// Preload — the thin bridge between renderer and main.
//
// Everything exposed here is visible in the renderer as `window.dchain`.
// We explicitly pick which IPC channels to surface rather than exposing
// `ipcRenderer` wholesale, so a compromised renderer can't spam
// arbitrary channels.

import { contextBridge, ipcRenderer } from 'electron';

interface OpenDialogOptions {
  title?: string;
  defaultPath?: string;
  filters?: { name: string; extensions: string[] }[];
  properties?: ('openFile' | 'multiSelections')[];
}

interface SaveDialogOptions {
  title?: string;
  defaultPath?: string;
  filters?: { name: string; extensions: string[] }[];
}

const api = {
  keyfile: {
    load:   (): Promise<string | null>  => ipcRenderer.invoke('keyfile:load'),
    save:   (json: string): Promise<void> => ipcRenderer.invoke('keyfile:save', json),
    delete: (): Promise<void>           => ipcRenderer.invoke('keyfile:delete'),
    encryptionAvailable: (): Promise<boolean> =>
      ipcRenderer.invoke('keyfile:encryption-available'),
  },
  dialog: {
    openFile: (opts: OpenDialogOptions): Promise<string | null> =>
      ipcRenderer.invoke('dialog:open-file', opts),
    saveFile: (opts: SaveDialogOptions): Promise<string | null> =>
      ipcRenderer.invoke('dialog:save-file', opts),
  },
  fs: {
    readText:  (p: string): Promise<string> => ipcRenderer.invoke('fs:read-text', p),
    writeText: (p: string, c: string): Promise<void> =>
      ipcRenderer.invoke('fs:write-text', p, c),
  },
  app: {
    version:  (): Promise<string> => ipcRenderer.invoke('app:version'),
    platform: (): Promise<string> => ipcRenderer.invoke('app:platform'),
  },
};

export type DChainAPI = typeof api;

contextBridge.exposeInMainWorld('dchain', api);