const sketch = function (editor): SketchSpec {
  const pickerDom = {
    tag: 'input',
    attributes: { accept: 'image/*', type: 'file', title: '' },
     // Visibility hidden so that it cannot be seen, and position absolute so that it doesn't
    // disrupt the layout
    styles: { visibility: 'hidden', position: 'absolute' }
  };

  const memPicker = Memento.record({
    dom: pickerDom,
    events: AlloyEvents.derive([
      // Stop the event firing again at the button level
      AlloyEvents.cutter(NativeEvents.click()),

      AlloyEvents.run(NativeEvents.change(), function (picker, simulatedEvent) {
        extractBlob(simulatedEvent).each(function (blob) {
          addImage(editor, blob);
        });
      })
    ])
  });

  return Button.sketch({
    dom: Buttons.getToolbarIconButton('image', editor),
    components: [
      memPicker.asSpec()
    ],
    action (button) {
      const picker = memPicker.get(button);
      // Trigger a dom click for the file input
      picker.element().dom().click();
    }
  });
};

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);
          })
        ])
      ])
    })
  };
};

const renderCommonStructure = (icon: Option<string>, text: Option<string>, tooltip: Option<string>, receiver: Option<string>, behaviours: Option<Behaviour.NamedConfiguredBehaviour<Behaviour.BehaviourConfigSpec, Behaviour.BehaviourConfigDetail>[]>, providersBackstage: UiFactoryBackstageProviders) => {

  // If RTL and icon is in whitelist, add RTL icon class for icons that don't have a `-rtl` icon available.
  // Use `-rtl` icon suffix for icons that do.

  const getIconName = (iconName: string): string => {
    return I18n.isRtl() && Arr.contains(rtlIcon, iconName) ? iconName + '-rtl' : iconName;
  };
  const needsRtlClass = I18n.isRtl() && icon.exists((name) => Arr.contains(rtlTransform, name));

  return {
    dom: {
      tag: 'button',
      classes: [ ToolbarButtonClasses.Button ].concat(text.isSome() ? [ ToolbarButtonClasses.MatchWidth ] : []).concat(needsRtlClass ? [ ToolbarButtonClasses.IconRtl ] : []),
      attributes: getTooltipAttributes(tooltip, providersBackstage)
    },
    components: componentRenderPipeline([
      icon.map((iconName) => renderIconFromPack(getIconName(iconName), providersBackstage.icons)),
      text.map((text) => renderLabel(text, ToolbarButtonClasses.Button, providersBackstage))
    ]),

    eventOrder: {
      [NativeEvents.mousedown()]: [
        'focusing',
        'alloy.base.behaviour',
        'common-button-display-events'
      ]
    },

    buttonBehaviours: Behaviour.derive(
      [
        AddEventsBehaviour.config('common-button-display-events', [
          AlloyEvents.run(NativeEvents.mousedown(), (button, se) => {
            se.event().prevent();
            AlloyTriggers.emit(button, focusButtonEvent);
          })
        ])
      ].concat(
        receiver.map((r) => {
          return Reflecting.config({
            channel: r,
            initialData: { icon, text },
            renderComponents: (data, _state) => {
              return componentRenderPipeline([
                data.icon.map((iconName) => renderIconFromPack(getIconName(iconName), providersBackstage.icons)),
                data.text.map((text) => renderLabel(text, ToolbarButtonClasses.Button, providersBackstage))
              ]);
            }
          });
        }).toArray()
      ).concat(behaviours.getOr([ ]))
    )
  };
};

 const getFieldPart = (isField1) => AlloyFormField.parts().field({
   factory: AlloyInput,
   inputClasses: ['tox-textfield'],
   inputBehaviours: Behaviour.derive([
     Tabstopping.config({}),
     AddEventsBehaviour.config('size-input-events', [
       AlloyEvents.run(NativeEvents.focusin(), function (component, simulatedEvent) {
         AlloyTriggers.emitWith(component, ratioEvent, { isField1 });
       }),
       AlloyEvents.run(NativeEvents.change(), function (component, simulatedEvent) {
         AlloyTriggers.emitWith(component, formChangeEvent, { name: spec.name });
       })
     ])
   ]),
   selectOnFocus: false
 });

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 triggerTab = function (placeholder, shiftKey) {
  AlloyTriggers.emitWith(placeholder, NativeEvents.keydown(), {
    raw: {
      which: 9,
      shiftKey
    }
  });
};

export const renderSelectBox = (spec: Types.SelectBox.SelectBox, providersBackstage: UiFactoryBackstageProviders): SketchSpec => {
  const translatedOptions = Arr.map(spec.items, (item) => {
    return {
      text: providersBackstage.translate(item.text),
      value: item.value
    };
  });

