// The editor model built from a .fls file must be what the Swift import
// builds (corpus.swift.json, `state`, tools/swift-oracle) — on every corpus
// file Swift reads completely. On the others Swift loses devices (plan §13,
// M2); there Java is the reference, checked in topology.test.ts.

import { createHash } from 'node:crypto';
import { readdirSync, readFileSync, statSync } from 'node:fs';
import { dirname, join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';
import {
  defaultDisplayName,
  defaultSwitchConfiguration,
  firewallConfiguration,
  FIREWALL_PROTOCOL,
  interfaceKey,
  deepEqual,
  NetworkRuntimeEngine,
  portSnapshot,
  topologySnapshot,
  VirtualFileSystem,
  type Id,
  type NodeKind,
  type VirtualFileEntry,
} from '@mdg-filius/core';
import {
  decodeJavaBeans,
  importProject,
  readFlsArchive,
  readTopology,
  type FlsFileTree,
  type FlsNode,
  type FlsTopology,
  type ImportedProject,
} from '../src/index.js';

const corpusRoot = join(dirname(fileURLToPath(import.meta.url)), '../../../corpus');
interface SwiftSummary {
  skipped?: number;
  warnings?: string[];
  state?: unknown;
}
const swiftView = JSON.parse(readFileSync(join(corpusRoot, 'corpus.swift.json'), 'utf8')) as Record<string, SwiftSummary>;

function flsFiles(directory: string): string[] {
  return readdirSync(directory)
    .flatMap((name) => {
      const path = join(directory, name);
      return statSync(path).isDirectory() ? flsFiles(path) : name.endsWith('.fls') ? [path] : [];
    })
    .sort();
}

/** Ids a test can read: node-1, node-2, … in the order they are made. */
function counter(): () => Id {
  let next = 0;
  return () => `00000000-0000-0000-0000-${String(++next).padStart(12, '0')}`;
}

function importFile(file: string): ImportedProject {
  const values = decodeJavaBeans(readFlsArchive(new Uint8Array(readFileSync(file))).configurationXml);
  return importProject(readTopology(values), counter());
}

/** describeFileEntries' shape (tools/swift-oracle). */
function describeFileEntries(entries: VirtualFileEntry[]): unknown[] {
  return entries.map(({ path, content }) => {
    switch (content.kind) {
      case 'directory':
        return { path, kind: 'directory' };
      case 'text':
        return { path, kind: 'text', text: content.text };
      case 'binary':
      case 'image':
        return {
          path,
          kind: content.kind,
          bytes: content.data.length,
          mediaType: content.mediaType ?? null,
          sha256: createHash('sha256').update(content.data).digest('hex'),
        };
    }
  });
}

function fileEntriesOf(fileSystem: VirtualFileSystem | undefined): unknown {
  return fileSystem === undefined ? null : describeFileEntries(fileSystem.allEntries());
}

const DEFAULT_FILES = describeFileEntries(VirtualFileSystem.defaultForDevice().allEntries());
const EMPTY_FILES = describeFileEntries(new VirtualFileSystem().allEntries());

