import { BBox } from "./BBox"
import * as turf from "@turf/turf"
import { AllGeoJSON, booleanWithin, Coord } from "@turf/turf"
import {
    Feature,
    FeatureCollection,
    GeoJSON,
    LineString,
    MultiLineString,
    MultiPolygon,
    Point,
    Polygon,
    Position,
} from "geojson"
import { Tiles } from "../Models/TileRange"
import { Utils } from "../Utils"

;("use strict")

export class GeoOperations {
    private static readonly _earthRadius: number = 6378137
    private static readonly _originShift: number = (2 * Math.PI * GeoOperations._earthRadius) / 2
    private static readonly directions = ["N", "NE", "E", "SE", "S", "SW", "W", "NW"] as const
    private static readonly directionsRelative = [
        "straight",
        "slight_right",
        "right",
        "sharp_right",
        "behind",
        "sharp_left",
        "left",
        "slight_left",
    ] as const
    private static reverseBearing = {
        N: 0,
        NNE: 22.5,
        NE: 45,
        ENE: 67.5,
        E: 90,
        ESE: 112.5,
        SE: 135,
        SSE: 157.5,
        S: 180,
        SSW: 202.5,
        SW: 225,
        WSW: 247.5,
        W: 270,
        WNW: 292.5,
        NW: 315,
        NNW: 337.5,
    }

    /**
     * Create a union between two features
     */
    public static union(
        f0: Feature<Polygon | MultiPolygon>,
        f1: Feature<Polygon | MultiPolygon>
    ): Feature<Polygon | MultiPolygon> | null {
        return turf.union(turf.featureCollection([f0, f1]))
    }

    public static intersect(
        f0: Readonly<Feature<Polygon | MultiPolygon>>,
        f1: Readonly<Feature<Polygon | MultiPolygon>>
    ): Feature<Polygon | MultiPolygon> | null {
        return turf.intersect(turf.featureCollection([f0, f1]))
    }

    static surfaceAreaInSqMeters(feature: Feature<Polygon | MultiPolygon>): number {
        return turf.area(feature)
    }

    /**
     * Converts a GeoJson feature to a point GeoJson feature
     * @param feature
     */
    static centerpoint(feature: Feature): Feature<Point> {
        const newFeature: Feature<Point> = turf.center(feature)
        newFeature.properties = feature.properties
        newFeature.id = feature.id
        return newFeature
    }

    /**
     * Returns [lon,lat] coordinates.
     * @param feature
     *
     * GeoOperations.centerpointCoordinates(undefined) // => undefined
     */
    static centerpointCoordinates(feature: undefined | null): undefined
    static centerpointCoordinates(
        feature: AllGeoJSON | GeoJSON | undefined
    ): [number, number] | undefined
    static centerpointCoordinates(
        feature: NonNullable<AllGeoJSON> | NonNullable<GeoJSON>
    ): NonNullable<[number, number]>
    static centerpointCoordinates(feature: AllGeoJSON | GeoJSON): [number, number] {
        if (feature === undefined || feature === null) {
            return undefined
        }
        return <[number, number]>turf.center(feature).geometry.coordinates
    }

    /**
     * Returns the distance between the two points in meters
     * @param lonlat0
     * @param lonlat1
     */
    static distanceBetween(
        lonlat0: [number, number] | Coord | Position,
        lonlat1: [number, number] | Position | Coord
    ) {
        return turf.distance(lonlat0, lonlat1, { units: "meters" })
    }

    /**
     * Starting on `from`, travels `distance` meters in the direction of the `bearing` (default: 90)
     */
    static destination(
        from: Coord | [number, number],
        distance: number,
        bearing: number = 90
    ): [number, number] {
        return <[number, number]>(
            turf.destination(from, distance, bearing, { units: "meters" }).geometry.coordinates
        )
    }

    static convexHull(featureCollection, options: { concavity?: number }) {
        return turf.convex(featureCollection, options)
    }

    /**
     * Calculates the overlap of 'feature' with every other specified feature.
     * The features with which 'feature' overlaps, are returned together with their overlap area in m²
     *
     * If 'feature' is a LineString, the features in which this feature is (partly) embedded is returned, the overlap length in meter is given
     * If 'feature' is a Polygon, overlapping points and points within the polygon will be returned
     *
     * If 'feature' is a point, it will return every feature the point is embedded in. Overlap will be undefined
     *
     * const polygon = {"type": "Feature","properties": {},"geometry": {"type": "Polygon","coordinates": [[[1.8017578124999998,50.401515322782366],[-3.1640625,46.255846818480315],[5.185546875,44.74673324024678],[1.8017578124999998,50.401515322782366]]]}};
     * const point = {"type": "Feature", "properties": {}, "geometry": { "type": "Point", "coordinates": [2.274169921875, 46.76244305208004]}};
     * const overlap = GeoOperations.calculateOverlap(point, [polygon]);
     * overlap.length // => 1
     * overlap[0].feat == polygon // => true
     * const line = {"type": "Feature","properties": {},"geometry": {"type": "LineString","coordinates": [[3.779296875,48.777912755501845],[1.23046875,47.60616304386874]]}};
     * const lineOverlap = GeoOperations.calculateOverlap(line, [polygon]);
     * lineOverlap.length // => 1
     * lineOverlap[0].overlap // => 158835.70531134616
     * lineOverlap[0].feat == polygon // => true
     * const line0 = {"type": "Feature","properties": {},"geometry": {"type": "LineString","coordinates": [[0.0439453125,47.31648293428332],[0.6591796875,46.77749276376827]]}};
     * const overlap0 = GeoOperations.calculateOverlap(line0, [polygon]);
     * overlap.length // => 1
     */
    static calculateOverlap(
        feature: Feature,
        otherFeatures: Feature[]
    ): { feat: Feature; overlap: number }[] {
        const featureBBox = BBox.get(feature)
        const result: { feat: Feature; overlap: number }[] = []
        if (feature.geometry.type === "Point") {
            const coor = <[number, number]>(<Feature<Point>>feature).geometry.coordinates
            for (const otherFeature of otherFeatures) {
                if (
                    feature.properties.id !== undefined &&
                    feature.properties.id === otherFeature.properties.id
                ) {
                    continue
                }

