import * as Cesium from 'cesium'
import * as turf from '@turf/turf'

export const getLngLatDistance = (lat1, lng1, lat2, lng2) => {
	const radLat1 = (lat1 * Math.PI) / 180.0
	const radLat2 = (lat2 * Math.PI) / 180.0
	const a = radLat1 - radLat2
	const b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0
	let s =
		2 *
		Math.asin(
			Math.sqrt(
				Math.pow(Math.sin(a / 2), 2) +
					Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)
			)
		)
	s = s * 6378.137 // EARTH_RADIUS;
	s = Math.round(s * 10000) / 10000
	return s * 1000
}

// 获取限polyline长度
export const getPolylineLength = entity => {
	let length = 0

	// 获取Polyline的所有顶点位置
	const positions = entity.polyline.positions.getValue()

	for (let i = 0; i < positions.length - 1; ++i) {
		const startPosition = positions[i]
		const endPosition = positions[i + 1]

		// 使用Cesium提供的distanceBetween函数计算两个顶点之间的距离
		const distance = Cesium.Cartesian3.distance(startPosition, endPosition)

		// 将每个顶点之间的距离相加得到总长度
		length += distance
	}

	return length
}

// 创建三角广告牌
export const createTriangleMarker = (title, color) => {
	// 创建canvas绘制广告牌
	const billboard = document.createElement('canvas')
	billboard.width = 30
	billboard.height = 30
	const ctx = billboard.getContext('2d')
	ctx.beginPath()
	ctx.moveTo(0, 0)
	ctx.lineTo(30, 0)
	ctx.lineTo(15, 22)
	ctx.fillStyle = color
	ctx.fill()
	ctx.font = '18px serif'
	ctx.fillStyle = '#ffffff'
	ctx.fillText(title, 10, 15)
	ctx.closePath()
	return billboard
}

export const createCircleBillboard = (title, color) => {
	const billboard = document.createElement('canvas')
	const ctx = billboard.getContext('2d')
	ctx.beginPath()
	ctx.ellipse(150, 90, 11, 11, 0, 0, Math.PI * 2)
	ctx.fillStyle = color
	ctx.fill()
	ctx.font = 'bold 15px serif'
	ctx.textAlign = 'center'
	ctx.fillStyle = '#ffffff'
	ctx.fillText(title, 150, 95)
	ctx.closePath()
	return billboard
}

// 获取当前经纬度海拔
export const getHaeHeight = (start, end) => {
	const ellipsoid = Cesium.Ellipsoid.WGS84 // 选择合适的椭圆体模型
	// const { longitude, latitude, height } = start
	// const { longitude: endLng, latitude: endLat, height: endHeight } = end
	// const startC3Position = new Cesium.Cartographic(longitude, latitude, height)
	// const endC3Position = new Cesium.Cartographic(endLng, endLat, endHeight)
	// const startCartesianPosition = ellipsoid.cartographicToCartesian(startC3Position)
	// const endCartesianPosition = ellipsoid.cartographicToCartesian(endC3Position)
	// // 计算两个位置之间的距离
	// const distance = new Cesium.EllipsoidGeodesic(startCartesianPosition, endCartesianPosition, ellipsoid)
	// return distance
	const { longitude, latitude, height } = end
	const cartographic = Cesium.Cartographic.fromDegrees(longitude, latitude, height)
	const cartesianPosition = ellipsoid.cartographicToCartesian(cartographic)
	const haeHeight = ellipsoid.cartesianToCartographic(cartesianPosition).height
	return haeHeight
}

// Cesium Cartesian3 转正常经纬度
export const cartesian3Convert = (cartesian3Position, viewer) => {
	// 转换为经纬度
	const ellipsoid = viewer.scene.globe.ellipsoid
	const cartographicPosition = Cesium.Cartographic.fromCartesian(cartesian3Position, ellipsoid)
	const longitude = Cesium.Math.toDegrees(cartographicPosition.longitude)
	const latitude = Cesium.Math.toDegrees(cartographicPosition.latitude)
	const height = cartographicPosition.height

