configurable-reactions/scripts/utils/token-utils.js

export function getBestTokenDocumentForActor(actor) {
  if (!actor) return null;

  const syntheticToken = getSyntheticTokenDocument(actor);
  if (syntheticToken) return syntheticToken;

  const controlled = canvas?.tokens?.controlled?.find(token => token.actor?.uuid === actor.uuid || token.actor?.id === actor.id);
  if (controlled) return controlled.document;

  const combatant = game.combat?.combatants?.find(c => c.actor?.uuid === actor.uuid || c.actor?.id === actor.id);
  if (combatant?.token) return combatant.token;

  const activeTokens = actor.getActiveTokens?.(true, true) ?? [];
  if (activeTokens.length === 1) return activeTokens[0].document;

  return activeTokens[0]?.document ?? null;
}

function getSyntheticTokenDocument(actor) {
  const tokenDocument = actor.token ?? actor.prototypeToken ?? null;
  if (tokenDocument?.documentName === "Token") return tokenDocument;
  return null;
}

export function getPrimaryOwner(actor) {
  if (!actor) return null;
  return game.users.find(user => user.active && !user.isGM && actor.testUserPermission(user, "OWNER")) ?? null;
}

export function isTokenSpaceOccupied(token, targetPosition) {
  const targetRect = new PIXI.Rectangle(targetPosition.x, targetPosition.y, token.w, token.h);

  return canvas.tokens.placeables.some(other => {
    if (other.id === token.id) return false;
    if (other.document.hidden) return false;

    const otherRect = new PIXI.Rectangle(other.document.x, other.document.y, other.w, other.h);
    return rectanglesOverlap(targetRect, otherRect);
  });
}

function rectanglesOverlap(a, b) {
  return a.x < b.x + b.width &&
    a.x + a.width > b.x &&
    a.y < b.y + b.height &&
    a.y + a.height > b.y;
}