import type { NextFunction, Request, Response } from 'express';
import type { ZodTypeAny } from 'zod';

type Target = 'body' | 'query' | 'params';

export function validate(target: Target, schema: ZodTypeAny) {
  return (req: Request, _res: Response, next: NextFunction) => {
    const result = schema.safeParse(req[target]);
    if (!result.success) {
      next(result.error);
      return;
    }
    req.validated ??= {};
    req.validated[target] = result.data;
    next();
  };
}