import gettext as gettext_module
import os
import stat
import unittest
from io import StringIO
from pathlib import Path
from subprocess import run
from unittest import mock

from django.core.management import (
    CommandError, call_command, execute_from_command_line,
)
from django.core.management.commands.makemessages import (
    Command as MakeMessagesCommand,
)
from django.core.management.utils import find_command
from django.test import SimpleTestCase, override_settings
from django.test.utils import captured_stderr, captured_stdout
from django.utils import translation
from django.utils.translation import gettext

from .utils import RunInTmpDirMixin, copytree

has_msgfmt = find_command('msgfmt')


@unittest.skipUnless(has_msgfmt, 'msgfmt is mandatory for compilation tests')
class MessageCompilationTests(RunInTmpDirMixin, SimpleTestCase):

    work_subdir = 'commands'


class PoFileTests(MessageCompilationTests):

    LOCALE = 'es_AR'
    MO_FILE = 'locale/%s/LC_MESSAGES/django.mo' % LOCALE
    MO_FILE_EN = 'locale/en/LC_MESSAGES/django.mo'

    def test_bom_rejection(self):
        stderr = StringIO()
        with self.assertRaisesMessage(CommandError, 'compilemessages generated one or more errors.'):
            call_command('compilemessages', locale=[self.LOCALE], verbosity=0, stderr=stderr)
        self.assertIn('file has a BOM (Byte Order Mark)', stderr.getvalue())
        self.assertFalse(os.path.exists(self.MO_FILE))

    def test_no_write_access(self):
        mo_file_en = Path(self.MO_FILE_EN)
        err_buffer = StringIO()
        # Put file in read-only mode.
        old_mode = mo_file_en.stat().st_mode
        mo_file_en.chmod(stat.S_IREAD)
        # Ensure .po file is more recent than .mo file.
        mo_file_en.with_suffix('.po').touch()
        try:
            with self.assertRaisesMessage(CommandError, 'compilemessages generated one or more errors.'):
                call_command('compilemessages', locale=['en'], stderr=err_buffer, verbosity=0)
            self.assertIn('not writable location', err_buffer.getvalue())
        finally:
            mo_file_en.chmod(old_mode)

    def test_no_compile_when_unneeded(self):
        mo_file_en = Path(self.MO_FILE_EN)
        mo_file_en.touch()
        stdout = StringIO()
        call_command('compilemessages', locale=['en'], stdout=stdout, verbosity=1)
        msg = '%s” is already compiled and up to date.' % mo_file_en.with_suffix('.po')
        self.assertIn(msg, stdout.getvalue())


class PoFileContentsTests(MessageCompilationTests):
    # Ticket #11240

    LOCALE = 'fr'
    MO_FILE = 'locale/%s/LC_MESSAGES/django.mo' % LOCALE

    def test_percent_symbol_in_po_file(self):
        call_command('compilemessages', locale=[self.LOCALE], verbosity=0)
        self.assertTrue(os.path.exists(self.MO_FILE))


class MultipleLocaleCompilationTests(MessageCompilationTests):

    MO_FILE_HR = None
    MO_FILE_FR = None

    def setUp(self):
        super().setUp()
        localedir = os.path.join(self.test_dir, 'locale')
        self.MO_FILE_HR = os.path.join(localedir, 'hr/LC_MESSAGES/django.mo')
        self.MO_FILE_FR = os.path.join(localedir, 'fr/LC_MESSAGES/django.mo')

    def test_one_locale(self):
        with override_settings(LOCALE_PATHS=[os.path.join(self.test_dir, 'locale')]):
            call_command('compilemessages', locale=['hr'], verbosity=0)

            self.assertTrue(os.path.exists(self.MO_FILE_HR))

    def test_multiple_locales(self):
        with override_settings(LOCALE_PATHS=[os.path.join(self.test_dir, 'locale')]):
            call_command('compilemessages', locale=['hr', 'fr'], verbosity=0)

            self.assertTrue(os.path.exists(self.MO_FILE_HR))
            self.assertTrue(os.path.exists(self.MO_FILE_FR))


class ExcludedLocaleCompilationTests(MessageCompilationTests):

    work_subdir = 'exclude'

    MO_FILE = 'locale/%s/LC_MESSAGES/django.mo'

    def setUp(self):
        super().setUp()
        copytree('canned_locale', 'locale')

    def test_command_help(self):
        with captured_stdout(), captured_stderr():
            # `call_command` bypasses the parser; by calling
            # `execute_from_command_line` with the help subcommand we
            # ensure that there are no issues with the parser itself.
            execute_from_command_line(['django-admin', 'help', 'compilemessages'])

    def test_one_locale_excluded(self):
        call_command('compilemessages', exclude=['it'], verbosity=0)
        self.assertTrue(os.path.exists(self.MO_FILE % 'en'))
        self.assertTrue(os.path.exists(self.MO_FILE % 'fr'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'it'))

    def test_multiple_locales_excluded(self):
        call_command('compilemessages', exclude=['it', 'fr'], verbosity=0)
        self.assertTrue(os.path.exists(self.MO_FILE % 'en'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'fr'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'it'))

    def test_one_locale_excluded_with_locale(self):
        call_command('compilemessages', locale=['en', 'fr'], exclude=['fr'], verbosity=0)
        self.assertTrue(os.path.exists(self.MO_FILE % 'en'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'fr'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'it'))

