fathom/assets/js/components/CountWidget.js

'use strict';

import { h, render, Component } from 'preact';
import * as numbers from '../lib/numbers.js';
import Client from '../lib/client.js';
const dayInSeconds = 60 * 60 * 24;

class CountWidget extends Component {
  constructor(props) {
    super(props)

    this.state = {
      count: 0,
      previousCount: 0,
      loading: false
    }

    this.fetchData = this.fetchData.bind(this);
    this.fetchData(props.period);
  }

  componentWillReceiveProps(newProps) {
    if(this.props.period != newProps.period) {
      this.fetchData(newProps.period)
    }
  }

  fetchData(period) {
    const before = Math.round((+new Date() ) / 1000);
    const after = before - ( period * dayInSeconds );
    this.setState({ loading: true })

    Client.request(`${this.props.endpoint}/count?before=${before}&after=${after}`)
      .then((d) => { this.setState({ loading: false, count: d })})

    // query previous period
    const previousBefore = after;
    const previousAfter = previousBefore - ( period * dayInSeconds );
    Client.request(`${this.props.endpoint}/count?before=${previousBefore}&after=${previousAfter}`)
      .then((d) => { this.setState({ previousCount: d })})
  }

  renderPercentage() {
    // wait for request to finish
    if( ! this.state.previousCount ) {
      return '';
    }

    const percentage = Math.round(( this.state.count / this.state.previousCount * 100 - 100))
    return (
      <small class={percentage > 0 ? 'positive' : 'negative'}>{percentage}%</small>
    )
  }

  render() {
    const loadingOverlay = this.state.loading ? <div class="loading-overlay"><div></div></div> : '';
    return (
      <div class="block center-text">
        {loadingOverlay}
        <h4 class="">{this.props.title}</h4>
        <div class="big tiny-margin">{numbers.formatWithComma(this.state.count)} {this.renderPercentage()}</div>
      </div>
    )
  }
}

export default CountWidget