require('./Stats.css');

const React = require('react');
const PropTypes = require('prop-types');
const formatBytes = require('pretty-bytes');
const formatDate = require('date-fns/format');
const parseDate = require('date-fns/parse');
const { continents, countries } = require('countries-list');

const formatNumber = require('../utils/formatNumber');
const formatPercent = require('../utils/formatPercent');

function getCountriesByContinent(continent) {
  return Object.keys(countries).filter(
    country => countries[country].continent === continent
  );
}

function sumKeyValues(hash, keys) {
  return keys.reduce((n, key) => n + (hash[key] || 0), 0);
}

function sumValues(hash) {
  return Object.keys(hash).reduce((memo, key) => memo + hash[key], 0);
}

class Stats extends React.Component {
  static propTypes = {
    data: PropTypes.object
  };

  state = {
    minPackageRequests: 1000000,
    minCountryRequests: 1000000
  };

  render() {
    const { data } = this.props;

    if (data == null) return null;

    const totals = data.totals;

    // Summary data
    const since = parseDate(totals.since);
    const until = parseDate(totals.until);

    // Packages
    const packageRows = [];

    Object.keys(totals.requests.package)
      .sort((a, b) => {
        return totals.requests.package[b] - totals.requests.package[a];
      })
      .forEach(packageName => {
        const requests = totals.requests.package[packageName];
        const bandwidth = totals.bandwidth.package[packageName];

        if (requests >= this.state.minPackageRequests) {
          packageRows.push(
            <tr key={packageName}>
              <td>
                <a
                  href={`https://npmjs.org/package/${packageName}`}
                  title={`${packageName} on npm`}
                >
                  {packageName}
                </a>
              </td>
              <td>
                {formatNumber(requests)} (
                {formatPercent(requests / totals.requests.all)}
                %)
              </td>
              {bandwidth ? (
                <td>
                  {formatBytes(bandwidth)} (
                  {formatPercent(bandwidth / totals.bandwidth.all)}
                  %)
                </td>
              ) : (
                <td>-</td>
              )}
            </tr>
          );
        }
      });

    // Regions
    const regionRows = [];

    const continentsData = Object.keys(continents).reduce((memo, continent) => {
      const localCountries = getCountriesByContinent(continent);

      memo[continent] = {
        countries: localCountries,
        requests: sumKeyValues(totals.requests.country, localCountries),
        bandwidth: sumKeyValues(totals.bandwidth.country, localCountries)
      };

      return memo;
    }, {});

    const topContinents = Object.keys(continentsData).sort((a, b) => {
      return continentsData[b].requests - continentsData[a].requests;
    });

    topContinents.forEach(continent => {
      const continentName = continents[continent];
      const continentData = continentsData[continent];

      if (
        continentData.requests > this.state.minCountryRequests &&
        continentData.bandwidth !== 0
      ) {
        regionRows.push(
          <tr key={continent} className="continent-row">
            <td>
              <strong>{continentName}</strong>
            </td>
            <td>
              <strong>
                {formatNumber(continentData.requests)} (
                {formatPercent(continentData.requests / totals.requests.all)}
                %)
              </strong>
            </td>
            <td>
              <strong>
                {formatBytes(continentData.bandwidth)} (
                {formatPercent(continentData.bandwidth / totals.bandwidth.all)}
                %)
              </strong>
            </td>
          </tr>
        );

        const topCountries = continentData.countries.sort((a, b) => {
          return totals.requests.country[b] - totals.requests.country[a];
        });

        topCountries.forEach(country => {
          const countryRequests = totals.requests.country[country];
          const countryBandwidth = totals.bandwidth.country[country];

          if (countryRequests > this.state.minCountryRequests) {
            regionRows.push(
              <tr key={continent + country} className="country-row">
                <td className="country-name">{countries[country].name}</td>
                <td>
                  {formatNumber(countryRequests)} (
                  {formatPercent(countryRequests / totals.requests.all)}
                  %)
                </td>
                <td>
                  {formatBytes(countryBandwidth)} (
                  {formatPercent(countryBandwidth / totals.bandwidth.all)}
                  %)
                </td>
              </tr>
            );
          }
        });
      }
    });

