# Collapsible Cards with Timer Implementation

**Date:** 2026-04-06

## Summary

Implemented collapsible "Thinking" and "Working" cards that start collapsed by default, with a timer showing how long the agent has been working.

## Changes Made

### 1. ThinkingCard Component (`ui/components/Chat/ThinkingCard.tsx`)
- Changed initial collapsed state from `false` to `true` (starts collapsed by default)
- Cards now remain collapsed when streaming finishes

### 2. ExploringCard Component (`ui/components/Chat/ExploringCard.tsx`)
- Changed initial collapsed state from `false` to `true` (starts collapsed by default)
- Added timer functionality:
  - Tracks elapsed time while agent is working
  - Starts timer when `isExploring` becomes true
  - Stops timer and shows final time when work completes
  - Formats time as "Xs" for seconds or "Xm Ys" for minutes
- Added timer display next to Papr logo animation in header

### 3. New WorkingCard Component (`ui/components/Chat/WorkingCard.tsx`)
- Created reusable WorkingCard component with same functionality as ExploringCard
- Supports collapsing (starts collapsed)
- Shows timer next to Papr logo when working
- Used by MessageItem for sequence-based rendering

### 4. WorkingCard Styles (`ui/components/Chat/WorkingCard.css`)
- Matches ExploringCard styles
- Added `.working-timer` class with:
  - 12px font size
  - Secondary text color
  - Tabular numbers for consistent width
  - 4px left margin

### 5. ExploringCard Styles (`ui/components/Chat/ExploringCard.css`)
- Added `.exploring-timer` class with same styling as working timer

### 6. MessageItem Component (`ui/components/Chat/MessageItem.tsx`)
- Replaced inline "Working" card div with WorkingCard component
- Imported WorkingCard component
- Removed duplicate PaprLogoIcon import
- Maintained proper import order (added back MiniChatCard import)

### 7. Bug Fixes (Pre-existing Issues)
- Fixed unused `existsSync` import in `src/gateway/utils/packageManager.ts`
- Fixed unused `existsSync` import in `src/electron/utils/pythonInstaller.ts`

## User Experience Changes

### Before
- Thinking and Working cards started expanded
- No indication of how long agent has been working
- Cards auto-collapsed after streaming finished

### After
- Thinking and Working cards start collapsed by default (cleaner UI)
- Timer shows elapsed time (e.g., "3s", "1m 15s") next to Papr logo while working
- Timer stops and shows final duration when work completes
- Users can still manually expand/collapse cards to see details

## Technical Details

### Timer Implementation
- Uses `useEffect` and `useRef` to track start time
- Updates every 1 second while active
- Cleans up interval on unmount or when work completes
- Formats time in human-readable format (seconds/minutes)

### Collapsed State
- Both cards now use `useState(true)` for initial collapsed state
- Manual toggle tracking preserved for user control
- Smooth CSS transitions for expand/collapse animations

## Files Modified
1. `ui/components/Chat/ThinkingCard.tsx`
2. `ui/components/Chat/ExploringCard.tsx`
3. `ui/components/Chat/ExploringCard.css`
4. `ui/components/Chat/MessageItem.tsx`
5. `src/gateway/utils/packageManager.ts` (bug fix)
6. `src/electron/utils/pythonInstaller.ts` (bug fix)

## Files Created
1. `ui/components/Chat/WorkingCard.tsx`
2. `ui/components/Chat/WorkingCard.css`

## Testing
- Build succeeds with no TypeScript errors
- No linter errors
- Timer functionality verified through code review
- Collapsed state verified through code review

## Future Enhancements
- Add timer pause/resume capability
- Show timer in different units (hours for very long operations)
- Color-code timer based on duration (green for fast, yellow for normal, red for slow)
- Add hover tooltips showing more detailed timing information
