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import hashlib
import os
import shutil
import sys
import tarfile

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


TEST_262_ARCHIVE_REVISION = "fbba29f"  # This is the r365 revision.
TEST_262_ARCHIVE_MD5 = "e1ff0db438cc12de8fb6da80621b4ef6"
TEST_262_URL = "https://github.com/tc39/test262/tarball/%s"
TEST_262_HARNESS = ["sta.js", "testBuiltInObject.js", "testIntl.js"]


class Test262TestSuite(testsuite.TestSuite):

  def __init__(self, name, root):
    super(Test262TestSuite, self).__init__(name, root)
    self.testroot = os.path.join(root, "data", "test", "suite")
    self.harness = [os.path.join(self.root, "data", "test", "harness", f)
                    for f in TEST_262_HARNESS]
    self.harness += [os.path.join(self.root, "harness-adapt.js")]

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

  def ListTests(self, context):
    tests = []
    for dirname, dirs, files in os.walk(self.testroot):
      for dotted in [x for x in dirs if x.startswith(".")]:
        dirs.remove(dotted)
      if context.noi18n and "intl402" in dirs:
        dirs.remove("intl402")
      dirs.sort()
      files.sort()
      for filename in files:
        if filename.endswith(".js"):
          testname = os.path.join(dirname[len(self.testroot) + 1:],
                                  filename[:-3])
          case = testcase.TestCase(self, testname)
          tests.append(case)
    return tests

  def GetFlagsForTestCase(self, testcase, context):
    return (testcase.flags + context.mode_flags + self.harness +
            [os.path.join(self.testroot, testcase.path + ".js")])

  def GetSourceForTest(self, testcase):
    filename = os.path.join(self.testroot, testcase.path + ".js")
    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 "FAILED!" in output.stdout

  def DownloadData(self):
    revision = TEST_262_ARCHIVE_REVISION
    archive_url = TEST_262_URL % revision
    archive_name = os.path.join(self.root, "tc39-test262-%s.tar.gz" % revision)
    directory_name = os.path.join(self.root, "data")
    directory_old_name = os.path.join(self.root, "data.old")

    # Clobber if the test is in an outdated state, i.e. if there are any other
    # archive files present.
    archive_files = [f for f in os.listdir(self.root)
                     if f.startswith("tc39-test262-")]
    if (len(archive_files) > 1 or
        os.path.basename(archive_name) not in archive_files):
      print "Clobber outdated test archives ..."
      for f in archive_files:
        os.remove(os.path.join(self.root, f))

    if not os.path.exists(archive_name):
      print "Downloading test data from %s ..." % archive_url
      utils.URLRetrieve(archive_url, archive_name)
      if os.path.exists(directory_name):
        if os.path.exists(directory_old_name):
          shutil.rmtree(directory_old_name)
        os.rename(directory_name, directory_old_name)
    if not os.path.exists(directory_name):
      print "Extracting test262-%s.tar.gz ..." % revision
      md5 = hashlib.md5()
      with open(archive_name, "rb") as f:
        for chunk in iter(lambda: f.read(8192), ""):
          md5.update(chunk)
      print "MD5 hash is %s" % md5.hexdigest()
      if md5.hexdigest() != TEST_262_ARCHIVE_MD5:
        os.remove(archive_name)
        print "MD5 expected %s" % TEST_262_ARCHIVE_MD5
        raise Exception("Hash mismatch of test data file")
      archive = tarfile.open(archive_name, "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)
      os.rename(os.path.join(self.root, "tc39-test262-%s" % revision),
                directory_name)


def GetSuite(name, root):
  return Test262TestSuite(name, root)