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 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 checkboxSpec = (() => {
    const memBodyPanel = Memento.record(
      renderBodyPanel({
        items: [
          { type: 'checkbox', name: 'checked', label: 'Checked' },
          { type: 'checkbox', name: 'unchecked', label: 'Unchecked' }
        ]
      }, {
        shared: sharedBackstage
      })
    );

    return {
      dom: {
        tag: 'div'
      },
      components: [
        memBodyPanel.asSpec(),
      ],
      events: AlloyEvents.derive([
        AlloyEvents.runOnAttached((component) => {
          const body = memBodyPanel.get(component);
          Representing.setValue(body, {
            checked: true,
            unchecked: false
          });
        })
      ])
    };
  })();

const renderCommonSpec = (spec, actionOpt, extraBehaviours = [], dom, components) => {
  const action = actionOpt.fold(() => {
    return {};
  }, (action) => {
    return {
      action
    };
  });

  const common = {
    buttonBehaviours: Behaviour.derive([
      DisablingConfigs.button(spec.disabled),
      Tabstopping.config({}),
      AddEventsBehaviour.config('button press', [
        AlloyEvents.preventDefault('click'),
        AlloyEvents.preventDefault('mousedown')
      ])
    ].concat(extraBehaviours)),
    eventOrder: {
      click: ['button press', 'alloy.base.behaviour'],
      mousedown: ['button press', 'alloy.base.behaviour']
    },
    ...action
  };
  const domFinal = Merger.deepMerge(common, { dom });
  return Merger.deepMerge(domFinal, { components });
};

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 renderDialog = (spec: DialogFoo) => {
  return ModalDialog.sketch(
    {
      lazySink: spec.lazySink,
      onEscape: () => {
        spec.onCancel();
        // TODO: Make a strong type for Handled KeyEvent
        return Option.some(true);
      },
      dom: {
        tag: 'div',
        classes: [ 'tox-dialog' ].concat(spec.extraClasses)
      },
      components: [
        {
          dom: {
            tag: 'div',
            classes: [ 'tox-dialog__header' ]
          },
          components: [
            spec.partSpecs.title,
            spec.partSpecs.close
          ]
        },
        spec.partSpecs.body,
        spec.partSpecs.footer
      ],
      parts: {
        blocker: {
          dom: DomFactory.fromHtml('<div class="tox-dialog-wrap"></div>'),
          components: [
            {
              dom: {
                tag: 'div',
                classes: [ 'tox-dialog-wrap__backdrop' ]
              }
            }
          ]
        }
      },
      modalBehaviours: Behaviour.derive([
        // Dupe warning.
        AddEventsBehaviour.config('basic-dialog-events', [
          AlloyEvents.run<FormCancelEvent>(formCancelEvent, (comp, se) => {
            spec.onCancel();
          }),
          AlloyEvents.run<FormSubmitEvent>(formSubmitEvent, (comp, se) => {
            spec.onSubmit();
          }),
        ])
      ])
    }
  );
};

export const createMenuFrom = (partialMenu: Partial<MenuTypes.MenuSpec>, columns: number | 'auto', focusMode: FocusMode, presets: Types.PresetTypes): MenuTypes.MenuSpec  => {
  const focusManager = focusMode === FocusMode.ContentFocus ? FocusManagers.highlights() : FocusManagers.dom();

  const movement = deriveMenuMovement(columns, presets);
  const menuMarkers = getMenuMarkers(presets);

  return {
    dom: partialMenu.dom,
    components: partialMenu.components,
    items: partialMenu.items,
    value: partialMenu.value,
    markers: {
      selectedItem: menuMarkers.selectedItem,
      item: menuMarkers.item
    },
    movement,
    fakeFocus: focusMode === FocusMode.ContentFocus,
    focusManager,

    menuBehaviours: SimpleBehaviours.unnamedEvents(columns !== 'auto' ? [ ] : [
      AlloyEvents.runOnAttached((comp, se) => {
        detectSize(comp, 4, menuMarkers.item).each(({ numColumns, numRows }) => {
          Keying.setGridSize(comp, numRows, numColumns);
        });
      })
    ])
  };
};

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 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 fireApiEvent = <E extends CustomEvent>(eventName: string, f: (api: Types.Dialog.DialogInstanceApi<T>, spec: Types.Dialog.Dialog<T>, e: E, c: AlloyComponent) => void) => {
   return AlloyEvents.run<E>(eventName, (c, se) => {
     withSpec(c, (spec, _c) => {
       f(getInstanceApi(), spec, se.event(), c);
     });
   });
 };