"use strict";

(function (global) {
  function bounceInsideWorld(obj, worldRef, opts = {}) {
    if (!obj || !worldRef) return false;
    const p = Math.max(opts.padding ?? 28, CONFIG.worldPadding || 30);
    const bx = opts.bounceX ?? opts.bounce ?? 0.72;
    const by = opts.bounceY ?? opts.bounce ?? 0.72;
    const spinBounce = opts.spinBounce ?? -0.72;
    let bounced = false;
    if (obj.x < p) { obj.x = p; obj.vx = Math.abs(obj.vx || 0) * bx; bounced = true; }
    if (obj.x > worldRef.w - p) { obj.x = worldRef.w - p; obj.vx = -Math.abs(obj.vx || 0) * bx; bounced = true; }
    if (obj.y < p) { obj.y = p; obj.vy = Math.abs(obj.vy || 0) * by; bounced = true; }
    if (obj.y > worldRef.h - p) { obj.y = worldRef.h - p; obj.vy = -Math.abs(obj.vy || 0) * by; bounced = true; }
    if (bounced && Number.isFinite(obj.spinVelocity)) obj.spinVelocity *= spinBounce;
    return bounced;
  }

  function applyKinematicItemMotion(item, worldRef, dt, opts = {}) {
    if (!item || !worldRef) return 0;
    const stopSpeed = opts.stopSpeed ?? 0.05;
    const speed = Math.hypot(item.vx || 0, item.vy || 0);
    item.prevX = item.x;
    item.prevY = item.y;
    if (speed <= stopSpeed) {
      item.vx = 0;
      item.vy = 0;
      if (Number.isFinite(item.spinVelocity)) {
        item.spinVelocity *= Math.pow(opts.spinRestDamp ?? 0.08, dt);
        item.spin = (item.spin || 0) + (item.spinVelocity || 0) * dt;
      }
      return speed;
    }
    item.x += (item.vx || 0) * dt;
    item.y += (item.vy || 0) * dt;
    bounceInsideWorld(item, worldRef, opts);
    const friction = Math.pow(opts.frictionBase ?? 0.68, dt * (opts.frictionRate ?? 1));
    item.vx *= friction;
    item.vy *= friction;
    if (opts.spin !== false) {
      item.spin = (item.spin || 0) + (item.spinVelocity || 0) * dt + (item.vx || 0) * dt / Math.max(7, item.r || 16);
      item.spinVelocity = (item.spinVelocity || 0) * Math.pow(opts.spinFrictionBase ?? 0.38, dt);
    }
    if (Math.hypot(item.vx || 0, item.vy || 0) < (opts.zeroBelow ?? 0)) {
      item.vx = 0;
      item.vy = 0;
      if (Number.isFinite(item.spinVelocity)) item.spinVelocity *= 0.3;
    }
    worldRef.drawListDirty = true;
    return speed;
  }

  global.TarinaiPhysics = { bounceInsideWorld, applyKinematicItemMotion };
})(typeof window !== "undefined" ? window : globalThis);