import type { AuraDefinition } from "./combatAuras";

export const WOW335_PRIEST_FOCUSED_WILL_TALENT_ID = "talent-1858";
export const WOW335_PRIEST_FOCUSED_WILL_AURA_ID = "wow335:priest:focused-will";
export const WOW335_PRIEST_FOCUSED_WILL_AURA_TAG = "wow335-priest-focused-will";
export const WOW335_PRIEST_FOCUSED_WILL_DURATION_MS = 10_000;
export const WOW335_PRIEST_FOCUSED_WILL_MAX_STACKS = 3;

const SPELL_CRITICAL_CHANCE_BONUS_BY_RANK = [0, 1, 2, 3] as const;
const HEALING_TAKEN_BONUS_PER_STACK = 0.03;

export interface Wow335PriestFocusedWillProfile {
  readonly rank: number;
  readonly spellCriticalChanceBonusPercent: number;
  readonly healingTakenBonusPerStack: number;
  readonly durationMs: number;
  readonly maxStacks: number;
}

function normalizedRank(rank: number): number {
  return Number.isFinite(rank) ? Math.max(0, Math.min(3, Math.trunc(rank))) : 0;
}

/** Local generated rank tooltip: +1/2/3% spell crit, plus the 3%-per-stack capstone. */
export function wow335PriestFocusedWillProfile(rank: number): Wow335PriestFocusedWillProfile {
  const learnedRank = normalizedRank(rank);
  return {
    rank: learnedRank,
    spellCriticalChanceBonusPercent: SPELL_CRITICAL_CHANCE_BONUS_BY_RANK[learnedRank] ?? 0,
    healingTakenBonusPerStack: learnedRank > 0 ? HEALING_TAKEN_BONUS_PER_STACK : 0,
    durationMs: learnedRank > 0 ? WOW335_PRIEST_FOCUSED_WILL_DURATION_MS : 0,
    maxStacks: learnedRank > 0 ? WOW335_PRIEST_FOCUSED_WILL_MAX_STACKS : 0,
  };
}

/** Focused Will procs only from a landed incoming critical hit while learned. */
export function wow335PriestFocusedWillShouldProc(
  rank: number,
  landed: boolean,
  critical: boolean,
): boolean {
  return normalizedRank(rank) > 0 && landed && critical;
}

export function wow335PriestFocusedWillAuraDefinition(rank: number): AuraDefinition | null {
  const profile = wow335PriestFocusedWillProfile(rank);
  if (profile.rank <= 0) return null;
  return {
    id: WOW335_PRIEST_FOCUSED_WILL_AURA_ID,
    name: "Focused Will",
    disposition: "buff",
    durationMs: profile.durationMs,
    maxStacks: profile.maxStacks,
    stackBehavior: "add",
    utilityTags: [WOW335_PRIEST_FOCUSED_WILL_AURA_TAG],
    modifiers: [{
      kind: "healing",
      direction: "taken",
      operation: "percent",
      value: profile.healingTakenBonusPerStack,
      perStack: true,
    }],
  };
}