// The text editor window against Java's (packages/sim/test/
// textEditorWindow.java.json, TextEditorWindowRun): Java's steps played on a
// computer with a web server, the same files, the dialog's lists, the title
// and the text after each; where Java errs, what the window does instead
// (textEditor.ts names each), and where the text is the document's — typed
// is written — what follows from it.

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 { folderEntries } from '@mdg-filius/core';
import { addDevice, changeFiles, emptyProject, fileText, nodeFiles, replaceText, ROOTS, setSoftware, writeProject } from '@mdg-filius/doc';
import { TextEditorWindow, textEditorWindow } from '../src/desktop/textEditor.js';
import { translate } from '../src/i18n/i18n.js';

interface JavaStep {
  readonly step: string;
  readonly title: string;
  readonly text: string;
  readonly dialog?: readonly {
    readonly title: string;
    readonly labels: readonly string[];
    readonly entries: readonly string[];
  }[];
  readonly files: readonly (readonly [string, string, string])[];
}

const java = JSON.parse(readFileSync(join(dirname(fileURLToPath(import.meta.url)), '../../sim/test/textEditorWindow.java.json'), 'utf8')) as { steps: JavaStep[] };
const at = (name: string) => {
  const found = java.steps.find((each) => each.step === name);
  if (found === undefined) throw new Error(`no step ${name}`);
  return found;
};

/** The files outside the web server's folder: a folder as null, a text as it is (Java's oracle gives a file of another type by its length). */
type Files = Record<string, string | null>;
const outsideWebServer = (path: string) => !path.startsWith('/webserver');

function javaFiles(step: JavaStep): Files {
  return Object.fromEntries(
    step.files
      .filter(([path]) => outsideWebServer(path))
      .map(([path, type, content]) => [path === '/' ? '/' : path.replace(/\/$/, ''), type === 'folder' ? null : content === '(0 characters)' ? '' : content]),
  );
}

const PROGRAM = translate('de', 'program.textEditor');

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-${++counter}` }, 'me');
  setSoftware(doc, 'pc', { install: ['webServer', 'textEditor', 'commandPrompt'], remove: [] }, 'de', 'me');
  const window = new TextEditorWindow(doc, 'pc');
  const files = (): Files =>
    Object.fromEntries(
      nodeFiles(doc, 'pc')!
        .allEntries()
        .filter((entry) => entry.path !== '/' && outsideWebServer(entry.path))
        .map((entry) => [entry.path, entry.content.kind === 'directory' ? null : entry.content.kind === 'text' ? entry.content.text : entry.content.kind]),
    );
  const shown = () => ({ title: window.title(PROGRAM), text: window.text, files: files() });
  /** Another program writes a file (Java's setDateiInhalt). */
  const outside = (path: string, text: string) => doc.transact(() => replaceText(fileText(doc, 'pc', path)!, text), 'other');
  /** The command line beside the window. */
  const command = (change: Parameters<typeof changeFiles>[3]) => changeFiles(doc, 'pc', 'terminal', change);
  /** The dialog's list of a folder, as Java's list writes its entries. */
  const entries = (folder: string) => folderEntries(nodeFiles(doc, 'pc')!, folder).map((entry) => `${entry.kind === 'folder' ? 'Ordner' : 'Datei'};${entry.name}`);
  return { doc, window, files, shown, outside, command, entries };
}

/** Java's title, text and files after a step, with what differs here. */
function expected(name: string, change: { title?: string; text?: string; files?: Files } = {}) {
  const step = at(name);
  return { title: change.title ?? step.title, text: change.text ?? step.text, files: { ...javaFiles(step), ...change.files } };
}

describe("the text editor window, against Java's", () => {
  it("plays Java's steps: the same where Java is right, as named where it errs", () => {
    const { window, files, shown, outside, command, entries } = setUp();
    expect(shown()).toEqual(expected('open'));

    // A new text: „Speichern“ asks for a name, and the dialog lists the folder.
    window.input('Erste Zeile\nZweite Zeile');
    expect(window.save()).toBe('askName');
    expect(entries('/')).toEqual(at('save new as notiz.txt').dialog![0]!.entries);
    expect(window.saveAs('/', 'notiz.txt')).toBe('saved');
    expect(shown()).toEqual(expected('save new as notiz.txt'));
    window.input('Erste Zeile\nZweite Zeile\nDritte Zeile');
    expect(window.save()).toBe('saved');
    expect(shown()).toEqual(expected('save'));

