// The design tools' changes to the document: new devices as Java's palette
// makes them (tools/java-oracle's NewDeviceRun saved them in
// fixtures/new-devices.fls), moving and removing, cables by Java's rules,
// and each person's undo taking back their own changes only.

import { readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';
import * as Y from 'yjs';
import { interfaceKey, NetworkRuntimeEngine, type Id } from '@mdg-filius/core';
import { openProjectArchive, projectSnapshot, type ImportedProject } from '@mdg-filius/fls';
import { addDevice, connect, createUndoManager, docSnapshot, moveDevice, newDeviceProject, PALETTE, readProject, removeDevice, removeLink, removeLinksOf, repair, ROOTS, topologyView, type NewDevice } from '../src/index.js';

const fixture = join(dirname(fileURLToPath(import.meta.url)), 'fixtures/new-devices.fls');

/** Everything the project holds for one device, as plain values; Java's random MAC addresses and SSID left out. */
function entriesOf(project: ImportedProject, id: Id) {
  const node = project.graph.nodes.find((each) => each.id === id)!;
  const fields = [
    'deviceConfigurations',
    'hostWirelessConfigurations',
    'manualRoutesByNodeId',
    'ripEnabledByNodeId',
    'ipForwardingByNodeId',
    'firewallConfigurationsByNodeId',
    'dhcpClientConfigurations',
    'dhcpServerConfigurations',
    'portForwardingRowsByNodeId',
    'remoteLinkConfigurations',
    'webServerConfigurations',
    'gnutellaConfigurations',
    'dnsServerConfigurations',
    'emailClientConfigurations',
    'emailServerConfigurations',
    'echoServerConfigurations',
    'simpleClientConfigurations',
    'installedPrograms',
    'activePrograms',
    'ownApplicationsByNodeId',
  ] as const;
  const switchConfiguration = project.switchConfigurations.get(id);
  return {
    kind: node.kind,
    name: node.displayName,
    labelPolicy: node.hostLabelPolicy,
    position: node.position,
    ports: node.ports.map((port) => [port.label, port.isOccupied]),
    interfaces: node.ports.map((port) => project.interfaceConfigurations.get(interfaceKey(id, port.id))),
    switch: switchConfiguration === undefined ? undefined : { ...switchConfiguration, ssid: 'rolled' },
    files: project.virtualFileSystems.get(id)?.allEntries(),
    ...Object.fromEntries(fields.map((field) => [field, (project[field] as ReadonlyMap<Id, unknown>).get(id)])),
  };
}

function javaDevices(): ImportedProject {
  let counter = 0;
  return openProjectArchive(new Uint8Array(readFileSync(fixture)), () => `00000000-0000-0000-0000-${(++counter).toString(16).padStart(12, '0')}`);
}

let ids = 0;
const newId = () => `10000000-0000-0000-0000-${(++ids).toString(16).padStart(12, '0')}`;

function device(kind: NewDevice['kind'], fields: Partial<NewDevice> = {}): NewDevice {
  return { kind, id: newId(), name: kind, x: 100, y: 100, newId, ...fields };
}

describe('a new device', () => {
  it("is what Java's palette makes, of every kind and every router size", () => {
    const java = javaDevices();
    expect(java.graph.nodes.map((node) => node.kind)).toEqual(['pc', 'notebook', 'networkSwitch', ...Array(7).fill('router'), 'gateway', 'remoteLink']);
    for (const node of java.graph.nodes) {
      const ours = newDeviceProject({ kind: node.kind as NewDevice['kind'], id: node.id, name: node.displayName, x: node.position.x, y: node.position.y, interfaces: node.ports.length, newId });
      expect(entriesOf(ours, node.id), `${node.kind} ${node.ports.length}`).toEqual(entriesOf(java, node.id));
    }
  });

  it("comes from a palette in Java's order", () => {
    expect(PALETTE).toEqual(['pc', 'notebook', 'networkSwitch', 'gateway', 'router', 'remoteLink']);
  });

