import { NextResponse } from "next/server";
import type { NextFetchEvent, NextRequest } from "next/server";
import * as plugins from "temp/middleware-plugins";

export interface MiddlewarePlugin {
  /**
   * Detect order when the plugin should be called, e.g. 0 - will be called first (can be a plugin which data is required for other plugins)
   */
  order: number;
  /**
   * A middleware to be called, it's required to return @type {NextResponse} for other middlewares
   */
  exec(
    req: NextRequest,
    res?: NextResponse,
    ev?: NextFetchEvent,
  ): Promise<NextResponse>;
}

export default async function middleware(
  req: NextRequest,
  ev: NextFetchEvent,
): Promise<NextResponse> {
  const response = NextResponse.next();

  return (Object.values(plugins) as MiddlewarePlugin[])
    .sort((p1, p2) => p1.order - p2.order)
    .reduce(
      (p, plugin) => p.then((res) => plugin.exec(req, res, ev)),
      Promise.resolve(response),
    );
}