// estimate the work of of incoming requests.
type WorkEstimatorFunc func(request *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate

func (e WorkEstimatorFunc) EstimateWork(r *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate {
	return e(r, flowSchemaName, priorityLevelName)
}

type workEstimator struct {
	// the minimum number of seats a request must occupy

}

type mutatingWorkEstimator struct {
	config     *WorkEstimatorConfig
	countFn    watchCountGetterFunc
	maxSeatsFn maxSeatsFunc
}

func (e *mutatingWorkEstimator) estimate(r *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate {
	minSeats := e.config.MinimumSeats
	maxSeats := e.maxSeatsFn(priorityLevelName)
	if maxSeats == 0 || maxSeats > e.config.MaximumSeatsLimit {
		maxSeats = e.config.MaximumSeatsLimit

			return h.workEstimator(r, "", "")
		}

		workEstimate := h.workEstimator(r, classification.FlowSchemaName, classification.PriorityLevelName)

		fcmetrics.ObserveWorkEstimatedSeats(classification.PriorityLevelName, classification.FlowSchemaName, workEstimate.MaxSeats())
		httplog.AddKeyValue(ctx, "apf_iseats", workEstimate.InitialSeats)

	}
	panicking = false
}

func observeQueueWaitTime(ctx context.Context, priorityLevelName, flowSchemaName, execute string, waitTime time.Duration) {
	metrics.ObserveWaitingDuration(ctx, priorityLevelName, flowSchemaName, execute, waitTime)
	endpointsrequest.TrackAPFQueueWaitLatency(ctx, waitTime)

	includeRequestDetails := len(r.URL.Query().Get(queryIncludeRequestDetails)) > 0

	tabWriter := tabwriter.NewWriter(w, 8, 0, 1, ' ', 0)
	tabPrint(tabWriter, rowForHeaders([]string{
		"PriorityLevelName",   // 1
		"FlowSchemaName",      // 2
		"QueueIndex",          // 3
		"RequestIndexInQueue", // 4
		"FlowDistingsher",     // 5
		"ArriveTime",          // 6
		"InitialSeats",        // 7
		"FinalSeats",          // 8

}

type listWorkEstimator struct {
	config        *WorkEstimatorConfig
	countGetterFn objectCountGetterFunc
	maxSeatsFn    maxSeatsFunc
}

func (e *listWorkEstimator) estimate(r *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate {
	minSeats := e.config.MinimumSeats
	maxSeats := e.maxSeatsFn(priorityLevelName)
	if maxSeats == 0 || maxSeats > e.config.MaximumSeatsLimit {
		maxSeats = e.config.MaximumSeatsLimit

// shouldDelayUpdate checks to see if a flowschema has been updated too often and returns true if a delay is needed.
// Only invoke this in the one and only worker goroutine
func (cfgCtlr *configController) shouldDelayUpdate(flowSchemaName string) bool {
	numUpdatesInPastMinute := 0
	oneMinuteAgo := cfgCtlr.clock.Now().Add(-1 * time.Minute)
	for idx, update := range cfgCtlr.mostRecentUpdates {
		if oneMinuteAgo.After(update.timeUpdated) {