  it('keeps a router between 2 and 8 interfaces, 2 when not asked', () => {
    const count = (interfaces?: number) => newDeviceProject(device('router', interfaces === undefined ? {} : { interfaces })).graph.nodes[0]!.ports.length;
    expect([count(), count(1), count(5), count(12)]).toEqual([2, 2, 5, 8]);
  });

  it('comes after all others in the document, at whole pixels', () => {
    const doc = new Y.Doc();
    const first = device('pc', { x: 10.4, y: 20.6 });
    // An id below the first one's: the order is the place, not the id.
    const second = device('networkSwitch', { id: '00000000-0000-0000-0000-000000000001' });
    addDevice(doc, first, 'me');
    addDevice(doc, second, 'me');
    const project = readProject(doc);
    expect(project.graph.nodes.map((node) => node.id)).toEqual([first.id, second.id]);
    expect(project.graph.nodes[0]!.position).toEqual({ x: 10, y: 21 });
    expect(project.deviceConfigurations.get(first.id)).toEqual({ ipAddress: '192.168.0.10', subnetMask: '255.255.255.0', defaultGateway: '', dnsServer: '' });
    moveDevice(doc, first.id, 33.5, 44.49, 'me');
    expect(readProject(doc).graph.nodes[0]!.position).toEqual({ x: 34, y: 44 });
  });
});

/** A small network built with the tools: two PCs, a switch, a router, a home router, a wireless notebook. */
function network() {
  const doc = new Y.Doc();
  const [pcA, pcB, hub, router, home, notebook] = [device('pc'), device('pc'), device('networkSwitch'), device('router', { interfaces: 2 }), device('gateway'), device('notebook')];
  for (const each of [pcA, pcB, hub, router, home, notebook]) addDevice(doc, each, 'me');
  return { doc, pcA, pcB, hub, router, home, notebook, port: (node: NewDevice, index: number) => readProject(doc).graph.nodes.find((each) => each.id === node.id)!.ports[index]!.id };
}

describe('a cable', () => {
  it("takes each device's first free port", () => {
    const { doc, pcA, pcB, hub, port } = network();
    expect(connect(doc, { node: pcA.id }, { node: hub.id }, 'link-1', 'me')).toEqual({ link: 'link-1' });
    expect(connect(doc, { node: pcB.id }, { node: hub.id }, 'link-2', 'me')).toEqual({ link: 'link-2' });
    expect(readProject(doc).graph.links.map((link) => [link.sourcePortId, link.targetPortId])).toEqual([
      [port(pcA, 0), port(hub, 0)],
      [port(pcB, 0), port(hub, 1)],
    ]);
  });

  it("refuses as Java does: no free port, the same two devices again, a device with itself", () => {
    const { doc, pcA, hub, router } = network();
    connect(doc, { node: pcA.id }, { node: hub.id }, 'link-1', 'me');
    expect(connect(doc, { node: pcA.id }, { node: router.id }, 'link-2', 'me')).toEqual({ error: 'noFreePort' });
    expect(connect(doc, { node: hub.id }, { node: pcA.id }, 'link-3', 'me')).toEqual({ error: 'noFreePort' });
    expect(connect(doc, { node: router.id }, { node: hub.id }, 'link-4', 'me')).toEqual({ link: 'link-4' });
    expect(connect(doc, { node: hub.id }, { node: router.id }, 'link-5', 'me')).toEqual({ error: 'alreadyConnected' });
    expect(connect(doc, { node: hub.id }, { node: hub.id }, 'link-6', 'me')).toEqual({ error: 'sameDevice' });
    expect(connect(doc, { node: hub.id }, { node: 'nobody' }, 'link-7', 'me')).toEqual({ error: 'unknownDevice' });
    expect(readProject(doc).graph.links.map((link) => link.id)).toEqual(['link-1', 'link-4']);
  });

