# HANDOFF — Session State

## Branch
`main` — clean, last push `8951141` (TASK 10 shipped). TRAX meter fix pushed `e06bfa4`.
All Control Surface UX work is **uncommitted** — build passes 0 warnings/0 errors.

## ⚠️ IN FLIGHT: repo-wide Backdrop→Background rename (multi-session)
Models already renamed (`Source.IsBackground`, `Scene.HasBackground`/`CustomBackgroundPath`,
`SceneCatalog.HasBackground`, `Source` enum `Background`). Status per file:
- ✅ `ViewModels/MainViewModel.cs` — full case-sensitive rename done; compiles clean.
- ✅ `MainWindow.xaml.cs` + `MainWindow.xaml` — renamed; full solution builds 0 warnings/0 errors.
- ✅ `Services/Compositor/SceneCompositor.cs` — CS0128 duplicate locals fixed.
- ⏳ `Services/LayoutStore.cs` — C# members renamed, but DB column strings
  (`HasBackdrop`/`IsBackdrop`) are **schema** and intentionally still say Backdrop:
  renaming them needs a real migration (new user_version) touching every existing DB.
  The V5-backfill unit test's raw CREATE TABLE must keep `IsBackdrop` to match —
  blanket-renaming it breaks `V5_Database_Backfill_Removes_NonLive_Backgrounds`
  (verified: migration can't see flags, Live source loses `IsBackground`).
- ✅ `ytLive.Tests` — all 5 files blanket-renamed (class/method/var/comment names +
  C# property accesses); `BackdropTests.cs` → `BackgroundTests.cs`. Tests: 207/208 pass;
  the only red is pre-existing `AudioPipelineTests.Mix_HonorsProviderGains_AndGameMute_KillsTheLoopback`
  (unrelated gain-math assert at AudioPipelineTests.cs:373, zero backdrop occurrences).
- Pending elsewhere: leftover "backdrop" doc comments (`Source.cs`, `SceneCatalog.cs`,
  `ScreenCaptureManager.cs`, `ScreenCaptureFrameSource.cs`, `MainWindow.xaml:769`),
  asset files + csproj (`Assets/*-backdrop.jpg` — pack-URI strings in MainViewModel now say
  `-background.jpg` so default-scene seeding silently no-ops until assets+csproj are renamed).

## What shipped this session

1. **TASK 10 — Polar billing + Velopack auto-updates (steps 1–7)** — full license key activation flow
2. **TRAX meter double-attenuation fix** — removed redundant slider multiplication
3. **LAN infrastructure documented** — all servers in `ai.md` + `CREDENTIALS.md`
4. **llamavault NFS/SMB diagnosis** — zombie SMB session from power outage, fixed by killing stale PID

## Active work: Control Surface UX (TASK 19/23 merged) — ALL PHASES COMPLETE

**Design philosophy:** Director's control surface, not an editor. Five scene monitors above one central live monitor. Click thumbnail = transition (live) or stage (offline). Edit mode only when offline. Live/Recording = read-only. Right-click + drag locked when live.

### Phases completed (ALL)
1. ✅ **Phase 1:** `StagedScene`/`LiveScene` split + `IsEditMode` in MainViewModel
2. ✅ **Phase 2:** Left panel two-state (edit: layers+props, live: chat)
3. ✅ **Phase 3:** Right panel eliminated
4. ✅ **Phase 4:** Thumbnail strip above center monitor + `Scene.Snapshot` + placeholder snapshots
5. ✅ **Phase 5:** Edit-mode gating (drag/resize/context menus blocked when live)
6. ✅ **Phase 6:** `TransitionService.cs` (Cut/Fade/Move) + `SceneCompositor.BlendFrames()`
7. ✅ **Phase 7:** `FramePump` integrated with `TransitionService`
8. ✅ **Phase 8:** Thumbnail click → `TransitionToScene()` wiring
9. ✅ **Phase 9:** Brand rename "ytLlive" → "LlamaCasty" (user-visible strings)
10. ✅ **Phase 10:** `LayoutStore.SaveTransitionSettings()` / `LoadTransitionSettings()`