    // Protocols
    const protocolRows = Object.keys(totals.requests.protocol)
      .sort((a, b) => {
        return totals.requests.protocol[b] - totals.requests.protocol[a];
      })
      .map(protocol => {
        const requests = totals.requests.protocol[protocol];

        return (
          <tr key={protocol}>
            <td>{protocol}</td>
            <td>
              {formatNumber(requests)} (
              {formatPercent(requests / sumValues(totals.requests.protocol))}
              %)
            </td>
          </tr>
        );
      });

    return (
      <div className="wrapper">
        <p>
          From <strong>{formatDate(since, 'MMM D')}</strong> to{' '}
          <strong>{formatDate(until, 'MMM D')}</strong> unpkg served{' '}
          <strong>{formatNumber(totals.requests.all)}</strong> requests and a
          total of <strong>{formatBytes(totals.bandwidth.all)}</strong> of data
          to <strong>{formatNumber(totals.uniques.all)}</strong> unique
          visitors,{' '}
          <strong>
            {formatPercent(totals.requests.cached / totals.requests.all, 0)}%
          </strong>{' '}
          of which were served from the cache.
        </p>

        <h3>Packages</h3>

        <p>
          The table below shows the most popular packages served by unpkg from{' '}
          <strong>{formatDate(since, 'MMM D')}</strong> to{' '}
          <strong>{formatDate(until, 'MMM D')}</strong>. Only the top{' '}
          {Object.keys(totals.requests.package).length} packages are shown.
        </p>

        <p className="table-filter">
          Include only packages that received at least{' '}
          <select
            value={this.state.minPackageRequests}
            onChange={event =>
              this.setState({
                minPackageRequests: parseInt(event.target.value, 10)
              })
            }
          >
            <option value="0">0</option>
            <option value="1000">1,000</option>
            <option value="10000">10,000</option>
            <option value="100000">100,000</option>
            <option value="1000000">1,000,000</option>
            <option value="10000000">10,000,000</option>
          </select>{' '}
          requests.
        </p>

        <table cellSpacing="0" cellPadding="0" style={{ width: '100%' }}>
          <thead>
            <tr>
              <th>
                <strong>Package</strong>
              </th>
              <th>
                <strong>Requests (% of total)</strong>
              </th>
              <th>
                <strong>Bandwidth (% of total)</strong>
              </th>
            </tr>
          </thead>
          <tbody>{packageRows}</tbody>
        </table>

        <h3>Regions</h3>

        <p>
          The table below breaks down requests to unpkg from{' '}
          <strong>{formatDate(since, 'MMM D')}</strong> to{' '}
          <strong>{formatDate(until, 'MMM D')}</strong> by geographic region.
        </p>

        <p className="table-filter">
          Include only countries that made at least{' '}
          <select
            value={this.state.minCountryRequests}
            onChange={event =>
              this.setState({
                minCountryRequests: parseInt(event.target.value, 10)
              })
            }
          >
            <option value="0">0</option>
            <option value="100000">100,000</option>
            <option value="1000000">1,000,000</option>
            <option value="10000000">10,000,000</option>
            <option value="100000000">100,000,000</option>
          </select>{' '}
          requests.
        </p>

        <table
          cellSpacing="0"
          cellPadding="0"
          style={{ width: '100%' }}
          className="regions-table"
        >
          <thead>
            <tr>
              <th>
                <strong>Region</strong>
              </th>
              <th>
                <strong>Requests (% of total)</strong>
              </th>
              <th>
                <strong>Bandwidth (% of total)</strong>
              </th>
            </tr>
          </thead>
          <tbody>{regionRows}</tbody>
        </table>

        <h3>Protocols</h3>

        <p>
          The table below breaks down requests to unpkg from{' '}
          <strong>{formatDate(since, 'MMM D')}</strong> to{' '}
          <strong>{formatDate(until, 'MMM D')}</strong> by HTTP protocol.
        </p>

        <table cellSpacing="0" cellPadding="0" style={{ width: '100%' }}>
          <thead>
            <tr>
              <th>
                <strong>Protocol</strong>
              </th>
              <th>
                <strong>Requests (% of total)</strong>
              </th>
            </tr>
          </thead>
          <tbody>{protocolRows}</tbody>
        </table>
      </div>
    );
  }
}

module.exports = Stats;