#!/usr/bin/env python

import glob
import os
import sys
import time

import zmq
import zmq.auth

from aman.com import Communication_pb2
from aman.config.Server import Server
from threading import Thread

class ComThread(Thread):
    def __init__(self, com, aman):
        Thread.__init__(self)
        self.Com = com
        self.AMAN = aman

    def run(self):
        while True:
            try:
                msg = self.Com.Socket.recv(zmq.NOBLOCK)

                # parse the received message
                report = Communication_pb2.AircraftUpdate()
                report.ParseFromString(msg)

                # try to associate the received aircrafts to airports
                for inbound in report.reports:
                    self.AMAN.updateAircraftReport(inbound)

                # get the sequence of the airport
                if None != report.airport:
                    airport = self.AMAN.findAirport(report.airport)
                    if None != airport:
                        self.Com.sendSequence(report.airport, airport.inboundSequence(), airport.WeatherModel)

            except zmq.ZMQError as error:
                if zmq.EAGAIN == error.errno:
                    time.sleep(0.1)
                    continue
                else:
                    return

# @brief Receives and sends messages to EuroScope plugins
class Euroscope:
    def __init__(self, configPath : str, config : Server, aman):
        self.Context = None
        self.Socket = None
        self.Thread = None
        self.Context = zmq.Context()

        # find the key directories
        serverKeyPath = os.path.join(os.path.join(configPath, 'keys'), 'server')
        if False == os.path.isdir(serverKeyPath):
            sys.stderr.write('No directory for the server key found')
            sys.exit(-1)
        print('Path to the server key: ' + serverKeyPath)

        clientKeyPath = os.path.join(os.path.join(configPath, 'keys'), 'clients')
        if False == os.path.isdir(clientKeyPath):
            sys.stderr.write('No directory for the client keys found')
            sys.exit(-1)
        print('Path to the client keys: ' + clientKeyPath)

        # read the certificates
        keyPairPath = glob.glob(os.path.join(serverKeyPath, '*.key_secret'))
        if 1 != len(keyPairPath):
            sys.stderr.write('No public-private keypair found for the server certificate')
            sys.exit(-1)
        keyPair = zmq.auth.load_certificate(keyPairPath[0])

        # initialize the receiver
        self.Socket = zmq.Socket(self.Context, zmq.REP)
        self.Socket.setsockopt(zmq.CURVE_PUBLICKEY, keyPair[0])
        self.Socket.setsockopt(zmq.CURVE_SECRETKEY, keyPair[1])
        self.Socket.setsockopt(zmq.CURVE_SERVER, True)
        self.Socket.bind('tcp://' + config.Address + ':' + str(config.PortReceiver))
        #self.Socket.setsockopt(zmq.SUBSCRIBE, b'')
        self.Thread = ComThread(self, aman)
        self.Thread.setDaemon(True)
        self.Thread.start()
        print('Listening to tcp://' + config.Address + ':' + str(config.PortReceiver))

    def sendSequence(self, airport : str, inbounds, weather):
        if None == self.Socket:
            return

        sequence = Communication_pb2.AircraftSequence()
        sequence.airport = airport

        # convert the wind data
        if None != weather.Altitudes:
            for i in range(0, len(weather.Altitudes)):
                entry = sequence.windData.add()
                entry.altitude = int(weather.Altitudes[i])
                entry.direction = int(weather.Directions[i])
                entry.speed = int(weather.Windspeeds[i])

        # convert the inbound sequence
        for inbound in inbounds:
            entry = sequence.sequence.add()
            entry.callsign = inbound.Callsign
            entry.fixed = inbound.FixedSequence
            if None != inbound.PlannedStar:
                entry.arrivalRoute = inbound.PlannedStar.Name
            if None != inbound.PlannedRunway:
                entry.arrivalRunway = inbound.PlannedRunway.Name

            if None != inbound.PerformanceData:
                entry.performance.iasAboveFL240 = int(round(inbound.PerformanceData.SpeedAboveFL240))
                entry.performance.iasAboveFL100 = int(round(inbound.PerformanceData.SpeedAboveFL100))
                entry.performance.iasBelowFL100 = int(round(inbound.PerformanceData.SpeedBelowFL100))
                entry.performance.iasApproach = int(round(inbound.PerformanceData.SpeedApproach))

            if None != inbound.PlannedArrivalRoute:
                for waypoint in inbound.PlannedArrivalRoute:
                    wp = entry.waypoints.add()
                    wp.name = waypoint.Waypoint.Name
                    wp.altitude = int(round(waypoint.Altitude))
                    wp.indicatedAirspeed = int(round(waypoint.IndicatedAirspeed))
                    wp.groundSpeed = int(round(waypoint.GroundSpeed))

                    pta = str(waypoint.PTA)
                    delimiter = pta.find('.')
                    if -1 == delimiter:
                        delimiter = pta.find('+')

                    wp.pta = pta[0:delimiter]

        message = sequence.SerializeToString()
        self.Socket.send(message)