Tweak flags

[planeteer] / planeteer.go

diff --git a/planeteer.go b/planeteer.go
index 87c74486583e3b835854bfe61b2ae84e4eaacecd..33f859ef346abf739d1eaa25b1e8d3bb66208987 100644 (file)
--- a/planeteer.go
+++ b/planeteer.go
@@ -18,33 +18,63 @@
 package main
 
 import "flag"
 package main
 
 import "flag"

+import "fmt"

 import "json"
 import "os"
 import "json"
 import "os"

-import "fmt"
+import "strings"
+
+var start = flag.String("start", "",
+       "The planet to start at")
+
+var end = flag.String("end", "",
+       "A comma-separated list of acceptable ending planets.")

 
 

-var datafile = flag.String("planet_data_file", "planet-data",
+var planet_data_file = flag.String("planet_data_file", "planet-data",

        "The file to read planet data from")
 
        "The file to read planet data from")
 

+var fuel = flag.Int("fuel", 16, "Reactor units")
+
+var hold = flag.Int("hold", 300, "Size of your cargo hold")
+
+var start_edens = flag.Int("start_edens", 0,
+       "How many Eden Warp Units are you starting with?")
+
+var end_edens = flag.Int("end_edens", 0,
+       "How many Eden Warp Units would you like to keep (not use)?")
+
+var cloak = flag.Bool("cloak", false,
+       "Make sure to end with a Device of Cloaking")
+
+var drones = flag.Int("drones", 0, "Buy this many Fighter Drones")
+
+var batteries = flag.Int("batteries", 0, "Buy this many Shield Batterys")
+
+var visit_string = flag.String("visit", "",
+       "A comma-separated list of planets to make sure to visit")
+
+func visit() []string {
+       return strings.Split(*visit_string, ",")
+}
+

 type Commodity struct {
 type Commodity struct {

-       Name      string

        BasePrice int
        CanSell   bool
        Limit     int
 }
        BasePrice int
        CanSell   bool
        Limit     int
 }

-
+type Planet struct {
+       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 {
 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     map[string]Planet
+       pi, ci      map[string]int // Generated; not read from file

 }
 
 func ReadData() (data planet_data) {
 }
 
 func ReadData() (data planet_data) {

-       f, err := os.Open(*datafile)
+       f, err := os.Open(*planet_data_file)

        if err != nil {
                panic(err)
        }
        if err != nil {
                panic(err)
        }


@@ -56,44 +86,154 @@ func ReadData() (data planet_data) {
        return
 }
 
        return
 }
 

-func TradeValue(data planet_data,
-                from_index, to_index, commodity_index, quantity int) int {
+/* This program operates by filling in a state table representing the best
+ * possible trips you could make; the ones that makes you the most money.
+ * This is feasible because we don't look at all the possible trips.
+ * We define a list of things that are germane to this game and then only
+ * consider the best outcome in each possible game state.
+ *
+ * Each cell in the table represents a state in the game.  In each cell,
+ * we track two things: 1. the most money you could possibly have while in
+ * that state and 2. one possible way to get into that state with that
+ * amount of money.
+ *
+ * A basic analysis can be done with a two-dimensional table: location and
+ * fuel.  planeteer-1.0 used this two-dimensional table.  This version
+ * adds features mostly by adding dimensions to this table.
+ *
+ * Note that the sizes of each dimension are data driven.  Many dimensions
+ * collapse to one possible value (ie, disappear) if the corresponding
+ * feature is not enabled.
+ */

 
 

-       commodity := &data.Commodities[commodity_index]
-       if !commodity.CanSell {
-               return 0
+// The official list of dimensions:
+const (
+       // Name                Num  Size  Description
+       Edens        = iota //   1     3  # of Eden warp units (0 - 2 typically)
+       Cloaks              //   2     2  # of Devices of Cloaking (0 or 1)
+       UnusedCargo         //   3     4  # of unused cargo spaces (0 - 3 typically)
+       Fuel                //   4    17  Reactor power left (0 - 16)
+       Location            //   5    26  Location (which planet)
+       Hold                //   6    15  Cargo bay contents (a *Commodity or nil)
+       NeedFighters        //   7     2  Errand: Buy fighter drones (needed or not)
+       NeedShields         //   8     2  Errand: Buy shield batteries (needed or not)
+       Visit               //   9  2**N  Visit: Stop by these N planets in the route
+
+       NumDimensions
+)
+
+func bint(b bool) int {
+       if b {
+               return 1
+       }
+       return 0
+}
+
+func DimensionSizes(data planet_data) []int {
+       eden_capacity := data.Commodities["Eden Warp Units"].Limit
+       cloak_capacity := bint(*cloak)
+       dims := []int{
+               eden_capacity + 1,
+               cloak_capacity + 1,
+               eden_capacity + cloak_capacity + 1,
+               *fuel + 1,
+               len(data.Planets),
+               len(data.Commodities),
+               bint(*drones > 0) + 1,
+               bint(*batteries > 0) + 1,
+               1 << uint(len(visit())),

