// lists.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 { ListsActions } from '../actions/lists'
import { EntityListsState } from '../types'

const initialState: EntityListsState = {}

const reducer: Reducer<EntityListsState, ListsActions> = (state = initialState, action) => {
    switch (action.type) {
        case 'LISTS_APPEND':
            const list = state[action.payload.key] ?? {
                entities: [],
                continuation: undefined,
                checked: 0,
            }

            return {
                ...state,
                [action.payload.key]: {
                    entities: [
                        ...list.entities,
                        ...action.payload.entities,
                    ],
                    continuation: action.payload.continuation,
                    checked: Date.now(),
                },
            }
        case 'LISTS_SET':
            return {
                ...state,
                [action.payload.key]: {
                    entities: action.payload.entities,
                    continuation: action.payload.continuation,
                    checked: Date.now(),
                }
            }
        default:
            return state
    }
}

export default reducer