                if (otherFeature.geometry === undefined) {
                    console.error("No geometry for feature ", feature)
                    throw "List of other features contains a feature without geometry an undefined"
                }

                if (GeoOperations.inside(coor, otherFeature)) {
                    result.push({ feat: otherFeature, overlap: undefined })
                }
            }
            return result
        }

        if (feature.geometry.type === "LineString") {
            for (const otherFeature of otherFeatures) {
                if (
                    feature.properties.id !== undefined &&
                    feature.properties.id === otherFeature.properties.id
                ) {
                    continue
                }

                const intersection = GeoOperations.calculateIntersection(
                    feature,
                    otherFeature,
                    featureBBox
                )
                if (intersection === null) {
                    continue
                }
                result.push({ feat: otherFeature, overlap: intersection })
            }
            return result
        }

        if (feature.geometry.type === "Polygon" || feature.geometry.type === "MultiPolygon") {
            for (const otherFeature of otherFeatures) {
                if (
                    feature.properties.id !== undefined &&
                    feature.properties.id === otherFeature.properties.id
                ) {
                    continue
                }

                if (otherFeature.geometry.type === "Point") {
                    if (this.inside(<Feature<Point>>otherFeature, feature)) {
                        result.push({ feat: otherFeature, overlap: undefined })
                    }
                    continue
                }

                // Calculate the surface area of the intersection

                const intersection = this.calculateIntersection(feature, otherFeature, featureBBox)
                if (intersection === null) {
                    continue
                }
                result.push({ feat: otherFeature, overlap: intersection })
            }
            return result
        }
        console.error(
            "Could not correctly calculate the overlap of ",
            feature,
            ": unsupported type"
        )
        return result
    }

    /**
     * Detect whether or not the given point is located in the feature
     *
     * // Should work with a normal polygon
     * const polygon = {"type": "Feature","properties": {},"geometry": {"type": "Polygon","coordinates": [[[1.8017578124999998,50.401515322782366],[-3.1640625,46.255846818480315],[5.185546875,44.74673324024678],[1.8017578124999998,50.401515322782366]]]}};
     * GeoOperations.inside([3.779296875, 48.777912755501845], polygon) // => false
     * GeoOperations.inside([1.23046875, 47.60616304386874], polygon) // => true
     *
     * // should work with a multipolygon and detect holes
     * const multiPolygon = {"type": "Feature", "properties": {},
     *         "geometry": {
     *             "type": "MultiPolygon",
     *             "coordinates": [[
     *                 [[1.8017578124999998,50.401515322782366],[-3.1640625,46.255846818480315],[5.185546875,44.74673324024678],[1.8017578124999998,50.401515322782366]],
     *                 [[1.0107421875,48.821332549646634],[1.329345703125,48.25394114463431],[1.988525390625,48.71271258145237],[0.999755859375,48.86471476180277],[1.0107421875,48.821332549646634]]
     *             ]]
     *         }
     *     };
     * GeoOperations.inside([2.515869140625, 47.37603463349758], multiPolygon) // => true
     * GeoOperations.inside([1.42822265625, 48.61838518688487], multiPolygon) // => false
     * GeoOperations.inside([4.02099609375, 47.81315451752768], multiPolygon) // => false
     */
    public static inside(
        pointCoordinate: [number, number] | Feature<Point>,
        feature: Feature
    ): boolean {
        // ray-casting algorithm based on
        // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html

        if (feature.geometry.type === "Point") {
            // The feature that should 'contain' pointCoordinate is a point itself, so it cannot contain anything
            return false
        }

        if (pointCoordinate["geometry"] !== undefined) {
            pointCoordinate = pointCoordinate["geometry"].coordinates
        }

        const x: number = pointCoordinate[0]
        const y: number = pointCoordinate[1]

        if (feature.geometry.type === "MultiPolygon") {
            const coordinatess: [number, number][][][] = <[number, number][][][]>(
                (<Feature<MultiPolygon>>feature).geometry.coordinates
            )
            for (const coordinates of coordinatess) {
                const inThisPolygon = GeoOperations.pointInPolygonCoordinates(x, y, coordinates)
                if (inThisPolygon) {
                    return true
                }
            }
            return false
        }

        if (feature.geometry.type === "Polygon") {
            return GeoOperations.pointInPolygonCoordinates(
                x,
                y,
                <[number, number][][]>(<Feature<Polygon>>feature).geometry.coordinates
            )
        }

        throw "GeoOperations.inside: unsupported geometry type " + feature.geometry.type
    }

    static lengthInMeters(feature: Feature): number {
        return turf.length(feature) * 1000
    }

    static buffer(
        feature: Feature,
        bufferSizeInMeter: number
    ): Feature<Polygon | MultiPolygon> | FeatureCollection<Polygon | MultiPolygon> {
        return turf.buffer(feature, bufferSizeInMeter / 1000, {
            units: "kilometers",
        })
    }

    static bbox(feature: AllGeoJSON): Feature<LineString> {
        const [lon, lat, lon0, lat0] = turf.bbox(feature)
        return {
            type: "Feature",
            properties: {},
            geometry: {
                type: "LineString",
                coordinates: [
                    [lon, lat],
                    [lon0, lat],
                    [lon0, lat0],
                    [lon, lat0],
                    [lon, lat],
                ],
            },
        }
    }

