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* The coLAB project
* Copyright (C) 2021-2023 AlbaSim, MEI, HEIG-VD, HES-SO
*
* Licensed under the MIT License
*/
import { AsyncThunk } from '@reduxjs/toolkit';
import { ColabEntity } from 'colab-rest-client';
import * as React from 'react';
import { shallowEqual, TypedUseSelectorHook, useDispatch, useSelector } from 'react-redux';
import { AvailabilityStatus, FetchingStatus } from '../store/store';
import { AppDispatch, ColabState } from './store';
export { shallowEqual } from 'react-redux';
// Use throughout your app instead of plain `useDispatch` and `useSelector`
export const useAppDispatch = () => useDispatch<AppDispatch>();
export const useAppSelector: TypedUseSelectorHook<ColabState> = useSelector;
interface DataAndStatus<T> {
status: AvailabilityStatus;
data?: T;
}
function selectData<T extends ColabEntity>(
state: ColabState,
id: number,
selector: (state: ColabState) => Record<number, T | FetchingStatus>,
): DataAndStatus<T> {
const dataInStore = selector(state)[id];
if (dataInStore == null) {
return { status: 'NOT_INITIALIZED' };
} else Iif (typeof dataInStore === 'string') {
return { status: dataInStore };
}
return { status: 'READY', data: dataInStore };
}
export function useFetchById<T extends ColabEntity>(
id: number,
selector: (state: ColabState) => Record<number, T | FetchingStatus>,
// eslint-disable-next-line @typescript-eslint/ban-types
fetcher: AsyncThunk<T | null, number, {}>,
): DataAndStatus<T> {
const dispatch = useAppDispatch();
const { status, data }: DataAndStatus<T> = useAppSelector(
state => selectData<T>(state, id, selector),
shallowEqual,
);
React.useEffect(() => {
Iif (status === 'NOT_INITIALIZED' && id > 0) {
dispatch(fetcher(id));
}
}, [status, dispatch, fetcher, id]);
Iif (status === 'NOT_INITIALIZED' && id <= 0) {
return { status: 'ERROR' };
}
Iif (status === 'READY' && data != null) {
return { status, data };
}
return { status };
}
export function useFetchList<T extends ColabEntity>(
statusSelector: (state: ColabState) => AvailabilityStatus,
dataSelector: (state: ColabState) => T[],
// eslint-disable-next-line @typescript-eslint/ban-types, @typescript-eslint/no-explicit-any
fetcher: AsyncThunk<any, void, {}>,
): { status: AvailabilityStatus; data?: T[] } {
const dispatch = useAppDispatch();
const status = useAppSelector(statusSelector);
const data = useAppSelector(dataSelector, shallowEqual);
React.useEffect(() => {
Iif (status === 'NOT_INITIALIZED') {
dispatch(fetcher());
}
}, [status, dispatch, fetcher]);
Iif (status === 'READY' && data != null) {
return { status, data };
}
return { status };
}
// TODO Ideally make only one function for useFetchList and useFetchListWithArg
export function useFetchListWithArg<T extends ColabEntity, U>(
statusSelector: (state: ColabState) => AvailabilityStatus,
dataSelector: (state: ColabState) => T[],
// eslint-disable-next-line @typescript-eslint/ban-types, @typescript-eslint/no-explicit-any
fetcher: AsyncThunk<any, U, {}>,
fetcherArg: U,
): { status: AvailabilityStatus; data?: T[] } {
const dispatch = useAppDispatch();
const status = useAppSelector(statusSelector);
const data = useAppSelector(dataSelector, shallowEqual);
// Note : do not React.useEffect
Iif (status === 'NOT_INITIALIZED' && fetcherArg) {
dispatch(fetcher(fetcherArg));
}
Iif (status === 'NOT_INITIALIZED' && !fetcherArg) {
return { status: 'ERROR' };
}
Iif (status === 'READY' && data != null) {
return { status, data };
}
return { status };
}
export function useLoadDataWithArg<U>(
statusSelector: (state: ColabState) => AvailabilityStatus,
// eslint-disable-next-line @typescript-eslint/ban-types, @typescript-eslint/no-explicit-any
fetcher: AsyncThunk<any, U, {}>,
fetcherArg: U,
): AvailabilityStatus {
const dispatch = useAppDispatch();
const status = useAppSelector(statusSelector);
React.useEffect(() => {
Iif (status === 'NOT_INITIALIZED' && fetcherArg) {
dispatch(fetcher(fetcherArg));
}
}, [status, dispatch, fetcher, fetcherArg]);
Iif (status === 'NOT_INITIALIZED' && !fetcherArg) {
return 'ERROR';
}
return status;
}
const hasOwn = Object.prototype.hasOwnProperty;
/**
* kind of shallowEquals, but use shallowEqual to compare first-level-nested arrays
*/
export const customColabStateEquals = (a: unknown, b: unknown): boolean => {
if (Object.is(a, b)) {
return true;
}
if (typeof a === 'object' && a != null && typeof b === 'object' && b != null) {
const aKeys = Object.keys(a).sort();
const bKeys = Object.keys(b).sort();
if (aKeys.length !== bKeys.length) {
// keysets mismatch
return false;
}
for (const key in a) {
if (hasOwn.call(b, key)) {
if (key in a) {
const aValue = (a as { [key: string]: unknown })[key];
const bValue = (b as { [key: string]: unknown })[key];
if (!Object.is(aValue, bValue)) {
// values mismatch
if (Array.isArray(aValue) && Array.isArray(bValue)) {
// but values are arrays so they may match anyway
Iif (!shallowEqual(aValue, bValue)) {
// nope, array does not match
return false;
}
} else {
// not arrays => no match
return false;
}
}
}
} else {
return false;
}
}
return true;
} else {
return false;
}
};
export const useLoadingState = () => {
const [isLoading, setIsLoading] = React.useState<boolean>(false);
function startLoading() {
setIsLoading(true);
}
function stopLoading() {
setIsLoading(false);
}
return { isLoading, startLoading, stopLoading };
};
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