DescribePath()

diff --git a/planeteer.go b/planeteer.go
index 7e915d20b4e8aadc51dd62c3173d8115fa934649..4dbb27b28c3cb5ece9e5380d83a910f90fc163f0 100644 (file)
--- a/planeteer.go
+++ b/planeteer.go
@@ -456,6 +456,39 @@ func FindBestState(data planet_data, dims []int, table []State) int {
        return max_index
 }
 
+func DescribePath(data planet_data, dims []int, table []State, start int) (description []string) {
+       for index := start; index > 0 && table[index].from > 0; index = table[index].from {
+               line := fmt.Sprintf("%10v", table[index].value)
+               addr := DecodeIndex(dims, index)
+               prev := DecodeIndex(dims, table[index].from)
+               if addr[Location] != prev[Location] {
+                       from := data.i2p[prev[Location]]
+                       to := data.i2p[addr[Location]]
+                       if addr[Fuel] != prev[Fuel] {
+                               line += fmt.Sprintf(" Jump from %v to %v (%v reactor units)", from, to, prev[Fuel]-addr[Fuel])
+                       } else if addr[Edens] != prev[Edens] {
+                               line += fmt.Sprintf(" Eden warp from %v to %v", from, to)
+                       } else {
+                               panic("Traveling without fuel?")
+                       }
+               }
+               if addr[Hold] != prev[Hold] {
+                       if addr[Hold] == 0 {
+                               quantity := *hold - (prev[UnusedCargo] + prev[Edens] + prev[Cloaks])
+                               line += fmt.Sprintf(" Sell %v %v", quantity, data.i2c[prev[Hold]])
+                       } else if prev[Hold] == 0 {
+                               quantity := *hold - (addr[UnusedCargo] + addr[Edens] + addr[Cloaks])
+                               line += fmt.Sprintf(" Buy %v %v", quantity, data.i2c[addr[Hold]])
+                       } else {
+                               panic("Switched cargo?")
+                       }
+
+               }
+               description = append(description, line)
+       }
+       return
+}
+
 // (Example of a use case for generics in Go)
 func IndexPlanets(m *map[string]Planet, start_at int) (map[string]int, []string) {
        e2i := make(map[string]int, len(*m)+start_at)
@@ -491,4 +524,8 @@ func main() {
        best := FindBestState(data, dims, table)
        fmt.Printf("Best state: %v (%v) with $%v\n",
                best, DecodeIndex(dims, best), table[best].value)
+       description := DescribePath(data, dims, table, best)
+       for i := len(description) - 1; i >= 0; i-- {
+               print(description[i], "\n")
+       }
 }