#
# (c) 2018 Red Hat Inc.
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import absolute_import, division, print_function


__metaclass__ = type

DOCUMENTATION = """
---
author: Ansible Networking Team (@ansible-network)
name: frr
short_description: Use frr cliconf to run command on Free Range Routing platform
description:
  - This frr plugin provides low level abstraction apis for
    sending and receiving CLI commands from FRR network devices.
version_added: "1.0.0"
"""

import json
import re

from ansible.errors import AnsibleConnectionFailure
from ansible.module_utils._text import to_text
from ansible.module_utils.common._collections_compat import Mapping
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.config import (
    NetworkConfig,
    dumps,
)
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import to_list
from ansible_collections.ansible.netcommon.plugins.plugin_utils.cliconf_base import (
    CliconfBase,
    enable_mode,
)


class Cliconf(CliconfBase):
    def get_supported_protocols(self):
        supported_protocols = {}
        protocols = [
            "bgp",
            "isis",
            "ospf",
            "ldp",
            "ospf6",
            "pim",
            "rip",
            "ripm",
            "zebra",
        ]
        daemons = self.get("show daemons")
        data = to_text(daemons, errors="surrogate_or_strict").strip()

        for item in protocols:
            supported_protocols[item] = True if item in data else False
        return supported_protocols

    def get_device_info(self):
        device_info = {}

        device_info["network_os"] = "frr"
        reply = self.get("show version")
        data = to_text(reply, errors="surrogate_or_strict").strip()

        match = re.search(r"FRRouting (\S+) \((\S+)\)", data)
        if match:
            device_info["network_os_version"] = match.group(1)
            if match.group(2):
                device_info["network_os_hostname"] = match.group(2)

        return device_info

    def get_option_values(self):
        return {
            "format": ["text"],
            "diff_match": ["line", "strict", "exact", "none"],
            "diff_replace": ["line", "block"],
            "output": [],
        }

    def get_device_operations(self):
        return {
            "supports_diff_replace": False,
            "supports_commit": False,
            "supports_rollback": False,
            "supports_defaults": False,
            "supports_onbox_diff": False,
            "supports_commit_comment": False,
            "supports_multiline_delimiter": False,
            "supports_diff_match": False,
            "supports_diff_ignore_lines": False,
            "supports_generate_diff": True,
            "supports_replace": False,
        }

    def get_capabilities(self):
        result = super(Cliconf, self).get_capabilities()
        result["rpc"] += ["get_diff", "run_commands"]
        result["device_operations"] = self.get_device_operations()
        result["supported_protocols"] = self.get_supported_protocols()
        result.update(self.get_option_values())
        return json.dumps(result)

    def get_diff(
        self,
        candidate=None,
        running=None,
        diff_match="line",
        diff_ignore_lines=None,
        path=None,
        diff_replace="line",
    ):
        diff = {}
        device_operations = self.get_device_operations()
        option_values = self.get_option_values()

        if candidate is None and device_operations["supports_generate_diff"]:
            raise ValueError("candidate configuration is required to generate diff")

        if diff_match not in option_values["diff_match"]:
            raise ValueError(
                "'match' value %s in invalid, valid values are %s"
                % (diff_match, ", ".join(option_values["diff_match"])),
            )

        if diff_replace not in option_values["diff_replace"]:
            raise ValueError(
                "'replace' value %s in invalid, valid values are %s"
                % (diff_replace, ", ".join(option_values["diff_replace"])),
            )

        # prepare candidate configuration
        candidate_obj = NetworkConfig(indent=1)
        candidate_obj.load(candidate)

        if running and diff_match != "none":
            # running configuration
            running_obj = NetworkConfig(indent=1, contents=running, ignore_lines=diff_ignore_lines)
            configdiffobjs = candidate_obj.difference(
                running_obj,
                path=path,
                match=diff_match,
                replace=diff_replace,
            )

        else:
            configdiffobjs = candidate_obj.items

        diff["config_diff"] = dumps(configdiffobjs, "commands") if configdiffobjs else ""
        return diff

    @enable_mode
    def get_config(self, source="running", flags=None, format=None):
        if source not in ("running", "startup"):
            raise ValueError("fetching configuration from %s is not supported" % source)

        if format:
            raise ValueError("'format' value %s is not supported for get_config" % format)

        if not flags:
            flags = []
        if source == "running":
            cmd = "show running-config "
        else:
            cmd = "show startup-config "

        cmd += " ".join(to_list(flags))
        cmd = cmd.strip()

        return self.send_command(cmd)

    @enable_mode
    def edit_config(self, candidate=None, commit=True, replace=None, comment=None):
        resp = {}
        operations = self.get_device_operations()
        self.check_edit_config_capability(operations, candidate, commit, replace, comment)

        results = []
        requests = []
        if commit:
            self.send_command("configure terminal")
            for line in to_list(candidate):
                if not isinstance(line, Mapping):
                    line = {"command": line}

                cmd = line["command"]
                if cmd != "end" and cmd[0] != "!":
                    results.append(self.send_command(**line))
                    requests.append(cmd)

            self.send_command("end")
        else:
            raise ValueError("check mode is not supported")

        resp["request"] = requests
        resp["response"] = results
        return resp

    def get(
        self,
        command=None,
        prompt=None,
        answer=None,
        sendonly=False,
        newline=True,
        output=None,
        check_all=False,
    ):
        if not command:
            raise ValueError("must provide value of command to execute")
        if output:
            raise ValueError("'output' value %s is not supported for get" % output)

        return self.send_command(
            command=command,
            prompt=prompt,
            answer=answer,
            sendonly=sendonly,
            newline=newline,
            check_all=check_all,
        )

    def run_commands(self, commands=None, check_rc=True):
        if commands is None:
            raise ValueError("'commands' value is required")

        responses = list()
        for cmd in to_list(commands):
            if not isinstance(cmd, Mapping):
                cmd = {"command": cmd}

            output = cmd.pop("output", None)
            if output:
                raise ValueError("'output' value %s is not supported for run_commands" % output)

            try:
                out = self.send_command(**cmd)
            except AnsibleConnectionFailure as e:
                if check_rc:
                    raise
                out = getattr(e, "err", to_text(e))

            responses.append(out)

        return responses
