/** The part of a key event the composer reads. */
export interface ComposerKey {
  key: string;
  shiftKey: boolean;
  keyCode?: number;
  nativeEvent?: { isComposing?: boolean };
}

/**
 * Whether the keyboard is a touch one, where Enter is a new line and the
 * arrow button sends.
 *
 * @returns {boolean} True on a coarse pointer.
 */
export const isTouchKeyboard = (): boolean =>
  typeof window !== 'undefined' &&
  typeof window.matchMedia === 'function' &&
  window.matchMedia('(pointer: coarse)').matches;

/**
 * Whether Enter sends the question: Shift+Enter is a new line, and while an
 * input method is composing a word Enter picks the candidate (a merchant
 * typing with diacritics or in Japanese sent half a word otherwise).
 *
 * @param {ComposerKey} event - The key event.
 * @param {boolean} touch - The keyboard is a touch one.
 * @returns {boolean} True when the key sends.
 */
export const sendsOnEnter = (event: ComposerKey, touch: boolean): boolean => {
  if (event.key !== 'Enter' || event.shiftKey || touch) return false;

  return !(event.nativeEvent?.isComposing || event.keyCode === 229);
};