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import _ from 'lodash'
export const UPDATE_FILTER = 'VIEW_UPDATE_FILTER'
export const UPDATE_SORTER = 'VIEW_UPDATE_SORTER'
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.data.filter(action.filter).sort(action.sorter)
return {
...state,
data,
indexOf: _.fromPairs(data.map((item, index) => [item.id, index])),
}
case UPDATE_SORTER:
const data = state.data.slice().sort(action.sorter)
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.sorter),
}
case REMOVE:
if (state.indexOf[action.item.id] == null) {
return state
}
return {
...state,
...sortedRemove(state, action.id),
}
case UPDATE:
if (state.indexOf[action.item.id] == null) {
return
}
const nextState = {
...state,
...sortedRemove(state, action.id),
}
if (!action.filter(action.item)) {
return nextState
}
return {
...nextState,
...sortedInsert(nextState, action.item, action.sorter)
}
case RECEIVE:
const data = action.list.data.filter(action.filter).sort(action.sorter)
return {
...state,
data,
indexOf: _.fromPairs(data.map((item, index) => [item.id, index])),
}
default:
return state
}
}
export function updateFilter(list, filter = defaultFilter, sorter = defaultSorter) {
return { type: UPDATE_FILTER, list, filter, sorter }
}
export function updateSorter(sorter = defaultSorter) {
return { type: UPDATE_SORTER, sorter }
}
export function add(item, filter = defaultFilter, sorter = defaultSorter) {
return { type: ADD, item, filter, sorter }
}
export function update(id, item, filter = defaultFilter, sorter = defaultSorter) {
return { type: UPDATE, id, item, filter, sorter }
}
export function remove(id) {
return { type: REMOVE, id }
}
export function receive(list, filter = defaultFilter, sorter = defaultSorter) {
return { type: RECEIVE, list, filter, sorter }
}
function sortedInsert(state, item, sorter) {
const index = sortedIndex(state.data, item, sorter)
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 sortedIndex(list, item, sorter) {
let low = 0
let high = list.length
while (low < high) {
const middle = (low + high) >>> 1
if (sorter(item, list[middle]) > 0) {
low = middle + 1
} else {
high = middle
}
}
return low
}
function defaultFilter() {
return true
}
function defaultSorter(a, b) {
return 0
}
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