cmd: send fleet

internal/model/game/fleet_send.go

@@ -0,0 +1,80 @@
+package game
+
+import (
+	"fmt"
+	"slices"
+
+	e "github.com/iliadenisov/galaxy/internal/error"
+	"github.com/iliadenisov/galaxy/internal/util"
+)
+
+func (g *Game) SendFleet(raceName, fleetName string, planetNumber uint) error {
+	ri, err := g.raceIndex(raceName)
+	if err != nil {
+		return err
+	}
+	fi := g.fleetIndex(ri, fleetName)
+	if fi < 0 {
+		return e.NewEntityNotExistsError("fleet %q", fleetName)
+	}
+	return g.sendFleetInternal(ri, fi, planetNumber)
+}
+
+func (g *Game) sendFleetInternal(ri, fi int, planetNumber uint) error {
+	state, sourcePlanet, _ := FleetState(g, g.Fleets[fi].ID)
+	if StateInOrbit != state && StateLaunched != state {
+		return e.NewShipsBusyError()
+	}
+
+	p1, ok := PlanetByNum(g, *sourcePlanet)
+	if !ok {
+		return e.NewGameStateError("source planet #%d does not exists", sourcePlanet)
+	}
+	p2, ok := PlanetByNum(g, planetNumber)
+	if !ok {
+		return e.NewEntityNotExistsError("destination planet #%d", planetNumber)
+	}
+	rangeToDestination := util.ShortDistance(g.Map.Width, g.Map.Height, p1.X, p1.Y, p2.X, p2.Y)
+	if rangeToDestination > g.Race[ri].FlightDistance() {
+		return e.NewSendUnreachableDestinationError("range=%.03f", rangeToDestination)
+	}
+
+	for sg := range FleetGroups(g, ri, fi) {
+		st, ok := ShipClass(g, ri, sg.TypeID)
+		if !ok {
+			return e.NewGameStateError("not found: ShipType ID=%v", sg.TypeID)
+		}
+		if st.DriveBlockMass() == 0 {
+			return e.NewSendShipHasNoDrivesError("Class=%s", st.Name)
+		}
+	}
+
+	if *sourcePlanet == planetNumber {
+		UnsendFleet(g, ri, fi)
+		return nil
+	}
+
+	LaunchFleet(g, ri, fi, planetNumber)
+
+	return nil
+}
+
+func LaunchFleet(g *Game, ri, fi int, destination uint) {
+	for sg := range FleetGroups(g, ri, fi) {
+		sgi := slices.IndexFunc(g.ShipGroups, func(s ShipGroup) bool { return sg.Index == s.Index })
+		if sgi < 0 {
+			panic(fmt.Sprintf("LauncgFleet: cannot find ship group index=%d", sg.Index))
+		}
+		g.ShipGroups[sgi] = LaunchShips(sg, destination)
+	}
+}
+
+func UnsendFleet(g *Game, ri, fi int) {
+	for sg := range FleetGroups(g, ri, fi) {
+		sgi := slices.IndexFunc(g.ShipGroups, func(s ShipGroup) bool { return sg.Index == s.Index })
+		if sgi < 0 {
+			panic(fmt.Sprintf("UnsendFleet: cannot find ship group index=%d", sg.Index))
+		}
+		g.ShipGroups[sgi] = UnsendShips(sg)
+	}
+}