/**
 * describeSystem's shape. A firewall as the core has it without one
 * (inactive, drop, no rules) is left out: Swift keeps a configuration only
 * when the file sets a field, and the core treats both alike.
 */
function systemOf(project: ImportedProject, nodeId: Id) {
  const result: Record<string, unknown> = {};
  const switchConfiguration = project.switchConfigurations.get(nodeId);
  if (switchConfiguration !== undefined) {
    result.switch = {
      ssid: switchConfiguration.ssid === defaultSwitchConfiguration(nodeId).ssid ? '<from node id>' : switchConfiguration.ssid,
      retentionTimeMilliseconds: switchConfiguration.retentionTimeMilliseconds,
    };
  }
  const wireless = project.hostWirelessConfigurations.get(nodeId);
  if (wireless !== undefined) result.hostWireless = wireless;
  const routes = project.manualRoutesByNodeId.get(nodeId);
  if (routes !== undefined) {
    result.manualRoutes = routes.map((route) => [route.destinationNetwork, route.subnetMask, route.gateway, route.interfaceIPAddress]);
  }
  const rip = project.ripEnabledByNodeId.get(nodeId);
  if (rip !== undefined) result.ripEnabled = rip;
  const dhcpClient = project.dhcpClientConfigurations.get(nodeId);
  if (dhcpClient !== undefined) result.dhcpClient = dhcpClient.isEnabled;
  const dhcpServer = project.dhcpServerConfigurations.get(nodeId);
  if (dhcpServer !== undefined) {
    result.dhcpServer = {
      ...dhcpServer,
      staticAssignments: dhcpServer.staticAssignments.map((entry) => [entry.macAddress, entry.ipAddress]),
    };
  }
  const forwarding = project.portForwardingRowsByNodeId.get(nodeId);
  if (forwarding !== undefined) {
    result.portForwarding = forwarding.map((row) => [row.protocolValue, row.publicPortValue, row.lanIPAddress, row.lanPortValue]);
  }
  const remoteLink = project.remoteLinkConfigurations.get(nodeId);
  if (remoteLink !== undefined) result.remoteLink = remoteLink;
  const firewall = project.firewallConfigurationsByNodeId.get(nodeId);
  if (firewall !== undefined && !deepEqual(firewall, firewallConfiguration())) {
    result.firewall = {
      isActive: firewall.isActive,
      defaultPolicy: firewall.defaultPolicy === 'accept' ? 1 : 0,
      dropICMP: firewall.dropIcmp,
      filterSYNSegmentsOnly: firewall.filterSynSegmentsOnly,
      filterUDP: firewall.filterUdp,
      rules: firewall.rules.map((rule) => [
        rule.sourceIPAddress,
        rule.sourceSubnetMask,
        rule.destinationIPAddress,
        rule.destinationSubnetMask,
        rule.port,
        FIREWALL_PROTOCOL[rule.protocol],
        rule.action === 'accept' ? 1 : 0,
      ]),
    };
  }
  return result;
}

/** The shape describeImportedState (tools/swift-oracle) writes: indices instead of random ids. */
function asSwiftState(project: ImportedProject) {
  const { nodes, links } = project.graph;
  const nodeIndex = new Map(nodes.map((node, index) => [node.id, index]));
  const portIndex = (nodeId: Id, portId: Id) => nodes[nodeIndex.get(nodeId)!]!.ports.findIndex((port) => port.id === portId);
  return {
    nodes: nodes.map((node) => ({
      kind: node.kind,
      displayName: node.displayName,
      hostLabelPolicy: node.hostLabelPolicy,
      position: [node.position.x, node.position.y],
      ports: node.ports.map((port) => ({ label: port.label, mac: port.importedMacAddress ?? null, occupied: port.isOccupied })),
      device: project.deviceConfigurations.get(node.id) ?? null,
      interfaces: node.ports.map((port) => project.interfaceConfigurations.get(interfaceKey(node.id, port.id)) ?? null),
      system: systemOf(project, node.id),
      fileSystem: fileEntriesOf(project.virtualFileSystems.get(node.id)),
    })),
    links: links.map((link) => [
      nodeIndex.get(link.sourceNodeId),
      portIndex(link.sourceNodeId, link.sourcePortId),
      nodeIndex.get(link.targetNodeId),
      portIndex(link.targetNodeId, link.targetPortId),
    ]),
    documentation: project.documentationItems.map((item) => ({
      id: item.id,
      kind: item.kind,
      frame: [item.frame.x, item.frame.y, item.frame.width, item.frame.height],
      text: item.text,
      color: [item.color.red, item.color.green, item.color.blue, item.color.alpha],
      fontName: item.fontName,
      fontSize: item.fontSize,
      isBold: item.isBold,
      order: item.order,
    })),
  };
}

/** Java's name for a device the file leaves unnamed (German FILIUS), where Swift uses its own. */
const JAVA_DEFAULT_NAMES: Partial<Record<NodeKind, string>> = {
  networkSwitch: 'Switch / WLAN',
  gateway: 'Heimrouter',
};

/**
 * Swift's state with the one intended difference applied: a node the file
 * leaves unnamed has Java's default name, not Swift's ("Switch / WLAN", not
 * "Switch"). A node the file names like Swift's default would fail here, not
 * pass unnoticed.
 */
function withJavaDefaultNames(state: unknown): unknown {
  const { nodes, ...rest } = state as { nodes: { kind: NodeKind; displayName: string; fileSystem: unknown }[] };
  return {
    ...rest,
    nodes: nodes.map((node) => {
      const named =
        node.displayName === defaultDisplayName(node.kind) && JAVA_DEFAULT_NAMES[node.kind] !== undefined
          ? { ...node, displayName: JAVA_DEFAULT_NAMES[node.kind] }
          : node;
      // A host the file gives no files: empty, as in Java — Swift fills in
      // the demo files of a new device.
      return deepEqual(named.fileSystem, DEFAULT_FILES) ? { ...named, fileSystem: EMPTY_FILES } : named;
    }),
  };
}

