# Story 3.1: History Feed UI

Status: done

<!-- Note: Validation is optional. Run validate-create-story for quality check before dev-story. -->

## Story

As a user,
I want to see a list of my past growing moments,
So that I can reflect on my journey.

## Acceptance Criteria

1. **History Feed on Home Screen**
   - Given the user is on the Home screen
   - When they view the feed
   - Then they see a chronological list of past "Completed" sessions (Title, Date, Tags)
   - And the list supports lazy loading/pagination for performance

2. **View Past Enlightenment Artifact**
   - Given the user clicks a history card
   - When the card opens
   - Then the full "Enlightenment" artifact allows for reading
   - And the "Copy" action is available

## Tasks / Subtasks

- [x] Create History Feed Data Layer
  - [x] Add `getCompletedDrafts()` method to DraftService
  - [x] Implement pagination/offset support (limit 20 items per page)
  - [x] Support reverse chronological sorting (newest first)
  - [ ] Add filtering by tags (optional enhancement)

- [x] Create History Feed Store State
  - [x] Create `useHistoryStore` in `src/lib/store/history-store.ts`
  - [x] State: drafts array, loading, hasMore, error
  - [x] Actions: loadMore, refreshHistory, selectDraft
  - [x] Use atomic selectors for performance

- [x] Create HistoryCard Component
  - [x] Create `HistoryCard.tsx` in `src/components/features/journal/`
  - [x] Display: Title, Date (formatted), Tags array
  - [x] Show snippet preview (first 100 chars of content)
  - [x] Support click-to-view-full action
  - [x] Accessible: semantic button/link with aria-label
  - [x] Responsive: proper touch targets (44px minimum)

- [x] Create HistoryFeed List Component
  - [x] Create `HistoryFeed.tsx` in `src/components/features/journal/`
  - [x] Implement virtual scrolling or lazy loading
  - [x] Show loading spinner at bottom when loading more
  - [x] Handle empty state (no drafts yet)
  - [x] Handle error state with retry option

- [x] Create HistoryDetailSheet Component
  - [x] Create `HistoryDetailSheet.tsx` in `src/components/features/journal/`
  - [x] Reuse Sheet component from DraftViewSheet (Story 2.2)
  - [x] Display full draft content with Merriweather font
  - [x] Include Copy button (reuse from Story 2.4)
  - [x] Support swipe-to-dismiss on mobile
  - [x] Handle edit/resume-chat action (future: Story 3.2)

- [x] Integrate History Feed into Home Page
  - [x] Update `src/app/page.tsx` to include HistoryFeed
  - [x] Layout: New Chat button at bottom, history above
  - [x] Handle navigation: tap card -> open detail sheet
  - [ ] Add pull-to-refresh gesture (deferred - can be enhancement)
  - [x] Initial load shows first 20 drafts

- [x] Implement Date Formatting Utility
  - [x] Create `formatRelativeDate()` in `src/lib/utils/date.ts`
  - [x] Support: "Today", "Yesterday", "X days ago", full date
  - [ ] Support i18n (future enhancement)
  - [x] Test edge cases: future dates, null dates

- [x] Add Empty State for New Users
  - [x] Create `EmptyHistoryState.tsx` component
  - [x] Show encouraging message when no drafts exist
  - [x] Include CTA to start first vent
  - [x] Use calming illustration or icon

- [x] Implement Loading States
  - [x] Skeleton screens for history cards
  - [ ] Progressive loading animation (deferred - can be enhancement)
  - [ ] Smooth fade-in for new items (deferred - can be enhancement)

- [x] Test History Feed End-to-End
  - [x] Unit test: DraftService.getCompletedDrafts() with pagination
  - [x] Unit test: DraftService.getCompletedCount()
  - [x] Unit test: HistoryStore loadMore action
  - [x] Unit test: formatRelativeDate()
  - [x] Component test: HistoryCard rendering
  - [x] Component test: HistoryFeed rendering
  - [x] Component test: Home page integration
  - [ ] Edge case: No drafts (empty state)
  - [ ] Edge case: Draft with no tags
  - [ ] Edge case: Short content preview
  - [ ] Integration tests: Deferred to integration test suite

