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import {fetchApi} from "../../utils"
export const ADD = "ADD"
export const UPDATE = "UPDATE"
export const REMOVE = "REMOVE"
export const REQUEST_LIST = "REQUEST_LIST"
export const RECEIVE_LIST = "RECEIVE_LIST"
const defaultState = {
list: [],
isFetching: false,
actionsDuringFetch: [],
byId: {},
indexOf: {},
}
export default function makeList(actionType, fetchURL) {
function reduceList(state = defaultState, action = {}) {
if (action.type !== actionType) {
return state
}
// Handle cases where we finished fetching or are still fetching.
if (action.cmd === RECEIVE_LIST) {
let s = {
isFetching: false,
actionsDuringFetch: [],
list: action.list,
byId: {},
indexOf: {}
}
for (let i = 0; i < action.list.length; i++) {
let item = action.list[i]
s.byId[item.id] = item
s.indexOf[item.id] = i
}
for (action of state.actionsDuringFetch) {
s = reduceList(s, action)
}
return s
} else if (state.isFetching) {
return {
...state,
actionsDuringFetch: [...state.actionsDuringFetch, action]
}
}
let list, itemIndex
switch (action.cmd) {
case ADD:
return {
list: [...state.list, action.item],
byId: {...state.byId, [action.item.id]: action.item},
indexOf: {...state.indexOf, [action.item.id]: state.list.length},
}
case UPDATE:
list = [...state.list]
itemIndex = state.indexOf[action.item.id]
list[itemIndex] = action.item
return {
...defaultState,
list
}
case REMOVE:
list = [...state.list]
itemIndex = state.indexOf[action.item.id]
list.splice(itemIndex, 1)
return {
...defaultState,
list,
byId: {...state.byId, [action.item.id]: undefined},
indexOf: {...state.indexOf, [action.item.id]: undefined},
}
case REQUEST_LIST:
return {
...defaultState,
isFetching: true
}
default:
console.debug("unknown action", action)
return state
}
}
function addItem(item) {
return {
type: actionType,
cmd: ADD,
item
}
}
function updateItem(item) {
return {
type: actionType,
cmd: UPDATE,
item
}
}
function removeItem(item) {
return {
type: actionType,
cmd: REMOVE,
item
}
}
function updateList(event) {
/* This action creater takes all WebSocket events */
return dispatch => {
switch (event.cmd) {
case "add":
return dispatch(addItem(event.data))
case "update":
return dispatch(updateItem(event.data))
case "remove":
return dispatch(removeItem(event.data))
case "reset":
return dispatch(fetchList())
default:
console.error("unknown list update", event)
}
}
}
function requestList() {
return {
type: actionType,
cmd: REQUEST_LIST,
}
}
function receiveList(list) {
return {
type: actionType,
cmd: RECEIVE_LIST,
list
}
}
function fetchList() {
return dispatch => {
dispatch(requestList())
fetchApi(fetchURL).then(response => {
return response.json().then(json => {
dispatch(receiveList(json.data))
})
})
}
}
return {reduceList, updateList, fetchList, addItem, updateItem, removeItem,}
}
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