  // DUPE with TextField.
  const pLabel = spec.label.map((label) => renderLabel(label, providersBackstage));

  const pField = AlloyFormField.parts().field({
    // TODO: Alloy should not allow dom changing of an HTML select!
    dom: {  },
    selectAttributes: {
      size: spec.size
    },
    options: translatedOptions,
    factory: AlloyHtmlSelect,
    selectBehaviours: Behaviour.derive([
      Tabstopping.config({ }),
      AddEventsBehaviour.config('selectbox-change', [
        AlloyEvents.run(NativeEvents.change(), (component, _) => {
          AlloyTriggers.emitWith(component, formChangeEvent, { name: spec.name } );
        })
      ])
    ])
  });

  const chevron = spec.size > 1 ? Option.none() :
    Option.some({
        dom: {
          tag: 'div',
          classes: ['tox-selectfield__icon-js'],
          innerHtml: Icons.get('chevron-down', providersBackstage.icons)
        }
      });

  const selectWrap: SimpleSpec = {
    dom: {
      tag: 'div',
      classes: ['tox-selectfield']
    },
    components: Arr.flatten([[pField], chevron.toArray()])
  };

  return AlloyFormField.sketch({
    dom: {
      tag: 'div',
      classes: ['tox-form__group']
    },
    components: Arr.flatten<AlloySpec>([pLabel.toArray(), [selectWrap]])
  });
};

const renderCommonChoice = <T>(spec: CommonCollectionItemSpec, structure: ItemStructure, itemResponse: ItemResponse): AlloySpec => {

  return Button.sketch({
    dom: structure.dom,
    components: componentRenderPipeline(structure.optComponents),
    eventOrder: menuItemEventOrder,
    buttonBehaviours: Behaviour.derive(
      [
        AddEventsBehaviour.config('item-events', [
          AlloyEvents.run(NativeEvents.mouseover(), Focusing.focus)
        ]),
        DisablingConfigs.item(spec.disabled)
      ]
    ),
    action: spec.onAction
  });
};

const initCommonEvents = (fireApiEvent: <E extends CustomEvent>(name: string, f: Function) => any, extras: ExtraListeners) => {
  return [
    // When focus moves onto a tab-placeholder, skip to the next thing in the tab sequence
    AlloyEvents.runWithTarget(NativeEvents.focusin(), NavigableObject.onFocus),

    // TODO: Test if disabled first.
    fireApiEvent<FormCloseEvent>(formCloseEvent, (api, spec) => {
      extras.onClose();
      spec.onClose();
    }),

    // TODO: Test if disabled first.
    fireApiEvent<FormCancelEvent>(formCancelEvent, (api, spec, _event, self) => {
      spec.onCancel(api);
      AlloyTriggers.emit(self, formCloseEvent);
    }),

    AlloyEvents.run<FormUnblockEvent>(formUnblockEvent, (c, se) => extras.onUnblock()),

    AlloyEvents.run<FormBlockEvent>(formBlockEvent, (c, se) => extras.onBlock(se.event()))
  ];
};

    Form.sketch(function (parts) {
      return {
        dom: UiDomFactory.dom('<div class="${prefix}-serialised-dialog"></div>'),
        components: [
          Container.sketch({
            dom: UiDomFactory.dom('<div class="${prefix}-serialised-dialog-chain" style="left: 0px; position: absolute;"></div>'),
            components: Arr.map(spec.fields, function (field, i) {
              return i <= spec.maxFieldIndex ? Container.sketch({
                dom: UiDomFactory.dom('<div class="${prefix}-serialised-dialog-screen"></div>'),
                components: [
                  navigationButton(-1, 'previous', (i > 0)),
                  parts.field(field.name, field.spec),
                  navigationButton(+1, 'next', (i < spec.maxFieldIndex))
                ]
              }) : parts.field(field.name, field.spec);
            })
          })
        ],

        formBehaviours: Behaviour.derive([
          Receivers.orientation(function (dialog, message) {
            reposition(dialog, message);
          }),
          Keying.config({
            mode: 'special',
            focusIn (dialog/*, specialInfo */) {
              focusInput(dialog);
            },
            onTab (dialog/*, specialInfo */) {
              navigate(dialog, +1);
              return Option.some(true);
            },
            onShiftTab (dialog/*, specialInfo */) {
              navigate(dialog, -1);
              return Option.some(true);
            }
          }),

          AddEventsBehaviour.config(formAdhocEvents, [
            AlloyEvents.runOnAttached(function (dialog, simulatedEvent) {
              // Reset state to first screen.
              resetState();
              const dotitems = memDots.get(dialog);
              Highlighting.highlightFirst(dotitems);
              spec.getInitialValue(dialog).each(function (v) {
                Representing.setValue(dialog, v);
              });
            }),

            AlloyEvents.runOnExecute(spec.onExecute),

            AlloyEvents.run(NativeEvents.transitionend(), function (dialog, simulatedEvent) {
              const event = simulatedEvent.event() as any;
              if (event.raw().propertyName === 'left') {
                focusInput(dialog);
              }
            }),

            AlloyEvents.run(navigateEvent, function (dialog, simulatedEvent) {
              const event = simulatedEvent.event() as any;
              const direction = event.direction();
              navigate(dialog, direction);
            })
          ])
        ])
      };
    })