// Every corpus file, read and written again: Java FILIUS loads the written
// file (tools/java-oracle, written.java.json) to the same topology as the
// original (corpus.java.json) — devices, names, positions, interfaces,
// system software and files (without applications), cables and
// documentation. Java against Java: no mapping of this package stands
// between the two.
//
// UPDATE_WRITTEN=1 writes the files to test/written/ (not checked in); the
// Java oracle then loads them and records each file's SHA-256, which must
// match what the writer makes now.

import { createHash } from 'node:crypto';
import { mkdirSync, readdirSync, readFileSync, statSync, writeFileSync } from 'node:fs';
import { dirname, join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';
import { decodeJavaBeans, readFlsArchive, readTopology, writeFlsArchive } from '../src/index.js';
import { writeTopologyXml, type TopologyToWrite } from '../src/topologyWriter.js';

const here = dirname(fileURLToPath(import.meta.url));
const corpusRoot = join(here, '../../../corpus');
const writtenRoot = join(here, 'written');

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

type JavaNode = {
  class: string;
  name: string | null;
  bounds: number[];
  useIpAsName: boolean;
  useMacAsName: boolean;
  ports: unknown;
  system: Record<string, unknown>;
};
type JavaFile = { success: boolean; nodes: JavaNode[]; cables: unknown[]; documentation: unknown[]; sha256?: string };

const original = JSON.parse(readFileSync(join(corpusRoot, 'corpus.java.json'), 'utf8')) as Record<string, JavaFile>;
const written = JSON.parse(readFileSync(join(here, 'written.java.json'), 'utf8')) as Record<string, JavaFile>;

/** The system software without its applications, which are a later layer. */
function systemOf(system: Record<string, unknown>) {
  const { applications: _applications, ...settings } = system;
  return settings;
}

/**
 * The topology of Java's view: the label's position, not its size, which
 * Java works out itself.
 */
function topologyOf(view: JavaFile) {
  return {
    success: view.success,
    nodes: view.nodes.map((node) => ({
      class: node.class,
      name: node.name,
      position: node.bounds.slice(0, 2),
      useIpAsName: node.useIpAsName,
      useMacAsName: node.useMacAsName,
      ports: node.ports,
      system: systemOf(node.system),
    })),
    cables: view.cables,
    documentation: view.documentation,
  };
}

describe('the topology written again, as Java loads it', () => {
  for (const file of flsFiles(corpusRoot)) {
    const name = relative(corpusRoot, file);
    it(name, () => {
      const topology = readTopology(decodeJavaBeans(readFlsArchive(new Uint8Array(readFileSync(file))).configurationXml));
      const archive = writeFlsArchive(new TextEncoder().encode(writeTopologyXml(topology)));
      if (process.env.UPDATE_WRITTEN === '1') {
        mkdirSync(dirname(join(writtenRoot, name)), { recursive: true });
        writeFileSync(join(writtenRoot, name), archive);
      }
      const java = written[name];
      expect(java?.sha256, 'written.java.json is not about this output: UPDATE_WRITTEN=1, then npm run oracle:java').toBe(
        createHash('sha256').update(archive).digest('hex'),
      );
      expect(topologyOf(java!)).toEqual(topologyOf(original[name]!));
    });
  }
});

/** Text a file's content may hold: markup, CR and CRLF, a tab, beyond the BMP. */
const FILE_CONTENT = '<p>a & b</p>\r\nline\rend\ttab Grüße 😀\n';

