<!--
  - Copyright 2014-2018 the original author or authors.
  -
  - Licensed under the Apache License, Version 2.0 (the "License");
  - you may not use this file except in compliance with the License.
  - You may obtain a copy of the License at
  -
  -     http://www.apache.org/licenses/LICENSE-2.0
  -
  - Unless required by applicable law or agreed to in writing, software
  - distributed under the License is distributed on an "AS IS" BASIS,
  - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  - See the License for the specific language governing permissions and
  - limitations under the License.
  -->

<template>
    <div>
        <details-datasource v-for="dataSource in dataSources" :key="dataSource"
                            :instance="instance" :data-source="dataSource"></details-datasource>
    </div>
</template>

<script>
  import subscribing from '@/mixins/subscribing';
  import {Observable} from '@/utils/rxjs';
  import detailsDatasource from './details-datasource';

  export default {
    props: ['instance', 'type'],
    mixins: [subscribing],
    components: {detailsDatasource},
    data: () => ({
      dataSources: [],
    }),
    watch: {
      instance() {
        this.subscribe();
      }
    },
    methods: {
      async fetchDataSources() {
        if (this.instance) {
          try {
            const response = await this.instance.fetchMetric('data.source.active.connections');
            return response.data.availableTags.filter(tag => tag.tag === 'name')[0].values;
          } catch (error) {
            return [];
          }
        }
      },
      createSubscription() {
        const vm = this;
        if (this.instance) {
          return Observable.timer(0, 2500)
            .concatMap(this.fetchDataSources)
            .subscribe({
              next: names => {
                vm.dataSources = names
              },
              errors: err => {
                vm.unsubscribe();
              }
            });
        }
      }
    }
  }
</script>