        }
        }

+       if len(dims) != NumDimensions {
+               panic("Dimensionality mismatch")
+       }
+       return dims
+}
+
+func StateTableSize(dims []int) int {
+       sum := 0
+       for _, size := range dims {
+               sum += size
+       }
+       return sum
+}
+
+type State struct {
+       funds, from int
+}
+
+func NewStateTable(dims []int) []State {
+       return make([]State, StateTableSize(dims))
+}
+
+func EncodeIndex(dims, addr []int) int {
+       index := addr[0]
+       for i := 1; i < len(dims); i++ {
+               index = index*dims[i] + addr[i]
+       }
+       return index
+}
+
+func DecodeIndex(dims []int, index int) []int {
+       addr := make([]int, len(dims))
+       for i := len(dims) - 1; i > 0; i-- {
+               addr[i] = index % dims[i]
+               index /= dims[i]
+       }
+       addr[0] = index
+       return addr
+}

 
 

-       from_planet := &data.Planets[from_index]
-       from_relative_price, from_available := from_planet.RelativePrices[commodity.Name]
+/* 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
        }
        if !from_available {
                return 0
        }

-
-       to_planet := &data.Planets[to_index]
-       to_relative_price, to_available := to_planet.RelativePrices[commodity.Name]
+       to_relative_price, to_available := to.RelativePrices[commodity]

        if !to_available {
                return 0
        }
 
        if !to_available {
                return 0
        }
 

-       from_absolute_price := from_relative_price * commodity.BasePrice
-       to_absolute_price := to_relative_price * commodity.BasePrice
+       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)
        buy_price := from_absolute_price
        sell_price := int(float64(to_absolute_price) * 0.9)

-       return (sell_price - buy_price) * quantity
-
+       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) [][]*Commodity {
-       best := make([][]*Commodity, len(data.Planets))
-       for from_index := range data.Planets {
-               best[from_index] = make([]*Commodity, len(data.Planets))
-               for to_index := range data.Planets {
+func FindBestTrades(data planet_data) [][]string {
+       // TODO: We can't cache this because this can change based on available funds.
+       best := make([][]string, len(data.Planets))
+       for from := range data.Planets {
+               best[data.pi[from]] = make([]string, len(data.Planets))
+               for to := range data.Planets {

                        best_gain := 0
                        best_gain := 0

-                       for commodity_index := range data.Commodities {
-                               gain := TradeValue(data, from_index, to_index, commodity_index, 1)
+                       price_list := data.Planets[from].RelativePrices
+                       if len(data.Planets[to].RelativePrices) < len(data.Planets[from].RelativePrices) {
+                               price_list = data.Planets[to].RelativePrices
+                       }
+                       for commodity := range price_list {
+                               gain := TradeValue(data,
+                                       data.Planets[from],
+                                       data.Planets[to],
+                                       commodity,
+                                       10000000,
+                                       1)

                                if gain > best_gain {
                                if gain > best_gain {

-                                       best[from_index][to_index] = &data.Commodities[commodity_index]
+                                       best[data.pi[from]][data.pi[to]] = commodity

                                        gain = best_gain
                                }
                        }
                                        gain = best_gain
                                }
                        }


@@ -102,17 +242,43 @@ func FindBestTrades(data planet_data) [][]*Commodity {
        return best
 }
 
        return best
 }
 

+// (Example of a use case for generics in Go)
+func IndexPlanets(m *map[string]Planet) map[string]int {
+       index := make(map[string]int, len(*m))
+       i := 0
+       for e := range *m {
+               index[e] = i
+               i++
+       }
+       return index
+}
+func IndexCommodities(m *map[string]Commodity) map[string]int {
+       index := make(map[string]int, len(*m))
+       i := 0
+       for e := range *m {
+               index[e] = i
+               i++
+       }
+       return index
+}
+

 func main() {
        flag.Parse()
        data := ReadData()
 func main() {
        flag.Parse()
        data := ReadData()

+       data.pi = IndexPlanets(&data.Planets)
+       data.ci = IndexCommodities(&data.Commodities)
+       dims := DimensionSizes(data)
+       table := NewStateTable(dims)
+       table[0] = State{1, 1}

        best_trades := FindBestTrades(data)
        best_trades := FindBestTrades(data)

-       for from_index, from_planet := range data.Planets {
-               for to_index, to_planet := range data.Planets {
+
+       for from := range data.Planets {
+               for to := range data.Planets {

                        best_trade := "(nothing)"
                        best_trade := "(nothing)"

-                       if best_trades[from_index][to_index] != nil {
-                               best_trade = best_trades[from_index][to_index].Name
+                       if best_trades[data.pi[from]][data.pi[to]] != "" {
+                               best_trade = best_trades[data.pi[from]][data.pi[to]]

                        }
                        }

-                       fmt.Printf("%s to %s: %s\n", from_planet.Name, to_planet.Name, best_trade)
+                       fmt.Printf("%s to %s: %s\n", from, to, best_trade)

                }
        }
 }
                }
        }
 }