import re
import os
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest
from django.conf import settings

from django_components.util.loader import _filepath_to_python_module, get_component_dirs, get_component_files

from django_components.testing import djc_test
from .testutils import setup_test_config

setup_test_config({"autodiscover": False})


@djc_test
class TestComponentDirs:
    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
    )
    def test_get_dirs__base_dir(self):
        dirs = sorted(get_component_dirs())

        apps_dirs = [dirs[0], dirs[2]]
        own_dirs = [dirs[1], *dirs[3:]]

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]

        # Apps with a `components` dir
        assert len(apps_dirs) == 2

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-2:] == ("django_components", "components")
        assert apps_dirs[1].parts[-3:] == ("tests", "test_app", "components")

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve() / "test_structures" / "test_structure_1",  # noqa
        },
    )
    def test_get_dirs__base_dir__complex(self):
        dirs = sorted(get_component_dirs())

        apps_dirs = dirs[:2]
        own_dirs = dirs[2:]

        # Apps with a `components` dir
        assert len(apps_dirs) == 2

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-2:] == ("django_components", "components")
        assert apps_dirs[1].parts[-3:] == ("tests", "test_app", "components")

        expected = [
            Path(__file__).parent.resolve() / "test_structures" / "test_structure_1" / "components",
        ]
        assert own_dirs == expected

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
            "STATICFILES_DIRS": [
                Path(__file__).parent.resolve() / "components",
                ("with_alias", Path(__file__).parent.resolve() / "components"),
                ("too_many", Path(__file__).parent.resolve() / "components", Path(__file__).parent.resolve()),
                ("with_not_str_alias", 3),
            ],  # noqa
        },
    )
    @patch("django_components.util.loader.logger.warning")
    def test_get_dirs__components_dirs(self, mock_warning: MagicMock):
        mock_warning.reset_mock()
        dirs = sorted(get_component_dirs())

        apps_dirs = [dirs[0], dirs[2]]
        own_dirs = [dirs[1], *dirs[3:]]

        # Apps with a `components` dir
        assert len(apps_dirs) == 2

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-2:] == ("django_components", "components")
        assert apps_dirs[1].parts[-3:] == ("tests", "test_app", "components")

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]

        warn_inputs = [warn.args[0] for warn in mock_warning.call_args_list]
        assert "Got <class 'int'> : 3" in warn_inputs[0]

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "dirs": [],
        },
    )
    def test_get_dirs__components_dirs__empty(self):
        dirs = sorted(get_component_dirs())

        apps_dirs = dirs

        # Apps with a `components` dir
        assert len(apps_dirs) == 2

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-2:] == ("django_components", "components")
        assert apps_dirs[1].parts[-3:] == ("tests", "test_app", "components")

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "dirs": ["components"],
        },
    )
    def test_get_dirs__componenents_dirs__raises_on_relative_path_1(self):
        with pytest.raises(ValueError, match=re.escape("COMPONENTS.dirs must contain absolute paths")):
            get_component_dirs()

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "dirs": [("with_alias", "components")],
        },
    )
    def test_get_dirs__component_dirs__raises_on_relative_path_2(self):
        with pytest.raises(ValueError, match=re.escape("COMPONENTS.dirs must contain absolute paths")):
            get_component_dirs()

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "app_dirs": ["custom_comps_dir"],
        },
    )
    def test_get_dirs__app_dirs(self):
        dirs = sorted(get_component_dirs())

        apps_dirs = dirs[1:]
        own_dirs = dirs[:1]

        # Apps with a `components` dir
        assert len(apps_dirs) == 1

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-3:] == ("tests", "test_app", "custom_comps_dir")

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "app_dirs": [],
        },
    )
    def test_get_dirs__app_dirs_empty(self):
        dirs = sorted(get_component_dirs())

        own_dirs = dirs

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
        components_settings={
            "app_dirs": ["this_dir_does_not_exist"],
        },
    )
    def test_get_dirs__app_dirs_not_found(self):
        dirs = sorted(get_component_dirs())

        own_dirs = dirs

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
            "INSTALLED_APPS": ("django_components", "tests.test_app_nested.app"),
        },
    )
    def test_get_dirs__nested_apps(self):
        dirs = sorted(get_component_dirs())

        apps_dirs = [dirs[0], *dirs[2:]]
        own_dirs = [dirs[1]]

