// Test fixtures, ported from the private helpers of
// filius-ipad ios/FiliusPadTests/TopologyNetworkRuntimeEngineTests.swift.

import {
  deviceConfiguration,
  NetworkRuntimeEngine,
  portSnapshot,
  topologySnapshot,
  type DeviceConfiguration,
  type Id,
  type LinkSnapshot,
  type NodeSnapshot,
  type TopologySnapshotInput,
} from '../src/index.js';

let linkCounter = 0;

/** Swift uses a fresh `UUID()` per link; a counter keeps runs reproducible. */
export function link(sourceNodeId: Id, sourcePortId: Id, targetNodeId: Id, targetPortId: Id): LinkSnapshot {
  linkCounter += 1;
  return {
    id: `ffffffff-0000-0000-0000-${linkCounter.toString(16).padStart(12, '0')}`,
    sourceNodeId,
    sourcePortId,
    targetNodeId,
    targetPortId,
  };
}

export function pc(nodeId: Id, portId: Id): NodeSnapshot {
  return { id: nodeId, kind: 'pc', ports: [portSnapshot(portId, 'eth0')] };
}

export function device(ipAddress: string, options: { mask?: string; gateway?: string } = {}): DeviceConfiguration {
  return deviceConfiguration(ipAddress, options.mask ?? '255.255.255.0', options.gateway ?? '');
}

export function startedEngine(
  input: TopologySnapshotInput,
  seed: number = 14,
): NetworkRuntimeEngine {
  const engine = new NetworkRuntimeEngine(seed);
  engine.handle({ type: 'start', snapshot: topologySnapshot(input), seed, initialTimeMilliseconds: 0 });
  return engine;
}

/** `00000000-0000-0000-0000-` followed by twelve hex digits. */
export function uuid(suffix: number): Id {
  return `00000000-0000-0000-0000-${suffix.toString(16).toUpperCase().padStart(12, '0')}`;
}