extract_tarball(tarball_path, member, destination):
  with tarfile.open(tarball_path) as tarball:
    tarball.extract(member, destination)


def extract_zip(zip_path, destination):
  if sys.platform == 'darwin':
    # Use unzip command on Mac to keep symbol links in zip file work.
    subprocess.check_call(['unzip', zip_path, '-d', destination])
  else:
    with zipfile.ZipFile(zip_path) as z:
      z.extractall(destination)


def rm_rf(path):
  try:
    shutil.rmtree(path)
  except OSError as e:
    if e.errno != errno.ENOENT:
      raise


def safe_unlink(path):
  try:
    os.unlink(path)
  except OSError as e:
    if e.errno != errno.ENOENT:
      raise


def safe_mkdir(path):
  try:
    os.makedirs(path)
  except OSError as e:
    if e.errno != errno.EEXIST:
      raise


def get_node_path():
  node = os.path.join(os.path.dirname(__file__), '..', '..', 'node', 'node')
  if sys.platform == 'win32' or sys.platform == 'cygwin':
    node += '.exe'
  return node