# TUI (Terminal User Interface)

Dibangun di atas **ratatui** + **crossterm**. Kode ada di `apps/interfaces/tui/src/`.

## Struktur Source

```
apps/interfaces/tui/src/
├── run.rs          # Event loop utama
├── state.rs        # AppStateRest — single source of truth
├── action.rs       # apply_action(): satu-satunya mutator state
├── turn.rs         # Spawn agent turn di background thread
├── lib.rs          # Re-export publik
├── controller/
│   ├── input.rs    # Key handler → Vec<Action>
│   └── command.rs  # Slash command parser
├── view/
│   ├── mod.rs      # Layout + pre_render() + draw()
│   ├── chat.rs     # Chat transcript panel (dengan display cache)
│   ├── sidebar.rs  # Sidebar: workflow, tasks, usage
│   ├── status.rs   # Status bar satu baris
│   ├── markdown.rs # Markdown → styled Span (pulldown-cmark)
│   ├── workflow.rs # Workflow/hive-mind progress panel
│   ├── theme.rs    # Tokyo Night color palette (const)
│   └── overlays/   # 16 overlay panel
└── model/          # Data model lokal TUI
```

## Render Pipeline (Per Frame)

```
run_loop_inner()  [50ms in-flight / 200ms idle]
      │
      ├── drain expired toasts (1x, bukan 2x)
      │
      ├── if dirty:
      │     view::pre_render(&mut state)   ← update cache (markdown, token count)
      │     terminal.draw(|f| view::draw(f, &state))
      │     state.dirty = false
      │
      └── poll events → apply_action → Action::Tick
```

### Optimasi Performa

| Masalah lama | Solusi saat ini |
|---|---|
| `count_tokens` (tiktoken) setiap frame | Cache `cached_token_count`, update hanya saat pesan baru |
| `render_markdown` ulang setiap frame | `display_lines_cache` di `AppStateRest`, rebuild saat `transcript_cache.dirty` |
| `Vec::remove(0)` untuk evict pesan lama | `VecDeque::pop_front()` — O(1) |
| `Mutex<bool>` untuk `turn_in_flight` | `Arc<AtomicBool>` — lock-free |
| Render terus meski idle | Skip `terminal.draw()` jika `dirty == false` |
| Poll 50ms konstan | Adaptif: 50ms saat in-flight, 200ms saat idle |
| `drain_expired_toasts` 2x per iterasi | Sekali saja di `run_loop_inner` |

## State (AppStateRest)

`AppStateRest` di `state.rs` adalah satu-satunya sumber kebenaran TUI:

```
AppStateRest {
  settings: Settings               // provider, model, dll
  app_config: AppConfig            // endpoint, env vars
  workspace_roots: Vec<PathBuf>    // working directories
  session_dir / session_id         // path sesi aktif
  memory_dir                       // direktori memory
  session_runtime: Option<SessionRuntime>  // history pesan, usage stats

  transcript_cache: TranscriptCache  // VecDeque<ChatMessageDisplay>
  scroll: ScrollState                // offset scroll pane chat
  input: InputState                  // buffer, cursor, history, autocomplete
  misc: MiscState                    // overlay aktif, toasts, flags

  turn_events: Arc<Mutex<VecDeque<TurnEvent>>>  // queue event dari agent
  turn_in_flight_flag: Arc<AtomicBool>          // apakah agent sedang jalan
  abort_flag: Arc<AtomicBool>                   // sinyal abort oleh user

  // Cache performa
  display_lines_cache: Vec<Line<'static>>  // hasil render markdown
  cached_token_count: usize                // token count terkini
  token_count_dirty: bool                  // perlu hitung ulang?
  last_render_width: u16                   // lebar terminal saat render terakhir

  dirty: bool   // perlu render ulang?
  quit: bool    // keluar dari loop?
}
```

**Aturan mutasi:**
- Dimutasi hanya dari `action.rs::apply_action()` dan `run.rs` (untuk dirty/quit)
- Semua fungsi `view/*` bersifat read-only terhadap state
- `pre_render_chat()` boleh mutasi hanya field cache (`display_lines_cache`, `cached_token_count`, `token_count_dirty`)

## Input & Actions

`controller/input.rs::handle_key()` → `Vec<Action>` → `apply_action(&mut state, action)`

Semua mutasi state melewati satu titik: `apply_action`. Controller tidak tahu *bagaimana* state diubah, hanya *action apa* yang dihasilkan.

