// The editor's way to its shared document (packages/editor's
// connectSharedDoc, F5.3b) against a real server F: ready with the
// document, and whether the person only reads, and whether the project is
// frozen; frozen and thawed while it is open — thawed, the document comes
// anew (what was changed while reading must not stay in the page's copy);
// refused without a session; let go when the grant ends or the project is
// deleted; and let go by the editor.

import { randomUUID } from 'node:crypto';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import WebSocket from 'ws';
import { addDevice } from '@mdg-filius/doc';
import { peersOf } from '../../editor/src/remote/presence.js';
import { connectSharedDoc, type SharedDocState } from '../../editor/src/remote/sharedDoc.js';
import { PostgresSessions, PostgresStore } from '../src/index.js';
import { testDatabase, type TestDatabase } from './database.js';
import { newProject, SERVICE_KEY, signIn, startTestServer, until, type TestServer } from './harness.js';

let database: TestDatabase;
let store: PostgresStore;
let sessions: PostgresSessions;

beforeAll(async () => {
  database = await testDatabase();
  store = PostgresStore.connect(database.url);
  sessions = new PostgresSessions(store.pool);
  await store.migrate();
  await sessions.migrate();
}, 60_000);

afterAll(async () => {
  await store?.close();
  await database?.stop();
});

/** The editor's connection as a browser with this cookie makes it; the states it went through. */
function connectEditor(server: TestServer, project: string, cookie?: string) {
  class Browser extends WebSocket {
    constructor(url: string, protocols?: string | string[]) {
      super(url, protocols, { headers: cookie === undefined ? {} : { cookie } });
      this.on('error', () => {});
    }
  }
  const states: SharedDocState[] = [];
  const close = connectSharedDoc({ server: server.base, project, onState: (state) => states.push(state), WebSocketPolyfill: Browser });
  const last = () => states.at(-1)!;
  return { states, last, close, ready: () => until(() => last().kind === 'ready') };
}

const service = (server: TestServer, path: string, body: unknown, method = 'POST') =>
  fetch(`${server.base}${path}`, { method, headers: { 'x-filius-service-key': SERVICE_KEY }, body: JSON.stringify(body) });

describe("the editor's shared document", () => {
  it('is ready with the document, writable with a write grant and read-only with a read grant', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const writer = connectEditor(server, project, await signIn(server, project));
    await writer.ready();
    expect(writer.states[0]).toEqual({ kind: 'connecting' });
    expect(writer.last()).toMatchObject({ kind: 'ready', readOnly: false, frozen: false });
    const doc = (writer.last() as Extract<SharedDocState, { kind: 'ready' }>).doc;
    addDevice(doc, { id: 'a', kind: 'pc', name: 'Rechner', x: 0, y: 0, newId: randomUUID }, 'person');
    const reader = connectEditor(server, project, await signIn(server, project, { level: 'read' }));
    await reader.ready();
    expect(reader.last()).toMatchObject({ kind: 'ready', readOnly: true, frozen: false });
    await until(() => (reader.last() as Extract<SharedDocState, { kind: 'ready' }>).doc.getMap('nodes').size === 1);
    writer.close();
    reader.close();
    await server.close();
  });

  it('knows who it is, from F, and sees the others through the awareness', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const [miaId, benId] = [randomUUID(), randomUUID()];
    const mia = connectEditor(server, project, await signIn(server, project, { user: miaId, name: 'Mia' }));
    const ben = connectEditor(server, project, await signIn(server, project, { user: benId, name: 'Ben', level: 'read' }));
    await mia.ready();
    await ben.ready();
    const miaReady = mia.last() as Extract<SharedDocState, { kind: 'ready' }>;
    const benReady = ben.last() as Extract<SharedDocState, { kind: 'ready' }>;
    expect(miaReady.you).toEqual({ id: miaId, name: 'Mia', color: '#3366cc' });
    expect(benReady.you).toMatchObject({ id: benId, name: 'Ben' });
    // A reader is seen too: the awareness is not the document.
    benReady.awareness.setLocalState({ v: 1, user: benReady.you, selection: 'router', windows: [], moving: null });
    await until(() => peersOf(miaReady.awareness.getStates(), miaReady.awareness.clientID).length === 1);
    expect(peersOf(miaReady.awareness.getStates(), miaReady.awareness.clientID)[0]!.state).toEqual({ v: 1, user: benReady.you, selection: 'router', windows: [], moving: null });
    // Gone, he is gone for her too.
    ben.close();
    await until(() => peersOf(miaReady.awareness.getStates(), miaReady.awareness.clientID).length === 0);
    mia.close();
    await server.close();
  });

