// ============================================================================
// Copyright © 2026 Hexagon Technology Center GmbH. All Rights Reserved.
// 文件名: LineMeasurementProcessor.cs
// 描述: 直线测量算子，用于测量图像中两点之间的距离
// 功能:
//   - 用户指定两个点坐标（像素坐标）
//   - 计算两点之间的欧氏距离（像素单位）
//   - 支持像素尺寸标定，输出实际物理距离
//   - 在图像上绘制测量线和标注
//   - 输出测量结果供后续处理使用
// 算法: 欧氏距离计算
// 作者: 李伟 wei.lw.li@hexagon.com
// ============================================================================

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

namespace XP.ImageProcessing.Processors;

/// <summary>
/// 直线测量算子 - 测量两点之间的距离
/// </summary>
public class LineMeasurementProcessor : ImageProcessorBase
{
    private static readonly ILogger _logger = Log.ForContext<LineMeasurementProcessor>();

    public LineMeasurementProcessor()
    {
        Name = LocalizationHelper.GetString("LineMeasurementProcessor_Name");
        Description = LocalizationHelper.GetString("LineMeasurementProcessor_Description");
    }

    protected override void InitializeParameters()
    {
        Parameters.Add("X1", new ProcessorParameter(
            "X1",
            LocalizationHelper.GetString("LineMeasurementProcessor_X1"),
            typeof(int), 100, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_X1_Desc"))
            { IsVisible = false });

        Parameters.Add("Y1", new ProcessorParameter(
            "Y1",
            LocalizationHelper.GetString("LineMeasurementProcessor_Y1"),
            typeof(int), 100, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_Y1_Desc"))
            { IsVisible = false });

        Parameters.Add("X2", new ProcessorParameter(
            "X2",
            LocalizationHelper.GetString("LineMeasurementProcessor_X2"),
            typeof(int), 400, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_X2_Desc"))
            { IsVisible = false });

        Parameters.Add("Y2", new ProcessorParameter(
            "Y2",
            LocalizationHelper.GetString("LineMeasurementProcessor_Y2"),
            typeof(int), 400, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_Y2_Desc"))
            { IsVisible = false });

        Parameters.Add("PixelSize", new ProcessorParameter(
            "PixelSize",
            LocalizationHelper.GetString("LineMeasurementProcessor_PixelSize"),
            typeof(double), 1.0, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_PixelSize_Desc")));

        Parameters.Add("Unit", new ProcessorParameter(
            "Unit",
            LocalizationHelper.GetString("LineMeasurementProcessor_Unit"),
            typeof(string), "px", null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_Unit_Desc"),
            new string[] { "px", "mm", "μm", "cm" }));

        Parameters.Add("Thickness", new ProcessorParameter(
            "Thickness",
            LocalizationHelper.GetString("LineMeasurementProcessor_Thickness"),
            typeof(int), 2, 1, 10,
            LocalizationHelper.GetString("LineMeasurementProcessor_Thickness_Desc")));

        Parameters.Add("ShowLabel", new ProcessorParameter(
            "ShowLabel",
            LocalizationHelper.GetString("LineMeasurementProcessor_ShowLabel"),
            typeof(bool), true, null, null,
            LocalizationHelper.GetString("LineMeasurementProcessor_ShowLabel_Desc")));
    }

    public override Image<Gray, byte> Process(Image<Gray, byte> inputImage)
    {
        int x1 = GetParameter<int>("X1");
        int y1 = GetParameter<int>("Y1");
        int x2 = GetParameter<int>("X2");
        int y2 = GetParameter<int>("Y2");
        double pixelSize = GetParameter<double>("PixelSize");
        string unit = GetParameter<string>("Unit");
        int thickness = GetParameter<int>("Thickness");
        bool showLabel = GetParameter<bool>("ShowLabel");

        _logger.Debug("LineMeasurement: ({X1},{Y1}) -> ({X2},{Y2}), PixelSize={PixelSize}, Unit={Unit}",
            x1, y1, x2, y2, pixelSize, unit);

        OutputData.Clear();

        // 限制坐标在图像范围内
        x1 = Math.Clamp(x1, 0, inputImage.Width - 1);
        y1 = Math.Clamp(y1, 0, inputImage.Height - 1);
        x2 = Math.Clamp(x2, 0, inputImage.Width - 1);
        y2 = Math.Clamp(y2, 0, inputImage.Height - 1);

        // 计算像素距离
        double dx = x2 - x1;
        double dy = y2 - y1;
        double pixelDistance = Math.Sqrt(dx * dx + dy * dy);

        // 计算实际距离
        double actualDistance = pixelDistance * pixelSize;

        // 计算角度（相对于水平方向）
        double angleRad = Math.Atan2(dy, dx);
        double angleDeg = angleRad * 180.0 / Math.PI;

        // 存储测量结果
        OutputData["MeasurementType"] = "Line";
        OutputData["Point1"] = new Point(x1, y1);
        OutputData["Point2"] = new Point(x2, y2);
        OutputData["PixelDistance"] = pixelDistance;
        OutputData["ActualDistance"] = actualDistance;
        OutputData["Unit"] = unit;
        OutputData["Angle"] = angleDeg;
        OutputData["Thickness"] = thickness;
        OutputData["ShowLabel"] = showLabel;

        // 构建测量信息文本
        string distanceText = unit == "px"
            ? $"{pixelDistance:F2} px"
            : $"{actualDistance:F4} {unit} ({pixelDistance:F2} px)";

        OutputData["MeasurementText"] = distanceText;

        _logger.Information("LineMeasurement completed: Distance={Distance}, Angle={Angle:F2}°",
            distanceText, angleDeg);

        return inputImage.Clone();
    }
}