# Phase 1 Modal Migration - Completed

## Summary

Successfully migrated all modal state from `useState` hooks to Redux in **JKSessionScreen.js**.

## Changes Made

### 1. Updated Redux Slice (`sessionUISlice.js`)
Added `mediaControls` modal to the initialState:
```javascript
modals: {
  settings: false,
  invite: false,
  volume: false,
  recording: false,
  leave: false,
  jamTrack: false,
  backingTrack: false,
  mediaControls: false,  // NEW
  metronome: false,
  videoSettings: false
}
```

### 2. Updated JKSessionScreen Component

#### Imports Added:
```javascript
import { useDispatch, useSelector } from 'react-redux';
import { openModal, closeModal, toggleModal, selectModal } from '../../store/features/sessionUISlice';
```

#### State Migration:

**BEFORE (8 useState hooks for modals):**
```javascript
const [showSettingsModal, setShowSettingsModal] = useState(false);
const [showInviteModal, setShowInviteModal] = useState(false);
const [showVolumeModal, setShowVolumeModal] = useState(false);
const [showRecordingModal, setShowRecordingModal] = useState(false);
const [showLeaveModal, setShowLeaveModal] = useState(false);
const [showJamTrackModal, setShowJamTrackModal] = useState(false);
const [showBackingTrackPopup, setShowBackingTrackPopup] = useState(false);
const [showMediaControlsPopup, setShowMediaControlsPopup] = useState(false);
```

**AFTER (Redux selectors):**
```javascript
const dispatch = useDispatch();
const showSettingsModal = useSelector(selectModal('settings'));
const showInviteModal = useSelector(selectModal('invite'));
const showVolumeModal = useSelector(selectModal('volume'));
const showRecordingModal = useSelector(selectModal('recording'));
const showLeaveModal = useSelector(selectModal('leave'));
const showJamTrackModal = useSelector(selectModal('jamTrack'));
const showBackingTrackPopup = useSelector(selectModal('backingTrack'));
const showMediaControlsPopup = useSelector(selectModal('mediaControls'));
```

#### Action Dispatch Updates:

**Opening Modals:**
- Toolbar buttons now use: `onClick={() => dispatch(openModal('settings'))}`
- Previously: `onClick={() => setShowSettingsModal(true)}`

**Closing Modals:**
- Modal onClose handlers now use: `dispatch(closeModal('settings'))`
- Previously: `setShowSettingsModal(false)`

**Toggling Modals:**
- Modal toggle handlers now use: `dispatch(toggleModal('settings'))`
- Previously: `setShowSettingsModal(!showSettingsModal)`

### 3. Updated Modal Components

All modal components updated to use Redux actions:

1. **JKSessionSettingsModal**
   - toggle: `() => dispatch(toggleModal('settings'))`
   - onSave: closes with `dispatch(closeModal('settings'))`

2. **JKSessionInviteModal**
   - onToggle: `() => dispatch(closeModal('invite'))`
   - onSubmit: closes with `dispatch(closeModal('invite'))`

3. **JKSessionVolumeModal**
   - toggle: `() => dispatch(toggleModal('volume'))`

4. **JKSessionRecordingModal**
   - toggle: `() => dispatch(toggleModal('recording'))`

5. **JKSessionLeaveModal**
   - toggle: `() => dispatch(closeModal('leave'))`
   - onSubmit: closes with `dispatch(closeModal('leave'))`

6. **JKSessionJamTrackModal**
   - toggle: `() => dispatch(toggleModal('jamTrack'))`

7. **Backing Track Popup**
   - onClose: `dispatch(closeModal('backingTrack'))`
   - handleBackingTrackSelected: `dispatch(openModal('backingTrack'))`

8. **Media Controls Popup**
   - onClose: `dispatch(closeModal('mediaControls'))`

## Benefits Achieved

1. **Reduced Local State**: Removed 8 useState hooks from component
2. **Centralized Modal State**: All modal visibility in one Redux slice
3. **Predictable Updates**: All modal state changes tracked via Redux DevTools
4. **Better Debugging**: Can inspect modal state in Redux DevTools
5. **Consistent Pattern**: All modals follow same open/close pattern
6. **Easier Testing**: Modal logic can be tested via Redux actions

## Lines of Code Impact

- **Removed**: ~16 lines of useState declarations
- **Added**: ~8 lines of Redux selectors
- **Net Reduction**: ~8 lines of boilerplate code

## State Preserved

The following non-modal state was **intentionally kept** as local useState:
- `settingsLoading`, `inviteLoading`, `leaveLoading` - Loading states specific to modal operations
- `friends`, `sessionInvitees` - Data fetched for modals
- `volumeLevel`, `leaveRating`, `leaveComments` - Form field state within modals
- `backingTrackData` - Data for backing track popup
- `mediaControlsOpened`, `popupGuard` - Popup-specific guards

These remain as local state because they are:
1. Specific to modal/popup content, not visibility
2. Don't need to be shared across components
3. Reset when modal closes anyway

## Testing Checklist

To verify this migration works correctly:

- [ ] Open Settings modal - verify it opens
- [ ] Close Settings modal - verify it closes
- [ ] Open Invite modal - verify it opens
- [ ] Close Invite modal - verify it closes
- [ ] Open Volume modal - verify it opens
- [ ] Close Volume modal - verify it closes
- [ ] Open Recording modal - verify it opens
- [ ] Close Recording modal - verify it closes
- [ ] Click Leave Session - verify modal opens
- [ ] Close Leave modal - verify it closes
- [ ] Open JamTrack modal - verify it opens
- [ ] Close JamTrack modal - verify it closes
- [ ] Select Backing Track - verify popup opens
- [ ] Close Backing Track popup - verify it closes
- [ ] Open Redux DevTools - verify modal state updates in `sessionUI.modals`
- [ ] Verify no console errors

## Next Steps (Phase 2)

With modal state successfully migrated, you can now proceed to:

1. **Phase 2**: Migrate session lifecycle state (`hasJoined`, `sessionGuardsPassed`, etc.) to `activeSessionSlice`
2. **Phase 3**: Migrate entity collections (`userTracks`, `participants`, etc.) to Redux
3. **Phase 4**: Integrate WebSocket callbacks with Redux using `useSessionWebSocket` hook

## Files Modified

1. `src/store/features/sessionUISlice.js` - Added mediaControls modal
2. `src/components/client/JKSessionScreen.js` - Migrated all modal state to Redux

## Rollback Instructions

If you need to rollback this change:
1. `git checkout HEAD -- src/components/client/JKSessionScreen.js`
2. `git checkout HEAD -- src/store/features/sessionUISlice.js`

This will restore the previous useState-based modal management.
