X-Git-Url: http://git.scottworley.com/planeteer/blobdiff_plain/9b3b3d9a3218395450fcc982c3d1c99e85c4e68f..5f1a50e1c7d4ae2908197673d5dbf948b3509a8f:/planeteer.go

diff --git a/planeteer.go b/planeteer.go
index 31dc7d0..bc47c3d 100644
--- a/planeteer.go
+++ b/planeteer.go
@@ -26,21 +26,20 @@ var datafile = flag.String("planet_data_file", "planet-data",
 	"The file to read planet data from")
 
 type Commodity struct {
-	Name      string
 	BasePrice int
 	CanSell   bool
 	Limit     int
 }
-
+type Planet struct {
+	Name     string
+	BeaconOn bool
+	/* Use relative prices rather than absolute prices because you
+	   can get relative prices without traveling to each planet. */
+	RelativePrices map [string] int
+}
 type planet_data struct {
-	Commodities []Commodity
-	Planets []struct {
-		Name     string
-		BeaconOn bool
-		/* Use relative prices rather than absolute prices because you
-		   can get relative prices without traveling to each planet. */
-		RelativePrices map [string] int
-	}
+	Commodities map [string] Commodity
+	Planets []Planet
 }
 
 func ReadData() (data planet_data) {
@@ -56,8 +55,75 @@ func ReadData() (data planet_data) {
 	return
 }
 
+/* What is the value of hauling 'commodity' from 'from' to 'to'?
+ * Take into account the available funds and the available cargo space. */
+func TradeValue(data planet_data,
+                from, to *Planet,
+                commodity string,
+                initial_funds, max_quantity int) int {
+	if !data.Commodities[commodity].CanSell {
+		return 0
+	}
+	from_relative_price, from_available := from.RelativePrices[commodity]
+	if !from_available {
+		return 0
+	}
+	to_relative_price, to_available := to.RelativePrices[commodity]
+	if !to_available {
+		return 0
+	}
+
+	base_price := data.Commodities[commodity].BasePrice
+	from_absolute_price := from_relative_price * base_price
+	to_absolute_price := to_relative_price * base_price
+	buy_price := from_absolute_price
+	sell_price := int(float64(to_absolute_price) * 0.9)
+	var can_afford int = initial_funds / buy_price
+	quantity := can_afford
+	if quantity > max_quantity {
+		quantity = max_quantity
+	}
+	return (sell_price - buy_price) * max_quantity
+}
+
+func FindBestTrades(data planet_data) [][]string {
+	best := make([][]string, len(data.Planets))
+	for from_index, from_planet := range data.Planets {
+		best[from_index] = make([]string, len(data.Planets))
+		for to_index, to_planet := range data.Planets {
+			best_gain := 0
+			price_list := from_planet.RelativePrices
+			if len(to_planet.RelativePrices) < len(from_planet.RelativePrices) {
+				price_list = to_planet.RelativePrices
+			}
+			for commodity := range price_list {
+				gain := TradeValue(data,
+				                   &from_planet,
+				                   &to_planet,
+				                   commodity,
+				                   10000000,
+				                   1)
+				if gain > best_gain {
+					best[from_index][to_index] = commodity
+					gain = best_gain
+				}
+			}
+		}
+	}
+	return best
+}
+
 func main() {
 	flag.Parse()
 	data := ReadData()
-	fmt.Printf("%v", data)
+	best_trades := FindBestTrades(data)
+	for from_index, from_planet := range data.Planets {
+		for to_index, to_planet := range data.Planets {
+			best_trade := "(nothing)"
+			if best_trades[from_index][to_index] != "" {
+				best_trade = best_trades[from_index][to_index]
+			}
+			fmt.Printf("%s to %s: %s\n", from_planet.Name, to_planet.Name, best_trade)
+		}
+	}
 }