    /**
     * Generates the closest point on a way from a given point.
     * If the passed-in geojson object is a polygon, the outer ring will be used as linestring
     *
     *  The properties object will contain three values:
     // - `index`: closest point was found on nth line part,
     // - `dist`: distance between pt and the closest point (in kilometer),
     // `location`: distance along the line between start (of the line) and the closest point.
     * @param way The road on which you want to find a point
     * @param point Point defined as [lon, lat]
     */
    public static nearestPoint(
        way: Feature<LineString>,
        point: [number, number]
    ): Feature<
        Point,
        { dist: number; index: number; multiFeatureIndex: number; location: number }
    > {
        return turf.nearestPointOnLine(<Feature<LineString>>way, point, { units: "kilometers" })
    }

    /**
     * Helper method to reuse the coordinates of the way as LineString.
     * Mostly used as helper for 'nearestPoint'
     * @param way
     */
    public static forceLineString(way: Feature<LineString | Polygon>): Feature<LineString>[]

    public static forceLineString(
        way: Feature<MultiLineString | MultiPolygon>
    ): Feature<MultiLineString>[]

    public static forceLineString(
        way: Feature<LineString | MultiLineString | Polygon | MultiPolygon>
    ): Feature<LineString | MultiLineString>[] {
        if (way.geometry.type === "Polygon") {
            const poly: Feature<Polygon> = <Feature<Polygon>>way
            return poly.geometry.coordinates.map((linestringCoors, i) => {
                return <Feature<LineString>>{
                    type: "Feature",
                    geometry: {
                        type: "LineString",
                        coordinates: linestringCoors,
                    },
                    properties: way.properties,
                }
            })
        }
        if (way.geometry.type === "MultiPolygon") {
            const mpoly: Feature<MultiPolygon> = <Feature<MultiPolygon>>way

            return [].concat(
                ...mpoly.geometry.coordinates.map((linestrings) =>
                    [].concat(
                        ...linestrings.map(
                            (linestring) =>
                                <Feature<LineString>>{
                                    type: "Feature",
                                    geometry: {
                                        type: "LineString",
                                        coordinates: linestring,
                                    },
                                    properties: way.properties,
                                }
                        )
                    )
                )
            )
        }
        if (way.geometry.type === "LineString") {
            return [<Feature<LineString>>way]
        }
        if (way.geometry.type === "MultiLineString") {
            return [<Feature<MultiLineString>>way]
        }
        throw "Invalid geometry to create a way from this"
    }

    public static toCSV(
        features: Feature[] | FeatureCollection,
        options?: {
            ignoreTags?: RegExp
        }
    ): string {
        const headerValuesSeen = new Set<string>()
        const headerValuesOrdered: string[] = []

        function addH(key: string) {
            if (options?.ignoreTags) {
                if (key.match(options.ignoreTags)) {
                    return
                }
            }
            if (!headerValuesSeen.has(key)) {
                headerValuesSeen.add(key)
                headerValuesOrdered.push(key)
            }
        }

        addH("_lat")
        addH("_lon")

        const lines: string[] = []

        let _features
        if (Array.isArray(features)) {
            _features = features
        } else {
            _features = features.features
        }

        for (const feature of _features) {
            const properties = feature.properties
            for (const key in properties) {
                addH(key)
            }
        }
        headerValuesOrdered.sort()
        for (const feature of _features) {
            const properties = feature.properties
            let line = ""
            for (const key of headerValuesOrdered) {
                const value = properties[key]
                if (value === undefined) {
                    line += ","
                } else {
                    line += JSON.stringify(value) + ","
                }
            }
            lines.push(line)
        }

        return headerValuesOrdered.map((v) => JSON.stringify(v)).join(",") + "\n" + lines.join("\n")
    }

    //Converts given lat/lon in WGS84 Datum to XY in Spherical Mercator EPSG:900913
    public static ConvertWgs84To900913(lonLat: [number, number]): [number, number] {
        const lon = lonLat[0]
        const lat = lonLat[1]
        const x = (lon * GeoOperations._originShift) / 180
        let y = Math.log(Math.tan(((90 + lat) * Math.PI) / 360)) / (Math.PI / 180)
        y = (y * GeoOperations._originShift) / 180
        return [x, y]
    }

    //Converts XY point from (Spherical) Web Mercator EPSG:3785 (unofficially EPSG:900913) to lat/lon in WGS84 Datum
    public static Convert900913ToWgs84(lonLat: [number, number]): [number, number] {
        const lon = lonLat[0]
        const lat = lonLat[1]
        const x = (180 * lon) / GeoOperations._originShift
        let y = (180 * lat) / GeoOperations._originShift
        y = (180 / Math.PI) * (2 * Math.atan(Math.exp((y * Math.PI) / 180)) - Math.PI / 2)
        return [x, y]
    }

    public static GeoJsonToWGS84(geojson) {
        return turf.toWgs84(geojson)
    }

    /**
     * Tries to remove points which do not contribute much to the general outline.
     * Points for which the angle is ~ 180° are removed
     * @param coordinates
     * @constructor
     */
    public static SimplifyCoordinates(coordinates: [number, number][]) {
        const newCoordinates = []
        for (let i = 1; i < coordinates.length - 1; i++) {
            const coordinate = coordinates[i]
            const prev = coordinates[i - 1]
            const next = coordinates[i + 1]
            const b0 = turf.bearing(prev, coordinate, { final: true })
            const b1 = turf.bearing(coordinate, next)

            const diff = Math.abs(b1 - b0)
            if (diff < 2) {
                continue
            }
            newCoordinates.push(coordinate)
        }
        return newCoordinates
    }

