// Every corpus file, imported into the editor model and exported again:
// Java FILIUS loads the written file (tools/java-oracle, exported.java.json)
// to the topology of the original (corpus.java.json) — up to what the model
// decides differently, named below (DEPARTURES).
//
// UPDATE_EXPORTED=1 writes the files to test/exported/ (not checked in); the
// Java oracle then loads them and records each file's SHA-256, which must
// match what the export 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 { DOCUMENTATION_MINIMUM_SIZE, stableGeneratedMacAddress, type Id, type TopologyNode } from '@mdg-filius/core';
import { describe, expect, it } from 'vitest';
import {
  decodeJavaBeans,
  exportProject,
  importProject,
  readFlsArchive,
  readTopology,
  writeFlsArchive,
  type ProjectToExport,
} from '../src/index.js';
import { writeTopologyXml } from '../src/topologyWriter.js';

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

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] : [];
  });
}

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

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 exportedPath = join(here, 'exported.java.json');
const exported = JSON.parse(readFileSync(exportedPath, 'utf8')) as Record<string, JavaFile>;

/** The topology of Java's view: the label's position, not its size. */
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,
  };
}

/**
 * What the model decides differently from the Java file it was imported
 * from, each applied to Java's view of the original:
 *  - generatedMac: a card whose MAC the file lacked (Java rolls a new one at
 *    each load) has the one the simulation uses, derived from its port id;
 *  - documentation: the items in the model's render order (rectangles below
 *    text), a missing text empty, a missing font Dialog 12, and at least the
 *    editor's smallest size (DOCUMENTATION_MINIMUM_SIZE).
 */
const DEPARTURES = {
  generatedMac(view: JavaFile, macs: (string | undefined)[][]): JavaFile {
    return {
      ...view,
      nodes: view.nodes.map((node, index) => ({
        ...node,
        ports: (node.ports as Record<string, unknown>[]).map((port, portIndex) =>
          'mac' in port && port.mac === null ? { ...port, mac: macs[index]![portIndex] } : port,
        ),
      })),
    };
  },
  documentation(view: JavaFile): JavaFile {
    const items = (view.documentation as Record<string, unknown>[]).map((item) => {
      const [x, y, width, height] = item.bounds as number[];
      return {
        ...item,
        text: item.text ?? '',
        bounds: [x, y, Math.max(width!, DOCUMENTATION_MINIMUM_SIZE.width), Math.max(height!, DOCUMENTATION_MINIMUM_SIZE.height)],
        font: item.font ?? ['Dialog', 12, 0],
      };
    });
    return { ...view, documentation: sortedDocumentation(items) };
  },
};

/** Documentation items in an order that does not depend on the list's. */
function sortedDocumentation(items: unknown[]): unknown[] {
  return items.map((item) => JSON.stringify(item)).sort().map((text) => JSON.parse(text) as unknown);
}

/** Every port id each exported node's MAC could be derived from, by node and port. */
function portIds(project: ReturnType<typeof importProject>): Id[][] {
  return project.graph.nodes.map((node) => node.ports.map((port) => port.id));
}

const departed = { generatedMac: new Set<string>(), documentation: new Set<string>() };

describe('the editor model exported, 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 project = importProject(topology, counter());
      const { topology: toWrite } = exportProject(project);
      const archive = writeFlsArchive(new TextEncoder().encode(writeTopologyXml(toWrite)));
      if (process.env.UPDATE_EXPORTED === '1') {
        mkdirSync(dirname(join(exportedRoot, name)), { recursive: true });
        writeFileSync(join(exportedRoot, name), archive);
      }
      const java = exported[name];
      expect(java?.sha256, 'exported.java.json is not about this output: UPDATE_EXPORTED=1, then npm run oracle:java').toBe(
        createHash('sha256').update(archive).digest('hex'),
      );
      // A MAC the file lacked: the one derived from the port's id.
      const ids = portIds(project);
      const macs = toWrite.nodes.map((node, index) =>
        node.interfaces.map((nic, portIndex) => {
          const derived = stableGeneratedMacAddress(ids[index]![portIndex]!);
          return nic.mac === derived ? derived : undefined;
        }),
      );
      const source = original[name]!;
      const withMacs = DEPARTURES.generatedMac(source, macs);
      const expected = DEPARTURES.documentation(withMacs);
      if (JSON.stringify(withMacs) !== JSON.stringify(source)) departed.generatedMac.add(name);
      if (JSON.stringify(expected.documentation) !== JSON.stringify(source.documentation)) departed.documentation.add(name);
      expect(topologyOf({ ...java!, documentation: sortedDocumentation(java!.documentation) })).toEqual(topologyOf(expected));
    });
  }

  it('departs from Java where the model decides differently', () => {
    expect(departed.generatedMac.size).toBeGreaterThan(0);
    expect(departed.documentation.size).toBeGreaterThan(0);
  });
});

// ── A model beyond the corpus, loaded by Java ──────────────────────────────

const port = (id: string) => ({ id, label: id, isOccupied: false });

