# ytplayer — project facts for agents

## What this is
Ad-free YouTube player. Three shells share `frontend/`: **web PWA** (Bun + Hono in
`server/`, the production deployment), Tauri (Windows), zero-native (Linux/macOS).
The PWA is what runs in production; `legacy/` holds the old native-only docs.

## Repo map

| Path | What lives there |
|------|------------------|
| `frontend/app.js` | The entire UI (~3.6k lines, no framework): player, playlists, search, settings, sync |
| `frontend/sw.js` + `frontend/sw-update.js` | Service worker + update flow (FRAGILE — see below) |
| `frontend/opfs.js` / `opfs-worker.js` | OPFS offline audio cache |
| `frontend/fingerprint.js` | Browser fingerprint used as the sync key |
| `frontend/async-guard.js` | Stale-async-response guard (unit-tested) |
| `server/server.js` | Bun + Hono backend — endpoint list is in its header comment |
| `server/db.js` | libsql schema/queries (`users`, `profiles`, `video_history`…) |
| `bin/yt-dlp` | Downloaded by `npm run setup`, gitignored |
| `scripts/` | icon generation, yt-dlp setup, push helper |
| `tests/` | Playwright e2e specs · unit tests live next to sources in `frontend/*.test.js` |
| `legacy/` | Old native-shell docs — do not treat as current |

API endpoints: `GET /api/search|channel|streams|download/:id|version|user/data|profile/load`,
`POST /api/user/sync|profile/create|profile/save`, `GET /sw.js` (BUILD_TAG-injected), `GET /*` static.
JSON shapes mirror the Tauri Rust bridge exactly — don't change one side alone.

## Local dev

```bash
npm run setup            # download bin/yt-dlp (once)
cd server && bun install
ln -s ../frontend public # once — the server serves ONLY ./public (Docker copies frontend/ there)
bun --hot server.js      # http://localhost:3000
node --test frontend/    # unit tests (run from repo root)
npx playwright test      # e2e (see Testing below)
```

Local DB file: `server/data/ytplayer.db` (gitignored). `BUILD_TAG` is computed from `./public` contents.

## Production deployment (web PWA)
- URL: **https://worship.hesed.sbs** (Traefik label in `docker-compose.yml`)
- Runs on the **homelab** Dokploy remote node; control plane is Dokploy on the VPS
  (`193.160.119.172`, API key in `~/development/.secrets/dokploy-api.env`).
- Compose ID: **`wprYCM8T51f7JtSHb983p`** (project `ytplayer`, env `production`).
- **Pushing to git does NOT deploy.** Trigger explicitly (build ≈ 5–6 min):
  ```bash
  ssh -i ~/.ssh/tmp_vps/dokploy_session root@193.160.119.172 \
    "curl -s -X POST -H 'x-api-key: $KEY' -H 'Content-Type: application/json' \
     -d '{\"composeId\":\"wprYCM8T51f7JtSHb983p\"}' http://localhost:3000/api/compose.deploy"
  # poll composeStatus via /api/compose.one?composeId=... until done|error
  ```
- Confirm the deploy landed: `curl https://worship.hesed.sbs/api/version` — the
  `buildTag` (content hash of every file under `./public`) must change.
- Homelab node is NOT always reachable on LAN; SSH via the VPS hop:
  `ssh root@193.160.119.172` → `ssh root@10.8.0.2` (WireGuard). Container name:
  `ytplayer-main-1dihzn-ytplayer-1`. DB: libsql file `/app/data/ytplayer.db`
  (query with `docker exec <c> bun -e '...' `using `@libsql/client`).

## Update-flow architecture (fragile — read before touching)
- `GET /sw.js` is served by the server with the real `BUILD_TAG` **injected by
  regex** over the fallback expression in `frontend/sw.js`. Never switch back to
  an exact-string replace: when the fallback literal was bumped (`v1.0.3`→`v1.0.4`)
  the exact match silently failed, the SW version froze, and **no client ever
  received another update** while `/api/version` kept announcing one — the
  "Update available keeps showing" bug.
- `BUILD_TAG` hashes **every** file under `./public` recursively. Don't reduce it
  to a file subset; a change to an unlisted shell file would stop busting caches.
- The update banner only shows when a waiting SW exists **and the page already
  has a controller** — a first install (fresh visit, or after Settings → Force
  refresh unregisters) passes through `waiting` transiently and must not banner.
- "Refresh UI" (`frontend/sw-update.js`): if no worker is waiting yet (banner came
  from the `/api/version` poll), it calls `reg.update()`, waits for `installed`,
  posts SKIP_WAITING, waits for `controllerchange`, then reloads once.

## Data model quirks
- Client state persists in localStorage key **`_ytpdata`** and syncs (debounced
  400 ms) to `POST /api/user/sync`, keyed by a browser fingerprint.
- **A-B loop markers are per-song-per-playlist**: stored on the playlist's own
  copy of the video (`entry.ab = {a, b}`) when playback source is that playlist;
  `data.abMarkers[videoId]` is only the fallback for non-playlist playback.
- **Online profiles** (`profiles` table, `/api/profile/*`): named cross-device
  sync where the lowercase profile NAME is the only credential (passkey-style,
  by design). Client stores `data.profile = {name, syncedAt}`; sync is
  last-write-wins — push debounced on every persist(), pull on app launch when
  the server's `updated_at` is newer than the local `syncedAt`.

## Testing
- Unit: `node --test frontend/` (sw, sw-update, async-guard).
- E2E: `npx playwright test` — WebKit iPhone-12 profile against a static serve of
  `frontend/` (needs `npx playwright install webkit`). A spurious update banner
  will make the settings-panel specs fail with `#modal intercepts pointer events`
  — that failure mode is a real app bug, not test flake.
- Test records on prod use `Probe */Recon *` names; clean via the container DB,
  children (`video_history`) first.

## Harness

Skills live in `.agents/skills/` (symlinked into `.claude/skills/`):
- **deploy-prod** — the Dokploy deploy + buildTag verification flow (manual-only; use for any "deploy"/"release" request).
- **mobile-app-ui-design** — UI/UX design work on the PWA screens.

## Commit rules
One changeset = one commit, single-line imperative message, **no AI attribution
of any kind** (global rule). `git push origin main` pushes to both remotes.