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

Handlebars.registerHelper('renderJsonCategories', (categories) => {
  const renderJsonPagesArray = (folder, keys) =>
    keys.map(({ key }) => `"${folder}/${key}"`).join(', ')

  const defaultsCategories = '"Home": ["index"]'
  if (categories === null) {
    return defaultsCategories
  }

  return [
    defaultsCategories,
    ...categories.map(
      ({ folder, name, keys }) =>
        `"${name}": [${renderJsonPagesArray(folder, keys)}]`
    ),
  ].join(',\n    ')
})

module.exports = (defaults, templatesPath, destinationPath) => {
  fs.mkdirSync(`${destinationPath}/website`)
  fs.mkdirSync(`${destinationPath}/website/core`)
  fs.mkdirSync(`${destinationPath}/website/i18n`)
  fs.mkdirSync(`${destinationPath}/website/static`)
  fs.mkdirSync(`${destinationPath}/website/static/img`)

  fs.copyFileSync(
    `${templatesPath}/website/package.json`,
    `${destinationPath}/website/package.json`
  )
  fs.copyFileSync(
    `${templatesPath}/website/yarn.lock`,
    `${destinationPath}/website/yarn.lock`
  )
  fs.copyFileSync(
    `${templatesPath}/website/siteConfig.js`,
    `${destinationPath}/website/siteConfig.js`
  )
  fs.copyFileSync(
    `${templatesPath}/website/core/Footer.js`,
    `${destinationPath}/website/core/Footer.js`
  )
  fs.copyFileSync(
    `${templatesPath}/website/static/index.html`,
    `${destinationPath}/website/static/index.html`
  )
  fs.copyFileSync(
    `${templatesPath}/website/static/img/docusaurus.svg`,
    `${destinationPath}/website/static/img/docusaurus.svg`
  )
  fs.copyFileSync(
    `${templatesPath}/website/static/img/favicon.ico`,
    `${destinationPath}/website/static/img/favicon.ico`
  )

  const sidebarsConfig = fs.readFileSync(
    `${templatesPath}/website/sidebars.json.handlebars`,
    'utf8'
  )
  const sidebarsConfigContent = Handlebars.compile(sidebarsConfig)(defaults)
  fs.writeFileSync(
    `${destinationPath}/website/sidebars.json`,
    JSON.parse(JSON.stringify(sidebarsConfigContent))
  )
}