From c1eeb42f2166f0e32a727c0f402a6e1cf47877c3 Mon Sep 17 00:00:00 2001
From: Julien Oculi <xdrz.jot.sr@gmail.com>
Date: Tue, 2 Jul 2024 13:52:41 +0200
Subject: [PATCH] feat(island): :sparkles: add `BlogCardList` to fetch and
 display news progressively

---
 islands/BlogCardList.tsx | 89 ++++++++++++++++++++++++++++++++++++++++
 routes/blog/index.tsx    |  4 +-
 2 files changed, 91 insertions(+), 2 deletions(-)
 create mode 100644 islands/BlogCardList.tsx

diff --git a/islands/BlogCardList.tsx b/islands/BlogCardList.tsx
new file mode 100644
index 0000000..d64ee56
--- /dev/null
+++ b/islands/BlogCardList.tsx
@@ -0,0 +1,89 @@
+import { BlogCard, BlogProps } from ':components/BlogBlocks.tsx'
+import Suspense from ':islands/Suspens.tsx'
+import { requestApiStream } from ':src/utils.ts'
+import { Signal, useSignal } from '@preact/signals'
+import type { JSX } from 'preact'
+import { useEffect } from 'preact/hooks'
+
+function fillList(
+    list: Signal<JSX.Element[]>,
+    { limit, ac }: { limit?: number; ac?: AbortController },
+) {
+    ;(async () => {
+        const newsList = requestApiStream<void, BlogProps>(
+            'news/fetchAll',
+            'GET',
+        )
+
+        for await (const news of newsList) {
+            list.value = [
+                ...list.value,
+                BlogCard({ ...news, lastUpdate: new Date(news.lastUpdate) }),
+            ]
+            if (limit && list.value.length >= limit) break
+        }
+        ac?.abort()
+    })()
+}
+
+export default function BlogCardList(
+    { limit, usePlaceholder }: { usePlaceholder?: boolean; limit?: number },
+) {
+    const list = useSignal<JSX.Element[]>([])
+    const ac = new AbortController()
+
+    useEffect(() => {
+        fillList(list, { limit, ac })
+    })
+
+    if (limit && usePlaceholder) {
+        const placeholders = Array
+            .from({ length: limit })
+            .map((_, index) => (
+                <Suspense
+                    loader={<Placeholder />}
+                    fallback={Fallback}
+                    signal={ac.signal}
+                >
+                    {updateFromList(list, index)}
+                </Suspense>
+            ))
+        return <>{placeholders}</>
+    }
+
+    return <>{list}</>
+}
+
+function Placeholder() {
+    return (
+        <div class='components__blog_block components__blog_block--card components__blog_block--placeholder'>
+            <h3>Chargement ...</h3>
+        </div>
+    )
+}
+
+function Fallback() {
+    return (
+        <div
+            class='components__blog_block components__blog_block--card components__blog_block--fallback'
+            inert
+        >
+            <h3>Pas de news disponible</h3>
+        </div>
+    )
+}
+
+function updateFromList(
+    list: Signal<JSX.Element[]>,
+    index: number,
+): Promise<JSX.Element> {
+    const { promise, resolve } = Promise.withResolvers<JSX.Element>()
+    list.subscribe((value) => {
+        const selected = value.at(index)
+        if (selected) {
+            resolve(selected)
+        }
+    })
+
+    return promise
+}
diff --git a/routes/blog/index.tsx b/routes/blog/index.tsx
index d7dbae8..811e2b5 100644
--- a/routes/blog/index.tsx
+++ b/routes/blog/index.tsx
@@ -1,12 +1,12 @@
 import { AutoGrid } from ':components/AutoGrid.tsx'
-import { BlogCard, blogMock } from ':components/BlogCard.tsx'
+import BlogCardList from ':islands/BlogCardList.tsx'
 
 export default function Blog() {
 	return (
 		<>
 			<h1>Nos articles</h1>
 			<AutoGrid columnWidth='15rem'>
-				{blogMock.map(BlogCard)}
+				<BlogCardList />
 			</AutoGrid>
 		</>
 	)