(function(root,factory){
  const api=factory();
  if(typeof module==='object'&&module.exports)module.exports=api;
  root.BendInteractionState=api;
})(typeof globalThis!=='undefined'?globalThis:this,function(){
  'use strict';

  const DEFAULT_SCOPES=Object.freeze({
    any:Object.freeze(['camera','drawing','claim','wheel','reaction','minimap','dialog']),
    pointer:Object.freeze(['camera','drawing','claim','reaction','minimap']),
    camera:Object.freeze(['camera','wheel']),
    persistence:Object.freeze(['camera','drawing','claim','wheel','reaction','minimap']),
    world:Object.freeze(['camera','drawing','claim','wheel','reaction','minimap']),
    overview:Object.freeze(['camera','drawing','claim','wheel','reaction','minimap']),
    worker:Object.freeze(['drawing','claim'])
  });

  function createInteractionState(scopeDefinitions=DEFAULT_SCOPES){
    const owners=new Map(),listeners=new Set(),scopes=new Map(
      Object.entries(scopeDefinitions).map(([name,kinds])=>[name,new Set(kinds)])
    );
    let revision=0;
    const snapshot=()=>Object.freeze({
      revision,
      activeKinds:Object.freeze([...owners.keys()]),
      owners:Object.freeze(Object.fromEntries(owners))
    });
    const notify=()=>{const state=snapshot();for(const listener of listeners)listener(state)};
    const set=(kind,owner)=>{
      const key=String(kind||'');if(!key)throw new TypeError('Interaction kind is required');
      const next=owner==null||owner===false?null:String(owner),previous=owners.get(key)||null;
      if(previous===next)return false;
      if(next==null)owners.delete(key);else owners.set(key,next);
      revision++;notify();return true;
    };
    const active=(scope='any')=>{
      const kinds=scopes.get(scope);if(!kinds)throw new TypeError(`Unknown interaction scope: ${scope}`);
      for(const kind of kinds)if(owners.has(kind))return true;
      return false;
    };
    return Object.freeze({
      set,
      clear:kind=>set(kind,null),
      owner:kind=>owners.get(String(kind||''))||null,
      active,
      snapshot,
      subscribe(listener){if(typeof listener!=='function')throw new TypeError('Listener must be a function');listeners.add(listener);return()=>listeners.delete(listener)}
    });
  }

  return Object.freeze({DEFAULT_SCOPES,createInteractionState});
});