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const plugin = require('tailwindcss/plugin')
const merge = require('lodash/merge')
const castArray = require('lodash/castArray')
const styles = require('./styles')

const computed = {
  // Reserved for future "magic properties", for example:
  // bulletColor: (color) => ({ 'ul > li::before': { backgroundColor: color } }),
}

function configToCss(config) {
  return merge(
    ...Object.keys(config)
      .filter((key) => computed[key])
      .map((key) => computed[key](config[key])),
    ...castArray(config.css || {})
  )
}

module.exports = plugin.withOptions(
  ({ modifiers = ['sm', 'lg', 'xl', '2xl'] } = {}) => {
    return function ({ addComponents, theme, variants }) {
      const config = theme('typography', {})

      addComponents(
        [
          {
            '.prose': merge(...castArray(styles.default.css), configToCss(config.default || {})),
          },
          ...modifiers.map((modifier) => ({
            [`.prose-${modifier}`]: merge(
              ...castArray(styles[modifier].css),
              configToCss(config[modifier] || {})
            ),
          })),
          ...Object.keys(config)
            .filter((key) => !['default', ...modifiers].includes(key))
            .map((modifier) => ({
              [`.prose-${modifier}`]: configToCss(config[modifier]),
            })),
        ],
        variants('typography')
      )
    }
  },
  () => ({ variants: { typography: ['responsive'] } })
)