import os
import sys
from unittest import TestCase, mock

from django.conf import settings

from django_components import AlreadyRegistered, registry
from django_components.autodiscover import _filepath_to_python_module, autodiscover, import_libraries

from .django_test_setup import setup_test_config


# NOTE: This is different from BaseTestCase in testutils.py, because here we need
# TestCase instead of SimpleTestCase.
class _TestCase(TestCase):
    def tearDown(self) -> None:
        super().tearDown()
        registry.clear()


class TestAutodiscover(_TestCase):
    def test_autodiscover(self):
        setup_test_config({"autodiscover": False})

        all_components = registry.all().copy()
        self.assertNotIn("single_file_component", all_components)
        self.assertNotIn("multi_file_component", all_components)
        self.assertNotIn("relative_file_component", all_components)
        self.assertNotIn("relative_file_pathobj_component", all_components)

        try:
            modules = autodiscover(map_module=lambda p: "tests." + p)
        except AlreadyRegistered:
            self.fail("Autodiscover should not raise AlreadyRegistered exception")

        self.assertIn("tests.components.single_file", modules)
        self.assertIn("tests.components.multi_file.multi_file", modules)
        self.assertIn("tests.components.relative_file_pathobj.relative_file_pathobj", modules)
        self.assertIn("tests.components.relative_file.relative_file", modules)

        all_components = registry.all().copy()
        self.assertIn("single_file_component", all_components)
        self.assertIn("multi_file_component", all_components)
        self.assertIn("relative_file_component", all_components)
        self.assertIn("relative_file_pathobj_component", all_components)


class TestImportLibraries(_TestCase):
    def test_import_libraries(self):
        # Prepare settings
        setup_test_config(
            {
                "autodiscover": False,
            }
        )
        settings.COMPONENTS["libraries"] = ["tests.components.single_file", "tests.components.multi_file.multi_file"]

        # Ensure we start with a clean state
        registry.clear()
        all_components = registry.all().copy()
        self.assertNotIn("single_file_component", all_components)
        self.assertNotIn("multi_file_component", all_components)

        # Ensure that the modules are executed again after import
        if "tests.components.single_file" in sys.modules:
            del sys.modules["tests.components.single_file"]
        if "tests.components.multi_file.multi_file" in sys.modules:
            del sys.modules["tests.components.multi_file.multi_file"]

        try:
            modules = import_libraries()
        except AlreadyRegistered:
            self.fail("Autodiscover should not raise AlreadyRegistered exception")

        self.assertIn("tests.components.single_file", modules)
        self.assertIn("tests.components.multi_file.multi_file", modules)

        all_components = registry.all().copy()
        self.assertIn("single_file_component", all_components)
        self.assertIn("multi_file_component", all_components)

        settings.COMPONENTS["libraries"] = []

    def test_import_libraries_map_modules(self):
        # Prepare settings
        setup_test_config(
            {
                "autodiscover": False,
            }
        )
        settings.COMPONENTS["libraries"] = ["components.single_file", "components.multi_file.multi_file"]

        # Ensure we start with a clean state
        registry.clear()
        all_components = registry.all().copy()
        self.assertNotIn("single_file_component", all_components)
        self.assertNotIn("multi_file_component", all_components)

        # Ensure that the modules are executed again after import
        if "tests.components.single_file" in sys.modules:
            del sys.modules["tests.components.single_file"]
        if "tests.components.multi_file.multi_file" in sys.modules:
            del sys.modules["tests.components.multi_file.multi_file"]

        try:
            modules = import_libraries(map_module=lambda p: "tests." + p)
        except AlreadyRegistered:
            self.fail("Autodiscover should not raise AlreadyRegistered exception")

        self.assertIn("tests.components.single_file", modules)
        self.assertIn("tests.components.multi_file.multi_file", modules)

        all_components = registry.all().copy()
        self.assertIn("single_file_component", all_components)
        self.assertIn("multi_file_component", all_components)

        settings.COMPONENTS["libraries"] = []


class TestFilepathToPythonModule(_TestCase):
    def test_prepares_path(self):
        base_path = str(settings.BASE_DIR)

        the_path = os.path.join(base_path, "tests.py")
        self.assertEqual(
            _filepath_to_python_module(the_path),
            "tests",
        )

        the_path = os.path.join(base_path, "tests/components/relative_file/relative_file.py")
        self.assertEqual(
            _filepath_to_python_module(the_path),
            "tests.components.relative_file.relative_file",
        )

    def test_handles_nonlinux_paths(self):
        base_path = str(settings.BASE_DIR).replace("/", "//")

        with mock.patch("os.path.sep", new="//"):
            the_path = os.path.join(base_path, "tests.py")
            self.assertEqual(
                _filepath_to_python_module(the_path),
                "tests",
            )

            the_path = os.path.join(base_path, "tests//components//relative_file//relative_file.py")
            self.assertEqual(
                _filepath_to_python_module(the_path),
                "tests.components.relative_file.relative_file",
            )

        base_path = str(settings.BASE_DIR).replace("//", "\\")
        with mock.patch("os.path.sep", new="\\"):
            the_path = os.path.join(base_path, "tests.py")
            self.assertEqual(
                _filepath_to_python_module(the_path),
                "tests",
            )

            the_path = os.path.join(base_path, "tests\\components\\relative_file\\relative_file.py")
            self.assertEqual(
                _filepath_to_python_module(the_path),
                "tests.components.relative_file.relative_file",
            )