import codecs
import datetime
import os
import shutil
import tempfile
import unittest
from io import StringIO
from unittest import mock

from admin_scripts.tests import AdminScriptTestCase

from django.conf import settings
from django.contrib.staticfiles import storage
from django.contrib.staticfiles.management.commands import (
    collectstatic, runserver,
)
from django.core.exceptions import ImproperlyConfigured
from django.core.management import CommandError, call_command
from django.test import RequestFactory, override_settings
from django.test.utils import extend_sys_path
from django.utils import timezone
from django.utils._os import symlinks_supported
from django.utils.functional import empty

from .cases import CollectionTestCase, StaticFilesTestCase, TestDefaults
from .settings import TEST_ROOT, TEST_SETTINGS
from .storage import DummyStorage


class TestNoFilesCreated:

    def test_no_files_created(self):
        """
        Make sure no files were create in the destination directory.
        """
        self.assertEqual(os.listdir(settings.STATIC_ROOT), [])


class TestRunserver(StaticFilesTestCase):
    @override_settings(MIDDLEWARE=['django.middleware.common.CommonMiddleware'])
    def test_middleware_loaded_only_once(self):
        command = runserver.Command()
        with mock.patch('django.middleware.common.CommonMiddleware') as mocked:
            command.get_handler(use_static_handler=True, insecure_serving=True)
            self.assertEqual(mocked.call_count, 1)

    def test_404_response(self):
        command = runserver.Command()
        handler = command.get_handler(use_static_handler=True, insecure_serving=True)
        missing_static_file = os.path.join(settings.STATIC_URL, 'unknown.css')
        req = RequestFactory().get(missing_static_file)
        with override_settings(DEBUG=False):
            response = handler.get_response(req)
            self.assertEqual(response.status_code, 404)
        with override_settings(DEBUG=True):
            response = handler.get_response(req)
            self.assertEqual(response.status_code, 404)


class TestFindStatic(TestDefaults, CollectionTestCase):
    """
    Test ``findstatic`` management command.
    """
    def _get_file(self, filepath):
        path = call_command('findstatic', filepath, all=False, verbosity=0, stdout=StringIO())
        with codecs.open(path, "r", "utf-8") as f:
            return f.read()

    def test_all_files(self):
        """
        findstatic returns all candidate files if run without --first and -v1.
        """
        result = call_command('findstatic', 'test/file.txt', verbosity=1, stdout=StringIO())
        lines = [l.strip() for l in result.split('\n')]
        self.assertEqual(len(lines), 3)  # three because there is also the "Found <file> here" line
        self.assertIn('project', lines[1])
        self.assertIn('apps', lines[2])

    def test_all_files_less_verbose(self):
        """
        findstatic returns all candidate files if run without --first and -v0.
        """
        result = call_command('findstatic', 'test/file.txt', verbosity=0, stdout=StringIO())
        lines = [l.strip() for l in result.split('\n')]
        self.assertEqual(len(lines), 2)
        self.assertIn('project', lines[0])
        self.assertIn('apps', lines[1])

    def test_all_files_more_verbose(self):
        """
        findstatic returns all candidate files if run without --first and -v2.
        Also, test that findstatic returns the searched locations with -v2.
        """
        result = call_command('findstatic', 'test/file.txt', verbosity=2, stdout=StringIO())
        lines = [l.strip() for l in result.split('\n')]
        self.assertIn('project', lines[1])
        self.assertIn('apps', lines[2])
        self.assertIn("Looking in the following locations:", lines[3])
        searched_locations = ', '.join(lines[4:])
        # AppDirectoriesFinder searched locations
        self.assertIn(os.path.join('staticfiles_tests', 'apps', 'test', 'static'), searched_locations)
        self.assertIn(os.path.join('staticfiles_tests', 'apps', 'no_label', 'static'), searched_locations)
        # FileSystemFinder searched locations
        self.assertIn(TEST_SETTINGS['STATICFILES_DIRS'][1][1], searched_locations)
        self.assertIn(TEST_SETTINGS['STATICFILES_DIRS'][0], searched_locations)
        # DefaultStorageFinder searched locations
        self.assertIn(
            os.path.join('staticfiles_tests', 'project', 'site_media', 'media'),
            searched_locations
        )


