Implement scene member/memberships listings

src/state/models/members-view.ts

@@ -0,0 +1,110 @@
+import {makeAutoObservable} from 'mobx'
+import * as GetMembers from '../../third-party/api/src/client/types/app/bsky/graph/getMembers'
+import {RootStoreModel} from './root-store'
+
+type Subject = GetMembers.OutputSchema['subject']
+export type MemberItem = GetMembers.OutputSchema['members'][number] & {
+  _reactKey: string
+}
+
+export class MembersViewModel {
+  // state
+  isLoading = false
+  isRefreshing = false
+  hasLoaded = false
+  error = ''
+  params: GetMembers.QueryParams
+
+  // data
+  subject: Subject = {did: '', handle: '', displayName: ''}
+  members: MemberItem[] = []
+
+  constructor(
+    public rootStore: RootStoreModel,
+    params: GetMembers.QueryParams,
+  ) {
+    makeAutoObservable(
+      this,
+      {
+        rootStore: false,
+        params: false,
+      },
+      {autoBind: true},
+    )
+    this.params = params
+  }
+
+  get hasContent() {
+    return this.subject.did !== ''
+  }
+
+  get hasError() {
+    return this.error !== ''
+  }
+
+  get isEmpty() {
+    return this.hasLoaded && !this.hasContent
+  }
+
+  // public api
+  // =
+
+  async setup() {
+    await this._fetch()
+  }
+
+  async refresh() {
+    await this._fetch(true)
+  }
+
+  async loadMore() {
+    // TODO
+  }
+
+  // state transitions
+  // =
+
+  private _xLoading(isRefreshing = false) {
+    this.isLoading = true
+    this.isRefreshing = isRefreshing
+    this.error = ''
+  }
+
+  private _xIdle(err: string = '') {
+    this.isLoading = false
+    this.isRefreshing = false
+    this.hasLoaded = true
+    this.error = err
+  }
+
+  // loader functions
+  // =
+
+  private async _fetch(isRefreshing = false) {
+    this._xLoading(isRefreshing)
+    try {
+      const res = await this.rootStore.api.app.bsky.graph.getMembers(
+        this.params,
+      )
+      this._replaceAll(res)
+      this._xIdle()
+    } catch (e: any) {
+      this._xIdle(`Failed to load feed: ${e.toString()}`)
+    }
+  }
+
+  private _replaceAll(res: GetMembers.Response) {
+    this.subject.did = res.data.subject.did
+    this.subject.handle = res.data.subject.handle
+    this.subject.displayName = res.data.subject.displayName
+    this.members.length = 0
+    let counter = 0
+    for (const item of res.data.members) {
+      this._append({_reactKey: `item-${counter++}`, ...item})
+    }
+  }
+
+  private _append(item: MemberItem) {
+    this.members.push(item)
+  }
+}