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# -*- coding: utf-8 -*-

from __future__ import print_function, division, absolute_import
#
# Copyright (c) 2018 Red Hat, Inc.
#
# This software is licensed to you under the GNU General Public License,
# version 2 (GPLv2). There is NO WARRANTY for this software, express or
# implied, including the implied warranties of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
# along with this software; if not, see
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
#
# Red Hat trademarks are not licensed under GPLv2. No permission is
# granted to use or replicate Red Hat trademarks that are incorporated
# in this software or its documentation.

import argparse
import os
import sys
import six

from syspurpose.files import SyncedStore
from syspurpose.utils import in_container, make_utf8
from syspurpose.i18n import ugettext as _
import json

SP_CONFLICT_MESSAGE = _("Warning: A {attr} of \"{download_value}\" was recently set for this system "
                        "by the entitlement server administrator.\n{advice}")
SP_ADVICE = _("If you'd like to overwrite the server side change please run: {command}")

def add_command(args, syspurposestore):
    """
    Uses the syspurposestore to add one or more values to a particular property.
    :param args: The parsed args from argparse, expected attributes are:
        prop_name: the string name of the property to add to
        values: A list of the values to add to the given property (could be anything json-serializable)
    :param syspurposestore: An SyspurposeStore object to manipulate
    :return: None
    """
    any_prop_added = False
    for value in args.values:
        if syspurposestore.add(args.prop_name, value):
            any_prop_added = True
            print(_("Added \"{value}\" to {prop_name}.").format(
                value=make_utf8(value), prop_name=make_utf8(args.prop_name)))
        else:
            print(_("Not adding value \"{value}\" to {prop_name}; it already exists.").format(
                value=make_utf8(value), prop_name=make_utf8(args.prop_name)))

if any_prop_added is False:
        return

success_msg = _("{attr} updated.").format(attr=make_utf8(args.prop_name))
    to_add = "".join(args.values)
    command = "syspurpose add-{name} ".format(name=args.prop_name) + to_add
    check_result(
        syspurposestore,
        expectation=lambda res: all(x in res.get(args.prop_name, []) for x in args.values),
        success_msg=success_msg,
        command=command,
        attr=args.prop_name
    )

def remove_command(args, syspurposestore):
    """
    Uses the syspurposestore to remove one or more values from a particular property.
    :param args: The parsed args from argparse, expected attributes are:
        prop_name: the string name of the property to add to
        values: A list of the values to remove from the given property (could be anything json-serializable)
    :param syspurposestore: An SyspurposeStore object to manipulate
    :return: None
    """
    for value in args.values:
        if syspurposestore.remove(args.prop_name, value):
            print(_("Removed \"{val}\" from {name}.").format(val=make_utf8(value), name=make_utf8(args.prop_name)))
        else:
            print(_("Not removing value \"{val}\" from {name}; it was not there.").format(
                val=make_utf8(value), name=make_utf8(args.prop_name)))
            return

success_msg = _("{attr} updated.").format(attr=make_utf8(args.prop_name))
    to_remove = "".join(args.values)
    command = "syspurpose remove-{name} ".format(name=args.prop_name) + to_remove
    check_result(
        syspurposestore,
        expectation=lambda res: all(x not in res.get('addons', []) for x in args.values),
        success_msg=success_msg,
        command=command,
        attr=args.prop_name
    )

def set_command(args, syspurposestore):
    """
    Uses the syspurposestore to set the prop_name to value.
    :param args: The parsed args from argparse, expected attributes are:
        prop_name: the string name of the property to set
        value: An object to set the property to (could be anything json-serializable)
    :param syspurposestore: An SyspurposeStore object to manipulate
    :return: None
    """
    syspurposestore.set(args.prop_name, args.value)

success_msg = _("{attr} set to \"{val}\".").format(attr=make_utf8(args.prop_name), val=make_utf8(args.value))
    check_result(
        syspurposestore,
        expectation=lambda res: res.get(args.prop_name) == args.value,
        success_msg=success_msg,
        command="syspurpose set {name} \"{val}\"".format(
            name=args.prop_name, val=args.value),
        attr=args.prop_name
    )

def unset_command(args, syspurposestore):
    """
    Uses the syspurposestore to unset (clear entirely) the prop_name.
    :param args: The parsed args from argparse, expected attributes are:
        prop_name: the string name of the property to unset (clear)
    :param syspurposestore: An SyspurposeStore object to manipulate
    :return: None
    """
    syspurposestore.unset(args.prop_name)