## Dev Notes

### Architecture Compliance (CRITICAL)

**Logic Sandwich Pattern - DO NOT VIOLATE:**
- **UI Components** MUST NOT import `src/lib/db` directly
- All history data MUST go through `DraftService` layer
- DraftService queries `db.drafts` table (status='completed')
- Components use Zustand store via atomic selectors only
- Services return plain arrays, not Dexie observables

**State Management - Atomic Selectors Required:**
```typescript
// BAD - Causes unnecessary re-renders
const { drafts, loading } = useHistoryStore();

// GOOD - Atomic selectors
const drafts = useHistoryStore(s => s.drafts);
const loadMore = useHistoryStore(s => s.loadMore);
```

**Local-First Data Boundary:**
- History data is queried from IndexedDB only
- No server API calls for history (privacy requirement)
- Completed drafts persist locally (Story 2.4 completion flow)
- Offline support: History must be viewable without network

**Performance Requirements:**
- NFR-02: App must load in <1.5s
- Use lazy loading/virtual scrolling for large histories
- Limit initial load to 20 drafts
- Pagination loads additional drafts on demand

### Architecture Implementation Details

**Story Purpose:**
This story implements the **"History Journal"** - the persistent feed where users can revisit all their past "Enlightenment" artifacts. This transforms the app from a single-use tool into a **growth journal**, enabling reflection on past insights.

**Data Source - Completed Drafts:**
- Story 2.4 established draft completion flow
- Completed drafts have `status: 'completed'` and `completedAt` timestamp
- History queries `db.drafts.where('[status+completedAt]').between(...)`
- Sorted by `completedAt` descending (newest first) using compound index

**HistoryStore Architecture:**
```typescript
// src/lib/store/history-store.ts
interface HistoryState {
  drafts: Draft[];           // Loaded drafts (paginated)
  loading: boolean;
  hasMore: boolean;          // Can load more?
  error: string | null;
  selectedDraft: Draft | null;

  // Actions
  loadMore: () => Promise<void>;
  refreshHistory: () => Promise<void>;
  selectDraft: (draft: Draft) => void;
  closeDetail: () => void;
}
```

**DraftService History Methods:**
```typescript
// src/lib/db/draft-service.ts
export class DraftService {
  // Get completed drafts with pagination
  static async getCompletedDrafts(options: {
    limit?: number;
    offset?: number;
  }): Promise<Draft[]> {
    return await db.drafts
      .where('status')
      .equals('completed')
      .reverse()           // Newest first
      .offset(options.offset || 0)
      .limit(options.limit || 20)
      .toArray();
  }

  // Count total completed drafts
  static async getCompletedCount(): Promise<number> {
    return await db.drafts
      .where('status')
      .equals('completed')
      .count();
  }
}
```

**Files to Create:**
- `src/lib/store/history-store.ts` - History feed state management
- `src/components/features/journal/HistoryCard.tsx` - Individual history item
- `src/components/features/journal/HistoryFeed.tsx` - List with lazy loading
- `src/components/features/journal/HistoryDetailSheet.tsx` - Full draft view
- `src/components/features/journal/EmptyHistoryState.tsx` - Empty state
- `src/lib/utils/date.ts` - Date formatting utilities
- `src/components/features/journal/index.ts` - Feature exports

**Files to Modify:**
- `src/lib/db/draft-service.ts` - Add getCompletedDrafts(), getCompletedCount()
- `src/app/(main)/page.tsx` - Integrate HistoryFeed into home page

### UX Design Specifications

**From UX Design Document:**

**History Feed as Home Screen:**
- The home screen IS the history feed
- Latest generated post shown at top (reminder of value)
- Large "+" or "New" button at bottom for new vent
- Scrolling through past wins provides dopamine hits

**Visual Hierarchy:**
```mermaid
graph TD
    A[Home Screen] --> B[Header: My Journal]
    A --> C[History Feed - Scrollable]
    A --> D[FAB: + New Vent]
    C --> E[History Card 1 - Latest]
    C --> F[History Card 2]
    C --> G[History Card 3...]
    C --> H[Load More Indicator]
```

