Google auth done
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Roman Krček
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.github/core-instructions.md
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# Copilot Instruction Set – **Google‑Sheet → Photo‑PDF** Wizard (SvelteKit)
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> **Goal**
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> A privacy‑first SvelteKit SPA that guides a user through importing a Google Sheet, mapping its columns, validating/culling rows, reviewing & cropping photos, and finally exporting two A4‑PDFs (text sheet + photo sheet). No personal data ever leaves the browser after the tab closes.
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---
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## 0. Tech Stack & Design Constraints
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| Area | Decision |
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| ---------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
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| Front‑end | **SvelteKit** (latest) – SPA mode (`prerender = false`) |
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| State | **Svelte Stores** (writable & derived). No persistence beyond sessionStorage/IndexedDB. |
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| Styling | **Tailwind CSS** + `@tailwind/typography`, base theme. Page background `bg-gray-50`. Use DaisyUI or shadcn‑ui components if needed. |
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| Auth & API | Google Identity Services (popup flow). Scopes: `spreadsheets`, `drive` (read/write). |
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| Data storage | • Structured data → **IndexedDB** via `idb` helper. |
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| • Image blobs → **Cache Storage** (`caches.open'photos-v1') a | |
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| Face detection | **Mediapipe BlazeFace via TF.js (lite)** in a Web Worker. Confidence ≥ 0.8. |
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| Virtual list | `svelte-virtual` (react‑window equivalent). |
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| PDF | **pdf-lib** (via ESM import). Embed custom font **Lato** (ttf provided in `/static/fonts`). |
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---
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## 1. User Stories & Acceptance Criteria
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1. **US‑01 Splash** – As a visitor I see a logo + “Start” button (no data loaded). Clicking starts the wizard.
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2. **US‑02 Sign‑In** – I authenticate with Google in a popup and grant the requested scopes. On success, token is cached in memory only.
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3. **US‑03 Sheet Search** – I type part of a Sheet name; a fuzzy list of my sheets appears (max 20). I select one.
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4. **US‑04 Column Mapping** – Columns A–F preview (first 3 data rows). Under each header is a dropdown: Name / Surname / Nationality / Birthday / Picture URL / Ignore. All five fields must be mapped exactly once. Previous mapping is remembered for future sessions in `localStorage` (key: `columnHints`).
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5. **US‑05 Row Validate & Select** – I see rows in a virtualized table with validation states. Invalid rows (missing data, age < 18 or > 40) are pre‑flagged. I can tick checkboxes to include/exclude. No in‑app editing.
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6. **US‑06 Photo Gallery** – Lazy virtual grid of thumbnails. Auto face‑crop overlay (dashed rectangle). Pictures with 0 or >1 faces are floated to top & flagged “Need manual crop”. I can drag/resize a fixed‑ratio rectangle to override. Cropped area is stored as `{x,y,w,h}` in store.
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7. **US‑07 Progress** – While downloading or processing images / faces, I see a determinate progress bar (0‑100%). Each stage (download, face detect, PDF gen).
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8. **US‑08 Generate PDFs** – I click “Generate”. Two PDFs download:
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* `people_data.pdf` – text‑only; grid fills as many boxes per A4 as fit (auto calculate cols/rows). Each box uses provided coordinates (see §4).
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* `people_photos.pdf` – same grid but with cropped headshot @ modest DPI, name beneath.
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9. **US‑09 Cleanup** – On window/tab unload, all IndexedDB records and CacheStorage entries are cleared.
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---
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## 2. Component Tree (Svelte)
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```
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+Layout.svelte (Tailwind container)
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├─ Splash.svelte
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├─ Wizard.svelte (stateful)
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├─ StepAuth.svelte
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├─ StepSheetSearch.svelte
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├─ StepColumnMap.svelte
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├─ StepRowFilter.svelte
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├─ StepGallery.svelte
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└─ StepGenerate.svelte
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```
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### Shared Stores (`src/lib/stores.ts`)
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```ts
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export const session = writable<{
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token?: string;
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user?: { name: string; email: string };
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}>({});
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export const sheetData = writable<RowData[]>(); // after mapping
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export const pictures = writable<Record<RowID, PictureBlobInfo>>();
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export const cropRects = writable<Record<RowID, Crop>>();
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```
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---
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## 3. Data Flow
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1. **Auth** ⇒ `session.token` set.
