import type { MinimalElement, MinimalNode } from '@nuxt/content'

type TypedRecord<T extends readonly string[]> = Record<T[number], string>

type PlainText<T extends string[]> = {
  meta: TypedRecord<T>
  text: string
}

const extractText = (element ?: MinimalNode) : string => {
  if (!element) return ''
  if (typeof element === 'string') return element
  const [,, ...nodes] = element
  return nodes?.map((el : MinimalNode) => typeof el === 'string' ? el : extractText(el)).join(' ') ?? ''
}

export const generatePlainText = <T extends string[] = []>(body ?: MinimalNode[]) : PlainText<T>[] => {
  if (!body) return []
  return body.map<PlainText<T>>(part => {
    const [, meta] = part as MinimalElement
    return {
      meta : meta as TypedRecord<T>,
      text: extractText(part).replace(/\n/g, ' ')
    }
  })
}