"use strict";

// Layer: entity-runtime/items/policy
// Owns the item update cadence and scheduled-item candidate set. Simulation
// helpers and the item scheduler both read this single policy instead of
// duplicating item-type timing rules.
(function (global) {
  const REALTIME_ITEM_TYPES = new Set(["ball", "balloon", "fan", "genkotsu", "firecracker", "flame_firecracker", "sticky_bomb", "robot_cleaner"]);
  const PIN_ITEM_TYPES = new Set(["pushpin", "oshibyo"]);
  const SCHEDULED_ITEM_TYPES = Object.freeze([
    "ball", "balloon", "fan", "genkotsu", "firecracker", "flame_firecracker", "sticky_bomb", "fire", "pushpin", "oshibyo",
    "plushie", "grass_bed", "zunchi", "robot_cleaner", "duplicator", "water", "trace", "splat", "ant_corpse", "food",
    "sweet", "love_mochi", "fight_mochi", "sleep_drug", "first_aid", "sedative", "laxative", "protein", "niteropu", "ammo", "mystery_drug", "mercury", "giant_drug", "dwarf_drug", "zunda_juice",
    "stone", "bed", "nest_box", "pipe", "toilet", "rain_shelter", "ant_nest", "signboard", "fence_v", "fence_h", "bounce_fence", "bounce_fence_v", "gate_fence", "one_way_fence", "rotator", "poison_block", "reciprocator", "rope", "rod", "spring", "wire", "insulated_wire", "pressure_switch",
  ]);


  function itemSpeed(item) {
    if (!item) return 0;
    return Math.hypot(item.vx || 0, item.vy || 0, item.impulseVx || 0, item.impulseVy || 0);
  }

  function itemRealtimeActive(item) {
    if (!item || item.dead) return false;
    if (!Number.isFinite(item._schedulerLastAt)) return true;
    const now = item.world?.time || 0;
    if (item.playerHeld || item._heldByPlayer || item.dragging || item.dropTimer > 0) return true;
    if (item.burning || (item.burnTimer || 0) > 0.02) return true;
    if (itemSpeed(item) > 0.08) return true;
    const activeUntil = Math.max(
      Number(item._activeUntil || -Infinity) || -Infinity,
      Number(item.awakeUntil || -Infinity) || -Infinity,
      Number(item.eatProtectedUntil || -Infinity) || -Infinity
    );
    if (activeUntil > now) return true;
    const lastActiveAt = Math.max(
      Number(item.lastKickedAt || -999) || -999,
      Number(item.lastShotAt || -999) || -999
    );
    if (now - lastActiveAt < 0.35) return true;
    // Fan wind is a continuous force. Scheduling it as an idle item turns the
    // accumulated dt into periodic gusts, so fans must remain in the realtime lane.
    if (item.type === "fan") return true;
    if (item.type === "firecracker" || item.type === "flame_firecracker" || item.type === "sticky_bomb") return Boolean(item.fuseTimer > 0 || item.armed || item.active);
    if (item.type === "robot_cleaner") return Boolean(item.active || item.cleanerActive || item.targetId || item.targetRef || item.state === "clean" || item.state === "return");
    if (PIN_ITEM_TYPES.has(item.type)) return Boolean(item.pinState && item.pinState !== "idle" && item.pinState !== "ground");
    if (item.type === "plushie") return Boolean(item.carriedById || item.onHead);
    return false;
  }

  function idleRealtimeInterval(item) {
    if (!item) return Infinity;
    if (item.type === "ball" || item.type === "balloon") return 0.24;
    if (item.type === "fan") return 0.60;
    if (item.type === "genkotsu") return 0.45;
    if (item.type === "firecracker" || item.type === "flame_firecracker" || item.type === "sticky_bomb") return 0.35;
    if (item.type === "robot_cleaner") return 0.75;
    if (PIN_ITEM_TYPES.has(item.type)) return 0.80;
    if (item.isStructure && item.type === "plushie") return 0.95;
    return 0.80;
  }

