/**
 * Validation Middleware
 *
 * Validates request body, query, and params using Zod schemas
 */

import { Request, Response, NextFunction } from 'express';
import { ZodSchema, ZodError } from 'zod';
import { ValidationError } from '../types';

export interface ValidateOptions {
  body?: ZodSchema;
  query?: ZodSchema;
  params?: ZodSchema;
}

/**
 * Validate request against Zod schemas
 */
export const validate = (schemas: ValidateOptions) => {
  return async (req: Request, _res: Response, next: NextFunction): Promise<void> => {
    try {
      if (schemas.body) {
        req.body = schemas.body.parse(req.body);
      }

      if (schemas.query) {
        req.query = schemas.query.parse(req.query);
      }

      if (schemas.params) {
        req.params = schemas.params.parse(req.params);
      }

      next();
    } catch (error) {
      if (error instanceof ZodError) {
        const details = error.errors.reduce(
          (acc, err) => {
            const path = err.path.join('.');
            acc[path] = err.message;
            return acc;
          },
          {} as Record<string, string>
        );

        next(new ValidationError('Datos de entrada invalidos', details));
      } else {
        next(error);
      }
    }
  };
};

/**
 * Validate only request body
 */
export const validateBody = (schema: ZodSchema) => validate({ body: schema });

/**
 * Validate only query parameters
 */
export const validateQuery = (schema: ZodSchema) => validate({ query: schema });

/**
 * Validate only path parameters
 */
export const validateParams = (schema: ZodSchema) => validate({ params: schema });

export default validate;