	//   console.log('经度: ' + longitude);
	//   console.log('纬度: ' + latitude);
	//   console.log('高度: ' + height);

	return {
		longitude,
		latitude,
		height,
	}
}

// Cesium Cartesian2 转正常经纬度
export const cartesian2Convert = (position, viewer) => {
	const ellipsoid = viewer.scene.globe.ellipsoid
	const c3Position = viewer.scene.globe.pick(viewer.camera.getPickRay(position), viewer.scene)
	const c2Postion = ellipsoid.cartesianToCartographic(c3Position)
	const longitude = Cesium.Math.toDegrees(c2Postion.longitude)
	const latitude = Cesium.Math.toDegrees(c2Postion.latitude)
	return { longitude, latitude }
}

// 根据经纬度获取距离
export const getLnglatDist = (lng1, lat1, lng2, lat2) => {
	const start = new Cesium.Cartesian3.fromDegrees(Number(lng1), Number(lat1), 0)
	const end = new Cesium.Cartesian3.fromDegrees(Number(lng2), Number(lat2), 0)
	return Cesium.Cartesian3.distance(start, end)
}

/**
 * 地点坐标计算中心点
 * @param coordinateList {Array<Array<Object>>} [[{lat, lng}]]
 * @return { Object } {lat lng}
 */
export const getCenterPoint = coordinateList => {
	coordinateList = coordinateList.map(item => {
		const [lng, lat] = item
		return [{ lat, lng }]
	})
	const geoCoordinateListFlat = coordinateList.reduce((s, v) => {
		return (s = s.concat(v))
	}, [])
	const total = geoCoordinateListFlat.length
	let X = 0
	let Y = 0
	let Z = 0
	for (const g of geoCoordinateListFlat) {
		const lat = (g.lat * Math.PI) / 180
		const lon = (g.lng * Math.PI) / 180
		const x = Math.cos(lat) * Math.cos(lon)
		const y = Math.cos(lat) * Math.sin(lon)
		const z = Math.sin(lat)
		X += x
		Y += y
		Z += z
	}

	X = X / total
	Y = Y / total
	Z = Z / total
	const Lon = Math.atan2(Y, X)
	const Hyp = Math.sqrt(X * X + Y * Y)
	const Lat = Math.atan2(Z, Hyp)

	return { lng: (Lon * 180) / Math.PI, lat: (Lat * 180) / Math.PI }
}

/**
 * @description: 计算两组经纬度中距离最短的两个点
 * @param {*} lnglat1 [[xxx,xxx]]
 * @param {*} lnglat2 [[xxx,xxx]]
 * @return {*} { index: 1 }
 */
export const getShortestDistance = (lnglat1, lnglat2) => {
	const arr = []
	lnglat1.forEach((v, i) => {
		const [lng, lat] = v
		lnglat2.forEach((s, i2) => {
			const [vLng, vLat] = s
			const distance = getLnglatDist(lng, lat, vLng, vLat)
			arr.push({
				distance,
				index: [i, i2],
				lnglat: [v, s],
			})
		})
	})
	const newArr = arr.sort((a, b) => a.distance - b.distance)
	return newArr[0]
}

// 获取当前经纬度地形数据
export const getLnglatAltitude = (longitude, latitude, viewer) => {
	return new Promise((resolve, reject) => {
		// 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 cartographic = Cesium.Cartographic.fromDegrees(longitude, latitude)

		// 获取地形数据的Promise
		const promise = Cesium.sampleTerrainMostDetailed(terrainProvider, [cartographic])

		// 使用 Cesium.when 处理 Promise
		promise
			.then(function (updatedPositions) {
				// updatedPositions 是一个数组，包含更新后的 Cartographic 对象
				const updatedPosition = updatedPositions[0]
				const height = updatedPosition.height

				resolve({
					longitude,
					latitude,
					height,
				})
				// 在这里，你可以使用 height 值进行后续操作
			})
			.catch(function (error) {
				// console.error('获取高程时发生错误:', error);
				reject(error)
			})
	})
}

