import { Assertions, Chain, Mouse, NamedChain, TestStore, UiFinder } from '@ephox/agar';
import { UnitTest } from '@ephox/bedrock-client';
import { Result } from '@ephox/katamari';
import { Css, SugarElement } from '@ephox/sugar';

import * as Behaviour from 'ephox/alloy/api/behaviour/Behaviour';
import { Dragging } from 'ephox/alloy/api/behaviour/Dragging';
import * as GuiFactory from 'ephox/alloy/api/component/GuiFactory';
import { Container } from 'ephox/alloy/api/ui/Container';
import * as GuiSetup from 'ephox/alloy/test/GuiSetup';

interface StoreMouseDragEventTest {
  readonly left: number;
  readonly top: number;
}

UnitTest.asynctest('MouseDragEventTest', (success, failure) => {
  GuiSetup.setup((store: TestStore<StoreMouseDragEventTest>, _doc, _body) => GuiFactory.build(
    Container.sketch({
      dom: {
        styles: {
          width: '100px',
          height: '100px',
          border: '1px solid green'
        }
      },
      containerBehaviours: Behaviour.derive([
        Dragging.config({
          mode: 'mouse',
          repositionTarget: false,
          blockerClass: 'test-blocker',
          onDrag: (_comp, _targetElem, delta) => {
            store.adder({ left: delta.left, top: delta.top })();
          }
        })
      ])
    })
  ), (_doc, _body, gui, component, store) => {
    const cAssertNoPositionInfo = Chain.op((box: SugarElement<HTMLElement>) => {
      Assertions.assertEq('Should be no "left"', true, Css.getRaw(box, 'left').isNone());
      Assertions.assertEq('Should be no "top"', true, Css.getRaw(box, 'top').isNone());
    });

    return [
      Chain.asStep({}, [
        NamedChain.asChain([
          store.cClear,
          NamedChain.writeValue('box', component.element),
          NamedChain.direct('box', Mouse.cMouseDown, '_'),
          NamedChain.writeValue('container', gui.element),
          NamedChain.direct('container', UiFinder.cFindIn('.test-blocker'), 'blocker'),

          NamedChain.direct('blocker', Mouse.cMouseMoveTo(100, 200), '_'),
          store.cAssertEq('Checking that no drag events have fired yet', [ ]),
          NamedChain.direct('blocker', Mouse.cMouseMoveTo(120, 200), '_'),
          store.cAssertEq('Checking that a drag event has fired with (20, 0) delta', [{ left: 20, top: 0 }]),
          NamedChain.direct('box', cAssertNoPositionInfo, '_'),
          NamedChain.direct('blocker', Mouse.cMouseUp, '_'),
          store.cClear,

          NamedChain.direct('box', Mouse.cMouseDown, '_'),
          NamedChain.direct('container', UiFinder.cFindIn('.test-blocker'), 'blocker'),
          NamedChain.direct('blocker', Mouse.cMouseMoveTo(300, 100), '_'),
          store.cAssertEq('The state should have been reset, so one position should not give us a delta', [ ]),
          NamedChain.direct('blocker', Mouse.cMouseMoveTo(303, 100), '_'),
          store.cAssertEq('The state should have been reset, so two positions should give us a delta of (3, 0)', [{ left: 3, top: 0 }]),
          NamedChain.bundle((output) => Result.value(output))
        ])
      ])
    ];
  }, success, failure);
});
