# Copyright 2019 AT&T Intellectual Property.  All other rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import itertools
import logging
import pprint
import re

from spyglass.data_extractor.base import BaseDataSourcePlugin
from spyglass.data_extractor import models

from spyglass_plugin_xls.excel_parser import ExcelParser
from spyglass_plugin_xls.exceptions import ExcelFileNotSpecified
from spyglass_plugin_xls.exceptions import ExcelSpecNotSpecified

LOG = logging.getLogger(__name__)


class ExcelPlugin(BaseDataSourcePlugin):
    def __init__(self, region, **kwargs):
        super().__init__(region)
        LOG.info("Excel Plugin Initializing")
        self.SOURCE_TYPE = "excel"
        self.PLUGIN_NAME = "spyglass-plugin-xls"

        # Configuration parameters
        if 'excel_file' not in kwargs:
            raise ExcelFileNotSpecified()
        self.excel_path = kwargs["excel_file"]
        if 'excel_spec' not in kwargs:
            raise ExcelSpecNotSpecified()
        self.excel_spec = kwargs["excel_spec"]

        # Raw data from excel

        self.load_raw_data()

        LOG.info("Initiated data extractor plugin:{}".format(self.source_name))

    # Implement abstract methods

    def load_raw_data(self):
        excel_obj = ExcelParser(self.excel_path, self.excel_spec)
        self.raw_data = excel_obj.get_data()

    def parse_racks(self):
        """Return list of racks in the region

        :returns: list of Rack objects
        :rtype: list
        """

        LOG.info("Get Host Information")
        ipmi_data = self.raw_data["ipmi_data"][0]
        rackwise_hosts = self._get_rackwise_hosts()
        baremetal_racks = []
        for rack in rackwise_hosts.keys():
            host_list = []
            for host_data in rackwise_hosts[rack]:
                host = models.Host(
                    host_data,
                    rack_name=rack,
                    host_profile=ipmi_data[host_data]["host_profile"])
                host_list.append(host)
            baremetal_racks.append(models.Rack(rack, host_list))
        return baremetal_racks

    def parse_hosts(self, rack=None):
        """Return list of hosts in the region

        :param string rack: Rack name
        :returns: list of Host objects containing a rack's host data
        :rtype: list of models.Host
        """
        racks = self.parse_racks()
        if rack:
            for _rack in racks:
                if rack == _rack.name:
                    return _rack.hosts
        else:
            host_list = []
            for _rack in racks:
                host_list.extend(_rack.hosts)
            return host_list

    def parse_networks(self):
        """Extracts vlan network info from raw network data from excel"""

        vlan_list = []
        # Network data extracted from xl is formatted to have a predictable
        # data type. For e.g VlAN 45 extracted from xl is formatted as 45
        vlan_pattern = r"\d+"
        private_net = self.raw_data["network_data"]["private"]
        public_net = self.raw_data["network_data"]["public"]
        # Extract network information from private and public network data
        for net_type, net_val in itertools.chain(private_net.items(),
                                                 public_net.items()):
            tmp_vlan = {}
            # Ingress is special network that has no vlan, only a subnet string
            # So treatment for ingress is different
            if net_type != "ingress":
                # standardize the network name as net_type may ne different.
                # For e.g insteas of pxe it may be PXE or instead of calico
                # it may be ksn. Valid network names are pxe, calico, oob, oam,
                # overlay, storage, ingress
                tmp_vlan["name"] = self._get_network_name_from_vlan_name(
                    net_type)

                # extract vlan tag. It was extracted from xl file as 'VlAN 45'
                # The code below extracts the numeric data fron net_val['vlan']
                if net_val.get("vlan", "") != "":
                    value = re.findall(vlan_pattern, net_val["vlan"])
                    tmp_vlan["vlan"] = value[0]
                else:
                    tmp_vlan["vlan"] = "#CHANGE_ME"

                tmp_vlan["subnet"] = net_val.get("subnet", "#CHANGE_ME")
                tmp_vlan["gateway"] = net_val.get("gateway", "#CHANGE_ME")
            else:
                tmp_vlan["name"] = net_type
                tmp_vlan["subnet"] = net_val
            vlan_list.append(models.VLANNetworkData(**tmp_vlan))
        return vlan_list

    def parse_ips(self, host):
        """Return list of IPs on the host

        :param string host: Host name
        :returns: Dict of IPs per network on the host
        :rtype: dict
        Example: {'oob': {'ipv4': '192.168.1.10'},
                  'pxe': {'ipv4': '192.168.2.10'}}
        The network name from get_networks is expected to be the keys of this
        dict. In case some networks are missed, they are expected to be either
        DHCP or internally generated n the next steps by the design rules.
        """

        ipmi_data = self.raw_data["ipmi_data"][0]
        ip_ = models.IPList(
            **{
                "oob": ipmi_data[host].get("ipmi_address", "#CHANGE_ME"),
                "oam": ipmi_data[host].get("oam", "#CHANGE_ME"),
                "calico": ipmi_data[host].get("calico", "#CHANGE_ME"),
                "overlay": ipmi_data[host].get("overlay", "#CHANGE_ME"),
                "pxe": ipmi_data[host].get("pxe", "#CHANGE_ME"),
                "storage": ipmi_data[host].get("storage", "#CHANGE_ME"),
            })
        return ip_

