# Phase 1: Type-Specific Detail Views - COMPLETE

## Summary

Phase 1 implementation is complete. All type-specific detail views (Requirement, Test, Epic) have been created, the router has been implemented, and route integration is done.

---

## Files Created

### 1. EpicDetailView Component
**Location**: `/frontend/apps/web/src/views/details/EpicDetailView.tsx`

**Purpose**: Display detailed information for epic items with business value tracking, timeline visualization, and story breakdown.

**Key Features**:
- Business value, stories, and completion metrics
- Timeline progress visualization
- Epic specification with objectives and scope
- Story links and themes
- Success criteria and risk management
- Deep purple theme (#7c3aed)

**Tabs**:
1. Overview - Key metrics and status
2. Epic Specification - Objectives, scope, constraints
3. Timeline - Start/end dates, progress tracking
4. Stories - User story links and themes
5. Acceptance Criteria - Success criteria and risks

**Dependencies**:
- `@tracertm/types` - Type guards and interfaces
- `@tracertm/ui` - UI components
- `@/hooks/useItemSpecs` - Epic spec data fetching
- `./BaseDetailView` - Base layout component

---

### 2. ItemDetailRouter Component
**Location**: `/frontend/apps/web/src/views/details/ItemDetailRouter.tsx`

**Purpose**: Route items to the correct type-specific detail view based on item type.

**Routing Logic**:
```typescript
if (isRequirementItem(item)) → RequirementDetailView
if (isTestItem(item)) → TestDetailView
if (isEpicItem(item)) → EpicDetailView
if (isUserStoryItem(item)) → "Coming Soon" placeholder
if (isTaskItem(item)) → "Coming Soon" placeholder
if (isDefectItem(item)) → "Coming Soon" placeholder
else → ItemDetailView (generic fallback)
```

**Type Guards Used**:
- `isRequirementItem(item)`
- `isTestItem(item)`
- `isEpicItem(item)`
- `isUserStoryItem(item)` (placeholder)
- `isTaskItem(item)` (placeholder)
- `isDefectItem(item)` (placeholder)

---

### 3. Updated Exports File
**Location**: `/frontend/apps/web/src/views/details/index.ts`

**Changes**:
- Added `ItemDetailRouter` as default export
- Added `ItemDetailRouter` as named export
- Added `EpicDetailView` export
- Maintained existing exports for base components and tabs

**Exports**:
```typescript
// Router
export { default } from "./ItemDetailRouter";
export { default as ItemDetailRouter } from "./ItemDetailRouter";

// Type-specific views
export { RequirementDetailView } from "./RequirementDetailView";
export { TestDetailView } from "./TestDetailView";
export { EpicDetailView } from "./EpicDetailView";

// Base components
export { BaseDetailView } from "./BaseDetailView";
export { DetailHeader } from "./DetailHeader";

// Shared tabs
export { OverviewTab } from "./tabs/OverviewTab";
export { LinksTab } from "./tabs/LinksTab";
export { HistoryTab } from "./tabs/HistoryTab";
export { CommentsTab } from "./tabs/CommentsTab";
```

---

### 4. Updated Route File
**Location**: `/frontend/apps/web/src/routes/projects.$projectId.views.$viewType.$itemId.tsx`

**Changes**:
- Replaced `ItemDetailView` with `ItemDetailRouter`
- Added item fetching with `useItem` hook
- Added loading and error states
- Pass item and projectId to router

**Before**:
```tsx
function ItemDetailComponent() {
  return <ItemDetailView />;
}
```

**After**:
```tsx
function ItemDetailComponent() {
  const { projectId, itemId } = useParams({ strict: false });
  const { data: item, isLoading, error } = useItem(projectId, itemId);

  if (isLoading) return <LoadingSpinner />;
  if (error || !item) return <ErrorMessage />;

  return <ItemDetailRouter item={item} projectId={projectId} />;
}
```

---

### 5. Documentation
**Location**: `/frontend/apps/web/docs/TYPE_SPECIFIC_DETAIL_VIEWS.md`

**Contents**:
- Architecture overview
- Detailed view component documentation
- Router component explanation
- BaseDetailView usage guide
- Creating new detail views guide
- Migration guide from old ItemDetailView
- Type guards reference
- Design patterns and best practices
- Accessibility notes
- Performance optimization
- Testing examples
- Quick reference table

