---
phase: 14-chat-integration-and-display
plan: 01
subsystem: ui
tags: [react, websocket, chat, attachments, protobuf]

# Dependency graph
requires:
  - phase: 13-file-upload-infrastructure
    provides: "File upload flow with Redux state, validation, and upload service"
provides:
  - "Attachment message display in chat with metadata (filename, size, uploader, timestamp)"
  - "Visual distinction for attachment messages (light blue background, paperclip icon)"
  - "WebSocket message transformation including attachment fields"
affects: [14-02-attachment-download]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Conditional message rendering based on attachmentId presence"
    - "WebSocket payload transformation to Redux format with optional attachment fields"

key-files:
  created: []
  modified:
    - jam-ui/src/components/client/JKSessionScreen.js
    - jam-ui/src/components/client/chat/JKChatMessage.js

key-decisions:
  - "Use light blue background (#e3f2fd) to distinguish attachment messages from regular text messages (#f8f9fa)"
  - "Display file size only if available from backend (graceful fallback for missing data)"
  - "Use paperclip emoji (📎) with accessibility attributes for visual indicator"

patterns-established:
  - "Attachment detection pattern: Check attachmentId && attachmentName presence"
  - "Message format: '[UserName] attached [FileName] (size)'"

# Metrics
duration: 2min
completed: 2026-02-05
---

# Phase 14 Plan 01: Chat Attachment Display Summary

**Chat messages now distinguish attachments with light blue styling, paperclip icon, filename, size, and timestamp**

## Performance

- **Duration:** 2 min
- **Started:** 2026-02-05T14:11:57Z
- **Completed:** 2026-02-05T14:13:53Z
- **Tasks:** 2
- **Files modified:** 2

## Accomplishments
- WebSocket CHAT_MESSAGE handler transforms attachment fields (attachmentId, attachmentName, attachmentType, purpose, attachmentSize) into Redux format
- JKChatMessage component renders attachment messages with distinct visual styling (light blue background, paperclip icon)
- File metadata displays in "[UserName] attached [FileName] (size)" format with graceful handling of missing data
- Regular text messages render unchanged, maintaining chronological order with attachment messages

## Task Commits

Each task was committed atomically:

1. **Task 1: Extend WebSocket message transformation to include attachment fields** - `6d1cf48` (feat)
2. **Task 2: Extend JKChatMessage to render attachment messages with metadata** - `b8bfd23` (feat)

## Files Created/Modified
- `jam-ui/src/components/client/JKSessionScreen.js` - Extended CHAT_MESSAGE WebSocket handler to transform attachment fields (attachmentId, attachmentName, attachmentType, purpose, attachmentSize) from Protocol Buffer payload to Redux format
- `jam-ui/src/components/client/chat/JKChatMessage.js` - Added conditional rendering for attachment messages with paperclip icon, light blue background, and metadata display (filename and size); imported formatFileSize utility; updated PropTypes for optional attachment fields

## Decisions Made

1. **Visual distinction via background color**: Attachment messages use light blue (#e3f2fd with border #bbdefb) vs regular messages gray (#f8f9fa) for immediate visual differentiation
2. **Graceful size handling**: Display file size only if attachmentSize is present in payload; backend may not always include size, so UI handles absence gracefully
3. **Emoji with accessibility**: Use paperclip emoji (📎) with `role="img"` and `aria-label="attachment"` for screen reader compatibility
4. **Message text optional**: Updated PropTypes to make `message` field optional since attachment-only messages may not have text content

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None. Implementation was straightforward with existing Phase 13 infrastructure.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

Ready for Phase 14 Plan 02 (attachment download functionality):
- Attachment messages display with all required metadata
- attachmentId available for download API calls
- Visual feedback in place for user to identify downloadable files
- No blockers

---
*Phase: 14-chat-integration-and-display*
*Completed: 2026-02-05*
