/*
  * Copyright (c) 2025 LG Electronics Inc.
   * SPDX-License-Identifier: LicenseRef-LGE-Proprietary
   */
using Aurora.Api;
using System;
using System.Runtime.InteropServices;

namespace VisionCommon {
    [Serializable]
    [StructLayout(LayoutKind.Sequential)]
    public struct PointData {
        public double X;
        public double Y;
    }

    public static class NativePattern {
        private const string FILE_NAME_VISION_DLL = "VisionCore.dll";
        private static Logger _Logger = new Logger("NativePattern");

        [DllImport(FILE_NAME_VISION_DLL)]
        extern private static PointData IntersectionPoint(
            double line1A, double line1B, double line1C,
            double line2A, double line2B, double line2C);

        [DllImport(FILE_NAME_VISION_DLL)]
        extern private static PointData VerticalIntersectionPoint(
            PointData line1Point,
            double line1A, double line1B, double line1C,
            double line2A, double line2B, double line2C);

        [DllImport(FILE_NAME_VISION_DLL)]
        extern private static double DistancePointToLine(
            PointData point,
            double lineA, double lineB, double lineC);

        /// <summary>
        /// 라인1,2 간에 교점 계산
        /// </summary>
        /// <param name="le1">라인1</param>
        /// <param name="le2">라인2</param>
        /// <returns>라인1,2 간에 교점</returns>
        public static T GetIntersectionPoint<T>(LineEquation le1, LineEquation le2) where T : DoublePoint {

            PointData pointData = IntersectionPoint(
                le1.A, le1.B, le1.C,
                le2.A, le2.B, le2.C);

            return (T)Activator.CreateInstance(typeof(T), pointData.X, pointData.Y);
        }

        /// <summary>
        /// 라인1을 지나는 점에서 수직인 라인과 라인2 간에 교점 계산
        /// </summary>
        /// <param name="le1Point">라인1을 지나는 점</param>
        /// <param name="le1">라인1</param>
        /// <param name="le2">라인2</param>
        /// <returns>라인1을 지나는 점에서 수직인 라인과 라인2 간에 교점</returns>
        public static ImagePoint GetVerticalIntersectionPoint(ImagePoint le1Point, LineEquation le1, LineEquation le2) {

            PointData le1PointData = new PointData() {
                X = le1Point.X,
                Y = le1Point.Y
            };

            PointData pointData = VerticalIntersectionPoint(
                le1PointData,
                le1.A, le1.B, le1.C,
                le2.A, le2.B, le2.C);

            return new ImagePoint(pointData.X, pointData.Y);
        }

        /// <summary>
        /// 점과 라인 간에 거리 계산
        /// </summary>
        /// <param name="point">점</param>
        /// <param name="le">라인</param>
        /// <returns>점과 라인 간에 거리</returns>
        public static double GetDistancePointToLine(ImagePoint point, LineEquation le) {

            PointData le1PointData = new PointData() {
                X = point.X,
                Y = point.Y
            };

            double distance = DistancePointToLine(
                le1PointData,
                le.A, le.B, le.C);

            return distance;
        }
    }
}