import { DATA_PATH } from '../config';

import * as path from 'path';
import * as fs from 'fs';
import * as _ from 'lodash';


const API_KEYS_FILE = path.join(DATA_PATH, 'api-keys.json');
if(!fs.existsSync(API_KEYS_FILE)) {
  console.log(`${API_KEYS_FILE} doesn't exist, creating`);
  fs.writeFileSync(API_KEYS_FILE, JSON.stringify({}), 'utf8');
}

export function getApiKey(grafanaUrl: string): string | null {
  const data = fs.readFileSync(API_KEYS_FILE, 'utf8');
  const apiKey = JSON.parse(data)[grafanaUrl];
  if(_.isNil(apiKey)) {
    return null;
  }

  return apiKey;
}

export function upsertApiKey(grafanaUrl: string, apiKey: string): void {
  const data = fs.readFileSync(API_KEYS_FILE, 'utf8');
  const apiKeys = JSON.parse(data);

  apiKeys[grafanaUrl] = apiKey;

  fs.writeFileSync(API_KEYS_FILE, JSON.stringify(apiKeys), 'utf8');
}

// TODO: query Grafana API if a key exists && remove the key if it doesn't work for specified grafanaUrl
export function validateGrafanaUrl(grafanaUrl: string) {
  const host = new URL(grafanaUrl).origin;
  const apiKey = getApiKey(host);

  if (_.isNil(apiKey) || apiKey === '') {
    throw new Error(`Please configure API key for ${host}`);
  }
}