/**
 * Where the Swift import is wrong and Java (corpus.java.json) is right, per
 * file and node: the corrected fields.
 */
const SWIFT_ERRORS: Record<string, Record<number, { displayName: string; hostLabelPolicy: string }>> = {
  // useIPAsName is `<object idref="Boolean0"/>`, the shared result of a
  // button's isEnabled() — true. Swift's reader cannot follow it: it shows
  // the label text as a manual name instead of the IP address.
  'java-examples/multicast_server.fls': {
    0: { displayName: 'Rechner', hostLabelPolicy: 'ipAddress' },
    1: { displayName: 'Notebook', hostLabelPolicy: 'ipAddress' },
    2: { displayName: 'Notebook', hostLabelPolicy: 'ipAddress' },
  },
};

function withSwiftErrorsCorrected(name: string, state: unknown): unknown {
  const corrections = SWIFT_ERRORS[name] ?? {};
  const { nodes, ...rest } = state as { nodes: object[] };
  return { ...rest, nodes: nodes.map((node, index) => ({ ...node, ...corrections[index] })) };
}

/**
 * What applications do to a file system, which the applications step ports:
 * Swift keeps the e-mail and Gnutella state as files (left out on both
 * sides here), and moves a web server's /webserver to /www (compared here
 * by reading our /webserver as /www where Swift has one). Everything else
 * in a file system must match.
 */
const APPLICATION_DIRECTORIES = ['/mail', '/mailserver', '/peer2peer'];

type FileEntries = { path: string }[] | null;

function withoutApplicationDirectories(state: unknown, webRootOf?: (index: number) => boolean): unknown {
  const { nodes, ...rest } = state as { nodes: { fileSystem: FileEntries }[] };
  const outside = (entry: { path: string }) =>
    !APPLICATION_DIRECTORIES.some((directory) => entry.path === directory || entry.path.startsWith(`${directory}/`));
  const asWebRoot = (entry: { path: string }) =>
    entry.path === '/webserver' || entry.path.startsWith('/webserver/')
      ? { ...entry, path: `/www${entry.path.slice('/webserver'.length)}` }
      : entry;
  return {
    ...rest,
    nodes: nodes.map((node, index) => {
      if (node.fileSystem === null) return node;
      const entries = node.fileSystem.filter(outside).map((entry) => (webRootOf?.(index) ? asWebRoot(entry) : entry));
      return { ...node, fileSystem: entries.sort((lhs, rhs) => (lhs.path < rhs.path ? -1 : lhs.path > rhs.path ? 1 : 0)) };
    }),
  };
}

/** Whether Swift moved node `index`'s web files to /www. */
function swiftWebRoots(state: unknown): (index: number) => boolean {
  const { nodes } = state as { nodes: { fileSystem: FileEntries }[] };
  return (index) => nodes[index]?.fileSystem?.some((entry) => entry.path === '/www') ?? false;
}

const complete = (summary: SwiftSummary) =>
  summary.skipped === 0 && !(summary.warnings ?? []).some((warning) => warning.startsWith('Skipped'));

describe('corpus: the imported model as Swift builds it', () => {
  const files = flsFiles(corpusRoot).filter((file) => complete(swiftView[relative(corpusRoot, file)]!));

  it('has files to compare', () => {
    expect(files.length).toBe(13);
  });

  for (const file of files) {
    const name = relative(corpusRoot, file);
    it(name, () => {
      const project = importFile(file);

      const expected = withSwiftErrorsCorrected(name, withJavaDefaultNames(swiftView[name]!.state));
      expect(withoutApplicationDirectories(asSwiftState(project), swiftWebRoots(expected))).toEqual(
        withoutApplicationDirectories(expected),
      );
      expect(project.warnings).toEqual([]);
    });
  }
});

describe('corpus: every file imports completely', () => {
  const javaView = JSON.parse(readFileSync(join(corpusRoot, 'corpus.java.json'), 'utf8')) as Record<
    string,
    { nodes: unknown[]; cables: unknown[]; documentation: unknown[] }
  >;

