Rewrite main to use summary statistics

auctionsim/summary.go

@@ -48,7 +48,9 @@ type ResultSummary struct {
 	ValueDelta float64
 	/**
 	 * The rank of the bidder who actually had the highest value of the item.
-	 * The winner of the auction has rank 1.
+	 * The winner of the auction has rank 1. If all bidders had a true value of
+	 * negative infinity for the item, this will be greater than the number of
+	 * bidders.
 	 */
 	HighestValueRank int
 }
@@ -73,7 +75,7 @@ func Summarize(price float64, allBidders []Bidder) *ResultSummary {
 	}
 
 	winner := allBidders[len(allBidders)-1]
-	rube := Bidder{}
+	rube := Bidder{Value: math.Inf(-1)}
 	if maxIdx >= 0 {
 		rube = allBidders[maxIdx]
 	}

main/main.go

@@ -32,54 +32,30 @@ func main() {
 		log.Fatalf("can't run an auction with %d bidders", num)
 	}
 
-	price, allBidders := auctionsim.RunAuctionVerbosely(
+	result := auctionSim.Summarize(auctionsim.RunAuctionVerbosely(
 		&auctionsim.CappedBidderGenerator{
 			G:   auctionsim.NormalestBidderGenerator(),
 			Lim: num,
 		},
-	)
-	bidder := allBidders[len(allBidders)-1]
-
-	fmt.Printf("The auction winner paid ¤%f. They have %s.\n", price, deltaStr(bidder.Value-price))
-	fmt.Printf("The item was worth ¤%f to them.\n", bidder.Value)
-	fmt.Printf("They would have paid up to ¤%f for it.\n", bidder.BidCeiling())
+	))
+	fmt.Printf("The auction winner paid ¤%f. They have %s.\n", summary.Price, deltaStr(summary.WinnerProfit))
+	fmt.Printf("The item was worth ¤%f to them.\n", summary.WinnerValue)
+	fmt.Printf("They would have paid up to ¤%f for it.\n", summary.WinnerMaxBid)
 
 	fmt.Println()
-	i := len(allBidders) - 2
-	for i >= 0 && allBidders[i].Value < price {
-		i--
-	}
-
-	if i < 0 {
-		fmt.Printf("The item was not worth that to anybody.\n")
+	if summary.LosersWithRegrets < 1 {
+		fmt.Println("The item was not worth that to anybody.")
 	} else {
-		rube := allBidders[i]
-		fmt.Printf("The highest bidder who would have made a profit at that price stopped bidding at ¤%f.\n", rube.BidCeiling())
-		fmt.Printf("They should have kept bidding until ¤%f.\n", rube.Value)
-		if rankDelta := len(allBidders) - i - 1; rankDelta == 1 {
-			fmt.Println("They were outbid by 1 bidder.")
-		} else {
-			fmt.Printf("They were outbid by %d bidders.\n", rankDelta)
-		}
-		fmt.Printf("If they had paid the amount of the winning bid, they would have %s.\n", deltaStr(rube.Value-price))
+		fmt.Printf("The item was worth that to %d bidders, who stopped bidding too soon.\n", summary.LosersWithRegrets)
 	}
 
 	fmt.Println()
-	maxValue := math.Inf(-1)
-	maxIdx := -1
-	for i, b := range allBidders {
-		if b.Value > maxValue {
-			maxValue = b.Value
-			maxIdx = i
-		}
-	}
-
-	if maxIdx == -1 {
+	if summary.HighestValueRank > summary.Bidders {
 		fmt.Println("Wow! It was infinitely beyond worthless to everybody.")
 	} else {
-		fmt.Printf("The bidder who would have gotten the most value was outbid by %d bidders.\n", len(allBidders)-maxIdx-1)
-		rube := allBidders[maxIdx]
-		fmt.Printf("The item was worth at most ¤%f to them. Their maximum bid was ¤%f.\n", rube.Value, rube.BidCeiling())
-		fmt.Printf("If they had paid the winning bid, they would have %s.\n", deltaStr(rube.Value-price))
+		fmt.Printf("The bidder who would have gotten the most value was outbid by %d bidders.\n", summary.HighestValueRank-1)
+		fmt.Printf("The item was worth at most ¤%f to them. Their maximum bid was ¤%f.\n", summary.HighestValue, summary.HighestValuatorBid)
+		fmt.Printf("If they had paid the winning bid, they would have %s.\n", deltaStr(summary.MissedProfit))
+		fmt.Printf("They valued it ¤%f more than the winning bidder.\n", summary.ValueDelta)
 	}
 }