#
# -*- 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 iosxr lag_interfaces 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


import re
from copy import deepcopy

from ansible_collections.ansible.netcommon.plugins.module_utils.network.common import (
    utils,
)
from ansible_collections.cisco.iosxr.plugins.module_utils.network.iosxr.argspec.lag_interfaces.lag_interfaces import (
    Lag_interfacesArgs,
)


class Lag_interfacesFacts(object):
    """ The iosxr lag_interfaces fact class
    """

    def __init__(self, module, subspec="config", options="options"):
        self._module = module
        self.argument_spec = Lag_interfacesArgs.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 lag_interfaces
        :param connection: the device connection
        :param ansible_facts: Facts dictionary
        :param data: previously collected conf
        :rtype: dictionary
        :returns: facts
        """

        if not data:
            data = connection.get_config(flags="interface")
        interfaces = ("\n" + data).split("\ninterface ")

        objs = []

        for interface in interfaces:
            if interface.startswith("Bundle-Ether"):
                obj = self.render_config(
                    self.generated_spec, interface, interfaces
                )
                if obj:
                    objs.append(obj)

        ansible_facts["ansible_network_resources"].pop("lag_interfaces", None)
        facts = {}

        facts["lag_interfaces"] = []
        params = utils.validate_config(self.argument_spec, {"config": objs})
        for cfg in params["config"]:
            facts["lag_interfaces"].append(utils.remove_empties(cfg))

        ansible_facts["ansible_network_resources"].update(facts)
        return ansible_facts

    def render_config(self, spec, conf, data):
        """
        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)
        match = re.search(r"(Bundle-Ether)(\d+)", conf, re.M)
        if match:
            config["name"] = match.group(1) + match.group(2)
            config["load_balancing_hash"] = utils.parse_conf_arg(
                conf, "bundle load-balancing hash"
            )
            config["mode"] = utils.parse_conf_arg(conf, "lacp mode")
            config["links"]["max_active"] = utils.parse_conf_arg(
                conf, "bundle maximum-active links"
            )
            config["links"]["min_active"] = utils.parse_conf_arg(
                conf, "bundle minimum-active links"
            )
            config["members"] = self.parse_members(match.group(2), data)

        return utils.remove_empties(config)

    def parse_members(self, bundle_id, interfaces):
        """
        Renders a list of member interfaces for every bundle
        present in running-config.

        :param bundle_id: The Bundle-Ether ID fetched from running-config
        :param interfaces: Data of all interfaces present in running-config
        :rtype: list
        :returns: A list of member interfaces
        """

        def _parse_interface(name):
            if name.startswith("preconfigure"):
                return name.split()[1]
            else:
                return name.split()[0]

        members = []
        for interface in interfaces:
            if not interface.startswith("Bu"):
                match = re.search(
                    r"bundle id (\d+) mode (\S+)", interface, re.M
                )
                if match:
                    if bundle_id == match.group(1):
                        members.append(
                            {
                                "member": _parse_interface(interface),
                                "mode": match.group(2),
                            }
                        )

        return members
