const fs = require('fs')
const Handlebars = require('handlebars')

module.exports = (defaults, templatesPath, destinationPath) => {
  if (defaults.categories !== undefined) {
    const pageTemplate = fs.readFileSync(`${templatesPath}/page.md.handlebars`, 'utf8')
    const renderPage = Handlebars.compile(pageTemplate)
    defaults.categories.forEach(({ folder, name, keys }) => {
      if (keys === undefined) { return }

      keys.forEach(({ domain, ...page }) => {
        fs.mkdirSync(`${destinationPath}/${folder}/${page.key}`)
        const pageReadmeContent = renderPage({ ...page, name, domain })
        fs.writeFileSync(`${destinationPath}/${folder}/${page.key}/readme.md`, pageReadmeContent)

        page.examples.forEach(example => {
          if (example.image !== undefined) {
            fs.copyFileSync(`../../images/${folder}/${page.key}/${example.image.filename}`, `${destinationPath}/${folder}/${page.key}/${example.image.filename}`)
          }
          if (example.video !== undefined) {
            fs.copyFileSync(`../../images/${folder}/${page.key}/${example.video.filename}`, `${destinationPath}/${folder}/${page.key}/${example.video.filename}`)
          }
        })
      })
    })
  }
}