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

import * as storage from '../../storage'
import LazyLoader from '../../lazy-loader'
import Browsers from './browsers'
import OperatingSystems from './operating-systems'
import FadeIn from '../../fade-in'
import numberFormatter from '../../number-formatter'
import Bar from '../bar'
import * as api from '../../api'
import * as url from '../../url'


const EXPLANATION = {
  'Mobile': 'up to 576px',
  'Tablet': '576px to 992px',
  'Laptop': '992px to 1440px',
  'Desktop': 'above 1440px',
}

function iconFor(screenSize) {
  if (screenSize === 'Mobile') {
    return (
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="-mt-px feather"><rect x="5" y="2" width="14" height="20" rx="2" ry="2"/><line x1="12" y1="18" x2="12" y2="18"/></svg>
    )
  } else if (screenSize === 'Tablet') {
    return (
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="-mt-px feather"><rect x="4" y="2" width="16" height="20" rx="2" ry="2" transform="rotate(180 12 12)"/><line x1="12" y1="18" x2="12" y2="18"/></svg>
    )
  } else if (screenSize === 'Laptop') {
    return (
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="-mt-px feather"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="2" y1="20" x2="22" y2="20"/></svg>
    )
  } else if (screenSize === 'Desktop') {
    return (
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="-mt-px feather"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
    )
  }
}

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

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

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

  fetchScreenSizes() {
    api.get(
      `/api/stats/${encodeURIComponent(this.props.site.domain)}/screen-sizes`,
      this.props.query
    )
      .then((res) => this.setState({loading: false, sizes: res}))
  }

  showConversionRate() {
    return !!this.props.query.filters.goal
  }


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

  renderScreenSize(size) {
    const query = new URLSearchParams(window.location.search)
    query.set('screen', size.name)
    const maxWidthDeduction =  this.showConversionRate() ? "10rem" : "5rem"

    return (
      <div className="flex items-center justify-between my-1 text-sm" key={size.name}>
        <Bar
          count={size.visitors}
          all={this.state.sizes}
          bg="bg-green-50 dark:bg-gray-500 dark:bg-opacity-15"
          maxWidthDeduction={maxWidthDeduction}
        >
          <span
            tooltip={EXPLANATION[size.name]}
            className="flex px-2 py-1.5 dark:text-gray-300"
          >
            <Link className="md:truncate block hover:underline" to={url.setQuery('screen', size.name)}>
              {iconFor(size.name)} {size.name}
            </Link>
          </span>
        </Bar>
        <span className="font-medium dark:text-gray-200 text-right w-20">
          {numberFormatter(size.visitors)} <span className="inline-block w-8 text-xs text-right">({size.percentage}%)</span>
        </span>
        {this.showConversionRate() && <span className="font-medium dark:text-gray-200 w-20 text-right">{numberFormatter(size.conversion_rate)}%</span>}
      </div>
    )
  }

  renderList() {
    if (this.state.sizes && this.state.sizes.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"
          >
            <span>Screen size</span>
            <div className="text-right">
              <span className="inline-block w-20">{ this.label() }</span>
              {this.showConversionRate() && <span className="inline-block w-20">CR</span>}
            </div>
          </div>
          { this.state.sizes && this.state.sizes.map(this.renderScreenSize.bind(this)) }
        </React.Fragment>
      )
    }
    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} class="flex-grow">
          { this.renderList() }
        </FadeIn>
      </LazyLoader>
    )
  }
}

export default class Devices extends React.Component {
  constructor(props) {
    super(props)
    this.tabKey = `deviceTab__${  props.site.domain}`
    const storedTab = storage.getItem(this.tabKey)
    this.state = {
      mode: storedTab || 'size'
    }
  }


  setMode(mode) {
    return () => {
      storage.setItem(this.tabKey, mode)
      this.setState({mode})
    }
  }

  renderContent() {
    switch (this.state.mode) {
      case 'browser':
        return <Browsers site={this.props.site} query={this.props.query} timer={this.props.timer} />
      case 'os':
        return (
          <OperatingSystems
            site={this.props.site}
            query={this.props.query}
            timer={this.props.timer}
          />
        )
      case 'size':
      default:
        return (
          <ScreenSizes
            site={this.props.site}
            query={this.props.query}
            timer={this.props.timer}
          />
        )
    }
  }

  renderPill(name, mode) {
    const isActive = this.state.mode === mode

    if (isActive) {
      return (
        <li
          className="inline-block h-5 font-bold text-indigo-700 border-b-2 border-indigo-700 dark:text-indigo-500 dark:border-indigo-500"
        >
          {name}
        </li>
      )
    }

    return (
      <li
        className="cursor-pointer hover:text-indigo-600"
        onClick={this.setMode(mode)}
      >
        {name}
      </li>
    )
  }

  render() {
    return (
      <div
        className="stats-item flex flex-col mt-6 stats-item--has-header w-full"
      >
        <div
          className="stats-item__header flex flex-col flex-grow relative p-4 bg-white rounded shadow-xl dark:bg-gray-825"
        >
          <div className="flex justify-between w-full">
            <h3 className="font-bold dark:text-gray-100">Devices</h3>
            <ul className="flex text-xs font-medium text-gray-500 dark:text-gray-400 space-x-2">
              { this.renderPill('Size', 'size') }
              { this.renderPill('Browser', 'browser') }
              { this.renderPill('OS', 'os') }
            </ul>
          </div>
          { this.renderContent() }
        </div>
      </div>
    )
  }
}