aurora4x suggestion for automated refueling

// doesn't worry about cases where intermediate fuel sources extend the range accordingly.  Only a single fuel source is considered.
//
// functional assumptions:
// getPosition()  			returns a position object
// getNearestFuelSource() 	returns the fuel object of the nearest valid fuel
// computeDistance(a,b) 	returns distance between two position objects
// getTransitsFromTo(a,b) 	returns a list of transits from position a to b
// queueTask(a) 			adds task to objects task queue

currentRange 	= getCurrentShipRange()
designRange  	= getShipDesignRange()
queRange     	= 0
thresholdRange  = 0
shipPos      	= getPosition(this)

if (conditionalFuelOrderExists)
    thresholdRange = DesignRange * XX%	// XX% being the threshold percentage in the conditional order
else
    thresholdRange = DesignRange

taskPos=null
for task in desired que list
{
    fuelPos      = getPosition(getNearestFuelSource(shipPos))
    taskPos      = getPosition(task)
    taskDist     = computeDistance(shipPos,taskPos)
    shipFuelDist = computeDistance(shipPos,fuelPos)
    taskFuelDist = computeDistance(taskPos,fuelPos)

    if (currentRange - taskDist > thresholdRange 			// can I get there (at all/without conditional refuel aborting the trip)?
      && designRange - taskFuelDist > thresholdRange) 		// if I refuel, can I reach taskPos from fuelPos?
    {
        // Then yes, I can get there
        // Will I be low on fuel before/when i arrive?
        if (currentRange - taskDist < thresholdRange)
        {
            for transit in getTransitsFromTo(shipPos,fuelPos)
                queTask(transit)
            queTask(refuel)
            for transit in getTransitsFromTo(fuelPos,taskPos)
                queTask(transit)
            queueTask(task)
        }
        else
            queueTask(task)
    }
    else{
        // complain/react to unreachable task position
    }
    shipPos = taskPos
    fuelPos = getPosition(getNearestFuelSource(shipPos))
}