import os

import redis
from meshtastic.mesh_pb2 import MeshPacket
from prometheus_client import CollectorRegistry, Counter

from exporter.registry import ProcessorRegistry


class MessageProcessor:
    def __init__(self, registry: CollectorRegistry, redis_client: redis.Redis):
        self.registry = registry
        self.redis_client = redis_client
        self.counter = Counter('mesh_packets', 'Number of mesh packets processed',
                               [
                                   'source_id', 'source_short_name', 'source_long_name',
                                   'destination_id', 'destination_short_name', 'destination_long_name',
                                   'portnum',
                                   'rx_time', 'rx_snr', 'hop_limit', 'want_ack', 'via_mqtt', 'hop_start'
                               ],
                               registry=self.registry)

    def process(self, mesh_packet: MeshPacket):
        port_num = int(mesh_packet.decoded.portnum)
        payload = mesh_packet.decoded.payload

        source_client_details = self._get_client_details(mesh_packet['from'])
        if os.getenv('MESH_HIDE_SOURCE_DATA', 'false') == 'true':
            source_client_details = {
                'id': source_client_details['id'],
                'short_name': 'Hidden',
                'long_name': 'Hidden',
            }
        destination_client_details = self._get_client_details(mesh_packet['to'])
        if os.getenv('MESH_HIDE_DESTINATION_DATA', 'false') == 'true':
            destination_client_details = {
                'id': destination_client_details['id'],
                'short_name': 'Hidden',
                'long_name': 'Hidden',
            }

        if port_num in map(int, os.getenv('FILTERED_PORTS', '1').split(',')):  # Filter out ports
            return None  # Ignore this packet

        self.counter.labels(
            source_id=source_client_details['id'],
            source_short_name=source_client_details['short_name'],
            source_long_name=source_client_details['long_name'],

            destination_id=destination_client_details['id'],
            destination_short_name=destination_client_details['short_name'],
            destination_long_name=destination_client_details['long_name'],

            rx_time=mesh_packet.rx_time,
            rx_snr=mesh_packet.rx_snr,
            hop_limit=mesh_packet.hop_limit,
            want_ack=mesh_packet.want_ack,
            via_mqtt=mesh_packet.via_mqtt,
            hop_start=mesh_packet.hop_start,
            portnum=port_num
        ).inc()

        processor = ProcessorRegistry.get_processor(port_num)(self.registry, self.redis_client)
        processor.process(payload)

    def _get_client_details(self, id: str):
        details = self.redis_client.hgetall(f"node:{id}")
        if details:
            return details

        return {
            'id': id,
            'short_name': 'Unknown',
            'long_name': 'Unknown',
        }