# Statistics Window - Apple Design System Updates

## ✅ Changes Made to Follow Apple HIG

### 1. **Picker Style** 
**Before:** `.pickerStyle(.segmented)` with fixed width
**After:** `.pickerStyle(.menu)` - Standard macOS dropdown
- More compact
- Follows macOS conventions
- Better for 4+ options

### 2. **KPI Cards**
**Before:** Custom `VStack` with manual background color and corner radius
```swift
.background(Color.secondary.opacity(0.06))
.cornerRadius(12)
```

**After:** Native `GroupBox` component
```swift
GroupBox {
    // Content
}
```
- Uses system-defined appearance
- Adapts to light/dark mode automatically
- Follows Apple's design language

### 3. **Layout**
**Before:** `HStack` with fixed spacing
**After:** `Grid` with `GridRow`
```swift
Grid(horizontalSpacing: 12, verticalSpacing: 12) {
    GridRow {
        // First row
    }
    GridRow {
        // Second row
    }
}
```
- Better alignment
- Responsive sizing
- Apple's recommended layout tool

### 4. **Empty State**
**Before:** Custom `VStack` with manual styling
```swift
VStack(spacing: 12) {
    Image(systemName: "chart.line.uptrend.xyaxis")
        .font(.system(size: 48))
        .foregroundColor(.secondary)
    Text("No data yet")
    // ...
}
```

**After:** `ContentUnavailableView` (iOS 17+/macOS 14+)
```swift
ContentUnavailableView {
    Label("No Data Yet", systemImage: "chart.xyaxis.line")
} description: {
    Text("Statistics will appear here once you start converting text")
}
```
- Native Apple component
- Consistent appearance across system
- Automatically styled

### 5. **Color API**
**Before:** `.foregroundColor(.secondary)`
**After:** `.foregroundStyle(.secondary)`
- New SwiftUI API
- More powerful and flexible
- Supports hierarchical styles

### 6. **Typography**
**Before:** Mixed sizing
**After:** Consistent hierarchy
- Title: `.title2` with `.fontWeight(.semibold)`
- Section: `.title3` with `.fontWeight(.semibold)`
- Values: `.system(size: 36, weight: .semibold, design: .rounded)`
- Labels: `.caption` with `.textCase(.uppercase)`

### 7. **Icons**
**Before:** `arrow.up` / `arrow.down`
**After:** `arrow.up.right` / `arrow.down.right`
- Better visual indication of trend
- More commonly used in analytics

### 8. **Footer Buttons**
**Before:** Plain "Close" button
**After:** 
- "Done" button with `.borderedProminent` style
- Destructive "Reset" in red on left
- Follows macOS toolbar pattern

### 9. **Background**
**Before:** No explicit background
**After:** `.background(.background)`
- Uses system background color
- Better separation in toolbar areas
- Adapts to appearance mode

### 10. **Chart Legend**
**Before:** Not explicitly positioned
**After:** `.chartLegend(position: .bottom, alignment: .leading)`
- Consistent placement
- Aligned with chart
- Apple Charts best practice

### 11. **Window Size**
**Before:** 750 x 600
**After:** 800 x 600
- More breathing room
- Better for Grid layout
- Standard macOS window size

---

## 🎨 Apple Design System Components Used

### Native SwiftUI Components
- ✅ `GroupBox` - For KPI cards
- ✅ `Grid` / `GridRow` - For layout
- ✅ `ContentUnavailableView` - For empty state
- ✅ `Label` - For icon + text combinations
- ✅ `Picker` with `.menu` style
- ✅ `Button` with `.borderedProminent`
- ✅ `Divider`
- ✅ `ScrollView`

### Swift Charts Components
- ✅ `Chart`
- ✅ `LineMark`
- ✅ `AreaMark`
- ✅ `AxisMarks`
- ✅ `.chartLegend()`
- ✅ `.chartForegroundStyleScale()`

### System Colors
- ✅ `.primary`
- ✅ `.secondary`
- ✅ `.background`
- ✅ `.green` / `.red` (for trends)
- ✅ `.blue` / `.orange` (for chart lines)

### Typography Styles
- ✅ `.title2`
- ✅ `.title3`
- ✅ `.caption`
- ✅ `.system(design: .rounded)` for numbers

---

## 📊 Visual Comparison

### Before (Custom Design)
```
┌────────────────────────────────────┐
│ 📊 Statistics   [Day|Week|Month|Year]│  ← Segmented
├────────────────────────────────────┤
│ ┌────┐ ┌────┐ ┌────┐ ┌────┐       │
│ │10  │ │183 │ │7   │ │3   │       │  ← Custom cards
│ │↑88%│ │... │ │... │ │... │       │
│ └────┘ └────┘ └────┘ └────┘       │
└────────────────────────────────────┘
```

### After (Apple Design System)
```
┌────────────────────────────────────┐
│ 📊 Statistics      Show [Week ▼]   │  ← Menu picker
├────────────────────────────────────┤
│ ┏━━━━┓ ┏━━━━┓                      │
│ ┃ 10 ┃ ┃183 ┃                      │  ← GroupBox
│ ┃↗88%┃ ┃... ┃                      │
│ ┗━━━━┛ ┗━━━━┛                      │
│ ┏━━━━┓ ┏━━━━┓                      │
│ ┃ 7  ┃ ┃ 3  ┃                      │
│ ┃... ┃ ┃... ┃                      │
│ ┗━━━━┛ ┗━━━━┛                      │
├────────────────────────────────────┤
│ [Reset Statistics…]        [Done]  │  ← Bordered prominent
└────────────────────────────────────┘
```

---

## ✅ Benefits

### For Users
- **Familiar:** Looks like other macOS apps
- **Consistent:** Follows system appearance
- **Accessible:** Native components have built-in accessibility
- **Adaptive:** Automatically adjusts to light/dark mode

### For Developers
- **Maintainable:** Less custom code
- **Future-proof:** Updates with OS
- **Less code:** Native components handle styling
- **Best practices:** Following Apple's recommendations

---

## 🎯 Apple HIG Compliance

### Layout ✅
- Uses Grid for multi-column layouts
- Proper spacing (12-20px)
- Responsive sizing

### Typography ✅
- System font stack
- Hierarchical text styles
- Rounded design for numbers (common in analytics)

### Color ✅
- Semantic colors (.primary, .secondary)
- System accent colors
- Proper contrast ratios

### Components ✅
- Native SwiftUI components
- Standard button styles
- System-provided empty states

### Interaction ✅
- Standard picker behavior
- Keyboard shortcuts
- Expected button placement

---

## 📝 Code Improvements

### Lines Reduced
- Removed custom background styling: ~5 lines
- Removed custom empty state: ~10 lines
- Used GroupBox instead of manual styling: ~3 lines
- **Net reduction:** ~18 lines while improving quality

### Readability
- More declarative
- Clearer intent
- Self-documenting

### Maintainability
- Adapts to future macOS versions
- No manual color calculations
- No custom corner radius magic numbers

---

## 🚀 Result

The statistics window now:
- ✅ Looks native to macOS
- ✅ Uses Apple's design components
- ✅ Follows Human Interface Guidelines
- ✅ Adapts to system appearance
- ✅ Feels professional and polished
- ✅ Matches other Apple productivity apps

**Build with ⌘B and see the difference!** ✨

---

**Updated:** February 3, 2026  
**Compliance:** Apple Human Interface Guidelines  
**Components:** 100% Native SwiftUI  
**Custom Styling:** Minimized

