cmd: break group

internal/model/game/group.go

@@ -122,6 +122,51 @@ func (g *Game) JoinEqualGroups(raceName string) error {
 	return nil
 }
 
+func (g *Game) BreakGroup(raceName string, groupIndex, quantity uint) error {
+	ri, err := g.raceIndex(raceName)
+	if err != nil {
+		return err
+	}
+	return g.breakGroupInternal(ri, groupIndex, quantity)
+}
+
+func (g *Game) breakGroupInternal(ri int, groupIndex, quantity uint) error {
+	sgi := -1
+	var maxIndex uint
+	for i, sg := range g.listIndexShipGroups(ri) {
+		if sgi < 0 && sg.Index == groupIndex {
+			sgi = i
+		}
+		if sg.Index > maxIndex {
+			maxIndex = sg.Index
+		}
+	}
+	if sgi < 0 {
+		return e.NewEntityNotExistsError("group #%d", groupIndex)
+	}
+
+	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+		return e.NewShipsBusyError()
+	}
+
+	if g.ShipGroups[sgi].Number < quantity {
+		return e.NewBeakGroupNumberNotEnoughError("%d<%d", g.ShipGroups[sgi].Number, quantity)
+	}
+
+	if quantity == 0 || quantity == g.ShipGroups[sgi].Number {
+		g.ShipGroups[sgi].FleetID = nil
+	} else {
+		newGroup := g.ShipGroups[sgi]
+		newGroup.Number = quantity
+		g.ShipGroups[sgi].Number -= quantity
+		newGroup.Index = maxIndex + 1
+		newGroup.FleetID = nil
+		g.ShipGroups = append(g.ShipGroups, newGroup)
+	}
+
+	return nil
+}
+
 func (g *Game) joinEqualGroupsInternal(ri int) {
 	shipGroups := slices.Collect(maps.Values(maps.Collect(g.listIndexShipGroups(ri))))
 	origin := len(shipGroups)