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 = findNoteIndex(state, action.note.get('_id'));
      const note = findNote(state, action.note.get('_id'));
      return state.set(noteIndex, note.merge({deleted:true, modified:true}));
    }
    case types.DO_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'));
      let newNote = note.merge(action.data, {modified:true});
      return state.set(index, newNote);
    }
    case types.DELETE_SESSION: {
      const sessionId = action.session.get('_id');
      return state.map((note) => {
        if(sessionId === note.session) {
          return note.merge({deleted:true, modified:true});
        } else {
          return note;
        }
      })
    }
    default:
      return state;
  }
};