**Sections**:
1. Overview
2. Architecture
3. Available Detail Views
4. Router Component
5. BaseDetailView Component
6. Creating a New Detail View
7. Item Specs System
8. Migration Guide
9. Type Guards Reference
10. Design Patterns
11. Accessibility
12. Performance
13. Testing
14. Coming Soon
15. Related Documentation
16. Quick Reference

---

## Type-Specific Views Implemented

### ✅ RequirementDetailView
- **Item Types**: `requirement`
- **Color Theme**: Purple (#8b5cf6)
- **Key Features**: EARS patterns, quality metrics, ISO 29148 compliance
- **Tabs**: Overview, EARS Pattern, Quality, Risk & Verification, Traceability, History

### ✅ TestDetailView
- **Item Types**: `test`, `test_case`, `test_suite`
- **Color Theme**: Green (#10b981)
- **Key Features**: Execution metrics, flakiness tracking, coverage analysis
- **Tabs**: Overview, Test Spec, Execution, Metrics, Links, History

### ✅ EpicDetailView
- **Item Types**: `epic`
- **Color Theme**: Deep Purple (#7c3aed)
- **Key Features**: Business value, timeline tracking, story breakdown
- **Tabs**: Overview, Epic Specification, Timeline, Stories, Acceptance Criteria

---

## Coming Soon (Phase 2)

### 🔲 UserStoryDetailView
- **Item Types**: `user_story`, `story`
- **Planned Features**: Story format, acceptance criteria, story points

### 🔲 TaskDetailView
- **Item Types**: `task`
- **Planned Features**: Checklist tracking, time estimation, code changes

### 🔲 DefectDetailView
- **Item Types**: `bug`, `defect`
- **Planned Features**: Reproduction steps, severity tracking, resolution workflow

---

## Architecture Decisions

### 1. Type Guards for Routing
Using TypeScript type guards (`isEpicItem`, `isTestItem`, etc.) ensures:
- Type safety at compile time
- Runtime type checking
- Proper TypeScript narrowing
- Clear routing logic

### 2. BaseDetailView Pattern
All views use `BaseDetailView` for:
- Consistent layout and navigation
- Shared responsive behavior
- Uniform accessibility features
- Reduced code duplication

### 3. Spec Data Pattern
Each view fetches enhanced data via `useItemSpecs`:
- Separation of concerns (base item vs. spec data)
- Optimized caching with TanStack Query
- Type-safe spec interfaces
- Flexible data fetching

### 4. Tab-Based Organization
Content organized into logical tabs:
- Progressive disclosure of information
- Reduced initial render complexity
- Clear information hierarchy
- Better mobile experience

---

## Testing Verification

### Import Verification ✓
All imports verified:
- ✓ Type guard imports
- ✓ BaseDetailView imports
- ✓ Hook imports
- ✓ Component imports
- ✓ Router imports
- ✓ Export definitions

### File Structure ✓
```
/frontend/apps/web/src/views/details/
├── BaseDetailView.tsx          [Existing]
├── DetailHeader.tsx            [Existing]
├── RequirementDetailView.tsx   [Existing]
├── TestDetailView.tsx          [Existing]
├── EpicDetailView.tsx          [NEW]
├── ItemDetailRouter.tsx        [NEW]
├── index.ts                    [UPDATED]
├── README.md                   [Existing]
└── tabs/                       [Existing]
    ├── OverviewTab.tsx
    ├── LinksTab.tsx
    ├── HistoryTab.tsx
    └── CommentsTab.tsx

/frontend/apps/web/docs/
└── TYPE_SPECIFIC_DETAIL_VIEWS.md [NEW]
```

---

## Integration Points

### 1. Route Integration
**File**: `projects.$projectId.views.$viewType.$itemId.tsx`
- Uses `ItemDetailRouter` for all item detail pages
- Fetches item data with `useItem` hook
- Handles loading and error states
- Backward compatible with existing routes

### 2. Type System Integration
**Package**: `@tracertm/types`
- Imports type guards: `isEpicItem`, `isTestItem`, `isRequirementItem`
- Uses typed item interfaces: `EpicItem`, `TestItem`, `RequirementItem`
- Ensures type safety throughout component tree