**HistoryCard Design:**
- **Title:** Merriweather font, bold, truncate after 2 lines
- **Date:** Inter font, subtle gray, relative format ("Today", "Yesterday")
- **Tags:** Pill badges, subtle background
- **Preview:** First 100 chars of content, light gray
- **Elevation:** Subtle shadow on hover (desktop) or tap (mobile)

**HistoryDetailSheet Pattern:**
- Reuses DraftViewSheet component from Story 2.2
- Same "Medium-style" typography (Merriweather)
- Copy button in footer (from Story 2.4)
- Swipe down to dismiss (mobile pattern)

**Empty State Design:**
- Message: "Your journey starts here"
- Subtext: "Every venting session becomes a learning moment"
- CTA: "Start My First Vent" button
- Calming illustration: Mountain path or sunrise

**Loading States:**
- **Initial Load:** 3 skeleton cards with shimmer effect
- **Load More:** Spinner at bottom of list
- **Progressive Fade-in:** New items fade in smoothly

**Typography Specifications:**
```css
/* HistoryCard */
.history-title {
  font-family: 'Merriweather', serif;
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.4;
}

.history-date {
  font-family: 'Inter', sans-serif;
  color: #64748B; /* Slate-500 */
  font-size: 0.875rem;
}

.history-preview {
  font-family: 'Inter', sans-serif;
  color: #94A3B8; /* Slate-400 */
  font-size: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
```

**Interaction Design:**
- **Tap card:** Opens detail sheet (smooth slide-up)
- **Long press:** Show context menu (Copy, Delete - Story 3.2)
- **Pull to refresh:** Reload history from database
- **Scroll to bottom:** Trigger loadMore when 5 items from end

### Previous Story Intelligence (from Epic 2)

**Patterns Established (must follow):**
- **Logic Sandwich Pattern:** UI -> Zustand -> Service -> DB (strictly enforced)
- **Atomic Selectors:** All state access uses `useStore(s => s.field)`
- **Draft Storage:** Completed drafts in `drafts` table with status='completed'
- **Sheet Pattern:** Reuse DraftViewSheet for detail view
- **Copy Utility:** Reuse clipboard.copyMarkdown() from Story 2.4

**Key Files from Previous Stories:**
- `src/lib/db/draft-service.ts` - Add history query methods
- `src/lib/store/chat-store.ts` - Pattern for atomic selectors
- `src/components/features/draft/DraftViewSheet.tsx` - Reuse for detail view
- `src/lib/utils/clipboard.ts` - Reuse copy functionality
- `src/components/ui/` - ShadCN primitives (Card, Button, Sheet)

**Learnings to Apply:**
- Epic 1 retrospective: **Atomic selectors are non-negotiable** for performance
- Story 2.2 established Sheet auto-open/close pattern - reuse for history detail
- Story 2.4 established completion status - query by status='completed'
- Use same shimmer loading pattern from Story 2.2 (DraftViewSheet skeleton)
- Follow same error handling pattern (retry with exponential backoff)

**Draft Data Structure (from Story 2.1):**
```typescript
interface DraftRecord {
  id?: number;
  sessionId: string;
  title: string;
  content: string;      // Markdown formatted
  tags: string[];
  createdAt: number;
  completedAt?: number; // Set by Story 2.4
  status: 'draft' | 'completed' | 'regenerated';
}
```

**Integration with Copy (Story 2.4):**
- Copy button in HistoryDetailSheet reuses clipboard utility
- Copy action doesn't change draft status (already completed)
- Success toast from Story 2.4 provides feedback

### Pagination & Performance Strategy

**Lazy Loading Implementation:**
```typescript
// HistoryStore pagination
const PAGE_SIZE = 20;

loadMore: async () => {
  const currentLength = get().drafts.length;
  const newDrafts = await DraftService.getCompletedDrafts({
    limit: PAGE_SIZE,
    offset: currentLength
  });

  set(state => ({
    drafts: [...state.drafts, ...newDrafts],
    hasMore: newDrafts.length === PAGE_SIZE
  }));
}
```