    /**
     * Calculates line intersection between two features.
     */
    public static LineIntersections(
        feature: Feature<LineString | MultiLineString | Polygon | MultiPolygon>,
        otherFeature: Feature<LineString | MultiLineString | Polygon | MultiPolygon>
    ): [number, number][] {
        return turf
            .lineIntersect(feature, otherFeature)
            .features.map((p) => <[number, number]>p.geometry.coordinates)
    }

    /**
     * Given a list of features, will construct a map of slippy map tile-indices.
     * Features of which the BBOX overlaps with the corresponding slippy map tile are added to the corresponding array
     *
     * Also @see clipAllInBox
     * @param features
     * @param zoomlevel
     */
    public static spreadIntoBboxes(features: Feature[], zoomlevel: number): Map<number, Feature[]> {
        const perBbox = new Map<number, Feature[]>()

        for (const feature of features) {
            const bbox = BBox.get(feature)
            const tilerange = bbox.expandToTileBounds(zoomlevel).containingTileRange(zoomlevel)
            Tiles.MapRange(tilerange, (x, y) => {
                const tileNumber = Tiles.tile_index(zoomlevel, x, y)
                let newFeatureList = perBbox.get(tileNumber)
                if (newFeatureList === undefined) {
                    newFeatureList = []
                    perBbox.set(tileNumber, newFeatureList)
                }
                newFeatureList.push(feature)
            })
        }

        return perBbox
    }

    /**
     * Given a list of features, returns a new list of features so that the features are clipped into the given tile-index.
     * Note: IDs are rewritten
     * Also @see spreadIntoBBoxes
     */
    public static clipAllInBox(
        features: ReadonlyArray<Readonly<Feature>>,
        tileIndex: number
    ): Feature[] {
        const bbox = Tiles.asGeojson(tileIndex)
        const newFeatures: Feature[] = []
        for (const f of features) {
            const intersectionParts = GeoOperations.clipWith(f, bbox)
            for (let i = 0; i < intersectionParts.length; i++) {
                const intersectionPart = intersectionParts[i]
                let id = (f.properties?.id ?? "") + "_" + tileIndex
                if (i > 0) {
                    id += "_part_" + i
                }
                const properties = {
                    ...f.properties,
                    id,
                }
                intersectionPart.properties = properties
                newFeatures.push(intersectionPart)
            }
        }
        return Utils.NoNull(newFeatures)
    }

    public static toGpx(
        locations:
            | Feature<LineString>
            | Feature<Point, { date?: string; altitude?: number | string }>[],
        title?: string
    ) {
        title = title?.trim()
        if (title === undefined || title === "") {
            title = "Uploaded with MapComplete"
        }
        title = Utils.EncodeXmlValue(title)
        const trackPoints: string[] = []
        let locationsWithMeta: Feature<Point>[]
        if (Array.isArray(locations)) {
            locationsWithMeta = locations
        } else {
            locationsWithMeta = locations.geometry.coordinates.map(
                (p) =>
                    <Feature<Point>>{
                        type: "Feature",
                        properties: {},
                        geometry: {
                            type: "Point",
                            coordinates: p,
                        },
                    }
            )
        }
        for (const l of locationsWithMeta) {
            let trkpt = `    <trkpt lat="${l.geometry.coordinates[1]}" lon="${l.geometry.coordinates[0]}">`
            if (l.properties.date) {
                trkpt += `        <time>${l.properties.date}</time>`
            }
            if (l.properties.altitude) {
                trkpt += `        <ele>${l.properties.altitude}</ele>`
            }
            trkpt += "    </trkpt>"
            trackPoints.push(trkpt)
        }
        const header =
            '<gpx version="1.1" creator="mapcomplete.org" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">'
        return (
            header +
            "\n<name>" +
            title +
            "</name>\n<trk><trkseg>\n" +
            trackPoints.join("\n") +
            "\n</trkseg></trk></gpx>"
        )
    }

    /**
     * Given a list of points, convert into a GPX-list, e.g. for favourites
     * @param locations
     * @param title
     */
    public static toGpxPoints(
        locations: Feature<Point, { date?: string; altitude?: number | string }>[],
        title?: string
    ) {
        title = title?.trim()
        if (title === undefined || title === "") {
            title = "Created with MapComplete"
        }
        title = Utils.EncodeXmlValue(title)
        const trackPoints: string[] = []
        for (const l of locations) {
            let trkpt = `    <wpt lat="${l.geometry.coordinates[1]}" lon="${l.geometry.coordinates[0]}">`
            for (const key in l.properties) {
                const keyCleaned = key.replaceAll(":", "__")
                trkpt += `        <${keyCleaned}>${l.properties[key]}</${keyCleaned}>\n`
                if (key === "website") {
                    trkpt += `        <link>${l.properties[key]}</link>\n`
                }
            }
            trkpt += "    </wpt>\n"
            trackPoints.push(trkpt)
        }
        const header =
            '<gpx version="1.1" creator="mapcomplete.org" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">'
        return (
            header +
            "\n<name>" +
            title +
            "</name>\n<trk><trkseg>\n" +
            trackPoints.join("\n") +
            "\n</trkseg></trk></gpx>"
        )
    }

