import {
  ExceptionFilter,
  Catch,
  ArgumentsHost,
  HttpException,
  HttpStatus,
  Logger,
} from '@nestjs/common';
import { Request, Response } from 'express';

@Catch()
export class GlobalExceptionFilter implements ExceptionFilter {
  private readonly logger = new Logger(GlobalExceptionFilter.name);

  catch(exception: unknown, host: ArgumentsHost) {
    const ctx = host.switchToHttp();
    const response = ctx.getResponse<Response>();
    const request = ctx.getRequest<Request>();

    let status = HttpStatus.INTERNAL_SERVER_ERROR;
    let message = 'Erro interno do servidor';
    let errors: any = undefined;

    if (exception instanceof HttpException) {
      status = exception.getStatus();
      const exceptionResponse = exception.getResponse();

      if (typeof exceptionResponse === 'string') {
        message = exceptionResponse;
      } else if (typeof exceptionResponse === 'object') {
        const resp = exceptionResponse as any;
        message = resp.message || message;
        errors = Array.isArray(resp.message) ? resp.message : undefined;
        if (errors) message = 'Dados inválidos';
      }
    } else if (exception instanceof Error) {
      this.logger.error(`Unhandled error: ${exception.message}`, exception.stack);
    }

    const requestId = (request as any).requestId;

    response.status(status).json({
      statusCode: status,
      message,
      errors,
      requestId,
      timestamp: new Date().toISOString(),
      path: request.url,
    });
  }
}