using System;

namespace MultiWheelC.TrajectoryPlanning.PathSmoothing;

/// <summary>一次 Local G2 平滑尝试的不可变诊断快照，适用于成功、取消和失败结果。</summary>
public sealed class PathSmoothingDiagnostics
{
    /// <summary>创建不可行、零耗时且没有终止原因的默认诊断快照。</summary>
    public PathSmoothingDiagnostics()
        : this(new PathQualityMetrics(), TimeSpan.Zero, string.Empty)
    {
    }

    /// <summary>创建平滑诊断快照。</summary>
    /// <param name="metrics">路径可行性、曲率、净空和相对变化的质量指标。</param>
    /// <param name="elapsed">从服务入口到终止的累计耗时。</param>
    /// <param name="terminationReason">可供调用方记录的成功、取消或失败原因；为 <see langword="null"/> 时为空字符串。</param>
    public PathSmoothingDiagnostics(
        PathQualityMetrics metrics,
        TimeSpan elapsed,
        string terminationReason = null)
    {
        Metrics = metrics ?? new PathQualityMetrics();
        Elapsed = elapsed;
        TerminationReason = terminationReason ?? string.Empty;
    }

    /// <summary>本次尝试的质量指标；未提供时为全零且不可行的默认指标。</summary>
    public PathQualityMetrics Metrics { get; }

    /// <summary>本次尝试的累计耗时，类型为 <see cref="TimeSpan"/>。</summary>
    public TimeSpan Elapsed { get; }

    /// <summary>终止原因文本；不承载可消费的部分路径。</summary>
    public string TerminationReason { get; }
}