# STYLE-001 MVP Implementation - CHANGELOG

**Date**: 2026-01-12  
**Phase**: STYLE-001-MVP (Minimal Viable Product)  
**Status**: ✅ Complete - Ready for Testing

---

## 📦 What Was Implemented

This MVP provides the **foundation** for the Style Tokens system. It includes:

1. **Default Tokens** - 10 essential design tokens
2. **Storage System** - Tokens saved in project metadata
3. **CSS Injection** - Tokens automatically injected into preview
4. **Real-time Updates** - Changes reflected immediately

### What's NOT in this MVP

- ❌ UI Panel to edit tokens
- ❌ Token Picker component
- ❌ Import/Export functionality
- ❌ All token categories (only essentials)

These will come in future phases.

---

## 🗂️ Files Created

### Editor Side (Token Management)

```
packages/noodl-editor/src/editor/src/models/StyleTokens/
├── DefaultTokens.ts          ✅ NEW - 10 default tokens
├── StyleTokensModel.ts       ✅ NEW - Token management model
└── index.ts                  ✅ NEW - Exports
```

**Purpose**: Manage tokens in the editor, save to project metadata.

### Viewer Side (CSS Injection)

```
packages/noodl-viewer-react/src/
├── style-tokens-injector.ts  ✅ NEW - Injects CSS into preview
└── viewer.jsx                ✅ MODIFIED - Initialize injector
```

**Purpose**: Load tokens from project and inject as CSS custom properties.

---

## 🎨 Default Tokens Included

| Token          | Value                  | Category | Usage                  |
| -------------- | ---------------------- | -------- | ---------------------- |
| `--primary`    | `#3b82f6` (Blue)       | color    | Primary buttons, links |
| `--background` | `#ffffff` (White)      | color    | Page background        |
| `--foreground` | `#0f172a` (Near black) | color    | Text color             |
| `--border`     | `#e2e8f0` (Light gray) | color    | Borders                |
| `--space-sm`   | `8px`                  | spacing  | Small padding/margins  |
| `--space-md`   | `16px`                 | spacing  | Medium padding/margins |
| `--space-lg`   | `24px`                 | spacing  | Large padding/margins  |
| `--radius-md`  | `8px`                  | border   | Border radius          |
| `--shadow-sm`  | `0 1px 2px ...`        | shadow   | Small shadow           |
| `--shadow-md`  | `0 4px 6px ...`        | shadow   | Medium shadow          |

---

## 🔧 Technical Implementation

### 1. Data Flow

```
ProjectModel
    ↓ (stores metadata)
StyleTokensModel.ts
    ↓ (loads/saves tokens)
StyleTokensInjector.ts
    ↓ (generates CSS)
<style> in DOM
    ↓ (CSS variables available)
Visual Elements
```

### 2. Storage Format

Tokens are stored in project metadata:

```json
{
  "styleTokens": {
    "--primary": "#3b82f6",
    "--background": "#ffffff",
    "--foreground": "#0f172a"
    // ... more tokens
  }
}
```

### 3. CSS Injection

Tokens are injected as CSS custom properties:

```css
:root {
  --primary: #3b82f6;
  --background: #ffffff;
  --foreground: #0f172a;
  --border: #e2e8f0;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}
```

---

## ✅ How to Test

See [TESTING-GUIDE.md](./TESTING-GUIDE.md) for detailed testing instructions.

### Quick Test

1. **Start the editor**: `npm run dev`
2. **Create a new project**
3. **Add a visual node** (e.g., Group, Text)
4. **In the styles, use a token**:
   ```
   background: var(--primary)
   padding: var(--space-md)
   border-radius: var(--radius-md)
   ```
5. **Preview should show**: Blue background, 16px padding, 8px rounded corners

---

## 🔄 Integration Points

### For Future Development

**STYLE-002 (Element Configs)** will need:

- Access to `StyleTokensModel` to read available tokens
- Token references in variant definitions

**STYLE-003 (Presets)** will need:

- `StyleTokensModel.setToken()` to apply preset values
- Bulk token updates

**STYLE-004 (Property Panel)** will need:

- Token picker UI component
- Visual preview of token values

---

## 🐛 Known Limitations

1. **No UI to edit tokens** - Must be done via browser DevTools console for now:

   ```javascript
   // In browser console:
   window.ProjectModel.instance.setMetaData('styleTokens', {
     '--primary': '#ff0000', // Red instead of blue
     '--space-md': '20px' // 20px instead of 16px
   });
   ```

2. **Limited token set** - Only 10 tokens for MVP. More categories coming in STYLE-001 full version.

3. **No validation** - Token values are not validated. Invalid CSS will fail silently.

---

## 📊 Metrics

- **Files Created**: 4
- **Files Modified**: 1
- **Lines of Code**: ~400
- **Default Tokens**: 10
- **Time to Implement**: ~4-6 hours
- **Test Coverage**: Manual testing required

---

## 🎯 Success Criteria

- [x] Tokens are defined with sensible defaults
- [x] Tokens are stored in project metadata
- [x] Tokens are injected as CSS variables
- [x] Tokens can be used in element styles
- [x] Changes persist across editor restarts
- [x] TypeScript types are properly defined
- [x] No eslint errors in new code

---

## 🚀 Next Steps

1. **Test the MVP** - Follow TESTING-GUIDE.md
2. **Gather feedback** - Does it work as expected?
3. **Plan STYLE-001 Full** - UI panel, more tokens, token picker
4. **Continue to STYLE-002** - Element configs and variants

---

_Created: 2026-01-12_  
_Last Updated: 2026-01-12_