declare global {
  interface Window {
    T?: {
      Map: new (container: HTMLElement | string) => TiandituMap
      LngLat: new (lng: number, lat: number) => TiandituLngLat
      Marker: new (lnglat: TiandituLngLat, options?: { icon?: TiandituIcon }) => TiandituMarker
      Icon: new (options: {
        iconUrl: string
        iconSize: TiandituPoint
        iconAnchor?: TiandituPoint
      }) => TiandituIcon
      Point: new (x: number, y: number) => TiandituPoint
      Label: new (options: {
        text: string
        position: TiandituLngLat
        offset?: TiandituPoint
      }) => TiandituLabel
      Overlay: {
        extend: (proto: Record<string, unknown>) => new (
          lnglat: TiandituLngLat,
          options: SchoolMapOverlayOptions,
        ) => TiandituSchoolOverlay
      }
      LocalSearch: new (
        map: TiandituMap,
        config: TiandituLocalSearchConfig,
      ) => TiandituLocalSearch
    }
  }
}

export interface TiandituSearchPoi {
  name: string
  address?: string
  lonlat?: string
  lon?: number | string
  lng?: number | string
  lat?: number | string
}

export interface TiandituLocalSearchResult {
  getResultType(): number | string
  getPois(): TiandituSearchPoi[] | Record<string, TiandituSearchPoi> | false | null
}

export interface TiandituLocalSearchConfig {
  pageCapacity?: number
  onSearchComplete?: (result: TiandituLocalSearchResult) => void
}

export interface TiandituLocalSearch {
  search(keyword: string): void
}

export interface SchoolMapOverlayOptions {
  name: string
  active?: boolean
}

export interface TiandituLngLat {
  lng: number
  lat: number
}

export interface TiandituMarker {
  addEventListener(type: string, handler: () => void): void
}

export interface TiandituLabel {
  addEventListener?(type: string, handler: () => void): void
  setStyle?(style: Record<string, string>): void
  getElement?(): HTMLElement | null
}

export interface TiandituSchoolOverlay {
  addEventListener(type: string, handler: () => void): void
  setActive?(active: boolean): void
}

export interface TiandituIcon {
  // marker icon handle
}

export interface TiandituPoint {
  x: number
  y: number
}

export interface TiandituMapClickEvent {
  lnglat?: TiandituLngLat
}

export interface TiandituMap {
  centerAndZoom(lnglat: TiandituLngLat, zoom: number): void
  enableScrollWheelZoom(): void
  addOverLay(overlay: TiandituMarker | TiandituSchoolOverlay): void
  removeOverLay(overlay: TiandituMarker | TiandituSchoolOverlay): void
  setViewport?(points: TiandituLngLat[]): void
  clearOverLays?(): void
  addEventListener?(type: string, handler: (e?: TiandituMapClickEvent) => void): void
  removeEventListener?(type: string, handler: (e?: TiandituMapClickEvent) => void): void
  lngLatToLayerPoint?(lnglat: TiandituLngLat): TiandituPoint
  getPanes?(): { overlayPane: HTMLElement }
  checkResize?(): void
  destroy?(): void
}

/** 弹窗内地图在容器尺寸变化后需重算布局，避免瓦片错位到页面顶部 */
export function invalidateMapSize(map: TiandituMap) {
  map.checkResize?.()
}

interface SchoolMapOverlayInstance {
  lnglat: TiandituLngLat
  options: SchoolMapOverlayOptions
  map: TiandituMap | null
  _div: HTMLDivElement | null
  _onMapChange: (() => void) | null
  _listeners: { type: string; handler: () => void }[]
  initialize(lnglat: TiandituLngLat, options: SchoolMapOverlayOptions): void
  onAdd(map: TiandituMap): void
  onRemove(): void
  update(): void
  setActive(active: boolean): void
  addEventListener(type: string, handler: () => void): void
}

let loadPromise: Promise<NonNullable<typeof window.T>> | null = null
let schoolMapOverlayClass: (new (
  lnglat: TiandituLngLat,
  options: SchoolMapOverlayOptions,
) => TiandituSchoolOverlay) | null = null

