// 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,
// 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 };
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 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,
    })),
    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]!));
    });
  }
});

/** What the corpus does not have: a name set to null, useMACAsName, fewer ports than the constructor makes, more interfaces. */
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,
    },
    { javaClass: 'Switch', name: 'S', x: 100, y: 20, useIpAsName: false, useMacAsName: false, interfaces: [], portCount: 3 },
    {
      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,
    },
    { javaClass: 'Modem', name: 'M', x: 300, y: 20, useIpAsName: false, useMacAsName: false, interfaces: [], portCount: 1 },
  ],
  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 }],
};

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' }],
        },
        { class: 'Switch', name: 'S', position: [100, 20], useIpAsName: undefined, useMacAsName: undefined, ports: [{}, {}, {}] },
        {
          class: 'Vermittlungsrechner',
          name: 'R',
          position: [200, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: ['1', '2', '3'].map(plainInterface),
        },
        { class: 'Modem', name: 'M', position: [300, 20], useIpAsName: undefined, useMacAsName: undefined, ports: [{}] },
      ],
      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 }],
    });
  });
});