class TestConfiguration(StaticFilesTestCase):
    def test_location_empty(self):
        msg = 'without having set the STATIC_ROOT setting to a filesystem path'
        err = StringIO()
        for root in ['', None]:
            with override_settings(STATIC_ROOT=root):
                with self.assertRaisesMessage(ImproperlyConfigured, msg):
                    call_command('collectstatic', interactive=False, verbosity=0, stderr=err)

    def test_local_storage_detection_helper(self):
        staticfiles_storage = storage.staticfiles_storage
        try:
            storage.staticfiles_storage._wrapped = empty
            with self.settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.StaticFilesStorage'):
                command = collectstatic.Command()
                self.assertTrue(command.is_local_storage())

            storage.staticfiles_storage._wrapped = empty
            with self.settings(STATICFILES_STORAGE='staticfiles_tests.storage.DummyStorage'):
                command = collectstatic.Command()
                self.assertFalse(command.is_local_storage())

            collectstatic.staticfiles_storage = storage.FileSystemStorage()
            command = collectstatic.Command()
            self.assertTrue(command.is_local_storage())

            collectstatic.staticfiles_storage = DummyStorage()
            command = collectstatic.Command()
            self.assertFalse(command.is_local_storage())
        finally:
            staticfiles_storage._wrapped = empty
            collectstatic.staticfiles_storage = staticfiles_storage
            storage.staticfiles_storage = staticfiles_storage


class TestCollectionHelpSubcommand(AdminScriptTestCase):
    @override_settings(STATIC_ROOT=None)
    def test_missing_settings_dont_prevent_help(self):
        """
        Even if the STATIC_ROOT setting is not set, one can still call the
        `manage.py help collectstatic` command.
        """
        self.write_settings('settings.py', apps=['django.contrib.staticfiles'])
        out, err = self.run_manage(['help', 'collectstatic'])
        self.assertNoOutput(err)


class TestCollection(TestDefaults, CollectionTestCase):
    """
    Test ``collectstatic`` management command.
    """
    def test_ignore(self):
        """
        -i patterns are ignored.
        """
        self.assertFileNotFound('test/test.ignoreme')

    def test_common_ignore_patterns(self):
        """
        Common ignore patterns (*~, .*, CVS) are ignored.
        """
        self.assertFileNotFound('test/.hidden')
        self.assertFileNotFound('test/backup~')
        self.assertFileNotFound('test/CVS')


class TestCollectionVerbosity(CollectionTestCase):
    copying_msg = 'Copying '
    run_collectstatic_in_setUp = False
    post_process_msg = 'Post-processed'
    staticfiles_copied_msg = 'static files copied to'

    def test_verbosity_0(self):
        stdout = StringIO()
        self.run_collectstatic(verbosity=0, stdout=stdout)
        self.assertEqual(stdout.getvalue(), '')

    def test_verbosity_1(self):
        stdout = StringIO()
        self.run_collectstatic(verbosity=1, stdout=stdout)
        output = stdout.getvalue()
        self.assertIn(self.staticfiles_copied_msg, output)
        self.assertNotIn(self.copying_msg, output)

    def test_verbosity_2(self):
        stdout = StringIO()
        self.run_collectstatic(verbosity=2, stdout=stdout)
        output = stdout.getvalue()
        self.assertIn(self.staticfiles_copied_msg, output)
        self.assertIn(self.copying_msg, output)

    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.ManifestStaticFilesStorage')
    def test_verbosity_1_with_post_process(self):
        stdout = StringIO()
        self.run_collectstatic(verbosity=1, stdout=stdout, post_process=True)
        self.assertNotIn(self.post_process_msg, stdout.getvalue())

