// A core scenario (test/scenarios/<name>.scenario.json): a network, its
// settings and the steps to run on it. Read by the Swift comparison
// (oracle.test.ts) and the Java comparison (dhcpJava.test.ts).

import {
  deviceConfiguration,
  dhcpServerConfiguration,
  firewallConfiguration,
  firewallRule,
  interfaceKey,
  portSnapshot,
  switchConfiguration,
  topologySnapshot,
  type FirewallConfiguration,
  type ManualRoute,
  type NodeKind,
  type TopologySnapshot,
  type DnsRecordType,
} from '../src/index.js';

export interface Scenario {
  seed: number;
  speedPercent?: number;
  nodes: { id: string; kind: NodeKind; ports: { id: string; label: string; mac?: string }[] }[];
  /** `wireless`: a wireless cable (Java only: Kabel.wireless; a cable like any other at run time). */
  links: { id: string; sourceNode: string; sourcePort: string; targetNode: string; targetPort: string; wireless?: boolean }[];
  devices?: Record<string, { ip: string; mask: string; gateway?: string; dns?: string }>;
  interfaces?: { node: string; port: string; ip: string; mask: string }[];
  routes?: Record<string, { destination: string; mask: string; gateway: string; interface: string }[]>;
  switches?: Record<string, { ssid: string; retention?: number }>;
  /** Hosts with a wireless card and the SSID they join (Java only: the editor lays the cable, the simulation does not ask). */
  wireless?: Record<string, { ssid: string }>;
  firewalls?: Record<
    string,
    {
      active?: boolean;
      defaultPolicy?: 'accept' | 'drop';
      dropIcmp?: boolean;
      synOnly?: boolean;
      filterUdp?: boolean;
      rules?: {
        source?: string;
        sourceMask?: string;
        destination?: string;
        destinationMask?: string;
        port?: number;
        protocol?: 'all' | 'icmp' | 'tcp' | 'udp';
        action?: 'accept' | 'drop';
      }[];
    }
  >;
  dhcpServers?: Record<
    string,
    { active?: boolean; lower?: string; upper?: string; gateway?: string; dns?: string; own?: boolean; staticAssignments?: [string, string][] }
  >;
  dhcpClients?: string[];
  /** Home routers' port forwarding: rows of protocol, public port, LAN address, LAN port. */
  portForwarding?: Record<string, [string, string, string, string][]>;
  /** Routers with RIP switched on. */
  rip?: string[];
  /** Records as `name TYPE target` (Java's hinzuRecord: TTL 3600). */
  dnsServers?: Record<string, { records: string[]; recursive?: boolean }>;
  steps: {
    op: string;
    from?: string;
    node?: string;
    target?: string;
    ttl?: number;
    identifier?: number;
    sequence?: number;
    maxTtl?: number;
    to?: number;
    enabled?: boolean;
    percent?: number;
    // UDP: a socket is named by the id bindUdp returned.
    port?: number;
    localIp?: string;
    remoteIp?: string;
    remotePort?: number;
    socket?: string;
    payload?: string;
    timeout?: number;
    // TCP: the payload repeated this many times, for messages longer than a segment.
    repeatCount?: number;
    localPort?: number;
  }[];
}

