# -*- 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 legacy 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 platform
import re

from ansible.module_utils.six import iteritems
from ansible.module_utils.six.moves import zip

from ansible_collections.cisco.iosxr.plugins.module_utils.network.iosxr.iosxr import (
    get_capabilities,
    run_commands,
)


class FactsBase(object):
    COMMANDS = frozenset()

    def __init__(self, module):
        self.module = module
        self.facts = dict()
        self.warnings = list()
        self.responses = None

    def populate(self):
        self.responses = run_commands(
            self.module,
            list(self.COMMANDS),
            check_rc=False,
        )


class Default(FactsBase):
    def populate(self):
        self.facts.update(self.platform_facts())

    def platform_facts(self):
        platform_facts = {}

        resp = get_capabilities(self.module)
        device_info = resp["device_info"]

        platform_facts["system"] = device_info["network_os"]
        for item in ("serialnum", "model", "image", "version", "platform", "hostname"):
            val = device_info.get("network_os_%s" % item)
            if val:
                platform_facts[item] = val

        platform_facts["api"] = resp["network_api"]
        platform_facts["python_version"] = platform.python_version()

        return platform_facts


class Hardware(FactsBase):
    COMMANDS = ["dir /all", "show memory summary"]

    def populate(self):
        super(Hardware, self).populate()
        data = self.responses[0]
        self.facts["filesystems"] = self.parse_filesystems(data)

        data = self.responses[1]
        match = re.search(r"Physical Memory: (\d+)M total \((\d+)", data)
        if match:
            self.facts["memtotal_mb"] = match.group(1)
            self.facts["memfree_mb"] = match.group(2)

    def parse_filesystems(self, data):
        return re.findall(r"^Directory of (\S+)", data, re.M)


class Config(FactsBase):
    COMMANDS = ["show running-config"]

    def populate(self):
        super(Config, self).populate()
        self.facts["config"] = self.responses[0]


class Interfaces(FactsBase):
    COMMANDS = [
        "show interfaces",
        "show ipv6 interface",
        "show lldp",
        "show lldp neighbors detail",
    ]

    def populate(self):
        super(Interfaces, self).populate()
        self.facts["all_ipv4_addresses"] = list()
        self.facts["all_ipv6_addresses"] = list()

        interfaces = self.parse_interfaces(self.responses[0])
        self.facts["interfaces"] = self.populate_interfaces(interfaces)

        data = self.responses[1]
        if len(data) > 0:
            data = self.parse_interfaces(data)
            self.populate_ipv6_interfaces(data)

        if "LLDP is not enabled" not in self.responses[2]:
            neighbors = self.responses[3]
            self.facts["neighbors"] = self.parse_neighbors(neighbors)

    def populate_interfaces(self, interfaces):
        facts = dict()
        for key, value in iteritems(interfaces):
            intf = dict()
            intf["description"] = self.parse_description(value)
            intf["macaddress"] = self.parse_macaddress(value)

            ipv4 = self.parse_ipv4(value)
            intf["ipv4"] = self.parse_ipv4(value)
            if ipv4:
                self.add_ip_address(ipv4["address"], "ipv4")

            intf["mtu"] = self.parse_mtu(value)
            intf["bandwidth"] = self.parse_bandwidth(value)
            intf["duplex"] = self.parse_duplex(value)
            intf["lineprotocol"] = self.parse_lineprotocol(value)
            intf["operstatus"] = self.parse_operstatus(value)
            intf["type"] = self.parse_type(value)

            facts[key] = intf
        return facts

    def populate_ipv6_interfaces(self, data):
        for key, value in iteritems(data):
            if key in ["No", "RPF"] or key.startswith("IP"):
                continue
            self.facts["interfaces"][key]["ipv6"] = list()
            addresses = re.findall(r"\s+(.+), subnet", value, re.M)
            subnets = re.findall(r", subnet is (.+)$", value, re.M)
            for addr, subnet in zip(addresses, subnets):
                ipv6 = dict(address=addr.strip(), subnet=subnet.strip())
                self.add_ip_address(addr.strip(), "ipv6")
                self.facts["interfaces"][key]["ipv6"].append(ipv6)

    def add_ip_address(self, address, family):
        if family == "ipv4":
            self.facts["all_ipv4_addresses"].append(address)
        else:
            self.facts["all_ipv6_addresses"].append(address)

    def parse_neighbors(self, neighbors):
        facts = dict()
        nbors = neighbors.split(
            "------------------------------------------------",
        )
        for entry in nbors[1:]:
            if entry == "":
                continue
            intf = self.parse_lldp_intf(entry)
            if intf not in facts:
                facts[intf] = list()
            fact = dict()
            fact["host"] = self.parse_lldp_host(entry)
            fact["remote_description"] = self.parse_lldp_remote_desc(entry)
            fact["port"] = self.parse_lldp_port(entry)
            facts[intf].append(fact)
        return facts

    def parse_interfaces(self, data):
        parsed = dict()
        key = ""
        for line in data.split("\n"):
            if len(line) == 0:
                continue
            if line[0] == " ":
                parsed[key] += "\n%s" % line
            else:
                match = re.match(r"^(\S+)", line)
                if match:
                    key = match.group(1)
                    parsed[key] = line
        return parsed

    def parse_description(self, data):
        match = re.search(r"Description: (.+)$", data, re.M)
        if match:
            return match.group(1)

    def parse_macaddress(self, data):
        match = re.search(r"address is (\S+)", data)
        if match:
            return match.group(1)

    def parse_ipv4(self, data):
        match = re.search(r"Internet address is (\S+)/(\d+)", data)
        if match:
            addr = match.group(1)
            masklen = int(match.group(2))
            return dict(address=addr, masklen=masklen)

    def parse_mtu(self, data):
        match = re.search(r"MTU (\d+)", data)
        if match:
            return int(match.group(1))

    def parse_bandwidth(self, data):
        match = re.search(r"BW (\d+)", data)
        if match:
            return int(match.group(1))

    def parse_duplex(self, data):
        match = re.search(r"(\w+)(?: D|-d)uplex", data, re.M)
        if match:
            return match.group(1)

    def parse_type(self, data):
        match = re.search(r"Hardware is (.+),", data, re.M)
        if match:
            return match.group(1)

    def parse_lineprotocol(self, data):
        match = re.search(r"line protocol is (.+)\s+?$", data, re.M)
        if match:
            return match.group(1)

    def parse_operstatus(self, data):
        match = re.search(r"^(?:.+) is (.+),", data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_intf(self, data):
        match = re.search(r"^Local Interface: (.+)$", data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_remote_desc(self, data):
        match = re.search(r"Port Description: (.+)$", data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_host(self, data):
        match = re.search(r"System Name: (.+)$", data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_port(self, data):
        match = re.search(r"Port id: (.+)$", data, re.M)
        if match:
            return match.group(1)
