import React from 'react';
import { Transition } from '@headlessui/react'

export default class SiteSwitcher extends React.Component {
  constructor() {
    super()
    this.handleClick = this.handleClick.bind(this)
    this.handleKeydown = this.handleKeydown.bind(this);
    this.populateSites = this.populateSites.bind(this);
    this.state = {
      open: false,
      sites: null,
      error: null,
      loading: true
    }
  }

  componentDidMount() {
    this.populateSites();
    document.addEventListener("keydown", this.handleKeydown);
    document.addEventListener('mousedown', this.handleClick, false);
  }

  componentWillUnmount() {
    document.removeEventListener("keydown", this.handleKeydown);
    document.removeEventListener('mousedown', this.handleClick, false);
  }

  populateSites() {
    if (!this.props.loggedIn) return;

    fetch('/api/sites')
      .then( response => {
        if (!response.ok) { throw response }
        return response.json()
      })
      .then((sites) => this.setState({loading: false, sites: sites}))
      .catch((e) => this.setState({loading: false, error: e}))
  }

  handleClick(e) {
    if (this.dropDownNode && this.dropDownNode.contains(e.target)) return;
    if (!this.state.open) return;

    this.setState({open: false})
  }

  handleKeydown(e) {
    const { query, history, site } = this.props;
    const { sites } = this.state;

    if (e.target.tagName === 'INPUT') return true;
    if (e.ctrlKey || e.metaKey || e.altKey || e.isComposing || e.keyCode === 229 || !sites) return;

    const siteNum = parseInt(e.key)

    if (1 <= siteNum && siteNum <= 9 && siteNum <= sites.length && sites[siteNum-1] !== site.domain) {
      window.location = `/${encodeURIComponent(sites[siteNum-1])}`
    }

  }

  toggle() {
    if (!this.props.loggedIn) return;

    this.setState({open: !this.state.open})

    if (!this.state.sites) {
      this.populateSites();
    }
  }

  renderSiteLink(domain, index) {
    const extraClass = domain === this.props.site.domain ? 'font-medium text-gray-900 dark:text-gray-100 cursor-default font-bold' : 'hover:bg-gray-100 dark:hover:bg-gray-900 hover:text-gray-900 dark:hover:text-gray-100 focus:outline-none focus:bg-gray-100 dark:focus:bg-gray-900 focus:text-gray-900 dark:focus:text-gray-100'
    return (
      <a href={domain === this.props.site.domain ? null : `/${encodeURIComponent(domain)}`} key={domain} className={`flex items-center justify-between truncate px-4 py-2 md:text-sm leading-5 text-gray-700 dark:text-gray-300 ${extraClass}`}>
        <span>
          <img src={`https://icons.duckduckgo.com/ip3/${domain}.ico`} referrerPolicy="no-referrer" onError={(e)=>{e.target.onerror = null; e.target.src="https://icons.duckduckgo.com/ip3/placeholder.ico"}} className="inline w-4 mr-2 align-middle" />
          <span className="truncate inline-block align-middle max-w-3xs pr-2">{domain}</span>
        </span>
        {index < 9 && <span>{index+1}</span>}
      </a>
    )
  }

  renderSettingsLink() {
    if (['owner', 'admin'].includes(this.props.currentUserRole)) {
      return (
        <React.Fragment>
          <div className="py-1">
            <a href={`/${encodeURIComponent(this.props.site.domain)}/settings`} className="group flex items-center px-4 py-2 md:text-sm leading-5 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-900 hover:text-gray-900 dark:hover:text-gray-100 focus:outline-none focus:bg-gray-100 dark:focus:bg-gray-900 focus:text-gray-900 dark:focus:text-gray-100" role="menuitem">
              <svg className="mr-2 h-4 w-4 text-gray-500 dark:text-gray-200 group-hover:text-gray-600 dark:group-hover:text-gray-400 group-focus:text-gray-500 dark:group-focus:text-gray-200" fill="currentColor" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><path fillRule="evenodd" d="M11.49 3.17c-.38-1.56-2.6-1.56-2.98 0a1.532 1.532 0 01-2.286.948c-1.372-.836-2.942.734-2.106 2.106.54.886.061 2.042-.947 2.287-1.561.379-1.561 2.6 0 2.978a1.532 1.532 0 01.947 2.287c-.836 1.372.734 2.942 2.106 2.106a1.532 1.532 0 012.287.947c.379 1.561 2.6 1.561 2.978 0a1.533 1.533 0 012.287-.947c1.372.836 2.942-.734 2.106-2.106a1.533 1.533 0 01.947-2.287c1.561-.379 1.561-2.6 0-2.978a1.532 1.532 0 01-.947-2.287c.836-1.372-.734-2.942-2.106-2.106a1.532 1.532 0 01-2.287-.947zM10 13a3 3 0 100-6 3 3 0 000 6z" clipRule="evenodd"></path></svg>
              Site settings
            </a>
          </div>
          <div className="border-t border-gray-200 dark:border-gray-500"></div>
        </React.Fragment>
      )
    }
  }