    /**
     * Removes points that do not contribute to the geometry from linestrings and the outer ring of polygons.
     * Returs a new copy of the feature
     *
     * const feature = {"geometry": {"type": "Polygon","coordinates": [[[4.477944199999975,51.02783550000022],[4.477987899999996,51.027818800000034],[4.478004500000021,51.02783399999988],[4.478025499999962,51.02782489999994],[4.478079099999993,51.027873899999896],[4.47801040000006,51.027903799999955],[4.477964799999972,51.02785709999982],[4.477964699999964,51.02785690000006],[4.477944199999975,51.02783550000022]]]}}
     * const copy = GeoOperations.removeOvernoding(feature)
     * expect(copy.geometry.coordinates[0]).deep.equal([[4.477944199999975,51.02783550000022],[4.477987899999996,51.027818800000034],[4.478004500000021,51.02783399999988],[4.478025499999962,51.02782489999994],[4.478079099999993,51.027873899999896],[4.47801040000006,51.027903799999955],[4.477944199999975,51.02783550000022]])
     */
    static removeOvernoding(feature: Feature<LineString | Polygon>) {
        if (feature.geometry.type !== "LineString" && feature.geometry.type !== "Polygon") {
            throw "Overnode removal is only supported on linestrings and polygons"
        }

        const copy = {
            ...feature,
            geometry: { ...feature.geometry },
        }
        let coordinates: [number, number][]
        if (feature.geometry.type === "LineString") {
            coordinates = <[number, number][]>[...feature.geometry.coordinates]
            copy.geometry.coordinates = coordinates
        } else {
            coordinates = <[number, number][]>[...feature.geometry.coordinates[0]]
            copy.geometry.coordinates[0] = coordinates
        }

        // inline replacement in the coordinates list
        for (let i = coordinates.length - 2; i >= 1; i--) {
            const coordinate = coordinates[i]
            const nextCoordinate = coordinates[i + 1]
            const prevCoordinate = coordinates[i - 1]

            const distP = GeoOperations.distanceBetween(coordinate, prevCoordinate)
            if (distP < 0.1) {
                coordinates.splice(i, 1)
                continue
            }

            if (i == coordinates.length - 2) {
                const distN = GeoOperations.distanceBetween(coordinate, nextCoordinate)
                if (distN < 0.1) {
                    coordinates.splice(i, 1)
                    continue
                }
            }

            const bearingN = turf.bearing(coordinate, nextCoordinate)
            const bearingP = turf.bearing(prevCoordinate, coordinate)
            const diff = Math.abs(bearingN - bearingP)
            if (diff < 4) {
                // If the diff is low, this point is hardly relevant
                coordinates.splice(i, 1)
            } else if (360 - diff < 4) {
                // In case that the line is going south, e.g. bearingN = 179, bearingP = -179
                coordinates.splice(i, 1)
            }
        }
        return copy
    }

    /**
     * Takes two points and finds the geographic bearing between them, i.e. the angle measured in degrees from the north line (0 degrees)
     */
    public static bearing(a: Coord, b: Coord): number {
        return turf.bearing(a, b)
    }

    public static along(a: Coord, b: Coord, distanceMeter: number): Coord {
        return turf.along(
            <Feature<LineString>>{
                type: "Feature",
                geometry: {
                    type: "LineString",
                    coordinates: [a, b],
                },
            },
            distanceMeter,
            { units: "meters" }
        ).geometry.coordinates
    }

    /**
     * Returns 'true' if one feature contains the other feature
     *
     * const pond: Feature<Polygon, any> = {
     *       "type": "Feature",
     *       "properties": {"natural":"water","water":"pond"},
     *       "geometry": {
     *         "type": "Polygon",
     *         "coordinates": [[
     *             [4.362924098968506,50.8435422298544 ],
     *             [4.363272786140442,50.8435219059949 ],
     *             [4.363213777542114,50.8437420806679 ],
     *             [4.362924098968506,50.8435422298544 ]
     *           ]]}}
     * const park: Feature<Polygon, any> =   {
     *       "type": "Feature",
     *       "properties": {"leisure":"park"},
     *       "geometry": {
     *         "type": "Polygon",
     *         "coordinates": [[
     *            [ 4.36073541641235,50.84323737103244 ],
     *            [ 4.36469435691833, 50.8423905305197 ],
     *            [ 4.36659336090087, 50.8458997374786 ],
     *            [ 4.36254858970642, 50.8468007074916 ],
     *            [ 4.36073541641235, 50.8432373710324 ]
     *           ]]}}
     * GeoOperations.completelyWithin(pond, park) // => true
     * GeoOperations.completelyWithin(park, pond) // => false
     */
    static completelyWithin(
        feature: Readonly<Feature>,
        possiblyEnclosingFeature: Readonly<Feature<Polygon | MultiPolygon>>
    ): boolean {
        if (feature.geometry.type === "MultiPolygon") {
            const polygons = feature.geometry.coordinates.map(
                (coordinates) =>
                    <Feature<Polygon>>{
                        type: "Feature",
                        geometry: {
                            type: "Polygon",
                            coordinates,
                        },
                    }
            )
            return !polygons.some((polygon) => !booleanWithin(polygon, possiblyEnclosingFeature))
        }
        return booleanWithin(feature, possiblyEnclosingFeature)
    }

    /**
     * Create an intersection between two features.
     * One or multiple new feature are returned based on 'toSplit', which'll have a geometry that is completely withing boundary
     */
    public static clipWith(
        toSplit: Readonly<Feature>,
        boundary: Readonly<Feature<Polygon>>
    ): Feature[] {
        if (toSplit.geometry.type === "Point") {
            const p = <Feature<Point>>toSplit
            if (GeoOperations.inside(<[number, number]>p.geometry.coordinates, boundary)) {
                return [p]
            } else {
                return []
            }
        }

        if (toSplit.geometry.type === "LineString") {
            const splitup: Feature<LineString>[] = turf.lineSplit(
                <Feature<LineString>>toSplit,
                boundary
            ).features
            const kept: Feature[] = []
            for (const f of splitup) {
                if (!GeoOperations.inside(GeoOperations.centerpointCoordinates(f), boundary)) {
                    continue
                }
                f.properties = { ...toSplit.properties }
                kept.push(f)
            }
            return kept
        }

