import fs from 'node:fs/promises'
import { useDocument } from '@terrace/js'
import { createFileReader } from '@terrace/js/readers/node-readline'

function useHelpers({ next, level, head, tail }) {

  async function kvObject(handleValue) {
    const object = {}
    const rootLevel = level()
    while (await next(rootLevel)) {
      if (!head()) continue
      object[head()] = handleValue ? await handleValue(level()) : tail().trim()
    }
    return object
  }

  return { kvObject }
}

async function buildPackage() {
  const { next, level, head, tail, match } = useDocument(createFileReader('./repo/package.tce'))
  const { kvObject } = useHelpers({ next, level, head, tail })

  const pkg = {}

  while (await next()) {
    if (match('name')) pkg.name = tail().trim()
    if (match('version')) pkg.version = tail().trim()
    if (match('license')) pkg.license = tail().trim()
    if (match('type')) pkg.type = tail().trim()
    if (match('private')) pkg.private = tail().trim() === 'true'

    if (match('scripts')) pkg.scripts = await kvObject()
    if (match('devDependencies')) pkg.devDependencies = await kvObject()
  }

  await fs.writeFile('./package.json', JSON.stringify(pkg, null, '  '))
}

async function buildTurbo() {
  const { next, level, head, tail, match } = useDocument(createFileReader('./repo/turbo.tce'))
  const { kvObject } = useHelpers({ next, level, head, tail })

  const turbo = {}

  while (await next()) {
    if (match('#schema')) turbo['$schema'] = tail().trim()
    if (match('pipeline')) turbo.pipeline = await (async () => {
      const pipeline = {}
      const rootLevel = level()
      while (await next(rootLevel)) {
        if (!head()) continue

        const entry = pipeline[head()] = {}
        const pipelineLevel = level()
        while(await next(pipelineLevel)) {
          if (match('dependsOn')) entry.dependsOn = tail().trim().split(' ')
          if (match('outputs')) entry.outputs = tail().trim().split(' ')
        }
      }
      return pipeline
    })()
  }

  await fs.writeFile('./turbo.json', JSON.stringify(turbo, null, '  '))
}

buildPackage()
buildTurbo()