index.js

/**
* Return the manifest that belongs to a certain window.
* @param {object} state
* @param {String} windowId
* @return {object}
*/
export function getWindowManifest(state, windowId) {
  return state.windows[windowId]
    && state.windows[windowId].manifestId
    && state.manifests[state.windows[windowId].manifestId];
}

/**
* Return the logo of a manifest or null
* @param {object} manifest
* @return {String|null}
*/
export function getManifestLogo(manifest) {
  return manifest.manifestation
    && manifest.manifestation.getLogo();
}

/**
* Return the logo of a manifest or null
* @param {object} manifest
* @return {String|null}
*/
export function getManifestCanvases(manifest) {
  if (!manifest.manifestation) {
    return [];
  }

  return manifest.manifestation.getSequences()[0].getCanvases();
}

/**
* Return the current canvas selected in a window
* @param {object} state
* @param {String} windowId
* @return {Object}
*/
export function getSelectedCanvas(state, windowId) {
  const manifest = getWindowManifest(state, windowId);
  const { canvasIndex } = state.windows[windowId];

  if (!manifest.manifestation) {
    return {};
  }

  return manifest.manifestation.getSequences()[0].getCanvasByIndex(canvasIndex);
}


/** Return position of thumbnail navigation in a certain window.
* @param {object} state
* @param {String} windowId
* @param {String}
*/
export function getThumbnailNavigationPosition(state, windowId) {
  return state.windows[windowId]
    && state.windows[windowId].thumbnailNavigationPosition;
}

/**
* Return manifest title
* @param {object} manifest
* @return {String}
*/
export function getManifestTitle(manifest) {
  return manifest
    && manifest.manifestation
    && manifest.manifestation.getLabel().map(label => label.value)[0];
}

/** Return type of view in a certain window.
* @param {object} state
* @param {String} windowId
* @param {String}
*/
export function getWindowViewType(state, windowId) {
  return state.windows[windowId] && state.windows[windowId].view;
}

/**
* Return manifest description
* @param {object} manifest
* @return {String}
*/
export function getManifestDescription(manifest) {
  return manifest
    && manifest.manifestation
    && manifest.manifestation.getDescription().map(label => label.value)[0];
}

/**
* Return canvas label, or alternatively return the given index + 1 to be displayed
* @param {object} canvas
* @return {String|Integer}
*/
export function getCanvasLabel(canvas, canvasIndex) {
  return (canvas
    && canvas.getLabel()
    && canvas.getLabel().map(label => label.value)[0])
    || (canvasIndex || 0) + 1;
}

/**
* Return canvas metadata in a label / value structure
* This is a potential seam for pulling the i18n locale from
* state and plucking out the appropriate language.
* For now we're just getting the first.
* @param {object} IIIF Resource
* @return {Array[Object]}
*/
export function getDestructuredMetadata(iiifResoruce) {
  return (iiifResoruce
    && iiifResoruce.getMetadata()
    && iiifResoruce.getMetadata().map(resource => ({
      label: resource.label[0].value,
      value: resource.value[0].value,
    }))
  );
}