// A device's files in the document: read as a file system, changed through
// the core's operations, a text file's Y.Text found in any case, and the
// document's files into a running engine's — what differs only.

import { describe, expect, it } from 'vitest';
import * as Y from 'yjs';
import { saveTextAs, VirtualFileSystem } from '@mdg-filius/core';
import { addDevice, changeFiles, emptyProject, fileText, nodeFiles, readFilesInto, ROOTS, writeProject } from '../src/index.js';

function setUp() {
  const doc = new Y.Doc();
  writeProject(doc, emptyProject());
  let counter = 0;
  addDevice(doc, { kind: 'pc', id: 'pc', name: 'PC', x: 0, y: 0, newId: () => `port-${++counter}` }, 'me');
  const files = () => doc.getMap<Y.Map<unknown>>(ROOTS.nodes).get('pc')!.get('files') as Y.Map<Y.Map<unknown>> | undefined;
  return { doc, files };
}

const paths = (fileSystem: VirtualFileSystem) => fileSystem.allEntries().map((entry) => [entry.path, entry.content.kind === 'text' ? entry.content.text : entry.content.kind]);

describe("a device's files in the document", () => {
  it('are changed through the core, written with the origin, what changed only', () => {
    const { doc, files } = setUp();
    expect(paths(nodeFiles(doc, 'pc')!)).toEqual([['/', 'directory']]);
    expect(nodeFiles(doc, 'none')).toBeUndefined();
    const origins: unknown[] = [];
    doc.on('update', (_update: Uint8Array, origin: unknown) => origins.push(origin));
    expect(changeFiles(doc, 'pc', 'me', (fileSystem) => saveTextAs(fileSystem, '/', 'a.txt', 'Anfang Ende'))).toBe('saved');
    expect(origins).toEqual(['me']);
    expect((files()!.get('/a.txt')!.get('text') as Y.Text).toString()).toBe('Anfang Ende');
    // Nothing changed: nothing written.
    expect(changeFiles(doc, 'pc', 'me', (fileSystem) => fileSystem.contains('/a.txt'))).toBe(true);
    expect(origins).toHaveLength(1);
    expect(changeFiles(doc, 'none', 'me', () => 'ran')).toBeUndefined();
  });

  it("finds a text file's Y.Text in any case, and none for a folder, an image or what is not there", () => {
    const { doc } = setUp();
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.writeTextFile('/Notiz.txt', 'x');
      fileSystem.createDirectory('/ordner');
      fileSystem.writeImageFile('/bild.png', new Uint8Array([1]), 'image/png');
    });
    const text = fileText(doc, 'pc', '/Notiz.txt');
    expect(text?.toString()).toBe('x');
    expect(fileText(doc, 'pc', '/NOTIZ.TXT')).toBe(text);
    expect([fileText(doc, 'pc', '/ordner'), fileText(doc, 'pc', '/bild.png'), fileText(doc, 'pc', '/fehlt.txt'), fileText(doc, 'none', '/Notiz.txt')]).toEqual([
      undefined,
      undefined,
      undefined,
      undefined,
    ]);
    const empty = new Y.Doc();
    writeProject(empty, emptyProject());
    addDevice(empty, { kind: 'pc', id: 'pc', name: 'PC', x: 0, y: 0, newId: () => 'port' }, 'me');
    expect(fileText(empty, 'pc', '/Notiz.txt')).toBeUndefined();
  });

