import { paths } from "../libs/paths";
import { newReplyTextareasObserver } from "../libs/dom-utils";

const shortcuts = {
  italicise(event) {
    const { target } = event;
    const { value, selectionEnd, selectionStart } = target;

    const selection = value.substring(selectionStart, selectionEnd);
    let before;
    let after;

    if (
      value.charAt(selectionStart - 1) === "*" &&
      value.charAt(selectionEnd) === "*"
    ) {
      before = value.substring(0, selectionStart - 1);
      after = value.substring(selectionEnd + 1, value.length);
      target.value = `${before}${selection}${after}`;
      target.selectionStart = selectionStart - 1;
      target.selectionEnd = selectionEnd - 1;
    } else {
      before = value.substring(0, selectionStart);
      after = value.substring(selectionEnd, value.length);
      target.value = `${before}*${selection}*${after}`;
      target.selectionStart = selectionStart + 1;
      target.selectionEnd = selectionEnd + 1;
    }
  },

  quickSubmit(event) {
    event.target.form.submit();
  },
};

function handleKeydown(event) {
  if (event.ctrlKey || event.metaKey) {
    switch (event.keyCode) {
      case 73:
        shortcuts.italicise(event);
        break;

      case 13:
        shortcuts.quickSubmit(event);
        break;

      default:
        break;
    }
  }
}

function init() {
  const textareas = document.querySelectorAll("textarea");
  const inputs = document.querySelectorAll("input");
  const fields = [...textareas, ...inputs];

  for (const field of fields) {
    field.addEventListener("keydown", handleKeydown);
  }

  newReplyTextareasObserver(handleKeydown);

  return true;
}

const details = {
  id: "key-bindings-on-input-fields",
  pages: {
    include: [...paths.comments, ...paths.forms],
    exclude: [],
  },
  loginRequired: false,
  init,
};

export default details;