import { MapEngine, type MapEngineStageRect, type MapEngineViewState } from '../../engine/map/mapEngine'

type MapPageData = MapEngineViewState & {
  showDebugPanel: boolean
}

const INTERNAL_BUILD_VERSION = 'map-build-63'

let mapEngine: MapEngine | null = null

function getFallbackStageRect(): MapEngineStageRect {
  const systemInfo = wx.getSystemInfoSync()
  const width = Math.max(320, systemInfo.windowWidth - 20)
  const height = Math.max(280, Math.floor(systemInfo.windowHeight * 0.66))

  return {
    width,
    height,
    left: 10,
    top: 0,
  }
}

Page({
  data: { showDebugPanel: false } as MapPageData,

  onLoad() {
    mapEngine = new MapEngine(INTERNAL_BUILD_VERSION, {
      onData: (patch) => {
        this.setData(patch)
      },
    })

    this.setData({ ...mapEngine.getInitialData(), showDebugPanel: false })
  },

  onReady() {
    this.measureStageAndCanvas()
  },

  onUnload() {
    if (mapEngine) {
      mapEngine.destroy()
      mapEngine = null
    }
  },

  measureStageAndCanvas() {
    const page = this
    const applyStage = (rawRect?: Partial<WechatMiniprogram.BoundingClientRectCallbackResult>) => {
      const fallbackRect = getFallbackStageRect()
      const rect: MapEngineStageRect = {
        width: rawRect && typeof rawRect.width === 'number' ? rawRect.width : fallbackRect.width,
        height: rawRect && typeof rawRect.height === 'number' ? rawRect.height : fallbackRect.height,
        left: rawRect && typeof rawRect.left === 'number' ? rawRect.left : fallbackRect.left,
        top: rawRect && typeof rawRect.top === 'number' ? rawRect.top : fallbackRect.top,
      }

      const currentEngine = mapEngine
      if (!currentEngine) {
        return
      }

      currentEngine.setStage(rect)

      const canvasQuery = wx.createSelectorQuery().in(page)
      canvasQuery.select('#mapCanvas').fields({ node: true, size: true })
      canvasQuery.exec((canvasRes) => {
        const canvasRef = canvasRes[0] as any
        if (!canvasRef || !canvasRef.node) {
          page.setData({
            statusText: `WebGL 引擎初始化失败 (${INTERNAL_BUILD_VERSION})`,
          })
          return
        }

        const dpr = wx.getSystemInfoSync().pixelRatio || 1
        try {
          currentEngine.attachCanvas(canvasRef.node, rect.width, rect.height, dpr)
        } catch (error) {
          page.setData({
            statusText: `WebGL 初始化失败 (${INTERNAL_BUILD_VERSION})`,
          })
        }
      })
    }

    const query = wx.createSelectorQuery().in(page)
    query.select('.map-stage').boundingClientRect()
    query.exec((res) => {
      const rect = res[0] as WechatMiniprogram.BoundingClientRectCallbackResult | undefined
      applyStage(rect)
    })
  },

  handleTouchStart(event: WechatMiniprogram.TouchEvent) {
    if (mapEngine) {
      mapEngine.handleTouchStart(event)
    }
  },

  handleTouchMove(event: WechatMiniprogram.TouchEvent) {
    if (mapEngine) {
      mapEngine.handleTouchMove(event)
    }
  },

  handleTouchEnd(event: WechatMiniprogram.TouchEvent) {
    if (mapEngine) {
      mapEngine.handleTouchEnd(event)
    }
  },

  handleTouchCancel() {
    if (mapEngine) {
      mapEngine.handleTouchCancel()
    }
  },

  handleRecenter() {
    if (mapEngine) {
      mapEngine.handleRecenter()
    }
  },

  handleRotateStep() {
    if (mapEngine) {
      mapEngine.handleRotateStep()
    }
  },

  handleRotationReset() {
    if (mapEngine) {
      mapEngine.handleRotationReset()
    }
  },

  handleSetManualMode() {
    if (mapEngine) {
      mapEngine.handleSetManualMode()
    }
  },

  handleSetNorthUpMode() {
    if (mapEngine) {
      mapEngine.handleSetNorthUpMode()
    }
  },

  handleSetHeadingUpMode() {
    if (mapEngine) {
      mapEngine.handleSetHeadingUpMode()
    }
  },

  handleAutoRotateCalibrate() {
    if (mapEngine) {
      mapEngine.handleAutoRotateCalibrate()
    }
  },

  handleToggleDebugPanel() {
    this.setData({
      showDebugPanel: !this.data.showDebugPanel,
    })
  },
})