import { Injectable, InternalServerErrorException } from '@nestjs/common';
import axios from 'axios';
import {
  PrometheusQueryResult,
  PrometheusApiResponse,
} from './interface/prometheus.interface';

@Injectable()
export class PrometheusService {
  private readonly prometheusUrl = 'http://prometheus:9090/api/v1/query';

  async getMetric(metric: string): Promise<PrometheusQueryResult> {
    try {
      const response = await axios.get<
        PrometheusApiResponse<PrometheusQueryResult>
      >(this.prometheusUrl, {
        params: { query: metric },
      });

      return response.data.data;
    } catch (error: unknown) {
      if (error instanceof Error) {
        throw new InternalServerErrorException(
          `Ошибка запроса: ${error.message}`,
        );
      }
      throw new InternalServerErrorException(
        'Неизвестная ошибка при запросе к Prometheus',
      );
    }
  }
}