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<script lang="ts">
import { flashair } from '../flashair';
import type { FlashAirFileEntry } from '../flashair';
interface Props {
file: FlashAirFileEntry | undefined;
}
let { file }: Props = $props();
let thumbnailUrl = $derived(
file !== undefined ? flashair.thumbnailUrl(file.path) : undefined,
);
let fullObjectUrl = $state<string | undefined>(undefined);
let progress = $state(0);
let downloading = $state(false);
let loadError = $state<string | undefined>(undefined);
let currentAbort: AbortController | undefined;
/**
* Plain (non-reactive) mirror of fullObjectUrl so we can revoke it
* without reading the $state variable inside $effect (which would
* add it as a tracked dependency and cause an infinite loop).
*/
let rawObjectUrl: string | undefined;
$effect(() => {
const currentFile = file;
if (currentFile === undefined) {
cleanup();
return;
}
loadFullImage(currentFile);
return () => {
if (currentAbort !== undefined) {
currentAbort.abort();
currentAbort = undefined;
}
};
});
function cleanup() {
if (rawObjectUrl !== undefined) {
URL.revokeObjectURL(rawObjectUrl);
rawObjectUrl = undefined;
}
fullObjectUrl = undefined;
progress = 0;
downloading = false;
loadError = undefined;
}
async function loadFullImage(entry: FlashAirFileEntry) {
cleanup();
if (currentAbort !== undefined) {
currentAbort.abort();
}
const abort = new AbortController();
currentAbort = abort;
downloading = true;
progress = 0;
loadError = undefined;
const url = flashair.fileUrl(entry.path);
const totalBytes = entry.size;
try {
const res = await fetch(url, { signal: abort.signal });
if (!res.ok) {
throw new Error(`${res.status} ${res.statusText}`);
}
const reader = res.body?.getReader();
if (reader === undefined) {
const blob = await res.blob();
if (abort.signal.aborted) return;
const objectUrl = URL.createObjectURL(blob);
rawObjectUrl = objectUrl;
fullObjectUrl = objectUrl;
progress = 1;
downloading = false;
return;
}
const chunks: Uint8Array[] = [];
let received = 0;
while (true) {
const { done, value } = await reader.read();
if (done) break;
chunks.push(value);
received += value.byteLength;
progress = totalBytes > 0 ? received / totalBytes : 0;
}
if (abort.signal.aborted) return;
const blob = new Blob(chunks);
const objectUrl = URL.createObjectURL(blob);
rawObjectUrl = objectUrl;
fullObjectUrl = objectUrl;
progress = 1;
} catch (e) {
if (abort.signal.aborted) return;
loadError = e instanceof Error ? e.message : String(e);
} finally {
if (!abort.signal.aborted) {
downloading = false;
}
}
}
let progressPercent = $derived(Math.round(progress * 100));
let showThumbnail = $derived(fullObjectUrl === undefined && thumbnailUrl !== undefined);
</script>
<div class="h-full flex items-center justify-center bg-base-300 relative">
{#if file === undefined}
<div class="text-base-content/40 text-center p-8">
<p class="text-lg">Select a photo to preview</p>
</div>
{:else if loadError !== undefined}
<div class="text-center p-8">
<p class="text-error mb-2">Failed to load image</p>
<p class="text-sm text-base-content/60">{loadError}</p>
</div>
{:else}
{#if downloading && progress < 1}
<div class="absolute inset-x-0 top-0 z-10 p-3">
<div class="max-w-xs mx-auto">
<div class="flex items-center gap-2">
<progress class="progress progress-primary flex-1" value={progressPercent} max="100"></progress>
<span class="text-xs font-mono text-base-content/70 w-10 text-right">{progressPercent}%</span>
</div>
</div>
</div>
{/if}
{#if fullObjectUrl !== undefined}
{#key fullObjectUrl}
<img
src={fullObjectUrl}
alt={file.filename}
class="max-w-full max-h-full object-contain"
/>
{/key}
{:else if showThumbnail}
<img
src={thumbnailUrl}
alt={file.filename}
class="max-w-full max-h-full object-contain image-rendering-pixelated"
style="image-rendering: pixelated;"
/>
{:else}
<span class="loading loading-spinner loading-lg"></span>
{/if}
{/if}
</div>
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