/**
 * Generate the FAVICON files = require(a PNG images.
 */
export default class FaviconGenerator {
  /**
   * Generate a FAVICON image files (ICO and PNG) from the PNG images.
   *
   * @param {ImageInfo[]} images File information for the PNG files generation.
   * @param {String} dir Output destination the path of directory.
   * @param {Logger} logger Logger.
   *
   * @return {Promise} Promise object.
   */
  static generate (images, dir, logger) {
    const results = []
    return Promise
      .resolve()
      .then(() => {
        return FaviconGenerator._generateICO(images, dir, logger)
      })
      .then((icoFile) => {
        results.push(icoFile)
        return FaviconGenerator._generatePNG(images, dir, logger)
      })
      .then((pngFiles) => {
        return results.concat(pngFiles)
      })
  }
}