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import test
import os
import shutil
from shutil import rmtree
from os import mkdir
from glob import glob
from os.path import join, dirname, exists
import re


FLAGS_PATTERN = re.compile(r"//\s+Flags:(.*)")
FILES_PATTERN = re.compile(r"//\s+Files:(.*)")


class GCTestCase(test.TestCase):

  def __init__(self, path, file, mode, context, config):
    super(GCTestCase, self).__init__(context, path, mode)
    self.file = file
    self.config = config
    self.mode = mode
    self.tmpdir = join(dirname(self.config.root), 'tmp')
  
  def AfterRun(self, result):
    # delete the whole tmp dir
    try:
      rmtree(self.tmpdir)
    except:
      pass
    # make it again.
    try:
      mkdir(self.tmpdir)
    except:
      pass

  def BeforeRun(self):
    # delete the whole tmp dir
    try:
      rmtree(self.tmpdir)
    except:
      pass
    # make it again.
    # intermittently fails on win32, so keep trying
    while not os.path.exists(self.tmpdir):
      try:
        mkdir(self.tmpdir)
      except:
        pass
  
  def GetLabel(self):
    return "%s %s" % (self.mode, self.GetName())

  def GetName(self):
    return self.path[-1]

  def GetCommand(self):
    result = [self.config.context.GetVm(self.mode)]
    source = open(self.file).read()
    flags_match = FLAGS_PATTERN.search(source)
    if flags_match:
      result += flags_match.group(1).strip().split()
    files_match = FILES_PATTERN.search(source);
    additional_files = []
    if files_match:
      additional_files += files_match.group(1).strip().split()
    for a_file in additional_files:
      result.append(join(dirname(self.config.root), '..', a_file))
    result += ["--expose-gc"]
    result += [self.file]
    return result

  def GetSource(self):
    return open(self.file).read()


class GCTestConfiguration(test.TestConfiguration):

  def __init__(self, context, root):
    super(GCTestConfiguration, self).__init__(context, root)

  def Ls(self, path):
    def SelectTest(name):
      return name.startswith('test-') and name.endswith('.js')
    return [f[:-3] for f in os.listdir(path) if SelectTest(f)]

  def ListTests(self, current_path, path, mode):
    all_tests = [current_path + [t] for t in self.Ls(join(self.root))]
    result = []
    for test in all_tests:
      if self.Contains(path, test):
        file_path = join(self.root, reduce(join, test[1:], "") + ".js")
        result.append(GCTestCase(test, file_path, mode, self.context, self))
    return result

  def GetBuildRequirements(self):
    return ['sample', 'sample=shell']

  def GetTestStatus(self, sections, defs):
    status_file = join(self.root, 'gc.status')
    if exists(status_file):
      test.ReadConfigurationInto(status_file, sections, defs)


def GetConfiguration(context, root):
  return GCTestConfiguration(context, root)