# koring-launcher

Minecraft launcher built with Electron + React 19 + TypeScript + Node.js (@xmcl).

## Quick commands

```bash
pnpm dev                # full app dev (renderer + main process)
pnpm dev:renderer       # frontend only (vite, port 1420)
pnpm dev:main           # electron main process only
pnpm build              # production build (vite + tsc)
pnpm dist:dev           # dev icon + Windows installer
pnpm dist:beta          # beta icon + Windows installer
pnpm dist:run           # production icon + Windows installer
```

## Architecture

- **Frontend** (`src/`): React 19 + Vite 7 + Tailwind v4 + shadcn/ui + Zustand stores
- **Main Process** (`electron/`): Node.js/TypeScript, manages windows, IPC handlers, @xmcl/* packages
- **Icon System** (`public/icons/{dev,beta,run}/`): Mode-specific icons, copied to `build/` at build time
- IPC: Frontend → `ipcRenderer.invoke()` → `ipcMain.handle()` → main process → `webContents.send()` → Frontend

## Key gotchas

- **Electron main process**: `electron/main.ts` is the entry point. All @xmcl/* packages run here.
- **Preload script**: `electron/preload.ts` exposes `window.electronAPI` via context bridge.
- **IPC handlers**: All handlers are in `electron/handlers/` directory.
- **Mutable win ref**: `electron/main.ts` uses a mutable `win` object — handlers read `win.mainWindow` at runtime, not at registration time.
- **Config**: YAML format (`Koring.yml`) stored next to executable. Sparse save (only non-default values).
- **Auth**: JSON file (`koring-auth.json`) stored next to executable.
- **Path alias**: `@/` maps to `src/` (configured in `vite.config.ts` and `tsconfig.json`).
- **Dev mode**: Vite runs on port 1420, Electron loads from localhost.
- **Asset paths**: Use `import.meta.env.BASE_URL` prefix for public assets. Absolute paths break in packaged app.

## Build & bundle

```bash
pnpm build              # Vite build + TypeScript compile
pnpm dist:dev           # switch-icon dev + electron-builder Windows installer
pnpm dist:beta          # switch-icon beta + electron-builder Windows installer
pnpm dist:run           # switch-icon run + electron-builder Windows installer
```

Each `dist:*` command runs: `pnpm build` → `pnpm icon:{mode}` → `electron-builder --win`

## Icon switching

```
public/icons/
  dev/icon.ico, icon.png
  beta/icon.ico, icon.png
  run/icon.ico, icon.png

build/                   ← generated by switch-icon.js (gitignored)
  icon.ico
  icon.png
```

`electron-builder.yml` uses `buildResources: build` to read icons from `build/`.

## Electron notes

- `electron/main.ts`: App entry, window management, splash→main transition (ready-to-show + 1.5s min)
- `electron/preload.ts`: Context bridge for secure IPC
- `electron/config.ts`: YAML config management (sparse save)
- `electron/auth.ts`: Auth data persistence (JSON file)
- `electron/core/`: @xmcl/* integrations (auth, installer, launcher, modrinth, instance)
- `electron/handlers/`: IPC handlers (config, auth, install, launch, mods, instance, background, task, system, window)

## Frontend notes

- `src/api/ipc.ts`: Core IPC utilities (invoke, onIpcEvent)
- `src/api/*.ts`: API modules wrapping IPC calls
- `src/stores/`: Zustand state management
- `src/hooks/useTheme.ts`: Dark mode sync with Electron theme
- `src/components/system/WindowControls.tsx`: Custom window controls (min/max/close), uses `<button>` with `WebkitAppRegion: "no-drag"`
- `src/components/system/TitleBar.tsx`: Custom title bar with navigation, uses `WebkitAppRegion: "drag"`
- `src/lib/mode.ts`: Build mode constants (`DEFAULT_BG`, `LOGO_SVG`, `APP_ICON`, `BUILD_MODE`)