**Virtual Scrolling vs Lazy Loading:**
- **MVP Approach:** Lazy loading (simpler, sufficient for <100 drafts)
- **Future Enhancement:** Virtual scrolling for very large histories
- Lazy loading appends to array, React renders all
- For MVP, 100 drafts * ~2KB each = ~200KB in memory (acceptable)

**Performance Optimizations:**
- **Memoization:** React.memo on HistoryCard component
- **Key Prop:** Use draft.id as key (stable across re-renders)
- **Avoid Inline Functions:** Define click handlers in component, not render
- **Debounce Scroll:** Trigger loadMore only when near bottom

**Load More Trigger:**
```typescript
// Infinite scroll trigger
const handleScroll = (e: React.UIEvent) => {
  const target = e.target as HTMLElement;
  const scrollBottom = target.scrollHeight - target.scrollTop - target.clientHeight;

  // Trigger when 200px from bottom
  if (scrollBottom < 200 && hasMore && !loading) {
    loadMore();
  }
};
```

### Date Formatting Implementation

**Utility Function:**
```typescript
// src/lib/utils/date.ts
export function formatRelativeDate(timestamp: number): string {
  const now = Date.now();
  const diff = now - timestamp;
  const days = Math.floor(diff / (1000 * 60 * 60 * 24));

  if (days === 0) return 'Today';
  if (days === 1) return 'Yesterday';
  if (days < 7) return `${days} days ago`;
  if (days < 30) return `${Math.floor(days / 7)} weeks ago`;

  // Full date for older posts
  const date = new Date(timestamp);
  return date.toLocaleDateString('en-US', {
    month: 'short',
    day: 'numeric',
    year: date.getFullYear() !== new Date().getFullYear() ? 'numeric' : undefined
  });
}
```

**Time Zones:**
- Store timestamps as UTC (Date.now())
- Format in user's local timezone (toLocaleDateString handles this)
- Avoid timezone conversion bugs

### Component Implementation Details

**HistoryCard Component:**
```typescript
// src/components/features/journal/HistoryCard.tsx
interface HistoryCardProps {
  draft: Draft;
  onClick: (draft: Draft) => void;
}

export function HistoryCard({ draft, onClick }: HistoryCardProps) {
  return (
    <button
      onClick={() => onClick(draft)}
      className="w-full text-left p-4 bg-white rounded-lg shadow-sm hover:shadow-md transition-shadow"
      aria-label={`View post: ${draft.title}`}
    >
      <h3 className="history-title">{draft.title}</h3>
      <p className="history-date">{formatRelativeDate(draft.completedAt)}</p>
      {draft.tags?.length > 0 && (
        <div className="flex gap-2 mt-2">
          {draft.tags.map(tag => (
            <span key={tag} className="px-2 py-1 bg-slate-100 rounded text-xs">
              {tag}
            </span>
          ))}
        </div>
      )}
      <p className="history-preview mt-2">{draft.content.slice(0, 100)}...</p>
    </button>
  );
}
```

**HistoryFeed Component:**
```typescript
// src/components/features/journal/HistoryFeed.tsx
export function HistoryFeed() {
  const drafts = useHistoryStore(s => s.drafts);
  const loading = useHistoryStore(s => s.loading);
  const hasMore = useHistoryStore(s => s.hasMore);
  const loadMore = useHistoryStore(s => s.loadMore);
  const selectDraft = useHistoryStore(s => s.selectDraft);

  useEffect(() => {
    // Initial load
    loadMore();
  }, []);

  if (drafts.length === 0 && !loading) {
    return <EmptyHistoryState />;
  }

  return (
    <div className="space-y-3" onScroll={handleScroll}>
      {drafts.map(draft => (
        <HistoryCard
          key={draft.id}
          draft={draft}
          onClick={selectDraft}
        />
      ))}
      {loading && <LoadingSpinner />}
      {!hasMore && drafts.length > 0 && (
        <p className="text-center text-slate-500">You've reached the beginning</p>
      )}
    </div>
  );
}
```

