import type { RouteOptions } from '../frog-base.js'
import type { Env } from '../types/env.js'
import type { MiddlewareHandler } from '../types/routes.js'

export function getRouteParameters<env extends Env, handler>(
  ...parameters: any[]
): [string, MiddlewareHandler<env>[], handler, RouteOptions] {
  const options: RouteOptions | undefined =
    typeof parameters[parameters.length - 1] === 'object'
      ? parameters[parameters.length - 1]
      : undefined

  const middlewares = [] as MiddlewareHandler<env>[]
  let handler: handler | undefined
  for (let i = parameters.length - (options ? 2 : 1); i > 0; i--) {
    if (!handler) handler = parameters[i]
    else middlewares.push(parameters[i])
  }

  return [parameters[0], middlewares, handler!, options ?? {}]
}