import '../../../instrumented/editor/jquery.min.js';

import { NS } from '../../../instrumented/common/namespaces.js';
import * as transformlist from '../../../instrumented/svgcanvas/svgtransformlist.js';
import * as utilities from '../../../instrumented/svgcanvas/utilities.js';
import * as hstory from '../../../instrumented/svgcanvas/history.js';

describe('history', function () {
  // TODO(codedread): Write tests for handling history events.

  // Mocked out methods.
  transformlist.changeRemoveElementFromListMap(() => { /* empty fn */ });

  utilities.mock({
    getHref () { return '#foo'; },
    setHref () { /* empty fn */ },
    getRotationAngle () { return 0; }
  });

  // const svg = document.createElementNS(NS.SVG, 'svg');
  let undoMgr = null;

  class MockCommand extends hstory.Command {
    constructor (optText) {
      super();
      this.text = optText;
    }
    apply (handler) {
      super.apply(handler, () => { /* empty fn */ });
    }
    unapply (handler) {
      super.unapply(handler, () => { /* empty fn */ });
    }
    elements () { return []; } // eslint-disable-line class-methods-use-this
  }

  /*
  class MockHistoryEventHandler {
    handleHistoryEvent (eventType, command) {}
  }
  */

  /**
   * Set up tests (with undo manager).
   * @returns {void}
   */
  beforeEach(function () {
    undoMgr = new hstory.UndoManager();

    document.body.textContent = '';
    this.divparent = document.createElement('div');
    this.divparent.id = 'divparent';
    this.divparent.style.visibility = 'hidden';

    for (let i = 1; i <= 5; i++) {
      const div = document.createElement('div');
      const id = `div${i}`;
      div.id = id;
      this[id] = div;
    }

    this.divparent.append(this.div1, this.div2, this.div3);

    this.div4.style.visibility = 'hidden';
    this.div4.append(this.div5);

    document.body.append(this.divparent, this.div);
  });
  /**
   * Tear down tests, destroying undo manager.
   * @returns {void}
   */
  afterEach(() => {
    undoMgr = null;
  });

  it('Test svgedit.history package', function () {
    assert.ok(hstory);
    assert.ok(hstory.MoveElementCommand);
    assert.ok(hstory.InsertElementCommand);
    assert.ok(hstory.ChangeElementCommand);
    assert.ok(hstory.RemoveElementCommand);
    assert.ok(hstory.BatchCommand);
    assert.ok(hstory.UndoManager);
    assert.equal(typeof hstory.MoveElementCommand, typeof function () { /* empty fn */ });
    assert.equal(typeof hstory.InsertElementCommand, typeof function () { /* empty fn */ });
    assert.equal(typeof hstory.ChangeElementCommand, typeof function () { /* empty fn */ });
    assert.equal(typeof hstory.RemoveElementCommand, typeof function () { /* empty fn */ });
    assert.equal(typeof hstory.BatchCommand, typeof function () { /* empty fn */ });
    assert.equal(typeof hstory.UndoManager, typeof function () { /* empty fn */ });
  });

  it('Test UndoManager methods', function () {
    assert.ok(undoMgr);
    assert.ok(undoMgr.addCommandToHistory);
    assert.ok(undoMgr.getUndoStackSize);
    assert.ok(undoMgr.getRedoStackSize);
    assert.ok(undoMgr.resetUndoStack);
    assert.ok(undoMgr.getNextUndoCommandText);
    assert.ok(undoMgr.getNextRedoCommandText);

    assert.equal(typeof undoMgr, typeof {});
    assert.equal(typeof undoMgr.addCommandToHistory, typeof function () { /* empty fn */ });
    assert.equal(typeof undoMgr.getUndoStackSize, typeof function () { /* empty fn */ });
    assert.equal(typeof undoMgr.getRedoStackSize, typeof function () { /* empty fn */ });
    assert.equal(typeof undoMgr.resetUndoStack, typeof function () { /* empty fn */ });
    assert.equal(typeof undoMgr.getNextUndoCommandText, typeof function () { /* empty fn */ });
    assert.equal(typeof undoMgr.getNextRedoCommandText, typeof function () { /* empty fn */ });
  });

  it('Test UndoManager.addCommandToHistory() function', function () {
    assert.equal(undoMgr.getUndoStackSize(), 0);
    undoMgr.addCommandToHistory(new MockCommand());
    assert.equal(undoMgr.getUndoStackSize(), 1);
    undoMgr.addCommandToHistory(new MockCommand());
    assert.equal(undoMgr.getUndoStackSize(), 2);
  });