/**
 * What the corpus does not have: a name set to null, useMACAsName, fewer
 * ports than the constructor makes, more interfaces; a PC's SSID, routes and
 * DHCP server with static assignments; a router's firewall switched on, with
 * every flag away from its default and rules of every protocol, one with a
 * null address; a modem's own port and address.
 */
const SYNTHETIC: TopologyToWrite = {
  nodes: [
    {
      javaClass: 'Rechner',
      name: null,
      x: 10,
      y: 20,
      useIpAsName: false,
      useMacAsName: true,
      interfaces: [{ ip: '10.0.0.1', mask: '255.0.0.0', mac: 'AA:BB:CC:DD:EE:01', gateway: null, dns: '10.0.0.53' }],
      portCount: 1,
      system: {
        ssid: 'Lab',
        manualRoutes: [['10.1.0.0', '255.255.0.0', '10.0.0.254', '10.0.0.1']],
        dhcpClient: true,
        dhcpServer: {
          isActive: true,
          lowerBound: '10.0.0.100',
          upperBound: '10.0.0.199',
          gateway: '10.0.0.254',
          dnsServer: '10.0.0.53',
          useOwnSettings: true,
          staticAssignedAddresses: [{ mac: 'AA:BB:CC:DD:EE:77', ip: '10.0.0.77' }],
        },
        fileSystem: {
          kind: 'directory',
          name: '/',
          children: [
            {
              kind: 'directory',
              name: 'docs',
              children: [
                { kind: 'file', name: 'a.txt', type: 'text', content: FILE_CONTENT, children: [] },
                { kind: 'directory', name: null, children: [] },
              ],
            },
            { kind: 'file', name: 'untyped', type: null, content: null, children: [] },
          ],
        },
      },
    },
    {
      javaClass: 'Switch',
      name: 'S',
      x: 100,
      y: 20,
      useIpAsName: false,
      useMacAsName: false,
      interfaces: [],
      portCount: 3,
      system: { ssid: 'S-net', retentionTime: 1234 },
    },
    {
      javaClass: 'Vermittlungsrechner',
      name: 'R',
      x: 200,
      y: 20,
      useIpAsName: false,
      useMacAsName: false,
      interfaces: ['1', '2', '3'].map((octet) => ({
        ip: `10.0.${octet}.1`,
        mask: '255.255.255.0',
        mac: `AA:BB:CC:DD:EE:1${octet}`,
        gateway: '',
        dns: '',
      })),
      portCount: 3,
      system: {
        ripEnabled: true,
        fileSystem: { kind: 'directory', name: 'root', children: [{ kind: 'directory', name: 'www.conf', children: [] }] },
        templateFiles: true,
        firewall: {
          activated: true,
          defaultPolicy: 1,
          dropICMP: true,
          filterSYNSegmentsOnly: false,
          filterUdp: false,
          rules: [
            { srcIP: '10.0.1.0', srcMask: '255.255.255.0', destIP: '', destMask: '', port: -1, protocol: -1, action: 1 },
            { srcIP: '', srcMask: '', destIP: '10.0.2.5', destMask: '255.255.255.255', port: 80, protocol: 6, action: 0 },
            { srcIP: null, srcMask: '', destIP: '', destMask: '', port: 53, protocol: 17, action: 1 },
            { srcIP: '', srcMask: '', destIP: '', destMask: '', port: -1, protocol: 1, action: 0 },
          ],
        },
      },
    },
    {
      javaClass: 'Modem',
      name: 'M',
      x: 300,
      y: 20,
      useIpAsName: false,
      useMacAsName: false,
      interfaces: [],
      portCount: 1,
      system: { modem: { mode: 1, port: 4242, ipAddress: '192.168.1.5' } },
    },
    {
      javaClass: 'Gateway',
      name: 'G',
      x: 400,
      y: 20,
      useIpAsName: false,
      useMacAsName: false,
      interfaces: ['4', '5'].map((octet) => ({
        ip: `10.0.${octet}.1`,
        mask: '255.255.255.0',
        mac: `AA:BB:CC:DD:EE:1${octet}`,
        gateway: '',
        dns: '',
      })),
      portCount: 2,
      system: {
        fileSystem: { kind: 'directory', name: 'own', children: [{ kind: 'file', name: 'x', type: 'text', content: 'y', children: [] }] },
        templateFiles: false,
      },
    },
  ],
  links: [
    { ends: [{ node: 0, port: 0 }, { node: 1, port: 2 }], wireless: false, panel: [0, 1] },
    { ends: [{ node: 2, port: 2 }, { node: 1, port: 0 }], wireless: true, panel: [2, 1] },
  ],
  documentation: [{ type: 1, text: null, x: 5, y: 6, width: 70, height: 80, color: null, font: null }],
};

/** The DHCP server as every IP stack's constructor leaves it. */
const JAVA_DHCP_DEFAULTS = {
  aktiv: false,
  untergrenze: '0.0.0.0',
  obergrenze: '0.0.0.0',
  gatewayip: '0.0.0.0',
  dnsserverip: '0.0.0.0',
  ownSettings: false,
  staticAssignedAddresses: [],
};

/** A file as the oracle describes it: its content as UTF-16 length and SHA-256 of its UTF-8 bytes. */
function javaFile(name: string, type: string | null, content: string | null) {
  return {
    file: name,
    type,
    length: content === null ? null : content.length,
    sha256: content === null ? null : createHash('sha256').update(content, 'utf8').digest('hex'),
    children: [],
  };
}

/** The files a router's constructor makes, as Java loaded them from the corpus. */
function routerTemplate(): unknown[] {
  const router = Object.values(original)
    .flatMap((file) => file.nodes ?? [])
    .find((node) => node.class === 'Vermittlungsrechner');
  return ((router!.system.fileSystem as { children: unknown[] }).children).slice(0, 1);
}

