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

import FadeIn from '../../fade-in'
import numberFormatter from '../../number-formatter'
import Bar from '../bar'
import * as api from '../../api'
import LazyLoader from '../../lazy-loader'

export default class OperatingSystems extends React.Component {
  constructor(props) {
    super(props)
    this.state = {loading: true}
    this.onVisible = this.onVisible.bind(this)
  }

  onVisible() {
    this.fetchOperatingSystems()
    if (this.props.timer) this.props.timer.onTick(this.fetchOperatingSystems.bind(this))
  }

  componentDidUpdate(prevProps) {
    if (this.props.query !== prevProps.query) {
      this.setState({loading: true, operatingSystems: null})
      this.fetchOperatingSystems()
    }
  }

  fetchOperatingSystems() {
    if (this.props.query.filters.os) {
      api.get(`/api/stats/${encodeURIComponent(this.props.site.domain)}/operating-system-versions`, this.props.query)
        .then((res) => this.setState({loading: false, operatingSystems: res}))
    } else {
      api.get(`/api/stats/${encodeURIComponent(this.props.site.domain)}/operating-systems`, this.props.query)
        .then((res) => this.setState({loading: false, operatingSystems: res}))
    }
  }

  renderOperatingSystem(os) {
    const query = new URLSearchParams(window.location.search)
    if (this.props.query.filters.os) {
      query.set('os_version', os.name)
    } else {
      query.set('os', os.name)
    }

    return (
      <div className="flex items-center justify-between my-1 text-sm" key={os.name}>
        <div className="w-full h-8" style={{maxWidth: 'calc(100% - 6rem)'}}>
          <Bar count={os.count} all={this.state.operatingSystems} bg="bg-green-50 dark:gray-500 dark:bg-opacity-15" />
          <span className="flex px-2 dark:text-gray-300" style={{marginTop: '-26px'}}>
            <Link className="block truncate hover:underline" to={{search: query.toString()}}>
              {os.name}
            </Link>
          </span>
        </div>
        <span className="font-medium dark:text-gray-200">{numberFormatter(os.count)} <span className="inline-block w-8 text-xs text-right">({os.percentage}%)</span></span>
      </div>
    )
  }

  label() {
    return this.props.query.period === 'realtime' ? 'Current visitors' : 'Visitors'
  }

  renderList() {
    const key = this.props.query.filters.os ? this.props.query.filters.os + ' version' : 'Operating system'

    if (this.state.operatingSystems && this.state.operatingSystems.length > 0) {
      return (
        <React.Fragment>
          <div className="flex items-center justify-between mt-3 mb-2 text-xs font-bold tracking-wide text-gray-500 dark:text-gray-400">
            <span>{ key }</span>
            <span>{ this.label() }</span>
          </div>
          { this.state.operatingSystems && this.state.operatingSystems.map(this.renderOperatingSystem.bind(this)) }
        </React.Fragment>
      )
    } else {
      return <div className="font-medium text-center text-gray-500 mt-44 dark:text-gray-400">No data yet</div>
    }
  }

  render() {
    return (
      <LazyLoader onVisible={this.onVisible} className="flex flex-col flex-grow">
        { this.state.loading && <div className="mx-auto loading mt-44"><div></div></div> }
        <FadeIn show={!this.state.loading} className="flex-grow">
          { this.renderList() }
        </FadeIn>
      </LazyLoader>
    )
  }
}