#    Copyright (C) 2017 SUSE LLC
#    Copyright (C) 2013 Hewlett-Packard Development Company, L.P.
#
#    Author: Robert Schweikert <rjschwei@suse.com>
#    Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
#    Leaning very heavily on the RHEL and Debian implementation
#
# This file is part of cloud-init. See LICENSE file for license information.

from cloudinit import distros

from cloudinit.distros.parsers.hostname import HostnameConf

from cloudinit import helpers
from cloudinit import subp
from cloudinit import util

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


class Distro(distros.Distro):
    clock_conf_fn = '/etc/sysconfig/clock'
    hostname_conf_fn = '/etc/HOSTNAME'
    init_cmd = ['service']
    locale_conf_fn = '/etc/sysconfig/language'
    network_conf_fn = '/etc/sysconfig/network/config'
    network_script_tpl = '/etc/sysconfig/network/ifcfg-%s'
    route_conf_tpl = '/etc/sysconfig/network/ifroute-%s'
    systemd_hostname_conf_fn = '/etc/hostname'
    systemd_locale_conf_fn = '/etc/locale.conf'
    tz_local_fn = '/etc/localtime'
    renderer_configs = {
        'sysconfig': {
            'control': 'etc/sysconfig/network/config',
            'flavor': 'suse',
            'iface_templates': '%(base)s/network/ifcfg-%(name)s',
            'netrules_path': (
                'etc/udev/rules.d/85-persistent-net-cloud-init.rules'),
            'route_templates': {
                'ipv4': '%(base)s/network/ifroute-%(name)s',
                'ipv6': '%(base)s/network/ifroute-%(name)s',
            }
        }
    }

    def __init__(self, name, cfg, paths):
        distros.Distro.__init__(self, name, cfg, paths)
        self._runner = helpers.Runners(paths)
        self.osfamily = 'suse'
        cfg['ssh_svcname'] = 'sshd'
        if self.uses_systemd():
            self.init_cmd = ['systemctl']
            cfg['ssh_svcname'] = 'sshd.service'

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

    def install_packages(self, pkglist):
        self.package_command(
            'install',
            args='--auto-agree-with-licenses',
            pkgs=pkglist
        )

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

        # No user interaction possible, enable non-interactive mode
        cmd = ['zypper', '--non-interactive']

        # Command is the operation, such as install
        if command == 'upgrade':
            command = 'update'
        cmd.append(command)

        # args are the arguments to the command, not global options
        if args and isinstance(args, str):
            cmd.append(args)
        elif args and isinstance(args, list):
            cmd.extend(args)

        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 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 = {
                'TIMEZONE': str(tz),
            }
            rhutil.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 update_package_sources(self):
        self._runner.run("update-sources", self.package_command,
                         ['refresh'], freq=PER_INSTANCE)

    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:
            try:
                conf = self._read_hostname_conf(filename)
                hostname = conf.hostname
            except IOError:
                pass
            if not hostname:
                return default
            return hostname

    def _get_localhost_ip(self):
        return "127.0.1.1"

    def _read_hostname_conf(self, filename):
        conf = HostnameConf(util.load_file(filename))
        conf.parse()
        return conf

    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 _write_hostname(self, hostname, filename):
        if self.uses_systemd() and filename.endswith('/previous-hostname'):
            util.write_file(filename, hostname)
        elif self.uses_systemd():
            subp.subp(['hostnamectl', 'set-hostname', str(hostname)])
        else:
            conf = None
            try:
                # Try to update the previous one
                # so lets see if we can read it first.
                conf = self._read_hostname_conf(filename)
            except IOError:
                pass
            if not conf:
                conf = HostnameConf('')
            conf.set_hostname(hostname)
            util.write_file(filename, str(conf), 0o644)

    @property
    def preferred_ntp_clients(self):
        """The preferred ntp client is dependent on the version."""

        # Allow distro to determine the preferred ntp client list
        if not self._preferred_ntp_clients:
            distro_info = util.system_info()['dist']
            name = distro_info[0]
            major_ver = int(distro_info[1].split('.')[0])

            # This is horribly complicated because of a case of
            # "we do not care if versions should be increasing syndrome"
            if (
                (major_ver >= 15 and 'openSUSE' not in name) or
                (major_ver >= 15 and 'openSUSE' in name and major_ver != 42)
            ):
                self._preferred_ntp_clients = ['chrony',
                                               'systemd-timesyncd', 'ntp']
            else:
                self._preferred_ntp_clients = ['ntp',
                                               'systemd-timesyncd', 'chrony']

        return self._preferred_ntp_clients

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