import type { TimedCombatEffect } from "./combatStore";

/** The final periodic tick is the moment the displayed aura expires. */
export function timedEffectExpiresAt(effect: TimedCombatEffect): number {
  return effect.nextTickAt + Math.max(0, effect.remainingTicks - 1) * effect.intervalMs;
}

export function timedEffectRemainingMs(effect: TimedCombatEffect, now: number): number {
  return Math.max(0, timedEffectExpiresAt(effect) - now);
}

/** Compact MMO-style countdown: whole seconds, then tenths for the last 10 seconds. */
export function formatTimedEffectTimer(remainingMs: number): string {
  const safeRemaining = Math.max(0, Number.isFinite(remainingMs) ? remainingMs : 0);
  const seconds = safeRemaining / 1_000;
  if (seconds >= 60) {
    const roundedSeconds = Math.ceil(seconds);
    const minutes = Math.floor(roundedSeconds / 60);
    return `${minutes}:${String(roundedSeconds % 60).padStart(2, "0")}`;
  }
  if (seconds >= 10) return String(Math.ceil(seconds));
  return seconds.toFixed(1);
}