feat(filter): remember filters, add localstorage hook and utils

src/hooks/index.ts

@@ -7,3 +7,4 @@ export * from './useNSFWList'
 export * from './useReactions'
 export * from './useNDKContext'
 export * from './useScrollDisable'
+export * from './useLocalStorage'

src/hooks/useLocalStorage.tsx

@@ -0,0 +1,50 @@
+import React from 'react'
+import {
+  getLocalStorageItem,
+  removeLocalStorageItem,
+  setLocalStorageItem
+} from 'utils'
+
+const useLocalStorageSubscribe = (callback: () => void) => {
+  window.addEventListener('storage', callback)
+  return () => window.removeEventListener('storage', callback)
+}
+
+export function useLocalStorage<T>(
+  key: string,
+  initialValue: T
+): [T, React.Dispatch<React.SetStateAction<T>>] {
+  const getSnapshot = () => getLocalStorageItem(key, initialValue)
+
+  const data = React.useSyncExternalStore(useLocalStorageSubscribe, getSnapshot)
+
+  const setState: React.Dispatch<React.SetStateAction<T>> = React.useCallback(
+    (v: React.SetStateAction<T>) => {
+      try {
+        const nextState =
+          typeof v === 'function'
+            ? (v as (prevState: T) => T)(JSON.parse(data))
+            : v
+
+        if (nextState === undefined || nextState === null) {
+          removeLocalStorageItem(key)
+        } else {
+          setLocalStorageItem(key, JSON.stringify(nextState))
+        }
+      } catch (e) {
+        console.warn(e)
+      }
+    },
+    [key, data]
+  )
+
+  React.useEffect(() => {
+    // Set local storage only when it's empty
+    const data = window.localStorage.getItem(key)
+    if (data === null) {
+      setLocalStorageItem(key, JSON.stringify(initialValue))
+    }
+  }, [key, initialValue])
+
+  return [JSON.parse(data) as T, setState]
+}

src/utils/consts.ts

@@ -0,0 +1,8 @@
+import { FilterOptions, SortBy, NSFWFilter, ModeratedFilter } from 'types'
+
+export const DEFAULT_FILTER_OPTIONS: FilterOptions = {
+  sort: SortBy.Latest,
+  nsfw: NSFWFilter.Hide_NSFW,
+  source: window.location.host,
+  moderated: ModeratedFilter.Moderated
+}

src/utils/index.ts

@@ -3,3 +3,5 @@ export * from './nostr'
 export * from './url'
 export * from './utils'
 export * from './zap'
+export * from './localStorage'
+export * from './consts'

src/utils/localStorage.ts

@@ -0,0 +1,32 @@
+export function getLocalStorageItem<T>(key: string, defaultValue: T): string {
+  try {
+    const data = window.localStorage.getItem(key)
+    if (data === null) return JSON.stringify(defaultValue)
+    return data
+  } catch (err) {
+    console.error(`Error while fetching local storage value: `, err)
+    return JSON.stringify(defaultValue)
+  }
+}
+
+export function setLocalStorageItem(key: string, value: string) {
+  try {
+    window.localStorage.setItem(key, value)
+    dispatchLocalStorageEvent(key, value)
+  } catch (err) {
+    console.error(`Error while saving local storage value: `, err)
+  }
+}
+
+export function removeLocalStorageItem(key: string) {
+  try {
+    window.localStorage.removeItem(key)
+    dispatchLocalStorageEvent(key, null)
+  } catch (err) {
+    console.error(`Error while deleting local storage value: `, err)
+  }
+}
+
+function dispatchLocalStorageEvent(key: string, newValue: string | null) {
+  window.dispatchEvent(new StorageEvent('storage', { key, newValue }))
+}