"use strict";

// Layer: physics/projection-bridge
// Shared tiny helpers for positional projection used by links, mechanical
// bodies, and circle/circle collision code.
(function (global) {
  function num(v, fallback = 0) { const n = Number(v); return Number.isFinite(n) ? n : fallback; }

  function markSpatialDirty(worldRef, item, reason = "projection", threshold = 0.35, minInterval = 0.065) {
    const world = worldRef || item?.world || null;
    if (!world || !item) return false;
    const now = Number(world.time || 0) || 0;
    const x = num(item.x), y = num(item.y), r = num(item.r || item.radius || 0);
    const lastX = Number(item._lastProjectionSpatialDirtyX);
    const lastY = Number(item._lastProjectionSpatialDirtyY);
    const lastR = Number(item._lastProjectionSpatialDirtyR);
    const missing = !Number.isFinite(lastX) || !Number.isFinite(lastY) || !Number.isFinite(lastR);
    const moved = missing || Math.hypot(x - lastX, y - lastY) > threshold || Math.abs(r - lastR) > threshold;
    const due = now >= Number(item._nextProjectionSpatialDirtyAt || 0);
    if (!moved && !due) return false;
    item._lastProjectionSpatialDirtyX = x;
    item._lastProjectionSpatialDirtyY = y;
    item._lastProjectionSpatialDirtyR = r;
    item._nextProjectionSpatialDirtyAt = now + Math.max(0.016, num(minInterval, 0.065));
    world.markSpatialDirty?.(reason);
    return true;
  }

  global.TarinaiPhysicsProjectionSystem = Object.freeze({
    markSpatialDirty,
  });
})(typeof window !== "undefined" ? window : globalThis);