    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.ManifestStaticFilesStorage')
    def test_verbosity_2_with_post_process(self):
        stdout = StringIO()
        self.run_collectstatic(verbosity=2, stdout=stdout, post_process=True)
        self.assertIn(self.post_process_msg, stdout.getvalue())


class TestCollectionClear(CollectionTestCase):
    """
    Test the ``--clear`` option of the ``collectstatic`` management command.
    """
    def run_collectstatic(self, **kwargs):
        clear_filepath = os.path.join(settings.STATIC_ROOT, 'cleared.txt')
        with open(clear_filepath, 'w') as f:
            f.write('should be cleared')
        super().run_collectstatic(clear=True)

    def test_cleared_not_found(self):
        self.assertFileNotFound('cleared.txt')

    def test_dir_not_exists(self, **kwargs):
        shutil.rmtree(settings.STATIC_ROOT)
        super().run_collectstatic(clear=True)

    @override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.PathNotImplementedStorage')
    def test_handle_path_notimplemented(self):
        self.run_collectstatic()
        self.assertFileNotFound('cleared.txt')


class TestInteractiveMessages(CollectionTestCase):
    overwrite_warning_msg = "This will overwrite existing files!"
    delete_warning_msg = "This will DELETE ALL FILES in this location!"
    files_copied_msg = "static files copied"

    @staticmethod
    def mock_input(stdout):
        def _input(msg):
            stdout.write(msg)
            return 'yes'
        return _input

    def test_warning_when_clearing_staticdir(self):
        stdout = StringIO()
        self.run_collectstatic()
        with mock.patch('builtins.input', side_effect=self.mock_input(stdout)):
            call_command('collectstatic', interactive=True, clear=True, stdout=stdout)

        output = stdout.getvalue()
        self.assertNotIn(self.overwrite_warning_msg, output)
        self.assertIn(self.delete_warning_msg, output)

    def test_warning_when_overwriting_files_in_staticdir(self):
        stdout = StringIO()
        self.run_collectstatic()
        with mock.patch('builtins.input', side_effect=self.mock_input(stdout)):
            call_command('collectstatic', interactive=True, stdout=stdout)
        output = stdout.getvalue()
        self.assertIn(self.overwrite_warning_msg, output)
        self.assertNotIn(self.delete_warning_msg, output)

    def test_no_warning_when_staticdir_does_not_exist(self):
        stdout = StringIO()
        shutil.rmtree(settings.STATIC_ROOT)
        call_command('collectstatic', interactive=True, stdout=stdout)
        output = stdout.getvalue()
        self.assertNotIn(self.overwrite_warning_msg, output)
        self.assertNotIn(self.delete_warning_msg, output)
        self.assertIn(self.files_copied_msg, output)

    def test_no_warning_for_empty_staticdir(self):
        stdout = StringIO()
        with tempfile.TemporaryDirectory(prefix='collectstatic_empty_staticdir_test') as static_dir:
            with override_settings(STATIC_ROOT=static_dir):
                call_command('collectstatic', interactive=True, stdout=stdout)
        output = stdout.getvalue()
        self.assertNotIn(self.overwrite_warning_msg, output)
        self.assertNotIn(self.delete_warning_msg, output)
        self.assertIn(self.files_copied_msg, output)

    def test_cancelled(self):
        self.run_collectstatic()
        with mock.patch('builtins.input', side_effect=lambda _: 'no'):
            with self.assertRaisesMessage(CommandError, 'Collecting static files cancelled'):
                call_command('collectstatic', interactive=True)


class TestCollectionExcludeNoDefaultIgnore(TestDefaults, CollectionTestCase):
    """
    Test ``--exclude-dirs`` and ``--no-default-ignore`` options of the
    ``collectstatic`` management command.
    """
    def run_collectstatic(self):
        super().run_collectstatic(use_default_ignore_patterns=False)

    def test_no_common_ignore_patterns(self):
        """
        With --no-default-ignore, common ignore patterns (*~, .*, CVS)
        are not ignored.
        """
        self.assertFileContains('test/.hidden', 'should be ignored')
        self.assertFileContains('test/backup~', 'should be ignored')
        self.assertFileContains('test/CVS', 'should be ignored')