// 批量获取经纬度对应高度信息
export const getPositionsHeight = (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?.['Point']?.['coordinates']?.['#text'].split(',')

			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) {
				// 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 FinalHeight =
						Number(data[index]?.['ellipsoidHeight']?.['#text']) + Number(item.height)

					if (droneHeight) {
						FinalHeight = Number(data[index]?.['ellipsoidHeight']?.['#text']) + droneHeight
					}

					return {
						...data[index],
						longitude,
						latitude,
						FinalHeight,
						customHeight: Number(item.height),
					}
				})

				resolve(newPosition)
				// 在这里，你可以使用 height 值进行后续操作
			})
			.catch(function (error) {
				// console.error('获取高程时发生错误:', error);
				reject(error)
			})
	})
}

// 获取面中最高点
export const getPolygonMaxHeight = (turfPolygon, viewer) => {
	return new Promise((resolve, reject) => {
		const turfExtent = turf.bbox(turfPolygon)

		const turfSamplePoints = turf.pointGrid(turfExtent, 0.01, {
			units: 'kilometers',
			mask: turfPolygon,
		})

		// 假设 viewer 已经初始化并且 terrainProvider 是有效的
		const terrainProvider = viewer?.terrainProvider

		const cesiumSamplePoints = []
		for (let i = 0; i < turfSamplePoints.features.length; i++) {
			const coord = turfSamplePoints.features[i].geometry.coordinates
			cesiumSamplePoints.push(Cesium.Cartographic.fromDegrees(coord[0], coord[1]))
		}

		// 获取地形数据的Promise
		const promise = Cesium.sampleTerrainMostDetailed(terrainProvider, cesiumSamplePoints)

		promise
			.then(function (updatedPositions) {
				const newPosition = updatedPositions.map(item => Number(item.height))

				resolve(Math.max(...newPosition))
			})
			.catch(function (error) {
				reject(error)
			})
	})
}

// 展示当前的高度
export const getWaylineShowHeight = positions => {
	const { lng, lat } = getCenterPoint(positions)
	let maxDist = 0
	positions.forEach(item => {
		const [lng1, lat1] = item
		let pointsDist = getLnglatDist(lng1, lat1, lng, lat)
		if (pointsDist > maxDist) {
			maxDist = pointsDist
		}
	})
	return {
		lng,
		lat,
		showHeight: maxDist * 8,
	}
}

// 获取当前面是否有交叉点
export const isIntersection = coordinates => {
	const polyDikuai = turf.polygon([coordinates])
	const result = turf.kinks(polyDikuai)
	const resultFeatures = result.features
	if (resultFeatures.length == 0) {
		//无相交
		return false
	} else {
		//有相交
		return true
	}
}

/**
 * 飞到中心点并且所有点在可视范围
 * @param lngLatArr
 * @param viewer
 * @param rangeMultiple 范围倍数越大飞的越高默认2
 */
export function flyVisual(lngLatArr,viewer,rangeMultiple = 2) {
	if (!Array.isArray(lngLatArr) || lngLatArr.length === 0) return
	const positions = lngLatArr.map(([lon, lat]) =>
		Cesium.Cartesian3.fromDegrees(Number(lon), Number(lat))
	)
	// 计算包围盒 BoundingSphere（所有点的外接球）
	const boundingSphere = Cesium.BoundingSphere.fromPoints(positions)
	viewer.camera.flyToBoundingSphere(boundingSphere, {
		duration: 0,
		offset: new Cesium.HeadingPitchRange(0, 0, boundingSphere.radius * rangeMultiple),
	})
}

// 获取视口地图中心点
export function getMapCenterPoint(viewer) {
	const centerResult = viewer.camera.pickEllipsoid(
		new Cesium.Cartesian2(
			viewer.canvas.clientWidth / 2,
			viewer.canvas.clientHeight / 2
		)
	);
	const curPosition = Cesium.Ellipsoid.WGS84.cartesianToCartographic(centerResult);
	const longitude = (curPosition.longitude * 180) / Math.PI;
	const latitude = (curPosition.latitude * 180) / Math.PI;
	return { longitude, latitude };
}