// ============================================================================
// 文件�? AngleMeasurementProcessor.cs
// 描述: 角度测量算子 �?共端点的两条直线夹角
// 功能:
//   - 用户定义三个点：端点(顶点)、射�?终点、射�?终点
//   - 计算两条射线之间的夹角（0°~180°�?
//   - 在图像上绘制两条射线、角度弧线和标注
// ============================================================================

using Emgu.CV;
using Emgu.CV.Structure;
using Serilog;
using System.Drawing;
using XP.ImageProcessing.Core;

namespace XP.ImageProcessing.Processors;

public class AngleMeasurementProcessor : ImageProcessorBase
{
    private static readonly ILogger _logger = Log.ForContext<AngleMeasurementProcessor>();

    public AngleMeasurementProcessor()
    {
        Name = LocalizationHelper.GetString("AngleMeasurementProcessor_Name");
        Description = LocalizationHelper.GetString("AngleMeasurementProcessor_Description");
    }

    protected override void InitializeParameters()
    {
        // 三个点坐标（由交互控件注入，使用 double 避免取整误差�?
        Parameters.Add("VX", new ProcessorParameter("VX", "VX", typeof(double), 250.0, null, null, "") { IsVisible = false });
        Parameters.Add("VY", new ProcessorParameter("VY", "VY", typeof(double), 250.0, null, null, "") { IsVisible = false });
        Parameters.Add("AX", new ProcessorParameter("AX", "AX", typeof(double), 100.0, null, null, "") { IsVisible = false });
        Parameters.Add("AY", new ProcessorParameter("AY", "AY", typeof(double), 250.0, null, null, "") { IsVisible = false });
        Parameters.Add("BX", new ProcessorParameter("BX", "BX", typeof(double), 250.0, null, null, "") { IsVisible = false });
        Parameters.Add("BY", new ProcessorParameter("BY", "BY", typeof(double), 100.0, null, null, "") { IsVisible = false });
    }

    public override Image<Gray, byte> Process(Image<Gray, byte> inputImage)
    {
        double vx = GetParameter<double>("VX"), vy = GetParameter<double>("VY");
        double ax = GetParameter<double>("AX"), ay = GetParameter<double>("AY");
        double bx = GetParameter<double>("BX"), by = GetParameter<double>("BY");

        OutputData.Clear();

        // 向量 VA �?VB
        double vax = ax - vx, vay = ay - vy;
        double vbx = bx - vx, vby = by - vy;

        double lenA = Math.Sqrt(vax * vax + vay * vay);
        double lenB = Math.Sqrt(vbx * vbx + vby * vby);

        double angleDeg = 0;
        if (lenA > 0.001 && lenB > 0.001)
        {
            double dot = vax * vbx + vay * vby;
            double cosAngle = Math.Clamp(dot / (lenA * lenB), -1.0, 1.0);
            angleDeg = Math.Acos(cosAngle) * 180.0 / Math.PI;
        }

        // 计算角度弧的起始角和扫过角（用于绘制弧线�?
        double angleA = Math.Atan2(vay, vax) * 180.0 / Math.PI;
        double angleB = Math.Atan2(vby, vbx) * 180.0 / Math.PI;

        // 确保�?angleA �?angleB 的扫过方向是较小的夹�?
        double sweep = angleB - angleA;
        if (sweep > 180) sweep -= 360;
        if (sweep < -180) sweep += 360;

        string angleText = $"{angleDeg:F2} deg";

        OutputData["AngleMeasurementResult"] = true;
        OutputData["Vertex"] = new Point((int)Math.Round(vx), (int)Math.Round(vy));
        OutputData["PointA"] = new Point((int)Math.Round(ax), (int)Math.Round(ay));
        OutputData["PointB"] = new Point((int)Math.Round(bx), (int)Math.Round(by));
        OutputData["AngleDeg"] = angleDeg;
        OutputData["ArcStartAngle"] = angleA;
        OutputData["ArcSweepAngle"] = sweep;
        OutputData["AngleText"] = angleText;

        _logger.Information("AngleMeasurement: Angle={Angle}, V=({VX},{VY}), A=({AX},{AY}), B=({BX},{BY})",
            angleText, vx, vy, ax, ay, bx, by);

        return inputImage.Clone();
    }
}