  it("joins a home router at its WAN port, or at its LAN port when asked, each refused when taken", () => {
    const { doc, pcA, pcB, hub, router, home, port } = network();
    expect(connect(doc, { node: router.id }, { node: home.id }, 'wan', 'me')).toEqual({ link: 'wan' });
    expect(connect(doc, { node: pcA.id }, { node: home.id }, 'again', 'me')).toEqual({ error: 'wanOccupied' });
    expect(connect(doc, { node: hub.id }, { node: home.id, port: port(home, 1) }, 'lan', 'me')).toEqual({ link: 'lan' });
    expect(connect(doc, { node: pcB.id }, { node: home.id, port: port(home, 1) }, 'again', 'me')).toEqual({ error: 'lanOccupied' });
    expect(readProject(doc).graph.links.map((link) => link.targetPortId)).toEqual([port(home, 0), port(home, 1)]);
  });

  it('takes a port that was asked for, if it is free', () => {
    const { doc, pcA, pcB, hub, port } = network();
    expect(connect(doc, { node: pcA.id }, { node: hub.id, port: port(hub, 5) }, 'link-1', 'me')).toEqual({ link: 'link-1' });
    expect(connect(doc, { node: pcB.id }, { node: hub.id, port: port(hub, 5) }, 'link-2', 'me')).toEqual({ error: 'portTaken' });
    expect(connect(doc, { node: pcB.id }, { node: hub.id, port: 'no-port' }, 'link-2', 'me')).toEqual({ error: 'unknownPort' });
  });

  it('joins a wireless host only to a switch, and draws it as wireless', () => {
    const { doc, notebook, hub, router } = network();
    const settings = doc.getMap<Y.Map<unknown>>(ROOTS.nodes).get(notebook.id)!.get('settings') as Y.Map<unknown>;
    const wireless = new Y.Map<unknown>();
    wireless.set('isEnabled', true);
    wireless.set('ssid', 'schule');
    settings.set('wireless', wireless);
    expect(connect(doc, { node: notebook.id }, { node: router.id }, 'link-1', 'me')).toEqual({ error: 'wirelessNotPossible' });
    expect(connect(doc, { node: router.id }, { node: notebook.id }, 'link-1', 'me')).toEqual({ error: 'wirelessNotPossible' });
    expect(connect(doc, { node: notebook.id }, { node: hub.id }, 'link-1', 'me')).toEqual({ link: 'link-1' });
    expect(topologyView(doc).links[0]!.wireless).toBe(true);
  });

  it('is pulled with all of a device\'s cables, the device staying', () => {
    const { doc, pcA, pcB, hub, router, home } = network();
    connect(doc, { node: pcA.id }, { node: hub.id }, 'link-1', 'me');
    connect(doc, { node: pcB.id }, { node: hub.id }, 'link-2', 'me');
    expect(connect(doc, { node: router.id }, { node: home.id }, 'link-3', 'me')).toEqual({ link: 'link-3' });
    removeLinksOf(doc, hub.id, 'me');
    expect(readProject(doc).graph.links.map((link) => link.id)).toEqual(['link-3']);
    expect(readProject(doc).graph.nodes.some((node) => node.id === hub.id)).toBe(true);
  });

  it('is pulled alone, and with the device it is plugged into', () => {
    const { doc, pcA, pcB, hub } = network();
    connect(doc, { node: pcA.id }, { node: hub.id }, 'link-1', 'me');
    connect(doc, { node: pcB.id }, { node: hub.id }, 'link-2', 'me');
    removeLink(doc, 'link-1', 'me');
    expect(readProject(doc).graph.links.map((link) => link.id)).toEqual(['link-2']);
    removeDevice(doc, hub.id, 'me');
    const project = readProject(doc);
    expect(project.graph.links).toEqual([]);
    expect(project.graph.nodes.some((node) => node.id === hub.id)).toBe(false);
  });
});

