import _ from 'lodash';
import { DataQuery, dateMath } from '@grafana/data';
import * as utils from '../datasource/utils';
import { ProblemDTO } from 'datasource/types';

export function isNewProblem(problem: ProblemDTO, highlightNewerThan: string): boolean {
  try {
    const highlightIntervalMs = utils.parseInterval(highlightNewerThan);
    const durationSec = Date.now() - problem.timestamp * 1000;
    return durationSec < highlightIntervalMs;
  } catch (e) {
    return false;
  }
}

const DEFAULT_TIME_FORMAT = 'DD MMM YYYY HH:mm:ss';

export function formatLastChange(lastchangeUnix: number, customFormat?: string) {
  const date = new Date(lastchangeUnix * 1000);
  const timestamp = dateMath.parse(date);
  const format = customFormat || DEFAULT_TIME_FORMAT;
  const lastchange = timestamp!.format(format);
  return lastchange;
}

export const getNextRefIdChar = (queries: DataQuery[]): string => {
  const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  const nextLetter = _.find(letters, (refId) => {
    return _.every(queries, (other) => {
      return other.refId !== refId;
    });
  });
  return nextLetter || 'A';
};