export interface BossBalanceOverride {
  readonly id: string;
  readonly dungeonId: string;
  readonly entityId: string;
  readonly minimumLevel?: number;
  readonly maximumLevel?: number;
  readonly healthScale?: number;
  readonly damageScale?: number;
  readonly reason: string;
}

export interface ResolvedBossBalanceOverride {
  readonly healthScale: number;
  readonly damageScale: number;
  readonly matchedOverrideIds: readonly string[];
}

/**
 * Evidence-based exceptions to the shared boss curve. Entries may cover one
 * level, a bracket, or every level when both bounds are omitted. Multipliers
 * compose so a broad boss correction can coexist with a narrower bracket fix.
 */
export const BOSS_BALANCE_OVERRIDES: readonly BossBalanceOverride[] = Object.freeze([
  { id: "level-80-amanitar-pressure", dungeonId: "ahnkahet-old-kingdom", entityId: "entry-30258",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.7,
    reason: "Ready-five audit: 100% wipes and 3.14x median incoming pressure." },
  { id: "level-80-warp-splinter-pressure", dungeonId: "botanica", entityId: "entry-17977",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.56,
    reason: "Ready-five audit: 100% wipes and 3.90x median incoming pressure." },
  { id: "level-80-maiden-of-grief-pressure", dungeonId: "halls-of-stone", entityId: "entry-27975",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.56,
    reason: "Ready-five audit: 100% wipes and 3.93x median incoming pressure." },
  { id: "level-80-ick-pressure", dungeonId: "pit-of-saron", entityId: "entry-36476",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.54,
    reason: "Ready-five audit: 100% wipes and 4.11x median incoming pressure." },
  { id: "level-80-murmur-pressure", dungeonId: "shadow-labyrinth", entityId: "entry-18708",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.68,
    reason: "Ready-five audit: 100% wipes and 3.22x median incoming pressure." },
  { id: "level-80-keristrasza-pressure", dungeonId: "the-nexus", entityId: "entry-26723",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.7,
    reason: "Ready-five audit: 100% wipes and 3.12x median incoming pressure." },
  { id: "level-80-drakos-pressure", dungeonId: "the-oculus", entityId: "entry-27654",
    minimumLevel: 80, maximumLevel: 80, damageScale: 0.45,
    reason: "Ready-five audit: 100% wipes and 4.89x median incoming pressure." },
  { id: "level-80-black-knight-phase-3-pressure", dungeonId: "trial-of-the-champion",
    entityId: "wrath-event-black-knight-phase-3", minimumLevel: 80, maximumLevel: 80, damageScale: 0.5,
    reason: "Ready-five audit: 100% wipes and 4.33x median incoming pressure." },
]);

function sourceDungeonId(dungeonId: string, entityId: string): string {
  const prefix = "boss-testing:";
  const suffix = `:${entityId}`;
  return dungeonId.startsWith(prefix) && dungeonId.endsWith(suffix)
    ? dungeonId.slice(prefix.length, -suffix.length)
    : dungeonId;
}

function safeScale(value: number | undefined): number {
  return Number.isFinite(value) ? Math.max(0.05, value!) : 1;
}

export function resolveBossBalanceOverride(
  dungeonId: string,
  entityId: string,
  level: number,
  overrides: readonly BossBalanceOverride[] = BOSS_BALANCE_OVERRIDES,
): ResolvedBossBalanceOverride {
  const sourceId = sourceDungeonId(dungeonId, entityId);
  const matching = overrides.filter((entry) => (
    entry.dungeonId === sourceId
    && entry.entityId === entityId
    && level >= (entry.minimumLevel ?? Number.NEGATIVE_INFINITY)
    && level <= (entry.maximumLevel ?? Number.POSITIVE_INFINITY)
  ));
  return Object.freeze({
    healthScale: matching.reduce((scale, entry) => scale * safeScale(entry.healthScale), 1),
    damageScale: matching.reduce((scale, entry) => scale * safeScale(entry.damageScale), 1),
    matchedOverrideIds: Object.freeze(matching.map((entry) => entry.id)),
  });
}