text: import { reaction, action } from 'mobx';
  
  import getContrastSensitiveStyle from '../getContrastSensitiveStyle';
  
  import style from '../ItkVtkViewer.module.css';
  
  import opacityIcon from '../icons/opacity.svg';
  
  function createGeometryOpacitySlider(
    store,
    geometryColorRow
  ) {
    const contrastSensitiveStyle = getContrastSensitiveStyle(
      ['invertibleButton'],
      store.isBackgroundDark
    );
  
    const defaultGeometryOpacity = 1.0;
  
    const sliderEntry = document.createElement('div');
    sliderEntry.setAttribute('class', style.sliderEntry);
    sliderEntry.innerHTML = `
      <div itk-vtk-tooltip itk-vtk-tooltip-bottom itk-vtk-tooltip-content="Opacity" class="${
        contrastSensitiveStyle.invertibleButton
      } ${style.gradientOpacitySlider}">
        ${opacityIcon}
      </div>
      <input type="range" min="0" max="1" value="${defaultGeometryOpacity}" step="0.01"
        id="${store.id}-geometryOpacitySlider"
        class="${style.slider}" />`;
    const opacityElement = sliderEntry.querySelector(
      `#${store.id}-geometryOpacitySlider`
    );
  
    reaction(() => {
      return store.geometriesUI.geometries.slice();
    },
      (geometries) => {
        if(!!!geometries || geometries.length === 0) {
          return;
        }
  
  
        geometries.forEach((geometry, index) => {
          if (store.geometriesUI.opacities.length <= index) {
            store.geometriesUI.opacities.push(defaultGeometryOpacity);
          }
        })
        const selectedGeometryIndex = store.geometriesUI.selectedGeometryIndex;
        opacityElement.value = store.geometriesUI.opacities[selectedGeometryIndex];
      }
    )
  
    reaction(() => {
      return store.geometriesUI.selectedGeometryIndex;
      },
      (selectedGeometryIndex) => {
        opacityElement.value = store.geometriesUI.opacities[selectedGeometryIndex];
      });
  
    reaction(() => {
      return store.geometriesUI.opacities.slice();
    },
      (opacities) => {
        opacities.forEach((opacity, index) => {
          store.geometriesUI.representationProxies[index].setOpacity(opacity);
        });
        store.renderWindow.render();
        const selectedGeometryIndex = store.geometriesUI.selectedGeometryIndex;
        opacityElement.value = opacities[selectedGeometryIndex];
      });
  
  
    opacityElement.addEventListener('input', action((event) => {
        event.preventDefault();
        event.stopPropagation();
        const selectedGeometryIndex = store.geometriesUI.selectedGeometryIndex;
        store.geometriesUI.opacities[selectedGeometryIndex] = Number(event.target.value);
      }));
  
    const defaultGeometryOpacities = new Array(store.geometriesUI.geometries.length);
    defaultGeometryOpacities.fill(defaultGeometryOpacity);
    opacityElement.value = defaultGeometryOpacity;
    store.geometriesUI.opacities = defaultGeometryOpacities;
  
    geometryColorRow.appendChild(sliderEntry);
  }
  
  export default createGeometryOpacitySlider;
  