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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

from cloudinit import distros
from cloudinit import helpers
from cloudinit import log as logging
from cloudinit import subp
from cloudinit import util

from cloudinit.distros import rhel_util
from cloudinit.settings import PER_INSTANCE

LOG = logging.getLogger(__name__)


def _make_sysconfig_bool(val):
    if val:
        return 'yes'
    else:
        return 'no'


class Distro(distros.Distro):
    # See: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Network_Configuration_Using_sysconfig_Files.html # noqa
    clock_conf_fn = "/etc/sysconfig/clock"
    locale_conf_fn = '/etc/sysconfig/i18n'
    systemd_locale_conf_fn = '/etc/locale.conf'
    network_conf_fn = "/etc/sysconfig/network"
    hostname_conf_fn = "/etc/sysconfig/network"
    systemd_hostname_conf_fn = "/etc/hostname"
    network_script_tpl = '/etc/sysconfig/network-scripts/ifcfg-%s'
    resolve_conf_fn = "/etc/resolv.conf"
    tz_local_fn = "/etc/localtime"
    usr_lib_exec = "/usr/libexec"
    renderer_configs = {
        'sysconfig': {
            'control': 'etc/sysconfig/network',
            'iface_templates': '%(base)s/network-scripts/ifcfg-%(name)s',
            'route_templates': {
                'ipv4': '%(base)s/network-scripts/route-%(name)s',
                'ipv6': '%(base)s/network-scripts/route6-%(name)s'
            }
        }
    }

    def __init__(self, name, cfg, paths):
        distros.Distro.__init__(self, name, cfg, paths)
        # This will be used to restrict certain
        # calls from repeatly happening (when they
        # should only happen say once per instance...)
        self._runner = helpers.Runners(paths)
        self.osfamily = 'redhat'
        cfg['ssh_svcname'] = 'sshd'

    def install_packages(self, pkglist):
        self.package_command('install', pkgs=pkglist)

    def _write_network_config(self, netconfig):
        return self._supported_write_network_config(netconfig)

    def apply_locale(self, locale, out_fn=None):
        if self.uses_systemd():
            if not out_fn:
                out_fn = self.systemd_locale_conf_fn
            out_fn = self.systemd_locale_conf_fn
        else:
            if not out_fn:
                out_fn = self.locale_conf_fn
        locale_cfg = {
            'LANG': locale,
        }
        rhel_util.update_sysconfig_file(out_fn, locale_cfg)

    def _write_hostname(self, hostname, out_fn):
        # systemd will never update previous-hostname for us, so
        # we need to do it ourselves
        if self.uses_systemd() and out_fn.endswith('/previous-hostname'):
            util.write_file(out_fn, hostname)
        elif self.uses_systemd():
            subp.subp(['hostnamectl', 'set-hostname', str(hostname)])
        else:
            host_cfg = {
                'HOSTNAME': hostname,
            }
            rhel_util.update_sysconfig_file(out_fn, host_cfg)

    def _select_hostname(self, hostname, fqdn):
        # Should be fqdn if we can use it
        # See: https://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-sysconfig.html#s2-sysconfig-network # noqa
        if fqdn:
            return fqdn
        return hostname

    def _read_system_hostname(self):
        if self.uses_systemd():
            host_fn = self.systemd_hostname_conf_fn
        else:
            host_fn = self.hostname_conf_fn
        return (host_fn, self._read_hostname(host_fn))

    def _read_hostname(self, filename, default=None):
        if self.uses_systemd() and filename.endswith('/previous-hostname'):
            return util.load_file(filename).strip()
        elif self.uses_systemd():
            (out, _err) = subp.subp(['hostname'])
            if len(out):
                return out
            else:
                return default
        else:
            (_exists, contents) = rhel_util.read_sysconfig_file(filename)
            if 'HOSTNAME' in contents:
                return contents['HOSTNAME']
            else:
                return default

    def _bring_up_interfaces(self, device_names):
        if device_names and 'all' in device_names:
            raise RuntimeError(('Distro %s can not translate '
                                'the device name "all"') % (self.name))
        return distros.Distro._bring_up_interfaces(self, device_names)

    def set_timezone(self, tz):
        tz_file = self._find_tz_file(tz)
        if self.uses_systemd():
            # Currently, timedatectl complains if invoked during startup
            # so for compatibility, create the link manually.
            util.del_file(self.tz_local_fn)
            util.sym_link(tz_file, self.tz_local_fn)
        else:
            # Adjust the sysconfig clock zone setting
            clock_cfg = {
                'ZONE': str(tz),
            }
            rhel_util.update_sysconfig_file(self.clock_conf_fn, clock_cfg)
            # This ensures that the correct tz will be used for the system
            util.copy(tz_file, self.tz_local_fn)

    def package_command(self, command, args=None, pkgs=None):
        if pkgs is None:
            pkgs = []

        if subp.which('dnf'):
            LOG.debug('Using DNF for package management')
            cmd = ['dnf']
        else:
            LOG.debug('Using YUM for package management')
            # the '-t' argument makes yum tolerant of errors on the command
            # line with regard to packages.
            #
            # For example: if you request to install foo, bar and baz and baz
            # is installed; yum won't error out complaining that baz is already
            # installed.
            cmd = ['yum', '-t']
        # Determines whether or not yum prompts for confirmation
        # of critical actions. We don't want to prompt...
        cmd.append("-y")

        if args and isinstance(args, str):
            cmd.append(args)
        elif args and isinstance(args, list):
            cmd.extend(args)

        cmd.append(command)

        pkglist = util.expand_package_list('%s-%s', pkgs)
        cmd.extend(pkglist)

        # Allow the output of this to flow outwards (ie not be captured)
        subp.subp(cmd, capture=False)

    def update_package_sources(self):
        self._runner.run("update-sources", self.package_command,
                         ["makecache"], freq=PER_INSTANCE)

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