@override_settings(INSTALLED_APPS=[
    'staticfiles_tests.apps.staticfiles_config.IgnorePatternsAppConfig',
    'staticfiles_tests.apps.test',
])
class TestCollectionCustomIgnorePatterns(CollectionTestCase):
    def test_custom_ignore_patterns(self):
        """
        A custom ignore_patterns list, ['*.css', '*/vendor/*.js'] in this case,
        can be specified in an AppConfig definition.
        """
        self.assertFileNotFound('test/nonascii.css')
        self.assertFileContains('test/.hidden', 'should be ignored')
        self.assertFileNotFound(os.path.join('test', 'vendor', 'module.js'))


class TestCollectionDryRun(TestNoFilesCreated, CollectionTestCase):
    """
    Test ``--dry-run`` option for ``collectstatic`` management command.
    """
    def run_collectstatic(self):
        super().run_collectstatic(dry_run=True)


class TestCollectionFilesOverride(CollectionTestCase):
    """
    Test overriding duplicated files by ``collectstatic`` management command.
    Check for proper handling of apps order in installed apps even if file modification
    dates are in different order:
        'staticfiles_test_app',
        'staticfiles_tests.apps.no_label',
    """
    def setUp(self):
        self.temp_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.temp_dir)

        # get modification and access times for no_label/static/file2.txt
        self.orig_path = os.path.join(TEST_ROOT, 'apps', 'no_label', 'static', 'file2.txt')
        self.orig_mtime = os.path.getmtime(self.orig_path)
        self.orig_atime = os.path.getatime(self.orig_path)

        # prepare duplicate of file2.txt from a temporary app
        # this file will have modification time older than no_label/static/file2.txt
        # anyway it should be taken to STATIC_ROOT because the temporary app is before
        # 'no_label' app in installed apps
        self.temp_app_path = os.path.join(self.temp_dir, 'staticfiles_test_app')
        self.testfile_path = os.path.join(self.temp_app_path, 'static', 'file2.txt')

        os.makedirs(self.temp_app_path)
        with open(os.path.join(self.temp_app_path, '__init__.py'), 'w+'):
            pass

        os.makedirs(os.path.dirname(self.testfile_path))
        with open(self.testfile_path, 'w+') as f:
            f.write('duplicate of file2.txt')

        os.utime(self.testfile_path, (self.orig_atime - 1, self.orig_mtime - 1))

        self.settings_with_test_app = self.modify_settings(
            INSTALLED_APPS={'prepend': 'staticfiles_test_app'},
        )
        with extend_sys_path(self.temp_dir):
            self.settings_with_test_app.enable()

        super().setUp()

    def tearDown(self):
        super().tearDown()
        self.settings_with_test_app.disable()

    def test_ordering_override(self):
        """
        Test if collectstatic takes files in proper order
        """
        self.assertFileContains('file2.txt', 'duplicate of file2.txt')

        # run collectstatic again
        self.run_collectstatic()

        self.assertFileContains('file2.txt', 'duplicate of file2.txt')


# The collectstatic test suite already has conflicting files since both
# project/test/file.txt and apps/test/static/test/file.txt are collected. To
# properly test for the warning not happening unless we tell it to explicitly,
# we remove the project directory and will add back a conflicting file later.
@override_settings(STATICFILES_DIRS=[])
class TestCollectionOverwriteWarning(CollectionTestCase):
    """
    Test warning in ``collectstatic`` output when a file is skipped because a
    previous file was already written to the same path.
    """
    # If this string is in the collectstatic output, it means the warning we're
    # looking for was emitted.
    warning_string = 'Found another file'

    def _collectstatic_output(self, **kwargs):
        """
        Run collectstatic, and capture and return the output. We want to run
        the command at highest verbosity, which is why we can't
        just call e.g. BaseCollectionTestCase.run_collectstatic()
        """
        out = StringIO()
        call_command('collectstatic', interactive=False, verbosity=3, stdout=out, **kwargs)
        return out.getvalue()

    def test_no_warning(self):
        """
        There isn't a warning if there isn't a duplicate destination.
        """
        output = self._collectstatic_output(clear=True)
        self.assertNotIn(self.warning_string, output)

    def test_warning(self):
        """
        There is a warning when there are duplicate destinations.
        """
        with tempfile.TemporaryDirectory() as static_dir:
            duplicate = os.path.join(static_dir, 'test', 'file.txt')
            os.mkdir(os.path.dirname(duplicate))
            with open(duplicate, 'w+') as f:
                f.write('duplicate of file.txt')

            with self.settings(STATICFILES_DIRS=[static_dir]):
                output = self._collectstatic_output(clear=True)
            self.assertIn(self.warning_string, output)

            os.remove(duplicate)

