# 🎨 Dialog Component Design
**Component: Dialog | Priority: HIGH | Status: ⚠️ Needs Major Work**

## 📋 Component Overview

The Dialog component is a **critical modal component** but currently has **significant issues** with test coverage and implementation completeness. This is a **Priority 1** component requiring immediate attention.

### **Current Status**
- ⚠️ **2 test files** with basic implementations
- ⚠️ **~20% test coverage** (estimated)
- ⚠️ **Missing accessibility tests**
- ⚠️ **Missing keyboard navigation tests**
- ⚠️ **Missing modal behavior tests**
- ✅ **Basic structure exists**
- ✅ **Context system implemented**

---

## 🎯 Design Specifications

### **Visual Design**
```css
/* Dialog Overlay */
.dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  animation: fade-in 0.2s ease-out;
}

/* Dialog Content */
.dialog-content {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 50;
  display: grid;
  width: 100%;
  max-width: 32rem;
  gap: 1rem;
  border: 1px solid hsl(var(--border));
  background-color: hsl(var(--background));
  padding: 1.5rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: translate(-50%, -50%);
  animation: slide-in 0.2s ease-out;
}

/* Dialog Header */
.dialog-header {
  display: flex;
  flex-direction: column;
  space-y: 1.5rem;
  text-align: center;
}

/* Dialog Footer */
.dialog-footer {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
}

/* Responsive Design */
@media (min-width: 640px) {
  .dialog-content {
    max-width: 28rem;
  }
  
  .dialog-footer {
    flex-direction: row;
    justify-content: flex-end;
  }
}
```

### **Animation Keyframes**
```css
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translate(-50%, -48%) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}
```

---

## 🔧 API Design

### **Dialog Root Component**
```rust
#[component]
pub fn Dialog(
    #[prop(into, optional)] open: Signal<bool>,
    #[prop(into, optional)] on_open_change: Option<Callback<bool>>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Trigger Component**
```rust
#[component]
pub fn DialogTrigger(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Content Component**
```rust
#[component]
pub fn DialogContent(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Header Component**
```rust
#[component]
pub fn DialogHeader(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Title Component**
```rust
#[component]
pub fn DialogTitle(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Description Component**
```rust
#[component]
pub fn DialogDescription(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Footer Component**
```rust
#[component]
pub fn DialogFooter(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

### **Dialog Close Component**
```rust
#[component]
pub fn DialogClose(
    #[prop(into, optional)] class: MaybeProp<String>,
    #[prop(optional)] children: Option<Children>,
) -> impl IntoView
```

---

## ♿ Accessibility Features

### **ARIA Attributes**
- `role="dialog"` on dialog content
- `aria-modal="true"` for modal behavior
- `aria-labelledby` linking to dialog title
- `aria-describedby` linking to dialog description
- `aria-hidden="true"` on background content

### **Keyboard Navigation**
- **Escape**: Close dialog
- **Tab**: Focus management within dialog
- **Shift+Tab**: Reverse focus management
- **Enter/Space**: Activate focused element

### **Focus Management**
- Focus trap within dialog
- Focus restoration after closing
- Initial focus on first focusable element
- Focus on trigger after closing

### **Screen Reader Support**
- Dialog title announced when opened
- Dialog description provided
- State changes announced
- Focus management communicated

---

## 🧪 Testing Requirements

### **Current Test Status**
- ⚠️ **2 test files** with basic implementations
- ⚠️ **Missing modal behavior tests**
- ⚠️ **Missing accessibility tests**
- ⚠️ **Missing keyboard navigation tests**
- ⚠️ **Missing integration tests**

### **Required Test Categories**

#### **1. Basic Rendering Tests**
```rust
#[test]
fn test_dialog_renders_without_errors() {
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(|| false),
        ..Default::default()
    });
    
    let rendered = dialog.render();
    assert!(rendered.contains("dialog"));
}

#[test]
fn test_dialog_content_renders() {
    let content = DialogContent::new(DialogContentProps {
        children: Some(Children::new()),
        ..Default::default()
    });
    
    let rendered = content.render();
    assert!(rendered.contains("dialog-content"));
}
```

#### **2. Modal Behavior Tests**
```rust
#[test]
fn test_dialog_opens_and_closes() {
    let (open, set_open) = signal(false);
    
    // Test opening
    set_open.set(true);
    assert!(open.get(), "Dialog should be open");
    
    // Test closing
    set_open.set(false);
    assert!(!open.get(), "Dialog should be closed");
}

#[test]
fn test_dialog_overlay_blocks_interaction() {
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(|| true),
        ..Default::default()
    });
    
    // Test that overlay prevents background interaction
    let rendered = dialog.render();
    assert!(rendered.contains("dialog-overlay"));
}
```

#### **3. Accessibility Tests**
```rust
#[test]
fn test_dialog_aria_attributes() {
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(|| true),
        ..Default::default()
    });
    
    let rendered = dialog.render();
    assert!(rendered.contains("role=\"dialog\""));
    assert!(rendered.contains("aria-modal=\"true\""));
}

#[test]
fn test_dialog_focus_management() {
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(|| true),
        ..Default::default()
    });
    
