import * as THREE from 'three';
// Visitor navigation, not rigid-body physics. Radius is a comfortable 150 mm.
export const WALK_OBSTACLES=[[-1350,750,-700,500],[-690,180,-1490,-650],[480,2680,669,1711],[870,2040,-180,730],[-2650,-380,1820,2440],[100,2050,1880,2440],[-1780,-1240,450,980]];
export function joystickVector(x,y){const length=Math.hypot(x,y);if(length<=.12)return {x:0,y:0};const magnitude=Math.min(1,(length-.12)/.88);return {x:x/length*magnitude,y:y/length*magnitude};}
export function walkStep(position,delta){
 const next=position.clone();
 // Swept axis tests also prevent tunnelling if frame timing or movement speed changes.
 for(const axis of ['x','y']){
  const other=axis==='x'?'y':'x',from=next[axis];let to=THREE.MathUtils.clamp(from+delta[axis],axis==='x'?-2530:-2810,axis==='x'?2530:2260);
  for(const [left,right,front,back] of WALK_OBSTACLES){
   const min=axis==='x'?left:front,max=axis==='x'?right:back,otherMin=axis==='x'?front:left,otherMax=axis==='x'?back:right;
   if(next[other]<=otherMin||next[other]>=otherMax)continue;
   if(from<=min&&to>min)to=min;else if(from>=max&&to<max)to=max;
   else if(from>min&&from<max&&to>min&&to<max)to=from;
  }
  next[axis]=to;
 }
 next.z=THREE.MathUtils.clamp(next.z+delta.z,350,1630);return next;
}
export function navigationCapturesInput({active,tagName='',contentEditable=false,panelOpen=false,dialogOpen=false}){
 return Boolean(active&&!panelOpen&&!dialogOpen&&!contentEditable&&!/^(INPUT|TEXTAREA|SELECT|IFRAME)$/.test(tagName.toUpperCase()));
}
// OrbitControls.enabled disables its input listeners, not update()/damping.
// Consume pending orbit deltas once without changing the walking camera pose.
export function flushOrbitMotion(orbit,camera){
 if(typeof orbit?.update!=='function')return false;
 const position=camera.position.clone(),rotation=camera.quaternion.clone(),target=orbit.target.clone(),zoom=camera.zoom,damping=orbit.enableDamping,autoRotate=orbit.autoRotate;
 try{orbit.enableDamping=false;orbit.autoRotate=false;orbit.update();}
 finally{orbit.enableDamping=damping;orbit.autoRotate=autoRotate;camera.position.copy(position);camera.quaternion.copy(rotation);orbit.target.copy(target);if(camera.zoom!==zoom){camera.zoom=zoom;camera.updateProjectionMatrix();}}
 return true;
}