import { Categories, Category } from 'types/category'
import categoriesData from './../assets/categories/categories.json'

const flattenCategories = (
  categories: (Category | string)[],
  parentPath: string[] = []
): Categories[] => {
  return categories.flatMap<Categories, Category | string>((cat) => {
    if (typeof cat === 'string') {
      const path = [...parentPath, cat]
      const hierarchy = path.join(' > ')
      return [{ name: cat, hierarchy, l: path }]
    } else {
      const path = [...parentPath, cat.name]
      const hierarchy = path.join(' > ')
      if (cat.sub) {
        const obj: Categories = { name: cat.name, hierarchy, l: path }
        return [obj].concat(flattenCategories(cat.sub, path))
      }
      return [{ name: cat.name, hierarchy, l: path }]
    }
  })
}

export const getCategories = () => {
  return flattenCategories(categoriesData)
}