success_msg = _("{attr} unset.").format(attr=make_utf8(args.prop_name))
    check_result(
        syspurposestore,
        expectation=lambda res: res.get(args.prop_name) in ["", None, []],
        success_msg=success_msg,
        command="syspurpose unset {name}".format(name=args.prop_name),
        attr=args.prop_name
    )

def show_contents(args, syspurposestore):
    """
    :param args:
    :param syspurposestore:
    :return:
    """
    sync_result = syspurposestore.sync()
    contents = sync_result.result
    contents = {key: contents[key] for key in contents if contents[key]}
    print(json.dumps(contents, indent=2, ensure_ascii=False, sort_keys=True))
    return sync_result

def setup_arg_parser():
    """
    Sets up argument parsing for the syspurpose tool.
    :return: An argparse.ArgumentParser ready to use to parse_args
    """
    parser = argparse.ArgumentParser(prog="syspurpose", description=_("System Syspurpose Management Tool"),
                                     epilog=_("The 'syspurpose' command is deprecated and will be removed in a future major release."
                                                " Please use the 'subscription-manager syspurpose' command going forward."))

subparsers = parser.add_subparsers(help="sub-command help")

# Arguments shared by subcommands
    add_options = argparse.ArgumentParser(add_help=False)
    add_options.add_argument("values", help=_("The value(s) to add"), nargs='+')
    add_options.set_defaults(func=add_command, requires_sync=True)

remove_options = argparse.ArgumentParser(add_help=False)
    remove_options.add_argument("values", help=_("The value(s) to remove"), nargs='+')
    remove_options.set_defaults(func=remove_command, requires_sync=True)

set_options = argparse.ArgumentParser(add_help=False)
    set_options.add_argument("value", help=_("The value to set"), action="store")
    set_options.set_defaults(func=set_command, requires_sync=True)

unset_options = argparse.ArgumentParser(add_help=False)
    unset_options.set_defaults(func=unset_command, requires_sync=True)

# Generic assignments
    # Set ################
    generic_set_parser = subparsers.add_parser(
        "set",
        help=_("Sets the value for the given property")
    )

generic_set_parser.add_argument(
        "prop_name",
        metavar="property",
        help=_("The name of the property to set/update"),
        action="store"
    )

generic_set_parser.add_argument(
        "value",
        help=_("The value to set"),
        action="store"
    )

generic_set_parser.set_defaults(func=set_command, requires_sync=True)

# Unset ##############
    generic_unset_parser = subparsers.add_parser(
        "unset",
        help=_("Unsets (clears) the value for the given property"),
        parents=[unset_options]
    )

generic_unset_parser.add_argument(
        "prop_name",
        metavar="property",
        help=_("The name of the property to set/update"),
        action="store"
    )

# Add ################
    generic_add_parser = subparsers.add_parser(
        "add",
        help=_("Adds the value(s) to the given property")
    )

generic_add_parser.add_argument(
        "prop_name",
        metavar="property",
        help=_("The name of the property to update"),
        action="store"
    )

generic_add_parser.add_argument(
        "values",
        help=_("The value(s) to add"),
        action="store",
        nargs="+"
    )

generic_add_parser.set_defaults(func=add_command, requires_sync=True)

# Remove #############
    generic_remove_parser = subparsers.add_parser(
        "remove",
        help=_("Removes the value(s) from the given property")
    )

generic_remove_parser.add_argument(
        "prop_name",
        metavar="property",
        help=_("The name of the property to update"),
        action="store"
    )

generic_remove_parser.add_argument(
        "values",
        help=_("The value(s) to remove"),
        action="store",
        nargs="+"
    )

generic_remove_parser.set_defaults(func=remove_command, requires_sync=True)
    # Targeted commands
    # Roles ##########
    set_role_parser = subparsers.add_parser(
        "set-role",
        help=_("Set the system role to the system syspurpose"),
        parents=[set_options]
    )
    # TODO: Set prop_name from schema file
    set_role_parser.set_defaults(prop_name="role")

unset_role_parser = subparsers.add_parser(
        "unset-role",
        help=_("Clear set role"),
        parents=[unset_options]
    )
    unset_role_parser.set_defaults(prop_name="role")

