import Delta from 'quill-delta';
import Quill from '../../../core';
import { getLastChangeIndex } from '../../../modules/history';

const { registry } = Quill.getNamespace();

describe('History', function() {
  describe('getLastChangeIndex', function() {
    it('delete', function() {
      const delta = new Delta().retain(4).delete(2);
      expect(getLastChangeIndex(registry, delta)).toEqual(4);
    });

    it('delete with inserts', function() {
      const delta = new Delta()
        .retain(4)
        .insert('test')
        .delete(2);
      expect(getLastChangeIndex(registry, delta)).toEqual(8);
    });

    it('insert text', function() {
      const delta = new Delta().retain(4).insert('testing');
      expect(getLastChangeIndex(registry, delta)).toEqual(11);
    });

    it('insert embed', function() {
      const delta = new Delta().retain(4).insert({ image: true });
      expect(getLastChangeIndex(registry, delta)).toEqual(5);
    });

    it('insert with deletes', function() {
      const delta = new Delta()
        .retain(4)
        .delete(3)
        .insert('!');
      expect(getLastChangeIndex(registry, delta)).toEqual(5);
    });

    it('format', function() {
      const delta = new Delta().retain(4).retain(3, { bold: true });
      expect(getLastChangeIndex(registry, delta)).toEqual(7);
    });

    it('format newline', function() {
      const delta = new Delta().retain(4).retain(1, { align: 'left' });
      expect(getLastChangeIndex(registry, delta)).toEqual(4);
    });

    it('format mixed', function() {
      const delta = new Delta()
        .retain(4)
        .retain(1, { align: 'left', bold: true });
      expect(getLastChangeIndex(registry, delta)).toEqual(4);
    });

    it('insert newline', function() {
      const delta = new Delta().retain(4).insert('a\n');
      expect(getLastChangeIndex(registry, delta)).toEqual(5);
    });

    it('mutliple newline inserts', function() {
      const delta = new Delta().retain(4).insert('ab\n\n');
      expect(getLastChangeIndex(registry, delta)).toEqual(7);
    });
  });

  describe('undo/redo', function() {
    beforeEach(function() {
      this.initialize(HTMLElement, '<div><p>The lazy fox</p></div>');
      this.quill = new Quill(this.container.firstChild, {
        modules: {
          history: { delay: 400 },
        },
      });
      this.original = this.quill.getContents();
    });

    it('limits undo stack size', function() {
      const quill = new Quill(this.container.firstChild, {
        modules: {
          history: { delay: 0, maxStack: 2 },
        },
      });
      ['A', 'B', 'C'].forEach(function(text) {
        quill.insertText(0, text);
      });
      expect(quill.history.stack.undo.length).toEqual(2);
    });

    it('user change', function() {
      this.quill.root.firstChild.innerHTML = 'The lazy foxes';
      this.quill.update();
      const changed = this.quill.getContents();
      expect(changed).not.toEqual(this.original);
      this.quill.history.undo();
      expect(this.quill.getContents()).toEqual(this.original);
      this.quill.history.redo();
      expect(this.quill.getContents()).toEqual(changed);
    });

    it('merge changes', function() {
      expect(this.quill.history.stack.undo.length).toEqual(0);
      this.quill.updateContents(new Delta().retain(12).insert('e'));
      expect(this.quill.history.stack.undo.length).toEqual(1);
      this.quill.updateContents(new Delta().retain(13).insert('s'));
      expect(this.quill.history.stack.undo.length).toEqual(1);
      this.quill.history.undo();
      expect(this.quill.getContents()).toEqual(this.original);
      expect(this.quill.history.stack.undo.length).toEqual(0);
    });

    it('dont merge changes', function(done) {
      expect(this.quill.history.stack.undo.length).toEqual(0);
      this.quill.updateContents(new Delta().retain(12).insert('e'));
      expect(this.quill.history.stack.undo.length).toEqual(1);
      setTimeout(() => {
        this.quill.updateContents(new Delta().retain(13).insert('s'));
        expect(this.quill.history.stack.undo.length).toEqual(2);
        done();
      }, this.quill.history.options.delay * 1.25);
    });

