<template>
  <div class="relative w-full h-full">
    <div ref="mapContainer" class="w-full h-full rounded-none" />
  </div>
</template>

<script setup lang="ts">
import type { Map, Marker, DivIcon } from 'leaflet'

interface Org {
  Id: number
  nom: string
  latitude?: number | null
  longitude?: number | null
  echelle?: string
  tags_fonction?: string
  territoire?: string
  localisation_ville?: string
  url?: string
  prioritaire?: boolean
}

const props = defineProps<{
  orgs: Org[]
  selectedId?: number | null
}>()

const emit = defineEmits<{
  'select-org': [id: number]
}>()

const mapContainer = ref<HTMLElement | null>(null)
let mapInstance: Map | null = null
let clusterGroup: any = null
const markers = new Map<number, Marker>()
let tileLayerInstance: any = null

// Créer une DivIcon pour les pins personnalisés
function createPinIcon(isPrioritaire: boolean, isSelected = false): DivIcon {
  const L = (window as any).L
  const bg = isPrioritaire ? '#f5b342' : 'rgba(26, 34, 56, 0.6)'
  const border = isPrioritaire ? '#1a2238' : '#ffffff'
  const size = isSelected ? 18 : 14
  const shadow = isSelected ? '0 0 0 4px rgba(245,179,66,0.5)' : 'none'

  return L.divIcon({
    className: '',
    html: `<div style="
      width: ${size}px;
      height: ${size}px;
      border-radius: 50%;
      background: ${bg};
      border: 2px solid ${border};
      box-shadow: ${shadow};
      transition: all 0.2s;
    "></div>`,
    iconSize: [size, size],
    iconAnchor: [size / 2, size / 2],
    popupAnchor: [0, -(size / 2 + 4)],
  })
}

async function initMap() {
  if (!mapContainer.value) return

  const Lmod = await import('leaflet')
  const L: any = (Lmod as any).default || Lmod
  await import('leaflet/dist/leaflet.css')
  // @ts-ignore
  await import('leaflet.markercluster/dist/MarkerCluster.css')
  // @ts-ignore
  await import('leaflet.markercluster/dist/MarkerCluster.Default.css')

  // Installer L globalement AVANT le plugin (markercluster lit window.L au load)
  ;(window as any).L = L
  // @ts-ignore — étend L.MarkerClusterGroup en side effect
  await import('leaflet.markercluster')
  const MarkerClusterGroup = L.MarkerClusterGroup

  mapInstance = L.map(mapContainer.value, {
    center: [46.6, 2.3],
    zoom: 6,
    zoomControl: true,
    attributionControl: true,
    maxBounds: [[41.0, -5.5], [51.5, 10.0]],
    maxBoundsViscosity: 1.0,
    minZoom: 5,
    maxZoom: 18,
  })

  // Fond de carte CartoDB Positron (light ou dark selon theme)
  const isDark = typeof document !== 'undefined' && document.documentElement.classList.contains('dark')
  const tileUrl = isDark
    ? 'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png'
    : 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png'

  tileLayerInstance = L.tileLayer(tileUrl, {
    attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors © <a href="https://carto.com/attributions">CARTO</a>',
    maxZoom: 19,
  })
  tileLayerInstance.addTo(mapInstance!)

  // Cluster dès 15+ pins
  clusterGroup = new MarkerClusterGroup({
    disableClusteringAtZoom: 14,
    maxClusterRadius: 50,
    showCoverageOnHover: false,
    iconCreateFunction: (cluster: any) => {
      const count = cluster.getChildCount()
      return L.divIcon({
        html: `<div style="
          width: 36px; height: 36px; border-radius: 50%;
          background: var(--nav-primary);
          color: var(--nav-text-on-primary);
          display: flex; align-items: center; justify-content: center;
          font-weight: 700; font-size: 13px;
          border: 2px solid white;
          font-family: var(--nav-font);
        ">${count}</div>`,
        className: '',
        iconSize: [36, 36],
        iconAnchor: [18, 18],
      })
    },
  })

  mapInstance.addLayer(clusterGroup)
  updateMarkers(L)
}

function updateMarkers(L?: any) {
  if (!mapInstance || !clusterGroup) return
  const leaflet = L || (window as any).L
  if (!leaflet) return