        # Apps with a `components` dir
        assert len(apps_dirs) == 2

        # NOTE: Compare parts so that the test works on Windows too
        assert apps_dirs[0].parts[-2:] == ("django_components", "components")
        assert apps_dirs[1].parts[-4:] == ("tests", "test_app_nested", "app", "components")

        assert own_dirs == [
            # Top-level /components dir
            Path(__file__).parent.resolve()
            / "components",
        ]


@djc_test
class TestComponentFiles:
    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
    )
    def test_get_files__py(self):
        files = sorted(get_component_files(".py"))

        dot_paths = [f.dot_path for f in files]
        file_paths = [f.filepath for f in files]

        assert dot_paths == [
            "components",
            "components.multi_file.multi_file",
            "components.relative_file.relative_file",
            "components.relative_file_pathobj.relative_file_pathobj",
            "components.single_file",
            "components.staticfiles.staticfiles",
            "components.urls",
            "django_components.components",
            "django_components.components.dynamic",
            "tests.test_app.components.app_lvl_comp.app_lvl_comp",
        ]

        # NOTE: Compare parts so that the test works on Windows too
        assert file_paths[0].parts[-3:] == ("tests", "components", "__init__.py")
        assert file_paths[1].parts[-4:] == ("tests", "components", "multi_file", "multi_file.py")
        assert file_paths[2].parts[-4:] == ("tests", "components", "relative_file", "relative_file.py")
        assert file_paths[3].parts[-4:] == ("tests", "components", "relative_file_pathobj", "relative_file_pathobj.py")
        assert file_paths[4].parts[-3:] == ("tests", "components", "single_file.py")
        assert file_paths[5].parts[-4:] == ("tests", "components", "staticfiles", "staticfiles.py")
        assert file_paths[6].parts[-3:] == ("tests", "components", "urls.py")
        assert file_paths[7].parts[-3:] == ("django_components", "components", "__init__.py")
        assert file_paths[8].parts[-3:] == ("django_components", "components", "dynamic.py")
        assert file_paths[9].parts[-5:] == ("tests", "test_app", "components", "app_lvl_comp", "app_lvl_comp.py")

    @djc_test(
        django_settings={
            "BASE_DIR": Path(__file__).parent.resolve(),
        },
    )
    def test_get_files__js(self):
        files = sorted(get_component_files(".js"))

        dot_paths = [f.dot_path for f in files]
        file_paths = [f.filepath for f in files]

        assert dot_paths == [
            "components.relative_file.relative_file",
            "components.relative_file_pathobj.relative_file_pathobj",
            "components.staticfiles.staticfiles",
            "tests.test_app.components.app_lvl_comp.app_lvl_comp",
        ]

        # NOTE: Compare parts so that the test works on Windows too
        assert file_paths[0].parts[-4:] == ("tests", "components", "relative_file", "relative_file.js")
        assert file_paths[1].parts[-4:] == ("tests", "components", "relative_file_pathobj", "relative_file_pathobj.js")
        assert file_paths[2].parts[-4:] == ("tests", "components", "staticfiles", "staticfiles.js")
        assert file_paths[3].parts[-5:] == ("tests", "test_app", "components", "app_lvl_comp", "app_lvl_comp.js")


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

        the_path = os.path.join(base_path, "tests.py")
        assert _filepath_to_python_module(the_path, base_path, None) == "tests"

        the_path = os.path.join(base_path, "tests/components/relative_file/relative_file.py")
        assert _filepath_to_python_module(the_path, base_path, None) == "tests.components.relative_file.relative_file"

    def test_handles_separators_based_on_os_name(self):
        base_path = str(settings.BASE_DIR)

        with patch("os.name", new="posix"):
            the_path = base_path + "/" + "tests.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests"

            the_path = base_path + "/" + "tests/components/relative_file/relative_file.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests.components.relative_file.relative_file"  # noqa: E501

        base_path = str(settings.BASE_DIR).replace("/", "\\")
        with patch("os.name", new="nt"):
            the_path = base_path + "\\" + "tests.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests"

            the_path = base_path + "\\" + "tests\\components\\relative_file\\relative_file.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests.components.relative_file.relative_file"  # noqa: E501

            # NOTE: Windows should handle also POSIX separator
            the_path = base_path + "/" + "tests.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests"

            the_path = base_path + "/" + "tests/components/relative_file/relative_file.py"
            assert _filepath_to_python_module(the_path, base_path, None) == "tests.components.relative_file.relative_file"  # noqa: E501