"use strict";

// Layer: simulation/system-effects
// Owns frame updates for transient visual/effect entities.
(function (global) {
  function updateEffect(effect, dt, frameId = 0) {
    if (!effect || effect.dead) return false;
    const runDt = Math.min(0.24, Math.max(0, Number(effect._effectUpdateAccum || 0) + dt));
    effect._effectUpdateAccum = 0;
    effect._effectUpdatedFrame = frameId;
    effect.update(runDt);
    return true;
  }

  function updateEffects(worldRef, dt) {
    const effects = worldRef.effects || [];
    const total = effects.length;
    const frameId = (worldRef._effectUpdateFrameId || 0) + 1;
    worldRef._effectUpdateFrameId = frameId;
    if (total <= 56) {
      for (const ef of effects) updateEffect(ef, dt, frameId);
      worldRef._effectUpdateStats = { total, updated: total, skipped: 0, batched: false };
      return;
    }
    const budget = Math.max(40, Math.ceil(total * 0.42));
    let cursor = Math.max(0, Math.floor(worldRef._effectUpdateCursor || 0)) % total;
    let updated = 0;
    let scanned = 0;
    while (updated < budget && scanned < total) {
      const ef = effects[cursor];
      cursor = (cursor + 1) % total;
      scanned += 1;
      if (!ef || ef.dead) continue;
      updateEffect(ef, dt, frameId);
      updated += 1;
    }
    for (let i = 0; i < total; i += 1) {
      const ef = effects[i];
      if (!ef || ef.dead || ef._effectUpdatedFrame === frameId) continue;
      if (Number.isFinite(ef._effectUpdateAccum)) ef._effectUpdateAccum = Math.min(0.24, ef._effectUpdateAccum + dt);
      else ef._effectUpdateAccum = dt;
    }
    worldRef._effectUpdateCursor = cursor;
    worldRef._effectUpdateStats = { total, updated, skipped: Math.max(0, total - updated), batched: true };
  }

  global.TarinaiEffectsSimulationSystem = Object.freeze({
    phases: Object.freeze({ updateEffects }),
  });
})(typeof window !== "undefined" ? window : globalThis);