import { createRequire } from 'module'

export const checkConstraints = () => {
  checkNodeVersion()
  checkContentlayerVersionsMatch()
}

const MIN_NODE_VERSION_MAJOR = 14
const MIN_NODE_VERSION_MINOR = 18

const checkNodeVersion = () => {
  const [nodeVersionMajor, nodeVersionMinor] = process.versions.node.split('.').map((_) => parseInt(_, 10)) as [
    number,
    number,
    number,
  ]

  if (
    nodeVersionMajor < MIN_NODE_VERSION_MAJOR ||
    (nodeVersionMajor === MIN_NODE_VERSION_MAJOR && nodeVersionMinor < MIN_NODE_VERSION_MINOR)
  ) {
    throw new Error(
      `Contentlayer required Node.js version >= ${MIN_NODE_VERSION_MAJOR}.${MIN_NODE_VERSION_MINOR}. (Current version: ${process.versions.node})`,
    )
  }
}

const checkContentlayerVersionsMatch = () => {
  const contentlayerVersion = getPackageVersion('contentlayer2')
  const nextContentlayerVersion = getPackageVersion('next-contentlayer2')

  if (contentlayerVersion !== nextContentlayerVersion) {
    throw new Error(
      `\
The versions of "contentlayer" and "next-contentlayer" need to be identical in your "package.json".
Currently used versions: contentlayer: "${contentlayerVersion}", next-contentlayer: "${nextContentlayerVersion}"`,
    )
  }
}

const require = createRequire(import.meta.url)

// const getPackageVersion = (packageName: string): string =>
//   JSON.parse(fs.readFileSync(require.resolve(packageName), 'utf8')).version

const getPackageVersion = (packageName: string): string => require(`${packageName}/package.json`).version