// The Gnutella window in the room, on three computers of one network: its
// view (the known peers, the results as the table shows them, the files of
// /peer2peer, the number of peers), its actions, a downloaded file in the
// document, and what a run leaves in the project. The program's steps
// against Java's window are packages/core/test/gnutellaWindow.test.ts.

import { describe, expect, it } from 'vitest';
import * as Y from 'yjs';
import { addDevice, changeFiles, connect, emptyProject, fileText, readProject, setHostAddress, setSoftware, writeProject } from '@mdg-filius/doc';
import type { GnutellaView, HostMessage } from '@mdg-filius/protocol';
import { SimulationRoom, TICK_MILLISECONDS } from '../src/index.js';

function setUp() {
  const doc = new Y.Doc();
  writeProject(doc, emptyProject());
  let counter = 0;
  const newId = () => `port-${++counter}`;
  addDevice(doc, { kind: 'networkSwitch', id: 'switch', name: 'Switch', x: 100, y: 100, newId }, 'me');
  for (const [id, address] of [
    ['a', '192.168.0.20'],
    ['b', '192.168.0.30'],
    ['c', '192.168.0.31'],
  ] as const) {
    addDevice(doc, { kind: 'pc', id, name: id, x: 0, y: 0, newId }, 'me');
    connect(doc, { node: id }, { node: 'switch' }, `cable-${id}`, 'me');
    setHostAddress(doc, id, 'ipAddress', address, 'me');
    setSoftware(doc, id, { install: ['gnutella'], remove: [] }, 'de', 'me');
  }
  changeFiles(doc, 'c', 'me', (files) => files.writeTextFile('/peer2peer/notizen.txt', 'Notiz'));
  let now = 0;
  const room = new SimulationRoom(doc, { now: () => now, seed: () => 3 });
  const views = new Map<string, GnutellaView | null>();
  const errors: string[] = [];
  const lines: unknown[] = [];
  const client = room.connect((message: HostMessage) => {
    if (message.kind === 'view' && message.app === 'gnutella') views.set(message.node, message.view as GnutellaView | null);
    if (message.kind === 'app' && message.app === 'gnutella') lines.push(...message.lines);
    if (message.kind === 'error') errors.push(message.code);
  });
  const send = (fields: object) => room.receive(client, { v: 1, ...fields });
  send({ kind: 'sub', topics: ['app:a/gnutella', 'app:b/gnutella', 'app:switch/gnutella'] });
  send({ kind: 'start' });
  const run = (milliseconds: number) => {
    for (let elapsed = 0; elapsed < milliseconds; elapsed += TICK_MILLISECONDS) {
      now += TICK_MILLISECONDS;
      room.tick();
    }
  };
  run(TICK_MILLISECONDS);
  const act = (node: string, action: string, args: object = {}) => send({ kind: 'input', node, app: 'gnutella', action, args, reqId: action });
  return { doc, views, errors, lines, act, run, send };
}

describe('the Gnutella window in the room', () => {
  it('shows the peers, the results and the files, and takes its actions', () => {
    const { doc, views, errors, lines, act, run } = setUp();
    const view = () => views.get('a')!;
    expect(view()).toEqual({ peers: [], results: [], files: [], maximumKnownPeers: 3 });
    act('b', 'join', { address: '192.168.0.31' });
    run(3000);
    act('a', 'join', { address: '192.168.0.30' });
    run(3000);
    // The ping goes on to .31, whose pong makes it a peer too.
    expect(view().peers).toEqual(['192.168.0.30', '192.168.0.31']);
    act('a', 'search', { criteria: 'notiz' });
    run(3000);
    expect(view().results).toEqual([['192.168.0.31', 'notizen.txt', ' 5 B']]);
    act('a', 'download', { row: 0 });
    run(3000);
    expect(view().files).toEqual([['notizen.txt', 'txt']]);
    // In the document's file at once.
    expect(fileText(doc, 'a', '/peer2peer/notizen.txt')?.toString()).toBe('Notiz');
    act('a', 'clearResults');
    expect(view().results).toEqual([]);
    // "Stopp!" at once: the hits on their way are lost.
    act('a', 'search', { criteria: 'notiz' });
    act('a', 'cancelSearch');
    run(3000);
    expect(view().results).toEqual([]);
    act('a', 'setMaximumPeers', { count: 12 });
    expect(view().maximumKnownPeers).toBe(12);
    act('a', 'leave');
    expect(view().peers).toEqual([]);
    expect(errors).toEqual([]);
    // The window has no lines: none are sent.
    expect(lines).toEqual([]);
  });

  it('leaves in the project what the run made of the number of peers', () => {
    const { doc, act, send } = setUp();
    act('a', 'setMaximumPeers', { count: 7 });
    send({ kind: 'stop' });
    expect(readProject(doc).gnutellaConfigurations.get('a')).toEqual({ maximumKnownPeers: 7 });
    expect(readProject(doc).gnutellaConfigurations.get('b')).toEqual({ maximumKnownPeers: 3 });
  });

  it('refuses what the window never hands over', () => {
    const { views, act, errors } = setUp();
    act('a', 'join', { address: '192.168.0.300' });
    act('a', 'join', { address: 5 });
    act('a', 'search', { criteria: 3 });
    act('a', 'download', { row: 0 });
    act('a', 'download', { row: -1 });
    act('a', 'download', { row: 0.5 });
    act('a', 'setMaximumPeers', { count: -1 });
    act('a', 'setMaximumPeers', { count: '4' });
    act('a', 'setMaximumPeers', { count: 2_147_483_648 });
    act('a', 'restart');
    act('switch', 'leave');
    expect(errors).toEqual(['badArgs', 'badArgs', 'badArgs', 'badArgs', 'badArgs', 'badArgs', 'badArgs', 'badArgs', 'badArgs', 'unknownAction', 'unknownApp']);
    expect(views.get('switch')).toBeNull();
  });
});