1 files changed, 139 insertions, 0 deletions
diff --git a/golang/pkg/agent/trading.go b/golang/pkg/agent/trading.go
new file mode 100644
index 0000000..e84cef4
--- /dev/null
+++ b/golang/pkg/agent/trading.go
@@ -0,0 +1,139 @@
+package agent
+
+import (
+	"fmt"
+	"slices"
+
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/model"
+)
+
+type TradeGoodNotFoundError struct{}
+
+func (err *TradeGoodNotFoundError) Error() string {
+	return "trade good not found"
+}
+
+func (a *agent) buyTradeGood(ship *model.Ship, tradeGoodToBuy string) error {
+	if ship.Cargo.Units == ship.Cargo.Capacity {
+		return nil
+	}
+	// list markets would sell our goods
+	markets, err := a.listMarketsInSystem(ship.Nav.SystemSymbol)
+	if err != nil {
+		return fmt.Errorf("failed to list markets in system %s: %w", ship.Nav.SystemSymbol, err)
+	}
+	markets = slices.DeleteFunc(markets, func(market model.Market) bool {
+		for _, item := range market.Exports {
+			if item.Symbol == tradeGoodToBuy {
+				return false
+			}
+		}
+		return true
+	})
+	if len(markets) == 0 {
+		return &TradeGoodNotFoundError{}
+	}
+	// find the closest place to buy TODO
+	waypoint, err := a.client.GetWaypoint(ship.Nav.WaypointSymbol, a.db)
+	if err != nil {
+		return fmt.Errorf("failed to get nav waypoint %s: %w", ship.Nav.WaypointSymbol, err)
+	}
+	waypoints := make([]model.Waypoint, 0)
+	for i := range markets {
+		waypoint, err := a.client.GetWaypoint(markets[i].Symbol, a.db)
+		if err != nil {
+			return fmt.Errorf("failed to get waypoint %s: %w", markets[i].Symbol, err)
+		}
+		waypoints = append(waypoints, *waypoint)
+	}
+	sortByDistanceFrom(waypoint, waypoints)
+	// Go there and refresh our market data
+	if err := a.client.Navigate(ship, waypoints[0].Symbol, a.db); err != nil {
+		return fmt.Errorf("failed to navigate to %s: %w", waypoints[0].Symbol, err)
+	}
+	market, err := a.client.GetMarket(waypoints[0].Symbol, a.db)
+	if err != nil {
+		return fmt.Errorf("failed to get market %s: %w", waypoints[0].Symbol, err)
+	}
+	// Buy until full
+	for _, tradeGood := range market.TradeGoods {
+		if tradeGood.Type == "EXPORT" && tradeGood.Symbol == tradeGoodToBuy {
+			for ship.Cargo.Units < ship.Cargo.Capacity {
+				increment := min(ship.Cargo.Capacity-ship.Cargo.Units, tradeGood.TradeVolume)
+				if err := a.client.Purchase(ship, tradeGoodToBuy, increment, a.db); err != nil {
+					return fmt.Errorf("failed to purchase %d units of %s: %w", increment, tradeGoodToBuy, err)
+				}
+			}
+			break
+		}
+	}
+	return a.buyTradeGood(ship, tradeGoodToBuy)
+}
+
+func (a *agent) sellEverythingExcept(ship *model.Ship, keep string) error {
+	// First lets see what we need to sell
+	cargo := ship.Cargo.Inventory
+	cargo = slices.DeleteFunc(cargo, func(inventory model.Inventory) bool {
+		return inventory.Symbol == keep
+	})
+	if len(cargo) == 0 {
+		return nil
+	}
+	// list markets would buy our goods
+	markets, err := a.listMarketsInSystem(ship.Nav.SystemSymbol)
+	if err != nil {
+		return fmt.Errorf("failed to list markets in system %s: %w", ship.Nav.SystemSymbol, err)
+	}
+	markets = slices.DeleteFunc(markets, func(market model.Market) bool {
+		for _, item := range market.Imports {
+			for _, cargoItem := range cargo {
+				if item.Symbol == cargoItem.Symbol {
+					return false
+				}
+			}
+		}
+		return true
+	})
+	if len(markets) == 0 {
+		return nil
+	}
+	// find the closest place to sell something TODO
+	waypoint, err := a.client.GetWaypoint(ship.Nav.WaypointSymbol, a.db)
+	if err != nil {
+		return fmt.Errorf("failed to get nav waypoint %s: %w", ship.Nav.WaypointSymbol, err)
+	}
+	waypoints := make([]model.Waypoint, 0)
+	for i := range markets {
+		waypoint, err := a.client.GetWaypoint(markets[i].Symbol, a.db)
+		if err != nil {
+			return fmt.Errorf("failed to get waypoint %s: %w", markets[i].Symbol, err)
+		}
+		waypoints = append(waypoints, *waypoint)
+	}
+	sortByDistanceFrom(waypoint, waypoints)
+	// Go there and refresh our market data
+	if err := a.client.Navigate(ship, waypoints[0].Symbol, a.db); err != nil {
+		return fmt.Errorf("failed to navigate to %s: %w", waypoints[0].Symbol, err)
+	}
+	market, err := a.client.GetMarket(waypoints[0].Symbol, a.db)
+	if err != nil {
+		return fmt.Errorf("failed to get market %s: %w", waypoints[0].Symbol, err)
+	}
+	// sell everything we can
+	for _, cargoItem := range cargo {
+		units := cargoItem.Units
+		for _, tradeGood := range market.TradeGoods {
+			if tradeGood.Type == "IMPORT" && tradeGood.Symbol == cargoItem.Symbol {
+				for units > 0 {
+					increment := min(units, tradeGood.TradeVolume)
+					if err := a.client.Sell(ship, cargoItem.Symbol, increment, a.db); err != nil {
+						return fmt.Errorf("failed to sell %d units of %s: %w", units, cargoItem.Symbol, err)
+					}
+					units = units - increment
+				}
+				break
+			}
+		}
+	}
+	return a.sellEverythingExcept(ship, keep)
+}