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import os
import re

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

FILES_PATTERN = re.compile(r"//\s+Files:(.*)")
SELF_SCRIPT_PATTERN = re.compile(r"//\s+Env: TEST_FILE_NAME")


# TODO (machenbach): Share commonalities with mjstest.
class TestSuite(testsuite.TestSuite):
  def ListTests(self, context):
    tests = []
    for dirname, dirs, files in os.walk(self.root):
      for dotted in [x for x in dirs if x.startswith('.')]:
        dirs.remove(dotted)
      if 'resources' in dirs:
        dirs.remove('resources')

      dirs.sort()
      files.sort()
      for filename in files:
        if filename.endswith(".js"):
          fullpath = os.path.join(dirname, filename)
          relpath = fullpath[len(self.root) + 1 : -3]
          testname = relpath.replace(os.path.sep, "/")
          test = self._create_test(testname)
          tests.append(test)
    return tests

  def _test_class(self):
    return TestCase


class TestCase(testcase.TestCase):
  def __init__(self, *args, **kwargs):
    super(TestCase, self).__init__(*args, **kwargs)

    source = self.get_source()
    self._source_files = self._parse_source_files(source)
    self._source_flags = self._parse_source_flags(source)

  def _parse_source_files(self, source):
    files_list = []  # List of file names to append to command arguments.
    files_match = FILES_PATTERN.search(source);
    # Accept several lines of 'Files:'.
    while True:
      if files_match:
        files_list += files_match.group(1).strip().split()
        files_match = FILES_PATTERN.search(source, files_match.end())
      else:
        break
    files = [ os.path.normpath(os.path.join(self.suite.root, '..', '..', f))
              for f in files_list ]
    testfilename = os.path.join(self.suite.root, self.path + self._get_suffix())
    if SELF_SCRIPT_PATTERN.search(source):
      env = ["-e", "TEST_FILE_NAME=\"%s\"" % testfilename.replace("\\", "\\\\")]
      files = env + files
    files.append(os.path.join(self.suite.root, "resources/standalone-pre.js"))
    files.append(testfilename)
    files.append(os.path.join(self.suite.root, "resources/standalone-post.js"))
    return files

  def _get_files_params(self, ctx):
    files = self._source_files
    if ctx.isolates:
      files = files + ['--isolate'] + files
    return files

  def _get_source_flags(self):
    return self._source_flags

  def _get_source_path(self):
    return os.path.join(self.suite.root, self.path + self._get_suffix())

  @property
  def output_proc(self):
    return webkit.OutProc(
        self.expected_outcomes,
        os.path.join(self.suite.root, self.path) + '-expected.txt')


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