# -*- coding: utf-8 -*-
import inspect
from io import BytesIO
from textwrap import dedent

from torch.package import PackageExporter, PackageImporter, is_from_package
from torch.testing._internal.common_utils import run_tests

try:
    from .common import PackageTestCase
except ImportError:
    # Support the case where we run this file directly.
    from common import PackageTestCase


class TestMisc(PackageTestCase):
    """Tests for one-off or random functionality. Try not to add to this!"""

    def test_file_structure(self):
        """
        Tests package's Directory structure representation of a zip file. Ensures
        that the returned Directory prints what is expected and filters
        inputs/outputs correctly.
        """
        buffer = BytesIO()

        export_plain = dedent(
            """\
                ├── .data
                │   ├── extern_modules
                │   └── version
                ├── main
                │   └── main
                ├── obj
                │   └── obj.pkl
                ├── package_a
                │   ├── __init__.py
                │   └── subpackage.py
                └── module_a.py
            """
        )
        export_include = dedent(
            """\
                ├── obj
                │   └── obj.pkl
                └── package_a
                    └── subpackage.py
            """
        )
        import_exclude = dedent(
            """\
                ├── .data
                │   ├── extern_modules
                │   └── version
                ├── main
                │   └── main
                ├── obj
                │   └── obj.pkl
                ├── package_a
                │   ├── __init__.py
                │   └── subpackage.py
                └── module_a.py
            """
        )

        with PackageExporter(buffer, verbose=False) as he:
            import module_a
            import package_a
            import package_a.subpackage

            obj = package_a.subpackage.PackageASubpackageObject()
            he.intern("**")
            he.save_module(module_a.__name__)
            he.save_module(package_a.__name__)
            he.save_pickle("obj", "obj.pkl", obj)
            he.save_text("main", "main", "my string")

        buffer.seek(0)
        hi = PackageImporter(buffer)

        file_structure = hi.file_structure()
        # remove first line from testing because WINDOW/iOS/Unix treat the buffer differently
        self.assertEqual(
            dedent("\n".join(str(file_structure).split("\n")[1:])),
            export_plain,
        )
        file_structure = hi.file_structure(include=["**/subpackage.py", "**/*.pkl"])
        self.assertEqual(
            dedent("\n".join(str(file_structure).split("\n")[1:])),
            export_include,
        )

        file_structure = hi.file_structure(exclude="**/*.storage")
        self.assertEqual(
            dedent("\n".join(str(file_structure).split("\n")[1:])),
            import_exclude,
        )

    def test_file_structure_has_file(self):
        """
        Test Directory's has_file() method.
        """
        buffer = BytesIO()
        with PackageExporter(buffer, verbose=False) as he:
            import package_a.subpackage

            he.intern("**")
            obj = package_a.subpackage.PackageASubpackageObject()
            he.save_pickle("obj", "obj.pkl", obj)

        buffer.seek(0)

        importer = PackageImporter(buffer)
        file_structure = importer.file_structure()
        self.assertTrue(file_structure.has_file("package_a/subpackage.py"))
        self.assertFalse(file_structure.has_file("package_a/subpackage"))

    def test_is_from_package(self):
        """is_from_package should work for objects and modules"""
        import package_a.subpackage

        buffer = BytesIO()
        obj = package_a.subpackage.PackageASubpackageObject()

        with PackageExporter(buffer, verbose=False) as pe:
            pe.intern("**")
            pe.save_pickle("obj", "obj.pkl", obj)

        buffer.seek(0)
        pi = PackageImporter(buffer)
        mod = pi.import_module("package_a.subpackage")
        loaded_obj = pi.load_pickle("obj", "obj.pkl")

        self.assertFalse(is_from_package(package_a.subpackage))
        self.assertTrue(is_from_package(mod))

        self.assertFalse(is_from_package(obj))
        self.assertTrue(is_from_package(loaded_obj))

    def test_inspect_class(self):
        """Should be able to retrieve source for a packaged class."""
        import package_a.subpackage

        buffer = BytesIO()
        obj = package_a.subpackage.PackageASubpackageObject()

        with PackageExporter(buffer, verbose=False) as pe:
            pe.intern("**")
            pe.save_pickle("obj", "obj.pkl", obj)

        buffer.seek(0)
        pi = PackageImporter(buffer)
        packaged_class = pi.import_module(
            "package_a.subpackage"
        ).PackageASubpackageObject
        regular_class = package_a.subpackage.PackageASubpackageObject

        packaged_src = inspect.getsourcelines(packaged_class)
        regular_src = inspect.getsourcelines(regular_class)
        self.assertEqual(packaged_src, regular_src)

    def test_dunder_package_present(self):
        """
        The attribute '__torch_package__' should be populated on imported modules.
        """
        import package_a.subpackage

        buffer = BytesIO()
        obj = package_a.subpackage.PackageASubpackageObject()

        with PackageExporter(buffer, verbose=False) as pe:
            pe.intern("**")
            pe.save_pickle("obj", "obj.pkl", obj)

        buffer.seek(0)
        pi = PackageImporter(buffer)
        mod = pi.import_module("package_a.subpackage")
        self.assertTrue(hasattr(mod, "__torch_package__"))

    def test_dunder_package_works_from_package(self):
        """
        The attribute '__torch_package__' should be accessible from within
        the module itself, so that packaged code can detect whether it's
        being used in a packaged context or not.
        """
        import package_a.use_dunder_package as mod

        buffer = BytesIO()

        with PackageExporter(buffer, verbose=False) as pe:
            pe.intern("**")
            pe.save_module(mod.__name__)

        buffer.seek(0)
        pi = PackageImporter(buffer)
        imported_mod = pi.import_module(mod.__name__)
        self.assertTrue(imported_mod.is_from_package())
        self.assertFalse(mod.is_from_package())

    def test_std_lib_sys_hackery_checks(self):
        """
        The standard library performs sys.module assignment hackery which
        causes modules who do this hackery to fail on import. See
        https://github.com/pytorch/pytorch/issues/57490 for more information.
        """
        import package_a.std_sys_module_hacks

        buffer = BytesIO()
        mod = package_a.std_sys_module_hacks.Module()

        with PackageExporter(buffer, verbose=False) as pe:
            pe.intern("**")
            pe.save_pickle("obj", "obj.pkl", mod)

        buffer.seek(0)
        pi = PackageImporter(buffer)
        mod = pi.load_pickle("obj", "obj.pkl")
        mod()


if __name__ == "__main__":
    run_tests()