import isHtmlElement from "../is-type-of-element/is-html-element";

export const interactiveTagNames = {
  input: true,
  button: true,
  textarea: true,
  select: true,
  option: true,
  optgroup: true,
  video: true,
  audio: true
};

function isAnInteractiveElement(parent, current) {
  if (current == null) {
    return false;
  }

  // Most interactive elements cannot have children. However, some can such as 'button'.
  // See 'Permitted content' on https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button
  // Rather than having two different functions we can consolidate our checks into this single
  // function to keep things simple.
  // There is no harm checking if the parent has an interactive tag name even if it cannot have
  // any children. We need to perform this loop anyway to check for the contenteditable attribute
  const hasAnInteractiveTag = Boolean(interactiveTagNames[current.tagName.toLowerCase()]);
  if (hasAnInteractiveTag) {
    return true;
  }

  // contenteditable="true" or contenteditable="" are valid ways
  // of creating a contenteditable container
  // https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/contenteditable
  const attribute = current.getAttribute("contenteditable");
  if (attribute === "true" || attribute === "") {
    return true;
  }

  // nothing more can be done and no results found
  if (current === parent) {
    return false;
  }

  // recursion to check parent
  return isAnInteractiveElement(parent, current.parentElement);
}

export default function isEventInInteractiveElement(draggable, event) {
  const target = event.target;
  if (!isHtmlElement(target)) {
    return false;
  }
  return isAnInteractiveElement(draggable, target);
}
