declare global {
  interface Window {
    T?: {
      Map: new (
        container: HTMLElement | string,
        options?: { layers?: TiandituTileLayer[] },
      ) => 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
      TileLayer?: new (
        url: string,
        options?: { minZoom?: number; maxZoom?: number },
      ) => TiandituTileLayer
      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 TiandituTileLayer {
  // tile layer handle
}

export interface TiandituPoint {
  x: number
  y: number
}

export interface TiandituMapClickEvent {
  lnglat?: TiandituLngLat
  containerPoint?: TiandituPoint
}

export interface TiandituMap {
  centerAndZoom(lnglat: TiandituLngLat, zoom: number): void
  enableScrollWheelZoom(): void
  enableDrag?(): void
  disableDrag?(): void
  enableAutoResize?(): void
  panBy?(position: TiandituPoint): void
  addOverLay(overlay: TiandituMarker | TiandituLabel | TiandituSchoolOverlay): void
  removeOverLay(overlay: TiandituMarker | TiandituLabel | TiandituSchoolOverlay): void
  setViewport?(points: TiandituLngLat[]): void
  clearOverLays?(): void
  addLayer?(layer: TiandituTileLayer): void
  addEventListener?(type: string, handler: (e?: TiandituMapClickEvent) => void): void
  removeEventListener?(type: string, handler: (e?: TiandituMapClickEvent) => void): void
  lngLatToLayerPoint?(lnglat: TiandituLngLat): TiandituPoint
  lngLatToContainerPoint?(lnglat: TiandituLngLat): TiandituPoint
  getPanes?(): Record<string, HTMLElement>
  getContainer?(): HTMLElement
  checkResize?(): void
  destroy?(): void
}

const MAP_INTERACTIVE_PANE_KEYS = new Set(['mapPane', 'tilePane', 'floatPane'])
const MAP_PASSTHROUGH_PANE_CLASS_RE =
  /tdt-overlay-pane|tdt-marker-pane|tdt-tooltip-pane|tdt-popup-pane|tdt-shadow-pane/i

function invokeMapMethod(map: TiandituMap, method: string) {
  const fn = (map as unknown as Record<string, unknown>)[method]
  if (typeof fn === 'function') {
    ;(fn as () => void).call(map)
  }
}

/** 创建天地图实例。使用 SDK 默认底图，避免自定义瓦片图层影响拖拽/初始化。 */
export function createTiandituMap(
  T: NonNullable<typeof window.T>,
  container: HTMLElement | string,
): TiandituMap {
  return new T.Map(container)
}

/** 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?.()
}

/** 等待地图容器具备有效宽高（弹窗动画期间常为 0） */
export async function waitForMapContainerReady(
  container: HTMLElement,
  timeoutMs = 5000,
): Promise<boolean> {
  const deadline = Date.now() + timeoutMs
  while (Date.now() < deadline) {
    const rect = container.getBoundingClientRect()
    if (rect.width > 0 && rect.height > 0) return true
    await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()))
  }
  return false
}

/** 重新计算尺寸并刷新视野，修复弹窗内瓦片不渲染 */
export function refreshMapView(
  map: TiandituMap,
  T: NonNullable<typeof window.T>,
  center: { lng: number; lat: number },
  zoom: number,
) {
  invalidateMapSize(map)
  map.centerAndZoom(new T.LngLat(center.lng, center.lat), zoom)
  scheduleMapResize(map, [50, 200, 500])
}

/** 容器尺寸变化时自动触发 checkResize（弹窗、侧栏展开等场景） */
export function bindMapResizeObserver(
  container: HTMLElement,
  getMap: () => TiandituMap | null,
): () => void {
  if (typeof ResizeObserver === 'undefined') {
    return () => {}
  }

  const observer = new ResizeObserver(() => {
    const map = getMap()
    if (map) invalidateMapSize(map)
  })
  observer.observe(container)
  return () => observer.disconnect()
}

/** 多次延迟触发 checkResize，覆盖弹窗动画结束后的布局 */
export function scheduleMapResize(map: TiandituMap, delays = [0, 80, 240, 480, 800]) {
  for (const delay of delays) {
    window.setTimeout(() => invalidateMapSize(map), delay)
  }
}

/**
 * 覆盖物层不拦截鼠标，仅可交互标记响应点击。
 * SDK 的 getPanes 与 DOM class 双路径设置，避免类名不一致导致拖拽失效。
 */
export function applyOverlayPassthrough(map: TiandituMap) {
  const panes = map.getPanes?.()
  if (panes) {
    for (const [key, pane] of Object.entries(panes)) {
      if (!pane || MAP_INTERACTIVE_PANE_KEYS.has(key)) continue
      pane.style.pointerEvents = 'none'
    }
  }

  const root = map.getContainer?.()
  if (root) {
    root.querySelectorAll<HTMLElement>('[class*="tdt-"][class*="pane"]').forEach((pane) => {
      if (MAP_PASSTHROUGH_PANE_CLASS_RE.test(pane.className)) {
        pane.style.pointerEvents = 'none'
      }
    })
    root.querySelectorAll<HTMLElement>('.slake-map-school-marker').forEach((marker) => {
      marker.style.pointerEvents = 'auto'
    })
  }
}

