# coding=utf8
## Copyright (c) 2020 Arseniy Kuznetsov
##
## This program 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 2
## of the License, or (at your option) any later version.
##
## This program 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.


from tabulate import tabulate   
from mktxp.cli.output.base_out import BaseOutputProcessor
from mktxp.datasources.dhcp_ds import DHCPMetricsDataSource


class DHCPOutput:
    ''' DHCP Clients CLI Output
    '''    
    @staticmethod
    def clients_summary(router_entry):
        dhcp_lease_labels = ['host_name', 'comment', 'active_address', 'address', 'mac_address', 'server', 'expires_after']
        dhcp_lease_records = DHCPMetricsDataSource.metric_records(router_entry, metric_labels = dhcp_lease_labels, add_router_id = False)
        if not dhcp_lease_records:
            print('No DHCP registration records')
            return 

        dhcp_by_server = {}
        for dhcp_lease_record in sorted(dhcp_lease_records, key = lambda dhcp_record: dhcp_record['active_address'], reverse=True):
            server = dhcp_lease_record['server']
            if server in dhcp_by_server.keys():
                dhcp_by_server[server].append(dhcp_lease_record)
            else:
                dhcp_by_server[server] = [dhcp_lease_record]         

        num_records = 0
        output_table = []
        for key in dhcp_by_server.keys():
            for record in dhcp_by_server[key]:
                output_table.append(BaseOutputProcessor.OutputDHCPEntry(**record))
                num_records += 1
            output_table.append({})
        print()
        print(tabulate(output_table, headers = "keys",  tablefmt="github"))
        print(tabulate([{0:'DHCP Clients:', 1:num_records}], tablefmt="text"))