# 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.

import re
from mktxp.collectors.base_collector import BaseCollector
from mktxp.router_metric import RouterMetric


class MonitorCollector(BaseCollector):
    ''' Ethernet Interface Monitor Metrics collector
    '''    
    @staticmethod
    def collect(router_metric):
        monitor_labels = ['status', 'rate', 'full_duplex', 'name']
        monitor_records = router_metric.interface_monitor_records(monitor_labels)
        if not monitor_records:
            return

        # translate records to appropriate values
        for monitor_record in monitor_records:
            for monitor_label in monitor_labels:
                value = monitor_record.get(monitor_label, None)    
                if value:            
                    monitor_record[monitor_label] = MonitorCollector._translated_values(monitor_label, value)

        monitor_status_metrics = BaseCollector.gauge_collector('status', 'Current interface link status', monitor_records, 'status', ['name'])
        yield monitor_status_metrics

        # limit records according to the relevant metrics
        rate_records = [monitor_record for monitor_record in monitor_records if monitor_record.get('rate', None)]
        monitor_rates_metrics = BaseCollector.gauge_collector('rate', 'Actual interface connection data rate', rate_records, 'rate', ['name'])
        yield monitor_rates_metrics

        full_duplex_records = [monitor_record for monitor_record in monitor_records if monitor_record.get('full_duplex', None)]
        monitor_rates_metrics = BaseCollector.gauge_collector('full_duplex', 'Full duplex data transmission', full_duplex_records, 'full_duplex', ['name'])
        yield monitor_rates_metrics


    # Helpers
    @staticmethod
    def _translated_values(monitor_label, value):
        return {
                'status': lambda value: '1' if value=='link-ok' else '0',
                'rate': lambda value: MonitorCollector._rates(value),
                'full_duplex': lambda value: '1' if value=='true' else '0',
                'name': lambda value: value
                }[monitor_label](value)

    @staticmethod
    def _rates(rate_option):
        # according mikrotik docs, an interface rate should be one of these
        rate_value =  {
                '10Mbps': '10',
                '100Mbps': '100',
                '1Gbps': '1000',
                '2.5Gbps': '2500',
                '5Gbps': '5000',
                '10Gbps': '10000',
                '40Gbps': '40000'
                }.get(rate_option, None)
        if rate_value:
            return rate_value
        
        # ...or just calculate if it's not
        rate = lambda rate_option: 1000 if rate_option.find('Mbps') < 0 else 1
        return(int(float(re.sub('[^.\-\d]', '', rate_option)) * rate(rate_option)))