    // Test focus trap
    let rendered = dialog.render();
    assert!(rendered.contains("tabindex"));
}
```

#### **4. Keyboard Navigation Tests**
```rust
#[test]
fn test_dialog_escape_key() {
    let (open, set_open) = signal(true);
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(move || open.get()),
        on_open_change: Some(Callback::new(move |new_open| {
            set_open.set(new_open);
        })),
        ..Default::default()
    });
    
    // Simulate escape key
    // Test that dialog closes
    assert!(!open.get(), "Dialog should close on escape key");
}
```

#### **5. Integration Tests**
```rust
#[test]
fn test_dialog_with_form() {
    let (open, set_open) = signal(true);
    let form_submitted = signal(false);
    
    let dialog = Dialog::new(DialogProps {
        open: Signal::derive(move || open.get()),
        children: Some(Children::new()),
        ..Default::default()
    });
    
    // Test form submission within dialog
    form_submitted.set(true);
    assert!(form_submitted.get(), "Form should submit within dialog");
}
```

---

## 🚀 Performance Considerations

### **Bundle Size**
- **Base component**: ~3KB
- **With animations**: ~5KB
- **WASM optimized**: ~4KB

### **Render Performance**
- **Initial render**: <2ms
- **Open/close animation**: <200ms
- **Memory usage**: <2KB per instance

### **Optimization Strategies**
- Lazy rendering of dialog content
- CSS animations for smooth transitions
- Event delegation for keyboard handling
- Minimal re-renders on state changes

---

## 🔄 State Management

### **Context System**
```rust
#[derive(Clone, Copy)]
pub struct DialogContextValue {
    pub open: Signal<bool>,
    pub set_open: Callback<bool>,
}

// Provide context in Dialog root
provide_context(DialogContextValue {
    open: open_state,
    set_open,
});

// Consume context in child components
let ctx = expect_context::<DialogContextValue>();
```

### **Signal Integration**
```rust
// Dialog state management
let (open, set_open) = signal(false);

view! {
    <Dialog open=Signal::derive(move || open.get())>
        <DialogTrigger on:click=move |_| set_open.set(true)>
            "Open Dialog"
        </DialogTrigger>
        <DialogContent>
            <DialogHeader>
                <DialogTitle>"Dialog Title"</DialogTitle>
            </DialogHeader>
            <DialogFooter>
                <DialogClose on:click=move |_| set_open.set(false)>
                    "Close"
                </DialogClose>
            </DialogFooter>
        </DialogContent>
    </Dialog>
}
```

---

## 📱 Responsive Design

### **Breakpoint Behavior**
- **Mobile**: Full width, full height
- **Tablet**: Centered with margins
- **Desktop**: Fixed width, centered

### **Touch Targets**
- **Minimum size**: 44px × 44px for interactive elements
- **Touch-friendly spacing**
- **Swipe gestures for mobile**

---

## 🎨 Theming Support

### **CSS Custom Properties**
```css
:root {
  --dialog-overlay: rgba(0, 0, 0, 0.5);
  --dialog-background: hsl(var(--background));
  --dialog-border: hsl(var(--border));
  --dialog-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}
```

### **Dark Mode Support**
- Automatic theme switching
- High contrast mode support
- Custom theme overrides

---

## 🔧 Implementation Notes

### **Current Implementation**
- **File**: `packages/leptos/dialog/src/default.rs` (219 lines)
- **Status**: ⚠️ Basic implementation, needs enhancement
- **Tests**: `packages/leptos/dialog/src/tests.rs` (353 lines)

### **Required Implementation**
1. **Add comprehensive accessibility features**
2. **Implement keyboard navigation**
3. **Add focus management**
4. **Create modal behavior tests**
5. **Add integration tests**

---

## 📋 Action Items

### **Immediate (Week 1) - Priority 1**
- [ ] **Add accessibility features** (ARIA attributes, focus management)
- [ ] **Implement keyboard navigation** (Escape, Tab, Enter)
- [ ] **Create modal behavior tests**
- [ ] **Add focus trap functionality**

### **Short-term (Week 2-3)**
- [ ] **Implement comprehensive test suite**
- [ ] **Add integration tests**
- [ ] **Create performance benchmarks**
- [ ] **Add animation support**

### **Long-term (Week 4+)**
- [ ] **Advanced modal features**
- [ ] **Custom animations**
- [ ] **Performance optimizations**
- [ ] **Advanced theming**

---

## 🎯 Success Metrics

### **Quality Metrics**
- **Test coverage**: 90%+ (current: ~20%)
- **Accessibility score**: AAA compliance
- **Performance**: <2ms render time
- **Bundle size**: <4KB optimized

### **Functionality Metrics**
- **Modal behavior**: 100% working
- **Accessibility compliance**: WCAG 2.1 AA
- **Keyboard navigation**: 100% functional
- **Focus management**: 100% working

---

## 🚨 Critical Issues

### **Must Fix Immediately**
1. **Missing accessibility features** - ARIA attributes, focus management
2. **No keyboard navigation** - Escape key, Tab management
3. **Missing modal behavior tests** - Core functionality not tested
4. **No focus trap** - Essential for modal behavior

### **Impact Assessment**
- **High impact** on user experience
- **Critical for accessibility** compliance
- **Essential for modal functionality**
- **Required for production readiness**

---

This Dialog component is **critical** and requires **immediate attention** to bring it to production-ready status. It serves as the foundation for all modal interactions in the library.

---

*Design document created: September 20, 2025*  
*Last updated: September 20, 2025*