/** 天地图浏览器端 Key（国家测绘） */
const DEFAULT_TIANDITU_TK = 'cc3f61fa6cafe2f0ad440018d0f07b13'

export function getTiandituKey(): string {
  return import.meta.env.VITE_TIANDITU_TK?.trim() || DEFAULT_TIANDITU_TK
}

export function loadTianditu(): Promise<NonNullable<typeof window.T>> {
  if (window.T) {
    return Promise.resolve(window.T)
  }

  if (!loadPromise) {
    loadPromise = new Promise((resolve, reject) => {
      const tk = getTiandituKey()
      if (!tk) {
        reject(new Error('未配置 VITE_TIANDITU_TK'))
        return
      }

      const script = document.createElement('script')
      script.src = `https://api.tianditu.gov.cn/api?v=4.0&tk=${encodeURIComponent(tk)}`
      script.async = true
      script.onload = () => {
        if (window.T) {
          resolve(window.T)
        } else {
          reject(new Error('天地图 SDK 加载失败'))
        }
      }
      script.onerror = () => reject(new Error('天地图脚本加载失败'))
      document.head.appendChild(script)
    })
  }

  return loadPromise
}

/** 地图默认中心：苏州市 */
export const SUZHOU_MAP_CENTER = { lng: 120.585316, lat: 31.298886 }
/** 默认缩放：以苏州为中心，首屏仅展示苏州市域 */
export const SUZHOU_MAP_ZOOM = 11

function escapeMapLabelHtml(text: string): string {
  return text
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
}

function getSchoolMapOverlayClass(T: NonNullable<typeof window.T>) {
  if (schoolMapOverlayClass) return schoolMapOverlayClass

  const proto: SchoolMapOverlayInstance = {
    lnglat: { lng: 0, lat: 0 },
    options: { name: '' },
    map: null,
    _div: null,
    _onMapChange: null,
    _listeners: [],
    initialize(lnglat, options) {
      this.lnglat = lnglat
      this.options = options || { name: '' }
      this._listeners = []
    },
    onAdd(map) {
      this.map = map
      const div = document.createElement('div')
      div.className = 'slake-map-school-marker'
      if (this.options.active) div.classList.add('is-active')
      div.setAttribute('role', 'button')
      div.setAttribute('tabindex', '0')
      div.innerHTML =
        '<span class="slake-map-school-dot" aria-hidden="true"></span>' +
        `<span class="slake-map-school-label">${escapeMapLabelHtml(this.options.name.trim() || '—')}</span>`
      this._div = div
      map.getPanes?.().overlayPane.appendChild(div)

      this._onMapChange = () => this.update()
      map.addEventListener?.('move', this._onMapChange)
      map.addEventListener?.('zoomend', this._onMapChange)

      this.update()

      for (const { type, handler } of this._listeners) {
        this._div?.addEventListener(type, handler)
      }
    },
    onRemove() {
      const map = this.map
      if (map && this._onMapChange) {
        map.removeEventListener?.('move', this._onMapChange)
        map.removeEventListener?.('zoomend', this._onMapChange)
      }
      if (this._div?.parentNode) {
        this._div.parentNode.removeChild(this._div)
      }
      this.map = null
      this._div = null
    },
    update() {
      const map = this.map
      if (!map?.lngLatToLayerPoint || !this._div) return
      const pos = map.lngLatToLayerPoint(this.lnglat)
      this._div.style.left = `${pos.x}px`
      this._div.style.top = `${pos.y}px`
    },
    setActive(active) {
      this.options.active = active
      this._div?.classList.toggle('is-active', active)
    },
    addEventListener(type, handler) {
      if (this._div) {
        this._div.addEventListener(type, handler)
        return
      }
      this._listeners.push({ type, handler })
    },
  }

