✨ feat(server): /api/info aggregator + frontend version footer (#40)

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

frontend/app.vue

@@ -1,3 +1,5 @@
 <template>
-  <NuxtPage />
+  <NuxtLayout>
+    <NuxtPage />
+  </NuxtLayout>
 </template>

frontend/components/AppFooter.vue

@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import AppFooterView, { type AppInfo } from './AppFooterView.vue'
+
+// Wrapper: handles data fetching, delegates rendering to AppFooterView.
+// Separation of concerns (SRP) - same pattern as HealthDashboard / HealthDashboardView.
+// server: false → fetch client-side only. Avoids SSR fetching through the dev proxy
+// (which can fail in some local setups), and lets Playwright route mocks apply.
+const { data, pending, error } = useFetch<AppInfo>('/api/info', { server: false })
+</script>
+
+<template>
+  <AppFooterView :data="data" :pending="pending" :error="error" />
+</template>

frontend/components/AppFooterView.vue

@@ -0,0 +1,45 @@
+<script setup lang="ts">
+import { humaniseUptime } from '~/utils/uptime'
+
+export interface AppInfo {
+  version: string
+  commit_short: string
+  build_date: string
+  uptime_seconds: number
+  cache_enabled: boolean
+  healthz_status: string
+}
+
+defineProps<{
+  data: AppInfo | null | undefined
+  pending: boolean
+  error: { message: string } | null | undefined
+}>()
+</script>
+
+<template>
+  <footer data-testid="app-footer">
+    <p v-if="pending" data-testid="app-footer-pending">v?</p>
+    <p v-else-if="error" data-testid="app-footer-error">v? · info unavailable</p>
+    <p v-else-if="data" data-testid="app-footer-info">
+      <span data-testid="app-footer-version">v{{ data.version }}</span>
+      <span> · commit </span>
+      <span data-testid="app-footer-commit">{{ data.commit_short }}</span>
+      <span> · uptime </span>
+      <span data-testid="app-footer-uptime">{{ humaniseUptime(data.uptime_seconds) }}</span>
+    </p>
+  </footer>
+</template>
+
+<style scoped>
+footer {
+  border-top: 1px solid #ccc;
+  padding: 0.5rem 1rem;
+  font-size: 0.85rem;
+  color: #555;
+  text-align: center;
+}
+footer p {
+  margin: 0;
+}
+</style>

frontend/layouts/default.vue

@@ -0,0 +1,17 @@
+<template>
+  <div class="layout-root">
+    <slot />
+    <AppFooter />
+  </div>
+</template>
+
+<style scoped>
+.layout-root {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+}
+.layout-root > :first-child {
+  flex: 1;
+}
+</style>

frontend/tests/e2e/app-footer.spec.ts

@@ -0,0 +1,67 @@
+import { test, expect } from '@playwright/test'
+
+// Both specs mock /api/info so they decouple from the dev-proxy plumbing.
+// The integration with the real backend is covered by the BDD scenario in
+// features/info/info.feature (server-side, no frontend proxy in the loop).
+
+test('home page footer shows version, commit and uptime', async ({ page }) => {
+  await page.route('**/api/info', (route) => {
+    route.fulfill({
+      status: 200,
+      contentType: 'application/json',
+      body: JSON.stringify({
+        version: '1.4.0',
+        commit_short: '4a3f1bb',
+        build_date: '2026-05-05T00:00:00Z',
+        uptime_seconds: 8042,
+        cache_enabled: true,
+        healthz_status: 'healthy',
+      }),
+    })
+  })
+  await page.goto('/')
+
+  // Footer is mounted globally via layouts/default.vue
+  await expect(page.getByTestId('app-footer')).toBeVisible()
+
+  // The PR #32 lesson: assert content, not just visibility.
+  // Without the regex check the test would PASS even if the footer rendered the
+  // pending placeholder ("v?") indefinitely.
+  await expect(page.getByTestId('app-footer-info')).toBeVisible()
+  const versionLocator = page.getByTestId('app-footer-version')
+  await expect(versionLocator).toBeVisible()
+  await expect(versionLocator).toHaveText(/^v\d+\.\d+\.\d+$/)
+
+  // Commit and uptime should be present and non-empty.
+  await expect(page.getByTestId('app-footer-commit')).not.toBeEmpty()
+  await expect(page.getByTestId('app-footer-uptime')).not.toBeEmpty()
+
+  await page.screenshot({
+    path: 'tests/e2e/screenshots/app-footer-shows-version-commit-uptime.png',
+    fullPage: true,
+  })
+})
+
+// Regression spec: documents the expected error UX so we don't ship a silent failure.
+// Routes /api/info to a 502 mock so the test is reproducible regardless of backend.
+test('home page footer surfaces info endpoint errors gracefully', async ({ page }) => {
+  await page.route('**/api/info', (route) => {
+    route.fulfill({
+      status: 502,
+      contentType: 'application/json',
+      body: JSON.stringify({ error: 'simulated_backend_down' }),
+    })
+  })
+  await page.goto('/')
+
+  // Footer must NOT crash the page
+  await expect(page.getByTestId('app-footer')).toBeVisible()
+  await expect(page.getByTestId('app-footer-error')).toBeVisible()
+  // The error placeholder should NOT contain a real version pattern
+  await expect(page.getByTestId('app-footer-info')).not.toBeVisible()
+
+  await page.screenshot({
+    path: 'tests/e2e/screenshots/app-footer-surfaces-info-endpoint-errors-gracefully.png',
+    fullPage: true,
+  })
+})

frontend/utils/uptime.ts

@@ -0,0 +1,16 @@
+// Convert a duration in seconds to a humanised string like "2h 13m" or "45m 12s".
+// Returns "?" for non-finite or negative input so the UI never renders NaN/empty.
+export function humaniseUptime(seconds: number | null | undefined): string {
+  if (seconds == null || !Number.isFinite(seconds) || seconds < 0) return '?'
+
+  const s = Math.floor(seconds)
+  const days = Math.floor(s / 86400)
+  const hours = Math.floor((s % 86400) / 3600)
+  const minutes = Math.floor((s % 3600) / 60)
+  const secs = s % 60
+
+  if (days > 0) return `${days}d ${hours}h`
+  if (hours > 0) return `${hours}h ${minutes}m`
+  if (minutes > 0) return `${minutes}m ${secs}s`
+  return `${secs}s`
+}