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from __future__ import absolute_import, unicode_literals

import abc
from textwrap import dedent

from six import add_metaclass

from virtualenv.create.describe import Python3Supports
from virtualenv.create.via_global_ref.builtin.ref import PathRefToDest
from virtualenv.create.via_global_ref.store import is_store_python
from virtualenv.util.path import Path

from .common import CPython, CPythonPosix, CPythonWindows, is_mac_os_framework


@add_metaclass(abc.ABCMeta)
class CPython3(CPython, Python3Supports):
    """ """


class CPython3Posix(CPythonPosix, CPython3):
    @classmethod
    def can_describe(cls, interpreter):
        return is_mac_os_framework(interpreter) is False and super(CPython3Posix, cls).can_describe(interpreter)

    def env_patch_text(self):
        text = super(CPython3Posix, self).env_patch_text()
        if self.pyvenv_launch_patch_active(self.interpreter):
            text += dedent(
                """
                # for https://github.com/python/cpython/pull/9516, see https://github.com/pypa/virtualenv/issues/1704
                import os
                if "__PYVENV_LAUNCHER__" in os.environ:
                    del os.environ["__PYVENV_LAUNCHER__"]
                """,
            )
        return text

    @classmethod
    def pyvenv_launch_patch_active(cls, interpreter):
        ver = interpreter.version_info
        return interpreter.platform == "darwin" and ((3, 7, 8) > ver >= (3, 7) or (3, 8, 3) > ver >= (3, 8))


class CPython3Windows(CPythonWindows, CPython3):
    """ """

    @classmethod
    def setup_meta(cls, interpreter):
        if is_store_python(interpreter):  # store python is not supported here
            return None
        return super(CPython3Windows, cls).setup_meta(interpreter)

    @classmethod
    def sources(cls, interpreter):
        for src in super(CPython3Windows, cls).sources(interpreter):
            yield src
        if not cls.has_shim(interpreter):
            for src in cls.include_dll_and_pyd(interpreter):
                yield src

    @classmethod
    def has_shim(cls, interpreter):
        return interpreter.version_info.minor >= 7 and cls.shim(interpreter) is not None

    @classmethod
    def shim(cls, interpreter):
        shim = Path(interpreter.system_stdlib) / "venv" / "scripts" / "nt" / "python.exe"
        if shim.exists():
            return shim
        return None

    @classmethod
    def host_python(cls, interpreter):
        if cls.has_shim(interpreter):
            # starting with CPython 3.7 Windows ships with a venvlauncher.exe that avoids the need for dll/pyd copies
            # it also means the wrapper must be copied to avoid bugs such as https://bugs.python.org/issue42013
            return cls.shim(interpreter)
        return super(CPython3Windows, cls).host_python(interpreter)

    @classmethod
    def include_dll_and_pyd(cls, interpreter):
        dll_folder = Path(interpreter.system_prefix) / "DLLs"
        host_exe_folder = Path(interpreter.system_executable).parent
        for folder in [host_exe_folder, dll_folder]:
            for file in folder.iterdir():
                if file.suffix in (".pyd", ".dll"):
                    yield PathRefToDest(file, dest=cls.to_dll_and_pyd)

    def to_dll_and_pyd(self, src):
        return self.bin_dir / src.name