// entities.ts
// Copyright (C) 2020  Dwayne Harris

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import { Reducer } from 'redux'
import merge from 'lodash/merge'

import { EntitiesActions } from '../actions/entities'
import { EntitiesState } from '../types'

const initialState: EntitiesState = {}

const reducer: Reducer<EntitiesState, EntitiesActions> = (state = initialState, action) => {
    switch (action.type) {
        case 'ENTITIES_SET_ENTITY': {
            const { type, entity } = action.payload
            const collection = state[type] ?? {}
            const existing = collection[entity.id] ?? {}

            return {
                ...state,
                [type]: {
                    ...collection,
                    [entity.id]: merge(existing, entity),
                },
            }
        }
        case 'ENTITIES_SET_ENTITIES': {
            return merge(state, action.payload.entities)
        }
        default:
            return state
    }
}

export default reducer