mirror of https://dev.azure.com/globalhealthx/EMR/_git/helix-engage synced 2026-04-11 18:28:15 +00:00

Files

saridsa2 afd0829dc6 feat: design tokens — multi-hospital theming system

Backend (sidecar):
- ThemeService: read/write/backup/reset theme.json with versioning
- ThemeController: GET/PUT/POST /api/config/theme endpoints
- ConfigThemeModule registered in app

Frontend:
- ThemeTokenProvider: fetches theme, injects CSS variables on <html>
- Login page: logo, title, subtitle, Google/forgot toggles from tokens
- Sidebar: title, subtitle, active highlight from brand color scale
- AI chat: quick actions from tokens
- Branding settings page: 2-column layout, file upload for logo/favicon,
  single color picker with palette generation, font dropdowns, presets,
  pinned footer, versioning

Theme CSS:
- Sidebar active/hover text now references --color-brand-400

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-02 15:50:36 +05:30

7.5 KiB

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Design Tokens — Multi-Hospital Theming

Date: 2026-04-02 Status: Draft

Overview

A JSON-driven design token system that allows each hospital customer to rebrand Helix Engage by providing a single JSON configuration file. The JSON is served by the sidecar, consumed by the frontend at runtime via a React provider that injects CSS custom properties.

Architecture

Sidecar (helix-engage-server)
  └─ GET /api/config/theme → returns hospital theme JSON
  └─ theme stored as JSON file at data/theme.json (editable, hot-reloadable)

Frontend (helix-engage)
  └─ ThemeTokenProvider (wraps app) → fetches theme JSON on mount
  └─ Injects CSS custom properties on <html> element
  └─ Exposes useThemeTokens() hook for content tokens (logo, name, text)
  └─ Components read colors via existing Tailwind classes (no changes needed)

Theme JSON Schema

{
  "brand": {
    "name": "Helix Engage",
    "hospitalName": "Global Hospital",
    "logo": "/helix-logo.png",
    "favicon": "/favicon.ico"
  },
  "colors": {
    "brand": {
      "25": "rgb(239 246 255)",
      "50": "rgb(219 234 254)",
      "100": "rgb(191 219 254)",
      "200": "rgb(147 197 253)",
      "300": "rgb(96 165 250)",
      "400": "rgb(59 130 246)",
      "500": "rgb(37 99 235)",
      "600": "rgb(29 78 216)",
      "700": "rgb(30 64 175)",
      "800": "rgb(30 58 138)",
      "900": "rgb(23 37 84)",
      "950": "rgb(15 23 42)"
    }
  },
  "typography": {
    "body": "Satoshi, Inter, -apple-system, sans-serif",
    "display": "General Sans, Inter, -apple-system, sans-serif"
  },
  "login": {
    "title": "Sign in to Helix Engage",
    "subtitle": "Global Hospital",
    "showGoogleSignIn": true,
    "showForgotPassword": true,
    "poweredBy": {
      "label": "Powered by F0rty2.ai",
      "url": "https://f0rty2.ai"
    }
  },
  "sidebar": {
    "title": "Helix Engage",
    "subtitle": "Global Hospital · Call Center Agent"
  },
  "ai": {
    "quickActions": [
      { "label": "Doctor availability", "prompt": "What doctors are available?" },
      { "label": "Clinic timings", "prompt": "What are the clinic timings?" },
      { "label": "Patient history", "prompt": "Summarize this patient's history" },
      { "label": "Treatment packages", "prompt": "What packages are available?" }
    ]
  }
}

Sidecar Implementation

Endpoints

GET  /api/config/theme        — Returns theme JSON (no auth, public — needed before login)
PUT  /api/config/theme        — Updates theme JSON (auth required, admin only)
POST /api/config/theme/reset  — Resets to default theme (auth required, admin only)

Stored in data/theme.json on the sidecar filesystem
Cached in memory, invalidated on PUT
If file doesn't exist, returns a hardcoded default (Global Hospital theme)
PUT validates the JSON schema before saving
PUT also writes a timestamped backup to data/theme-backups/

Files

helix-engage-server/src/config/theme.controller.ts — REST endpoints
helix-engage-server/src/config/theme.service.ts — read/write/validate/backup logic