  // Also the files where Swift loses devices: as many devices and cables as
  // Java has, and nothing left out.
  for (const file of flsFiles(corpusRoot)) {
    const name = relative(corpusRoot, file);
    it(name, () => {
      const project = importFile(file);

      expect(project.graph.nodes).toHaveLength(javaView[name]!.nodes.length);
      expect(project.graph.links).toHaveLength(javaView[name]!.cables.length);
      expect(project.warnings).toEqual([]);
    });
  }
});

/** The core started on an imported project (the editor will derive this snapshot from its state). */
function startedEngine(project: ImportedProject): NetworkRuntimeEngine {
  const engine = new NetworkRuntimeEngine(14);
  engine.handle({
    type: 'start',
    snapshot: topologySnapshot({
      nodes: project.graph.nodes.map((node) => ({
        id: node.id,
        kind: node.kind,
        ports: node.ports.map((port) => portSnapshot(port.id, port.label, port.importedMacAddress)),
      })),
      links: project.graph.links,
      deviceConfigurations: project.deviceConfigurations,
      interfaceConfigurations: project.interfaceConfigurations,
      manualRoutesByNodeId: project.manualRoutesByNodeId,
      ripEnabledByNodeId: project.ripEnabledByNodeId,
      firewallConfigurationsByNodeId: project.firewallConfigurationsByNodeId,
      switchConfigurationsByNodeId: project.switchConfigurations,
    }),
    seed: 14,
    initialTimeMilliseconds: 0,
  });
  return engine;
}

describe('an imported file runs in the simulation core', () => {
  it('pings across the router from the notebook with a gateway, not from the one without', () => {
    const project = importFile(join(corpusRoot, 'java-examples/zwei_rechnernetze_komplett.fls'));
    const byName = (displayName: string) => project.graph.nodes.find((node) => node.displayName === displayName)!.id;
    const engine = startedEngine(project);

    expect(engine.sendIcmpEcho(byName('Notebook 1.10'), '141.99.2.10').type).toBe('delivered');
    expect(engine.sendIcmpEcho(byName('Notebook 1.11'), '141.99.2.10')).toMatchObject({ type: 'icmpError', kind: 'destinationNetworkUnreachable' });
    expect(engine.sendIcmpEcho(byName('Notebook 1.11'), '141.99.1.10').type).toBe('delivered');
  });

  it('pings across three routers on manual routes and the routers\' default gateways', () => {
    // Router 1 (141.99.1/2) sends everything else to 2.2; router 2 has manual
    // routes to 1.0 and 5.0; router 3 (141.99.4/5) sends everything else to
    // 4.1. The way back needs router 3's default gateway — which Swift drops.
    const project = importFile(join(corpusRoot, 'java-examples/internetwork_komplett.fls'));
    const notebook = project.graph.nodes.find((node) => node.displayName === 'Notebook 1.10')!.id;
    const routers = project.graph.nodes.filter((node) => node.kind === 'router').map((node) => node.id);

    expect(routers.map((router) => project.deviceConfigurations.get(router)?.defaultGateway)).toEqual([
      '141.99.2.2',
      '141.99.4.2',
      '141.99.4.1',
    ]);
    expect(startedEngine(project).sendIcmpEcho(notebook, '141.99.5.10').type).toBe('delivered');

    const withoutRouterGateways = { ...project, deviceConfigurations: new Map(project.deviceConfigurations) };
    for (const router of routers) withoutRouterGateways.deviceConfigurations.delete(router);
    expect(startedEngine(withoutRouterGateways).sendIcmpEcho(notebook, '141.99.5.10').type).not.toBe('delivered');
  });
});

