import { describe, test, expect } from 'vitest'
import { TextEditor } from './TextEditor'

/* @vitest-environment jsdom */
describe('TextEditor', () => {
  test('Creating TextEditor without element should throw', () => {
    expect(() => new TextEditor()).toThrowError('Invalid text editor element');
  });

  test('Creating TextEditor with element should success', () => {
    expect(new TextEditor(document.createElement('div'))).toBeInstanceOf(TextEditor);
  });

  test('isEmpty should return true when editor is empty', () => {
    const textEditor = new TextEditor(document.createElement("div"));
    expect(textEditor).toBeInstanceOf(TextEditor);
    expect(textEditor.isEmpty).toBe(true);
  });

  test('Num paragraphs should return 1 when empty', () => {
    const textEditor = new TextEditor(document.createElement("div"));
    expect(textEditor).toBeInstanceOf(TextEditor);
    expect(textEditor.numParagraphs).toBe(1);
  });

  test('Num paragraphs should return the number of paragraphs', () => {
    const textEditor = new TextEditor(document.createElement("div"));
    textEditor.root = textEditor.createRoot([
      textEditor.createParagraph([
        textEditor.createInlineFromString('Hello, World!')
      ]),
      textEditor.createParagraph([
        textEditor.createInlineFromString('')
      ]),
      textEditor.createParagraph([
        textEditor.createInlineFromString('¡Hola, Mundo!')
      ]),
      textEditor.createParagraph([
        textEditor.createInlineFromString('Hallo, Welt!')
      ])
    ]);
    expect(textEditor).toBeInstanceOf(TextEditor);
    expect(textEditor.numParagraphs).toBe(4);
  });

  test('Disposing a TextEditor nullifies everything', () => {
    const textEditor = new TextEditor(document.createElement("div"));
    expect(textEditor).toBeInstanceOf(TextEditor);
    textEditor.dispose();
    expect(textEditor.root).toBe(null);
    expect(textEditor.element).toBe(null);
  });

  test('TextEditor focus should focus the contenteditable element', () => {
    const textEditorElement = document.createElement("div");
    document.body.appendChild(textEditorElement);
    const textEditor = new TextEditor(textEditorElement);
    expect(textEditor).toBeInstanceOf(TextEditor);
    textEditor.focus();
    expect(document.activeElement).toBe(textEditor.element);
  });

  test("TextEditor blur should blur the contenteditable element", () => {
    const textEditorElement = document.createElement("div");
    document.body.appendChild(textEditorElement);
    const textEditor = new TextEditor(textEditorElement);
    expect(textEditor).toBeInstanceOf(TextEditor);
    textEditor.focus();
    textEditor.blur();
    expect(document.activeElement).not.toBe(textEditor.element);
  });

  test("TextEditor focus -> blur -> focus should restore old selection", () => {
    const textEditorElement = document.createElement("div");
    document.body.appendChild(textEditorElement);
    const textEditor = new TextEditor(textEditorElement);
    textEditor.root = textEditor.createRoot([
      textEditor.createParagraph([
        textEditor.createInlineFromString("Hello, World!")
      ])
    ]);
    expect(textEditor).toBeInstanceOf(TextEditor);
    textEditor.focus();
    textEditor.blur();
    textEditor.focus();
    expect(document.activeElement).toBe(textEditor.element);
  });

  test("TextEditor selectAll should select all the contenteditable", () => {
    const selection = document.getSelection();
    const textEditorElement = document.createElement("div");
    document.body.appendChild(textEditorElement);
    const textEditor = new TextEditor(textEditorElement);
    expect(textEditor).toBeInstanceOf(TextEditor);
    textEditor.focus();
    textEditor.selectAll();
    expect(document.activeElement).toBe(textEditor.element);
    expect(selection.containsNode(textEditor.root));
  });
});