### Action Utama

| Action | Efek |
|--------|------|
| `SubmitInput(text)` | Push ke transcript, spawn agent turn |
| `Tick` | Drain `TurnEvent` queue, update state dari hasil agent |
| `ScrollUp/Down` | Ubah `scroll.offset` |
| `OpenOverlay(v)` | Set `misc.overlay = v` |
| `Resize(w, h)` | Invalidasi cache display, set `last_render_width` |
| `AbortTurn` | Store `true` ke `abort_flag` |
| `ForceQuit` | Set `quit = true` |

## Overlays (16 Panel)

| Overlay | File | Fungsi |
|---------|------|--------|
| `Help` | `overlays/help.rs` | Daftar shortcut keyboard |
| `Settings` | `overlays/settings.rs` | Panel pengaturan |
| `Bash` | `overlays/bash.rs` | Background shell jobs |
| `QuitConfirm` | `overlays/quit_confirm.rs` | Konfirmasi keluar |
| `KeyInput` | `overlays/key_input.rs` | Capture key binding |
| `Editor` | `overlays/editor.rs` | File editor inline |
| `Effort` | `overlays/effort.rs` | Pilih level reasoning LLM |
| `Mcp` | `overlays/mcp.rs` | Manajemen MCP server |
| `Todo` | `overlays/todo.rs` | Daftar TODO |
| `Rewind` | `overlays/rewind.rs` | Navigasi history pesan |
| `Learning` | `overlays/learning.rs` | Viewer lesson |
| `Usage` | `overlays/usage.rs` | Statistik token |
| `Loading` | `overlays/loading.rs` | Spinner generik |
| `ModelSelector` | `overlays/model_selector.rs` | Pilih model LLM |
| `ClearConfirm` | `overlays/clear_confirm.rs` | Konfirmasi clear chat |

## Layout Terminal

```
┌───────────────────────────────────────────────┐
│                                               │
│   Chat Transcript              Sidebar (≥90)  │
│   (view/chat.rs)               ┌────────────┐ │
│   VecDeque messages            │ Workflow   │ │
│   + markdown cache             ├────────────┤ │
│   scrollable                   │ Tasks      │ │
│                                ├────────────┤ │
│                                │ Usage      │ │
│                                └────────────┘ │
├───────────────────────────────────────────────┤
│ ❯ Input Bar + Autocomplete dropdown           │
├───────────────────────────────────────────────┤
│ ⚡zesdex  READY │ ...center... │ tok · model  │
└───────────────────────────────────────────────┘
```

Sidebar hanya tampil jika lebar terminal ≥ 90 kolom.

## Theme

`view/theme.rs` mendefinisikan palette **Tokyo Night** sebagai `const Color`:
`PRIMARY`, `BG`, `SURFACE`, `SURFACE_ELEVATED`, `BORDER`, `TEXT`, `TEXT_DIM`, `TEXT_MUTED`, `SUCCESS`, `WARNING`, `ERROR`, `INFO`, `HIGHLIGHT`, `CODE_BG`, dll.

## Markdown Rendering

`view/markdown.rs::render_markdown(text, width, dim)`:
- Parse dengan `pulldown-cmark`
- Hasilkan `Vec<Span<'static>>` dengan styling
- Support: heading, code block, diff block (warna +/-/@@), list, blockquote, table, inline code, link
- `dim=true` → semua span memakai `TEXT_DIM` + italic (untuk tool output)
- Hasil di-cache di `AppStateRest::display_lines_cache`