import {upperCaseFirstCharacter} from '../utilities'
import type StyleDictionary from 'style-dictionary'

/**
 * camelCase
 * @scope custom camelCase implementation should only be used within `name path to dot notation` transformer
 * @description replaces space ` `, dash `-`, underscore `_` and plus `+` by camelCasing e.g. `camel-case` -> `camelCase`
 * @param string
 * @returns string
 */
const camelCase = (string: string): string => {
  return string
    .split(/[\s-_+]+/g)
    .map((stringPart: string, index: number) => (index === 0 ? stringPart : upperCaseFirstCharacter(stringPart)))
    .join('')
}
/**
 * @description converts the [TransformedToken's](https://github.com/amzn/style-dictionary/blob/main/types/TransformedToken.d.ts) `.path` array to a dot.notation string
 * @type name transformer — [StyleDictionary.NameTransform](https://github.com/amzn/style-dictionary/blob/main/types/Transform.d.ts)
 * @matcher omitted to match all tokens
 * @transformer returns `string` in dot.notation
 */
export const namePathToDotNotation: StyleDictionary.Transform = {
  type: `name`,
  transformer: (token: StyleDictionary.TransformedToken, options?: StyleDictionary.Platform): string => {
    return (
      [options?.prefix, ...token.path]
        // remove undefined if exists
        .filter((part: unknown): part is string => typeof part === 'string' && part !== '@')
        .map((part: string) => camelCase(part))
        .join('.')
    )
  },
}