    def parse_ldap_information(self):
        """Extract ldap information from excel"""

        ldap_raw_data = self.raw_data["site_info"]["ldap"]
        ldap_info = {}
        # raw url is 'url: ldap://example.com' so we are converting to
        # 'ldap://example.com'
        url = ldap_raw_data.get("url", "#CHANGE_ME")
        try:
            ldap_info["url"] = url.split(" ")[1]
            ldap_info["domain"] = url.split(".")[1]
        except IndexError as e:
            LOG.error("url.split:{}".format(e))
        ldap_info["common_name"] = ldap_raw_data.get(
            "common_name", "#CHANGE_ME")
        ldap_info["subdomain"] = ldap_raw_data.get("subdomain", "#CHANGE_ME")

        return ldap_info

    def parse_ntp_servers(self):
        """Returns a comma separated list of ntp ip addresses"""

        ntp_server_list = self._get_formatted_server_list(
            self.raw_data["site_info"]["ntp"])
        return ntp_server_list

    def parse_dns_servers(self):
        """Returns a comma separated list of dns ip addresses"""
        dns_server_list = self._get_formatted_server_list(
            self.raw_data["site_info"]["dns"])
        return dns_server_list

    def parse_domain_name(self):
        """Returns domain name extracted from excel file"""

        return self.raw_data["site_info"]["domain"]

    def parse_location_information(self):
        """Prepare location data from information extracted

        by ExcelParser(i.e raw data)
        """

        location_data = self.raw_data["site_info"]["location"]

        corridor_pattern = r"\d+"
        corridor_number = re.findall(
            corridor_pattern, location_data["corridor"])[0]
        name = location_data.get("name", "#CHANGE_ME")
        state = location_data.get("state", "#CHANGE_ME")
        country = location_data.get("country", "#CHANGE_ME")
        physical_location_id = location_data.get("physical_location", "")

        return {
            "name": name,
            "physical_location_id": physical_location_id,
            "state": state,
            "country": country,
            "corridor": "c{}".format(corridor_number),
        }

    # Implement helper functions

    @staticmethod
    def _get_network_name_from_vlan_name(vlan_name):
        """Network names are ksn, oam, oob, overlay, storage, pxe


        This is a utility function to determine the vlan acceptable
        vlan from the name extracted from excel file

        The following mapping rules apply:
            vlan_name contains "ksn or calico"  the network name is "calico"
            vlan_name contains "storage" the network name is "storage"
            vlan_name contains "server"  the network name is "oam"
            vlan_name contains "ovs"  the network name is "overlay"
            vlan_name contains "oob" the network name is "oob"
            vlan_name contains "pxe" the network name is "pxe"
        """

        network_names = [
            "ksn|calico",
            "storage",
            "oam|server",
            "ovs|overlay",
            "oob",
            "pxe",
        ]
        for name in network_names:
            # Make a pattern that would ignore case.
            # if name is 'ksn' pattern name is '(?i)(ksn)'
            name_pattern = "(?i)({})".format(name)
            if re.search(name_pattern, vlan_name):
                if name == "ksn|calico":
                    return "calico"
                if name == "storage":
                    return "storage"
                if name == "oam|server":
                    return "oam"
                if name == "ovs|overlay":
                    return "overlay"
                if name == "oob":
                    return "oob"
                if name == "pxe":
                    return "pxe"
        # if nothing matches
        LOG.error(
            "Unable to recognize VLAN name extracted from Plugin data source")
        return ""

    @staticmethod
    def _get_formatted_server_list(server_list):
        """Format dns and ntp server list as comma separated string"""

        # dns/ntp server info from excel is of the format
        # 'xxx.xxx.xxx.xxx, (aaa.bbb.ccc.com)'
        # The function returns a list of comma separated dns ip addresses
        servers = []
        for data in server_list:
            if "(" not in data:
                servers.append(data)
        formatted_server_list = models.ServerList(servers)
        return formatted_server_list

    def _get_rack(self, host):
        """Get rack id  from the rack string extracted from xl"""

        rack_pattern = r"\w.*(r\d+)\w.*"
        rack = re.findall(rack_pattern, host)[0]
        if not self.region:
            self.region = host.split(rack)[0]
        return rack

    def _get_rackwise_hosts(self):
        """Mapping hosts with rack ids"""

        rackwise_hosts = {}
        hostnames = self.raw_data["ipmi_data"][1]
        racks = self._get_rack_data()
        for rack in racks:
            if rack not in rackwise_hosts:
                rackwise_hosts[racks[rack]] = []
            for host in hostnames:
                if rack in host:
                    rackwise_hosts[racks[rack]].append(host)
        LOG.debug("rackwise hosts:\n%s", pprint.pformat(rackwise_hosts))
        return rackwise_hosts

    def _get_rack_data(self):
        """Format rack name"""

        LOG.info("Getting rack data")
        racks = {}
        hostnames = self.raw_data["ipmi_data"][1]
        for host in hostnames:
            rack = self._get_rack(host)
            racks[rack] = rack.replace("r", "rack")
        return racks