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, citations) {
  const marker = L.marker(latlng, { icon: redDot }).addTo(map)
  let message = citations.map(citation => {
    const { title, addresses, year, pdf, doi } = citation
    let rec = [
      "<b>", title, "</b>",
    ]
    if (pdf && pdf.length) {
      rec.unshift("<a href='" + pdf[0] + "' target='_blank'>")
      rec.push("</a>")
    }
    else if (doi && doi.length) {
      rec.unshift("<a href='" + doi[0] + "' target='_blank'>")
      rec.push("</a>")
    }
    if (year) {
      rec.push(" (" + year + ")")
    }
    const addressString = addresses.map(addr => addr.name).join('<br/>')
    rec.push("<br>")
    rec.push(addressString)
    return rec.join("")
  })

  marker.bindPopup(message.join('<br><br>'))
  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
  if (!data) return
  let { paper, 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 (paper.addresses && paper.addresses.length) {
    source = [paper.addresses[0].lat, paper.addresses[0].lng].map(n => (parseFloat(n) || 0))
  } else {
    console.error("No address found for root paper")
    // console.log(data)
  }

  // group papers by address
  let citationsByAddress = {}
  citations.forEach(citation => {
    if (!citation.addresses) {
      // console.log(citation)
      return
    }
    // console.log(citation)
    citation.addresses.forEach(address => {
      if (!(address.name in citationsByAddress)) {
        citationsByAddress[address.name] = { address, citations: []}
      }
      citationsByAddress[address.name].citations.push(citation)
    })
  })

  Object.keys(citationsByAddress).map(name => {
    const { citations: citationList, address: citationAddress } = citationsByAddress[name]
    // console.log(name, citationsByAddress[name])
    // console.log(citation)
    const latlng = [citationAddress.lat, citationAddress.lng].map(n => parseFloat(n))
    if (Number.isNaN(latlng[0]) || Number.isNaN(latlng[1])) return
    addMarker(map, latlng, citationList)
    const style = { ...arcStyles[citationAddress.type] }
    let weight = Math.min(citationList.length, 5)
    let opacity = 0.5 + Math.min(citationList.length / 5, 0.5)
    if (citationAddress.type !== 'edu') {
      weight += 1
      opacity = 1
    }
    style.weight = String(weight)
    style.opacity = opacity
    addArc(map, source, latlng, style)
  })

  // console.log(paper)

  const rootMarker = addMarker(map, source, [paper])
  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()
    if (mapCover.parentNode === el) {
      el.removeChild(mapCover)
    }
  })
  mapCover.querySelector('div').addEventListener('touchstart', (e) => {
    e.preventDefault()
  })
  mapCover.querySelector('div').addEventListener('tap', () => {
    map.scrollWheelZoom.enable()
    if (mapCover.parentNode === el) {
      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()
    if (mapCover.parentNode === el) {
      el.removeChild(mapCover)
    }
  })
  map.on('blur', () => {
    map.scrollWheelZoom.disable()
    // el.appendChild(mapCover)
  })

  el.appendChild(mapCover)
}