aman-sys/aman/sys/aco/RunwayManager.py

#!/usr/bin/env python

from datetime import datetime, timedelta

from aman.sys.aco.Configuration import Configuration
from aman.sys.aco.Constraints import SpacingConstraints
from aman.types.Inbound import Inbound

class RunwayManager:
    def __init__(self, configuration : Configuration):
        self.Spacings = SpacingConstraints()
        self.Configuration = configuration

        # initialize the tracker which inbound arrives at which runway
        self.RunwayInbounds = {}
        if None != configuration.PreceedingInbounds:
            for runway in configuration.PreceedingInbounds:
                self.RunwayInbounds[runway] = configuration.PreceedingInbounds[runway]
        for runway in configuration.RunwayConstraints.ActiveArrivalRunways:
            if not runway.Runway.Name in self.RunwayInbounds:
                self.RunwayInbounds[runway.Runway.Name] = None

    def calculateEarliestArrivalTime(self, runway : str, inbound : Inbound, useITA : bool, earliestArrivalTime : datetime):
        constrainedETA = None

        if None != self.RunwayInbounds[runway]:
            # get the WTC based ETA
            if None == self.RunwayInbounds[runway].WTC or None == inbound.WTC:
                spacingWTC = 3
            else:
                spacingWTC = self.Spacings[self.RunwayInbounds[runway].WTC][inbound.WTC]

            # get the runway time spacing
            spacingRunway = self.Configuration.RunwayConstraints.findRunway(runway).Spacing
            constrainedETA = self.RunwayInbounds[runway].PlannedArrivalTime + timedelta(minutes = max(spacingWTC, spacingRunway) / (inbound.PerformanceData.SpeedApproach / 60))

        # calculate the arrival times for the dependent inbounds
        for dependentRunway in self.Configuration.RunwayConstraints.findDependentRunways(runway):
            if None != self.RunwayInbounds[dependentRunway.Runway.Name]:
                candidate = self.RunwayInbounds[dependentRunway.Runway.Name].PlannedArrivalTime + timedelta(minutes = 3 / (inbound.PerformanceData.SpeedApproach / 60))
                if None == constrainedETA or candidate > constrainedETA:
                    constrainedETA = candidate

        # get the arrival time on the runway of the inbound
        if True == useITA:
            arrivalTime = inbound.ArrivalCandidates[runway].EarliestArrivalTime
        else:
            arrivalTime = inbound.ArrivalCandidates[runway].InitialArrivalTime

        if None == constrainedETA:
            return max(arrivalTime, earliestArrivalTime), timedelta(seconds = 0)
        else:
            eta = max(constrainedETA, earliestArrivalTime)
            if eta < arrivalTime:
                return arrivalTime, arrivalTime - eta
            else:
                return eta, timedelta(seconds = 0)

    def selectArrivalRunway(self, inbound : Inbound, useITA : bool, earliestArrivalTime : datetime):
        availableRunways = self.Configuration.RunwayConstraints.ActiveArrivalRunways

        #if 1 < len(availableRunways):
            # TODO filter based on type
            # TODO filter based on airline
            # ensure that at least one runway is available

        # fallback to check if we have available runways
        if 0 == len(availableRunways):
            runway = self.Configuration.RunwayConstraints.ActiveArrivalRunways[0]
            return runway, self.calculateEarliestArrivalTime(runway.Runway.Name, inbound, useITA, earliestArrivalTime)

        # start with the beginning
        selectedRunway = None
        lostTime = None
        eta = None

        # get the runway with the earliest ETA
        for runway in availableRunways:
            candidate, delta = self.calculateEarliestArrivalTime(runway.Runway.Name, inbound, useITA, earliestArrivalTime)
            if None == eta or eta > candidate:
                selectedRunway = runway.Runway
                lostTime = delta
                eta = candidate

        return selectedRunway, eta, lostTime