            # Make sure the warning went away again.
            with self.settings(STATICFILES_DIRS=[static_dir]):
                output = self._collectstatic_output(clear=True)
            self.assertNotIn(self.warning_string, output)


@override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.DummyStorage')
class TestCollectionNonLocalStorage(TestNoFilesCreated, CollectionTestCase):
    """
    Tests for a Storage that implements get_modified_time() but not path()
    (#15035).
    """
    def test_storage_properties(self):
        # Properties of the Storage as described in the ticket.
        storage = DummyStorage()
        self.assertEqual(storage.get_modified_time('name'), datetime.datetime(1970, 1, 1, tzinfo=timezone.utc))
        with self.assertRaisesMessage(NotImplementedError, "This backend doesn't support absolute paths."):
            storage.path('name')


class TestCollectionNeverCopyStorage(CollectionTestCase):

    @override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.NeverCopyRemoteStorage')
    def test_skips_newer_files_in_remote_storage(self):
        """
        collectstatic skips newer files in a remote storage.
        run_collectstatic() in setUp() copies the static files, then files are
        always skipped after NeverCopyRemoteStorage is activated since
        NeverCopyRemoteStorage.get_modified_time() returns a datetime in the
        future to simulate an unmodified file.
        """
        stdout = StringIO()
        self.run_collectstatic(stdout=stdout, verbosity=2)
        output = stdout.getvalue()
        self.assertIn("Skipping 'test.txt' (not modified)", output)


@unittest.skipUnless(symlinks_supported(), "Must be able to symlink to run this test.")
class TestCollectionLinks(TestDefaults, CollectionTestCase):
    """
    Test ``--link`` option for ``collectstatic`` management command.

    Note that by inheriting ``TestDefaults`` we repeat all
    the standard file resolving tests here, to make sure using
    ``--link`` does not change the file-selection semantics.
    """
    def run_collectstatic(self, clear=False, link=True, **kwargs):
        super().run_collectstatic(link=link, clear=clear, **kwargs)

    def test_links_created(self):
        """
        With ``--link``, symbolic links are created.
        """
        self.assertTrue(os.path.islink(os.path.join(settings.STATIC_ROOT, 'test.txt')))

    def test_broken_symlink(self):
        """
        Test broken symlink gets deleted.
        """
        path = os.path.join(settings.STATIC_ROOT, 'test.txt')
        os.unlink(path)
        self.run_collectstatic()
        self.assertTrue(os.path.islink(path))

    def test_symlinks_and_files_replaced(self):
        """
        Running collectstatic in non-symlink mode replaces symlinks with files,
        while symlink mode replaces files with symlinks.
        """
        path = os.path.join(settings.STATIC_ROOT, 'test.txt')
        self.assertTrue(os.path.islink(path))
        self.run_collectstatic(link=False)
        self.assertFalse(os.path.islink(path))
        self.run_collectstatic(link=True)
        self.assertTrue(os.path.islink(path))

    def test_clear_broken_symlink(self):
        """
        With ``--clear``, broken symbolic links are deleted.
        """
        nonexistent_file_path = os.path.join(settings.STATIC_ROOT, 'nonexistent.txt')
        broken_symlink_path = os.path.join(settings.STATIC_ROOT, 'symlink.txt')
        os.symlink(nonexistent_file_path, broken_symlink_path)
        self.run_collectstatic(clear=True)
        self.assertFalse(os.path.lexists(broken_symlink_path))

    @override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.PathNotImplementedStorage')
    def test_no_remote_link(self):
        with self.assertRaisesMessage(CommandError, "Can't symlink to a remote destination."):
            self.run_collectstatic()