/**
 * What the corpus lacks: a label with IP and MAC, a position between
 * pixels, a switch with five ports, a wireless notebook, a router with three
 * interfaces and a gateway, a half-transparent bold text and a rectangle.
 */
const SYNTHETIC: ProjectToExport = {
  graph: {
    nodes: [
      { id: 'pc', kind: 'pc', displayName: 'PC', hostLabelPolicy: 'ipAndMAC', position: { x: 10.6, y: 20.2 }, ports: [port('p0')] },
      { id: 'sw', kind: 'networkSwitch', displayName: 'SW', hostLabelPolicy: 'manual', position: { x: 100, y: 20 }, ports: ['s0', 's1', 's2', 's3', 's4'].map(port) },
      { id: 'nb', kind: 'notebook', displayName: 'NB', hostLabelPolicy: 'macAddress', position: { x: 100, y: 120 }, ports: [port('n0')] },
      { id: 'rt', kind: 'router', displayName: 'RT', hostLabelPolicy: 'manual', position: { x: 200, y: 20 }, ports: ['r0', 'r1', 'r2'].map(port) },
    ],
    links: [
      { id: 'l1', sourceNodeId: 'pc', sourcePortId: 'p0', targetNodeId: 'sw', targetPortId: 's4' },
      { id: 'l2', sourceNodeId: 'nb', sourcePortId: 'n0', targetNodeId: 'sw', targetPortId: 's0' },
      { id: 'l3', sourceNodeId: 'sw', sourcePortId: 's2', targetNodeId: 'rt', targetPortId: 'r1' },
    ],
  },
  deviceConfigurations: new Map([
    ['pc', { ipAddress: '10.0.0.1', subnetMask: '255.255.255.0', defaultGateway: '10.0.0.254', dnsServer: '10.0.0.53' }],
    ['nb', { ipAddress: '10.0.0.2', subnetMask: '255.255.255.0', defaultGateway: '', dnsServer: '' }],
    ['rt', { ipAddress: '10.0.0.254', subnetMask: '255.255.255.0', defaultGateway: '10.9.9.9', dnsServer: '10.0.0.53' }],
  ]),
  interfaceConfigurations: new Map([
    ['rt/r0', { ipAddress: '10.1.0.1', subnetMask: '255.255.0.0' }],
    ['rt/r1', { ipAddress: '10.0.0.254', subnetMask: '255.255.255.0' }],
    ['rt/r2', { ipAddress: '10.2.0.1', subnetMask: '255.255.0.0' }],
  ]),
  hostWirelessConfigurations: new Map([['nb', { isEnabled: true, ssid: 'net' }]]),
  documentationItems: [
    {
      id: 'd1',
      kind: 'rectangle',
      frame: { x: 5, y: 6, width: 300, height: 200 },
      text: '',
      color: { red: 1, green: 0.5, blue: 0, alpha: 0.5 },
      fontName: 'Dialog',
      fontSize: 12,
      isBold: false,
      order: 0,
    },
    {
      id: 'd2',
      kind: 'text',
      frame: { x: 40.4, y: 50.6, width: 120, height: 30 },
      text: 'Netz A\nzweite Zeile',
      color: { red: 0, green: 0, blue: 1, alpha: 1 },
      fontName: 'SansSerif',
      fontSize: 16,
      isBold: true,
      order: 1,
    },
  ],
};

describe('a model beyond the corpus, as Java loads it', () => {
  it('keeps what the corpus never has', () => {
    const name = 'synthetic/model.fls';
    const { topology: toWrite, warnings } = exportProject(SYNTHETIC);
    const archive = writeFlsArchive(new TextEncoder().encode(writeTopologyXml(toWrite)));
    if (process.env.UPDATE_EXPORTED === '1') {
      mkdirSync(join(exportedRoot, 'synthetic'), { recursive: true });
      writeFileSync(join(exportedRoot, name), archive);
    }
    const java = exported[name];
    expect(java?.sha256, 'exported.java.json is not about this output: UPDATE_EXPORTED=1, then npm run oracle:java').toBe(
      createHash('sha256').update(archive).digest('hex'),
    );
    expect(warnings).toEqual([]);
    const card = (ip: string, mask: string, mac: string, gateway: string, dns: string, wireless = false) => ({ ip, mask, mac, gateway, dns, wireless });
    expect(topologyOf(java!)).toEqual({
      success: true,
      nodes: [
        {
          class: 'Rechner',
          name: 'PC',
          position: [11, 20],
          useIpAsName: true,
          useMacAsName: true,
          ports: [card('10.0.0.1', '255.255.255.0', stableGeneratedMacAddress('p0'), '10.0.0.254', '10.0.0.53')],
        },
        { class: 'Switch', name: 'SW', position: [100, 20], useIpAsName: undefined, useMacAsName: undefined, ports: [{}, {}, {}, {}, {}] },
        {
          class: 'Notebook',
          name: 'NB',
          position: [100, 120],
          useIpAsName: false,
          useMacAsName: true,
          ports: [card('10.0.0.2', '255.255.255.0', stableGeneratedMacAddress('n0'), '', '', true)],
        },
        {
          class: 'Vermittlungsrechner',
          name: 'RT',
          position: [200, 20],
          useIpAsName: undefined,
          useMacAsName: undefined,
          ports: [
            card('10.1.0.1', '255.255.0.0', stableGeneratedMacAddress('r0'), '10.9.9.9', '10.0.0.53'),
            card('10.0.0.254', '255.255.255.0', stableGeneratedMacAddress('r1'), '10.9.9.9', '10.0.0.53'),
            card('10.2.0.1', '255.255.0.0', stableGeneratedMacAddress('r2'), '10.9.9.9', '10.0.0.53'),
          ],
        },
      ],
      cables: [
        { ends: [[0, 0], [1, 4]], wireless: false, panel: [0, 1] },
        { ends: [[2, 0], [1, 0]], wireless: true, panel: [2, 1] },
        { ends: [[1, 2], [3, 1]], wireless: false, panel: [1, 3] },
      ],
      documentation: [
        { type: 1, text: '', bounds: [5, 6, 300, 200], color: [255, 128, 0, 128], font: ['Dialog', 12, 0] },
        { type: 2, text: 'Netz A\nzweite Zeile', bounds: [40, 51, 120, 30], color: [0, 0, 255, 255], font: ['SansSerif', 16, 1] },
      ],
    });
  });
});

