import * as plugins from '../plugins.js';
import type { S3Context } from './context.js';

export type Middleware = (
  req: plugins.http.IncomingMessage,
  res: plugins.http.ServerResponse,
  ctx: S3Context,
  next: () => Promise<void>
) => Promise<void>;

/**
 * Middleware stack for composing request handlers
 */
export class MiddlewareStack {
  private middlewares: Middleware[] = [];

  /**
   * Add middleware to the stack
   */
  public use(middleware: Middleware): void {
    this.middlewares.push(middleware);
  }

  /**
   * Execute all middlewares in order
   */
  public async execute(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context
  ): Promise<void> {
    let index = 0;

    const next = async (): Promise<void> => {
      if (index < this.middlewares.length) {
        const middleware = this.middlewares[index++];
        await middleware(req, res, ctx, next);
      }
    };

    await next();
  }
}