/**
 * 地图助手（Mapbox）
 * replace/restore 移动 #map 容器后必须 resize()
 */
class MapHelper {
  _map = null
  _originParent = null
  _savedView = null

  setMap(map) {
    this._map = map
  }

  getMap() {
    return this._map
  }

  toggleMapMode({ is2D = false, is3D = false } = {}) {
    if (!this._map) return

    if (is3D) {
      this._map.easeTo({ pitch: 45, bearing: 0, duration: 0 })
      this._map.dragRotate.enable()
      this._map.touchZoomRotate.enableRotation()
      this._map.dragRotate.enablePitch?.()
      this._map.touchPitch?.enable?.()
    }

    if (is2D) {
      // 只锁俯仰/旋转；投影由 setProjection 单独控制
      // 监控要 globe 圆形地球，航线编辑要 mercator
      this._map.easeTo({ pitch: 0, bearing: 0, duration: 0 })
      this._map.dragRotate.disable()
      this._map.touchZoomRotate.disableRotation()
      this._map.dragRotate.disablePitch?.()
      this._map.touchPitch?.disable?.()
    }
  }

  setProjection(name) {
    if (!this._map || !name) return
    try {
      this._map.setProjection(name)
    } catch (_) {
      /* ignore */
    }
  }

  replaceMapContainer(newParent) {
    if (!this._map || !newParent) return

    const el = this._map.getContainer()
    this._originParent = this._originParent || el.parentNode
    const c = this._map.getCenter()
    this._savedView = {
      center: [c.lng, c.lat],
      zoom: this._map.getZoom(),
      pitch: this._map.getPitch(),
      bearing: this._map.getBearing(),
    }
    newParent.appendChild(el)
    this._map.resize()
  }

  restoreMapContainer() {
    if (!this._map || !this._originParent) return

    const el = this._map.getContainer()
    this._originParent.appendChild(el)

    if (this._savedView) {
      this._map.jumpTo({
        center: this._savedView.center,
        zoom: this._savedView.zoom,
        pitch: this._savedView.pitch,
        bearing: this._savedView.bearing,
      })
    }

    this._map.resize()
    this._originParent = null
    this._savedView = null
  }
}

const g = typeof globalThis !== 'undefined' ? globalThis : undefined
const singleton = (g && g.__LAIC_MAP_HELPER__) || new MapHelper()
if (g) g.__LAIC_MAP_HELPER__ = singleton

export default singleton