    // Another program writes the open file: the window shows it.
    outside('/notiz.txt', 'von außen');
    expect(shown()).toEqual(expected('changed outside, nothing typed'));
    // Typed is written: another's change meets it in the file, and the window shows the file (Java keeps its copy).
    window.input('getippt');
    expect(files()['/notiz.txt']).toBe('getippt');
    outside('/notiz.txt', 'wieder von außen');
    expect(shown()).toEqual(expected('changed outside after typing', { text: 'wieder von außen' }));

    // The dialog: a folder's list, a file opened there, by name in any case, by a path.
    command((fileSystem) => {
      fileSystem.createDirectory('/ordner');
      fileSystem.writeTextFile('/ordner/b.txt', '');
    });
    const dialog = at('open ordner/b.txt by double clicks').dialog!;
    expect([entries('/'), entries('/ordner')]).toEqual([dialog[0]!.entries, dialog[1]!.entries]);
    expect(window.open('/ordner', 'b.txt')).toBe('opened');
    expect(shown()).toEqual(expected('open ordner/b.txt by double clicks'));
    expect(window.open('/', 'NOTIZ.TXT')).toBe('opened');
    expect(shown()).toEqual(expected('open NOTIZ.TXT'));
    expect(window.open('/', 'ordner/b.txt')).toBe('opened');
    expect(shown()).toEqual(expected('open ordner/b.txt by name'));
    // Not there, no name, an image: said so, b.txt stays open (Java forgets it, shows the image's Base64 text).
    expect(window.open('/', 'fehlt.txt')).toBe('notFound');
    expect(shown()).toEqual(expected('open fehlt.txt', { title: `${PROGRAM} - b.txt` }));
    expect(window.save()).toBe('saved');
    expect(window.open('/', '')).toBe('notFound');
    expect(entries('/webserver')).toEqual(at("open the web server's image").dialog![1]!.entries);
    expect(window.open('/webserver', 'splashscreen-mini.png')).toBe('notText');
    expect(shown()).toEqual(expected('open without a name', { title: `${PROGRAM} - b.txt` }));

    // „Speichern unter“ onto notiz.txt in other case: that file, its name in the title, and later typing still goes there.
    expect(window.open('/', 'notiz.txt')).toBe('opened');
    window.input('vor dem Speichern unter');
    expect(window.saveAs('/', 'NOTIZ.TXT')).toBe('saved');
    expect(shown()).toEqual(expected('save as NOTIZ.TXT over notiz.txt', { title: `${PROGRAM} - notiz.txt` }));
    window.input('nach dem Speichern unter');
    const noteText = { '/notiz.txt': 'nach dem Speichern unter' };
    expect(shown()).toEqual(expected('save after save as over a file', { title: `${PROGRAM} - notiz.txt`, files: noteText }));

    // „Speichern unter“ a new file in a folder: typed goes into the open file first (here notiz.txt), then the new one has it.
    window.input('neu im Ordner');
    noteText['/notiz.txt'] = 'neu im Ordner';
    expect(window.saveAs('/ordner', 'c.txt')).toBe('saved');
    expect(shown()).toEqual(expected('save as ordner/c.txt', { files: noteText }));
    window.input('neu im Ordner, geändert');
    expect(shown()).toEqual(expected('save after save as a new file', { files: noteText }));

    // The open file removed: its text stays as a new text, and „Speichern“ asks for a name (Java's is lost).
    command((fileSystem) => fileSystem.deleteItem('/ordner/c.txt'));
    expect(shown()).toEqual(expected('open file removed', { title: PROGRAM, files: noteText }));
    expect(window.gone).toBe('/ordner/c.txt');
    window.input('nach dem Löschen');
    expect(window.save()).toBe('askName');
    expect(shown()).toEqual(expected('save after the file was removed', { title: PROGRAM, files: noteText }));

