[golang] implement shipyards visits

golang/pkg/agent/utils.go

@@ -0,0 +1,67 @@
+package agent
+
+import (
+	"cmp"
+	"fmt"
+	"slices"
+
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/model"
+)
+
+type Point interface {
+	GetX() int
+	GetY() int
+}
+
+func distance2(a Point, b Point) int {
+	x2 := a.GetX() - b.GetX()
+	y2 := a.GetY() - b.GetY()
+	return x2*x2 + y2*y2
+}
+
+func (a *agent) isThereAShipAtWaypoint(waypoint *model.Waypoint) bool {
+	for _, ship := range a.ships {
+		if ship.Nav.WaypointSymbol == waypoint.Symbol {
+			return true
+		}
+	}
+	return false
+}
+
+func (a *agent) listWaypointsInSystemWithTrait(system *model.System, trait string) ([]model.Waypoint, error) {
+	waypoints, err := a.client.ListWaypointsInSystem(system, a.db)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list waypoints with trait: %w", err)
+	}
+	waypoints = slices.DeleteFunc(waypoints, func(waypoint model.Waypoint) bool {
+		for _, t := range waypoint.Traits {
+			if t.Symbol == trait {
+				return false
+			}
+		}
+		return true
+	})
+	return waypoints, nil
+}
+
+func (a *agent) listShipyardsInSystem(system *model.System) ([]model.Shipyard, error) {
+	waypoints, err := a.listWaypointsInSystemWithTrait(system, "SHIPYARD")
+	if err != nil {
+		return nil, fmt.Errorf("failed to list shipyards in system: %w", err)
+	}
+	var shipyards []model.Shipyard
+	for i := range waypoints {
+		shipyard, err := a.client.GetShipyard(&waypoints[i], a.db)
+		if err != nil {
+			return nil, fmt.Errorf("failed to list shipyards in system: %w", err)
+		}
+		shipyards = append(shipyards, *shipyard)
+	}
+	return shipyards, nil
+}
+
+func sortByDistanceFrom[P Point](origin P, destinations []P) {
+	slices.SortFunc(destinations, func(a, b P) int {
+		return cmp.Compare(distance2(origin, a), distance2(origin, b))
+	})
+}