  function adjustedInterval(baseInterval) {
    if (!Number.isFinite(baseInterval) || baseInterval <= 0) return baseInterval;
    const profile = global.TarinaiPerf?.performanceProfile?.();
    if (profile?.simulationThrottled === false) return 0;
    return baseInterval * Math.max(1, Number(profile?.itemCadenceScale || 1));
  }

  function itemUpdateInterval(item) {
    if (!item || item.dead) return Infinity;
    // Mechanical bodies and links are owned by the central physics step.
    if (item.type === "rotator" || item.type === "reciprocator" || item.type === "poison_block" || item.type === "rope" || item.type === "rod" || item.type === "spring" || item.type === "wire" || item.type === "insulated_wire" || item.type === "pressure_switch") return Infinity;
    if (REALTIME_ITEM_TYPES.has(item.type)) return itemRealtimeActive(item) ? 0 : adjustedInterval(idleRealtimeInterval(item));
    if (PIN_ITEM_TYPES.has(item.type)) return itemRealtimeActive(item) ? 0 : adjustedInterval(idleRealtimeInterval(item));
    if (item.isStructure && item.type === "plushie") return itemRealtimeActive(item) ? 0 : adjustedInterval(idleRealtimeInterval(item));
    if (item.isStructure && item.type === "grass_bed") return adjustedInterval(3.0);
    if (item.type === "fire") return adjustedInterval(0.18);
    if (item.type === "nest_box" && global.TarinaiItemDynamicToolSystem?.nestBoxFireActive?.(item)) return adjustedInterval(0.18);
    if ((item.dropTimer || 0) > 0 || Math.hypot(item.vx || 0, item.vy || 0) > 0.08) return 0;
    if (item.type === "zunchi" && (item.burning || (item.burnTimer || 0) > 0.02)) return adjustedInterval(0.18);
    if (item.type === "zunchi") {
      const groundId = item.world?.groundType || (typeof world !== "undefined" ? world?.groundType : "") || "soil";
      const decayMul = Number(global.TarinaiGround?.zunchiDecayMultiplier?.(groundId) || 1) || 1;
      if (decayMul >= 100) return adjustedInterval(0.12);
      if (decayMul > 1.01) return adjustedInterval(0.28);
      return adjustedInterval(2.4);
    }
    if (item.type === "grass") return Infinity;
    if (item.type === "duplicator") return adjustedInterval(0.5);
    if (item.type === "water") return adjustedInterval(1.8);
    if (item.type === "trace" || item.type === "splat") return adjustedInterval(1.2);
    if (item.type === "ant_corpse") return adjustedInterval(3.5);
    if (typeof global.isServingFoodType === "function" && global.isServingFoodType(item.type)) return adjustedInterval(5.0);
    if (isServingFoodType(item.type)) return adjustedInterval(5.0);
    return Infinity;
  }

  function ensureBuckets(worldRef) {
    if (worldRef?.ensureItemBuckets) worldRef.ensureItemBuckets("item-update-policy");
  }

  function forScheduledItems(worldRef, visitor) {
    if (!worldRef || typeof visitor !== "function") return 0;
    let count = 0;
    if (!worldRef.itemsOfType) {
      for (const it of worldRef.items || []) {
        if (!it || it.dead || it.type === "grass") continue;
        visitor(it);
        count += 1;
      }
      return count;
    }
    ensureBuckets(worldRef);
    for (const type of SCHEDULED_ITEM_TYPES) {
      const bucket = worldRef.itemsOfType(type);
      for (const it of bucket || []) {
        if (!it || it.dead) continue;
        visitor(it);
        count += 1;
      }
    }
    return count;
  }

  function candidateItems(worldRef) {
    const out = [];
    forScheduledItems(worldRef, (item) => out.push(item));
    return out;
  }


  global.TarinaiItemUpdatePolicy = Object.freeze({
    itemUpdateInterval,
    itemRealtimeActive,
    forScheduledItems,
    ensureBuckets,
    candidateItems,
  });
})(typeof window !== "undefined" ? window : globalThis);