### Key decisions
- **Mode is implicit:** offline = edit, live/recording = read-only. No toggle button.
- **Left panel = one panel, two states:** offline → LAYERS + PROPERTIES; live → YouTube Live Chat (entire panel replaced, never coexists)
- **No (=>) transition button:** clicking a thumbnail directly triggers the transition
- **Thumbnail glow:** active scene gets brand-red `#e94560` border via `IsStaged` data trigger
- **Right panel eliminated:** chat moved to left panel (live mode only)
- **5 thumbnails above center monitor**, 120px height, uniform grid. Placeholder colored boxes until compositor snapshots added.
- **Transitions:** Cut + Fade + Move (v1). Go Live always = Cut. Duration persisted to Settings table.
- **Brand rename:** "ytLlive" → "LlamaCasty" across all XAML, VM strings, service strings. File paths (`%APPDATA%\ytLlive\`) intentionally NOT renamed.

### Architecture changes
- `ActiveScene` → split into `StagedScene` (central monitor, editable) + `LiveScene` (encoder output, read-only)
- `IsEditMode` = derived property: `StreamStatus == StreamStatus.Offline`
- `TransitionService` — transition state machine with Start/Tick/BlendFrame
- `SceneCompositor.BlendFrames()` — crossfade between two VideoFrames
- `Scene.Snapshot` + `Scene.IsStaged` — thumbnail image and staged indicator
- `FramePump` — now accepts `TransitionService` + `fromSceneProvider`, blends during transitions

### Files changed
- `ViewModels/MainViewModel.cs` — StagedScene/LiveScene split, IsEditMode, TransitionToScene, snapshots, brand rename, transition persistence
- `MainWindow.xaml` — 2-col layout, thumbnail strip, left panel two-state, right panel deleted, brand rename
- `MainWindow.xaml.cs` — Thumbnail click, edit-mode gating, context menu gating, dead code cleanup
- `Models/Scene.cs` — Snapshot, IsStaged properties
- `Services/Compositor/SceneCompositor.cs` — BlendFrames() static method
- `Services/Encoder/FramePump.cs` — transition support in render loop
- `Services/TransitionService.cs` — **new** — Cut/Fade/Move transition engine
- `Services/LayoutStore.cs` — SaveTransitionSettings/LoadTransitionSettings/UpsertSetting

### What still needs testing
- Runtime visual testing (need Windows display to run)
- Actual transition animation quality (Fade + Move)
- Thumbnail generation from real scene compositor (currently placeholder colors)
- Drag-reorder of thumbnails (not yet implemented)

## Build
```bash
taskkill.exe /F /IM ytLive.exe  # if running
"/mnt/c/Program Files/dotnet/dotnet.exe" build "C:\Users\gramp\Documents\Code\projects\ytLive\ytLive.csproj" --no-restore
```
**0 warnings, 0 errors.**

## Polar.sh resources
| Resource | ID |
|---|---|
| Org ID | `c05fb364-b967-4f6c-adf2-8a144e46d085` |
| Product | `d105dfa1-497e-423b-8cd4-e0ee2e3abbc0` |
| Price | `7c1b6f70-cf8c-46df-9bc8-6703f9fa64d0` |
| Benefit | `80f66bc1-d5a3-44a1-b9ea-1709ae508535` |
| Checkout | `70e037cd-9bcb-414e-8b26-c82c1d268f65` |
| Checkout URL | `https://buy.polar.sh/polar_cl_ueMy8AyAClO0o0yo19IroZwKTbD587gzUsjEW3bFapw` |
| Validate endpoint | `POST https://api.polar.sh/v1/customer-portal/license-keys/validate` |
| Key prefix | `LCYT-` |

## Next steps
1. **Visual testing** — run on Windows display, verify layout, transitions, thumbnail strip
2. **Thumbnail drag-reorder** — reorder scenes via drag on thumbnail strip
3. **Real snapshot generation** — replace placeholder colors with compositor-rendered thumbnails
4. **Transition dropdown UI** — add XAML control to pick transition type + duration
5. **Commit** — all this work needs to be committed once visually verified

## v1 vision
> A streaming tool that's intuitive and ready to go out-the-gate with nothing held back.
> Minimal configuration — they're ready to go live or record. Eliminate the OBS pain-point completely.