### 3. Data Fetching Integration
**Hook**: `@/hooks/useItemSpecs`
- `useEpicSpecByItem(projectId, itemId)`
- `useTestSpecByItem(projectId, itemId)`
- `useRequirementSpecByItem(projectId, itemId)`
- Integrated with TanStack Query for caching

### 4. UI Component Integration
**Package**: `@tracertm/ui`
- Badge, Card, Progress, Separator
- Tabs, TabsList, TabsTrigger, TabsContent
- Consistent with existing design system

---

## Usage Examples

### Basic Usage
```tsx
import { ItemDetailRouter } from '@/views/details';

<ItemDetailRouter item={item} projectId={projectId} />
```

### Specific View Usage
```tsx
import { EpicDetailView } from '@/views/details';

<EpicDetailView item={epicItem} projectId={projectId} />
```

### Route Usage
```tsx
// Route: /projects/123/views/table/epic-456
// Automatically renders EpicDetailView

function ItemDetailComponent() {
  const { projectId, itemId } = useParams({ strict: false });
  const { data: item } = useItem(projectId, itemId);

  return <ItemDetailRouter item={item} projectId={projectId} />;
}
```

---

## Accessibility Features

All views include:
- ✓ ARIA labels on all interactive elements
- ✓ Keyboard navigation support (Tab, Arrow keys)
- ✓ Screen reader announcements
- ✓ Focus management
- ✓ High contrast mode support
- ✓ Semantic HTML structure
- ✓ Proper heading hierarchy

Example:
```tsx
<TabsTrigger
  value="overview"
  aria-label="Epic overview with key metrics"
>
  Overview
</TabsTrigger>
```

---

## Performance Optimizations

1. **Lazy Tab Loading**: Tab content renders only when active
2. **Memoized Tabs**: `useMemo` prevents unnecessary re-renders
3. **Query Caching**: TanStack Query caches API responses
4. **Conditional Rendering**: Hide sections with no data
5. **Progressive Loading**: Spec data loads after initial render

Example:
```tsx
const tabs = useMemo(() => {
  return [/* tab definitions */];
}, [item, epicSpec, specLoading]);
```

---

## Type Safety

All components are fully typed:

```typescript
interface EpicDetailViewProps {
  item: EpicItem;        // Type-safe via type guard
  projectId: string;
}

interface ItemDetailRouterProps {
  item: TypedItem;       // Union of all item types
  projectId: string;
}
```

---

## Next Steps (Phase 2)

1. **Implement UserStoryDetailView**
   - Story format with "As a / I want / So that"
   - Acceptance criteria checklist
   - Story points and estimation
   - Parent epic linking

2. **Implement TaskDetailView**
   - Subtask breakdown
   - Time tracking (estimated vs actual)
   - Code changes tracking
   - Checklist items

3. **Implement DefectDetailView**
   - Reproduction steps
   - Severity and priority tracking
   - Root cause analysis
   - Resolution workflow

4. **Enhanced Router Logic**
   - Preloading for smooth transitions
   - Route-based breadcrumbs
   - Deep linking to specific tabs

5. **Testing**
   - Unit tests for each view
   - Integration tests for router
   - E2E tests for navigation
   - Accessibility audits

---

## References

- [Type-Specific Detail Views Documentation](./frontend/apps/web/docs/TYPE_SPECIFIC_DETAIL_VIEWS.md)
- [BaseDetailView Component](./frontend/apps/web/src/views/details/BaseDetailView.tsx)
- [Item Specs Hooks](./frontend/apps/web/src/hooks/useItemSpecs.ts)
- [Type Guards](./frontend/packages/types/src/index.ts)

---

## Status: ✅ COMPLETE

Phase 1 is fully implemented and ready for testing:
- ✅ EpicDetailView created
- ✅ ItemDetailRouter created
- ✅ Route integration updated
- ✅ Exports configured
- ✅ Documentation complete
- ✅ Import verification passed
- ✅ Type safety confirmed
- ✅ Accessibility features included

**Next**: Begin Phase 2 (UserStory, Task, Defect views) or test current implementation.
