---
phase: 08-chat-window-ui
plan: 01
subsystem: ui
tags: [react, redux, windowportal, popup, chat]

# Dependency graph
requires:
  - phase: 07-chat-infrastructure
    provides: Redux sessionChatSlice with actions/selectors for window state management
  - phase: 03-backing-track-seek-controls
    provides: WindowPortal pattern for popup windows
provides:
  - JKChatHeader component for chat window header
  - JKSessionChatWindow component with WindowPortal integration
  - Integration point in JKSessionScreen for chat window
  - Integration tests for window open/close behavior
affects: [08-02-message-list-auto-scroll, 08-03-styling-polish]

# Tech tracking
tech-stack:
  added: []
  patterns: [WindowPortal for chat popup, Redux-driven window lifecycle, React.memo for performance]

key-files:
  created:
    - jam-ui/src/components/client/chat/JKChatHeader.js
    - jam-ui/src/components/client/JKSessionChatWindow.js
    - jam-ui/test/chat/chat-window.spec.ts
  modified:
    - jam-ui/src/components/client/JKSessionScreen.js
    - jam-ui/src/store/store.js

key-decisions:
  - "Used inline styles for MVP (SCSS deferred to Plan 8.3)"
  - "Followed WindowPortal pattern from Backing Track/JamTrack players"
  - "Exposed Redux store for testing (dev/test environments only)"
  - "Used React.memo for JKSessionChatWindow performance optimization"

patterns-established:
  - "Chat window follows same pattern as media players (BackingTrack/JamTrack/Metronome)"
  - "Window dimensions: 450×600px per design spec"
  - "Conditional rendering via Redux isWindowOpen selector"
  - "Close handler dispatches closeChatWindow action"

issues-created: []

# Metrics
duration: 35min
completed: 2026-01-27
---

# Phase 8 Plan 1: Chat Window Shell Summary

**Chat window with WindowPortal integration (450×600px popup), Redux-driven lifecycle, and placeholder content area**

## Performance

- **Duration:** 35 min
- **Started:** 2026-01-27T18:30:00Z
- **Completed:** 2026-01-27T19:05:00Z
- **Tasks:** 4
- **Files modified:** 5

## Accomplishments
- Created JKChatHeader component with channel name display and close button
- Created JKSessionChatWindow component with WindowPortal wrapper and Redux integration
- Integrated chat window into JKSessionScreen following media player pattern
- Wrote 3 integration tests for window open/close behavior and placeholder visibility

## Task Commits

Each task was committed atomically:

1. **Task 1: Create JKChatHeader component** - `33f9a357b` (feat)
2. **Task 2: Create JKSessionChatWindow with WindowPortal** - `c21aaef06` (feat)
3. **Task 3: Integrate with JKSessionScreen** - `738b15da1` (feat)
4. **Task 4: Integration tests** - `2c5d39d33` (test)

## Files Created/Modified
- `jam-ui/src/components/client/chat/JKChatHeader.js` - Header component with channel name and close button (NEW)
- `jam-ui/src/components/client/JKSessionChatWindow.js` - Main chat window with WindowPortal wrapper (NEW)
- `jam-ui/src/components/client/JKSessionScreen.js` - Added chat window render after JamTrack modal (MODIFIED)
- `jam-ui/test/chat/chat-window.spec.ts` - Integration tests for window lifecycle (NEW)
- `jam-ui/src/store/store.js` - Exposed Redux store for testing (MODIFIED)

## Decisions Made
- **Inline styles:** Used inline styles for MVP to match existing pattern from Phase 3-5 media players. SCSS styling deferred to Plan 8.3 as specified in plan.
- **Redux store exposure:** Exposed `window.__REDUX_STORE__` only in dev/test environments to enable Playwright tests to dispatch actions and verify state changes.
- **Window dimensions:** Used 450×600px as specified in Phase 6 design documents (CHAT_COMPONENT_DESIGN.md).
- **Performance optimization:** Used React.memo on JKSessionChatWindow since it's a pure component with no props (Redux-driven).

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None - WindowPortal pattern from Phase 3-5 worked seamlessly. Redux selectors from Phase 7 integrated without issues.

## Next Phase Readiness

Ready for Plan 8.2 (Message List & Auto-Scroll):
- Window shell complete with header and content area
- Placeholder div ready to be replaced with message list component
- WindowPortal lifecycle working correctly
- Redux integration verified via integration tests
- No blockers

---
*Phase: 08-chat-window-ui*
*Completed: 2026-01-27*
