import { useDocument } from '@terrace-lang/js/document'
import { createFileReader } from '@terrace-lang/js/readers/node-readline'
import fs from 'fs/promises'
import path from 'path'
import process from 'node:process'
import knownNodes from './index.js'

export default async function (originalDoc, rootNode, context) {
  const includePath = rootNode.tail
  const includedDoc = useDocument(createFileReader(includePath))

  const node = {
    type: rootNode.head,
    class: '',
    children: []
  }

  const root = path.dirname(context.filePath)
  const originalFilepath = context.filePath
  context.filePath = includePath

  process.chdir(path.dirname(originalFilepath))
  for await (const childNode of includedDoc) {
    if (childNode.isEmpty()) continue
    if (childNode.is('title')) context.page.title = childNode.tail
    else if (childNode.is('layout')) context.page.layout = childNode.tail
    else if (childNode.is('description')) {
      for await (const grandchild of childNode.children()) {
        context.page.description.push(grandchild.content)
      }
    }
    else if (!childNode.head) continue
    else {
      const block = childNode.head
      if (!knownNodes[block]) continue
      node.children.push(await knownNodes[block](includedDoc, childNode, context))
    }
  }

  process.chdir(path.dirname(originalFilepath))

  return node
}