  it('reads while the project is frozen and gets the document anew when it is thawed', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const editor = connectEditor(server, project, await signIn(server, project));
    await editor.ready();
    const first = (editor.last() as Extract<SharedDocState, { kind: 'ready' }>).doc;
    await service(server, `/svc/projects/${project}/freeze`, { frozen: true });
    await until(() => editor.last().kind === 'ready' && (editor.last() as Extract<SharedDocState, { kind: 'ready' }>).frozen);
    expect(editor.last()).toMatchObject({ kind: 'ready', readOnly: true, frozen: true, doc: first });
    // A change that got there anyway while it read: F did not take it.
    addDevice(first, { id: 'stray', kind: 'pc', name: 'Rechner', x: 0, y: 0, newId: randomUUID }, 'person');
    await service(server, `/svc/projects/${project}/freeze`, { frozen: false });
    await until(() => editor.last().kind === 'ready' && !(editor.last() as Extract<SharedDocState, { kind: 'ready' }>).readOnly);
    const fresh = editor.last() as Extract<SharedDocState, { kind: 'ready' }>;
    expect(fresh.doc).not.toBe(first);
    expect(fresh.doc.getMap('nodes').size).toBe(0);
    expect(editor.states.map((state) => state.kind).slice(-2)).toEqual(['connecting', 'ready']);
    // Writing works again: another person sees it.
    addDevice(fresh.doc, { id: 'b', kind: 'pc', name: 'Rechner', x: 0, y: 0, newId: randomUUID }, 'person');
    const other = connectEditor(server, project, await signIn(server, project));
    await other.ready();
    await until(() => (other.last() as Extract<SharedDocState, { kind: 'ready' }>).doc.getMap('nodes').size === 1);
    editor.close();
    other.close();
    await server.close();
  });

  it('starts frozen and says so', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    await service(server, `/svc/projects/${project}/freeze`, { frozen: true });
    const editor = connectEditor(server, project, await signIn(server, project));
    await until(() => editor.last().kind === 'ready' && (editor.last() as Extract<SharedDocState, { kind: 'ready' }>).frozen);
    expect(editor.last()).toMatchObject({ readOnly: true, frozen: true });
    editor.close();
    await server.close();
  });

  it('is refused without a session, and let go when the grant ends or the project is deleted', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const stranger = connectEditor(server, project);
    await until(() => stranger.last().kind === 'refused');
    expect(stranger.last()).toEqual({ kind: 'refused', reason: 'notSignedIn' });
    const user = randomUUID();
    const editor = connectEditor(server, project, await signIn(server, project, { user }));
    await editor.ready();
    await service(server, '/svc/revoke', { user, project });
    await until(() => editor.last().kind === 'closed');
    expect(editor.last()).toEqual({ kind: 'closed', reason: 'revoked' });
    const other = connectEditor(server, project, await signIn(server, project));
    await other.ready();
    await service(server, `/svc/projects/${project}`, undefined, 'DELETE');
    await until(() => other.last().kind === 'closed');
    expect(other.last()).toEqual({ kind: 'closed', reason: 'deleted' });
    expect(server.sync.hocuspocus.getConnectionsCount()).toBe(0);
    await server.close();
  });

  it('stays ready when only the network drops, and comes back by itself', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const editor = connectEditor(server, project, await signIn(server, project));
    await editor.ready();
    const doc = (editor.last() as Extract<SharedDocState, { kind: 'ready' }>).doc;
    for (const connection of server.sync.connections(project)) connection.webSocket.terminate();
    await until(() => server.sync.connections(project).length === 1, 10_000);
    expect(editor.last()).toMatchObject({ kind: 'ready', doc });
    addDevice(doc, { id: 'after', kind: 'pc', name: 'Rechner', x: 0, y: 0, newId: randomUUID }, 'person');
    await until(async () => (await store.pending(project)) === 1);
    editor.close();
    await server.close();
  });

  it('lets go when the editor does, and tells nothing after', async () => {
    const server = await startTestServer(store, sessions);
    const project = await newProject(store);
    const editor = connectEditor(server, project, await signIn(server, project));
    await editor.ready();
    const count = editor.states.length;
    editor.close();
    await until(() => server.sync.hocuspocus.getConnectionsCount() === 0);
    await service(server, `/svc/projects/${project}/freeze`, { frozen: true });
    await new Promise((resolve) => setTimeout(resolve, 200));
    expect(editor.states).toHaveLength(count);
    await server.close();
  });
});