/** 启用滚轮缩放与拖拽，并让覆盖物层不挡住地图 */
export function configureMapInteraction(map: TiandituMap) {
  invokeMapMethod(map, 'enableScrollWheelZoom')
  invokeMapMethod(map, 'enableDrag')
  invokeMapMethod(map, 'enableInertia')
  invokeMapMethod(map, 'enableAutoResize')

  const setOptions = (map as TiandituMap & { setOptions?: (opts: { drag?: boolean }) => void })
    .setOptions
  setOptions?.({ drag: true })
}

/**
 * 自定义 HTML 覆盖物会挡住 SDK 内置拖拽时，改用手动 panBy 平移。
 * 会关闭 SDK 拖拽，避免与手动平移冲突。
 */
export function bindMapDragPan(
  map: TiandituMap,
  T: NonNullable<typeof window.T>,
  options: { ignoreSelector?: string } = {},
): () => void {
  const container = map.getContainer?.()
  if (!container || !map.panBy) return () => {}
  const root: HTMLElement = container

  invokeMapMethod(map, 'disableDrag')

  const ignoreSelector =
    options.ignoreSelector ?? '.slake-map-school-marker, .slake-map-school-marker *'

  let panning = false
  let lastX = 0
  let lastY = 0
  let pendingDx = 0
  let pendingDy = 0
  let panRaf = 0

  function shouldIgnore(target: EventTarget | null) {
    return target instanceof Element && Boolean(target.closest(ignoreSelector))
  }

  function startPan(clientX: number, clientY: number) {
    panning = true
    lastX = clientX
    lastY = clientY
    root.style.cursor = 'grabbing'
  }

  function movePan(clientX: number, clientY: number) {
    if (!panning) return
    const dx = clientX - lastX
    const dy = clientY - lastY
    if (!dx && !dy) return
    lastX = clientX
    lastY = clientY
    pendingDx += dx
    pendingDy += dy
    if (panRaf) return
    panRaf = requestAnimationFrame(() => {
      panRaf = 0
      if (!pendingDx && !pendingDy) return
      map.panBy?.(new T.Point(-pendingDx, -pendingDy))
      pendingDx = 0
      pendingDy = 0
    })
  }

  function endPan() {
    if (!panning) return
    panning = false
    root.style.cursor = 'grab'
  }

  const onMouseDown = (e: MouseEvent) => {
    if (e.button !== 0 || shouldIgnore(e.target)) return
    startPan(e.clientX, e.clientY)
    e.preventDefault()
  }

  const onMouseMove = (e: MouseEvent) => {
    movePan(e.clientX, e.clientY)
  }

  const onMouseUp = () => endPan()

  const onTouchStart = (e: TouchEvent) => {
    if (shouldIgnore(e.target) || e.touches.length !== 1) return
    startPan(e.touches[0].clientX, e.touches[0].clientY)
  }

  const onTouchMove = (e: TouchEvent) => {
    if (!panning || e.touches.length !== 1) return
    movePan(e.touches[0].clientX, e.touches[0].clientY)
    e.preventDefault()
  }

  const onTouchEnd = () => endPan()

  root.style.cursor = 'grab'
  root.addEventListener('mousedown', onMouseDown)
  window.addEventListener('mousemove', onMouseMove)
  window.addEventListener('mouseup', onMouseUp)
  root.addEventListener('touchstart', onTouchStart, { passive: false })
  root.addEventListener('touchmove', onTouchMove, { passive: false })
  root.addEventListener('touchend', onTouchEnd)
  root.addEventListener('touchcancel', onTouchEnd)

  return () => {
    if (panRaf) {
      cancelAnimationFrame(panRaf)
      panRaf = 0
    }
    root.removeEventListener('mousedown', onMouseDown)
    window.removeEventListener('mousemove', onMouseMove)
    window.removeEventListener('mouseup', onMouseUp)
    root.removeEventListener('touchstart', onTouchStart)
    root.removeEventListener('touchmove', onTouchMove)
    root.removeEventListener('touchend', onTouchEnd)
    root.removeEventListener('touchcancel', onTouchEnd)
    root.style.cursor = ''
  }
}

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 = 'c0e64d52ae7934dfd448c59953559c40'

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.style.pointerEvents = 'auto'
      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
      const panes = map.getPanes?.()
      const overlayPane = panes?.overlayPane ?? panes?.markerPane
      if (overlayPane) overlayPane.appendChild(div)

      let moveRaf = 0
      this._onMapChange = () => {
        if (moveRaf) return
        moveRaf = requestAnimationFrame(() => {
          moveRaf = 0
          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 {}