import * as plugins from './smartvpn.plugins.js';
import { VpnBridge } from './smartvpn.classes.vpnbridge.js';
import type {
  IVpnServerOptions,
  IVpnServerConfig,
  IVpnStatus,
  IVpnServerStatistics,
  IVpnClientInfo,
  IVpnKeypair,
  TVpnServerCommands,
} from './smartvpn.interfaces.js';

/**
 * VPN Server — manages a smartvpn daemon in server mode.
 */
export class VpnServer extends plugins.events.EventEmitter {
  private bridge: VpnBridge<TVpnServerCommands>;
  private options: IVpnServerOptions;

  constructor(options: IVpnServerOptions) {
    super();
    this.options = options;
    this.bridge = new VpnBridge<TVpnServerCommands>({
      transport: options.transport,
      mode: 'server',
    });

    // Forward bridge events
    this.bridge.on('exit', (code: number | null, signal: string | null) => {
      this.emit('exit', { code, signal });
    });
    this.bridge.on('reconnected', () => {
      this.emit('reconnected');
    });
  }

  /**
   * Start the daemon bridge (spawn or connect).
   */
  public async start(config?: IVpnServerConfig): Promise<void> {
    const started = await this.bridge.start();
    if (!started) {
      throw new Error('VpnServer: failed to start daemon bridge');
    }
    const cfg = config || this.options.config;
    if (cfg) {
      await this.bridge.sendCommand('start', { config: cfg });
    }
  }

  /**
   * Stop the VPN server.
   */
  public async stopServer(): Promise<void> {
    await this.bridge.sendCommand('stop', {} as Record<string, never>);
  }

  /**
   * Get server status.
   */
  public async getStatus(): Promise<IVpnStatus> {
    return this.bridge.sendCommand('getStatus', {} as Record<string, never>);
  }

  /**
   * Get server statistics.
   */
  public async getStatistics(): Promise<IVpnServerStatistics> {
    return this.bridge.sendCommand('getStatistics', {} as Record<string, never>);
  }

  /**
   * List connected clients.
   */
  public async listClients(): Promise<IVpnClientInfo[]> {
    const result = await this.bridge.sendCommand('listClients', {} as Record<string, never>);
    return result.clients;
  }

  /**
   * Disconnect a specific client.
   */
  public async disconnectClient(clientId: string): Promise<void> {
    await this.bridge.sendCommand('disconnectClient', { clientId });
  }

  /**
   * Generate a new Noise keypair.
   */
  public async generateKeypair(): Promise<IVpnKeypair> {
    return this.bridge.sendCommand('generateKeypair', {} as Record<string, never>);
  }

  /**
   * Stop the daemon bridge.
   */
  public stop(): void {
    this.bridge.stop();
  }

  /**
   * Whether the bridge is running.
   */
  public get running(): boolean {
    return this.bridge.running;
  }
}