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

/**
 * 线缩放通用方法
 * @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
 * @param multiple 缩放倍数
 */
export const lineTransformScale = (data, multiple = 3) => {
	const line = turf.lineString(data)
	const scaledLine = turf.transformScale(line, multiple)

	return scaledLine.geometry.coordinates
}

/**
 * 盒子缩放通用方法
 * @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
 * @param multiple 缩放倍数
 */
export const boxTransformScale = (data, multiple = 3) => {
	const line = turf.lineString(data)
	const bbox = turf.bbox(line)
	const bboxPolygon = turf.bboxPolygon(bbox)
	const scaledPolygon = turf.transformScale(bboxPolygon, multiple)

	return turf.bbox(scaledPolygon)
}

/**
 * 获取盒子中心点
 * @param {*} data 
 * @returns 
 */
export const boxCenterPosition = (data) => {
	const line = turf.lineString(data)
	const bbox = turf.bbox(line)
	const bboxPolygon = turf.bboxPolygon(bbox)

	return turf.center(bboxPolygon).geometry.coordinates
}

/**
 * 获取多点间，最大点到点距离
 * @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
 * @param center 面的中心点 格式 [lng, lat]
 */
export const morePointMaxLength = (data, center, type = 1) => {
	if (type === 2) {
		let maxLength = 0
		const centerCartesian = Cesium.Cartesian3.fromDegrees(center[0], center[1], 0)

		data.forEach(pos => {
			const posCartesian = Cesium.Cartesian3.fromDegrees(pos[0], pos[1], pos[2] || 0)
			const distance = Cesium.Cartesian3.distance(centerCartesian, posCartesian)
			if (distance > maxLength) {
				maxLength = distance
			}
		})

		return maxLength
	}

	const arr = data.reduce((pre, cur) => {
		let from = turf.point(center)
		let to = turf.point(cur)
		let options = { units: "kilometers" }

		let distance = turf.distance(from, to, options) // 60.35329997171415

		pre.push(distance)

		return pre
	}, [])

	return (Math.max(...arr) * 1000 + 500)
}