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import {ADD, 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
}
// for when the list changes
export function updateViewList(state, 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
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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