#!/usr/bin/env python3
import json
import os
import re
import shutil
import unittest
import xml.etree.ElementTree as ET

from selfdrive.ui.update_translations import TRANSLATIONS_DIR, LANGUAGES_FILE, update_translations

TMP_TRANSLATIONS_DIR = os.path.join(TRANSLATIONS_DIR, "tmp")


class TestTranslations(unittest.TestCase):
  @classmethod
  def setUpClass(cls):
    with open(LANGUAGES_FILE, "r") as f:
      cls.translation_files = json.load(f)

    # Set up temp directory
    shutil.copytree(TRANSLATIONS_DIR, TMP_TRANSLATIONS_DIR, dirs_exist_ok=True)

  @classmethod
  def tearDownClass(cls):
    shutil.rmtree(TMP_TRANSLATIONS_DIR, ignore_errors=True)

  @staticmethod
  def _read_translation_file(path, file):
    tr_file = os.path.join(path, f"{file}.ts")
    with open(tr_file, "rb") as f:
      # fix relative path depth
      return f.read().replace(b"filename=\"../../", b"filename=\"../")

  def test_missing_translation_files(self):
    for name, file in self.translation_files.items():
      with self.subTest(name=name, file=file):
        self.assertTrue(os.path.exists(os.path.join(TRANSLATIONS_DIR, f"{file}.ts")),
                        f"{name} has no XML translation file, run selfdrive/ui/update_translations.py")

  def test_translations_updated(self):
    update_translations(plural_only=["main_en"], translations_dir=TMP_TRANSLATIONS_DIR)

    for name, file in self.translation_files.items():
      with self.subTest(name=name, file=file):
        # caught by test_missing_translation_files
        if not os.path.exists(os.path.join(TRANSLATIONS_DIR, f"{file}.ts")):
          self.skipTest(f"{name} missing translation file")

        cur_translations = self._read_translation_file(TRANSLATIONS_DIR, file)
        new_translations = self._read_translation_file(TMP_TRANSLATIONS_DIR, file)
        self.assertEqual(cur_translations, new_translations,
                         f"{file} ({name}) XML translation file out of date. Run selfdrive/ui/update_translations.py to update the translation files")

  @unittest.skip("Only test unfinished translations before going to release")
  def test_unfinished_translations(self):
    for name, file in self.translation_files.items():
      with self.subTest(name=name, file=file):
        cur_translations = self._read_translation_file(TRANSLATIONS_DIR, file)
        self.assertTrue(b"<translation type=\"unfinished\">" not in cur_translations,
                        f"{file} ({name}) translation file has unfinished translations. Finish translations or mark them as completed in Qt Linguist")

  def test_vanished_translations(self):
    for name, file in self.translation_files.items():
      with self.subTest(name=name, file=file):
        cur_translations = self._read_translation_file(TRANSLATIONS_DIR, file)
        self.assertTrue(b"<translation type=\"vanished\">" not in cur_translations,
                        f"{file} ({name}) translation file has obsolete translations. Run selfdrive/ui/update_translations.py --vanish to remove them")

  def test_plural_translations(self):
    """
      Tests:
      - that any numerus (plural) translations marked "finished" have all plural forms non-empty
      - that the correct format specifier is used (%n)
    """
    for name, file in self.translation_files.items():
      with self.subTest(name=name, file=file):
        tr_xml = ET.parse(os.path.join(TRANSLATIONS_DIR, f"{file}.ts"))

        for context in tr_xml.getroot():
          for message in context.iterfind("message"):
            if message.get("numerus") == "yes":
              translation = message.find("translation")
              numerusform = [t.text for t in translation.findall("numerusform")]

              # Do not assert finished translations
              if translation.get("type") == "unfinished":
                continue

              self.assertNotIn(None, numerusform, "Ensure all plural translation forms are completed.")
              self.assertTrue(all([re.search("%[0-9]+", t) is None for t in numerusform]),
                              "Plural translations must use %n, not %1, %2, etc.: {}".format(numerusform))


if __name__ == "__main__":
  unittest.main()