import os
import shutil
import stat
import sys
import unittest

from django.core.management import call_command, CommandError, execute_from_command_line
from django.core.management.utils import find_command
from django.test import SimpleTestCase
from django.test import override_settings
from django.utils import translation
from django.utils._os import upath
from django.utils.six import StringIO

has_msgfmt = find_command('msgfmt')


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

    test_dir = os.path.abspath(os.path.join(os.path.dirname(upath(__file__)), 'commands'))

    def setUp(self):
        self._cwd = os.getcwd()
        self.addCleanup(os.chdir, self._cwd)
        os.chdir(self.test_dir)

    def _rmrf(self, dname):
        if os.path.commonprefix([self.test_dir, os.path.abspath(dname)]) != self.test_dir:
            return
        shutil.rmtree(dname)

    def rmfile(self, filepath):
        if os.path.exists(filepath):
            os.remove(filepath)


class PoFileTests(MessageCompilationTests):

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

    def test_bom_rejection(self):
        with self.assertRaises(CommandError) as cm:
            call_command('compilemessages', locale=[self.LOCALE], stdout=StringIO())
        self.assertIn("file has a BOM (Byte Order Mark)", cm.exception.args[0])
        self.assertFalse(os.path.exists(self.MO_FILE))

    def test_no_write_access(self):
        mo_file_en = 'locale/en/LC_MESSAGES/django.mo'
        err_buffer = StringIO()
        # put file in read-only mode
        old_mode = os.stat(mo_file_en).st_mode
        os.chmod(mo_file_en, stat.S_IREAD)
        try:
            call_command('compilemessages', locale=['en'], stderr=err_buffer, verbosity=0)
            err = err_buffer.getvalue()
            self.assertIn("not writable location", err)
        finally:
            os.chmod(mo_file_en, old_mode)


class PoFileContentsTests(MessageCompilationTests):
    # Ticket #11240

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

    def setUp(self):
        super(PoFileContentsTests, self).setUp()
        self.addCleanup(os.unlink, os.path.join(self.test_dir, self.MO_FILE))

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


class PercentRenderingTests(MessageCompilationTests):
    # Ticket #11240 -- Testing rendering doesn't belong here but we are trying
    # to keep tests for all the stack together

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

    def setUp(self):
        super(PercentRenderingTests, self).setUp()
        self.addCleanup(os.unlink, os.path.join(self.test_dir, self.MO_FILE))

    def test_percent_symbol_escaping(self):
        with override_settings(LOCALE_PATHS=(os.path.join(self.test_dir, 'locale'),)):
            from django.template import Template, Context
            call_command('compilemessages', locale=[self.LOCALE], stdout=StringIO())
            with translation.override(self.LOCALE):
                t = Template('{% load i18n %}{% trans "Looks like a str fmt spec %% o but shouldn\'t be interpreted as such" %}')
                rendered = t.render(Context({}))
                self.assertEqual(rendered, 'IT translation contains %% for the above string')

                t = Template('{% load i18n %}{% trans "Completed 50%% of all the tasks" %}')
                rendered = t.render(Context({}))
                self.assertEqual(rendered, 'IT translation of Completed 50%% of all the tasks')


class MultipleLocaleCompilationTests(MessageCompilationTests):

    MO_FILE_HR = None
    MO_FILE_FR = None

    def setUp(self):
        super(MultipleLocaleCompilationTests, self).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')
        self.addCleanup(self.rmfile, os.path.join(localedir, self.MO_FILE_HR))
        self.addCleanup(self.rmfile, os.path.join(localedir, self.MO_FILE_FR))

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

            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'], stdout=StringIO())

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


class ExcludedLocaleCompilationTests(MessageCompilationTests):

    test_dir = os.path.abspath(os.path.join(os.path.dirname(upath(__file__)), 'exclude'))

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

    def setUp(self):
        super(ExcludedLocaleCompilationTests, self).setUp()

        shutil.copytree('canned_locale', 'locale')
        self.addCleanup(self._rmrf, os.path.join(self.test_dir, 'locale'))

    def test_command_help(self):
        old_stdout, old_stderr = sys.stdout, sys.stderr
        sys.stdout, sys.stderr = StringIO(), StringIO()
        try:
            # `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'])
        finally:
            sys.stdout, sys.stderr = old_stdout, old_stderr

    def test_one_locale_excluded(self):
        call_command('compilemessages', exclude=['it'], stdout=StringIO())
        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'], stdout=StringIO())
        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'], stdout=StringIO())
        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'],
                     stdout=StringIO())
        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 CompilationErrorHandling(MessageCompilationTests):

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

    def setUp(self):
        super(CompilationErrorHandling, self).setUp()
        self.addCleanup(self.rmfile, os.path.join(self.test_dir, self.MO_FILE))

    def test_error_reported_by_msgfmt(self):
        with self.assertRaises(CommandError):
            call_command('compilemessages', locale=[self.LOCALE], stdout=StringIO())