#
# -*- 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 static_routes 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.static_routes.static_routes import (
    Static_routesArgs,
)


try:
    from lxml import etree

    HAS_LXML = True
except ImportError:
    HAS_LXML = False
try:
    import xmltodict

    HAS_XMLTODICT = True
except ImportError:
    HAS_XMLTODICT = False


class Static_routesFacts(object):
    """The junos static_routes fact class"""

    def __init__(self, module, subspec="config", options="options"):
        self._module = module
        self.argument_spec = Static_routesArgs.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 static_routes
        :param connection: the device connection
        :param ansible_facts: Facts dictionary
        :param data: previously collected conf
        :rtype: dictionary
        :returns: facts
        """
        if not HAS_LXML:
            self._module.fail_json(msg="lxml is not installed.")
        if not HAS_XMLTODICT:
            self._module.fail_json(msg="xmltodict is not installed.")

        if not data:
            config_filter = """
                <configuration>
                  <routing-instances/>
                  <routing-options/>
                </configuration>
                """
            data = connection.get_configuration(filter=config_filter)

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

        resources = data.xpath("configuration/routing-options")
        vrf_resources = data.xpath("configuration/routing-instances")
        resources.extend(vrf_resources)

        objs = []
        for resource in resources:
            if resource is not None:
                xml = self._get_xml_dict(resource)
                obj = self.render_config(self.generated_spec, xml)
                if obj:
                    objs.append(obj)

        facts = {"static_routes": []}
        if objs:
            params = utils.validate_config(
                self.argument_spec,
                {"config": objs},
            )
            for cfg in params["config"]:
                facts["static_routes"].append(utils.remove_empties(cfg))
        ansible_facts["ansible_network_resources"].update(facts)
        return ansible_facts

    def _get_xml_dict(self, xml_root):
        xml_dict = xmltodict.parse(
            etree.tostring(xml_root),
            dict_constructor=dict,
        )
        return xml_dict

    def _create_route_dict(self, afi, route_path):
        routes_dict = {"afi": afi, "routes": []}
        if isinstance(route_path, dict):
            route_path = [route_path]
        for route in route_path:
            route_dict = {}
            route_dict["dest"] = route["name"]
            if route.get("metric"):
                route_dict["metric"] = route["metric"]["metric-value"]
            route_dict["next_hop"] = []
            route_dict["next_hop"].append(
                {"forward_router_address": route["next-hop"]},
            )
            routes_dict["routes"].append(route_dict)
        return routes_dict

    def render_config(self, spec, conf):
        """
        Render config as dictionary structure and delete keys
          from spec for null values

        :param spec: The facts tree, generated from the argspec
        :param conf: The configuration
        :rtype: dictionary
        :returns: The generated config
        """
        config = deepcopy(spec)
        routes = []
        config["address_families"] = []

        if conf.get("routing-options"):
            if conf["routing-options"].get("rib"):
                if conf["routing-options"].get("rib").get("name") == "inet6.0":
                    if conf["routing-options"].get("rib").get("static"):
                        route_path = conf["routing-options"]["rib"]["static"].get("route")
                        routes.append(
                            self._create_route_dict("ipv6", route_path),
                        )
            if conf["routing-options"].get("static"):
                route_path = conf["routing-options"]["static"].get("route")
                routes.append(self._create_route_dict("ipv4", route_path))

        if conf.get("routing-instances"):
            config["vrf"] = conf["routing-instances"]["instance"]["name"]
            if (
                conf["routing-instances"]
                .get("instance")
                .get("routing-options")
                .get("rib")
                .get("name")
                == config["vrf"] + ".inet6.0"
            ):
                if conf["routing-instances"]["instance"]["routing-options"]["rib"].get("static"):
                    route_path = conf["routing-instances"]["instance"]["routing-options"]["rib"][
                        "static"
                    ].get("route")
                    routes.append(self._create_route_dict("ipv6", route_path))
            if conf["routing-instances"].get("instance").get("routing-options").get("static"):
                route_path = conf["routing-instances"]["instance"]["routing-options"]["static"].get(
                    "route",
                )
                routes.append(self._create_route_dict("ipv4", route_path))
        config["address_families"].extend(routes)
        return utils.remove_empties(config)
