using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using ToolPathParser;


namespace ClassicalCuttingForce
{
    /// <summary>
    /// 分情况进行经典切削力计算
    /// </summary>
    public class ClassicalCuttingForceCalculate
    {
        /// <summary>
        /// 按照轴向切深分组进行切削力计算
        /// </summary>
        public void AxialDepthGroupedForceCalculator(List<ToolPosition> toolPosList, CuttingForceCoefficients coefficients, ToolParameters toolParams)
        {

                int direction = SimpleMillingDirectionAnalyzer.AnalyzeDirection(toolPosList);

                List<List<ToolPosition>> allLayers = LayerSplitter.SplitIntoLayersByZ(toolPosList);

                List<List<ToolPosition>> firstDepthLayers = LayerSplitter.ExtractFirstAxialDepthLayers(allLayers);

                var LineCalculator = new LineForce();

                var ConcaveCurvesCalculator = new ConcaveCurvesForce();

                var ConvexCurvesCalculator = new ConvexCurvesForce();

            // 遍历每个提取到的层
            for (int i = 0; i < firstDepthLayers.Count; i++)
            {
                // 每个 firstDepthLayers[i] 就是对应层的 List<ToolPosition>
                List<ToolPosition> targetLayer = firstDepthLayers[i];

                double targetDepth = targetLayer[0].AxialDepth;

                int layerIndexInAllLayers = allLayers.IndexOf(targetLayer) + 1; 

                foreach (var point in targetLayer)
                {
                    if (direction == 1)//逆时针
                    {
                        if (point.SegmentType == 1)
                        {
                            LineCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                        }
                        else if (point.SegmentType == 2)
                        {
                            if (point.K == -1)
                            {
                                ConcaveCurvesCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                            }
                            else if (point.K == 1)
                            {
                                ConvexCurvesCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                            }

                        }
                    }
                    else if (direction == 2)//顺时针
                    {
                        if (point.SegmentType == 1)
                        {
                            LineCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                        }
                        else if (point.SegmentType == 2)
                        {
                            if (point.K == 1)
                            {
                                ConcaveCurvesCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                            }
                            else if (point.K == -1)
                            {
                                ConvexCurvesCalculator.CalculateCuttingForce(direction, point, coefficients, toolParams);
                            }

                        }
                    }
                    else
                    {
                        Console.WriteLine($"警告: 点数不足，无法判断方向");
                    }

                }

                new CuttingForceMapper().MapFirstLayerForceToSameDepth(allLayers, firstDepthLayers);

            }  

        }

    }




    /// <summary>
    /// 利用刀位点判断铣削方向
    /// </summary>
    public class SimpleMillingDirectionAnalyzer
    {
        public const int Clockwise = 2;      // 顺时针
        public const int CounterClockwise = 1; // 逆时针
        public const int Undetermined = 0;    // 无法确定

        public static int AnalyzeDirection(List<ToolPosition> allPoints)
        {
            if (allPoints == null || allPoints.Count < 3)
                return Undetermined;

            double targetZ = allPoints[0].Z;

            List<ToolPosition> layerPoints = new List<ToolPosition>();
            foreach (ToolPosition point in allPoints)
            {
                if (point.Z == targetZ)
                {
                    layerPoints.Add(point);
                }
            }

            if (layerPoints.Count < 3)
            {
                //Console.WriteLine($"警告: Z={targetZ}层的点数不足({layerPoints.Count})，无法判断方向");
                return Undetermined;
            }

            double area = CalculateSignedArea(layerPoints);

            if (Math.Abs(area) < 1e-10)
                return Undetermined;

            return area > 0 ? CounterClockwise : Clockwise;
        }


        // 计算有向面积
        private static double CalculateSignedArea(List<ToolPosition> points)
        {
            double area = 0;
            int n = points.Count;

            for (int i = 0; i < n; i++)
            {
                ToolPosition current = points[i];
                ToolPosition next = points[(i + 1) % n];

                area += (current.X * next.Y - next.X * current.Y);
            }

            return area / 2.0;
        }
    }



    /// <summary>
    /// 按刀位点原始顺序分层，提取所需要层
    /// </summary>
    public static class LayerSplitter
    {
        private const double Z_TOLERANCE = 0.001;

