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>();

    const status =
      exception instanceof HttpException
        ? exception.getStatus()
        : HttpStatus.INTERNAL_SERVER_ERROR;

    const message =
      exception instanceof HttpException
        ? (exception.getResponse() as { message?: string | string[] }).message ?? exception.message
        : exception instanceof Error
          ? exception.message
          : 'Internal server error';

    this.logger.error(
      `${request.method} ${request.url} ${status} - ${JSON.stringify(message)}`,
    );

    response.status(status).json({
      data: null,
      message: Array.isArray(message) ? message[0] : message,
      code: status,
    });
  }
}