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

describe('exportProject rules', () => {
  const node = (id: string, kind: TopologyNode['kind'], ports: string[], extra: Partial<TopologyNode> = {}): TopologyNode => ({
    id,
    kind,
    displayName: id,
    hostLabelPolicy: 'manual',
    position: { x: 0, y: 0 },
    ports: ports.map(port),
    ...extra,
  });
  const link = (id: string, source: [string, string], target: [string, string]) => ({
    id,
    sourceNodeId: source[0],
    sourcePortId: source[1],
    targetNodeId: target[0],
    targetPortId: target[1],
  });
  const project = (nodes: TopologyNode[], links: ReturnType<typeof link>[], wireless: [string, boolean][] = []): ProjectToExport => ({
    graph: { nodes, links },
    deviceConfigurations: new Map(),
    interfaceConfigurations: new Map(),
    hostWirelessConfigurations: new Map(wireless.map(([id, isEnabled]) => [id, { isEnabled, ssid: 'net' }])),
    documentationItems: [],
  });

  it('leaves out a node of a kind Java does not have, and the links to it', () => {
    const { topology, warnings } = exportProject(
      project(
        [node('pc', 'pc', ['p0']), node('odd', 'unsupported', ['o0']), node('sw', 'networkSwitch', ['s0', 's1'])],
        [link('l1', ['pc', 'p0'], ['odd', 'o0']), link('l2', ['pc', 'p0'], ['sw', 's1']), link('l3', ['pc', 'missing'], ['sw', 's0'])],
      ),
    );
    expect(topology.nodes.map((each) => each.javaClass)).toEqual(['Rechner', 'Switch']);
    expect(topology.links).toEqual([{ ends: [{ node: 0, port: 0 }, { node: 1, port: 1 }], wireless: false, panel: [0, 1] }]);
    expect(warnings).toEqual([
      "node 'odd': a kind Java FILIUS does not have, left out",
      'link 1: an end is not a port of an exported node, left out',
      'link 3: an end is not a port of an exported node, left out',
    ]);
  });

  it('joins wirelessly only a host with a wireless card and a switch', () => {
    const { topology } = exportProject(
      project(
        [
          node('nb', 'notebook', ['n0']),
          node('sw', 'networkSwitch', ['s0', 's1']),
          node('nb2', 'notebook', ['m0']),
          node('rt', 'router', ['r0']),
          node('pc', 'pc', ['p0']),
        ],
        [link('l1', ['sw', 's0'], ['nb', 'n0']), link('l2', ['nb2', 'm0'], ['rt', 'r0']), link('l3', ['pc', 'p0'], ['sw', 's1'])],
        [
          ['nb', true],
          ['nb2', true],
          ['pc', false],
        ],
      ),
    );
    expect(topology.links.map((each) => each.wireless)).toEqual([true, false, false]);
    expect(topology.nodes.map((each) => each.interfaces.map((nic) => nic.wireless))).toEqual([[true], [], [true], [false], [false]]);
  });

  it('rounds positions to Java ints and shows IP and MAC as the policy says', () => {
    const { topology } = exportProject(
      project([node('pc', 'pc', ['p0'], { position: { x: 10.5, y: -3.4 }, hostLabelPolicy: 'ipAndMAC' })], []),
    );
    expect(topology.nodes[0]).toMatchObject({ x: 11, y: -3, useIpAsName: true, useMacAsName: true, portCount: 1 });
    expect(topology.nodes[0]!.interfaces[0]!.mac).toBe(stableGeneratedMacAddress('p0'));
  });
});