Frontend Implementation

ThemeTokenProvider

New provider wrapping the app in main.tsx. Responsibilities:

Fetch GET /api/config/theme on mount (before rendering anything)
Inject CSS variables on document.documentElement.style:
- --color-brand-25 through --color-brand-950 (overrides the Untitled UI brand scale)
- --font-body, --font-display (overrides typography)
Store content tokens in React context (brand name, logo, login text, sidebar text, quick actions)
Expose useThemeTokens() hook for components to read content tokens

File: `src/providers/theme-token-provider.tsx`

type ThemeTokens = {
  brand: { name: string; hospitalName: string; logo: string; favicon: string };
  login: { title: string; subtitle: string; showGoogleSignIn: boolean; showForgotPassword: boolean; poweredBy: { label: string; url: string } };
  sidebar: { title: string; subtitle: string };
  ai: { quickActions: Array<{ label: string; prompt: string }> };
};

CSS Variable Injection

The provider maps colors.brand.* to CSS custom properties that Untitled UI already reads:

theme.colors.brand["500"] → document.documentElement.style.setProperty('--color-brand-500', value)

Since theme.css defines --color-brand-500: var(--color-blue-500), setting --color-brand-500 directly on <html> overrides the alias with higher specificity.

Typography:

theme.typography.body → --font-body
theme.typography.display → --font-display

Consumers

Components that currently hardcode hospital-specific content:

Component	Current hardcoded value	Token path
`login.tsx` line 93	"Sign in to Helix Engage"	`login.title`
`login.tsx` line 94	"Global Hospital"	`login.subtitle`
`login.tsx` line 92	`/helix-logo.png`	`brand.logo`
`login.tsx` line 181	"Powered by F0rty2.ai"	`login.poweredBy.label`
`sidebar.tsx`	"Helix Engage"	`sidebar.title`
`sidebar.tsx`	"Global Hospital · Call Center Agent"	`sidebar.subtitle`
`ai-chat-panel.tsx` lines 21-25	Quick action prompts	`ai.quickActions`
`app-shell.tsx`	favicon	`brand.favicon`

Default Theme

If the sidecar returns no theme (endpoint down, file missing), the frontend uses a hardcoded default matching the current Global Hospital branding. This ensures the app works without a sidecar theme endpoint.

Settings UI (Supervisor)

New tab in the Settings page: Branding. Visible only to admin role.

Sections

1. Brand Identity

Hospital name (text input)
App name (text input)
Logo upload (file input → stores URL)
Favicon upload

2. Brand Colors

12 color swatches (25 through 950) with hex/rgb input per swatch
Live preview strip showing the full scale
"Reset to default" button per section

3. Typography

Body font family (text input with common font suggestions)
Display font family (text input)

4. Login Page

Title text
Subtitle text
Show Google sign-in (toggle)
Show forgot password (toggle)
Powered-by label + URL

5. Sidebar

Title text
Subtitle template (supports {role} placeholder — "Global Hospital · {role}")

6. AI Quick Actions

Editable list of label + prompt pairs
Add / remove / reorder

Save Flow

Supervisor edits fields → clicks Save → PUT /api/config/theme → sidecar validates + saves + backs up
Frontend re-fetches theme on save → CSS variables update → page reflects changes immediately (no reload needed)

File

src/pages/settings.tsx — new "Branding" tab (or src/pages/branding-settings.tsx if settings page is already complex)

What This Does NOT Change

Tailwind classes — no changes. Components continue using text-brand-secondary, bg-brand-solid, etc. The CSS variables they reference are overridden at runtime.
Component structure — no layout changes. Only content strings and colors change.
Untitled UI theme.css — not modified. The provider overrides are applied inline on <html>, higher specificity.

Scope

In scope:

Sidecar theme endpoint + JSON file
ThemeTokenProvider + useThemeTokens hook
Login page consuming tokens
Sidebar consuming tokens
AI quick actions consuming tokens
Brand color override via CSS variables
Typography override via CSS variables

Out of scope:

Dark mode customization (inherits from Untitled UI)
Per-role theming
Logo upload to cloud storage (uses URL for now — can be a data URI or hosted path)

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