  it('Test UndoManager.getUndoStackSize() and getRedoStackSize() functions', function () {
    undoMgr.addCommandToHistory(new MockCommand());
    undoMgr.addCommandToHistory(new MockCommand());
    undoMgr.addCommandToHistory(new MockCommand());

    assert.equal(undoMgr.getUndoStackSize(), 3);
    assert.equal(undoMgr.getRedoStackSize(), 0);

    undoMgr.undo();
    assert.equal(undoMgr.getUndoStackSize(), 2);
    assert.equal(undoMgr.getRedoStackSize(), 1);

    undoMgr.undo();
    assert.equal(undoMgr.getUndoStackSize(), 1);
    assert.equal(undoMgr.getRedoStackSize(), 2);

    undoMgr.undo();
    assert.equal(undoMgr.getUndoStackSize(), 0);
    assert.equal(undoMgr.getRedoStackSize(), 3);

    undoMgr.undo();
    assert.equal(undoMgr.getUndoStackSize(), 0);
    assert.equal(undoMgr.getRedoStackSize(), 3);

    undoMgr.redo();
    assert.equal(undoMgr.getUndoStackSize(), 1);
    assert.equal(undoMgr.getRedoStackSize(), 2);

    undoMgr.redo();
    assert.equal(undoMgr.getUndoStackSize(), 2);
    assert.equal(undoMgr.getRedoStackSize(), 1);

    undoMgr.redo();
    assert.equal(undoMgr.getUndoStackSize(), 3);
    assert.equal(undoMgr.getRedoStackSize(), 0);

    undoMgr.redo();
    assert.equal(undoMgr.getUndoStackSize(), 3);
    assert.equal(undoMgr.getRedoStackSize(), 0);
  });

  it('Test UndoManager.resetUndoStackSize() function', function () {
    undoMgr.addCommandToHistory(new MockCommand());
    undoMgr.addCommandToHistory(new MockCommand());
    undoMgr.addCommandToHistory(new MockCommand());
    undoMgr.undo();

    assert.equal(undoMgr.getUndoStackSize(), 2);
    assert.equal(undoMgr.getRedoStackSize(), 1);

    undoMgr.resetUndoStack();

    assert.equal(undoMgr.getUndoStackSize(), 0);
    assert.equal(undoMgr.getRedoStackSize(), 0);
  });

  it('Test UndoManager.getNextUndoCommandText() function', function () {
    assert.equal(undoMgr.getNextUndoCommandText(), '');

    undoMgr.addCommandToHistory(new MockCommand('First'));
    undoMgr.addCommandToHistory(new MockCommand('Second'));
    undoMgr.addCommandToHistory(new MockCommand('Third'));

    assert.equal(undoMgr.getNextUndoCommandText(), 'Third');

    undoMgr.undo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'Second');

    undoMgr.undo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'First');

    undoMgr.undo();
    assert.equal(undoMgr.getNextUndoCommandText(), '');

    undoMgr.redo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'First');

    undoMgr.redo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'Second');

    undoMgr.redo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'Third');

    undoMgr.redo();
    assert.equal(undoMgr.getNextUndoCommandText(), 'Third');
  });

  it('Test UndoManager.getNextRedoCommandText() function', function () {
    assert.equal(undoMgr.getNextRedoCommandText(), '');

    undoMgr.addCommandToHistory(new MockCommand('First'));
    undoMgr.addCommandToHistory(new MockCommand('Second'));
    undoMgr.addCommandToHistory(new MockCommand('Third'));

    assert.equal(undoMgr.getNextRedoCommandText(), '');

    undoMgr.undo();
    assert.equal(undoMgr.getNextRedoCommandText(), 'Third');

    undoMgr.undo();
    assert.equal(undoMgr.getNextRedoCommandText(), 'Second');

    undoMgr.undo();
    assert.equal(undoMgr.getNextRedoCommandText(), 'First');

    undoMgr.redo();
    assert.equal(undoMgr.getNextRedoCommandText(), 'Second');

    undoMgr.redo();
    assert.equal(undoMgr.getNextRedoCommandText(), 'Third');

    undoMgr.redo();
    assert.equal(undoMgr.getNextRedoCommandText(), '');
  });

  it('Test UndoManager.undo() and redo() functions', function () {
    let lastCalled = null;
    const cmd1 = new MockCommand();
    const cmd2 = new MockCommand();
    const cmd3 = new MockCommand();
    cmd1.apply = function () { lastCalled = 'cmd1.apply'; };
    cmd2.apply = function () { lastCalled = 'cmd2.apply'; };
    cmd3.apply = function () { lastCalled = 'cmd3.apply'; };
    cmd1.unapply = function () { lastCalled = 'cmd1.unapply'; };
    cmd2.unapply = function () { lastCalled = 'cmd2.unapply'; };
    cmd3.unapply = function () { lastCalled = 'cmd3.unapply'; };

