@blockv/sdk/face/FaceSelection.js

Allows web apps to display and interact with vatoms.

//
//  BlockV AG. Copyright (c) 2018, all rights reserved.
//
//  Licensed under the BlockV SDK License (the "License"); you may not use this file or
//  the BlockV SDK except in compliance with the License accompanying it. Unless
//  required by applicable law or agreed to in writing, the BlockV SDK distributed under
//  the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
//  ANY KIND, either express or implied. See the License for the specific language
//  governing permissions and limitations under the License.
//
/* eslint-disable no-use-before-define */

export default {
  Icon: vatom => start(vatom, 'icon'),
  Engaged: vatom => start(vatom, 'engaged') || start(vatom, 'icon'),
  Fullscreen: vatom => start(vatom, 'fullscreen'),
  Card: vatom => start(vatom, 'card')
}

function start (vatom, viewmode) {
  // get the faces & vatoms array
  // create a best face array
  const bf = []
  // define what is native
  const native = 'web'
  const farray = vatom.faces
  // loop through the faces
  // eslint-disable-next-line
    for(let face of farray) {
    // set base rating
    let rate = 0
    // set default viewmode
    // const viewmode = this.viewMode.toLowerCase() || 'icon';
    // create a rating switch
    switch (face.properties.constraints.platform) {
      case native:
        rate += 2
        break
      case 'generic':
        rate += 1
        break
      default:
        rate -= 1
        break
    }

    // additional rating bonus
    if (face.properties.constraints.view_mode === 'engaged' && viewmode === 'engaged') {
      rate += 10
    } else if (face.properties.constraints.view_mode === viewmode) {
      rate += 2
    } else if (face.properties.constraints.view_mode === 'icon') {
      rate += 0
    } else {
      rate -= 1
    }

    // filter out non-rated items or items that are not benificial for our platform
    if (rate >= 0) {
      bf.push({ face, rate })
    }
  }
  // return the best face available
  // eslint-disable-next-line
  let best = bf.reduce((max, p) => p.rate > max.rate ? p : max, bf[0])
  return best && best.face
}