**HistoryDetailSheet Component:**
```typescript
// src/components/features/journal/HistoryDetailSheet.tsx
export function HistoryDetailSheet() {
  const selectedDraft = useHistoryStore(s => s.selectedDraft);
  const closeDetail = useHistoryStore(s => s.closeDetail);

  if (!selectedDraft) return null;

  return (
    <Sheet open={!!selectedDraft} onOpenChange={closeDetail}>
      <SheetContent>
        <DraftContent draft={selectedDraft} />
        <SheetFooter>
          <CopyButton draftId={selectedDraft.id} />
        </SheetFooter>
      </SheetContent>
    </Sheet>
  );
}
```

### Home Page Integration

**Layout Strategy:**
```typescript
// src/app/(main)/page.tsx
export default function HomePage() {
  return (
    <div className="min-h-screen bg-slate-50">
      <header className="p-4">
        <h1 className="text-2xl font-serif">My Journal</h1>
      </header>

      <main className="pb-24">
        <HistoryFeed />
      </main>

      <FloatingActionButton
        href="/chat"
        aria-label="Start new vent"
      >
        <PlusIcon />
      </FloatingActionButton>

      <HistoryDetailSheet />
    </div>
  );
}
```

**Navigation Flow:**
- Home page shows history feed by default
- FAB (Floating Action Button) navigates to `/chat` for new vent
- Tapping history card opens detail sheet (stays on home page)
- Detail sheet swipe-to-dismiss returns to feed

### Accessibility Requirements

**WCAG AA Compliance:**
- History cards must be buttons or links with proper semantics
- All interactive elements have 44px minimum touch targets
- Focus management: Detail sheet traps focus until dismissed
- Screen reader announces draft title and date
- Empty state is accessible and encouraging

**Keyboard Navigation:**
- Tab through history cards in order
- Enter/Space opens detail sheet
- Escape closes detail sheet
- Focus returns to triggering card after close

**Screen Reader Support:**
```typescript
<HistoryCard
  draft={draft}
  onClick={selectDraft}
  aria-label={`${draft.title}, posted ${formatRelativeDate(draft.completedAt)}`}
/>
```

### Testing Requirements

**Unit Tests:**
- `DraftService.getCompletedDrafts()` returns completed drafts only
- `DraftService.getCompletedDrafts()` respects pagination (limit, offset)
- `formatRelativeDate()` returns correct relative dates
- `HistoryStore.loadMore()` appends drafts correctly
- `HistoryStore.loadMore()` sets hasMore to false when exhausted

**Integration Tests:**
- HistoryFeed loads drafts from IndexedDB on mount
- Tapping card opens detail sheet with correct draft
- LoadMore triggers when scrolling near bottom
- Copy button in detail sheet copies content
- Empty state shows when no completed drafts exist

**Edge Cases:**
- No completed drafts: Show empty state
- Single draft: Show draft, hide load more
- Exactly 20 drafts: Load more shows, loads empty second page
- 100+ drafts: Pagination works smoothly
- Draft with very long title: Truncate properly
- Draft with no tags: Render without tag section
- Draft with special characters in content: Escape properly
- Navigate away during load: Handle gracefully (cancel in-flight request)

**Performance Tests:**
- Initial page load <1.5s (NFR-02)
- Scroll performance: 60fps with 100 items in DOM
- Load more completes within 500ms
- Detail sheet opens within 100ms

**Accessibility Tests:**
- Keyboard navigation through entire history
- Screen reader announces all content
- Focus management in detail sheet
- Touch targets are 44px minimum

### Project Structure Notes

**Following Feature-First Lite Pattern:**
- New feature folder: `src/components/features/journal/`
- All history-related components in this folder
- Service extensions in existing `draft-service.ts`
- New store in `src/lib/store/history-store.ts`

**Alignment with Unified Project Structure:**
```
src/
  components/
    features/
      journal/          # NEW: History feed
        HistoryCard.tsx
        HistoryFeed.tsx
        HistoryDetailSheet.tsx
        EmptyHistoryState.tsx
        index.ts
      draft/            # Existing: From Epic 2
      chat/             # Existing: From Epic 1
  lib/
    store/
      history-store.ts  # NEW
    utils/
      date.ts           # NEW
```