  // Clear existing
  clusterGroup.clearLayers()
  markers.clear()

  const orgsWithCoords = props.orgs.filter(
    (o) => o.latitude != null && o.longitude != null
  )

  orgsWithCoords.forEach((org) => {
    const isSelected = org.Id === props.selectedId
    const icon = createPinIcon(!!org.prioritaire, isSelected)

    const marker = leaflet.marker([org.latitude!, org.longitude!], { icon })

    const fonctions = org.tags_fonction
      ? org.tags_fonction.split(',').map((f: string) => f.trim()).filter(Boolean).slice(0, 2).join(', ')
      : ''

    marker.bindPopup(`
      <div style="font-family: var(--nav-font); min-width: 180px; padding: 4px 0;">
        <div style="font-weight: 700; color: var(--nav-text); margin-bottom: 4px;">${org.nom}</div>
        ${org.echelle ? `<div style="font-size: 11px; color: var(--nav-text-muted);">${org.echelle}${org.localisation_ville ? ' · ' + org.localisation_ville : ''}</div>` : ''}
        ${fonctions ? `<div style="font-size: 11px; color: var(--nav-text-muted); margin-top: 2px;">${fonctions}</div>` : ''}
        <a href="/fiche/${org.Id}" style="
          display: inline-block; margin-top: 8px; font-size: 12px;
          color: var(--nav-primary-solid); text-decoration: underline;
        ">Voir la fiche →</a>
      </div>
    `, { maxWidth: 240 })

    marker.on('click', () => emit('select-org', org.Id))

    markers.set(org.Id, marker)
    clusterGroup.addLayer(marker)
  })
}

// Réagir aux changements de filtres (liste d'orgs)
watch(
  () => props.orgs,
  () => updateMarkers(),
  { deep: false }
)

// Réagir à la sélection
watch(
  () => props.selectedId,
  (newId, oldId) => {
    if (!mapInstance) return
    const leaflet = (window as any).L
    if (!leaflet) return

    // Remettre l'ancien marker à la normale
    if (oldId != null) {
      const oldMarker = markers.get(oldId)
      const oldOrg = props.orgs.find(o => o.Id === oldId)
      if (oldMarker && oldOrg) {
        oldMarker.setIcon(createPinIcon(!!oldOrg.prioritaire, false))
      }
    }
    // Mettre en avant le nouveau marker
    if (newId != null) {
      const newMarker = markers.get(newId)
      const newOrg = props.orgs.find(o => o.Id === newId)
      if (newMarker && newOrg) {
        newMarker.setIcon(createPinIcon(!!newOrg.prioritaire, true))
        // Centrer si visible
        const latLng = newMarker.getLatLng()
        mapInstance.panTo(latLng, { animate: true })
      }
    }
  }
)

// Watcher dark mode — switch tuile CartoDB light_all ↔ dark_all
function updateTileTheme(dark: boolean) {
  if (!mapInstance || !tileLayerInstance) return
  const L = (window as any).L
  if (!L) return
  const url = dark
    ? 'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png'
    : 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png'
  tileLayerInstance.setUrl(url)
}

let themeObserver: MutationObserver | null = null

onMounted(() => {
  initMap()

  // Observer les changements de classe dark sur <html>
  themeObserver = new MutationObserver(() => {
    const dark = document.documentElement.classList.contains('dark')
    updateTileTheme(dark)
  })
  themeObserver.observe(document.documentElement, { attributes: true, attributeFilter: ['class'] })
})

onUnmounted(() => {
  themeObserver?.disconnect()
  if (mapInstance) {
    mapInstance.remove()
    mapInstance = null
  }
})
</script>
