HomeworksReducer.js

import { GET_TASKS,
  GET_SOLUTIONS,
  CORRECT_SOLUTION,
  ADD_TASK,
  DELETE_TASK,
  EDIT_TASK,
  ADD_SOLUTION,
  GET_PROFILES,
  GET_DOCUMENTS } from '../actions/types';

const INITIAL_STATE = {
  id: 0,
  tasks: [],
  solutions: [],
  profiles: [],
  documents: [],
};


export default (state = INITIAL_STATE, action) => {
  switch (action.type) {
    case GET_TASKS:
      return { ...state, tasks: action.payload };
    case GET_SOLUTIONS:
      return { ...state, solutions: action.payload };
    case CORRECT_SOLUTION:
      const modifiedSolution = state.solutions.find(sol => sol.id === action.payload.id);
      const modifiedSolutions = state.solutions.slice();
      modifiedSolutions.splice(state.solutions.indexOf(modifiedSolution), 1, action.payload);
      return { ...state, solutions: [...modifiedSolutions] };
    case ADD_SOLUTION:
      return { ...state, solutions: [action.payload, ...state.solutions], id: action.payload.id };
    case ADD_TASK:
      return { ...state, tasks: [action.payload, ...state.tasks] };
    case DELETE_TASK:
      return {
        ...state,
        tasks: [...state.tasks.slice(0, state.tasks.indexOf(action.payload)),
          ...state.tasks.slice(state.tasks.indexOf(action.payload) + 1)],
      };
    case EDIT_TASK:
      return {
        ...state,
        tasks: [...state.tasks.map((task) => {
          if (task.id !== action.payload.id) {
            return task;
          }
          return action.payload;
        }),
        ],
      };
    case GET_PROFILES:
      return { ...state, profiles: action.payload };
    case GET_DOCUMENTS:
      return { ...state, documents: action.payload };
    default:
      return state;
  }
};