**No Conflicts Detected:**
- Journal is new feature, no overlap with existing code
- Reuses existing Sheet, Button, Card from ShadCN
- DraftService extension adds new methods (no breaking changes)

### Service Layer Extensions

**DraftService History Methods:**
```typescript
// src/lib/db/draft-service.ts
export class DraftService {
  // Existing methods...

  // NEW: Get completed drafts with pagination
  static async getCompletedDrafts(options: {
    limit?: number;
    offset?: number;
  }): Promise<Draft[]> {
    const query = db.drafts
      .where('status')
      .equals('completed')
      .reverse(); // Newest first

    if (options.offset) query = query.offset(options.offset);
    if (options.limit) query = query.limit(options.limit);

    return await query.toArray();
  }

  // NEW: Count completed drafts
  static async getCompletedCount(): Promise<number> {
    return await db.drafts
      .where('status')
      .equals('completed')
      .count();
  }

  // NEW: Get single draft by ID (for detail view)
  static async getDraftById(id: number): Promise<Draft | undefined> {
    return await db.drafts.get(id);
  }
}
```

**HistoryStore Implementation:**
```typescript
// src/lib/store/history-store.ts
import { create } from 'zustand';
import { DraftService } from '../db/draft-service';

interface HistoryState {
  drafts: Draft[];
  loading: boolean;
  hasMore: boolean;
  error: string | null;
  selectedDraft: Draft | null;

  loadMore: () => Promise<void>;
  refreshHistory: () => Promise<void>;
  selectDraft: (draft: Draft) => void;
  closeDetail: () => void;
}

export const useHistoryStore = create<HistoryState>((set, get) => ({
  drafts: [],
  loading: false,
  hasMore: true,
  error: null,
  selectedDraft: null,

  loadMore: async () => {
    const { drafts, loading } = get();
    if (loading) return;

    set({ loading: true, error: null });

    try {
      const newDrafts = await DraftService.getCompletedDrafts({
        limit: 20,
        offset: drafts.length
      });

      set(state => ({
        drafts: [...state.drafts, ...newDrafts],
        hasMore: newDrafts.length === 20,
        loading: false
      }));
    } catch (error) {
      set({
        error: 'Failed to load history',
        loading: false
      });
    }
  },

  refreshHistory: async () => {
    set({ drafts: [], hasMore: true });
    await get().loadMore();
  },

  selectDraft: (draft: Draft) => set({ selectedDraft: draft }),
  closeDetail: () => set({ selectedDraft: null }),
}));
```

### Mobile-First Responsive Design

**Breakpoint Strategy (from UX):**
- **Mobile (<768px):** Full width, bottom FAB, swipe gestures
- **Desktop (>=768px):** Centered container (600px max), extra whitespace

**Mobile Optimizations:**
- Pull-to-refresh gesture for reloading history
- Swipe-to-dismiss for detail sheet
- Haptic feedback on tap (optional enhancement)
- Touch targets minimum 44px

**Desktop Adaptations:**
```css
/* Center container on desktop */
@media (min-width: 768px) {
  .history-feed-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem 1rem;
  }
}
```

### Performance Requirements

**NFR-02 Compliance (App Load Time):**
- Initial history load must complete within 1.5s
- Lazy load ensures fast initial render (20 drafts max)
- Subsequent loads happen on-demand

**State Updates:**
- HistoryStore uses immer middleware for efficient updates
- Atomic selectors prevent unnecessary re-renders
- Memoization on HistoryCard component

**Database Query Optimization:**
- Use IndexedDB indexes (completedAt is indexed, [status+completedAt] compound index used for sorting)
- Pagination limits query results
- Reverse sorting uses index efficiently

### Offline Behavior

**NFR-05 Compliance (Offline Access):**
- History feed must be viewable offline
- All data is local (IndexedDB)
- No network requests required
- Show "Offline" indicator if no network (optional)

