# Quickstart: UI Production Image

## Prerequisites

- Docker with BuildKit enabled (default in Docker 23+)
- `make` available in the shell

## Build the Image

```bash
make build-ui-prod
# Equivalent: docker build -f ui/Dockerfile.prod ui/ -t reactbin-ui-prod:latest
```

Expected: Build completes in ~2 minutes on first run (npm install), ~15 seconds on subsequent source-only changes.

## Run the Container

```bash
docker run --rm -p 4200:8080 reactbin-ui-prod:latest
```

Open http://localhost:4200 — the app shell loads. Navigate to `/library` or `/tags` — the page loads (SPA routing returns `index.html`).

## Verify All Production Checks

```bash
make verify-ui-prod
```

This runs `ui/tests/build/verify_production_image.sh`, which exercises all three user stories:

```
[verify] Building reactbin-ui-prod:verify-<PID>...
[verify] Build OK
[verify] Polling health endpoint...
[verify] Health check passed
[verify] SPA routing OK (/library → 200)
[verify] Non-root user OK (UID <n>)
[verify] Stdout logging OK
[verify] Graceful shutdown OK (exit 0)
[verify] Node.js absent in runtime image OK
[verify] No secrets in image layers OK
[verify] Dep layer cache hit confirmed (US3 OK)
[verify] All checks passed (US1 + US2 + US3).
```

## Integration Test Scenarios

### Scenario 1: Initial Build (Cold Cache)

```bash
docker rmi reactbin-ui-prod:latest 2>/dev/null || true
make build-ui-prod
```

Expected: `npm ci` runs fully (~30–90s depending on network). All packages installed from lockfile.

### Scenario 2: Source-Only Rebuild (Warm Cache)

```bash
touch ui/src/app/app.component.ts
make build-ui-prod
```

Expected: `npm ci` step is CACHED (skipped). Only the Angular compilation runs (~10–20s).

### Scenario 3: Dependency Change (Cache Invalidation)

```bash
# Simulate a lockfile change
touch ui/package-lock.json
make build-ui-prod
```

Expected: `npm ci` runs fresh (cache miss is intentional and correct).

### Scenario 4: SPA Deep-Link Routing

```bash
docker run --rm -d -p 4200:8080 --name ui-test reactbin-ui-prod:latest
curl -sf http://localhost:4200/library        # 200 + index.html
curl -sf http://localhost:4200/tags           # 200 + index.html
curl -sf http://localhost:4200/nonexistent    # 200 + index.html (Angular handles 404)
docker stop ui-test
```

### Scenario 5: Non-Root Assertion

```bash
docker run --rm reactbin-ui-prod:latest id
# Must NOT output uid=0(root)
```

### Scenario 6: No Node.js in Runtime Image

```bash
docker run --rm reactbin-ui-prod:latest node --version 2>&1
# Must exit non-zero (node not found)
```
