import type {PortableTextBlock} from '@portabletext/types'

const defaults = {nonTextBehavior: 'remove'}

export default function (blocks: PortableTextBlock[] = [], opts = {}) {
  if (typeof blocks === 'string') {
    return blocks
  }

  const options = Object.assign({}, defaults, opts)
  return blocks
    .map((block) => {
      if (block._type !== 'block' || !block.children) {
        return options.nonTextBehavior === 'remove' ? '' : `[${block._type} block]`
      }

      return block.children.map((child) => child.text).join('')
    })
    .join('\n\n')
}