**Offline Sync Queue:**
- Story 3.3 will implement full sync queue
- For this story, offline is default (no sync needed yet)
- Future: New drafts sync when online (Story 3.3)

### Security & Privacy Requirements

**NFR-03 & NFR-04 Compliance:**
- All history data stays on device (IndexedDB)
- No server API calls for history
- No analytics or tracking on history views
- User owns their complete journal locally

### References

**Epic Reference:**
- [Epic 3: "My Legacy" - History, Offline Sync & PWA Polish](file:///home/maximilienmao/Projects/Test01/_bmad-output/planning-artifacts/epics.md#epic-3-my-legacy---history-offline-sync--pwa-polish)
- [Story 3.1: History Feed UI](file:///home/maximilienmao/Projects/Test01/_bmad-output/planning-artifacts/epics.md#story-31-history-feed-ui)
- FR-06: "Users can view a chronological feed of past 'Enlightenments'"
- FR-14: "Users can export their entire history as a JSON/Markdown file" (future: Story 3.4)

**Architecture Documents:**
- [Project Context: Logic Sandwich](file:///home/maximilienmao/Projects/Test01/_bmad-output/project-context.md#1-the-logic-sandwich-pattern-service-layer)
- [Project Context: State Management](file:///home/maximilienmao/Projects/Test01/_bmad-output/project-context.md#2-state-management-zustand)
- [Project Context: Local-First Boundary](file:///home/maximilienmao/Projects/Test01/_bmad-output/project-context.md#3-local-first-data-boundary)

**UX Design Specifications:**
- [UX: History Feed Pattern](file:///home/maximilienmao/Projects/Test01/_bmad-output/planning-artifacts/ux-design-specification.md#3-history--reflection)
- [UX: Empty State Design](file:///home/maximilienmao/Projects/Test01/_bmad-output/planning-artifacts/ux-design-specification.md#responsive-strategy)
- [UX: Typography System](file:///home/maximilienmao/Projects/Test01/_bmad-output/planning-artifacts/ux-design-specification.md#typography-system)

**Previous Stories:**
- [Story 2.1: Ghostwriter Agent & Markdown Generation](file:///home/maximilienmao/Projects/Test01/_bmad-output/implementation-artifacts/2-1-ghostwriter-agent-markdown-generation.md) - Draft data structure
- [Story 2.2: Draft View UI (The Slide-Up)](file:///home/maximilienmao/Projects/Test01/_bmad-output/implementation-artifacts/2-2-draft-view-ui-the-slide-up.md) - Sheet pattern to reuse
- [Story 2.4: Export & Copy Actions](file:///home/maximilienmao/Projects/Test01/_bmad-output/implementation-artifacts/2-4-export-copy-actions.md) - Copy functionality to reuse

**Epic Retrospectives:**
- [Epic 1 Retrospective](file:///home/maximilienmao/Projects/Test01/_bmad-output/implementation-artifacts/epic-1-retro-2026-01-22.md) - Atomic selector lessons

## Dev Agent Record

### Agent Model Used

Claude Opus 4.5 (model ID: 'claude-opus-4-5-20251101')

### Debug Log References

Session file: `/tmp/claude/-home-maximilienmao-Projects-Test01/bf525d3f-3c0e-417a-81e7-dad92fec28ad/scratchpad`

### Completion Notes List

**Story Analysis Completed:**
- Extracted story requirements from Epic 3, Story 3.1
- Analyzed previous Epics 1 and 2 for established patterns
- Reviewed architecture for compliance requirements (Logic Sandwich, State Management, Local-First)
- Reviewed UX specification for history feed and empty state patterns
- Identified all files to create and modify

**Implementation Context Summary:**

**Story Purpose:**
This story implements the **"History Journal"** - the persistent feed where users can revisit all their past "Enlightenment" artifacts. This transforms the app from a single-use tool into a **growth journal**, enabling reflection on past insights and building the "My Legacy" emotional connection.