// ── Rules the corpus does not exercise ─────────────────────────────────────

function flsNode(javaClass: FlsNode['javaClass'], fields: Partial<FlsNode> = {}): FlsNode {
  return {
    javaClass,
    name: javaClass,
    x: 0,
    y: 0,
    useIpAsName: false,
    useMacAsName: false,
    interfaces: [],
    portCount: 0,
    system: {},
    source: { kind: 'object', className: javaClass, id: undefined, args: [], staticField: undefined,
      factoryMethod: undefined, properties: new Map(), calls: [], presetElements: new Map(), presetEntries: new Map(), fromGetter: false },
    ...fields,
  };
}

function topology(fields: Partial<FlsTopology>): FlsTopology {
  return { versionLine: null, nodes: [], links: [], documentation: [], warnings: [], ...fields };
}

const nic = (ip: string | null, mask: string | null = '255.255.255.0') => ({ ip, mask, mac: undefined, gateway: '', dns: '' });

describe('importProject rules', () => {
  it('labels a gateway wan0, lan0, gw2 and gives a rejected address the default', () => {
    const project = importProject(
      topology({ nodes: [flsNode('Gateway', { interfaces: [nic(null, null), nic('10.0.0.1'), nic('10.1.0.1')] })] }),
      counter(),
    );
    const gateway = project.graph.nodes[0]!;

    expect(gateway.ports.map((port) => port.label)).toEqual(['wan0', 'lan0', 'gw2']);
    expect(gateway.ports.map((port) => project.interfaceConfigurations.get(interfaceKey(gateway.id, port.id)))).toEqual([
      { ipAddress: '42.0.0.10', subnetMask: '255.0.0.0' },
      { ipAddress: '10.0.0.1', subnetMask: '255.255.255.0' },
      { ipAddress: '10.1.0.1', subnetMask: '255.255.255.0' },
    ]);
    expect(project.deviceConfigurations.get(gateway.id)).toEqual({
      ipAddress: '42.0.0.10',
      subnetMask: '255.0.0.0',
      defaultGateway: '',
      dnsServer: '',
    });
  });

  it('keeps an empty name and shows the IP address only on hosts', () => {
    const project = importProject(
      topology({
        nodes: [
          flsNode('Vermittlungsrechner', { name: '', useIpAsName: true }),
          flsNode('Notebook', { useIpAsName: true, useMacAsName: true }),
        ],
      }),
      counter(),
    );

    expect(project.graph.nodes.map((node) => [node.displayName, node.hostLabelPolicy])).toEqual([
      ['', 'manual'],
      ['Notebook', 'ipAndMAC'],
    ]);
  });

  it("takes a switch's and a router's port count from Java, and gives a rejected router address the default", () => {
    const project = importProject(
      topology({
        nodes: [flsNode('Switch', { portCount: 3 }), flsNode('Vermittlungsrechner', { interfaces: [nic('10.0.0.1'), nic(null)] })],
      }),
      counter(),
    );
    const [networkSwitch, router] = project.graph.nodes;

    expect(networkSwitch!.ports.map((port) => port.label)).toEqual(['sw1', 'sw2', 'sw3']);
    expect(router!.ports.map((port) => project.interfaceConfigurations.get(interfaceKey(router!.id, port.id)))).toEqual([
      { ipAddress: '10.0.0.1', subnetMask: '255.255.255.0' },
      { ipAddress: '192.168.0.10', subnetMask: '255.255.255.0' },
    ]);
  });

  it('reads bold from the font style and alpha from the color', () => {
    const project = importProject(
      topology({
        documentation: [
          { type: 2, text: 'b', x: 0, y: 0, width: 50, height: 30, color: [0, 0, 0, 51], font: { name: 'Dialog', size: 18, style: 1 } },
        ],
      }),
      counter(),
    );

    expect(project.documentationItems[0]).toMatchObject({ isBold: true, fontSize: 18, color: { alpha: 0.2 } });
  });

  it("maps a router's firewall, RIP and routes, and says what it cannot map", () => {
    const project = importProject(
      topology({
        nodes: [
          flsNode('Vermittlungsrechner', {
            interfaces: [nic('10.0.0.1')],
            system: {
              ripEnabled: true,
              manualRoutes: [
                ['10.1.0.0', '255.255.0.0', '10.0.0.2', '10.0.0.1'],
                ['10.2.0.0', '255.255.0.0', null, '10.0.0.1'],
              ],
              firewall: {
                activated: true,
                defaultPolicy: 1,
                dropICMP: true,
                filterSYNSegmentsOnly: false,
                filterUdp: false,
                rules: [
                  { srcIP: '10.0.0.0', srcMask: '255.0.0.0', destIP: null, destMask: '', port: 80, protocol: -1, action: 1 },
                  { srcIP: '', srcMask: '', destIP: '', destMask: '', port: -1, protocol: 99, action: 0 },
                ],
              },
            },
          }),
        ],
      }),
      counter(),
    );
    const router = project.graph.nodes[0]!.id;

