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import _ from 'lodash'
export const UPDATE_FILTER = 'VIEW_UPDATE_FILTER'
export const UPDATE_SORT = 'VIEW_UPDATE_SORT'
export const ADD = 'VIEW_ADD'
export const UPDATE = 'VIEW_UPDATE'
export const REMOVE = 'VIEW_REMOVE'
export const RECEIVE = 'VIEW_RECEIVE'
const defaultState = {
data: [],
indexOf: {},
}
export default function reduce(state = defaultState, action) {
switch (action.type) {
case UPDATE_FILTER:
{
const data = action.list.filter(action.filter).sort(action.sort)
return {
...state,
data,
indexOf: _.fromPairs(data.map((item, index) => [item.id, index])),
}
}
case UPDATE_SORT:
{
const data = [...state.data].sort(action.sort)
return {
...state,
data,
indexOf: _.fromPairs(data.map((item, index) => [item.id, index])),
}
}
case ADD:
if (state.indexOf[action.item.id] != null || !action.filter(action.item)) {
return state
}
return {
...state,
...sortedInsert(state, action.item, action.sort),
}
case REMOVE:
if (state.indexOf[action.id] == null) {
return state
}
return {
...state,
...sortedRemove(state, action.id),
}
case UPDATE:
let hasOldItem = state.indexOf[action.item.id] !== null && state.indexOf[action.item.id] !== undefined
let hasNewItem = action.filter(action.item)
if (!hasNewItem && !hasOldItem) {
return state
}
if (hasNewItem && !hasOldItem) {
return {
...state,
...sortedInsert(state, action.item, action.sort)
}
}
if (!hasNewItem && hasOldItem) {
return {
...state,
...sortedRemove(state, action.item.id)
}
}
if (hasNewItem && hasOldItem) {
return {
...state,
...sortedUpdate(state, action.item, action.sort),
}
}
case RECEIVE:
{
const data = action.list.filter(action.filter).sort(action.sort)
return {
...state,
data,
indexOf: _.fromPairs(data.map((item, index) => [item.id, index])),
}
}
default:
return state
}
}
export function updateFilter(list, filter = defaultFilter, sort = defaultSort) {
return { type: UPDATE_FILTER, list, filter, sort }
}
export function updateSort(sort = defaultSort) {
return { type: UPDATE_SORT, sort }
}
export function add(item, filter = defaultFilter, sort = defaultSort) {
return { type: ADD, item, filter, sort }
}
export function update(item, filter = defaultFilter, sort = defaultSort) {
return { type: UPDATE, item, filter, sort }
}
export function remove(id) {
return { type: REMOVE, id }
}
export function receive(list, filter = defaultFilter, sort = defaultSort) {
return { type: RECEIVE, list, filter, sort }
}
function sortedInsert(state, item, sort) {
const index = sortedIndex(state.data, item, sort)
const data = [ ...state.data ]
const indexOf = { ...state.indexOf }
data.splice(index, 0, item)
for (let i = data.length - 1; i >= index; i--) {
indexOf[data[i].id] = i
}
return { data, indexOf }
}
function sortedRemove(state, id) {
const index = state.indexOf[id]
const data = [...state.data]
const indexOf = { ...state.indexOf, [id]: null }
data.splice(index, 1)
for (let i = data.length - 1; i >= index; i--) {
indexOf[data[i].id] = i
}
return { data, indexOf }
}
function sortedUpdate(state, item, sort) {
let data = [ ...state.data ]
let indexOf = { ...state.indexOf }
let index = indexOf[item.id]
data[index] = item
while (index + 1 < data.length && sort(data[index], data[index + 1]) > 0) {
data[index] = data[index + 1]
data[index + 1] = item
indexOf[item.id] = index + 1
indexOf[data[index].id] = index
++index
}
while (index > 0 && sort(data[index], data[index - 1]) < 0) {
data[index] = data[index - 1]
data[index - 1] = item
indexOf[item.id] = index - 1
indexOf[data[index].id] = index
--index
}
return { data, indexOf }
}
function sortedIndex(list, item, sort) {
let low = 0
let high = list.length
while (low < high) {
const middle = (low + high) >>> 1
if (sort(item, list[middle]) >= 0) {
low = middle + 1
} else {
high = middle
}
}
return low
}
function defaultFilter() {
return true
}
function defaultSort(a, b) {
return 0
}
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