public Universe next() {
List<Fleet> futureFleets = new ArrayList<Fleet>();
List<Planet> newPlanets = new ArrayList<Planet>();
for (Planet planet : planets.items) {
newPlanets.add(planet.grow());
}
List<Fleet> arrivingFleets = new ArrayList<Fleet>();
for (Fleet fleet : fleets.items) {
Fleet movedFleet = fleet.move();
if (movedFleet.turnsRemaining > 0) {
futureFleets.add(movedFleet);
} else {
arrivingFleets.add(movedFleet);
}
}
Fleets arriving = new Fleets(arrivingFleets);
for (Fleet fleet : arrivingFleets) {
Planet planet = new Planets(newPlanets).find(fleet.destinationPlanet);
Fleets attacking = arriving.attacking(planet);
if (attacking.enemyFleets().ships() != attacking.myFleets().ships()) {
newPlanets.remove(planet);
planet = planet.receive(fleet);
newPlanets.add(planet);
}
}
return new Universe(new Planets(newPlanets), new Fleets(futureFleets), turn + 1, reservations);
}
