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localStorage.tsx
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localStorage.tsx
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import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
import { defaultTimers, initialPlaylist } from '../shared/constants';
import { Status, timerType, TimerTypes } from '../shared/types';
//Custom hook to use the localStorage easily
const useLocalStorage = (key: string, initialValue: any) => {
const [storedValue, setStoredValue] = useState(() => {
try {
const item = window.localStorage.getItem(key);
return item ? JSON.parse(item) : initialValue;
} catch (err) {
console.error(err);
return initialValue;
}
});
const setValue = (value: any) => {
try {
const valueToStore =
value instanceof Function ? value(storedValue) : value;
setStoredValue(valueToStore);
window.localStorage.setItem(key, JSON.stringify(valueToStore));
} catch (err) {
console.error(err);
}
};
return [storedValue, setValue];
};
export { useLocalStorage };
type LocalStateContextType = {
timerSettings: TimerTypes,
setTimerSettings: Function,
playlist: string[],
setPlaylist: Function,
timer: timerType,
setTimer: Function,
timeRemaining: number,
setTimeRemaining: Function,
status?: Status,
setStatus: Function,
endTime: number,
setEndTime: Function
}
export const LocalStateContext = createContext<LocalStateContextType>({
timerSettings: defaultTimers,
playlist: initialPlaylist,
timer: defaultTimers[initialPlaylist[0]],
timeRemaining: defaultTimers[initialPlaylist[0]].duration,
endTime: 0,
setTimerSettings: () => console.warn("no local state yet"),
setPlaylist: () => console.warn("no local state yet"),
setTimer: () => console.warn("no local state yet"),
setTimeRemaining: () => console.warn("no local state yet"),
setStatus: () => console.warn("no local state yet"),
setEndTime: () => console.warn("no local state yet")
});
export const LocalStorageStateProvider = LocalStateContext.Provider;
export default function LocalStorageProvider({ children }: { children: ReactNode }) {
const [timerSettingsStored, setTimerSettingsStored] = useLocalStorage("timers", defaultTimers)
const [timerSettings, _setTimerSettings] = useState<TimerTypes>(defaultTimers)
const setTimerSettings = (timerSettings: TimerTypes) => {
setTimerSettingsStored(timerSettings)
_setTimerSettings(timerSettings)
}
const [playlistStored, setPlaylistStored] = useLocalStorage("playlist", initialPlaylist)
const [playlist, _setPlaylist] = useState<string[]>(initialPlaylist)
const setPlaylist = (playlist: string[]) => {
setPlaylistStored(playlist)
_setPlaylist(playlist)
}
const [timerStored, setTimerStored] = useLocalStorage("timer", timerSettings[playlist[0]])
const [timer, _setTimer] = useState<timerType>(timerSettings[playlist[0]])
const setTimer = (timer: timerType) => {
setTimerStored(timer)
_setTimer(timer)
}
const [timeRemainingStored, setTimeRemainingStored] = useLocalStorage("timeRemaining", timer.duration)
const [timeRemaining, _setTimeRemaining] = useState<number>(timer.duration)
const setTimeRemaining = (timeRemaining: number) => {
setTimeRemainingStored(timeRemaining)
_setTimeRemaining(timeRemaining)
}
const [statusStored, setStatusStored] = useLocalStorage("status", Status.Start)
const [status, _setStatus] = useState<Status>(Status.Start)
const setStatus = (status: Status) => {
setStatusStored(status)
_setStatus(status)
}
const [endTimeStored, setEndTimeStored] = useLocalStorage("endTime", 0)
const [endTime, _setEndTime] = useState<number>(0)
const setEndTime = (endTime: number) => {
setEndTimeStored(endTime)
_setEndTime(endTime)
}
//initializing all the variables with their LocalStorage counterparts.
useEffect(() => {
_setTimerSettings(timerSettingsStored)
_setPlaylist(playlistStored)
_setTimer(timerStored)
_setTimeRemaining(timeRemainingStored)
_setStatus(statusStored)
_setEndTime(endTimeStored)
}, [])
return <LocalStorageStateProvider value={
{
timerSettings, setTimerSettings, playlist, setPlaylist, timer, setTimer, timeRemaining, setTimeRemaining, status, setStatus, endTime, setEndTime
}
}>
{children}</LocalStorageStateProvider>
}
function useLocalStorageState() {
const all = useContext(LocalStateContext);
return all;
}
export { LocalStorageProvider, useLocalStorageState };