some change

src/app/feed/components/FeedView.ts

@@ -0,0 +1,36 @@
+import { useCallback, useRef, useState } from 'react'
+import { Post } from '../posts/posts.ts'
+
+const PageSize = 20
+
+export function useFeedViewModel(
+  loadMore: (cursor: string | null, amount: number) => Promise<Post[]>,
+) {
+  const [pages, setPages] = useState<Post[][]>([])
+  const [hasMore, setHasMore] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+
+  const cursor = useRef<string | null>(null)
+  const loading = useRef(false)
+
+  const loadNextPage = useCallback(async () => {
+    if (loading.current || !hasMore || error) return
+    loading.current = true
+
+    try {
+      const delay = new Promise((resolve) => setTimeout(resolve, 500))
+      const pagePromise = loadMore(cursor.current, PageSize)
+      const [page] = await Promise.all([pagePromise, delay])
+      setHasMore(page.length >= PageSize)
+      cursor.current = page.at(-1)?.postId ?? null
+      setPages((prev) => [...prev, page])
+    } catch (e: unknown) {
+      const err = e as Error
+      setError(err.message)
+    } finally {
+      loading.current = false
+    }
+  }, [loadMore, hasMore, error])
+
+  return { pages, setPages, loadNextPage, error } as const
+}

src/app/feed/components/FeedView.tsx

@@ -0,0 +1,29 @@
+import { useRef } from 'react'
+import { useIntersectionLoad } from '../../../hooks/useIntersectionLoad.ts'
+import { Post } from '../posts/posts.ts'
+import PostItem from './PostItem.tsx'
+
+interface FeedViewProps {
+  pages: Post[][]
+  onLoadMore: () => Promise<void>
+}
+
+export default function FeedView({ pages, onLoadMore }: FeedViewProps) {
+  const sentinelRef = useRef<HTMLDivElement | null>(null)
+  const posts = pages.flat()
+
+  useIntersectionLoad(onLoadMore, sentinelRef)
+
+  return (
+    <div className="w-full">
+      <div className="flex flex-col gap-6 w-full">
+        <div className="flex flex-col gap-6 w-full">
+          {posts.map((post) => (
+            <PostItem key={post.postId} post={post} />
+          ))}
+        </div>
+      </div>
+      <div ref={sentinelRef} className="h-1" />
+    </div>
+  )
+}

src/app/feed/components/PostItem.tsx

@@ -0,0 +1,69 @@
+import { Post, PostMedia } from '../posts/posts.ts'
+import { Link } from 'react-router-dom'
+import { useEffect, useState } from 'react'
+
+interface PostItemProps {
+  post: Post
+}
+
+export default function PostItem({ post }: PostItemProps) {
+  const formattedDate = post.createdAt.toLocaleString('en-US', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  })
+
+  const [visible, setVisible] = useState(false)
+
+  useEffect(() => {
+    const timeout = setTimeout(() => setVisible(true))
+    return () => {
+      clearTimeout(timeout)
+    }
+  }, [])
+
+  const opacity = visible ? 'opacity-100' : 'opacity-0'
+
+  return (
+    <article className={`w-full p-4 ${opacity} transition-opacity duration-500`} key={post.postId}>
+      <div className="text-sm text-gray-500 mb-3">
+        <Link to={`/u/${post.authorName}`} className="text-gray-400 hover:underline mr-2">
+          @{post.authorName}
+        </Link>
+        • {formattedDate}
+      </div>
+
+      <div className="text-gray-800 mb-4 whitespace-pre-wrap">{post.content}</div>
+
+      {post.media.length > 0 && (
+        <div className="grid gap-4 grid-cols-1">
+          {post.media.map((media) => (
+            <PostMediaItem key={media.url.toString()} media={media} />
+          ))}
+        </div>
+      )}
+    </article>
+  )
+}
+
+interface PostMediaProps {
+  media: PostMedia
+}
+
+function PostMediaItem({ media }: PostMediaProps) {
+  const url = media.url.toString()
+  const width = media.width ?? undefined
+  const height = media.height ?? undefined
+  return (
+    <img
+      width={width}
+      height={height}
+      src={url}
+      alt="todo sry :("
+      className="w-full h-auto"
+      loading="lazy"
+    />
+  )
+}

src/app/feed/pages/AuthorPage.tsx

@@ -0,0 +1,30 @@
+import { useCallback } from 'react'
+import FeedView from '../components/FeedView.tsx'
+import { PostsService } from '../posts/postsService.ts'
+import { useParams } from 'react-router-dom'
+import SingleColumnLayout from '../../../layouts/SingleColumnLayout.tsx'
+import NavBar from '../../../components/NavBar.tsx'
+import { useFeedViewModel } from '../components/FeedView.ts'
+
+interface AuthorPageParams {
+  postsService: PostsService
+}
+
+export default function AuthorPage({ postsService }: AuthorPageParams) {
+  const { username } = useParams()
+
+  const fetchPosts = useCallback(
+    async (cursor: string | null, amount: number | null) => {
+      return postsService.loadByAuthor(username!, cursor, amount)
+    },
+    [postsService, username],
+  )
+
+  const { pages, loadNextPage } = useFeedViewModel(fetchPosts)
+
+  return (
+    <SingleColumnLayout navbar={<NavBar />}>
+      <FeedView pages={pages} onLoadMore={loadNextPage} />
+    </SingleColumnLayout>
+  )
+}

