import * as actionTypes from "../actions/actionTypes";
import initialState from "./initialState";

export default function groupsReducer(state = initialState.groups, action) {
  switch (action.type) {
    case actionTypes.CREATE_GROUP: {
      let group = action.group;
      if (state.length === 0) {
        group.id = 1;
      } else {
        group.id =
          Math.max.apply(
            Math,
            state.map(function(g) {
              return g.id;
            })
          ) + 1;
      }
      return [...state, { ...group }];
    }
    case actionTypes.LOAD_GROUPS_SUCCESS: {
      return action.groups;
    }
    case actionTypes.GET_GROUP_BY_ID: {
      let group = state.find(x => x.id === action.group.id);
      return group;
    }
    default:
      return state;
  }
}