    undoMgr.addCommandToHistory(cmd1);
    undoMgr.addCommandToHistory(cmd2);
    undoMgr.addCommandToHistory(cmd3);

    assert.ok(!lastCalled);

    undoMgr.undo();
    assert.equal(lastCalled, 'cmd3.unapply');

    undoMgr.redo();
    assert.equal(lastCalled, 'cmd3.apply');

    undoMgr.undo();
    undoMgr.undo();
    assert.equal(lastCalled, 'cmd2.unapply');

    undoMgr.undo();
    assert.equal(lastCalled, 'cmd1.unapply');
    lastCalled = null;

    undoMgr.undo();
    assert.ok(!lastCalled);

    undoMgr.redo();
    assert.equal(lastCalled, 'cmd1.apply');

    undoMgr.redo();
    assert.equal(lastCalled, 'cmd2.apply');

    undoMgr.redo();
    assert.equal(lastCalled, 'cmd3.apply');
    lastCalled = null;

    undoMgr.redo();
    assert.ok(!lastCalled);
  });

  it('Test MoveElementCommand', function () {
    let move = new hstory.MoveElementCommand(this.div3, this.div1, this.divparent);
    assert.ok(move.unapply);
    assert.ok(move.apply);
    assert.equal(typeof move.unapply, typeof function () { /* empty fn */ });
    assert.equal(typeof move.apply, typeof function () { /* empty fn */ });

    move.unapply();
    assert.equal(this.divparent.firstElementChild, this.div3);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div1);
    assert.equal(this.divparent.lastElementChild, this.div2);

    move.apply();
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div2);
    assert.equal(this.divparent.lastElementChild, this.div3);

    move = new hstory.MoveElementCommand(this.div1, null, this.divparent);

    move.unapply();
    assert.equal(this.divparent.firstElementChild, this.div2);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div3);
    assert.equal(this.divparent.lastElementChild, this.div1);

    move.apply();
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div2);
    assert.equal(this.divparent.lastElementChild, this.div3);

    move = new hstory.MoveElementCommand(this.div2, this.div5, this.div4);

    move.unapply();
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div3);
    assert.equal(this.divparent.lastElementChild, this.div3);
    assert.equal(this.div4.firstElementChild, this.div2);
    assert.equal(this.div4.firstElementChild.nextElementSibling, this.div5);

    move.apply();
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.divparent.firstElementChild.nextElementSibling, this.div2);
    assert.equal(this.divparent.lastElementChild, this.div3);
    assert.equal(this.div4.firstElementChild, this.div5);
    assert.equal(this.div4.lastElementChild, this.div5);
  });

  it('Test InsertElementCommand', function () {
    let insert = new hstory.InsertElementCommand(this.div3);
    assert.ok(insert.unapply);
    assert.ok(insert.apply);
    assert.equal(typeof insert.unapply, typeof function () { /* empty fn */ });
    assert.equal(typeof insert.apply, typeof function () { /* empty fn */ });

    insert.unapply();
    assert.equal(this.divparent.childElementCount, 2);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.divparent.lastElementChild, this.div2);

    insert.apply();
    assert.equal(this.divparent.childElementCount, 3);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);

    insert = new hstory.InsertElementCommand(this.div2);

    insert.unapply();
    assert.equal(this.divparent.childElementCount, 2);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div3);
    assert.equal(this.divparent.lastElementChild, this.div3);

    insert.apply();
    assert.equal(this.divparent.childElementCount, 3);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);
  });

  it('Test RemoveElementCommand', function () {
    const div6 = document.createElement('div');
    div6.id = 'div6';

    let remove = new hstory.RemoveElementCommand(div6, null, this.divparent);
    assert.ok(remove.unapply);
    assert.ok(remove.apply);
    assert.equal(typeof remove.unapply, typeof function () { /* empty fn */ });
    assert.equal(typeof remove.apply, typeof function () { /* empty fn */ });

    remove.unapply();
    assert.equal(this.divparent.childElementCount, 4);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);
    assert.equal(this.div3.nextElementSibling, div6);

    remove.apply();
    assert.equal(this.divparent.childElementCount, 3);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);

    remove = new hstory.RemoveElementCommand(div6, this.div2, this.divparent);