/** A router's firewall as its constructor leaves it. */
const JAVA_ROUTER_FIREWALL = { activated: false, defaultPolicy: 0, dropICMP: false, filterSYNSegmentsOnly: true, filterUdp: true, rules: [] };

describe('a topology beyond the corpus, as Java loads it', () => {
  it('keeps what the corpus never sets', () => {
    const name = 'synthetic/synthetic.fls';
    const archive = writeFlsArchive(new TextEncoder().encode(writeTopologyXml(SYNTHETIC)));
    if (process.env.UPDATE_WRITTEN === '1') {
      mkdirSync(join(writtenRoot, 'synthetic'), { recursive: true });
      writeFileSync(join(writtenRoot, name), archive);
    }
    const java = written[name];
    expect(java?.sha256, 'written.java.json is not about this output: UPDATE_WRITTEN=1, then npm run oracle:java').toBe(
      createHash('sha256').update(archive).digest('hex'),
    );
    const plainInterface = (octet: string) => ({ ip: `10.0.${octet}.1`, mask: '255.255.255.0', mac: `AA:BB:CC:DD:EE:1${octet}`, gateway: '', dns: '' });
    expect(topologyOf(java!)).toEqual({
      success: true,
      nodes: [
        {
          class: 'Rechner',
          name: null,
          position: [10, 20],
          useIpAsName: false,
          useMacAsName: true,
          ports: [{ ip: '10.0.0.1', mask: '255.0.0.0', mac: 'AA:BB:CC:DD:EE:01', gateway: null, dns: '10.0.0.53' }],
          system: {
            ssid: 'Lab',
            manualRoutes: [['10.1.0.0', '255.255.0.0', '10.0.0.254', '10.0.0.1']],
            dhcpClient: true,
            dhcpServer: {
              aktiv: true,
              untergrenze: '10.0.0.100',
              obergrenze: '10.0.0.199',
              gatewayip: '10.0.0.254',
              dnsserverip: '10.0.0.53',
              ownSettings: true,
              staticAssignedAddresses: ['AA:BB:CC:DD:EE:77 10.0.0.77'],
            },
            fileSystem: {
              directory: '/',
              children: [
                { directory: 'docs', children: [javaFile('a.txt', 'text', FILE_CONTENT), { directory: null, children: [] }] },
                javaFile('untyped', null, null),
              ],
            },
          },
        },
        {
          class: 'Switch',
          name: 'S',
          position: [100, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: [{}, {}, {}],
          system: { ssid: 'S-net', retentionTime: 1234 },
        },
        {
          class: 'Vermittlungsrechner',
          name: 'R',
          position: [200, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: ['1', '2', '3'].map(plainInterface),
          system: {
            ripEnabled: true,
            fileSystem: { directory: 'root', children: [...routerTemplate(), { directory: 'www.conf', children: [] }] },
            manualRoutes: [],
            dhcpClient: false,
            dhcpServer: JAVA_DHCP_DEFAULTS,
            firewall: {
              activated: true,
              defaultPolicy: 1,
              dropICMP: true,
              filterSYNSegmentsOnly: false,
              filterUdp: false,
              rules: [
                ['10.0.1.0', '255.255.255.0', '', '', -1, -1, 1],
                ['', '', '10.0.2.5', '255.255.255.255', 80, 6, 0],
                [null, '', '', '', 53, 17, 1],
                ['', '', '', '', -1, 1, 0],
              ],
            },
          },
        },
        {
          class: 'Modem',
          name: 'M',
          position: [300, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: [{}],
          system: { modem: { mode: 1, port: 4242, ipAdresse: '192.168.1.5' } },
        },
        {
          class: 'Gateway',
          name: 'G',
          position: [400, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: ['4', '5'].map(plainInterface),
          system: {
            fileSystem: { directory: 'own', children: [javaFile('x', 'text', 'y')] },
            manualRoutes: [],
            dhcpClient: false,
            dhcpServer: JAVA_DHCP_DEFAULTS,
            staticNAT: [],
            firewall: JAVA_ROUTER_FIREWALL,
          },
        },
      ],
      cables: [
        { ends: [[0, 0], [1, 2]], wireless: false, panel: [0, 1] },
        { ends: [[2, 2], [1, 0]], wireless: true, panel: [2, 1] },
      ],
      documentation: [{ type: 1, text: null, bounds: [5, 6, 70, 80], color: null, font: null }],
    });
  });
});