# Copyright (c) 2009, Willow Garage, Inc.
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# Author Tully Foote/tfoote@willowgarage.com

import subprocess
import sys

from rospkg.os_detect import OS_ARCH, OS_MANJARO

from ..installers import PackageManagerInstaller
from .source import SOURCE_INSTALLER
from .pip import PIP_INSTALLER

PACMAN_INSTALLER = 'pacman'


def register_installers(context):
    context.set_installer(PACMAN_INSTALLER, PacmanInstaller())


def register_platforms(context):
    context.add_os_installer_key(OS_ARCH, SOURCE_INSTALLER)
    context.add_os_installer_key(OS_ARCH, PACMAN_INSTALLER)
    context.add_os_installer_key(OS_ARCH, PIP_INSTALLER)
    context.set_default_os_installer_key(OS_ARCH, lambda self: PACMAN_INSTALLER)

    register_manjaro(context)


def register_manjaro(context):
    # Manjaro uses the same packages as Arch Linux. Override to Arch if detected
    (os_name, os_version) = context.get_os_name_and_version()
    if os_name == OS_MANJARO and not context.os_override:
        print('rosdep detected OS: [%s] aliasing it to: [%s]' %
              (OS_MANJARO, OS_ARCH), file=sys.stderr)
        context.set_os_override(OS_ARCH, context.os_detect.get_codename())


def pacman_detect_single(p):
    return not subprocess.call(['pacman', '-T', p], stdout=subprocess.PIPE, stderr=subprocess.PIPE)


def pacman_detect(packages):
    return [p for p in packages if pacman_detect_single(p)]


class PacmanInstaller(PackageManagerInstaller):

    def __init__(self):
        super(PacmanInstaller, self).__init__(pacman_detect)

    def get_install_command(self, resolved, interactive=True, reinstall=False, quiet=False):
        packages = self.get_packages_to_install(resolved, reinstall=reinstall)
        if not packages:
            return []

        command = ['pacman', '-S']

        if not interactive:
            command.append('--noconfirm')
        if not reinstall:
            command.append('--needed')
        if quiet:
            command.append('-q')

        return [self.elevate_priv(command + packages)]