export function snapshotOf(scenario: Scenario): TopologySnapshot {
  const firewalls = new Map<string, FirewallConfiguration>();
  for (const [node, config] of Object.entries(scenario.firewalls ?? {})) {
    firewalls.set(
      node,
      firewallConfiguration({
        isActive: config.active ?? false,
        defaultPolicy: config.defaultPolicy ?? 'drop',
        dropIcmp: config.dropIcmp ?? false,
        filterSynSegmentsOnly: config.synOnly ?? true,
        filterUdp: config.filterUdp ?? true,
        rules: (config.rules ?? []).map((rule) =>
          firewallRule({
            sourceIPAddress: rule.source ?? '',
            sourceSubnetMask: rule.sourceMask ?? '',
            destinationIPAddress: rule.destination ?? '',
            destinationSubnetMask: rule.destinationMask ?? '',
            ...(rule.port === undefined ? {} : { port: rule.port }),
            protocol: rule.protocol ?? 'tcp',
            action: rule.action ?? 'drop',
          }),
        ),
      }),
    );
  }
  return topologySnapshot({
    nodes: scenario.nodes.map((node) => ({
      id: node.id,
      kind: node.kind,
      ports: node.ports.map((port) => portSnapshot(port.id, port.label, port.mac)),
    })),
    links: scenario.links.map((link) => ({
      id: link.id,
      sourceNodeId: link.sourceNode,
      sourcePortId: link.sourcePort,
      targetNodeId: link.targetNode,
      targetPortId: link.targetPort,
    })),
    deviceConfigurations: new Map(
      Object.entries(scenario.devices ?? {}).map(([node, device]) => [
        node,
        deviceConfiguration(device.ip, device.mask, device.gateway ?? '', device.dns ?? ''),
      ]),
    ),
    interfaceConfigurations: new Map(
      (scenario.interfaces ?? []).map((item) => [
        interfaceKey(item.node, item.port),
        { ipAddress: item.ip, subnetMask: item.mask },
      ]),
    ),
    manualRoutesByNodeId: new Map(
      Object.entries(scenario.routes ?? {}).map(([node, rows]) => [
        node,
        rows.map(
          (row): ManualRoute => ({
            destinationNetwork: row.destination,
            subnetMask: row.mask,
            gateway: row.gateway,
            interfaceIPAddress: row.interface,
          }),
        ),
      ]),
    ),
    dhcpServerConfigurationsByNodeId: new Map(
      Object.entries(scenario.dhcpServers ?? {}).map(([node, config]) => [
        node,
        dhcpServerConfiguration({
          isActive: config.active ?? false,
          lowerBoundIPAddress: config.lower ?? '0.0.0.0',
          upperBoundIPAddress: config.upper ?? '0.0.0.0',
          gatewayIPAddress: config.gateway ?? '0.0.0.0',
          dnsServerIPAddress: config.dns ?? '0.0.0.0',
          useOwnSettings: config.own ?? false,
          staticAssignments: (config.staticAssignments ?? []).map(([macAddress, ipAddress], index) => ({
            id: `static-${index}`,
            macAddress,
            ipAddress,
          })),
        }),
      ]),
    ),
    dhcpClientConfigurationsByNodeId: new Map((scenario.dhcpClients ?? []).map((node) => [node, { isEnabled: true }])),
    ripEnabledByNodeId: new Map((scenario.rip ?? []).map((node) => [node, true])),
    portForwardingRowsByNodeId: new Map(
      Object.entries(scenario.portForwarding ?? {}).map(([node, rows]) => [
        node,
        rows.map(([protocolValue, publicPortValue, lanIPAddress, lanPortValue]) => ({ protocolValue, publicPortValue, lanIPAddress, lanPortValue })),
      ]),
    ),
    switchConfigurationsByNodeId: new Map(
      Object.entries(scenario.switches ?? {}).map(([node, config]) => [
        node,
        config.retention === undefined ? switchConfiguration(config.ssid) : switchConfiguration(config.ssid, config.retention),
      ]),
    ),
    dnsServerConfigurationsByNodeId: new Map(
      Object.entries(scenario.dnsServers ?? {}).map(([node, config]) => [
        node,
        {
          recursiveResolutionEnabled: config.recursive ?? false,
          records: config.records.map((line) => {
            const [name = '', type = 'A', target = ''] = line.split(' ');
            const nameServerOrMail = type === 'NS' || type === 'MX';
            return {
              name: name.replace(/\.$/, '').toLowerCase() || '.',
              type: type as DnsRecordType,
              ttlSeconds: 3600,
              target: nameServerOrMail && !target.endsWith('.') ? `${target}.` : target,
            };
          }),
        },
      ]),
    ),
    firewallConfigurationsByNodeId: firewalls,
  });
}