import L from 'leaflet'
import './leaflet.bezier'

const arcStyles = {
  edu: {
    color: 'rgb(245, 246, 150)',
    fillColor: 'rgb(245, 246, 150)',
    opacity: 0.5,
    weight: '1',
  },
  company: {
    color: 'rgb(50, 100, 246)',
    fillColor: 'rgb(50, 100, 246)',
    opacity: 1.0,
    weight: '2',
  },
  gov: {
    color: 'rgb(245, 150, 100)',
    fillColor: 'rgb(245, 150, 150)',
    opacity: 1.0,
    weight: '2',
  },
  mil: {
    color: 'rgb(245, 0, 0)',
    fillColor: 'rgb(245, 0, 0)',
    opacity: 1.0,
    weight: '2',
  },
}

const sortOrder = ['edu', 'company', 'gov', 'mil']

const redDot = L.icon({
  iconUrl: '/assets/img/reddot.png',
  iconSize: [17, 17], // size of the icon
  iconAnchor: [8, 8], // point of the icon which will correspond to marker's location
  popupAnchor: [0, -5] // point from which the popup should open relative to the iconAnchor
})

function addMarker(map, latlng, title, subtext, year) {
  const marker = L.marker(latlng, { icon: redDot }).addTo(map)
  let message = [
    "<b>", title, "</b>",
  ]
  message = message.concat([
    "<br>",
    subtext,
  ])
  if (year) {
    message.push(" (" + year + ")")
  }
  marker.bindPopup(message.join(''))
  return marker
}

function addArc(map, src, dest, arcStyle) {
  L.bezier({
    path: [
      [
        { lat: src[0], lng: src[1] },
        { lat: dest[0], lng: dest[1] },
      ],
    ]
  }, arcStyle).addTo(map)
}

export default function append(el, payload) {
  const { data } = payload
  let { paper, address, citations } = data
  let source = [0, 0]

  let map = L.map(el).setView([25, 0], 2)
  L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token={accessToken}', {
    attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
      '<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
      'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
    maxZoom: 18,
    id: 'mapbox.dark',
    style: 'mapbox://styles/mapbox/dark-v9',
    accessToken: 'pk.eyJ1IjoiZmFuc2FsY3kiLCJhIjoiY2pvN3I1czJwMHF5NDNrbWRoMWpteHlrdCJ9.kMpM5syQUhVjKkn1iVx9fg'
  }).addTo(map)

  if (address) {
    source = [address.lat, address.lng].map(n => parseFloat(n))
  } else {
    console.error("No address found for root paper")
    console.log(data)
  }

  citations.forEach(citation => {
    // console.log(citation)
    const citationAddress = citation.addresses[0]
    const latlng = [citationAddress.lat, citationAddress.lng].map(n => parseFloat(n))
    if (Number.isNaN(latlng[0]) || Number.isNaN(latlng[1])) return
    addMarker(map, latlng, citation.title, citationAddress.name, citation.year)
    addArc(map, source, latlng, arcStyles[citationAddress.type])
  })

  console.log(paper)

  const rootMarker = addMarker(map, source, paper.title, address.name, paper.year)
  rootMarker.openPopup()

  // a transparent div to cover the map, so normal scroll events will not be eaten by leaflet
  const mapCover = document.createElement("div")
  mapCover.classList.add("map_cover")
  mapCover.innerHTML = "<div class='cover_message'>Click here to explore the map</div>"
  mapCover.querySelector('div').addEventListener('click', () => {
    map.scrollWheelZoom.enable()
    el.removeChild(mapCover)
  })
  function stopPropagation(e) {
    e.stopPropagation()
  }
  mapCover.addEventListener('mousewheel', stopPropagation, true)
  mapCover.addEventListener('DOMMouseScroll', stopPropagation, true)

  map.scrollWheelZoom.disable()
  map.on('focus', () => {
    map.scrollWheelZoom.enable()
    el.removeChild(mapCover)
  })
  map.on('blur', () => {
    map.scrollWheelZoom.disable()
    // el.appendChild(mapCover)
  })

  el.appendChild(mapCover)
}