  schoolMapOverlayClass = T.Overlay.extend(proto as unknown as Record<string, unknown>) as new (
    lnglat: TiandituLngLat,
    options: SchoolMapOverlayOptions,
  ) => TiandituSchoolOverlay

  return schoolMapOverlayClass
}

/** 圆点 + 校名一体覆盖物（flex 横排，与原型一致） */
export function createSchoolMapOverlay(
  T: NonNullable<typeof window.T>,
  school: { name: string; longitude: number; latitude: number },
  active = false,
): TiandituSchoolOverlay {
  const OverlayClass = getSchoolMapOverlayClass(T)
  return new OverlayClass(new T.LngLat(school.longitude, school.latitude), {
    name: school.name,
    active,
  })
}

export function shortenSchoolMapLabel(name: string, max = 12): string {
  const t = name.trim()
  if (!t) return '—'
  return t.length > max ? `${t.slice(0, max)}…` : t
}

function parseLonlatPair(first: unknown, second: unknown): { lng: number; lat: number } | null {
  let lng = Number(first)
  let lat = Number(second)
  if (!Number.isFinite(lng) || !Number.isFinite(lat)) return null
  // 部分结果可能为 "纬度,经度"，按中国范围自动纠正
  if (lng <= 60 && lat >= 70) {
    ;[lng, lat] = [lat, lng]
  }
  return { lng, lat }
}

/** 解析天地图 POI 坐标（支持 "经度 纬度"、"经度,纬度" 及 lon/lat 字段） */
export function parseTiandituPoiLonlat(
  poi: TiandituSearchPoi | string,
): { lng: number; lat: number } | null {
  if (typeof poi === 'string') {
    const text = poi.trim()
    if (!text) return null
    const parts = text.split(/[\s,;，]+/).filter(Boolean)
    if (parts.length < 2) return null
    return parseLonlatPair(parts[0], parts[1])
  }

  const extra = poi as unknown as Record<string, unknown>
  const rawLonlat = poi.lonlat ?? extra.LonLat ?? extra.lonLat
  if (typeof rawLonlat === 'string' && rawLonlat.trim()) {
    const fromLonlat = parseTiandituPoiLonlat(rawLonlat)
    if (fromLonlat) return fromLonlat
  }

  const lng = poi.lng ?? poi.lon ?? extra.Lon
  const lat = poi.lat ?? extra.Lat
  if (lng != null && lat != null) {
    return parseLonlatPair(lng, lat)
  }

  return null
}

/** 规范化 LocalSearch 返回的 POI 列表 */
export function normalizeTiandituPois(pois: unknown): TiandituSearchPoi[] {
  if (!pois) return []
  if (Array.isArray(pois)) return pois
  if (typeof pois === 'object') return Object.values(pois)
  return []
}

/** 高校雷达网地图：固定以苏州市为中心展示 */
export function centerMapOnSuzhou(
  map: TiandituMap,
  T: NonNullable<typeof window.T>,
  zoom = SUZHOU_MAP_ZOOM,
) {
  map.centerAndZoom(new T.LngLat(SUZHOU_MAP_CENTER.lng, SUZHOU_MAP_CENTER.lat), zoom)
}

export function fitMapToSchools(
  map: TiandituMap,
  T: NonNullable<typeof window.T>,
  schools: { latitude: number; longitude: number }[],
) {
  if (!schools.length) return

  const points = schools.map((s) => new T.LngLat(s.longitude, s.latitude))

  if (schools.length === 1) {
    map.centerAndZoom(points[0], SUZHOU_MAP_ZOOM)
    return
  }

  if (typeof map.setViewport === 'function') {
    map.setViewport(points)
    return
  }

  const lngs = schools.map((s) => s.longitude)
  const lats = schools.map((s) => s.latitude)
  const center = new T.LngLat(
    (Math.min(...lngs) + Math.max(...lngs)) / 2,
    (Math.min(...lats) + Math.max(...lats)) / 2,
  )
  map.centerAndZoom(center, SUZHOU_MAP_ZOOM)
}

export {}