#
# (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.cli.config.bgp.neighbors import (
    AFNeighbors,
)
from ansible_collections.arista.eos.plugins.module_utils.network.eos.providers.providers import (
    CliProvider,
)


class AddressFamily(CliProvider):
    def render(self, config=None):
        commands = list()
        safe_list = list()

        router_context = "router bgp %s" % self.get_value("config.bgp_as")
        context_config = None

        for item in self.get_value("config.address_family"):
            context = "address-family %s" % item["afi"]
            context_commands = list()

            if config:
                context_path = [router_context, context]
                context_config = self.get_config_context(
                    config,
                    context_path,
                    indent=2,
                )

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

            if context_commands:
                commands.append(context)
                commands.extend(context_commands)
                commands.append("exit")

            safe_list.append(context)

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

        return commands

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

    def _render_auto_summary(self, item, config=None):
        cmd = "auto-summary"
        if item["auto_summary"] is False:
            cmd = "no %s" % cmd
        if not config or cmd not in config:
            return cmd

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

    def _render_networks(self, item, config=None):
        commands = list()
        safe_list = list()

        for entry in item["networks"]:
            network = entry["prefix"]
            if entry["masklen"]:
                network = "%s/%s" % (entry["prefix"], entry["masklen"])
            safe_list.append(network)

            cmd = "network %s" % network

            if entry["route_map"]:
                cmd += " route-map %s" % entry["route_map"]

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

        if self.params["operation"] == "replace":
            if config:
                matches = re.findall(r"network (\S+)", config, re.M)
                for entry in set(matches).difference(safe_list):
                    commands.append("no network %s" % entry)

        return commands

    def _render_redistribute(self, item, config=None):
        commands = list()
        safe_list = list()

        for entry in item["redistribute"]:
            option = entry["protocol"]

            cmd = "redistribute %s" % entry["protocol"]

            if entry["route_map"]:
                cmd += " route-map %s" % entry["route_map"]

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

            safe_list.append(option)

        if self.params["operation"] == "replace":
            if config:
                matches = re.findall(
                    r"redistribute (\S+)(?:\s*)(\d*)",
                    config,
                    re.M,
                )
                for i in range(0, len(matches)):
                    matches[i] = " ".join(matches[i]).strip()
                for entry in set(matches).difference(safe_list):
                    commands.append("no redistribute %s" % entry)

        return commands

    def _render_neighbors(self, item, config):
        """generate bgp neighbor configuration"""
        return AFNeighbors(self.params).render(
            config,
            nbr_list=item["neighbors"],
        )
