import { match } from "@reach/router/lib/utils"
import stripPrefix from "./strip-prefix"
import normalizePagePath from "./normalize-page-path"

let matchPaths = []

const trimPathname = rawPathname => {
  let pathname = decodeURIComponent(rawPathname)
  // Remove the pathPrefix from the pathname.
  let trimmedPathname = stripPrefix(pathname, __BASE_PATH__)
    // Remove any hashfragment
    .split(`#`)[0]
    // Remove search query
    .split(`?`)[0]

  return trimmedPathname
}

/**
 * Set list of matchPaths
 *
 * @param {Array<{path: string, matchPath: string}>} value collection of matchPaths
 */
export const setMatchPaths = value => {
  matchPaths = value
}

/**
 * Return a matchpath url
 * if `match-paths.json` contains `{ "/foo*": "/page1", ...}`, then
 * `/foo?bar=far` => `/page1`
 *
 * @param {string} rawPathname A raw pathname
 * @return {string|null}
 */
export const findMatchPath = rawPathname => {
  const trimmedPathname = cleanPath(rawPathname)

  for (const { matchPath, path } of matchPaths) {
    if (match(matchPath, trimmedPathname)) {
      return normalizePagePath(path)
    }
  }

  return null
}

/**
 * Clean a url and converts /index.html => /
 * E.g `/foo?bar=far` => `/foo`
 *
 * @param {string} rawPathname A raw pathname
 * @return {string}
 */
export const cleanPath = rawPathname => {
  const trimmedPathname = trimPathname(rawPathname)

  let foundPath = trimmedPathname
  if (foundPath === `/index.html`) {
    foundPath = `/`
  }

  foundPath = normalizePagePath(foundPath)

  return foundPath
}