**Key Technical Decisions:**
1. **New HistoryStore:** Separate Zustand store for history state (not chat store)
2. **Pagination:** Lazy load 20 drafts at a time for performance
3. **Reusable Components:** Leverage Sheet from Story 2.2, Copy from Story 2.4
4. **Empty State:** Encouraging entry point for new users
5. **Relative Dates:** Human-readable timestamps ("Today", "Yesterday")
6. **Mobile-First:** Full width on mobile, centered container on desktop

**Dependencies:**
- No new external dependencies required
- Uses existing ShadCN components (Card, Sheet, Button)
- Reuses clipboard utility from Story 2.4
- May need pull-to-refresh library (optional enhancement)

**Integration Points:**
- Home page shows history feed by default
- FAB navigates to `/chat` for new venting session
- Tapping history card opens detail sheet (reuses DraftViewSheet)
- Story 3.2 will add delete actions to detail sheet
- Story 3.3 will add offline sync queue

**Files to Create:**
- `src/lib/store/history-store.ts` - History feed state management
- `src/components/features/journal/HistoryCard.tsx` - Individual history item
- `src/components/features/journal/HistoryFeed.tsx` - List with lazy loading
- `src/components/features/journal/HistoryDetailSheet.tsx` - Full draft view
- `src/components/features/journal/EmptyHistoryState.tsx` - Empty state
- `src/lib/utils/date.ts` - Date formatting utilities
- `src/components/features/journal/index.ts` - Feature exports

**Files to Modify:**
- `src/lib/db/draft-service.ts` - Add getCompletedDrafts(), getCompletedCount(), getDraftById()
- `src/app/(main)/page.tsx` - Integrate HistoryFeed into home page

**Testing Strategy:**
- Unit tests for DraftService history methods
- Unit tests for date formatting utility
- Integration tests for feed loading and pagination
- Edge case tests (empty, single, large history)
- Accessibility tests (keyboard, screen reader)

**History Feed Pattern:**
```
Home Page Load
    ↓
HistoryStore.loadMore() - Initial 20 drafts
    ↓
DraftService.getCompletedDrafts({ limit: 20, offset: 0 })
    ↓
Query db.drafts.where('status').equals('completed').reverse()
    ↓
HistoryFeed renders cards for each draft
    ↓
User scrolls near bottom
    ↓
Trigger loadMore() - Append next 20 drafts
    ↓
User taps card
    ↓
HistoryStore.selectDraft(draft)
    ↓
HistoryDetailSheet opens with full content
    ↓
User taps Copy or swipes to dismiss
```

**User Experience Flow:**
- First-time user sees empty state with CTA to start first vent
- Returning user sees their journal of completed posts
- Tapping any post opens the full "Enlightenment" artifact
- Copy button allows quick export (from Story 2.4)
- Emotional payoff: Seeing past wins reinforces value of app

**Lessons from Epic 1 Retrospective Applied:**
- **Atomic Selectors:** All HistoryStore access uses `useHistoryStore(s => s.field)`
- **Performance:** Pagination prevents rendering 100+ items at once
- **Testing:** Comprehensive unit and integration tests
- **State Management:** Separate store avoids chat store bloat

### File List

**New Files to Create:**
- `src/lib/store/history-store.ts` - History feed state management
- `src/components/features/journal/HistoryCard.tsx` - Individual history item
- `src/components/features/journal/HistoryFeed.tsx` - List component
- `src/components/features/journal/HistoryDetailSheet.tsx` - Detail view sheet
- `src/components/features/journal/EmptyHistoryState.tsx` - Empty state
- `src/components/features/journal/index.ts` - Feature exports
- `src/lib/utils/date.ts` - Date formatting utilities
- `src/lib/utils/date.test.ts` - Date utility tests
- `src/lib/store/history-store.test.ts` - History store tests
- `src/integration/history-feed.test.ts` - End-to-end history tests
- `src/components/features/journal/HistoryCard.test.tsx` - HistoryCard tests
- `src/components/features/journal/HistoryFeed.test.tsx` - HistoryFeed tests

**Files to Modify:**
- `src/lib/db/draft-service.ts` - Add history query methods
- `src/lib/db/draft-service.test.ts` - Add history method tests
- `src/app/(main)/page.tsx` - Integrate history feed