const fetchMachine = Machine({
    id: 'contacts',
    initial: 'add_contacts_button',
    
    states: {
      add_contacts_button: {
        on: {
          ADDED: 'permission_screen'
        }
      },
      permission_screen: {
        on: {
          APPROVED: 'selection_screen',
          REJECTED: 'add_contacts_button'
        }
      },
      selection_screen: {
         on: {
          CONTACT_SELECTED: 'selection_screen',
          CONTACT_DESELECTED: 'selection_screen',
          SELECT_ALL: 'selection_screen',
          ADD_CONTACTS: 'conflict_screen'
        }
      },
      conflict_screen: {
        onEntry: 'checkForConflicts',
        on: {
          NO_CONFICTS_DETECTED: 'add_contacts_button',
          MERGED_CONTACTS: 'conflict_screen',
          CREATEDED_FIELD_TO_OVERWRITE:'conflict_screen',
           SELECTED_FIELD_FOR_ALL_OVERWRITES:'conflict_screen',
        }
      }
    }
  });