    remove.unapply();
    assert.equal(this.divparent.childElementCount, 4);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, div6);
    assert.equal(div6.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);

    remove.apply();
    assert.equal(this.divparent.childElementCount, 3);
    assert.equal(this.divparent.firstElementChild, this.div1);
    assert.equal(this.div1.nextElementSibling, this.div2);
    assert.equal(this.div2.nextElementSibling, this.div3);
  });

  it('Test ChangeElementCommand', function () {
    this.div1.setAttribute('title', 'new title');
    let change = new hstory.ChangeElementCommand(this.div1,
      { title: 'old title', class: 'foo' });
    assert.ok(change.unapply);
    assert.ok(change.apply);
    assert.equal(typeof change.unapply, typeof function () { /* empty fn */ });
    assert.equal(typeof change.apply, typeof function () { /* empty fn */ });

    change.unapply();
    assert.equal(this.div1.getAttribute('title'), 'old title');
    assert.equal(this.div1.getAttribute('class'), 'foo');

    change.apply();
    assert.equal(this.div1.getAttribute('title'), 'new title');
    assert.ok(!this.div1.getAttribute('class'));

    this.div1.textContent = 'inner text';
    change = new hstory.ChangeElementCommand(this.div1,
      { '#text': null });

    change.unapply();
    assert.ok(!this.div1.textContent);

    change.apply();
    assert.equal(this.div1.textContent, 'inner text');

    this.div1.textContent = '';
    change = new hstory.ChangeElementCommand(this.div1,
      { '#text': 'old text' });

    change.unapply();
    assert.equal(this.div1.textContent, 'old text');

    change.apply();
    assert.ok(!this.div1.textContent);

    // TODO(codedread): Refactor this #href stuff in history.js and svgcanvas.js
    const rect = document.createElementNS(NS.SVG, 'rect');
    let justCalled = null;
    let gethrefvalue = null;
    let sethrefvalue = null;
    utilities.mock({
      getHref (elem) {
        assert.equal(elem, rect);
        justCalled = 'getHref';
        return gethrefvalue;
      },
      setHref (elem, val) {
        assert.equal(elem, rect);
        assert.equal(val, sethrefvalue);
        justCalled = 'setHref';
      },
      getRotationAngle () { return 0; }
    });

    gethrefvalue = '#newhref';
    change = new hstory.ChangeElementCommand(rect,
      { '#href': '#oldhref' });
    assert.equal(justCalled, 'getHref');

    justCalled = null;
    sethrefvalue = '#oldhref';
    change.unapply();
    assert.equal(justCalled, 'setHref');

    justCalled = null;
    sethrefvalue = '#newhref';
    change.apply();
    assert.equal(justCalled, 'setHref');

    const line = document.createElementNS(NS.SVG, 'line');
    line.setAttribute('class', 'newClass');
    change = new hstory.ChangeElementCommand(line, { class: 'oldClass' });

    assert.ok(change.unapply);
    assert.ok(change.apply);
    assert.equal(typeof change.unapply, typeof function () { /* empty fn */ });
    assert.equal(typeof change.apply, typeof function () { /* empty fn */ });

    change.unapply();
    assert.equal(line.getAttribute('class'), 'oldClass');

    change.apply();
    assert.equal(line.getAttribute('class'), 'newClass');
  });

  it('Test BatchCommand', function () {
    let concatResult = '';
    MockCommand.prototype.apply = function () { concatResult += this.text; };

    const batch = new hstory.BatchCommand();
    assert.ok(batch.unapply);
    assert.ok(batch.apply);
    assert.ok(batch.addSubCommand);
    assert.ok(batch.isEmpty);
    assert.equal(typeof batch.unapply, 'function');
    assert.equal(typeof batch.apply, 'function');
    assert.equal(typeof batch.addSubCommand, 'function');
    assert.equal(typeof batch.isEmpty, 'function');

    assert.ok(batch.isEmpty());

    batch.addSubCommand(new MockCommand('a'));
    assert.ok(!batch.isEmpty());
    batch.addSubCommand(new MockCommand('b'));
    batch.addSubCommand(new MockCommand('c'));

    assert.ok(!concatResult);
    batch.apply();
    assert.equal(concatResult, 'abc');

    MockCommand.prototype.apply = function () { /* empty fn */ };
    MockCommand.prototype.unapply = function () { concatResult += this.text; };
    concatResult = '';
    assert.ok(!concatResult);
    batch.unapply();
    assert.equal(concatResult, 'cba');

    MockCommand.prototype.unapply = function () { /* empty fn */ };
  });
});