    it('multiple undos', function(done) {
      expect(this.quill.history.stack.undo.length).toEqual(0);
      this.quill.updateContents(new Delta().retain(12).insert('e'));
      const contents = this.quill.getContents();
      setTimeout(() => {
        this.quill.updateContents(new Delta().retain(13).insert('s'));
        this.quill.history.undo();
        expect(this.quill.getContents()).toEqual(contents);
        this.quill.history.undo();
        expect(this.quill.getContents()).toEqual(this.original);
        done();
      }, this.quill.history.options.delay * 1.25);
    });

    it('transform api change', function() {
      this.quill.history.options.userOnly = true;
      this.quill.updateContents(
        new Delta().retain(12).insert('es'),
        Quill.sources.USER,
      );
      this.quill.history.lastRecorded = 0;
      this.quill.updateContents(
        new Delta().retain(14).insert('!'),
        Quill.sources.USER,
      );
      this.quill.history.undo();
      this.quill.updateContents(
        new Delta().retain(4).delete(5),
        Quill.sources.API,
      );
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('The foxes\n'),
      );
      this.quill.history.undo();
      expect(this.quill.getContents()).toEqual(new Delta().insert('The fox\n'));
      this.quill.history.redo();
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('The foxes\n'),
      );
      this.quill.history.redo();
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('The foxes!\n'),
      );
    });

    it('transform preserve intention', function() {
      const url = 'https://www.google.com/';
      this.quill.history.options.userOnly = true;
      this.quill.updateContents(
        new Delta().insert(url, { link: url }),
        Quill.sources.USER,
      );
      this.quill.history.lastRecorded = 0;
      this.quill.updateContents(
        new Delta().delete(url.length).insert('Google', { link: url }),
        Quill.sources.API,
      );
      this.quill.history.lastRecorded = 0;
      this.quill.updateContents(
        new Delta().retain(this.quill.getLength() - 1).insert('!'),
        Quill.sources.USER,
      );
      this.quill.history.lastRecorded = 0;
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('Google', { link: url }).insert('The lazy fox!\n'),
      );
      this.quill.history.undo();
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('Google', { link: url }).insert('The lazy fox\n'),
      );
      this.quill.history.undo();
      expect(this.quill.getContents()).toEqual(
        new Delta().insert('Google', { link: url }).insert('The lazy fox\n'),
      );
    });

    it('ignore remote changes', function() {
      this.quill.history.options.delay = 0;
      this.quill.history.options.userOnly = true;
      this.quill.setText('\n');
      this.quill.insertText(0, 'a', Quill.sources.USER);
      this.quill.insertText(1, 'b', Quill.sources.API);
      this.quill.insertText(2, 'c', Quill.sources.USER);
      this.quill.insertText(3, 'd', Quill.sources.API);
      expect(this.quill.getText()).toEqual('abcd\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('abd\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('bd\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('abd\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('abcd\n');
    });

    it('correctly transform against remote changes', function() {
      this.quill.history.options.delay = 0;
      this.quill.history.options.userOnly = true;
      this.quill.setText('b\n');
      this.quill.insertText(1, 'd', Quill.sources.USER);
      this.quill.insertText(0, 'a', Quill.sources.USER);
      this.quill.insertText(2, 'c', Quill.sources.API);
      expect(this.quill.getText()).toEqual('abcd\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('bcd\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('bc\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('bcd\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('abcd\n');
    });

    it('correctly transform against remote changes breaking up an insert', function() {
      this.quill.history.options.delay = 0;
      this.quill.history.options.userOnly = true;
      this.quill.setText('\n');
      this.quill.insertText(0, 'ABC', Quill.sources.USER);
      this.quill.insertText(3, '4', Quill.sources.API);
      this.quill.insertText(2, '3', Quill.sources.API);
      this.quill.insertText(1, '2', Quill.sources.API);
      this.quill.insertText(0, '1', Quill.sources.API);
      expect(this.quill.getText()).toEqual('1A2B3C4\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('1234\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('1A2B3C4\n');
      this.quill.history.undo();
      expect(this.quill.getText()).toEqual('1234\n');
      this.quill.history.redo();
      expect(this.quill.getText()).toEqual('1A2B3C4\n');
    });
  });
});