import * as plugins from '../plugins.js';
import type { IRemoteIngressStatus } from '../../ts_interfaces/data/remoteingress.js';
import type { RemoteIngressManager } from './classes.remoteingress-manager.js';

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

/**
 * Manages the RemoteIngressHub instance and tracks connected edge statuses.
 */
export class TunnelManager {
  private hub: InstanceType<typeof plugins.remoteingress.RemoteIngressHub>;
  private manager: RemoteIngressManager;
  private config: ITunnelManagerConfig;
  private edgeStatuses: Map<string, IRemoteIngressStatus> = new Map();
  private reconcileInterval: ReturnType<typeof setInterval> | null = null;

  constructor(manager: RemoteIngressManager, config: ITunnelManagerConfig = {}) {
    this.manager = manager;
    this.config = config;
    this.hub = new plugins.remoteingress.RemoteIngressHub();

    // Listen for edge connect/disconnect events
    this.hub.on('edgeConnected', (data: { edgeId: string }) => {
      const existing = this.edgeStatuses.get(data.edgeId);
      this.edgeStatuses.set(data.edgeId, {
        edgeId: data.edgeId,
        connected: true,
        publicIp: existing?.publicIp ?? null,
        activeTunnels: 0,
        lastHeartbeat: Date.now(),
        connectedAt: Date.now(),
      });
    });

    this.hub.on('edgeDisconnected', (data: { edgeId: string }) => {
      this.edgeStatuses.delete(data.edgeId);
    });

    this.hub.on('streamOpened', (data: { edgeId: string; streamId: number }) => {
      const existing = this.edgeStatuses.get(data.edgeId);
      if (existing) {
        existing.activeTunnels++;
        existing.lastHeartbeat = Date.now();
      }
    });

    this.hub.on('streamClosed', (data: { edgeId: string; streamId: number }) => {
      const existing = this.edgeStatuses.get(data.edgeId);
      if (existing && existing.activeTunnels > 0) {
        existing.activeTunnels--;
      }
    });
  }

  /**
   * Start the tunnel hub and load allowed edges.
   */
  public async start(): Promise<void> {
    await this.hub.start({
      tunnelPort: this.config.tunnelPort ?? 8443,
      targetHost: this.config.targetHost ?? '127.0.0.1',
    });

    // Send allowed edges to the hub
    await this.syncAllowedEdges();

    // Periodically reconcile with authoritative Rust hub status
    this.reconcileInterval = setInterval(() => {
      this.reconcile().catch(() => {});
    }, 15_000);
  }

  /**
   * Stop the tunnel hub.
   */
  public async stop(): Promise<void> {
    if (this.reconcileInterval) {
      clearInterval(this.reconcileInterval);
      this.reconcileInterval = null;
    }
    await this.hub.stop();
    this.edgeStatuses.clear();
  }

  /**
   * Reconcile TS-side edge statuses with the authoritative Rust hub status.
   * Overwrites event-derived activeTunnels with the real activeStreams count.
   */
  private async reconcile(): Promise<void> {
    const hubStatus = await this.hub.getStatus();
    if (!hubStatus || !hubStatus.connectedEdges) return;

    const rustEdgeIds = new Set<string>();

    for (const rustEdge of hubStatus.connectedEdges) {
      rustEdgeIds.add(rustEdge.edgeId);
      const existing = this.edgeStatuses.get(rustEdge.edgeId);
      if (existing) {
        existing.activeTunnels = rustEdge.activeStreams;
        existing.lastHeartbeat = Date.now();
      } else {
        // Missed edgeConnected event — add entry
        this.edgeStatuses.set(rustEdge.edgeId, {
          edgeId: rustEdge.edgeId,
          connected: true,
          publicIp: null,
          activeTunnels: rustEdge.activeStreams,
          lastHeartbeat: Date.now(),
          connectedAt: rustEdge.connectedAt * 1000,
        });
      }
    }

    // Remove entries for edges no longer connected in Rust (missed edgeDisconnected)
    for (const edgeId of this.edgeStatuses.keys()) {
      if (!rustEdgeIds.has(edgeId)) {
        this.edgeStatuses.delete(edgeId);
      }
    }
  }

  /**
   * Sync allowed edges from the manager to the hub.
   * Call this after creating/deleting/updating edges.
   */
  public async syncAllowedEdges(): Promise<void> {
    const edges = this.manager.getAllowedEdges();
    await this.hub.updateAllowedEdges(edges);
  }

  /**
   * Get runtime statuses for all known edges.
   */
  public getEdgeStatuses(): IRemoteIngressStatus[] {
    return Array.from(this.edgeStatuses.values());
  }

  /**
   * Get status for a specific edge.
   */
  public getEdgeStatus(edgeId: string): IRemoteIngressStatus | undefined {
    return this.edgeStatuses.get(edgeId);
  }

  /**
   * Get the count of connected edges.
   */
  public getConnectedCount(): number {
    let count = 0;
    for (const status of this.edgeStatuses.values()) {
      if (status.connected) count++;
    }
    return count;
  }

  /**
   * Get the total number of active tunnels across all edges.
   */
  public getTotalActiveTunnels(): number {
    let total = 0;
    for (const status of this.edgeStatuses.values()) {
      total += status.activeTunnels;
    }
    return total;
  }
}