  it("go into a running engine's file system, what differs only: new ones after the others, changed ones in their place, gone ones removed", () => {
    const { doc } = setUp();
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.createDirectory('/ordner');
      fileSystem.writeTextFile('/ordner/a.txt', 'a');
      fileSystem.writeTextFile('/b.txt', 'b');
      fileSystem.writeTextFile('/Gross.txt', 'G');
      fileSystem.writeImageFile('/bild.png', new Uint8Array([1]), 'image/png');
      fileSystem.writeBinaryFile('/daten.bin', new Uint8Array([2]));
    });
    const engine = nodeFiles(doc, 'pc')!;
    engine.writeTextFile('/eigen.txt', 'the engine wrote it');
    // Alike but for the engine's own file: it goes, the others stay as they are.
    expect(readFilesInto(doc, 'pc', engine)).toBe(true);
    expect(paths(engine)).toEqual(paths(nodeFiles(doc, 'pc')!));
    const revision = engine.revision;
    expect(readFilesInto(doc, 'pc', engine)).toBe(false);
    expect(engine.revision).toBe(revision);
    // A text changed, an image, a binary file, a folder turned into a file and a file into a folder, a new one.
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.writeTextFile('/b.txt', 'b2');
      fileSystem.writeImageFile('/bild.png', new Uint8Array([3]), 'image/png');
      fileSystem.writeBinaryFile('/daten.bin', new Uint8Array([2]), 'application/octet-stream');
      fileSystem.deleteItem('/ordner', true);
      fileSystem.writeTextFile('/ordner', 'now a file');
      fileSystem.deleteItem('/b.txt');
      fileSystem.createDirectory('/b.txt');
      fileSystem.writeTextFile('/neu.txt', 'neu');
    });
    expect(readFilesInto(doc, 'pc', engine)).toBe(true);
    expect(paths(engine)).toEqual(paths(nodeFiles(doc, 'pc')!));
    expect(
      engine
        .entriesInCreationOrder('/')
        .map((entry) => entry.path)
        .at(-1),
    ).toBe('/neu.txt');
    expect(engine.imageFile('/bild.png').data).toEqual(new Uint8Array([3]));
    expect(engine.entry('/daten.bin').content).toEqual({ kind: 'binary', data: new Uint8Array([2]), mediaType: 'application/octet-stream' });
    expect(readFilesInto(doc, 'none', engine)).toBe(false);
    // A file in a new folder; then a folder with all in it removed; a name changed only in case comes with its spelling.
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.createDirectory('/neu');
      fileSystem.createDirectory('/neu/tiefer');
      fileSystem.writeTextFile('/neu/tiefer/c.txt', 'c');
    });
    expect(readFilesInto(doc, 'pc', engine)).toBe(true);
    expect(engine.textFile('/neu/tiefer/c.txt')).toBe('c');
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.deleteItem('/neu', true);
      fileSystem.renameInPlace('/neu.txt', 'NEU.txt');
    });
    expect(readFilesInto(doc, 'pc', engine)).toBe(true);
    expect(paths(engine)).toEqual(paths(nodeFiles(doc, 'pc')!));
    expect(engine.contains('/neu')).toBe(false);
    expect(engine.entry('/neu.txt').path).toBe('/NEU.txt');
    // What stayed keeps its place, a name in capitals too.
    const order = (fileSystem: VirtualFileSystem) => fileSystem.entriesInCreationOrder('/').map((entry) => entry.path);
    expect(order(engine)).toEqual(order(nodeFiles(doc, 'pc')!));
    expect(order(engine).indexOf('/Gross.txt')).toBeLessThan(order(engine).indexOf('/NEU.txt'));
    // So also in a folder: a file renamed there keeps its place, in the document and in the engine.
    changeFiles(doc, 'pc', 'me', (fileSystem) => {
      fileSystem.createDirectory('/tief');
      fileSystem.writeTextFile('/tief/x', 'x');
      fileSystem.writeTextFile('/tief/y.txt', 'y');
    });
    readFilesInto(doc, 'pc', engine);
    changeFiles(doc, 'pc', 'me', (fileSystem) => fileSystem.renameInPlace('/tief/x', 'x.txt'));
    expect(nodeFiles(doc, 'pc')!.entriesInCreationOrder('/tief').map((entry) => entry.path)).toEqual(['/tief/x.txt', '/tief/y.txt']);
    readFilesInto(doc, 'pc', engine);
    expect(engine.entriesInCreationOrder('/tief').map((entry) => entry.path)).toEqual(['/tief/x.txt', '/tief/y.txt']);
  });

  it('leave out what the file system refuses, as the editor draws it', () => {
    const { doc, files } = setUp();
    changeFiles(doc, 'pc', 'me', (fileSystem) => fileSystem.writeTextFile('/a.txt', 'a'));
    // Two people gave a name at once in different case: one file, the first name, the later text (as fileSystemOf reads it); one in a folder not there is left out.
    doc.transact(() => {
      const entry = new Y.Map<unknown>();
      entry.set('order', 5);
      entry.set('kind', 'text');
      entry.set('text', new Y.Text('A'));
      files()!.set('/A.TXT', entry);
      const lost = new Y.Map<unknown>();
      lost.set('order', 6);
      lost.set('kind', 'text');
      lost.set('text', new Y.Text('lost'));
      files()!.set('/fehlt/x.txt', lost);
    });
    const engine = new VirtualFileSystem();
    expect(readFilesInto(doc, 'pc', engine)).toBe(true);
    expect(paths(engine)).toEqual([
      ['/', 'directory'],
      ['/a.txt', 'A'],
    ]);
  });
});