import type L from 'leaflet'
import { HnHMaxZoom, ImageIcon, TileSize } from '~/lib/LeafletCustomTypes'

export interface MarkerData {
  id: number
  position: { x: number; y: number }
  name: string
  image: string
  hidden: boolean
  map: number
}

export interface MapViewRef {
  map: L.Map
  mapid: number
  markerLayer: L.LayerGroup
}

export interface MapMarker {
  id: number
  position: { x: number; y: number }
  name: string
  image: string
  type: string
  text: string
  value: number
  hidden: boolean
  map: number
  leafletMarker: L.Marker | null
  remove: (mapview: MapViewRef) => void
  add: (mapview: MapViewRef) => void
  update: (mapview: MapViewRef, updated: MarkerData | MapMarker) => void
  jumpTo: (map: L.Map) => void
  setClickCallback: (callback: (e: L.LeafletMouseEvent) => void) => void
  setContextMenu: (callback: (e: L.LeafletMouseEvent) => void) => void
}

function detectType(name: string): string {
  if (name === 'gfx/invobjs/small/bush' || name === 'gfx/invobjs/small/bumling') return 'quest'
  if (name === 'custom') return 'custom'
  return name.substring('gfx/terobjs/mm/'.length)
}

export interface MarkerIconOptions {
  /** Resolves relative icon path to absolute URL (e.g. with app base path). */
  resolveIconUrl: (path: string) => string
  /** Optional fallback URL when the icon image fails to load. */
  fallbackIconUrl?: string
}

export type LeafletApi = typeof import('leaflet')

export function createMarker(
  data: MarkerData,
  iconOptions: MarkerIconOptions | undefined,
  L: LeafletApi
): MapMarker {
  let leafletMarker: L.Marker | null = null
  let onClick: ((e: L.LeafletMouseEvent) => void) | null = null
  let onContext: ((e: L.LeafletMouseEvent) => void) | null = null

  const marker: MapMarker = {
    id: data.id,
    position: { ...data.position },
    name: data.name,
    image: data.image,
    type: detectType(data.image),
    text: data.name,
    value: data.id,
    hidden: data.hidden,
    map: data.map,

    get leafletMarker() {
      return leafletMarker
    },

    remove(_mapview: MapViewRef): void {
      if (leafletMarker) {
        leafletMarker.remove()
        leafletMarker = null
      }
    },

    add(mapview: MapViewRef): void {
      if (!marker.hidden) {
        const resolve = iconOptions?.resolveIconUrl ?? ((path: string) => path)
        const fallback = iconOptions?.fallbackIconUrl
        let icon: L.Icon
        if (marker.image === 'gfx/terobjs/mm/custom') {
          icon = new ImageIcon({
            iconUrl: resolve('gfx/terobjs/mm/custom.png'),
            iconSize: [21, 23],
            iconAnchor: [11, 21],
            popupAnchor: [1, 3],
            tooltipAnchor: [1, 3],
            fallbackIconUrl: fallback,
          })
        } else {
          icon = new ImageIcon({
            iconUrl: resolve(`${marker.image}.png`),
            iconSize: [32, 32],
            fallbackIconUrl: fallback,
          })
        }

        const position = mapview.map.unproject([marker.position.x, marker.position.y], HnHMaxZoom)
        leafletMarker = L.marker(position, { icon })
        const gridX = Math.floor(marker.position.x / TileSize)
        const gridY = Math.floor(marker.position.y / TileSize)
        const tooltipContent = `${marker.name} · ${gridX}, ${gridY}`
        leafletMarker.bindTooltip(tooltipContent, {
          direction: 'top',
          permanent: false,
          offset: L.point(0, -14),
        })
        leafletMarker.addTo(mapview.markerLayer)
        const markerEl = (leafletMarker as unknown as { getElement?: () => HTMLElement }).getElement?.()
        if (markerEl) markerEl.setAttribute('aria-label', marker.name)
        leafletMarker.on('click', (e: L.LeafletMouseEvent) => {
          if (onClick) onClick(e)
        })
        leafletMarker.on('contextmenu', (e: L.LeafletMouseEvent) => {
          if (onContext) onContext(e)
        })
      }
    },

    update(mapview: MapViewRef, updated: MarkerData | MapMarker): void {
      marker.position = { ...updated.position }
      marker.name = updated.name
      marker.hidden = updated.hidden
      marker.map = updated.map
      if (leafletMarker) {
        const position = mapview.map.unproject([updated.position.x, updated.position.y], HnHMaxZoom)
        leafletMarker.setLatLng(position)
        const gridX = Math.floor(updated.position.x / TileSize)
        const gridY = Math.floor(updated.position.y / TileSize)
        leafletMarker.setTooltipContent(`${marker.name} · ${gridX}, ${gridY}`)
      }
    },

    jumpTo(map: L.Map): void {
      if (leafletMarker) {
        const position = map.unproject([marker.position.x, marker.position.y], HnHMaxZoom)
        leafletMarker.setLatLng(position)
      }
    },

    setClickCallback(callback: (e: L.LeafletMouseEvent) => void): void {
      onClick = callback
    },

    setContextMenu(callback: (e: L.LeafletMouseEvent) => void): void {
      onContext = callback
    },
  }

  return marker
}