import { BOSS_DEFINITIONS } from "./bossCatalog";
import type { BossId, BossMechanicId } from "./types";

/** Mechanics that cannot be resolved safely when two bosses own them at once. */
export const ENCOUNTER_EXCLUSIVE_MECHANICS: ReadonlySet<BossMechanicId> = new Set(["memory-sequence"]);

export function canAddBossToEncounter(selectedBossIds: readonly BossId[], candidateBossId: BossId) {
  if (selectedBossIds.includes(candidateBossId)) return false;
  const candidateMechanics = BOSS_DEFINITIONS[candidateBossId].mechanicIds;
  for (const mechanicId of candidateMechanics) {
    if (!ENCOUNTER_EXCLUSIVE_MECHANICS.has(mechanicId)) continue;
    if (selectedBossIds.some((bossId) => BOSS_DEFINITIONS[bossId].mechanicIds.includes(mechanicId))) return false;
  }
  return true;
}

export function normalizeEncounterBossIds(requestedBossIds: readonly BossId[], limit = 3): BossId[] {
  const selected: BossId[] = [];
  for (const bossId of requestedBossIds) {
    if (selected.length >= limit) break;
    if (canAddBossToEncounter(selected, bossId)) selected.push(bossId);
  }
  return selected.length ? selected : ["bulldrome"];
}
