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from __future__ import absolute_import, unicode_literals

import logging
from contextlib import contextmanager

from virtualenv.discovery.cached_py_info import LogCmd
from virtualenv.seed.embed.base_embed import BaseEmbed
from virtualenv.util.subprocess import Popen

from ..wheels import Version, get_wheel, pip_wheel_env_run


class PipInvoke(BaseEmbed):
    def __init__(self, options):
        super(PipInvoke, self).__init__(options)

    def run(self, creator):
        if not self.enabled:
            return
        for_py_version = creator.interpreter.version_release_str
        with self.get_pip_install_cmd(creator.exe, for_py_version) as cmd:
            env = pip_wheel_env_run(self.extra_search_dir, self.app_data, self.env)
            self._execute(cmd, env)

    @staticmethod
    def _execute(cmd, env):
        logging.debug("pip seed by running: %s", LogCmd(cmd, env))
        process = Popen(cmd, env=env)
        process.communicate()
        if process.returncode != 0:
            raise RuntimeError("failed seed with code {}".format(process.returncode))
        return process

    @contextmanager
    def get_pip_install_cmd(self, exe, for_py_version):
        cmd = [str(exe), "-m", "pip", "-q", "install", "--only-binary", ":all:", "--disable-pip-version-check"]
        if not self.download:
            cmd.append("--no-index")
        folders = set()
        for dist, version in self.distribution_to_versions().items():
            wheel = get_wheel(
                distribution=dist,
                version=version,
                for_py_version=for_py_version,
                search_dirs=self.extra_search_dir,
                download=False,
                app_data=self.app_data,
                do_periodic_update=self.periodic_update,
                env=self.env,
            )
            if wheel is None:
                raise RuntimeError("could not get wheel for distribution {}".format(dist))
            folders.add(str(wheel.path.parent))
            cmd.append(Version.as_pip_req(dist, wheel.version))
        for folder in sorted(folders):
            cmd.extend(["--find-links", str(folder)])
        yield cmd