    expect(project.ripEnabledByNodeId.get(router)).toBe(true);
    expect(project.manualRoutesByNodeId.get(router)).toEqual([
      { destinationNetwork: '10.1.0.0', subnetMask: '255.255.0.0', gateway: '10.0.0.2', interfaceIPAddress: '10.0.0.1' },
    ]);
    expect(project.firewallConfigurationsByNodeId.get(router)).toEqual({
      isActive: true,
      defaultPolicy: 'accept',
      dropIcmp: true,
      filterSynSegmentsOnly: false,
      filterUdp: false,
      rules: [
        {
          sourceIPAddress: '10.0.0.0',
          sourceSubnetMask: '255.0.0.0',
          destinationIPAddress: '',
          destinationSubnetMask: '',
          port: 80,
          protocol: 'all',
          action: 'accept',
        },
        {
          sourceIPAddress: '',
          sourceSubnetMask: '',
          destinationIPAddress: '',
          destinationSubnetMask: '',
          port: -1,
          protocol: 'tcp',
          action: 'drop',
        },
      ],
    });
    expect(project.warnings).toEqual([
      "node 'Vermittlungsrechner': a manual route without four entries, left out",
      "node 'Vermittlungsrechner': firewall protocol 99 unknown, used TCP",
    ]);
  });

  it("gives a switch without SSID one from its id, and joins a host to a wireless network only with an SSID", () => {
    const project = importProject(
      topology({
        nodes: [
          flsNode('Switch', { portCount: 24, system: { ssid: undefined, retentionTime: 2000 } }),
          flsNode('Switch', { portCount: 24, system: { ssid: ' MyWiFi ', retentionTime: 300_000 } }),
          flsNode('Notebook', { interfaces: [nic('10.0.0.1')], system: { ssid: 'MyWiFi', manualRoutes: [] } }),
          flsNode('Rechner', { interfaces: [nic('10.0.0.2')], system: { ssid: '  ', manualRoutes: [] } }),
        ],
      }),
      counter(),
    );
    const [first, second, notebook, pc] = project.graph.nodes.map((node) => node.id);

    expect(project.switchConfigurations.get(first!)).toEqual({ ssid: defaultSwitchConfiguration(first!).ssid, retentionTimeMilliseconds: 2000 });
    expect(project.switchConfigurations.get(second!)).toEqual({ ssid: 'MyWiFi', retentionTimeMilliseconds: 300_000 });
    expect(project.hostWirelessConfigurations.get(notebook!)).toEqual({ isEnabled: true, ssid: 'MyWiFi' });
    expect(project.hostWirelessConfigurations.has(pc!)).toBe(false);
  });

  it('takes DHCP settings for hosts and home routers, trimmed, and only when they are not the defaults', () => {
    const defaults = { isActive: false, lowerBound: '0.0.0.0', upperBound: '0.0.0.0', gateway: '0.0.0.0', dnsServer: '0.0.0.0', useOwnSettings: false, staticAssignedAddresses: [] };
    const project = importProject(
      topology({
        nodes: [
          flsNode('Rechner', {
            interfaces: [nic('10.0.0.1')],
            system: {
              dhcpClient: false,
              dhcpServer: {
                ...defaults,
                isActive: true,
                lowerBound: ' 10.0.0.100 ',
                upperBound: '10.0.0.150',
                staticAssignedAddresses: [{ mac: '0A:00:00:00:00:01', ip: '10.0.0.101' }],
              },
            },
          }),
          flsNode('Notebook', { interfaces: [nic('10.0.0.2')], system: { dhcpClient: true, dhcpServer: defaults } }),
          flsNode('Vermittlungsrechner', {
            interfaces: [nic('10.0.0.3')],
            system: { dhcpClient: true, dhcpServer: { ...defaults, isActive: true } },
          }),
        ],
      }),
      counter(),
    );
    const [pc, notebook, router] = project.graph.nodes.map((node) => node.id);

    expect(project.dhcpServerConfigurations.get(pc!)).toMatchObject({
      isActive: true,
      lowerBoundIPAddress: '10.0.0.100',
      upperBoundIPAddress: '10.0.0.150',
      staticAssignments: [{ macAddress: '0A:00:00:00:00:01', ipAddress: '10.0.0.101' }],
    });
    expect([...project.dhcpServerConfigurations.keys()]).toEqual([pc]);
    expect([...project.dhcpClientConfigurations]).toEqual([[notebook, { isEnabled: true }]]);
    expect(project.warnings).toEqual([
      "node 'Vermittlungsrechner': DHCP client on a router, ignored",
      "node 'Vermittlungsrechner': DHCP server settings on a router, ignored",
    ]);
    expect(router).toBeDefined();
  });

