const field = function (name, placeholder) {
  const inputSpec = Memento.record(Input.sketch({
    placeholder,
    onSetValue (input, data) {
      // If the value changes, inform the container so that it can update whether the "x" is visible
      AlloyTriggers.emit(input, NativeEvents.input());
    },
    inputBehaviours: Behaviour.derive([
      Composing.config({
        find: Option.some
      }),
      Tabstopping.config({ }),
      Keying.config({
        mode: 'execution'
      })
    ]),
    selectOnFocus: false
  }));

  const buttonSpec = Memento.record(
    Button.sketch({
      dom: UiDomFactory.dom('<button class="${prefix}-input-container-x ${prefix}-icon-cancel-circle ${prefix}-icon"></button>'),
      action (button) {
        const input = inputSpec.get(button);
        Representing.setValue(input, '');
      }
    })
  );

  return {
    name,
    spec: Container.sketch({
      dom: UiDomFactory.dom('<div class="${prefix}-input-container"></div>'),
      components: [
        inputSpec.asSpec(),
        buttonSpec.asSpec()
      ],
      containerBehaviours: Behaviour.derive([
        Toggling.config({
          toggleClass: Styles.resolve('input-container-empty')
        }),
        Composing.config({
          find (comp) {
            return Option.some(inputSpec.get(comp));
          }
        }),
        AddEventsBehaviour.config(clearInputBehaviour, [
          // INVESTIGATE: Because this only happens on input,
          // it won't reset unless it has an initial value
          AlloyEvents.run(NativeEvents.input(), function (iContainer) {
            const input = inputSpec.get(iContainer);
            const val = Representing.getValue(input);
            const f = val.length > 0 ? Toggling.off : Toggling.on;
            f(iContainer);
          })
        ])
      ])
    })
  };
};

export function renderInsertTableMenuItem(spec: Menu.FancyMenuItem): ItemTypes.WidgetItemSpec {
  const numRows = 10;
  const numColumns = 10;
  const sizeLabelId = Id.generate('size-label');
  const cells = makeCells(sizeLabelId, numRows, numColumns);

  const memLabel = Memento.record({
    dom: {
      tag: 'span',
      classes: ['tox-insert-table-picker__label'],
      attributes: {
        id: sizeLabelId
      }
    },
    components: [GuiFactory.text('0x0')],
    behaviours: Behaviour.derive([
      Replacing.config({})
    ])
  });

  return {
    type: 'widget',
    data: { value: Id.generate('widget-id')},
    dom: {
      tag: 'div',
      classes: ['tox-fancymenuitem'],
    },
    autofocus: true,
    components: [ItemWidget.parts().widget({
      dom: {
        tag: 'div',
        classes: ['tox-insert-table-picker']
      },
      components: makeComponents(cells).concat(memLabel.asSpec()),
      behaviours: Behaviour.derive([
        AddEventsBehaviour.config('insert-table-picker', [
          AlloyEvents.runWithTarget<CellEvent>(cellOverEvent, (c, t, e) => {
            const row = e.event().row();
            const col = e.event().col();
            selectCells(cells, row, col, numRows, numColumns);
            Replacing.set(memLabel.get(c), [makeLabelText(row, col)]);
          }),
          AlloyEvents.runWithTarget<CellEvent>(cellExecuteEvent, (c, _, e) => {
            spec.onAction({numRows: e.event().row() + 1, numColumns: e.event().col() + 1});
            AlloyTriggers.emit(c, SystemEvents.sandboxClose());
          })
        ]),
        Keying.config({
          initSize: {
            numRows,
            numColumns
          },
          mode: 'flatgrid',
          selector: '[role="button"]'
        })
      ])
    })]
  };
}

const sketch = function (rawSpec) {
  const spec = ValueSchema.asRawOrDie('SizeSlider', schema, rawSpec);

  const isValidValue = function (valueIndex) {
    return valueIndex >= 0 && valueIndex < spec.sizes.length;
  };

  const onChange = function (slider, thumb, valueIndex) {
    if (isValidValue(valueIndex)) {
      spec.onChange(valueIndex);
    }
  };

  return Slider.sketch({
    dom: {
      tag: 'div',
      classes: [
        Styles.resolve('slider-' + spec.category + '-size-container'),
        Styles.resolve('slider'),
        Styles.resolve('slider-size-container') ]
    },
    onChange,
    onDragStart (slider, thumb) {
      Toggling.on(thumb);
    },
    onDragEnd (slider, thumb) {
      Toggling.off(thumb);
    },
    min: 0,
    max: spec.sizes.length - 1,
    stepSize: 1,
    getInitialValue: spec.getInitialValue,
    snapToGrid: true,

    sliderBehaviours: Behaviour.derive([
      Receivers.orientation(Slider.refresh)
    ]),

    components: [
      Slider.parts().spectrum({
        dom: UiDomFactory.dom('<div class="${prefix}-slider-size-container"></div>'),
        components: [
          UiDomFactory.spec('<div class="${prefix}-slider-size-line"></div>')
        ]
      }),

