Composer update (react-query refactor) (#1899)

* Move composer state to a context

* Rework composer to use RQ

---------

Co-authored-by: Eric Bailey <git@esb.lol>

src/state/queries/actor-autocomplete.ts

@@ -1,7 +1,8 @@
-import {AppBskyActorDefs} from '@atproto/api'
+import {AppBskyActorDefs, BskyAgent} from '@atproto/api'
 import {useQuery} from '@tanstack/react-query'
 import {useSession} from '../session'
 import {useMyFollowsQuery} from './my-follows'
+import AwaitLock from 'await-lock'
 
 export const RQKEY = (prefix: string) => ['actor-autocomplete', prefix]
 
@@ -21,6 +22,57 @@ export function useActorAutocompleteQuery(prefix: string) {
   })
 }
 
+export class ActorAutocomplete {
+  // state
+  isLoading = false
+  isActive = false
+  prefix = ''
+  lock = new AwaitLock()
+
+  // data
+  suggestions: AppBskyActorDefs.ProfileViewBasic[] = []
+
+  constructor(
+    public agent: BskyAgent,
+    public follows?: AppBskyActorDefs.ProfileViewBasic[] | undefined,
+  ) {}
+
+  setFollows(follows: AppBskyActorDefs.ProfileViewBasic[]) {
+    this.follows = follows
+  }
+
+  async query(prefix: string) {
+    const origPrefix = prefix.trim().toLocaleLowerCase()
+    this.prefix = origPrefix
+    await this.lock.acquireAsync()
+    try {
+      if (this.prefix) {
+        if (this.prefix !== origPrefix) {
+          return // another prefix was set before we got our chance
+        }
+
+        // start with follow results
+        this.suggestions = computeSuggestions(this.prefix, this.follows)
+
+        // ask backend
+        const res = await this.agent.searchActorsTypeahead({
+          term: this.prefix,
+          limit: 8,
+        })
+        this.suggestions = computeSuggestions(
+          this.prefix,
+          this.follows,
+          res.data.actors,
+        )
+      } else {
+        this.suggestions = computeSuggestions(this.prefix, this.follows)
+      }
+    } finally {
+      this.lock.release()
+    }
+  }
+}
+
 function computeSuggestions(
   prefix: string,
   follows: AppBskyActorDefs.ProfileViewBasic[] = [],