import Immutable from 'immutable';

import * as types from '../constants/actionTypes';

import NoteRecord from '../store/noteRecord';

const findNoteIndex = (notes, id) => {

  return notes.findIndex((note) => note.get('_id') === id);

}

const findNote = (notes, id) => {

  return notes.get(findNoteIndex(notes, id));

}

export default (state = Immutable.List([]), action) => {

  switch (action.type) {

    case types.ADD_NOTE:

      return state.push(new NoteRecord(action.note));

    case types.DELETE_NOTE:

      const noteIndex = state.findIndex((note) => note.get('_id') === action.note.get('_id'));

      return state.delete(noteIndex);

    case types.UPDATE_NOTE:

      const index = findNoteIndex(state, action.note.get('_id'));

      const note = findNote(state, action.note.get('_id'));

      return state.set(index, newNote);

    case types.DELETE_SESSION:

      return state.filter((note) => action.session.get('_id') !== note.session)

    default:

      return state;

  }

};