describe('a network built with the tools', () => {
  it('runs in the core: two PCs across a switch ping each other', () => {
    const { doc, pcA, pcB, hub } = network();
    connect(doc, { node: pcA.id }, { node: hub.id }, 'link-1', 'me');
    connect(doc, { node: pcB.id }, { node: hub.id }, 'link-2', 'me');
    const address = (node: NewDevice, ip: string) => (doc.getMap<Y.Map<unknown>>(ROOTS.nodes).get(node.id)!.get('settings') as Y.Map<Y.Map<unknown>>).get('device')!.set('ipAddress', ip);
    address(pcA, '192.168.0.1');
    address(pcB, '192.168.0.2');
    expect(docSnapshot(doc)).toEqual(projectSnapshot(readProject(doc)));
    const engine = new NetworkRuntimeEngine(1);
    engine.handle({ type: 'start', snapshot: docSnapshot(doc), seed: 1, initialTimeMilliseconds: 0 });
    expect(engine.sendIcmpEcho(pcA.id, '192.168.0.2').type).toBe('delivered');
  });
});

describe("a person's undo", () => {
  it('takes back their own changes only, and brings them back', () => {
    const mine = new Y.Doc();
    const theirs = new Y.Doc();
    const exchange = () => {
      Y.applyUpdate(theirs, Y.encodeStateAsUpdate(mine, Y.encodeStateVector(theirs)));
      Y.applyUpdate(mine, Y.encodeStateAsUpdate(theirs, Y.encodeStateVector(mine)));
    };
    const undo = createUndoManager(mine, 'me');
    const [pc, hub, other] = [device('pc'), device('networkSwitch'), device('notebook')];
    addDevice(mine, pc, 'me');
    undo.stopCapturing();
    addDevice(mine, hub, 'me');
    undo.stopCapturing();
    exchange();
    addDevice(theirs, other, 'them');
    connect(theirs, { node: other.id }, { node: hub.id }, 'their-link', 'them');
    exchange();

    // My last change was the switch: undoing it takes it away. Their cable to it is left without an end,
    // which the janitor removes (I1) — on F, not in a client.
    undo.undo();
    exchange();
    const ids = (doc: Y.Doc) => readProject(doc).graph.nodes.map((node) => node.id);
    expect(ids(mine)).toEqual([pc.id, other.id]);
    expect(ids(theirs)).toEqual([pc.id, other.id]);
    expect(repair(theirs).danglingLinks).toEqual(['their-link']);
    exchange();
    undo.undo();
    expect(ids(mine)).toEqual([other.id]);
    // Nothing more of mine: their notebook stays.
    expect(undo.undo()).toBeNull();
    expect(ids(mine)).toEqual([other.id]);
    undo.redo();
    undo.redo();
    expect(new Set(ids(mine))).toEqual(new Set([pc.id, hub.id, other.id]));
  });

  it('takes back a removed device with its cables, and a drag as one step', () => {
    const doc = new Y.Doc();
    const [pc, hub] = [device('pc'), device('networkSwitch')];
    addDevice(doc, pc, 'me');
    addDevice(doc, hub, 'me');
    connect(doc, { node: pc.id }, { node: hub.id }, 'link-1', 'me');
    const undo = createUndoManager(doc, 'me');
    // A drag: many moves within a moment.
    for (let step = 1; step <= 10; step += 1) moveDevice(doc, pc.id, 100 + step * 10, 100, 'me');
    undo.stopCapturing();
    removeDevice(doc, pc.id, 'me');
    undo.undo();
    const project = readProject(doc);
    expect(project.graph.links.map((link) => link.id)).toEqual(['link-1']);
    expect(project.graph.nodes.find((node) => node.id === pc.id)!.position).toEqual({ x: 200, y: 100 });
    undo.undo();
    expect(readProject(doc).graph.nodes.find((node) => node.id === pc.id)!.position).toEqual({ x: 100, y: 100 });
  });
});