/**
* Assign a carrier for this treasure.
*
* @param lb A <code>LogBuilder</code> to log to.
* @return A suitable carrier <code>AIUnit</code>, to which this unit has been queued for
* transport.
*/
private AIUnit assignCarrier(LogBuilder lb) {
final AIUnit aiUnit = getAIUnit();
final Unit unit = getUnit();
final Player player = unit.getOwner();
final Europe europe = player.getEurope();
List<Unit> carriers = player.getCarriersForUnit(unit);
if (carriers.isEmpty()) return null;
// Pick the closest carrier and queue this unit.
final Location here = unit.getLocation();
int turns = INFINITY;
Unit closest = null;
for (Unit c : carriers) {
int t = c.getTurnsToReach(here);
if (turns > t) {
turns = t;
closest = c;
}
}
final AIMain aiMain = getAIMain();
TransportMission tm;
AIUnit aiCarrier;
if (closest != null
&& (aiCarrier = aiMain.getAIUnit(closest)) != null
&& (tm = aiCarrier.getMission(TransportMission.class)) != null) {
setTarget(europe);
aiUnit.changeTransport(aiCarrier);
if (tm.forceCollection(aiUnit, lb)) {
lb.add(" forced collection on ", aiCarrier.getUnit());
return aiCarrier;
}
}
return null;
}
/**
* Why would an IndianDemandMission be invalid with the given unit and colony.
*
* @param aiUnit The <code>AIUnit</code> to test.
* @param colony The <code>Colony</code> to test.
* @return A reason why the mission would be invalid with the unit and colony or null if none
* found.
*/
private static String invalidColonyReason(AIUnit aiUnit, Colony colony) {
String reason = invalidTargetReason(colony);
if (reason != null) return reason;
final Unit unit = aiUnit.getUnit();
final Player owner = unit.getOwner();
Player targetPlayer = colony.getOwner();
switch (owner.getStance(targetPlayer)) {
case UNCONTACTED:
case PEACE:
case ALLIANCE:
return "bad-stance";
case WAR:
case CEASE_FIRE:
Tension tension = unit.getHomeIndianSettlement().getAlarm(targetPlayer);
if (tension != null && tension.getLevel().compareTo(Tension.Level.CONTENT) <= 0)
return "happy";
break;
}
return null;
}
/**
* Find a suitable cash in location for this unit.
*
* @param aiUnit The <code>AIUnit</code> to execute this mission.
* @param range The maximum number of moves to search.
* @param deferOK Enables deferring to a fallback colony.
* @return A <code>PathNode</code> to the target, or null if not found which includes the case
* when Europe should be preferred (because the unit can not get there by itself).
*/
private static PathNode findTargetPath(AIUnit aiUnit, int range, boolean deferOK) {
if (invalidAIUnitReason(aiUnit) != null) return null;
final Unit unit = aiUnit.getUnit();
final Location start = unit.getPathStartLocation();
final Player player = unit.getOwner();
final Europe europe = player.getEurope();
final Unit carrier = unit.getCarrier();
final CostDecider standardCd = CostDeciders.avoidSettlementsAndBlockingUnits();
PathNode path;
if (player.getNumberOfSettlements() <= 0 || start == null) {
// No settlements or not on the map, so go straight to
// Europe. If Europe does not exist then this mission is
// doomed.
return (europe == null)
? null
: unit.findPath(unit.getLocation(), europe, carrier, standardCd);
}
// Can the unit get to a cash in site?
return unit.search(start, getGoalDecider(aiUnit, deferOK), standardCd, range, carrier);
}
/** {@inheritDoc} */
@Override
public Mission doMission(LogBuilder lb) {
lb.add(tag);
String reason = invalidReason();
if (reason != null) return lbFail(lb, false, reason);
final AIUnit aiUnit = getAIUnit();
final Unit unit = getUnit();
final IndianSettlement is = unit.getHomeIndianSettlement();
Direction d;
while (!this.demanded) {
Unit.MoveType mt = travelToTarget(getTarget(), null, lb);
switch (mt) {
case MOVE_HIGH_SEAS:
case MOVE_NO_MOVES:
case MOVE_ILLEGAL:
return lbWait(lb);
case MOVE_NO_REPAIR:
return lbFail(lb, false, AIUNITDIED);
case MOVE_NO_TILE:
return this;
case ATTACK_SETTLEMENT: // Arrived?
d = unit.getTile().getDirection(getTarget().getTile());
if (d != null) break; // Yes, arrived at target
// Fall through
case ATTACK_UNIT: // Something is blocking our path
Location blocker = resolveBlockage(aiUnit, getTarget());
if (blocker == null) {
moveRandomly(tag, null);
continue;
}
d = unit.getTile().getDirection(blocker.getTile());
if (AIMessage.askAttack(aiUnit, d)) {
return lbAttack(lb, blocker);
}
continue;
default:
return lbMove(lb, mt);
}
// Load the goods.
lbAt(lb);
Colony colony = (Colony) getTarget();
Player enemy = colony.getOwner();
Goods goods = selectGoods(colony);
GoodsType type = (goods == null) ? null : goods.getType();
int amount = (goods == null) ? 0 : goods.getAmount();
if (goods == null) {
if (!enemy.checkGold(1)) {
return lbDone(lb, false, "empty handed");
}
amount = enemy.getGold() / 20;
if (amount == 0) amount = enemy.getGold();
}
this.demanded = AIMessage.askIndianDemand(aiUnit, colony, type, amount);
if (this.demanded && (goods == null || hasTribute())) {
if (goods == null) {
return lbDone(lb, false, "accepted tribute ", amount, " gold");
}
lb.add(", accepted tribute ", goods);
return lbRetarget(lb);
}
// Consider attacking if not content.
int unitTension = (is == null) ? 0 : is.getAlarm(enemy).getValue();
int tension = Math.max(unitTension, unit.getOwner().getTension(enemy).getValue());
d = unit.getTile().getDirection(colony.getTile());
if (tension >= Tension.Level.CONTENT.getLimit() && d != null) {
if (AIMessage.askAttack(aiUnit, d)) lbAttack(lb, colony);
}
return lbDone(lb, false, "refused at ", colony);
}
// Take the goods home
for (; ; ) {
Unit.MoveType mt =
travelToTarget(getTarget(), CostDeciders.avoidSettlementsAndBlockingUnits(), lb);
switch (mt) {
case MOVE: // Arrived
break;
case MOVE_HIGH_SEAS:
case MOVE_NO_MOVES:
case MOVE_ILLEGAL:
return lbWait(lb);
case MOVE_NO_REPAIR:
return lbFail(lb, false, AIUNITDIED);
case MOVE_NO_TILE:
return this;
default:
return lbMove(lb, mt);
}
// Unload the goods
lbAt(lb);
GoodsContainer container = unit.getGoodsContainer();
for (Goods goods : container.getCompactGoods()) {
Goods tribute = container.removeGoods(goods.getType());
is.addGoods(tribute);
}
return lbDone(lb, false, "unloaded tribute");
}
}