# -*- coding: utf-8 -*-
# SPDX-License-Identifier: GPL-3.0-or-later

from json import loads

from bases.FrameworkServices.UrlService import UrlService

ORDER = [
    'queries',
    'queries_dropped',
    'packets_dropped',
    'answers',
    'backend_responses',
    'backend_commerrors',
    'backend_errors',
    'cache',
    'servercpu',
    'servermem',
    'query_latency',
    'query_latency_avg'
]

CHARTS = {
    'queries': {
        'options': [None, 'Client queries received', 'queries/s', 'queries', 'dnsdist.queries', 'line'],
        'lines': [
            ['queries', 'all', 'incremental'],
            ['rdqueries', 'recursive', 'incremental'],
            ['empty-queries', 'empty', 'incremental']
        ]
    },
    'queries_dropped': {
        'options': [None, 'Client queries dropped', 'queries/s', 'queries', 'dnsdist.queries_dropped', 'line'],
        'lines': [
            ['rule-drop', 'rule drop', 'incremental'],
            ['dyn-blocked', 'dynamic block', 'incremental'],
            ['no-policy', 'no policy', 'incremental'],
            ['noncompliant-queries', 'non compliant', 'incremental']
        ]
    },
    'packets_dropped': {
        'options': [None, 'Packets dropped', 'packets/s', 'packets', 'dnsdist.packets_dropped', 'line'],
        'lines': [
            ['acl-drops', 'acl', 'incremental']
        ]
    },
    'answers': {
        'options': [None, 'Answers statistics', 'answers/s', 'answers', 'dnsdist.answers', 'line'],
        'lines': [
            ['self-answered', 'self answered', 'incremental'],
            ['rule-nxdomain', 'nxdomain', 'incremental', -1],
            ['rule-refused', 'refused', 'incremental', -1],
            ['trunc-failures', 'trunc failures', 'incremental', -1]
        ]
    },
    'backend_responses': {
        'options': [None, 'Backend responses', 'responses/s', 'backends', 'dnsdist.backend_responses', 'line'],
        'lines': [
            ['responses', 'responses', 'incremental']
        ]
    },
    'backend_commerrors': {
        'options': [None, 'Backend Communication Errors', 'errors/s', 'backends', 'dnsdist.backend_commerrors', 'line'],
        'lines': [
            ['downstream-send-errors', 'send errors', 'incremental']
        ]
    },
    'backend_errors': {
        'options': [None, 'Backend error responses', 'responses/s', 'backends', 'dnsdist.backend_errors', 'line'],
        'lines': [
            ['downstream-timeouts', 'timeout', 'incremental'],
            ['servfail-responses', 'servfail', 'incremental'],
            ['noncompliant-responses', 'non compliant', 'incremental']
        ]
    },
    'cache': {
        'options': [None, 'Cache performance', 'answers/s', 'cache', 'dnsdist.cache', 'area'],
        'lines': [
            ['cache-hits', 'hits', 'incremental'],
            ['cache-misses', 'misses', 'incremental', -1]
        ]
    },
    'servercpu': {
        'options': [None, 'DNSDIST server CPU utilization', 'ms/s', 'server', 'dnsdist.servercpu', 'stacked'],
        'lines': [
            ['cpu-sys-msec', 'system state', 'incremental'],
            ['cpu-user-msec', 'user state', 'incremental']
        ]
    },
    'servermem': {
        'options': [None, 'DNSDIST server memory utilization', 'MiB', 'server', 'dnsdist.servermem', 'area'],
        'lines': [
            ['real-memory-usage', 'memory usage', 'absolute', 1, 1 << 20]
        ]
    },
    'query_latency': {
        'options': [None, 'Query latency', 'queries/s', 'latency', 'dnsdist.query_latency', 'stacked'],
        'lines': [
            ['latency0-1', '1ms', 'incremental'],
            ['latency1-10', '10ms', 'incremental'],
            ['latency10-50', '50ms', 'incremental'],
            ['latency50-100', '100ms', 'incremental'],
            ['latency100-1000', '1sec', 'incremental'],
            ['latency-slow', 'slow', 'incremental']
        ]
    },
    'query_latency_avg': {
        'options': [None, 'Average latency for the last N queries', 'microseconds', 'latency',
                    'dnsdist.query_latency_avg', 'line'],
        'lines': [
            ['latency-avg100', '100', 'absolute'],
            ['latency-avg1000', '1k', 'absolute'],
            ['latency-avg10000', '10k', 'absolute'],
            ['latency-avg1000000', '1000k', 'absolute']
        ]
    }
}


class Service(UrlService):
    def __init__(self, configuration=None, name=None):
        UrlService.__init__(self, configuration=configuration, name=name)
        self.order = ORDER
        self.definitions = CHARTS

    def _get_data(self):
        data = self._get_raw_data()
        if not data:
            return None

        return loads(data)