    // A name with a folder in it is that folder's file (Java's file is named "ordner/d.txt" in the root); no name is refused.
    expect(window.saveAs('/', 'ordner/d.txt')).toBe('saved');
    expect(window.gone).toBeNull();
    expect(shown()).toEqual(expected('save as ordner/d.txt', { title: `${PROGRAM} - d.txt`, files: noteText }));
    expect(entries('/')).not.toContain('Datei;ordner/d.txt');
    expect(window.saveAs('/', '')).toBe('invalidName');
    const withoutNameless = Object.fromEntries(Object.entries(expected('save as without a name').files).filter(([path]) => path !== '/'));
    expect(shown()).toEqual({ ...expected('save as without a name', { title: `${PROGRAM} - d.txt` }), files: { ...withoutNameless, ...noteText } });

    window.newText();
    expect({ ...shown(), files: {} }).toEqual({ ...expected('new'), files: {} });
  });

  it("names Java's dialog, its folder's label aside", () => {
    const dialog = at('save new as notiz.txt').dialog![0]!;
    expect(dialog.title).toBe(translate('de', 'fileDialog.saveTitle'));
    expect(dialog.labels).toEqual([`${translate('de', 'fileDialog.folder')} root`, translate('de', 'fileDialog.name')]);
    expect(at('open ordner/b.txt by double clicks').dialog![0]!.title).toBe(translate('de', 'fileDialog.openTitle'));
  });
});

describe('the text editor window beyond the steps', () => {
  it("follows the open file when another's write replaces its entry, and takes back only its own typing", () => {
    const { doc, window } = setUp();
    window.input('eins');
    window.saveAs('/', 'a.txt');
    const files = doc.getMap<Y.Map<unknown>>(ROOTS.nodes).get('pc')!.get('files') as Y.Map<Y.Map<unknown>>;
    let seen = window.version;
    const stop = window.subscribe(() => (seen = window.version));
    // Another replaces the entry (a text again): the window follows to the new text.
    doc.transact(() => {
      const entry = new Y.Map<unknown>();
      entry.set('order', files.get('/a.txt')!.get('order'));
      entry.set('kind', 'text');
      entry.set('text', new Y.Text('ersetzt'));
      files.set('/a.txt', entry);
    }, 'other');
    expect([window.path, window.text, window.file]).toEqual(['/a.txt', 'ersetzt', fileText(doc, 'pc', '/a.txt')]);
    expect(seen).toBe(window.version);
    // Own typing is taken back, another's not.
    window.input('ersetzt und getippt');
    doc.transact(() => fileText(doc, 'pc', '/a.txt')!.insert(0, '>'), 'other');
    window.undo();
    expect(window.text).toBe('>ersetzt');
    window.redo();
    expect(window.text).toBe('>ersetzt und getippt');
    stop();
    window.input('x');
    expect(seen).toBeLessThan(window.version);
  });

  it('keeps a new text and changes nothing for the same typing, and is the same window for a computer while the editor runs', () => {
    const { doc, window } = setUp();
    const before = window.version;
    window.input('');
    expect(window.version).toBe(before);
    window.input('neu');
    window.newText();
    expect([window.text, window.path, window.file]).toEqual(['', null, undefined]);
    expect(textEditorWindow(doc, 'pc')).toBe(textEditorWindow(doc, 'pc'));
    expect(textEditorWindow(doc, 'pc')).not.toBe(textEditorWindow(doc, 'other'));
    expect(textEditorWindow(new Y.Doc(), 'pc')).not.toBe(textEditorWindow(doc, 'pc'));
    // A file removed while open is gone until another opens; „Neu“ ends it too.
    window.input('a');
    window.saveAs('/', 'a.txt');
    window.saveAs('/', 'b.txt');
    changeFiles(doc, 'pc', 'terminal', (files) => files.deleteItem('/b.txt'));
    expect([window.gone, window.text]).toEqual(['/b.txt', 'a']);
    expect(window.open('/', 'a.txt')).toBe('opened');
    expect(window.gone).toBeNull();
    changeFiles(doc, 'pc', 'terminal', (files) => files.deleteItem('/a.txt'));
    expect(window.gone).toBe('/a.txt');
    window.newText();
    expect(window.gone).toBeNull();
    // A computer the document does not have: nothing opens, nothing is saved.
    const missing = new TextEditorWindow(doc, 'none');
    expect(missing.open('/', 'a.txt')).toBe('notFound');
    expect(missing.saveAs('/', 'a.txt')).toBe('folderMissing');
  });
});