  it('takes port forwarding rows of a home router and pairs modems by port', () => {
    const project = importProject(
      topology({
        nodes: [
          flsNode('Gateway', {
            interfaces: [nic('42.0.0.10'), nic('192.168.0.1')],
            system: { staticNAT: [[' TCP', '80', '192.168.0.10', '8080 '], ['UDP', null, '192.168.0.11', '53']] },
          }),
          flsNode('Modem', { portCount: 1, system: { modem: { mode: 1, port: 4242, ipAddress: 'localhost' } } }),
          flsNode('Modem', { portCount: 1, system: { modem: { mode: 7, port: 70_000, ipAddress: 'localhost' } } }),
        ],
      }),
      counter(),
    );
    const [gateway, server, broken] = project.graph.nodes.map((node) => node.id);

    expect(project.portForwardingRowsByNodeId.get(gateway!)).toEqual([
      { protocolValue: 'TCP', publicPortValue: '80', lanIPAddress: '192.168.0.10', lanPortValue: '8080' },
    ]);
    expect(project.remoteLinkConfigurations.get(server!)).toEqual({ pairIdentifier: 'java-modem-port-4242', latencyMilliseconds: 20, isEnabled: true });
    expect(project.remoteLinkConfigurations.get(broken!)?.pairIdentifier).toBe('java-modem-port-12345');
    expect(project.warnings).toEqual([
      "node 'Gateway': a port forwarding row without four entries, left out",
      "node 'Modem': modem port 70000 is invalid, used 12345",
      "node 'Modem': modem mode 7 unknown, treated as client",
    ]);
  });

  it("maps a host's files by type and extension, as Swift does, and says what it had to guess", () => {
    const file = (name: string | null, type: string | null, content: string | null): FlsFileTree => ({
      kind: 'file',
      name,
      type,
      content,
      children: [],
    });
    const directory = (name: string | null, children: FlsFileTree[]): FlsFileTree => ({ kind: 'directory', name, children });
    const project = importProject(
      topology({
        nodes: [
          flsNode('Rechner', {
            interfaces: [nic('10.0.0.1')],
            system: {
              fileSystem: directory('root', [
                directory(' docs ', [
                  file('a.txt', 'text/txt', 'hallo'),
                  file('pic.JPG', 'txt', 'AAEC'),
                  file('bad.png', 'png', 'not base64!'),
                  file('blob.bin', 'Bin', 'AAEC'),
                  file('odd.xyz', 'xyz', 'plain words'),
                  file('empty.dat', 'dat', '!!!'),
                  file('icon', 'image', 'AAEC'),
                  file(' ', 'txt', 'x'),
                  file('A.TXT', 'txt', 'collides'),
                ]),
                directory(null, [file('lost.txt', 'txt', 'x')]),
                directory('docs', []),
              ]),
            },
          }),
        ],
      }),
      counter(),
    );
    const files = project.virtualFileSystems.get(project.graph.nodes[0]!.id)!;

    expect(files.allEntries().map(({ path, content }) => [path, content.kind, 'mediaType' in content ? content.mediaType : undefined])).toEqual([
      ['/', 'directory', undefined],
      ['/docs', 'directory', undefined],
      ['/docs/a.txt', 'text', undefined],
      ['/docs/bad.png', 'binary', 'application/png'],
      ['/docs/blob.bin', 'binary', 'application/bin'],
      ['/docs/empty.dat', 'text', undefined],
      ['/docs/icon', 'image', 'image/png'],
      ['/docs/odd.xyz', 'text', undefined],
      ['/docs/pic.JPG', 'image', 'image/txt'],
    ]);
    expect(project.warnings).toEqual([
      "Java file '/docs/bad.png' declared image type 'png' but was not valid Base64; imported as UTF-8 binary data.",
      "Java file '/docs/blob.bin' used unknown type 'bin'; preserved as binary data.",
      "Java file '/docs/odd.xyz' used unknown type 'xyz'; preserved as UTF-8 text.",
      "Java file '/docs/empty.dat' used unknown type 'dat'; preserved as UTF-8 text.",
      "Ignored Java filesystem file with missing or unsafe name on 'Rechner'.",
      "Ignored Java filesystem file '/docs/A.TXT' on 'Rechner': caseInsensitiveSiblingCollision(/docs/a.txt, /docs/A.TXT)",
      "Ignored Java filesystem directory with missing or unsafe name on 'Rechner'.",
      "Ignored Java filesystem directory '/docs' on 'Rechner': itemAlreadyExists(/docs)",
    ]);
  });

