import { PipeTransform, Injectable, ArgumentMetadata } from '@nestjs/common';
import { ZodSchema } from 'zod';
import { ApiError } from '../errors/api-error';

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

  transform(value: any, _metadata: ArgumentMetadata): any {
    const parsed = this.schema.safeParse(value);
    if (!parsed.success) {
      const details = parsed.error.issues.map((i) => ({ path: i.path.join('.'), message: i.message }));
      throw ApiError.validation('Request validation failed', details);
    }
    return parsed.data;
  }
}