# Copyright 2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

import io

from _emerge.CompositeTask import CompositeTask
from _emerge.EbuildProcess import EbuildProcess
from _emerge.SpawnProcess import SpawnProcess

import portage
from portage import os
from portage import _encodings
from portage import _unicode_encode
from portage.util._async.AsyncFunction import AsyncFunction
from portage.util.install_mask import install_mask_dir, InstallMask


class PackagePhase(CompositeTask):
    """
    Invokes the package phase and handles PKG_INSTALL_MASK.
    """

    __slots__ = (
        "actionmap",
        "fd_pipes",
        "logfile",
        "settings",
        "_pkg_install_mask",
        "_proot",
    )

    _shell_binary = portage.const.BASH_BINARY

    def _start(self):
        try:
            with io.open(
                _unicode_encode(
                    os.path.join(
                        self.settings["PORTAGE_BUILDDIR"],
                        "build-info",
                        "PKG_INSTALL_MASK",
                    ),
                    encoding=_encodings["fs"],
                    errors="strict",
                ),
                mode="r",
                encoding=_encodings["repo.content"],
                errors="replace",
            ) as f:
                self._pkg_install_mask = InstallMask(f.read())
        except EnvironmentError:
            self._pkg_install_mask = None
        if self._pkg_install_mask:
            self._proot = os.path.join(self.settings["T"], "packaging")
            self._start_task(
                SpawnProcess(
                    args=[
                        self._shell_binary,
                        "-e",
                        "-c",
                        (
                            "rm -rf {PROOT}; "
                            'cp -pPR $(cp --help | grep -q -- "^[[:space:]]*-l," && echo -l)'
                            ' "${{D}}" {PROOT}'
                        ).format(PROOT=portage._shell_quote(self._proot)),
                    ],
                    background=self.background,
                    env=self.settings.environ(),
                    scheduler=self.scheduler,
                    logfile=self.logfile,
                ),
                self._copy_proot_exit,
            )
        else:
            self._proot = self.settings["D"]
            self._start_package_phase()

    def _copy_proot_exit(self, proc):
        if self._default_exit(proc) != os.EX_OK:
            self.wait()
        else:
            self._start_task(
                AsyncFunction(
                    target=install_mask_dir,
                    args=(
                        os.path.join(
                            self._proot, self.settings["EPREFIX"].lstrip(os.sep)
                        ),
                        self._pkg_install_mask,
                    ),
                ),
                self._pkg_install_mask_exit,
            )

    def _pkg_install_mask_exit(self, proc):
        if self._default_exit(proc) != os.EX_OK:
            self.wait()
        else:
            self._start_package_phase()

    def _start_package_phase(self):
        ebuild_process = EbuildProcess(
            actionmap=self.actionmap,
            background=self.background,
            fd_pipes=self.fd_pipes,
            logfile=self.logfile,
            phase="package",
            scheduler=self.scheduler,
            settings=self.settings,
        )

        if self._pkg_install_mask:
            d_orig = self.settings["D"]
            try:
                self.settings["D"] = self._proot
                self._start_task(ebuild_process, self._pkg_install_mask_cleanup)
            finally:
                self.settings["D"] = d_orig
        else:
            self._start_task(ebuild_process, self._default_final_exit)

    def _pkg_install_mask_cleanup(self, proc):
        if self._default_exit(proc) != os.EX_OK:
            self.wait()
        else:
            self._start_task(
                SpawnProcess(
                    args=["rm", "-rf", self._proot],
                    background=self.background,
                    env=self.settings.environ(),
                    scheduler=self.scheduler,
                    logfile=self.logfile,
                ),
                self._default_final_exit,
            )