        if (toSplit.geometry.type === "MultiLineString") {
            const lines: Feature<LineString>[][] = toSplit.geometry.coordinates.map(
                (coordinates) =>
                    turf.lineSplit(<LineString>{ type: "LineString", coordinates }, boundary)
                        .features
            )
            const splitted: Feature<LineString>[] = [].concat(...lines)
            const kept: Feature<LineString>[] = []
            for (const f of splitted) {
                if (!GeoOperations.inside(GeoOperations.centerpointCoordinates(f), boundary)) {
                    continue
                }
                f.properties = { ...toSplit.properties }
                kept.push(f)
            }
            return kept
        }
        if (toSplit.geometry.type === "Polygon" || toSplit.geometry.type == "MultiPolygon") {
            const splitup = turf.intersect(
                turf.featureCollection([<Feature<Polygon | MultiPolygon>>toSplit, boundary])
            )
            if (splitup === null) {
                // No intersection found.
                // Either: the boundary is contained fully in 'toSplit', 'toSplit' is contained fully in 'boundary' or they are unrelated at all
                if (GeoOperations.completelyWithin(toSplit, boundary)) {
                    return [toSplit]
                }
                if (
                    GeoOperations.completelyWithin(
                        boundary,
                        <Feature<Polygon | MultiPolygon>>toSplit
                    )
                ) {
                    return [
                        {
                            type: "Feature",
                            properties: { ...toSplit.properties },
                            geometry: boundary.geometry,
                            bbox: boundary.bbox,
                        },
                    ]
                }
                return []
            }
            splitup.properties = { ...toSplit.properties }
            return [splitup]
        }
        throw "Invalid geometry type with GeoOperations.clipWith: " + toSplit.geometry.type
    }

    /**
     *
     *
     * const f = (type, feature: Feature) => GeoOperations.featureToCoordinateWithRenderingType(feature, type)
     * const g = geometry => (<Feature> {type: "Feature", properties: {}, geometry})
     * f("point", g({type:"Point", coordinates:[1,2]})) // => [1,2]
     * f("centroid", g({type:"Point", coordinates:[1,2]})) // => undefined
     * f("start", g({type:"Point", coordinates:[1,2]})) // => undefined
     * f("centroid", g({type:"LineString", coordinates:[[1,2], [3,4]]})) // => [2,3]
     * f("centroid", g({type:"Polygon", coordinates:[[[1,2], [3,4], [1,2]]]})) // => [2,3]
     * f("projected_centerpoint", g({type:"LineString", coordinates:[[1,2], [3,4]]})) // => [ 1.9993134785863844, 3.000684536363483]
     * f("start", g({type:"LineString", coordinates:[[1,2], [3,4]]})) // => [1,2]
     * f("end", g({type:"LineString", coordinates:[[1,2], [3,4]]})) // => [3,4]
     *
     */
    public static featureToCoordinateWithRenderingType(
        feature: Feature,
        location:
            | "point"
            | "centroid"
            | "start"
            | "end"
            | "projected_centerpoint"
            | "polygon_centerpoint"
            | string
    ): [number, number] | undefined {
        switch (location) {
            case "point":
                if (feature.geometry.type === "Point") {
                    return <[number, number]>(<Feature<Point>>feature).geometry.coordinates
                }
                return undefined
            case "centroid":
                if (feature.geometry.type === "Point") {
                    return undefined
                }
                return GeoOperations.centerpointCoordinates(feature)
            case "polygon_centroid":
                if (feature.geometry.type === "Polygon") {
                    return GeoOperations.centerpointCoordinates(feature)
                }
                return undefined
            case "projected_centerpoint":
                if (
                    feature.geometry.type === "LineString" ||
                    feature.geometry.type === "MultiLineString"
                ) {
                    const centerpoint = GeoOperations.centerpointCoordinates(feature)
                    const projected = GeoOperations.nearestPoint(
                        <Feature<LineString>>feature,
                        centerpoint
                    )
                    return <[number, number]>projected.geometry.coordinates
                }
                return undefined
            case "start":
                if (feature.geometry.type === "LineString") {
                    return <[number, number]>(<Feature<LineString>>feature).geometry.coordinates[0]
                }
                return undefined
            case "end":
                if (feature.geometry.type === "LineString") {
                    return <[number, number]>(
                        (<Feature<LineString>>feature).geometry.coordinates.at(-1)
                    )
                }
                return undefined
            default:
                throw "Unknown location type: " + location + " for feature " + feature.properties.id
        }
    }

    /**
     * Creates a linestring object based on the outer ring of the given polygon
     *
     * Returns the argument if not a polygon
     * @param p
     */
    public static outerRing<P>(p: Feature<Polygon | LineString, P>): Feature<LineString, P> {
        if (p.geometry.type !== "Polygon") {
            return <Feature<LineString, P>>p
        }
        return {
            type: "Feature",
            properties: p.properties,
            geometry: {
                type: "LineString",
                coordinates: p.geometry.coordinates[0],
            },
        }
    }

    static centerpointCoordinatesObj(geojson: Feature) {
        const [lon, lat] = GeoOperations.centerpointCoordinates(geojson)
        return { lon, lat }
    }

    public static SplitSelfIntersectingWays(features: Feature[]): Feature[] {
        const result: Feature[] = []

        for (const feature of features) {
            if (feature.geometry.type === "LineString") {
                let coors = (<Feature<LineString>>feature).geometry.coordinates
                for (let i = coors.length - 1; i >= 0; i--) {
                    // Go back, to nick of the back when needed
                    const ci = coors[i]
                    for (let j = i + 1; j < coors.length; j++) {
                        const cj = coors[j]
                        if (
                            Math.abs(ci[0] - cj[0]) <= 0.000001 &&
                            Math.abs(ci[1] - cj[1]) <= 0.0000001
                        ) {
                            // Found a self-intersecting way!
                            console.debug("Splitting way", feature.properties.id)
                            result.push(<Feature>{
                                ...feature,
                                geometry: { ...feature.geometry, coordinates: coors.slice(i + 1) },
                            })
                            coors = coors.slice(0, i + 1)
                            break
                        }
                    }
                }
                result.push(<Feature>{
                    ...feature,
                    geometry: { ...feature.geometry, coordinates: coors },
                })
            }
        }