      Slider.parts().thumb({
        dom: UiDomFactory.dom('<div class="${prefix}-slider-thumb"></div>'),
        behaviours: Behaviour.derive([
          Toggling.config({
            toggleClass: Styles.resolve('thumb-active')
          })
        ])
      })
    ]
  });
};

const renderReplacableIconFromPack = (iconName: string, iconsProvider: IconProvider): SimpleOrSketchSpec => {
  return renderIcon(getIcon(iconName, iconsProvider), {
    behaviours: Behaviour.derive([
      Replacing.config({ })
    ])
  });
};

const renderSpinner = (providerBackstage: UiFactoryBackstageProviders): AlloySpec => {
  return {
    dom: {
      tag: 'div',
      attributes: {
        'aria-label': providerBackstage.translate('Loading...')
      },
      classes: [ 'tox-throbber__busy-spinner' ]
    },
    components: [
      {
        dom: DomFactory.fromHtml(`<div class="tox-spinner"><div></div><div></div><div></div></div>`)
      }
    ],
    behaviours: Behaviour.derive([
      // Trap the "Tab" key and don't let it escape.
      Keying.config({
        mode: 'special',
        onTab: () => Option.some(true),
        onShiftTab: () => Option.some(true)
      }),
      Focusing.config({ })
    ])
  };
};

  const makeGroup = function (gSpec) {
    const scrollClass = gSpec.scrollable === true ? '${prefix}-toolbar-scrollable-group' : '';
    return {
      dom: UiDomFactory.dom('<div aria-label="' + gSpec.label + '" class="${prefix}-toolbar-group ' + scrollClass + '"></div>'),

      tgroupBehaviours: Behaviour.derive([
        AddEventsBehaviour.config('adhoc-scrollable-toolbar', gSpec.scrollable === true ? [
          AlloyEvents.runOnInit(function (component, simulatedEvent) {
            Css.set(component.element(), 'overflow-x', 'auto');
            Scrollables.markAsHorizontal(component.element());
            Scrollable.register(component.element());
          })
        ] : [ ])
      ]),

      components: [
        Container.sketch({
          components: [
            ToolbarGroup.parts().items({ })
          ]
        })
      ],
      markers: {
        // TODO: Now that alloy isn't marking the items with the old
        // itemClass here, this navigation probably doesn't work. But
        // it's mobile. However, bluetooth keyboards will need to be fixed
        // Essentially, all items put in the toolbar will need to be given
        // this class if they are to be part of keyboard navigation
        itemSelector: '.' + Styles.resolve('toolbar-group-item')
      },

      items: gSpec.items
    };
  };

const makeItem = function (value, text, selected, preview, isMenu) {
  return {
    data: {
      value,
      text
    },
    type: 'item',
    dom: {
      tag: 'div',
      classes: isMenu ? [ Styles.resolve('styles-item-is-menu') ] : [ ]
    },
    toggling: {
      toggleOnExecute: false,
      toggleClass: Styles.resolve('format-matches'),
      selected
    },
    itemBehaviours: Behaviour.derive(isMenu ? [ ] : [
      Receivers.format(value, function (comp, status) {
        const toggle = status ? Toggling.on : Toggling.off;
        toggle(comp);
      })
    ]),
    components: [
      {
        dom: {
          tag: 'div',
          attributes: {
            style: preview
          },
          innerHtml: text
        }
      }
    ]
  };
};

const makeCell = (row, col, labelId) => {
  const emitCellOver = (c) => AlloyTriggers.emitWith(c, cellOverEvent, {row, col} );
  const emitExecute = (c) => AlloyTriggers.emitWith(c, cellExecuteEvent, {row, col} );

  return GuiFactory.build({
    dom: {
      tag: 'div',
      attributes: {
        role: 'button',
        ['aria-labelledby']: labelId
      }
    },
    behaviours: Behaviour.derive([
      AddEventsBehaviour.config('insert-table-picker-cell', [
        AlloyEvents.run(NativeEvents.mouseover(), Focusing.focus),
        AlloyEvents.run(SystemEvents.execute(), emitExecute),
        AlloyEvents.run(SystemEvents.tapOrClick(), emitExecute)
      ]),
      Toggling.config({
        toggleClass: 'tox-insert-table-picker__selected',
        toggleOnExecute: false
      }),
      Focusing.config({onFocus: emitCellOver})
    ])
  });
};

const renderToolbarGroupCommon = (toolbarGroup: ToolbarGroup) => {
  const attributes = toolbarGroup.title.fold(() => {
    return {};
  },
    (title) => {
      return { attributes: { title } };
    });
  return {
    dom: {
      tag: 'div',
      classes: ['tox-toolbar__group'],
      ...attributes
    },

    components: [
      AlloyToolbarGroup.parts().items({})
    ],

    items: toolbarGroup.items,
    markers: {
      // nav within a group breaks if disabled buttons are first in their group so skip them
      itemSelector: '*:not(.tox-split-button) > .tox-tbtn:not([disabled]), .tox-split-button:not([disabled]), .tox-toolbar-nav-js:not([disabled])'
    },
    tgroupBehaviours: Behaviour.derive([
      Tabstopping.config({}),
      Focusing.config({})
    ])
  };
};

export const renderLabel = (spec: Types.Label.Label, backstageShared: UiFactoryBackstageShared): SimpleSpec => {
  const label = {
    dom: {
      tag: 'label',
      innerHtml: backstageShared.providers.translate(spec.label),
      classes: ['tox-label']
    }
  } as AlloySpec;
  const comps = Arr.map(spec.items, backstageShared.interpreter);
  return {
    dom: {
      tag: 'div',
      classes: ['tox-form__group']
    },
    components: [
      label
    ].concat(comps),
    behaviours: Behaviour.derive([
      ComposingConfigs.self(),
      Replacing.config({}),
      RepresentingConfigs.domHtml(Option.none()),
      Keying.config({
        mode: 'acyclic'
      }),
    ])
  };
};