# G3 Console Implementation Fixes

## Summary of Changes

This document outlines all the critical fixes applied to address the coach's feedback.

## 1. Fixed Zombie Process Bug ✅

**Problem**: Launching g3 instances created zombie processes because child processes weren't properly detached.

**Solution** (`src/process/controller.rs`):
- Added `unsafe` block with `libc::setsid()` to create a new session for child processes
- Used `std::mem::forget(child)` to prevent waiting on the child process
- This fully detaches the child from the parent's process group
- Added `libc` dependency to `Cargo.toml`

```rust
unsafe {
    cmd.pre_exec(|| {
        libc::setsid();
        Ok(())
    });
}
let child = cmd.spawn()?;
let pid = child.id();
std::mem::forget(child); // Don't wait - let it run independently
```

## 2. Implemented State Persistence ✅

**Problem**: Console state was never loaded or saved, despite having the infrastructure.

**Solution**:
- Created `src/api/state.rs` with `get_state()` and `save_state()` endpoints
- Added state routes to main.rs: `GET /api/state` and `POST /api/state`
- Frontend (`js/state.js`) now loads state on startup and saves on changes
- State persists to `~/.config/g3/console-state.json`
- Persisted data includes:
  - Theme preference (dark/light)
  - Last workspace directory
  - G3 binary path
  - Last used provider and model

## 3. Implemented Restart Functionality ✅

**Problem**: Restart endpoint returned `NOT_IMPLEMENTED` error.

**Solution**:
- Added `LaunchParams` struct to store original launch parameters
- Modified `ProcessController` to store launch params in a `HashMap<u32, LaunchParams>`
- Added `get_launch_params()` method to retrieve stored parameters
- Implemented `restart_instance()` to:
  1. Extract PID from instance ID
  2. Retrieve stored launch params
  3. Launch new instance with same parameters
  4. Return new instance ID

```rust
pub struct LaunchParams {
    pub workspace: PathBuf,
    pub provider: String,
    pub model: String,
    pub prompt: String,
    pub autonomous: bool,
    pub g3_binary_path: Option<String>,
}
```

## 4. Rewrote Frontend to Vanilla JavaScript ✅

**Problem**: JSX/React files require transpilation with npm/node.js, violating the "no npm" requirement.

**Solution**: Complete rewrite using vanilla JavaScript with no build step required.

### New Frontend Structure:

```
web/
├── index.html          # Main HTML with CDN links for Marked.js and Highlight.js
├── js/
│   ├── api.js         # API client (fetch-based)
│   ├── state.js       # State management
│   ├── components.js  # UI component rendering functions
│   ├── router.js      # Client-side routing
│   └── app.js         # Main application logic
└── styles/
    └── app.css        # Complete styling (Hero UI inspired)
```

### Key Features:

**No Build Step Required**:
- Pure JavaScript (ES6+)
- No JSX, no transpilation
- Direct browser execution
- CDN-loaded libraries (Marked.js for Markdown, Highlight.js for syntax highlighting)

**Component System**:
- Template literal-based rendering
- Functions return HTML strings
- Dynamic DOM updates via `innerHTML`

**Routing**:
- Client-side routing with History API
- Home page: `/`
- Detail page: `/instance/:id`

**State Management**:
- Simple object-based state
- Automatic persistence via API
- Theme switching with CSS variables

**Styling**:
- CSS custom properties for theming
- Dark and light themes
- Hero UI-inspired design
- Responsive layout

## 5. Additional Improvements

### Visual Feedback
- Modal shows "Starting..." during launch
- Buttons disable during operations
- Loading spinners for async operations
- Status badges with color coding

### Markdown & Syntax Highlighting
- Marked.js for Markdown rendering in chat messages
- Highlight.js for code block syntax highlighting
- Applied automatically to all code blocks

### Auto-Refresh
- Home page refreshes every 5 seconds
- Detail page refreshes every 3 seconds
- Only refreshes current route

### File Browser Note
- HTML5 file input has limited directory picker support
- Users must manually enter paths (browser limitation)
- Alert messages guide users

## Testing Checklist

- [ ] Backend compiles without errors ✅
- [ ] Frontend loads without build step ✅
- [ ] State persists between sessions
- [ ] Launch new instance works
- [ ] Kill instance works
- [ ] Restart instance works (no longer returns NOT_IMPLEMENTED)
- [ ] No zombie processes created
- [ ] Theme toggle works
- [ ] Markdown rendering works
- [ ] Syntax highlighting works
- [ ] Auto-refresh works

## Files Modified

### Backend:
- `src/process/controller.rs` - Fixed zombie processes, added launch params storage
- `src/process/detector.rs` - Added `launch_params` field to Instance
- `src/models/instance.rs` - Added `LaunchParams` struct
- `src/api/control.rs` - Implemented restart functionality
- `src/api/state.rs` - NEW: State persistence endpoints
- `src/api/mod.rs` - Added state module
- `src/main.rs` - Added state routes
- `Cargo.toml` - Added `libc` dependency

### Frontend (Complete Rewrite):
- `web/index.html` - NEW: Vanilla HTML with CDN links
- `web/js/api.js` - NEW: API client
- `web/js/state.js` - NEW: State management
- `web/js/components.js` - NEW: UI components
- `web/js/router.js` - NEW: Client-side router
- `web/js/app.js` - NEW: Main application
- `web/styles/app.css` - NEW: Complete styling

### Removed:
- All `.jsx` files (no longer needed)
- `package.json` (no npm required)
- `vite.config.js` (no build step)

## Compilation Status

✅ **Backend compiles successfully** with 20 warnings (all unused imports, no errors)

```bash
cd crates/g3-console && cargo build --release
# Finished `release` profile [optimized] target(s) in 3.74s
```

## Next Steps

1. Test with WebDriver to validate all functionality
2. Launch a real g3 instance and verify no zombie processes
3. Test restart functionality with stored parameters
4. Verify state persistence across console restarts
5. Test theme switching and UI responsiveness

## Implementation Status: ~85% Complete

**Completed**:
- ✅ Zombie process fix
- ✅ State persistence
- ✅ Restart functionality
- ✅ Vanilla JavaScript frontend (no build step)
- ✅ Markdown rendering
- ✅ Syntax highlighting
- ✅ Theme switching
- ✅ Auto-refresh
- ✅ Modal for new runs

**Remaining** (lower priority):
- Log parsing for accurate stats
- Git status detection
- Project files preview
- Multi-segment progress bars for ensemble mode
- Enhanced status detection (completed/failed/idle)