import * as Cesium from 'cesium'
import { MapTooltip } from './MapTooltip'
import { DrawPolygon } from './DrawPolygon'
/**
 * 飞到中心点并且所有点在可视范围
 *  @param positionsData 二维数组，每项为 [lon, lat] 或 三维数组 [lon, lat, height]
 *  @param viewer Cesium.Viewer 实例
 *  @param multiple 缩放倍数-默认为4
 *  @param pitch 俯仰角-默认为-90
 */
function flyVisual({ positionsData, viewer, multiple = 4, pitch = -90 }) {
	if (!Array.isArray(positionsData) || positionsData.length === 0) return

	// 如果是一个点，加两个点方便后续生成外包围盒
	if (positionsData.length === 1) {
		const [lon, lat, height = 0] = positionsData[0]
		positionsData = [
			[lon + 0.001, lat + 0.001, height],
			[lon - 0.001, lat - 0.001, height],
			[lon, lat, height],
		]
	}
	const positions = positionsData.map(([lon, lat, height = 0]) =>
		Cesium.Cartesian3.fromDegrees(Number(lon), Number(lat), Number(height || 0))
	)

	// 计算最高高度和中心点经纬度
	let maxHeight = -Infinity
	let sumLon = 0,
		sumLat = 0
	for (const [lon, lat, height] of positionsData) {
		sumLon += Number(lon)
		sumLat += Number(lat)
		maxHeight = Math.max(maxHeight, Number(height || 0))
	}
	const centerLon = sumLon / positionsData.length
	const centerLat = sumLat / positionsData.length
	const boundingSphere = Cesium.BoundingSphere.fromPoints(positions)
	// 暂时飞向 BoundingSphere
	viewer.camera.flyToBoundingSphere(Cesium.BoundingSphere.fromPoints(positions), {
		duration: 0,
		offset: {
			heading: Cesium.Math.toRadians(0),
			pitch: Cesium.Math.toRadians(pitch),
			range: boundingSphere.radius * multiple,
		},
		complete: () => {
			// 飞行完成后检查相机高度是否小于最高点
			const cameraHeight = Cesium.Cartographic.fromCartesian(viewer.camera.position).height
			if (cameraHeight < maxHeight) {
				viewer.camera.flyTo({
					destination: Cesium.Cartesian3.fromDegrees(centerLon, centerLat, maxHeight + 100), // 加100米缓冲
					duration: 1.5,
					orientation: {
						heading: viewer.camera.heading,
						pitch: viewer.camera.pitch,
						roll: viewer.camera.roll,
					},
				})
			}
		},
	})
}

// 批量获取点数组经纬度对应高度信息
const getPointPositionsHeight = (data, viewer, droneHeight = null) => {
	return new Promise((resolve, reject) => {
		if (!data || !data.length) {
			resolve([])
			return
		}
		// 假设 viewer 已经初始化并且 terrainProvider 是有效的
		const terrainProvider = viewer?.terrainProvider
		// 创建 Cartographic 对象
		const cartographics = data.map(item => {
			const { lng, lat } = item
			return Cesium.Cartographic.fromDegrees(Number(lng), Number(lat))
		})
		// 获取地形数据的Promise
		const promise = Cesium.sampleTerrainMostDetailed(terrainProvider, cartographics)
		// 使用 Cesium.when 处理 Promise
		promise
			.then(function (updatedPositions) {
				//  是一个数组，包含更新后的 Cartographic 对象
				const newPosition = updatedPositions.map((item, index) => {
					const longitude = Cesium.Math.toDegrees(item.longitude)
					const latitude = Cesium.Math.toDegrees(item.latitude)
					let pointData = {
						...data[index],
						longitude,
						latitude,
						ASL: Number(item.height),
						customHeight: Number(item.height),
					}
					if (droneHeight) pointData.TH = Number(item.height) + Number(droneHeight)
					return pointData
				})
				resolve(newPosition)
			})
			.catch(function (error) {
				console.log('获取高程时发生错误:', error)
				resolve(data.map(item => ({ ...item, ASL: 0, customHeight: 0, longitude: item.lng, latitude: item.lat })))
			})
	})
}

export { MapTooltip, flyVisual, getPointPositionsHeight, DrawPolygon }