src/app/feed/pages/HomePage.tsx

@@ -0,0 +1,70 @@
+import { useCallback, useState } from 'react'
+import FeedView from '../components/FeedView.tsx'
+import { PostsService } from '../posts/postsService.ts'
+import { useUser } from '../../user/userStore.ts'
+import { MediaService } from '../../media/mediaService.ts'
+import NewPostWidget from '../../../components/NewPostWidget.tsx'
+import { useFeedViewModel } from '../components/FeedView.ts'
+import { Post } from '../posts/posts.ts'
+import { Temporal } from '@js-temporal/polyfill'
+import SingleColumnLayout from '../../../layouts/SingleColumnLayout.tsx'
+import NavBar from '../../../components/NavBar.tsx'
+
+interface HomePageProps {
+  postsService: PostsService
+  mediaService: MediaService
+}
+
+export default function HomePage({ postsService, mediaService }: HomePageProps) {
+  const [user] = useUser()
+
+  const [isSubmitting, setIsSubmitting] = useState(false)
+
+  const fetchPosts = useCallback(
+    async (cursor: string | null, amount: number | null) => {
+      return postsService.loadPublicFeed(cursor, amount)
+    },
+    [postsService],
+  )
+
+  const { pages, setPages, loadNextPage } = useFeedViewModel(fetchPosts)
+
+  const onCreatePost = useCallback(
+    async (content: string, files: { file: File; width: number; height: number }[]) => {
+      setIsSubmitting(true)
+      if (user == null) throw new Error('Not logged in')
+      try {
+        const media = await Promise.all(
+          files.map(async ({ file, width, height }) => {
+            console.debug('do mediaService.uploadFile', file, 'width', width, 'height', height)
+            const { mediaId, url } = await mediaService.uploadFile(file)
+
+            return {
+              mediaId,
+              url,
+              width,
+              height,
+            }
+          }),
+        )
+        const postId = await postsService.createNew(user.userId, content, media)
+        const post = new Post(postId, content, media, Temporal.Now.instant(), user.username)
+        setPages((pages) => [[post], ...pages])
+      } catch (error) {
+        console.error('Failed to create post:', error)
+      } finally {
+        setIsSubmitting(false)
+      }
+    },
+    [mediaService, postsService, setPages, user],
+  )
+
+  return (
+    <SingleColumnLayout navbar={<NavBar />}>
+      <main className={`w-full max-w-3xl mx-auto`}>
+        <NewPostWidget onSubmit={onCreatePost} isSubmitting={isSubmitting} />
+        <FeedView pages={pages} onLoadMore={loadNextPage} />
+      </main>
+    </SingleColumnLayout>
+  )
+}

src/app/feed/posts/posts.ts

@@ -0,0 +1,49 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { components } from '../../api/schema.ts'
+
+export class Post {
+  public readonly postId: string
+  public readonly content: string
+  public readonly media: PostMedia[]
+  public readonly createdAt: Temporal.Instant
+  public readonly authorName: string
+
+  constructor(
+    postId: string,
+    content: string,
+    media: PostMedia[],
+    createdAt: string | Temporal.Instant,
+    authorName: string,
+  ) {
+    this.postId = postId
+    this.content = content
+    this.media = media
+    this.createdAt = Temporal.Instant.from(createdAt)
+    this.authorName = authorName
+  }
+
+  public static fromDto(dto: components['schemas']['PublicPostDto']): Post {
+    console.debug('make post', dto)
+    return new Post(
+      dto.postId,
+      dto.content,
+      dto.media.map((m) => new PostMediaImpl(new URL(m.url), m.width, m.height)),
+      Temporal.Instant.from(dto.createdAt),
+      dto.author.username,
+    )
+  }
+}
+
+export interface PostMedia {
+  readonly url: URL
+  readonly width: number | null
+  readonly height: number | null
+}
+
+class PostMediaImpl implements PostMedia {
+  constructor(
+    readonly url: URL,
+    readonly width: number | null,
+    readonly height: number | null,
+  ) {}
+}

src/app/feed/posts/postsService.ts

@@ -0,0 +1,62 @@
+import { Post } from './posts.ts'
+import client from '../../api/client.ts'
+
+export class PostsService {
+  constructor() {}
+
+  async createNew(authorId: string, content: string, media: CreatePostMedia[]): Promise<string> {
+    const response = await client.POST('/posts', {
+      body: {
+        authorId,
+        content,
+        media: media.map((m) => {
+          return { ...m, type: null, url: m.url.toString() }
+        }),
+      },
+      credentials: 'include',
+    })
+
+    if (!response.data) {
+      throw new Error('Failed to create post')
+    }
+
+    return response.data.postId
+  }
+
+  async loadPublicFeed(cursor: string | null, amount: number | null): Promise<Post[]> {
+    const response = await client.GET('/posts', {
+      query: { cursor, amount },
+      credentials: 'include',
+    })
+
+    if (!response.data) {
+      return []
+    }
+
+    return response.data?.posts.map((post) => Post.fromDto(post))
+  }
+
+  async loadByAuthor(
+    username: string,
+    cursor: string | null,
+    amount: number | null,
+  ): Promise<Post[]> {
+    const response = await client.GET('/posts', {
+      query: { cursor, amount, username },
+      credentials: 'include',
+    })
+
+    if (!response.data) {
+      return []
+    }
+
+    return response.data?.posts.map((post) => Post.fromDto(post))
+  }
+}
+
+interface CreatePostMedia {
+  mediaId: string
+  url: string | URL
+  width: number | null
+  height: number | null
+}