import React from 'react';
import { Link } from 'react-router-dom'

import * as storage from '../../util/storage'
import Bar from '../bar'
import numberFormatter from '../../util/number-formatter'
import * as api from '../../api'

const MOBILE_UPPER_WIDTH = 767
const DEFAULT_WIDTH = 1080
const BREAKDOWN_LIMIT = 100

// https://stackoverflow.com/a/43467144
function isValidHttpUrl(string) {
  let url;

  try {
    url = new URL(string);
  } catch (_) {
    return false;
  }

  return url.protocol === "http:" || url.protocol === "https:";
}

export default class PropertyBreakdown extends React.Component {
  constructor(props) {
    super(props)
    let propKey = props.goal.prop_names[0]
    this.storageKey = 'goalPropTab__' + props.site.domain + props.goal.name
    const storedKey = storage.getItem(this.storageKey)
    if (props.goal.prop_names.includes(storedKey)) {
      propKey = storedKey
    }
    if (props.query.filters['props']) {
      propKey = Object.keys(props.query.filters['props'])[0]
    }

    this.state = {
      loading: true,
      propKey: propKey,
      viewport: DEFAULT_WIDTH,
      breakdown: [],
      page: 1,
      moreResultsAvailable: false
    }

    this.handleResize = this.handleResize.bind(this);
    this.fetch = this.fetch.bind(this)
    this.fetchAndReplace = this.fetchAndReplace.bind(this)
    this.fetchAndConcat = this.fetchAndConcat.bind(this)
  }

  componentDidMount() {
    window.addEventListener('resize', this.handleResize, false);

    this.handleResize();
    this.fetchAndReplace()

    if (this.props.query.period === 'realtime') {
      document.addEventListener('tick', this.fetchAndReplace)
    }
  }

  componentWillUnmount() {
    window.removeEventListener('resize', this.handleResize, false);
    document.removeEventListener('tick', this.fetchAndReplace)
  }

  handleResize() {
    this.setState({ viewport: window.innerWidth });
  }

  getBarMaxWidth() {
    const { viewport } = this.state;
    return viewport > MOBILE_UPPER_WIDTH ? "16rem" : "10rem";
  }

  fetch({concat}) {
    if (!this.props.query.filters['goal']) return

    api.get(`/api/stats/${encodeURIComponent(this.props.site.domain)}/property/${encodeURIComponent(this.state.propKey)}`, this.props.query, {limit: BREAKDOWN_LIMIT, page: this.state.page})
      .then((res) => {
        let breakdown = concat ? this.state.breakdown.concat(res) : res

        this.setState(() => ({
          loading: false,
          breakdown: breakdown,
          moreResultsAvailable: res.length >= BREAKDOWN_LIMIT
        }))
      })
  }

  fetchAndReplace() {
    this.fetch({concat: false})
  }

  fetchAndConcat() {
    this.fetch({concat: true})
  }

  loadMore() {
    this.setState({loading: true, page: this.state.page + 1}, this.fetchAndConcat.bind(this))
  }

  renderUrl(value) {
    if (isValidHttpUrl(value.name)) {
      return (
        <a target="_blank" href={value.name} rel="noreferrer" className="hidden group-hover:block">
          <svg className="inline h-4 w-4 ml-1 -mt-1 text-gray-600 dark:text-gray-400" fill="currentColor" viewBox="0 0 20 20"><path d="M11 3a1 1 0 100 2h2.586l-6.293 6.293a1 1 0 101.414 1.414L15 6.414V9a1 1 0 102 0V4a1 1 0 00-1-1h-5z"></path><path d="M5 5a2 2 0 00-2 2v8a2 2 0 002 2h8a2 2 0 002-2v-3a1 1 0 10-2 0v3H5V7h3a1 1 0 000-2H5z"></path></svg>
        </a>
      )
    }
    return null
  }

  renderPropContent(value, query) {
    return (
      <span className="flex px-2 py-1.5 group dark:text-gray-300 relative z-9 break-all">
        <Link
          to={{pathname: window.location.pathname, search: query.toString()}}
          className="md:truncate hover:underline block"
        >
          { value.name }
        </Link>
        { this.renderUrl(value) }
      </span>
    )
  }

  renderPropValue(value) {
    const query = new URLSearchParams(window.location.search)
    query.set('props', JSON.stringify({[this.state.propKey]: value.name}))
    const { viewport } = this.state;

    return (
      <div className="flex items-center justify-between my-2" key={value.name}>
        <Bar
          count={value.unique_conversions}
          plot="unique_conversions"
          all={this.state.breakdown}
          bg="bg-red-50 dark:bg-gray-500 dark:bg-opacity-15"
          maxWidthDeduction={this.getBarMaxWidth()}
        >
          {this.renderPropContent(value, query)}
        </Bar>
        <div className="dark:text-gray-200">
          <span className="font-medium inline-block w-20 text-right">{numberFormatter(value.unique_conversions)}</span>
          {
            viewport > MOBILE_UPPER_WIDTH ?
            (
              <span
                className="font-medium inline-block w-20 text-right"
              >{numberFormatter(value.total_conversions)}
              </span>
            )
            : null
          }
          <span className="font-medium inline-block w-20 text-right">{numberFormatter(value.conversion_rate)}%</span>
        </div>
      </div>
    )
  }

  changePropKey(newKey) {
    storage.setItem(this.storageKey, newKey)
    this.setState({propKey: newKey, loading: true, breakdown: [], page: 1, moreResultsAvailable: false}, this.fetchAndReplace)
  }

  renderLoading() {
    if (this.state.loading) {
      return <div className="px-4 py-2"><div className="loading sm mx-auto"><div></div></div></div>
    } else if (this.state.moreResultsAvailable && this.props.query.period !== 'realtime') {
      return (
        <div className="w-full text-center my-4">
          <button onClick={this.loadMore.bind(this)} type="button" className="button">
            Load more
          </button>
        </div>
      )
    }
  }

  renderBody() {
    return this.state.breakdown.map((propValue) => this.renderPropValue(propValue))
  }

  renderPill(key) {
    const isActive = this.state.propKey === key

    if (isActive) {
      return <li key={key} className="inline-block h-5 text-indigo-700 dark:text-indigo-500 font-bold mr-2 active-prop-heading">{key}</li>
    } else {
      return <li key={key} className="hover:text-indigo-600 cursor-pointer mr-2" onClick={this.changePropKey.bind(this, key)}>{key}</li>
    }
  }

  render() {
    return (
      <div className="w-full pl-3 sm:pl-6 mt-4">
        <div className="flex-col sm:flex-row flex items-center pb-1">
          <span className="text-xs font-bold text-gray-600 dark:text-gray-300 self-start sm:self-auto mb-1 sm:mb-0">Breakdown by:</span>
          <ul className="flex flex-wrap font-medium text-xs text-gray-500 dark:text-gray-400 leading-5 pl-1 sm:pl-2">
            { this.props.goal.prop_names.map(this.renderPill.bind(this)) }
          </ul>
        </div>
        { this.renderBody() }
        { this.renderLoading()}
      </div>
    )
  }
}