  it('leaves out a file over the per-file quota, and rejects an import over the project quota', () => {
    const tooBig = 'A'.repeat(8 * 1024 * 1024 + 1);
    const host = (files: FlsFileTree[]) =>
      flsNode('Rechner', { interfaces: [nic('10.0.0.1')], system: { fileSystem: { kind: 'directory', name: 'root', children: files } } });
    const single = importProject(topology({ nodes: [host([{ kind: 'file', name: 'big.txt', type: 'txt', content: tooBig, children: [] }])] }), counter());

    expect(single.virtualFileSystems.get(single.graph.nodes[0]!.id)!.contains('/big.txt')).toBe(false);
    expect(single.warnings).toEqual([
      "Ignored Java filesystem file '/big.txt' on 'Rechner': fileSizeQuotaExceeded(/big.txt, 8388609, 8388608)",
    ]);

    // Three hosts at their 32 MiB limit exceed the 64 MiB project limit:
    // the import fails as a whole (one 8 MiB string, shared).
    const limit = 'A'.repeat(8 * 1024 * 1024);
    const fullHost = () =>
      host([0, 1, 2, 3].map((index): FlsFileTree => ({ kind: 'file', name: `f${index}.txt`, type: 'txt', content: limit, children: [] })));
    expect(() => importProject(topology({ nodes: [fullHost(), fullHost(), fullHost()] }), counter())).toThrow(
      'totalSizeQuotaExceeded(100663296, 67108864)',
    );

    // Three devices at their 32 MiB limit exceed the 64 MiB project limit.
    const full = new Uint8Array(8 * 1024 * 1024);
    const devices = [0, 1, 2].map(() => {
      const fileSystem = new VirtualFileSystem();
      for (let index = 0; index < 4; index++) fileSystem.writeBinaryFile(`/f${index}`, full);
      return fileSystem;
    });
    expect(() => VirtualFileSystem.validateProjectQuotas(devices)).toThrow('totalSizeQuotaExceeded(100663296, 67108864)');
  });

  it('leaves out a cable to itself and one to a port that already has a cable', () => {
    const project = importProject(
      topology({
        nodes: [flsNode('Switch', { portCount: 24 }), flsNode('Rechner', { interfaces: [nic('10.0.0.1')] })],
        links: [
          { ends: [{ node: 0, port: 0 }, { node: 0, port: 1 }], wireless: false },
          { ends: [{ node: 1, port: 0 }, { node: 0, port: 2 }], wireless: false },
          { ends: [{ node: 0, port: 3 }, { node: 1, port: 0 }], wireless: false },
        ],
      }),
      counter(),
    );

    expect(project.graph.links).toHaveLength(1);
    expect(project.warnings).toEqual([
      'cable 1: connects a node to itself, left out',
      'cable 3: a port already has a cable, left out',
    ]);
  });

  it('leaves out documentation items without size or of an unknown type, and colors the one without color', () => {
    const item = { text: 'Hallo', x: 10, y: 20, width: 100, height: 30, font: null };
    const project = importProject(
      topology({
        documentation: [
          { ...item, type: 2, color: null },
          { ...item, type: 1, width: 0, color: [1, 2, 3, 255] },
          { ...item, type: 3, color: [1, 2, 3, 255] },
        ],
      }),
      counter(),
    );

    expect(project.documentationItems.map((doc) => [doc.kind, doc.text, doc.color, doc.fontName, doc.fontSize])).toEqual([
      ['text', 'Hallo', { red: 0, green: 0, blue: 0, alpha: 1 }, 'Dialog', 12],
    ]);
    expect(project.warnings).toEqual([
      'documentation item 1 without a color, given the default',
      'documentation item without size, left out',
      'documentation item of type 3, left out (known: RECT = 1, TEXT = 2)',
    ]);
  });
});