import type { FunRouterOptions } from "../../options.ts";
import validator from "./validator.ts";

export default (o?: FunRouterOptions<any>) =>
(routes: string[][]) =>
(position: number[]) =>
(an: number[]) =>
(start: number) =>
(notFound: number) =>
  o && o.stateFlags && o.stateFlags.isWild
    ? (
      (nar: [string, number][]) =>
        (new Function(`return s=>${
          nar.reduceRight(
            (acc, v) =>
              `s.indexOf("${(v[0] as string)}")===0?${
                (v[1] as number) + start
              }:` + acc,
            String(notFound),
          )
        }`))() as (s: string) => number
    )(
      routes
        .flatMap((x) => x)
        .map((x, i) => [x, i] as [string, number])
        .sort((a, b) => b[0].length - a[0].length),
    )
    : ((n) =>
      new Function(`return (s =>${
        Array.from(
          {
            length: n + 1,
          },
          (
            _,
            i,
          ) => [
            `(a${i}=>(a${i}===0?${
              an.includes(i + 1)
                ? validator(o)(position[an.indexOf(i + 1)] + start)(notFound)(
                  routes[an.indexOf(i + 1)],
                )
                : notFound
            }:${i === n ? notFound : ""}`,
            `))(s.indexOf("/"${i !== 0 ? `,a${i - 1}` : ", 1"}) + 1)`,
          ],
        ).reverse().reduce((acc, v) => v[0] + acc + v[1], "")
      })`)() as (s: string) => number)(
        an.reduce((acc, y) => y > acc ? y : acc, 0),
      );