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import hashlib
import os
import shutil
import sys
import tarfile
import urllib

from testrunner.local import testsuite
from testrunner.objects import testcase


SINON_TAG = '1.7.3'
SINON_NAME = 'sinon'
SINON_FILENAME = 'sinon.js'
SINON_URL = 'http://sinonjs.org/releases/sinon-' + SINON_TAG + '.js'
SINON_HASH = 'b7ab4dd9a1a2cf0460784af3728ad15caf4bbea923f680c5abde5c8332f35984'

TEST_TAG = '2.0.3'
TEST_ARCHIVE_TOP = 'promises-tests-' + TEST_TAG
TEST_NAME = 'promises-tests'
TEST_ARCHIVE = TEST_NAME + '.tar.gz'
TEST_URL = 'https://github.com/promises-aplus/promises-tests/archive/' + \
    TEST_TAG + '.tar.gz'
TEST_ARCHIVE_HASH = \
    'e446ca557ac5836dd439fecd19689c243a28b1d5a6644dd7fed4274d0fa67270'


class PromiseAplusTestSuite(testsuite.TestSuite):

  def __init__(self, name, root):
    self.root = root
    self.test_files_root = os.path.join(self.root, TEST_NAME, 'lib', 'tests')
    self.name = name
    self.helper_files_pre = [
      os.path.join(root, 'lib', name) for name in
      ['global.js', 'require.js', 'mocha.js', 'adapter.js']
    ]
    self.helper_files_post = [
      os.path.join(root, 'lib', name) for name in
      ['run-tests.js']
    ]

  def CommonTestName(self, testcase):
    return testcase.path.split(os.path.sep)[-1]

  def ListTests(self, context):
    return [testcase.TestCase(self, fname[:-len('.js')]) for fname in
            os.listdir(os.path.join(self.root, TEST_NAME, 'lib', 'tests'))
            if fname.endswith('.js')]

  def GetFlagsForTestCase(self, testcase, context):
    return (testcase.flags + context.mode_flags + ['--harmony'] +
            self.helper_files_pre +
            [os.path.join(self.test_files_root, testcase.path + '.js')] +
            self.helper_files_post)

  def GetSourceForTest(self, testcase):
    filename = os.path.join(self.root, TEST_NAME,
                            'lib', 'tests', testcase.path + '.js')
    return 'print("FAIL: fail");'
    with open(filename) as f:
      return f.read()

  def IsNegativeTest(self, testcase):
    return '@negative' in self.GetSourceForTest(testcase)

  def IsFailureOutput(self, output, testpath):
    if output.exit_code != 0:
      return True
    return not 'All tests have run.' in output.stdout or \
           'FAIL:' in output.stdout

  def DownloadTestData(self):
    archive = os.path.join(self.root, TEST_ARCHIVE)
    directory = os.path.join(self.root, TEST_NAME)
    if not os.path.exists(archive):
      print('Downloading {0} from {1} ...'.format(TEST_NAME, TEST_URL))
      urllib.urlretrieve(TEST_URL, archive)
      if os.path.exists(directory):
        shutil.rmtree(directory)

    if not os.path.exists(directory):
      print('Extracting {0} ...'.format(TEST_ARCHIVE))
      hash = hashlib.sha256()
      with open(archive, 'rb') as f:
        for chunk in iter(lambda: f.read(8192), ''):
          hash.update(chunk)
        if hash.hexdigest() != TEST_ARCHIVE_HASH:
          os.remove(archive)
          raise Exception('Hash mismatch of test data file')
      archive = tarfile.open(archive, 'r:gz')
      if sys.platform in ('win32', 'cygwin'):
        # Magic incantation to allow longer path names on Windows.
        archive.extractall(u'\\\\?\\%s' % self.root)
      else:
        archive.extractall(self.root)
      shutil.move(os.path.join(self.root, TEST_ARCHIVE_TOP), directory)

  def DownloadSinon(self):
    directory = os.path.join(self.root, SINON_NAME)
    if not os.path.exists(directory):
      os.mkdir(directory)
    path = os.path.join(directory, SINON_FILENAME)
    if not os.path.exists(path):
      urllib.urlretrieve(SINON_URL, path)
    hash = hashlib.sha256()
    with open(path, 'rb') as f:
      for chunk in iter(lambda: f.read(8192), ''):
        hash.update(chunk)
    if hash.hexdigest() != SINON_HASH:
      os.remove(path)
      raise Exception('Hash mismatch of test data file')

  def DownloadData(self):
    self.DownloadTestData()
    self.DownloadSinon()


def GetSuite(name, root):
  return PromiseAplusTestSuite(name, root)
