# Copyright (c) 2009, Willow Garage, Inc.
# Copyright (c) 2012, Intermodalics, BVBA.
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# Author Ruben Smits/ruben.smits@intermodalics.eu

import subprocess

from ..core import InstallFailed
from ..installers import PackageManagerInstaller
from ..shell_utils import read_stdout

# gem package manager key
GEM_INSTALLER = 'gem'


def register_installers(context):
    context.set_installer(GEM_INSTALLER, GemInstaller())


def is_gem_installed():
    try:
        subprocess.Popen(['gem'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        return True
    except OSError:
        return False


def gem_detect(pkgs, exec_fn=None):
    """
    Given a list of package, return the list of installed packages.

    :param exec_fn: function to execute Popen and read stdout (for testing)
    """
    if not is_gem_installed():
        return []

    if exec_fn is None:
        exec_fn = read_stdout
    pkg_list = exec_fn(['gem', 'list']).split('\n')

    ret_list = []
    for pkg in pkg_list:
        pkg_row = pkg.split(' ')
        if pkg_row[0] in pkgs:
            ret_list.append(pkg_row[0])
    return ret_list


class GemInstaller(PackageManagerInstaller):
    """
    :class:`Installer` support for gem.
    """

    def __init__(self):
        super(GemInstaller, self).__init__(gem_detect, supports_depends=True)

    def get_version_strings(self):
        gem_version = subprocess.check_output(['gem', '--version']).strip().decode()
        return ['gem {}'.format(gem_version)]

    def get_install_command(self, resolved, interactive=True, reinstall=False, quiet=False):
        if not is_gem_installed():
            raise InstallFailed((GEM_INSTALLER, 'gem is not installed'))
        packages = self.get_packages_to_install(resolved, reinstall=reinstall)
        if not packages:
            return []
        else:
            return [self.elevate_priv(['gem', 'install', p]) for p in packages]
