refactoring: seen context provider

src/components/App.tsx

@@ -12,6 +12,7 @@ import { InboxProvider } from '../context/inbox'
 import { LocalizeProvider } from '../context/localize'
 import { MediaQueryProvider } from '../context/mediaQuery'
 import { NotificationsProvider } from '../context/notifications'
+import { SeenProvider } from '../context/seen'
 import { SessionProvider } from '../context/session'
 import { SnackbarProvider } from '../context/snackbar'
 import { TopicsProvider } from '../context/topics'
@@ -115,6 +116,7 @@ export const App = (props: Props) => {
         <MediaQueryProvider>
           <SnackbarProvider>
             <TopicsProvider>
+              <SeenProvider>
                 <ConfirmProvider>
                   <SessionProvider onStateChangeCallback={console.log}>
                     <FollowingProvider>
@@ -130,6 +132,7 @@ export const App = (props: Props) => {
                     </FollowingProvider>
                   </SessionProvider>
                 </ConfirmProvider>
+              </SeenProvider>
             </TopicsProvider>
           </SnackbarProvider>
         </MediaQueryProvider>

src/components/Feed/Sidebar/Sidebar.tsx

@@ -4,18 +4,17 @@ import { For, Show, createSignal } from 'solid-js'
 
 import { useFollowing } from '../../../context/following'
 import { useLocalize } from '../../../context/localize'
+import { useSeen } from '../../../context/seen'
 import { Author } from '../../../graphql/schema/core.gen'
 import { router, useRouter } from '../../../stores/router'
 import { useArticlesStore } from '../../../stores/zine/articles'
-import { useSeenStore } from '../../../stores/zine/seen'
 import { Userpic } from '../../Author/Userpic'
 import { Icon } from '../../_shared/Icon'
-
 import styles from './Sidebar.module.scss'
 
 export const Sidebar = () => {
   const { t } = useLocalize()
-  const { seen } = useSeenStore()
+  const { seen } = useSeen()
   const { subscriptions } = useFollowing()
   const { page } = useRouter()
   const { articlesByTopic } = useArticlesStore()

src/context/seen.tsx

@@ -0,0 +1,67 @@
+import { openDB } from 'idb'
+import { Accessor, JSX, createContext, createSignal, onMount, useContext } from 'solid-js'
+
+type SeenContextType = {
+  seen: Accessor<{ [slug: string]: number }>
+  addSeen: (slug: string) => void
+}
+
+const SeenContext = createContext<SeenContextType>()
+export function useSeen() {
+  return useContext(SeenContext)
+}
+
+const DB_NAME = 'discourseAppDB'
+const DB_VERSION = 1
+const STORE_NAME = 'seen'
+const setupIndexedDB = async () => {
+  return await openDB(DB_NAME, DB_VERSION, {
+    upgrade(db) {
+      if (!db.objectStoreNames.contains(STORE_NAME)) {
+        db.createObjectStore(STORE_NAME, { keyPath: 'slug' })
+      }
+    },
+  })
+}
+
+const getSeenFromIndexedDB = async (db) => {
+  const tx = db.transaction(STORE_NAME, 'readonly')
+  const store = tx.objectStore(STORE_NAME)
+  const seen = await store.getAll()
+  return seen.reduce((acc, { slug, date }) => {
+    acc[slug] = date
+    return acc
+  }, {})
+}
+
+const saveSeenToIndexedDB = async (db, seen) => {
+  const tx = db.transaction(STORE_NAME, 'readwrite')
+  const store = tx.objectStore(STORE_NAME)
+  for (const [slug, date] of Object.entries(seen)) {
+    await store.put({ slug, date })
+  }
+  await tx.done
+}
+
+export const SeenProvider = (props: { children: JSX.Element }) => {
+  const [seen, setSeen] = createSignal<{ [slug: string]: number }>({})
+  const [db, setDb] = createSignal()
+  const addSeen = async (slug: string) => {
+    setSeen((prev) => {
+      const newSeen = { ...prev, [slug]: Date.now() }
+      saveSeenToIndexedDB(db(), newSeen)
+      return newSeen
+    })
+  }
+
+  onMount(async () => {
+    const ndb = await setupIndexedDB()
+    setDb(ndb)
+    const seenFromDB = await getSeenFromIndexedDB(ndb)
+    setSeen(seenFromDB)
+  })
+
+  const value: SeenContextType = { seen, addSeen }
+
+  return <SeenContext.Provider value={value}>{props.children}</SeenContext.Provider>
+}

src/stores/zine/seen.ts

@@ -1,15 +0,0 @@
-import { createStorageSignal } from '@solid-primitives/storage'
-
-// TODO: use indexedDB here
-export const [seen, setSeen] = createStorageSignal<{ [slug: string]: Date }>('seen', {})
-export const addSeen = (slug) => setSeen({ ...seen(), [slug]: Date.now() })
-
-export const useSeenStore = (initialData: { [slug: string]: Date } = {}) => {
-  setSeen({ ...seen(), ...initialData })
-
-  return {
-    seen,
-    setSeen,
-    addSeen,
-  }
-}