import { HelperOptions } from 'handlebars'
import querystring from 'querystring'

const host = 'https://images.ft.com/v3/image/raw'

const defaults = { source: 'page-kit', fit: 'scale-down' }

export default function resize(...args) {
  if (args.length !== 2) {
    throw Error('Incorrect number of parameters provided')
  }

  const options = args.pop() as HelperOptions
  const image = options.fn(this)
  const width = args[0]

  const query = querystring.stringify({ width, ...defaults, ...options.hash })

  return `${host}/${encodeURIComponent(image)}?${query}`
}