#
# -*- coding: utf-8 -*-
# Copyright 2019 Red Hat
# GNU General Public License v3.0+
# (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
"""
The junos lacp fact class
It is in this file the configuration is collected from the device
for a given resource, parsed, and the facts tree is populated
based on the configuration.
"""
from __future__ import absolute_import, division, print_function


__metaclass__ = type

from copy import deepcopy

from ansible.module_utils._text import to_bytes
from ansible.module_utils.six import string_types
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common import utils

from ansible_collections.junipernetworks.junos.plugins.module_utils.network.junos.argspec.lacp.lacp import (
    LacpArgs,
)
from ansible_collections.junipernetworks.junos.plugins.module_utils.network.junos.utils.utils import (
    get_resource_config,
)


try:
    from lxml import etree

    HAS_LXML = True
except ImportError:
    HAS_LXML = False


class LacpFacts(object):
    """The junos lacp fact class"""

    def __init__(self, module, subspec="config", options="options"):
        self._module = module
        self.argument_spec = LacpArgs.argument_spec
        spec = deepcopy(self.argument_spec)
        if subspec:
            if options:
                facts_argument_spec = spec[subspec][options]
            else:
                facts_argument_spec = spec[subspec]
        else:
            facts_argument_spec = spec

        self.generated_spec = utils.generate_dict(facts_argument_spec)

    def populate_facts(self, connection, ansible_facts, data=None):
        """Populate the facts for interfaces
        :param connection: the device connection
        :param data: previously collected configuration as lxml ElementTree root instance
                     or valid xml sting
        :rtype: dictionary
        :returns: facts
        """
        if not HAS_LXML:
            self._module.fail_json(msg="lxml is not installed.")

        if not data:
            config_filter = """
                <configuration>
                    <chassis>
                        <aggregated-devices>
                            <ethernet>
                                <lacp>
                                </lacp>
                            </ethernet>
                        </aggregated-devices>
                    </chassis>
                </configuration>
                """
            data = get_resource_config(connection, config_filter=config_filter)

        if isinstance(data, string_types):
            data = etree.fromstring(
                to_bytes(data, errors="surrogate_then_replace"),
            )

        facts = {}
        config = deepcopy(self.generated_spec)
        resources = data.xpath(
            "configuration/chassis/aggregated-devices/ethernet/lacp",
        )
        if resources:
            lacp_root = resources[0]
            config["system_priority"] = utils.get_xml_conf_arg(
                lacp_root,
                "system-priority",
            )

            if utils.get_xml_conf_arg(
                lacp_root,
                "link-protection/non-revertive",
                data="tag",
            ):
                config["link_protection"] = "non-revertive"

            elif utils.get_xml_conf_arg(lacp_root, "link-protection"):
                config["link_protection"] = "revertive"

        params = utils.validate_config(
            self.argument_spec,
            {"config": utils.remove_empties(config)},
        )
        facts["lacp"] = {}
        facts["lacp"].update(utils.remove_empties(params["config"]))

        ansible_facts["ansible_network_resources"].update(facts)

        return ansible_facts
