import { WOW335_TALENT_NODES } from "./wow335Talents.generated";
import { applyAura, type ActiveAura, type AuraDefinition } from "./combatAuras";
import type { WotlkAttackKind } from "./wotlkStats";

export const WOW335_SHAMAN_NATURES_GUARDIAN_TALENT_ID = "talent-1699";
export const WOW335_SHAMAN_NATURES_GUARDIAN_NEXT_NATURE_CRIT_TAG = "wow335-shaman-natures-guardian-next-nature-crit";
export const WOW335_SHAMAN_NATURES_GUARDIAN_COOLDOWN_TAG = "wow335-shaman-natures-guardian-cooldown";

const NATURES_GUARDIAN_SOURCE = WOW335_TALENT_NODES.find((node) => (
  node.id === WOW335_SHAMAN_NATURES_GUARDIAN_TALENT_ID
));

export interface Wow335ShamanNaturesGuardianProfile {
  readonly rank: number;
  readonly procChancePercent: number;
  readonly healthThresholdPercent: number;
  readonly cooldownMs: number;
}

export interface Wow335ShamanNaturesGuardianIncomingEvent {
  readonly attackKind: WotlkAttackKind;
  readonly directDamage: boolean;
  readonly landed: boolean;
  readonly healthDamage: number;
  readonly healthBefore: number;
  readonly healthAfter: number;
  readonly maxHealth: number;
  /** Stable uniform roll in the inclusive range [0, 1). */
  readonly roll: number;
}

/** Reads the capstone proc chance and threshold from generated rank source. */
export function wow335ShamanNaturesGuardianProfileForRank(
  rank: number,
): Wow335ShamanNaturesGuardianProfile | null {
  const maxRank = NATURES_GUARDIAN_SOURCE?.rankEffects.length ?? 0;
  const safeRank = Number.isFinite(rank) ? Math.max(0, Math.min(maxRank, Math.trunc(rank))) : 0;
  if (safeRank <= 0) return null;

  const rankEffect = NATURES_GUARDIAN_SOURCE?.rankEffects[safeRank - 1];
  const description = NATURES_GUARDIAN_SOURCE?.rankDescriptions[safeRank - 1];
  const thresholdMatch = description?.match(/brings you below (\d+(?:\.\d+)?)% health/i);
  const cooldownMatch = description?.match(/effect has a (\d+(?:\.\d+)?) second cooldown/i);
  const procChancePercent = rankEffect?.procChance;
  const healthThresholdPercent = thresholdMatch ? Number(thresholdMatch[1]) : Number.NaN;
  const cooldownMs = cooldownMatch ? Number(cooldownMatch[1]) * 1_000 : Number.NaN;
  if (!Number.isFinite(procChancePercent) || procChancePercent! < 0 || procChancePercent! > 100
    || !Number.isFinite(healthThresholdPercent) || healthThresholdPercent <= 0 || healthThresholdPercent >= 100
    || !Number.isFinite(cooldownMs) || cooldownMs <= 0
    || !/your next Nature spell is guaranteed to critically strike/i.test(description ?? "")) return null;

  return { rank: safeRank, procChancePercent: procChancePercent!, healthThresholdPercent, cooldownMs };
}

/** The tooltip says the damaging attack brings the Shaman below the threshold. */
export function wow335ShamanNaturesGuardianShouldProc(
  rank: number,
  event: Wow335ShamanNaturesGuardianIncomingEvent,
): boolean {
  const profile = wow335ShamanNaturesGuardianProfileForRank(rank);
  if (!profile || !event.directDamage || !event.landed || event.healthDamage <= 0
    || !Number.isFinite(event.maxHealth) || event.maxHealth <= 0
    || !Number.isFinite(event.healthBefore) || !Number.isFinite(event.healthAfter)
    || !Number.isFinite(event.roll) || event.roll < 0 || event.roll >= 1) return false;

  const threshold = profile.healthThresholdPercent / 100;
  const healthBefore = event.healthBefore / event.maxHealth;
  const healthAfter = event.healthAfter / event.maxHealth;
  return healthBefore >= threshold
    && healthAfter < threshold
    && event.roll < profile.procChancePercent / 100;
}

function cooldownActive(auras: readonly ActiveAura[], actorId: string, now: number): boolean {
  return auras.some((aura) => aura.sourceId === actorId && aura.targetId === actorId
    && aura.definition.utilityTags?.includes(WOW335_SHAMAN_NATURES_GUARDIAN_COOLDOWN_TAG)
    && (aura.expiresAt === null || aura.expiresAt > now));
}

export function wow335ShamanNaturesGuardianApplyProc(
  auras: readonly ActiveAura[],
  actorId: string,
  rank: number,
  event: Wow335ShamanNaturesGuardianIncomingEvent,
  now: number,
): readonly ActiveAura[] {
  const profile = wow335ShamanNaturesGuardianProfileForRank(rank);
  if (!profile || cooldownActive(auras, actorId, now) || !wow335ShamanNaturesGuardianShouldProc(rank, event)) {
    return auras;
  }

  const nextNatureCrit: AuraDefinition = {
    id: WOW335_SHAMAN_NATURES_GUARDIAN_NEXT_NATURE_CRIT_TAG,
    name: "Nature's Guardian",
    description: "Your next Nature spell is guaranteed to critically strike.",
    disposition: "buff",
    // The generated tooltip gives no expiration for this charge.
    durationMs: null,
    maxStacks: 1,
    stackBehavior: "replace",
    utilityTags: [WOW335_SHAMAN_NATURES_GUARDIAN_NEXT_NATURE_CRIT_TAG],
  };
  const cooldown: AuraDefinition = {
    id: WOW335_SHAMAN_NATURES_GUARDIAN_COOLDOWN_TAG,
    name: "Nature's Guardian cooldown",
    disposition: "buff",
    durationMs: profile.cooldownMs,
    maxStacks: 1,
    stackBehavior: "refresh",
    utilityTags: [WOW335_SHAMAN_NATURES_GUARDIAN_COOLDOWN_TAG],
  };
  const withCharge = applyAura(auras, {
    definition: nextNatureCrit,
    sourceId: actorId,
    targetId: actorId,
    now,
  }).auras;
  return applyAura(withCharge, {
    definition: cooldown,
    sourceId: actorId,
    targetId: actorId,
    now,
  }).auras;
}

export function wow335ShamanNaturesGuardianNextCritIsReady(
  auras: readonly ActiveAura[],
  actorId: string,
  now: number,
): boolean {
  return auras.some((aura) => aura.sourceId === actorId && aura.targetId === actorId
    && aura.definition.utilityTags?.includes(WOW335_SHAMAN_NATURES_GUARDIAN_NEXT_NATURE_CRIT_TAG)
    && (aura.expiresAt === null || aura.expiresAt > now));
}

export function wow335ShamanNaturesGuardianConsumeNextCrit(
  auras: readonly ActiveAura[],
  actorId: string,
): readonly ActiveAura[] {
  return auras.filter((aura) => !(aura.sourceId === actorId && aura.targetId === actorId
    && aura.definition.utilityTags?.includes(WOW335_SHAMAN_NATURES_GUARDIAN_NEXT_NATURE_CRIT_TAG)));
}