import React from "react"
import PropTypes from "prop-types"
import formatBytes from "pretty-bytes"
import formatDate from "date-fns/format"
import parseDate from "date-fns/parse"
import formatNumber from "./utils/formatNumber"
import formatPercent from "./utils/formatPercent"

import { continents, countries } from "countries-list"

const getCountriesByContinent = continent =>
  Object.keys(countries).filter(country => countries[country].continent === continent)

const sumKeyValues = (hash, keys) => keys.reduce((n, key) => n + (hash[key] || 0), 0)

const sumValues = hash => 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>{continentName}</td>
            <td>
              {formatNumber(continentData.requests)} ({formatPercent(
                continentData.requests / totals.requests.all
              )}%)
            </td>
            <td>
              {formatBytes(continentData.bandwidth)} ({formatPercent(
                continentData.bandwidth / totals.bandwidth.all
              )}%)
            </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>Package</th>
              <th>Requests (% of total)</th>
              <th>Bandwidth (% of total)</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>Region</th>
              <th>Requests (% of total)</th>
              <th>Bandwidth (% of total)</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>Protocol</th>
              <th>Requests (% of total)</th>
            </tr>
          </thead>
          <tbody>{protocolRows}</tbody>
        </table>
      </div>
    )
  }
}

export default Stats