export enum MetaType {
  image = 'image',
  video = 'video',
  other = 'other'
}

export const metaTypeExtnames = {
  [MetaType.image]: ['bmp', 'jpg', 'png', 'tif', 'gif', 'pcx', 'tga', 'exif', 'fpx', 'svg', 'psd', 'cdr', 'pcd', 'dxf', 'ufo', 'eps', 'ai', 'raw', 'WMF', 'webp', 'avif', 'apng'],
  [MetaType.video]: ['wmv', 'asf', 'asx', 'rm', 'rmvb', 'mp4', '3gp', 'mov', 'm4v', 'avi', 'dat', 'mkv', 'flv', 'vob']
}

export const getExtname = (url: string) => {
  const index = url.lastIndexOf('.')
  if (~index) {
    return url.substring(index + 1)
  } else {
    return null
  }
}

export const getUrlType = (url: string) => {
  const extname = getExtname(url)?.toLowerCase()
  if (extname) {
    for (const [type, extnames] of Object.entries(metaTypeExtnames)) {
      if (extnames.includes(extname)) {
        return type as MetaType
      }
    }
  } else {
    return MetaType.other
  }
}