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

// Command map for the edge side of remoteingress-bin
type TEdgeCommands = {
  ping: {
    params: Record<string, never>;
    result: { pong: boolean };
  };
  startEdge: {
    params: {
      hubHost: string;
      hubPort: number;
      edgeId: string;
      secret: string;
    };
    result: { started: boolean };
  };
  stopEdge: {
    params: Record<string, never>;
    result: { stopped: boolean; wasRunning?: boolean };
  };
  getEdgeStatus: {
    params: Record<string, never>;
    result: {
      running: boolean;
      connected: boolean;
      publicIp: string | null;
      activeStreams: number;
      listenPorts: number[];
    };
  };
};

export interface IEdgeConfig {
  hubHost: string;
  hubPort?: number;
  edgeId: string;
  secret: string;
}

export class RemoteIngressEdge extends EventEmitter {
  private bridge: InstanceType<typeof plugins.smartrust.RustBridge<TEdgeCommands>>;
  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<TEdgeCommands>({
      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:tunnelConnected', () => {
      this.emit('tunnelConnected');
    });
    this.bridge.on('management:tunnelDisconnected', () => {
      this.emit('tunnelDisconnected');
    });
    this.bridge.on('management:publicIpDiscovered', (data: { ip: string }) => {
      this.emit('publicIpDiscovered', data);
    });
  }

  /**
   * Start the edge — spawns the Rust binary and connects to the hub.
   * Accepts either a connection token or an explicit IEdgeConfig.
   */
  public async start(config: { token: string } | IEdgeConfig): Promise<void> {
    let edgeConfig: IEdgeConfig;

    if ('token' in config) {
      const decoded = decodeConnectionToken(config.token);
      edgeConfig = {
        hubHost: decoded.hubHost,
        hubPort: decoded.hubPort,
        edgeId: decoded.edgeId,
        secret: decoded.secret,
      };
    } else {
      edgeConfig = config;
    }

    const spawned = await this.bridge.spawn();
    if (!spawned) {
      throw new Error('Failed to spawn remoteingress-bin');
    }

    await this.bridge.sendCommand('startEdge', {
      hubHost: edgeConfig.hubHost,
      hubPort: edgeConfig.hubPort ?? 8443,
      edgeId: edgeConfig.edgeId,
      secret: edgeConfig.secret,
    });

    this.started = true;
  }

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

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

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