  renderDropdown() {
    if (this.state.loading) {
      return <div className="px-4 py-6"><div className="loading sm mx-auto"><div></div></div></div>
    } else if (this.state.error) {
      return <div className="mx-auto px-4 py-6 dark:text-gray-100">Something went wrong, try again</div>
    } else {
      return (
        <React.Fragment>
          { this.renderSettingsLink() }
          <div className="py-1">
            { this.state.sites.map(this.renderSiteLink.bind(this)) }
          </div>
          <div className="border-t border-gray-200 dark:border-gray-500"></div>
          <div className="py-1">
            <a href='/sites/new' className="group flex items-center px-4 py-2 md:text-sm leading-5 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-900 hover:text-gray-900 dark:hover:text-gray-100 focus:outline-none focus:bg-gray-100 dark:focus:bg-gray-900 focus:text-gray-900 dark:focus:text-gray-100" role="menuitem">
            <svg className="mr-2 h-4 w-4 text-gray-500 dark:text-gray-200 group-hover:text-gray-600 dark:group-hover:text-gray-400 group-focus:text-gray-500 dark:group-focus:text-gray-200" fill="none" stroke="currentColor" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M12 6v6m0 0v6m0-6h6m-6 0H6"></path></svg>
              Add Site
            </a>
          </div>
        </React.Fragment>
      )
    }
  }

  renderArrow() {
    if (this.props.loggedIn) {
      return (
        <svg className="-mr-1 ml-1 md:ml-2 h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
          <path fillRule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clipRule="evenodd" />
        </svg>
      )
    }
  }

  render() {
    const hoverClass = this.props.loggedIn ? 'hover:text-gray-500 dark:hover:text-gray-200 focus:border-blue-300 focus:ring ' : 'cursor-default'

    return (
      <div className="relative inline-block text-left z-10 mr-2 sm:mr-4">
        <button onClick={this.toggle.bind(this)} className={`inline-flex items-center md:text-lg w-full rounded-md py-2 leading-5 font-bold text-gray-700 dark:text-gray-300 focus:outline-none transition ease-in-out duration-150 ${hoverClass}`}>

          <img src={`https://icons.duckduckgo.com/ip3/${this.props.site.domain}.ico`} onError={(e)=>{e.target.onerror = null; e.target.src="https://icons.duckduckgo.com/ip3/placeholder.ico"}} referrerPolicy="no-referrer" className="inline w-4 mr-1 md:mr-2 align-middle" />
          <span className="hidden sm:inline-block">{this.props.site.domain}</span>
          {this.renderArrow()}
        </button>

        <Transition
          show={this.state.open}
          enter="transition ease-out duration-100 transform"
          enterFrom="opacity-0 scale-95"
          enterTo="opacity-100 scale-100"
          leave="transition ease-in duration-75 transform"
          leaveFrom="opacity-100 scale-100"
          leaveTo="opacity-0 scale-95"
        >
        <div className="origin-top-left absolute left-0 mt-2 w-64 rounded-md shadow-lg" ref={node => this.dropDownNode = node} >
          <div className="rounded-md bg-white dark:bg-gray-800 ring-1 ring-black ring-opacity-5">
            { this.renderDropdown() }
          </div>
        </div>
        </Transition>
      </div>
    )
  }
}