# ADDONS #############
    add_addons_parser = subparsers.add_parser(
        "add-addons",
        help=_("Add addons to the system syspurpose"),
        parents=[add_options]
    )
    # TODO: Set prop_name from schema file
    add_addons_parser.set_defaults(prop_name="addons")

remove_addons_parser = subparsers.add_parser(
        "remove-addons",
        help=_("Remove addons from the system syspurpose"),
        parents=[remove_options]
    )
    remove_addons_parser.set_defaults(prop_name="addons")

unset_role_parser = subparsers.add_parser(
        "unset-addons",
        help=_("Clear set addons"),
        parents=[unset_options]
    )
    unset_role_parser.set_defaults(prop_name="addons")

# SLA ################
    set_sla_parser = subparsers.add_parser(
        "set-sla",
        help=_("Set the system sla"),
        parents=[set_options]
    )
    set_sla_parser.set_defaults(prop_name="service_level_agreement")

unset_sla_parser = subparsers.add_parser(
        "unset-sla",
        help=_("Clear set sla"),
        parents=[unset_options]
    )
    unset_sla_parser.set_defaults(prop_name="service_level_agreement")

# USAGE ##############
    set_usage_parser = subparsers.add_parser(
        "set-usage",
        help=_("Set the system usage"),
        parents=[set_options]
    )

set_usage_parser.set_defaults(prop_name="usage")

unset_usage_parser = subparsers.add_parser(
        "unset-usage",
        help=_("Clear set usage"),
        parents=[unset_options]
    )
    unset_usage_parser.set_defaults(prop_name="usage")

# Pretty Print Json contents of default syspurpose file
    show_parser = subparsers.add_parser(
        "show",
        help=_("Show the current system syspurpose")
    )
    show_parser.set_defaults(func=show_contents, requires_sync=False)

return parser

def main():
    """
    Run the cli (Do the syspurpose tool thing!!)
    :return: 0
    """

parser = setup_arg_parser()
    args = parser.parse_args()

# Syspurpose is not intended to be used in containers for the time being (could change later).
    if in_container():
        print(_("WARNING: Setting syspurpose in containers has no effect.\n"
              "Please run syspurpose on the host.\n"))

print(_("The 'syspurpose' command is deprecated and will be removed in a future major release."
        " Please use the 'subscription-manager syspurpose' command going forward."), file=sys.stderr)
    try:
        from subscription_manager.identity import Identity
        from subscription_manager.cp_provider import CPProvider
        identity = Identity()
        uuid = identity.uuid
        uep = CPProvider().get_consumer_auth_cp()
    except ImportError:
        uuid = None
        uep = None
        print(_("Warning: Unable to sync system purpose with subscription management server:"
                " subscription_manager module is not available."))

syspurposestore = SyncedStore(uep=uep, consumer_uuid=uuid, use_valid_fields=True)
    if getattr(args, 'func', None) is not None:
        args.func(args, syspurposestore)
    else:
        parser.print_help()
        return 0

return 0

def system_exit(code, msgs=None):
    """
    Exit with a code and optional message(s). Saved a few lines of code.
    Note: this method was copied from subscription_manager, because syspurpose should be independent
    on subscription_manager module as much as possible.
    """

if msgs:
        if type(msgs) not in [type([]), type(())]:
            msgs = (msgs, )
        for msg in msgs:
            if isinstance(msg, Exception):
                msg = "%s" % msg

if isinstance(msg, six.text_type) and six.PY2:
                sys.stderr.write(msg.encode("utf8"))
                sys.stderr.write("\n")
            else:
                sys.stderr.write(msg)
                sys.stderr.write("\n")

try:
        sys.stdout.flush()
        sys.stderr.flush()
    except IOError:
        pass

sys.exit(code)

def check_result(syspurposestore, expectation, success_msg, command, attr):
    if syspurposestore:
        syspurposestore.sync()
        result = syspurposestore.get_cached_contents()
    else:
        result = {}
    if result and not expectation(result):
        advice = SP_ADVICE.format(command=command)
        value = result[attr]
        system_exit(
            os.EX_SOFTWARE,
            msgs=_(SP_CONFLICT_MESSAGE.format(
                attr=attr,
                download_value=value,
                advice=advice
            ))
        )
    else:
        print(success_msg)