#!/usr/bin/env python
# Copyright (c) 2009, Willow Garage, Inc.
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#       this software without specific prior written permission.
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# Author Tully Foote/tfoote@willowgarage.com

import subprocess

from ..installers import PackageManagerInstaller
from .source import SOURCE_INSTALLER

ARCH_OS_NAME = 'arch'
PACMAN_INSTALLER = 'pacman'

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

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

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)]