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2. **Sheet fetch** (Google Sheets API) ⇒ raw 2D array.
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3. **Mapping** ⇒ transform to `RowData` objects.
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4. **Validation** ⇒ add `valid` flag; excluded rows removed from downstream.
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5. **Download IMG** (Drive/HTTP) ⇒ cache → `pictures` store.
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6. **Face Detect** (Worker) ⇒ proposed crop rectangle.
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7. **Manual Crop** ⇒ update `cropRects`.
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8. **Generate PDFs** ⇒ read `RowData`, `pictures`, `cropRects`.
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---
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## 4. PDF Layout Spec (mm → points helper)
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* **Font**: Lato Regular, 10 pt. Embed once per doc via `pdfDoc.embedFont()`.
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* **Grid**: auto compute `colWidth = 70 mm`, `rowHeight = 35 mm` for text; `imageBox = 30 mm × 30 mm` centred.
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* **Coordinates (text sheet)** – within each cell (0,0 is cell top‑left):
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* Full Name – x 5 mm, y 5 mm
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* Nationality – x 5 mm, y 12 mm
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* Birthday – x 5 mm, y 19 mm
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* **Coordinates (photo sheet)**
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* Image top‑left x 5 mm, y 5 mm (square)
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* Name text centre below at y (5 + imageBox + 3 mm)
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* Fit rows top→bottom, left→right. When page full, add new page.
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---
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## 5. Key Helpers
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### `googleClient.ts`
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* `initAuth(): Promise<Token>`
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* `listSheets(query): Promise<SheetMeta[]>` (fuzzy)
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* `getSheetValues(id, range): Promise<string[][]>`
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### `faceWorker.ts` (Web Worker)
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* Loads BlazeFace lite model once.
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* `detectFaces(arrayBuffer) → {faces: Face[], blobURL}`
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### `pdfGenerator.ts`
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* `generateTextPDF(rows: RowData[]): Uint8Array`
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* `generatePhotoPDF(rows: RowData[], crops: CropMap): Uint8Array`
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---
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## 6. Progress Bus (simple derived store)
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```ts
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export const progress = writable<{ stage: string; done: number; total: number }>();
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```
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Set from download loop and face detect worker.
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---
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## 7. Error Handling
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* Auth popup closed ⇒ toast “Sign‑in cancelled”.
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* Sheet fetch 404 ⇒ return to StepSheetSearch with error banner.
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* Image download error ⇒ mark row `pictureError = true`, bubble to top.
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---
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## 8. Folder Structure Skeleton
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```
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src/
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lib/
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stores.ts
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googleClient.ts
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faceWorker.ts
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pdfGenerator.ts
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routes/
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+layout.svelte
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index.svelte (Splash)
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wizard/
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+page.svelte (mount Wizard.svelte)
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components/ (each Step*.svelte)
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workers/
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faceWorker.js
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static/
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fonts/Lato-Regular.ttf
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```
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---
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## 9. Copilot Prompt Comments (templates)
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### Example: `googleClient.ts`
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```ts
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/**
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* Google API wrapper – Browser‑only, no refresh tokens.
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* Prereqs: `<script src="https://accounts.google.com/gsi/client" async defer></script>` in root.
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*
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* Helper responsibilities:
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* 1. Launch popup OAuth (scopes: spreadsheets, drive).
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* 2. List up to 20 spreadsheets matching fuzzy query.
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* 3. Download a specified range (A:Z) as 2‑D array.
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* 4. Use in‑memory token, auto‑refresh not required.
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*/
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```
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### Example: `StepGallery.svelte`
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```svelte
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<script lang="ts">
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/**
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* Renders a virtual grid of downloaded photos.
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* Highlights items needing manual crop (no face/multiple faces).
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* When user drags the crop rectangle:
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* – Persist to cropRects store.
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* – Overlay rectangle turns green (valid).
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*/
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</script>
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```
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Copy‑paste these comment headers into the top of each file to prime GitHub Copilot with context.
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---
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## 10. Outstanding TODOs (owner = you)
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* [ ] Provide exact mm → point conversion util if different spec required.
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* [ ] Supply precise image/text box sizes & page margins.
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* [ ] Drop in `Lato-Regular.ttf` into `/static/fonts`.
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* [ ] Decide on logo / brand in Splash.
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* [ ] Accessibility pass once UI stabilises.
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---
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### End of base instruction set
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Feel free to ask for tweaks or deeper code snippets!
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