        return result
    }

    /**
     * GeoOperations.distanceToHuman(52.3) // => "50m"
     * GeoOperations.distanceToHuman(999) // => "1.0km"
     * GeoOperations.distanceToHuman(2800) // => "2.8km"
     * GeoOperations.distanceToHuman(12800) // => "13km"
     * GeoOperations.distanceToHuman(128000) // => "130km"
     *
     *
     * @param meters
     */
    public static distanceToHuman(meters: number): string {
        if (meters === undefined) {
            return ""
        }
        meters = Utils.roundHuman(Math.round(meters))
        if (meters < 1000) {
            return Utils.roundHuman(meters) + "m"
        }

        if (meters >= 10000) {
            const km = Utils.roundHuman(Math.round(meters / 1000))
            return km + "km"
        }

        meters = Math.round(meters / 100)
        const kmStr = "" + meters

        return kmStr.substring(0, kmStr.length - 1) + "." + kmStr.substring(kmStr.length - 1) + "km"
    }

    /**
     * Converts various types of possible bearings into degrees, with 0 being north, 90 being east.
     *
     * GeoOperations.parseBearing("N") // => 0
     * GeoOperations.parseBearing("E") // => 90
     * GeoOperations.parseBearing("NE") // => 45
     * GeoOperations.parseBearing("NNE") // => 22.5
     *
     * GeoOperations.parseBearing("90") // => 90
     * GeoOperations.parseBearing("-90°") // => 270
     * GeoOperations.parseBearing("180 °") // => 180
     *
     * GeoOperations.parseBearing(180) // => 180
     * GeoOperations.parseBearing(-270) // => 90
     *
     */
    public static parseBearing(str: string | number): number {
        let n: number
        if (typeof str === "string") {
            str = str.trim()
            if (str.endsWith("°")) {
                str = str.substring(0, str.length - 1).trim()
            }
            n = Number(str)
        } else {
            n = str
        }
        if (!isNaN(n)) {
            while (n < 0) {
                n += 360
            }
            return n % 360
        }
        return GeoOperations.reverseBearing[str]
    }

    /**
     * GeoOperations.bearingToHuman(0) // => "N"
     * GeoOperations.bearingToHuman(-9) // => "N"
     * GeoOperations.bearingToHuman(-10) // => "N"
     * GeoOperations.bearingToHuman(-180) // => "S"
     * GeoOperations.bearingToHuman(181) // => "S"
     * GeoOperations.bearingToHuman(46) // => "NE"
     */
    public static bearingToHuman(
        bearing: number
    ): "N" | "NE" | "E" | "SE" | "S" | "SW" | "W" | "NW" {
        while (bearing < 0) {
            bearing += 360
        }
        bearing %= 360
        bearing += 22.5
        const segment = Math.floor(bearing / 45) % GeoOperations.directions.length
        return GeoOperations.directions[segment]
    }

    /**
     * GeoOperations.bearingToHumanRelative(-207) // => "sharp_right"
     * GeoOperations.bearingToHumanRelative(-199) // => "behind"
     * GeoOperations.bearingToHumanRelative(-180) // => "behind"
     * GeoOperations.bearingToHumanRelative(-10) // => "straight"
     * GeoOperations.bearingToHumanRelative(0) // => "straight"
     * GeoOperations.bearingToHumanRelative(181) // => "behind"
     * GeoOperations.bearingToHumanRelative(40) // => "slight_right"
     * GeoOperations.bearingToHumanRelative(46) // => "slight_right"
     * GeoOperations.bearingToHumanRelative(95) // => "right"
     * GeoOperations.bearingToHumanRelative(140) // => "sharp_right"
     * GeoOperations.bearingToHumanRelative(158) // => "behind"
     *
     */
    public static bearingToHumanRelative(
        bearing: number
    ):
        | "straight"
        | "slight_right"
        | "right"
        | "sharp_right"
        | "behind"
        | "sharp_left"
        | "left"
        | "slight_left" {
        while (bearing < 0) {
            bearing += 360
        }
        bearing %= 360
        bearing += 22.5
        const segment = Math.floor(bearing / 45) % GeoOperations.directionsRelative.length
        return GeoOperations.directionsRelative[segment]
    }

    /**
     * const coors = [[[3.217198532946432,51.218067],[3.216807134449482,51.21849812105347],[3.2164304037883706,51.2189272]],[[3.2176208,51.21760169669458],[3.217198560167068,51.218067]]]
     * const f = <any> {geometry: {coordinates: coors}}
     * const merged = GeoOperations.attemptLinearize(f)
     * merged.geometry.coordinates // => [[3.2176208,51.21760169669458],[3.217198532946432,51.218067], [3.216807134449482,51.21849812105347],[3.2164304037883706,51.2189272]]
     */
    static attemptLinearize(
        multiLineStringFeature: Feature<MultiLineString>
    ): Feature<LineString | MultiLineString> {
        const coors = multiLineStringFeature.geometry.coordinates
        if (coors.length === 0) {
            console.error(multiLineStringFeature.geometry)
            throw "Error: got degenerate multilinestring"
        }
        outer: for (let i = coors.length - 1; i >= 0; i--) {
            // We try to match the first element of 'i' with another, earlier list `j`
            // If a match is found with `j`, j is extended and `i` is scrapped
            const iFirst = coors[i][0]
            for (let j = 0; j < coors.length; j++) {
                if (i == j) {
                    continue
                }

