import { getReferences } from "./references"
import type { TokenTransformer } from "./types"

export const addCssVariables: TokenTransformer = {
  type: "extensions",
  enforce: "pre",
  name: "tokens/css-var",
  transform(token, dictionary) {
    const { prefix, formatCssVar } = dictionary
    const { negative, originalPath } = token.extensions

    const path = negative ? originalPath : token.path

    return {
      cssVar: formatCssVar(path.filter(Boolean), prefix),
    }
  },
}

export const addConditionalCssVariables: TokenTransformer = {
  enforce: "post",
  type: "value",
  name: "tokens/conditionals",
  transform(token, dictionary) {
    const { prefix, formatCssVar } = dictionary

    const refs = getReferences(token.value)
    if (!refs.length) return token.value

    refs.forEach((ref) => {
      const variable = formatCssVar(ref.split("."), prefix)
      token.value = token.value.replace(`{${variable.ref}}`, variable)
    })

    return token.value
  },
}

export const addColorPalette: TokenTransformer = {
  type: "extensions",
  enforce: "pre",
  name: "tokens/colors/colorPalette",
  match(token) {
    return token.extensions.category === "colors" && !token.extensions.virtual
  },
  transform(token, dict) {
    let path = token.path.slice()

    path.pop()
    path.shift()

    if (path.length === 0) {
      const newPath = [...token.path]
      newPath.shift()
      path = newPath
    }

    if (path.length === 0) {
      return {}
    }

    const roots = path.reduce<string[][]>((acc, _, i, arr) => {
      const next = arr.slice(0, i + 1)
      acc.push(next)
      return acc
    }, [])

    const root = path[0]

    const value = dict.formatTokenName(path)

    const keys = token.path
      .slice(token.path.indexOf(root) + 1)
      .reduce<string[][]>((acc, _, i, arr) => {
        acc.push(arr.slice(i))
        return acc
      }, [])

    if (keys.length === 0) {
      keys.push([""])
    }

    return {
      colorPalette: { value, roots, keys },
    }
  },
}

export const tokenTransforms = [
  addCssVariables,
  addConditionalCssVariables,
  addColorPalette,
]