From 1bfd3e50842fdd511fc89d2b5892f8d440914cca Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Thu, 9 Apr 2026 19:28:44 +0900
Subject: caching of images

---
 src/lib/components/CachedThumbnail.svelte | 67 +++++++++++++++++++++++++++++++
 src/lib/components/ImageList.svelte       |  8 +---
 src/lib/components/ImagePreview.svelte    | 31 ++++++++++++++
 3 files changed, 100 insertions(+), 6 deletions(-)
 create mode 100644 src/lib/components/CachedThumbnail.svelte

(limited to 'src/lib/components')

diff --git a/src/lib/components/CachedThumbnail.svelte b/src/lib/components/CachedThumbnail.svelte
new file mode 100644
index 0000000..f0fe8bf
--- /dev/null
+++ b/src/lib/components/CachedThumbnail.svelte
@@ -0,0 +1,67 @@
+<script lang="ts">
+  import { flashair } from '../flashair';
+  import { imageCache } from '../cache';
+
+  interface Props {
+    path: string;
+    alt: string;
+  }
+
+  let { path, alt }: Props = $props();
+
+  let blobUrl = $state<string | undefined>(undefined);
+  let rawBlobUrl: string | undefined;
+
+  $effect(() => {
+    const currentPath = path;
+    blobUrl = undefined;
+
+    void loadThumbnail(currentPath);
+
+    return () => {
+      if (rawBlobUrl !== undefined) {
+        URL.revokeObjectURL(rawBlobUrl);
+        rawBlobUrl = undefined;
+      }
+    };
+  });
+
+  async function loadThumbnail(filePath: string) {
+    // Try cache first
+    const cached = await imageCache.get('thumbnail', filePath);
+    if (cached !== undefined) {
+      const url = URL.createObjectURL(cached.blob);
+      rawBlobUrl = url;
+      blobUrl = url;
+      return;
+    }
+
+    // Fetch from card
+    const thumbUrl = flashair.thumbnailUrl(filePath);
+    if (thumbUrl === undefined) return;
+
+    try {
+      const { blob, meta } = await flashair.fetchThumbnail(filePath);
+      // Store in cache (fire-and-forget)
+      void imageCache.put('thumbnail', filePath, blob, meta);
+      const url = URL.createObjectURL(blob);
+      rawBlobUrl = url;
+      blobUrl = url;
+    } catch {
+      // Thumbnail fetch failed — show placeholder
+    }
+  }
+</script>
+
+{#if blobUrl !== undefined}
+  <img
+    src={blobUrl}
+    {alt}
+    class="w-full aspect-square rounded object-cover"
+    draggable="false"
+  />
+{:else}
+  <div class="w-full aspect-square rounded bg-base-300 flex items-center justify-center">
+    <span class="loading loading-spinner loading-sm"></span>
+  </div>
+{/if}
diff --git a/src/lib/components/ImageList.svelte b/src/lib/components/ImageList.svelte
index f338670..532cd3b 100644
--- a/src/lib/components/ImageList.svelte
+++ b/src/lib/components/ImageList.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
   import { flashair } from '../flashair';
   import type { FlashAirFileEntry } from '../flashair';
+  import CachedThumbnail from './CachedThumbnail.svelte';
 
   interface Props {
     images: FlashAirFileEntry[];
@@ -29,12 +30,7 @@
             onclick={() => onSelect(file)}
           >
             {#if thumbUrl}
-              <img
-                src={thumbUrl}
-                alt={file.filename}
-                class="w-full aspect-square rounded object-cover"
-                loading="lazy"
-              />
+              <CachedThumbnail path={file.path} alt={file.filename} />
             {:else}
               <div class="w-full aspect-square rounded bg-base-300 flex items-center justify-center">
                 <span class="text-lg">🖼️</span>
diff --git a/src/lib/components/ImagePreview.svelte b/src/lib/components/ImagePreview.svelte
index 08be8ac..4a59d13 100644
--- a/src/lib/components/ImagePreview.svelte
+++ b/src/lib/components/ImagePreview.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
   import { flashair } from '../flashair';
   import type { FlashAirFileEntry } from '../flashair';
+  import { imageCache } from '../cache';
 
   interface Props {
     file: FlashAirFileEntry | undefined;
@@ -277,8 +278,23 @@
     const url = flashair.thumbnailUrl(entry.path);
     if (url === undefined) return;
 
+    // Try cache first
+    const cached = await imageCache.get('thumbnail', entry.path);
+    if (cached !== undefined) {
+      const blobUrl = URL.createObjectURL(cached.blob);
+      rawThumbnailUrl = blobUrl;
+      thumbnailBlobUrl = blobUrl;
+
+      if (cached.meta !== undefined && cached.meta.width !== undefined && cached.meta.height !== undefined && cached.meta.width > 0 && cached.meta.height > 0) {
+        imageAspectRatio = `${String(cached.meta.width)} / ${String(cached.meta.height)}`;
+      }
+      return;
+    }
+
     try {
       const { blob, meta } = await flashair.fetchThumbnail(entry.path);
+      // Store in cache (fire-and-forget)
+      void imageCache.put('thumbnail', entry.path, blob, meta);
       const blobUrl = URL.createObjectURL(blob);
       rawThumbnailUrl = blobUrl;
       thumbnailBlobUrl = blobUrl;
@@ -310,6 +326,17 @@
     progress = 0;
     loadError = undefined;
 
+    // Try cache first
+    const cached = await imageCache.get('full', entry.path);
+    if (cached !== undefined && !abort.signal.aborted) {
+      const objectUrl = URL.createObjectURL(cached.blob);
+      rawObjectUrl = objectUrl;
+      fullObjectUrl = objectUrl;
+      progress = 1;
+      downloading = false;
+      return;
+    }
+
     const url = flashair.fileUrl(entry.path);
     const totalBytes = entry.size;
 
@@ -323,6 +350,8 @@
       if (reader === undefined) {
         const blob = await res.blob();
         if (abort.signal.aborted) return;
+        // Store in cache (fire-and-forget)
+        void imageCache.put('full', entry.path, blob);
         const objectUrl = URL.createObjectURL(blob);
         rawObjectUrl = objectUrl;
         fullObjectUrl = objectUrl;
@@ -345,6 +374,8 @@
       if (abort.signal.aborted) return;
 
       const blob = new Blob(chunks);
+      // Store in cache (fire-and-forget)
+      void imageCache.put('full', entry.path, blob);
       const objectUrl = URL.createObjectURL(blob);
       rawObjectUrl = objectUrl;
       fullObjectUrl = objectUrl;
-- 
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