#
# (c) 2019, Ansible by Red Hat, inc
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
#
from __future__ import absolute_import, division, print_function


__metaclass__ = type
import re

from ansible.module_utils.six import iteritems
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import to_list

from ansible_collections.arista.eos.plugins.module_utils.network.eos.providers.providers import (
    CliProvider,
)


class Neighbors(CliProvider):
    def render(self, config=None, nbr_list=None):
        commands = list()
        safe_list = list()
        if not nbr_list:
            nbr_list = self.get_value("config.neighbors")

        for item in nbr_list:
            neighbor_commands = list()
            context = "neighbor %s" % item["neighbor"]
            cmd = "%s remote-as %s" % (context, item["remote_as"])

            if not config or cmd not in config:
                neighbor_commands.append(cmd)

            for key, value in iteritems(item):
                if value is not None:
                    meth = getattr(self, "_render_%s" % key, None)
                    if meth:
                        resp = meth(item, config)
                        if resp:
                            neighbor_commands.extend(to_list(resp))
            commands.extend(neighbor_commands)
            safe_list.append(context)

        if self.params["operation"] == "replace":
            if config and safe_list:
                commands.extend(self._negate_config(config, safe_list))

        return commands

    def _negate_config(self, config, safe_list=None):
        commands = list()
        matches = re.findall(r"(neighbor \S+)", config, re.M)
        for item in set(matches).difference(safe_list):
            commands.append("no %s" % item)
        return commands

    def _render_description(self, item, config=None):
        cmd = "neighbor %s description %s" % (
            item["neighbor"],
            item["description"],
        )
        if not config or cmd not in config:
            return cmd

    def _render_enabled(self, item, config=None):
        cmd = "neighbor %s shutdown" % item["neighbor"]
        if item["enabled"] is True:
            if not config or cmd in config:
                cmd = "no %s" % cmd
                return cmd
        elif not config or cmd not in config:
            return cmd

    def _render_update_source(self, item, config=None):
        cmd = "neighbor %s update-source %s" % (
            item["neighbor"],
            item["update_source"],
        )
        if not config or cmd not in config:
            return cmd

    def _render_password(self, item, config=None):
        cmd = "neighbor %s password %s" % (item["neighbor"], item["password"])
        if not config or cmd not in config:
            return cmd

    def _render_ebgp_multihop(self, item, config=None):
        cmd = "neighbor %s ebgp-multihop %s" % (
            item["neighbor"],
            item["ebgp_multihop"],
        )
        if not config or cmd not in config:
            return cmd

    def _render_peer_group(self, item, config=None):
        cmd = "neighbor %s peer group %s" % (
            item["neighbor"],
            item["peer_group"],
        )
        if not config or cmd not in config:
            return cmd

    def _render_route_reflector_client(self, item, config=None):
        cmd = "neighbor %s route-reflector-client" % item["neighbor"]
        if item["route_reflector_client"] is False:
            if not config or cmd in config:
                cmd = "no %s" % cmd
                return cmd
        elif not config or cmd not in config:
            return cmd

    def _render_maximum_prefix(self, item, config=None):
        cmd = "neighbor %s maximum-routes %s" % (
            item["neighbor"],
            item["maximum_prefix"],
        )
        if not config or cmd not in config:
            return cmd

    def _render_remove_private_as(self, item, config=None):
        cmd = "neighbor %s remove-private-AS" % item["neighbor"]
        if item["remove_private_as"] is False:
            if not config or cmd in config:
                cmd = "no %s" % cmd
                return cmd
        elif not config or cmd not in config:
            return cmd

    def _render_timers(self, item, config):
        """generate bgp timer related configuration"""
        keepalive = item["timers"]["keepalive"]
        holdtime = item["timers"]["holdtime"]
        neighbor = item["neighbor"]

        if keepalive and holdtime:
            cmd = "neighbor %s timers %s %s" % (neighbor, keepalive, holdtime)
            if not config or cmd not in config:
                return cmd


class AFNeighbors(CliProvider):
    def render(self, config=None, nbr_list=None):
        commands = list()
        if not nbr_list:
            return

        for item in nbr_list:
            neighbor_commands = list()
            for key, value in iteritems(item):
                if value is not None:
                    meth = getattr(self, "_render_%s" % key, None)
                    if meth:
                        resp = meth(item, config)
                        if resp:
                            neighbor_commands.extend(to_list(resp))

            commands.extend(neighbor_commands)

        return commands

    def _render_activate(self, item, config=None):
        cmd = "neighbor %s activate" % item["neighbor"]
        if item["activate"] is False:
            if not config or cmd in config:
                cmd = "no %s" % cmd
                return cmd
        elif not config or cmd not in config:
            return cmd

    def _render_default_originate(self, item, config=None):
        cmd = "neighbor %s default-originate" % item["neighbor"]
        if item["default_originate"] is False:
            if not config or cmd in config:
                cmd = "no %s" % cmd
                return cmd
        elif not config or cmd not in config:
            return cmd

    def _render_graceful_restart(self, item, config=None):
        cmd = "neighbor %s graceful-restart" % item["neighbor"]
        if item["graceful_restart"] is False:
            cmd = "no " + cmd
        if config:
            config_el = [x.strip() for x in config.split("\n")]
            if cmd in config_el:
                return
        return cmd

    def _render_weight(self, item, config=None):
        cmd = "neighbor %s weight %s" % (item["neighbor"], item["weight"])
        if not config or cmd not in config:
            return cmd
