import { contextBridge, ipcRenderer, type IpcRendererEvent } from 'electron';
import type { AssistantBridge, ViewMode, ViewportMessage } from './shared';

function subscribe<T>(channel: string, handler: (payload: T) => void): () => void {
  const listener = (_event: IpcRendererEvent, payload: T): void => handler(payload);
  ipcRenderer.on(channel, listener);
  return () => ipcRenderer.removeListener(channel, listener);
}

const bridge: AssistantBridge = {
  desktopChrome: {
    platform: process.platform,
    titleBar: process.platform === 'darwin' ? 'mac-inset' : 'native',
  },
  get: path => ipcRenderer.invoke('api:get', path),
  post: (path, body) => ipcRenderer.invoke('api:post', path, body ?? {}),
  put: (path, body) => ipcRenderer.invoke('api:put', path, body ?? {}),
  del: path => ipcRenderer.invoke('api:delete', path),
  openPath: filePath => ipcRenderer.invoke('shell:openPath', filePath),
  meta: () => ipcRenderer.invoke('app:meta'),
  browser: {
    viewport: (message: ViewportMessage) => ipcRenderer.invoke('browser:viewport', message),
    mode: (taskId: string, mode: ViewMode) => ipcRenderer.invoke('browser:mode', { taskId, mode }),
    onState: handler => subscribe('browser:state', handler),
    onReveal: handler => subscribe('browser:reveal', handler),
    onHide: handler => subscribe('browser:hide', handler),
    onUserInput: handler => subscribe('browser:user-input', handler),
  },
};

contextBridge.exposeInMainWorld('assistant', bridge);