    def test_multiple_locales_excluded_with_locale(self):
        call_command('compilemessages', locale=['en', 'fr', 'it'], exclude=['fr', 'it'], verbosity=0)
        self.assertTrue(os.path.exists(self.MO_FILE % 'en'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'fr'))
        self.assertFalse(os.path.exists(self.MO_FILE % 'it'))


class IgnoreDirectoryCompilationTests(MessageCompilationTests):
    # Reuse the exclude directory since it contains some locale fixtures.
    work_subdir = 'exclude'
    MO_FILE = '%s/%s/LC_MESSAGES/django.mo'
    CACHE_DIR = Path('cache') / 'locale'
    NESTED_DIR = Path('outdated') / 'v1' / 'locale'

    def setUp(self):
        super().setUp()
        copytree('canned_locale', 'locale')
        copytree('canned_locale', self.CACHE_DIR)
        copytree('canned_locale', self.NESTED_DIR)

    def assertAllExist(self, dir, langs):
        self.assertTrue(all(Path(self.MO_FILE % (dir, lang)).exists() for lang in langs))

    def assertNoneExist(self, dir, langs):
        self.assertTrue(all(Path(self.MO_FILE % (dir, lang)).exists() is False for lang in langs))

    def test_one_locale_dir_ignored(self):
        call_command('compilemessages', ignore=['cache'], verbosity=0)
        self.assertAllExist('locale', ['en', 'fr', 'it'])
        self.assertNoneExist(self.CACHE_DIR, ['en', 'fr', 'it'])
        self.assertAllExist(self.NESTED_DIR, ['en', 'fr', 'it'])

    def test_multiple_locale_dirs_ignored(self):
        call_command('compilemessages', ignore=['cache/locale', 'outdated'], verbosity=0)
        self.assertAllExist('locale', ['en', 'fr', 'it'])
        self.assertNoneExist(self.CACHE_DIR, ['en', 'fr', 'it'])
        self.assertNoneExist(self.NESTED_DIR, ['en', 'fr', 'it'])

    def test_ignores_based_on_pattern(self):
        call_command('compilemessages', ignore=['*/locale'], verbosity=0)
        self.assertAllExist('locale', ['en', 'fr', 'it'])
        self.assertNoneExist(self.CACHE_DIR, ['en', 'fr', 'it'])
        self.assertNoneExist(self.NESTED_DIR, ['en', 'fr', 'it'])


class CompilationErrorHandling(MessageCompilationTests):
    def test_error_reported_by_msgfmt(self):
        # po file contains wrong po formatting.
        with self.assertRaises(CommandError):
            call_command('compilemessages', locale=['ja'], verbosity=0)

    def test_msgfmt_error_including_non_ascii(self):
        # po file contains invalid msgstr content (triggers non-ascii error content).
        # Make sure the output of msgfmt is unaffected by the current locale.
        env = os.environ.copy()
        env.update({'LANG': 'C'})
        with mock.patch('django.core.management.utils.run', lambda *args, **kwargs: run(*args, env=env, **kwargs)):
            cmd = MakeMessagesCommand()
            if cmd.gettext_version < (0, 18, 3):
                self.skipTest("python-brace-format is a recent gettext addition.")
            stderr = StringIO()
            with self.assertRaisesMessage(CommandError, 'compilemessages generated one or more errors'):
                call_command('compilemessages', locale=['ko'], stdout=StringIO(), stderr=stderr)
            self.assertIn("' cannot start a field name", stderr.getvalue())


class ProjectAndAppTests(MessageCompilationTests):
    LOCALE = 'ru'
    PROJECT_MO_FILE = 'locale/%s/LC_MESSAGES/django.mo' % LOCALE
    APP_MO_FILE = 'app_with_locale/locale/%s/LC_MESSAGES/django.mo' % LOCALE


class FuzzyTranslationTest(ProjectAndAppTests):

    def setUp(self):
        super().setUp()
        gettext_module._translations = {}  # flush cache or test will be useless

    def test_nofuzzy_compiling(self):
        with override_settings(LOCALE_PATHS=[os.path.join(self.test_dir, 'locale')]):
            call_command('compilemessages', locale=[self.LOCALE], verbosity=0)
            with translation.override(self.LOCALE):
                self.assertEqual(gettext('Lenin'), 'Ленин')
                self.assertEqual(gettext('Vodka'), 'Vodka')

    def test_fuzzy_compiling(self):
        with override_settings(LOCALE_PATHS=[os.path.join(self.test_dir, 'locale')]):
            call_command('compilemessages', locale=[self.LOCALE], fuzzy=True, verbosity=0)
            with translation.override(self.LOCALE):
                self.assertEqual(gettext('Lenin'), 'Ленин')
                self.assertEqual(gettext('Vodka'), 'Водка')


class AppCompilationTest(ProjectAndAppTests):

    def test_app_locale_compiled(self):
        call_command('compilemessages', locale=[self.LOCALE], verbosity=0)
        self.assertTrue(os.path.exists(self.PROJECT_MO_FILE))
        self.assertTrue(os.path.exists(self.APP_MO_FILE))


class PathLibLocaleCompilationTests(MessageCompilationTests):
    work_subdir = 'exclude'

    def test_locale_paths_pathlib(self):
        with override_settings(LOCALE_PATHS=[Path(self.test_dir) / 'canned_locale']):
            call_command('compilemessages', locale=['fr'], verbosity=0)
            self.assertTrue(os.path.exists('canned_locale/fr/LC_MESSAGES/django.mo'))