From bc42f35f8c76ddf1dc610b1fc5758efee560abd5 Mon Sep 17 00:00:00 2001
From: hsiegeln <37154749+hsiegeln@users.noreply.github.com>
Date: Tue, 21 Apr 2026 10:45:36 +0200
Subject: [PATCH] feat(client): PhotoUploadStore mit idle/loading/success/error

---
 src/lib/client/photo-upload.svelte.ts | 76 +++++++++++++++++++++++
 tests/unit/photo-upload-store.test.ts | 87 +++++++++++++++++++++++++++
 2 files changed, 163 insertions(+)
 create mode 100644 src/lib/client/photo-upload.svelte.ts
 create mode 100644 tests/unit/photo-upload-store.test.ts

diff --git a/src/lib/client/photo-upload.svelte.ts b/src/lib/client/photo-upload.svelte.ts
new file mode 100644
index 0000000..aaf0f48
--- /dev/null
+++ b/src/lib/client/photo-upload.svelte.ts
@@ -0,0 +1,76 @@
+import type { Recipe } from '$lib/types';
+
+export type UploadStatus = 'idle' | 'loading' | 'success' | 'error';
+
+export class PhotoUploadStore {
+  status = $state<UploadStatus>('idle');
+  recipe = $state<Recipe | null>(null);
+  errorCode = $state<string | null>(null);
+  errorMessage = $state<string | null>(null);
+  lastFile = $state<File | null>(null);
+
+  private controller: AbortController | null = null;
+  private readonly fetchImpl: typeof fetch;
+
+  constructor(opts: { fetchImpl?: typeof fetch } = {}) {
+    this.fetchImpl = opts.fetchImpl ?? fetch;
+  }
+
+  async upload(file: File): Promise<void> {
+    this.lastFile = file;
+    await this.doUpload(file);
+  }
+
+  async retry(): Promise<void> {
+    if (this.lastFile) await this.doUpload(this.lastFile);
+  }
+
+  reset(): void {
+    this.status = 'idle';
+    this.recipe = null;
+    this.errorCode = null;
+    this.errorMessage = null;
+    this.lastFile = null;
+    this.controller?.abort();
+    this.controller = null;
+  }
+
+  abort(): void {
+    this.controller?.abort();
+  }
+
+  private async doUpload(file: File): Promise<void> {
+    this.status = 'loading';
+    this.recipe = null;
+    this.errorCode = null;
+    this.errorMessage = null;
+    this.controller = new AbortController();
+    const fd = new FormData();
+    fd.append('photo', file);
+    try {
+      const res = await this.fetchImpl('/api/recipes/extract-from-photo', {
+        method: 'POST',
+        body: fd,
+        signal: this.controller.signal
+      });
+      const body = await res.json().catch(() => ({}));
+      if (!res.ok) {
+        this.status = 'error';
+        this.errorCode = typeof body.code === 'string' ? body.code : 'UNKNOWN';
+        this.errorMessage =
+          typeof body.message === 'string' ? body.message : `HTTP ${res.status}`;
+        return;
+      }
+      this.recipe = body.recipe as Recipe;
+      this.status = 'success';
+    } catch (e) {
+      if ((e as Error).name === 'AbortError') {
+        this.status = 'idle';
+        return;
+      }
+      this.status = 'error';
+      this.errorCode = 'NETWORK';
+      this.errorMessage = (e as Error).message;
+    }
+  }
+}
diff --git a/tests/unit/photo-upload-store.test.ts b/tests/unit/photo-upload-store.test.ts
new file mode 100644
index 0000000..3444034
--- /dev/null
+++ b/tests/unit/photo-upload-store.test.ts
@@ -0,0 +1,87 @@
+import { describe, it, expect, vi } from 'vitest';
+import { PhotoUploadStore } from '../../src/lib/client/photo-upload.svelte';
+
+const validRecipe = {
+  id: null,
+  title: 'T',
+  description: 'D',
+  source_url: null,
+  source_domain: null,
+  image_path: null,
+  servings_default: null,
+  servings_unit: null,
+  prep_time_min: null,
+  cook_time_min: null,
+  total_time_min: null,
+  cuisine: null,
+  category: null,
+  ingredients: [],
+  steps: [{ position: 1, text: 'S' }],
+  tags: []
+};
+
+function fakeFetch(responses: Response[]): typeof fetch {
+  let i = 0;
+  return vi.fn(async () => responses[i++]) as unknown as typeof fetch;
+}
+
+function mkFile(): File {
+  return new File([new Uint8Array([1, 2, 3])], 'x.jpg', { type: 'image/jpeg' });
+}
+
+describe('PhotoUploadStore', () => {
+  it('starts in idle', () => {
+    const s = new PhotoUploadStore();
+    expect(s.status).toBe('idle');
+  });
+
+  it('transitions loading → success on happy path', async () => {
+    const s = new PhotoUploadStore({
+      fetchImpl: fakeFetch([
+        new Response(JSON.stringify({ recipe: validRecipe }), { status: 200 })
+      ])
+    });
+    await s.upload(mkFile());
+    expect(s.status).toBe('success');
+    expect(s.recipe?.title).toBe('T');
+  });
+
+  it('transitions to error with code on 422', async () => {
+    const s = new PhotoUploadStore({
+      fetchImpl: fakeFetch([
+        new Response(
+          JSON.stringify({ code: 'NO_RECIPE_IN_IMAGE', message: 'nope' }),
+          { status: 422 }
+        )
+      ])
+    });
+    await s.upload(mkFile());
+    expect(s.status).toBe('error');
+    expect(s.errorCode).toBe('NO_RECIPE_IN_IMAGE');
+  });
+
+  it('reset() brings store back to idle', async () => {
+    const s = new PhotoUploadStore({
+      fetchImpl: fakeFetch([new Response('{"code":"X"}', { status: 503 })])
+    });
+    await s.upload(mkFile());
+    expect(s.status).toBe('error');
+    s.reset();
+    expect(s.status).toBe('idle');
+    expect(s.errorCode).toBeNull();
+    expect(s.lastFile).toBeNull();
+  });
+
+  it('retry re-uploads lastFile', async () => {
+    const s = new PhotoUploadStore({
+      fetchImpl: fakeFetch([
+        new Response('{"code":"X"}', { status: 503 }),
+        new Response(JSON.stringify({ recipe: validRecipe }), { status: 200 })
+      ])
+    });
+    await s.upload(mkFile());
+    expect(s.status).toBe('error');
+    await s.retry();
+    expect(s.status).toBe('success');
+  });
+});