        /// <summary>
        /// 按刀位点原始顺序分层（先遇到的Z值先成为层）
        /// </summary>
        public static List<List<ToolPosition>> SplitIntoLayersByZ(List<ToolPosition> allPoints)
        {
            List<List<ToolPosition>> allLayers = new List<List<ToolPosition>>();

            if (allPoints == null || allPoints.Count == 0)
                return allLayers;

            foreach (var point in allPoints)
            {
                var existingLayer = allLayers.FirstOrDefault(layer =>
                    Math.Abs(layer[0].Z - point.Z) <= Z_TOLERANCE);

                if (existingLayer != null)
                {
                    existingLayer.Add(point);
                }
                else
                {
                    allLayers.Add(new List<ToolPosition> { point });
                }
            }

            return allLayers;
        }



        /// <summary>
        /// 从已分层的 allLayers 中，提取每个轴向切深首次出现的层
        /// </summary>
        /// <param name="allLayers">已按原始顺序分层的刀位点（外层=层，内层=该层点）</param>
        /// <returns>每个轴向切深首次出现的层集合（List<List<ToolPosition>>）</returns>
        public static List<List<ToolPosition>> ExtractFirstAxialDepthLayers(List<List<ToolPosition>> allLayers)
        {
            // 存储已出现过的轴向切深（用于去重，判断是否首次出现）
            HashSet<double> existedAxialDepths = new HashSet<double>();

            List<List<ToolPosition>> firstDepthLayers = new List<List<ToolPosition>>();

            const double AXIAL_DEPTH_TOLERANCE = 0.001;

            // 空值判断，避免报错
            if (allLayers == null || allLayers.Count == 0)
                return firstDepthLayers;

            // 按原始顺序遍历 allLayers 中的每一层
            foreach (var currentLayer in allLayers)
            {

                if (currentLayer == null || currentLayer.Count == 0)
                    continue;

                double currentAxialDepth = currentLayer[0].AxialDepth;

                bool isFirstAppearance = !existedAxialDepths
                    .Any(depth => Math.Abs(depth - currentAxialDepth) <= AXIAL_DEPTH_TOLERANCE);

                if (isFirstAppearance)
                {

                    existedAxialDepths.Add(currentAxialDepth);

                    firstDepthLayers.Add(currentLayer);
                }
            }

            return firstDepthLayers;
        }

    }



    public class CuttingForceMapper
    {
        private const double TOLERANCE = 0.001;

        /// <summary>
        /// 首层切削力映射到同切深其他层（按点索引复制）
        /// </summary>
        /// <param name="allLayers">所有分层（含首层+其他层）</param>
        /// <param name="firstDepthLayers">已计算切削力的首层集合</param>
        public void MapFirstLayerForceToSameDepth(List<List<ToolPosition>> allLayers, List<List<ToolPosition>> firstDepthLayers)
        {
            // 构建「切深→首层」映射
            var depthFirstLayerMap = firstDepthLayers
                .Where(layer => layer != null && layer.Count > 0)
                .ToDictionary(
                    layer => layer[0].AxialDepth,
                    layer => layer,
                    new DoubleEqualityComparer(TOLERANCE)
                );

            // 遍历所有层，复制切削力
            foreach (var currentLayer in allLayers)
            {
                if (currentLayer == null || currentLayer.Count == 0) continue;

                double currentDepth = currentLayer[0].AxialDepth;

                if (!depthFirstLayerMap.TryGetValue(currentDepth, out var firstLayer) || firstDepthLayers.Contains(currentLayer))
                    continue;

                if (firstLayer.Count != currentLayer.Count) continue;

                for (int i = 0; i < firstLayer.Count; i++)
                {
                    var firstPoint = firstLayer[i];
                    var currentPoint = currentLayer[i];

                    currentPoint.AverageFx = firstPoint.AverageFx;
                    currentPoint.AverageFy = firstPoint.AverageFy;
                    currentPoint.AverageFz = firstPoint.AverageFz;
                    currentPoint.MaxFx = firstPoint.MaxFx;
                    currentPoint.MaxFy = firstPoint.MaxFy;
                    currentPoint.MaxFz = firstPoint.MaxFz;
                }
            }
        }
        


        /// <summary>
        /// 自定义浮点数比较器
        /// </summary>
        private class DoubleEqualityComparer : IEqualityComparer<double>
        {
            private readonly double _tolerance;
            public DoubleEqualityComparer(double tolerance) => _tolerance = tolerance;
            public bool Equals(double x, double y) => Math.Abs(x - y) <= _tolerance;
            public int GetHashCode(double obj) => obj.ToString("F3").GetHashCode();
        }
    }

}