/**
 * Simple Zod Validation Pipe for NestJS
 * Just uses Zod as-is with clean error formatting
 */

import { PipeTransform, Injectable, BadRequestException } from '@nestjs/common';
import type { ArgumentMetadata } from '@nestjs/common';
import type { ZodSchema } from 'zod';
import { ZodError } from 'zod';

@Injectable()
export class ZodValidationPipe implements PipeTransform {
  constructor(private schema: ZodSchema) {}

  transform(value: unknown, metadata: ArgumentMetadata) {
    try {
      return this.schema.parse(value);
    } catch (error) {
      if (error instanceof ZodError) {
        const errors = error.issues.map(issue => ({
          field: issue.path.join('.') || 'root',
          message: issue.message,
          code: issue.code
        }));
        
        throw new BadRequestException({
          message: 'Validation failed',
          errors,
          statusCode: 400
        });
      }
      throw new BadRequestException('Validation failed');
    }
  }
}

/**
 * Factory function to create Zod pipe (main export)
 */
export const ZodPipe = (schema: ZodSchema) => new ZodValidationPipe(schema);

/**
 * Alternative factory function
 */
export const createZodPipe = (schema: ZodSchema) => new ZodValidationPipe(schema);