OpenNest/OpenNest.Engine/NestProgress.cs

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using OpenNest.Geometry;

namespace OpenNest.Engine
{
    [AttributeUsage(AttributeTargets.Field)]
    internal class ShortNameAttribute(string name) : Attribute
    {
        public string Name { get; } = name;
    }

    public enum NestPhase
    {
        [Description("Trying rotations..."), ShortName("Linear")]
        Linear,

        [Description("Trying best fit..."), ShortName("BestFit")]
        RectBestFit,

        [Description("Trying pairs..."), ShortName("Pairs")]
        Pairs,

        [Description("Trying extents..."), ShortName("Extents")]
        Extents,

        [Description("Custom"), ShortName("Custom")]
        Custom,
    }

    public static class NestPhaseExtensions
    {
        private static readonly ConcurrentDictionary<NestPhase, string> DisplayNames = new();
        private static readonly ConcurrentDictionary<NestPhase, string> ShortNames = new();

        public static string DisplayName(this NestPhase phase)
        {
            return DisplayNames.GetOrAdd(
                phase,
                p =>
                {
                    var field = typeof(NestPhase).GetField(p.ToString());
                    var attr = field?.GetCustomAttribute<DescriptionAttribute>();
                    return attr?.Description ?? p.ToString();
                }
            );
        }

        public static string ShortName(this NestPhase phase)
        {
            return ShortNames.GetOrAdd(
                phase,
                p =>
                {
                    var field = typeof(NestPhase).GetField(p.ToString());
                    var attr = field?.GetCustomAttribute<ShortNameAttribute>();
                    return attr?.Name ?? p.ToString();
                }
            );
        }
    }

    public class PhaseResult
    {
        public NestPhase Phase { get; set; }
        public int PartCount { get; set; }
        public long TimeMs { get; set; }

        public PhaseResult(NestPhase phase, int partCount, long timeMs)
        {
            Phase = phase;
            PartCount = partCount;
            TimeMs = timeMs;
        }
    }

    public class AngleResult
    {
        public double AngleDeg { get; set; }
        public NestDirection Direction { get; set; }
        public int PartCount { get; set; }
    }

    internal readonly struct ProgressReport
    {
        public NestPhase Phase { get; init; }
        public int PlateNumber { get; init; }
        public List<Part> Parts { get; init; }
        public Box WorkArea { get; init; }
        public string Description { get; init; }
        public bool IsOverallBest { get; init; }
    }

    public class NestProgress
    {
        public NestPhase Phase { get; set; }
        public int PlateNumber { get; set; }

        private List<Part> bestParts;
        public List<Part> BestParts
        {
            get => bestParts;
            set
            {
                bestParts = value;
                cachedParts = null;
            }
        }

        public string Description { get; set; }
        public Box ActiveWorkArea { get; set; }

        /// <summary>
        /// The sheet <see cref="BestParts"/> lie on when it is not the caller's plate (a whole-job
        /// engine's trial stock); null means the caller's own plate. Detached and never mutated.
        /// </summary>
        public Plate PreviewSheet { get; set; }

        public bool IsOverallBest { get; set; }

        public int BestPartCount => BestParts?.Count ?? 0;

        private List<Part> cachedParts;
        private Box cachedBounds;
        private double cachedPartArea;

        private void EnsureCache()
        {
            if (cachedParts == bestParts)
                return;
            cachedParts = bestParts;
            if (bestParts == null || bestParts.Count == 0)
            {
                cachedBounds = default;
                cachedPartArea = 0;
                return;
            }
            cachedBounds = bestParts.GetBoundingBox();
            cachedPartArea = 0;
            foreach (var p in bestParts)
                cachedPartArea += p.BaseDrawing.Area;
        }

        public double BestDensity
        {
            get
            {
                if (BestParts == null || BestParts.Count == 0)
                    return 0;
                EnsureCache();
                var bboxArea = cachedBounds.Width * cachedBounds.Length;
                return bboxArea > 0 ? cachedPartArea / bboxArea : 0;
            }
        }

        public double NestedWidth
        {
            get
            {
                if (BestParts == null || BestParts.Count == 0)
                    return 0;
                EnsureCache();
                return cachedBounds.Width;
            }
        }

        public double NestedLength
        {
            get
            {
                if (BestParts == null || BestParts.Count == 0)
                    return 0;
                EnsureCache();
                return cachedBounds.Length;
            }
        }

        public double NestedArea
        {
            get
            {
                if (BestParts == null || BestParts.Count == 0)
                    return 0;
                EnsureCache();
                return cachedPartArea;
            }
        }
    }
}