import * as plugins from './plugins.js';
import { EventEmitter } from 'events';

// Command map for the hub side of remoteingress-bin
type THubCommands = {
  ping: {
    params: Record<string, never>;
    result: { pong: boolean };
  };
  startHub: {
    params: {
      tunnelPort: number;
      targetHost?: string;
    };
    result: { started: boolean };
  };
  stopHub: {
    params: Record<string, never>;
    result: { stopped: boolean; wasRunning?: boolean };
  };
  updateAllowedEdges: {
    params: {
      edges: Array<{ id: string; secret: string; listenPorts?: number[]; stunIntervalSecs?: number }>;
    };
    result: { updated: boolean };
  };
  getHubStatus: {
    params: Record<string, never>;
    result: {
      running: boolean;
      tunnelPort: number;
      connectedEdges: Array<{
        edgeId: string;
        connectedAt: number;
        activeStreams: number;
      }>;
    };
  };
};

export interface IHubConfig {
  tunnelPort?: number;
  targetHost?: string;
}

export class RemoteIngressHub extends EventEmitter {
  private bridge: InstanceType<typeof plugins.smartrust.RustBridge<THubCommands>>;
  private started = false;

  constructor() {
    super();

    const packageDir = plugins.path.resolve(
      plugins.path.dirname(new URL(import.meta.url).pathname),
      '..',
    );

    this.bridge = new plugins.smartrust.RustBridge<THubCommands>({
      binaryName: 'remoteingress-bin',
      cliArgs: ['--management'],
      requestTimeoutMs: 30_000,
      readyTimeoutMs: 10_000,
      localPaths: [
        // Platform-suffixed binary in dist_rust (production)
        plugins.path.join(packageDir, 'dist_rust', `remoteingress-bin_${process.platform === 'win32' ? 'windows' : 'linux'}_${process.arch === 'x64' ? 'amd64' : process.arch}`),
        // Exact binaryName fallback in dist_rust
        plugins.path.join(packageDir, 'dist_rust', 'remoteingress-bin'),
        // Development build paths (cargo output uses exact name)
        plugins.path.join(packageDir, 'rust', 'target', 'release', 'remoteingress-bin'),
        plugins.path.join(packageDir, 'rust', 'target', 'debug', 'remoteingress-bin'),
      ],
      searchSystemPath: false,
    });

    // Forward events from Rust binary
    this.bridge.on('management:edgeConnected', (data: { edgeId: string }) => {
      this.emit('edgeConnected', data);
    });
    this.bridge.on('management:edgeDisconnected', (data: { edgeId: string }) => {
      this.emit('edgeDisconnected', data);
    });
    this.bridge.on('management:streamOpened', (data: { edgeId: string; streamId: number }) => {
      this.emit('streamOpened', data);
    });
    this.bridge.on('management:streamClosed', (data: { edgeId: string; streamId: number }) => {
      this.emit('streamClosed', data);
    });
  }

  /**
   * Start the hub — spawns the Rust binary and starts the tunnel server.
   */
  public async start(config: IHubConfig = {}): Promise<void> {
    const spawned = await this.bridge.spawn();
    if (!spawned) {
      throw new Error('Failed to spawn remoteingress-bin');
    }

    await this.bridge.sendCommand('startHub', {
      tunnelPort: config.tunnelPort ?? 8443,
      targetHost: config.targetHost ?? '127.0.0.1',
    });

    this.started = true;
  }

  /**
   * Stop the hub and kill the Rust process.
   */
  public async stop(): Promise<void> {
    if (this.started) {
      try {
        await this.bridge.sendCommand('stopHub', {} as Record<string, never>);
      } catch {
        // Process may already be dead
      }
      this.bridge.kill();
      this.started = false;
    }
  }

  /**
   * Update the list of allowed edges that can connect to this hub.
   */
  public async updateAllowedEdges(edges: Array<{ id: string; secret: string; listenPorts?: number[]; stunIntervalSecs?: number }>): Promise<void> {
    await this.bridge.sendCommand('updateAllowedEdges', { edges });
  }

  /**
   * Get the current hub status.
   */
  public async getStatus() {
    return this.bridge.sendCommand('getHubStatus', {} as Record<string, never>);
  }

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