"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var invariant_1 = require("@turf/invariant");
/**
 * Returns true if a point is on a line. Accepts a optional parameter to ignore the
 * start and end vertices of the linestring.
 *
 * @name booleanPointOnLine
 * @param {Coord} pt GeoJSON Point
 * @param {Feature<LineString>} line GeoJSON LineString
 * @param {Object} [options={}] Optional parameters
 * @param {boolean} [options.ignoreEndVertices=false] whether to ignore the start and end vertices.
 * @param {number} [options.epsilon] Fractional number to compare with the cross product result. Useful for dealing with floating points such as lng/lat points
 * @returns {boolean} true/false
 * @example
 * var pt = turf.point([0, 0]);
 * var line = turf.lineString([[-1, -1],[1, 1],[1.5, 2.2]]);
 * var isPointOnLine = turf.booleanPointOnLine(pt, line);
 * //=true
 */
function booleanPointOnLine(pt, line, options) {
    if (options === void 0) { options = {}; }
    // Normalize inputs
    var ptCoords = invariant_1.getCoord(pt);
    var lineCoords = invariant_1.getCoords(line);
    // Main
    for (var i = 0; i < lineCoords.length - 1; i++) {
        var ignoreBoundary = false;
        if (options.ignoreEndVertices) {
            if (i === 0) {
                ignoreBoundary = "start";
            }
            if (i === lineCoords.length - 2) {
                ignoreBoundary = "end";
            }
            if (i === 0 && i + 1 === lineCoords.length - 1) {
                ignoreBoundary = "both";
            }
        }
        if (isPointOnLineSegment(lineCoords[i], lineCoords[i + 1], ptCoords, ignoreBoundary, typeof options.epsilon === "undefined" ? null : options.epsilon)) {
            return true;
        }
    }
    return false;
}
// See http://stackoverflow.com/a/4833823/1979085
// See https://stackoverflow.com/a/328122/1048847
/**
 * @private
 * @param {Position} lineSegmentStart coord pair of start of line
 * @param {Position} lineSegmentEnd coord pair of end of line
 * @param {Position} pt coord pair of point to check
 * @param {boolean|string} excludeBoundary whether the point is allowed to fall on the line ends.
 * @param {number} epsilon Fractional number to compare with the cross product result. Useful for dealing with floating points such as lng/lat points
 * If true which end to ignore.
 * @returns {boolean} true/false
 */
function isPointOnLineSegment(lineSegmentStart, lineSegmentEnd, pt, excludeBoundary, epsilon) {
    var x = pt[0];
    var y = pt[1];
    var x1 = lineSegmentStart[0];
    var y1 = lineSegmentStart[1];
    var x2 = lineSegmentEnd[0];
    var y2 = lineSegmentEnd[1];
    var dxc = pt[0] - x1;
    var dyc = pt[1] - y1;
    var dxl = x2 - x1;
    var dyl = y2 - y1;
    var cross = dxc * dyl - dyc * dxl;
    if (epsilon !== null) {
        if (Math.abs(cross) > epsilon) {
            return false;
        }
    }
    else if (cross !== 0) {
        return false;
    }
    if (!excludeBoundary) {
        if (Math.abs(dxl) >= Math.abs(dyl)) {
            return dxl > 0 ? x1 <= x && x <= x2 : x2 <= x && x <= x1;
        }
        return dyl > 0 ? y1 <= y && y <= y2 : y2 <= y && y <= y1;
    }
    else if (excludeBoundary === "start") {
        if (Math.abs(dxl) >= Math.abs(dyl)) {
            return dxl > 0 ? x1 < x && x <= x2 : x2 <= x && x < x1;
        }
        return dyl > 0 ? y1 < y && y <= y2 : y2 <= y && y < y1;
    }
    else if (excludeBoundary === "end") {
        if (Math.abs(dxl) >= Math.abs(dyl)) {
            return dxl > 0 ? x1 <= x && x < x2 : x2 < x && x <= x1;
        }
        return dyl > 0 ? y1 <= y && y < y2 : y2 < y && y <= y1;
    }
    else if (excludeBoundary === "both") {
        if (Math.abs(dxl) >= Math.abs(dyl)) {
            return dxl > 0 ? x1 < x && x < x2 : x2 < x && x < x1;
        }
        return dyl > 0 ? y1 < y && y < y2 : y2 < y && y < y1;
    }
    return false;
}
exports.default = booleanPointOnLine;