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import {ADD, UPDATE, REMOVE, REQUEST_LIST, RECEIVE_LIST} from "./list"
const defaultFilterFn = x => true
const defaultSortFn = false
const makeCompareFn = sortFn => {
let compareFn = (a, b) => {
let akey = sortFn(a),
bkey = sortFn(b)
if (akey < bkey) {
return -1
} else if (akey > bkey) {
return 1
} else {
return 0
}
}
if (sortFn.reverse)
return (a, b) => compareFn(b, a)
return compareFn
}
const sortedInsert = (list, sortFn, item) => {
let l = [...list, item]
let compareFn = makeCompareFn(sortFn)
// only sort if sorting order is not correct yet
if (sortFn && compareFn(list[list.length - 1], item) > 0) {
// TODO: This is untested
console.debug("sorting view...")
l.sort(compareFn)
}
return l
}
const sortedRemove = (list, sortFn, item) => {
let itemId = item.id
return list.filter(x => x.id !== itemId)
}
// for when the list changes
export function updateViewList(state, currentList, nextList, action, filterFn = defaultFilterFn, sortFn = defaultSortFn) {
switch (action.cmd) {
case REQUEST_LIST:
return state
case RECEIVE_LIST:
return updateViewFilter(nextList.list, filterFn, sortFn)
case ADD:
if (filterFn(action.item)) {
return sortedInsert(state, sortFn, action.item)
}
return state
case UPDATE:
// let's determine if it's in the view currently and if it should be in the view.
let currentItemState = currentList.byId[action.item.id],
nextItemState = action.item,
isInView = filterFn(currentItemState),
shouldBeInView = filterFn(nextItemState)
if (!isInView && shouldBeInView)
return sortedInsert(state, sortFn, action.item)
if (isInView && !shouldBeInView)
return sortedRemove(state, sortFn, action.item)
if (isInView && shouldBeInView && sortFn(currentItemState) !== sortFn(nextItemState)) {
let s = [...state]
s.sort(sortFn)
return s
}
return state
case REMOVE:
let isInView_ = filterFn(currentList.byId[action.item.id])
if (isInView_) {
return sortedRemove(state, sortFn, action.item)
}
return state
default:
console.error("Unknown list action: ", action)
return state
}
}
export function updateViewFilter(list, filterFn = defaultFilterFn, sortFn = defaultSortFn) {
let filtered = list.filter(filterFn)
if (sortFn)
filtered.sort(makeCompareFn(sortFn))
return filtered
}
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