                const jLast = coors[j].at(-1)
                if (
                    !(
                        Math.abs(iFirst[0] - jLast[0]) < 0.000001 &&
                        Math.abs(iFirst[1] - jLast[1]) < 0.0000001
                    )
                ) {
                    continue
                }
                coors[j].splice(coors.length - 1, 1)
                coors[j].push(...coors[i])
                coors.splice(i, 1)
                continue outer
            }
        }
        if (coors.length === 0) {
            throw "No more coordinates found"
        }

        if (coors.length === 1) {
            return {
                type: "Feature",
                properties: multiLineStringFeature.properties,
                geometry: {
                    type: "LineString",
                    coordinates: coors[0],
                },
            }
        }
        return {
            type: "Feature",
            properties: multiLineStringFeature.properties,
            geometry: {
                type: "MultiLineString",
                coordinates: coors,
            },
        }
    }

    /**
     * Helper function which does the heavy lifting for 'inside'
     */
    private static pointInPolygonCoordinates(
        x: number,
        y: number,
        coordinates: [number, number][][]
    ): boolean {
        const inside = GeoOperations.pointWithinRing(
            x,
            y,
            /*This is the outer ring of the polygon */ coordinates[0]
        )
        if (!inside) {
            return false
        }
        for (let i = 1; i < coordinates.length; i++) {
            const inHole = GeoOperations.pointWithinRing(
                x,
                y,
                coordinates[i] /* These are inner rings, aka holes*/
            )
            if (inHole) {
                return false
            }
        }
        return true
    }

    private static pointWithinRing(x: number, y: number, ring: [number, number][]) {
        let inside = false
        for (let i = 0, j = ring.length - 1; i < ring.length; j = i++) {
            const coori = ring[i]
            const coorj = ring[j]

            const xi = coori[0]
            const yi = coori[1]
            const xj = coorj[0]
            const yj = coorj[1]

            const intersect = yi > y != yj > y && x < ((xj - xi) * (y - yi)) / (yj - yi) + xi
            if (intersect) {
                inside = !inside
            }
        }
        return inside
    }

    /**
     * Calculates the intersection between two features.
     * Returns the length if intersecting a linestring and a (multi)polygon (in meters), returns a surface area (in m²) if intersecting two (multi)polygons
     * Returns 0 if both are linestrings
     * Returns null if the features are not intersecting
     */
    private static calculateIntersection(
        feature,
        otherFeature,
        featureBBox: BBox,
        otherFeatureBBox?: BBox
    ): number {
        if (feature.geometry.type === "LineString") {
            otherFeatureBBox = otherFeatureBBox ?? BBox.get(otherFeature)
            const overlaps = featureBBox.overlapsWith(otherFeatureBBox)
            if (!overlaps) {
                return null
            }

            // Calculate the length of the intersection

            const intersectionPoints = turf.lineIntersect(feature, otherFeature)
            if (intersectionPoints.features.length == 0) {
                // No intersections.
                // If one point is inside of the polygon, all points are

                const coors = feature.geometry.coordinates
                const startCoor = coors[0]
                if (this.inside(startCoor, otherFeature)) {
                    return this.lengthInMeters(feature)
                }

                return null
            }
            const intersectionPointsArray = intersectionPoints.features.map((d) => {
                return d.geometry.coordinates
            })

            if (otherFeature.geometry.type === "LineString") {
                if (intersectionPointsArray.length > 0) {
                    return 0
                }
                return null
            }
            if (intersectionPointsArray.length == 1) {
                // We need to add the start- or endpoint of the current feature, depending on which one is embedded
                const coors = feature.geometry.coordinates
                const startCoor = coors[0]
                if (this.inside(startCoor, otherFeature)) {
                    // The startpoint is embedded
                    intersectionPointsArray.push(startCoor)
                } else {
                    intersectionPointsArray.push(coors[coors.length - 1])
                }
            }

            const intersection = turf.lineSlice(
                turf.point(intersectionPointsArray[0]),
                turf.point(intersectionPointsArray[1]),
                feature
            )

            if (intersection == null) {
                return null
            }
            const intersectionSize = turf.length(intersection) // in km
            return intersectionSize * 1000
        }

        if (feature.geometry.type === "Polygon" || feature.geometry.type === "MultiPolygon") {
            const otherFeatureBBox = BBox.get(otherFeature)
            const overlaps = featureBBox.overlapsWith(otherFeatureBBox)
            if (!overlaps) {
                return null
            }
            if (otherFeature.geometry.type === "LineString") {
                return this.calculateIntersection(
                    otherFeature,
                    feature,
                    otherFeatureBBox,
                    featureBBox
                )
            }

            try {
                const intersection = turf.intersect(turf.featureCollection([feature, otherFeature]))
                if (intersection == null) {
                    return null
                }
                return turf.area(intersection) // in m²
            } catch (e) {
                if (e.message === "Each LinearRing of a Polygon must have 4 or more Positions.") {
                    // WORKAROUND TIME!
                    // See https://github.com/Turfjs/turf/pull/2238
                    return null
                }
                if (e.message.indexOf("SweepLine tree") >= 0) {
                    console.log("Applying fallback intersection...")
                    const intersection = turf.intersect(
                        turf.featureCollection([
                            turf.truncate(feature),
                            turf.truncate(otherFeature),
                        ])
                    )
                    if (intersection == null) {
                        return null
                    }
                    return turf.area(intersection) // in m²
                    // Another workaround: https://github.com/Turfjs/turf/issues/2258
                }

                throw e
            }
        }
        throw "CalculateIntersection fallthrough: can not calculate an intersection between features"
    }
}
