using System.Collections.Immutable;

namespace OpenNest.Reporting;

public sealed record ReportPoint(double X, double Y);

public sealed record ReportBounds(double Left, double Bottom, double Right, double Top)
{
    public double Length => Right - Left;
    public double Width => Top - Bottom;
}

/// <summary>Native line or arc; angles are radians and a null center denotes a line.</summary>
public sealed record ReportSegment(ReportPoint Start, ReportPoint End, ReportPoint? Center,
    double Radius, double StartAngle, double SweepAngle);

public sealed record ReportContour(ImmutableArray<ReportSegment> Segments, bool Closed);

public sealed record ReportGeometry(ImmutableArray<ReportContour> Contours, ReportBounds Bounds)
{
    public bool StrokeOnly => Contours.Any(contour => !contour.Closed);
}

public sealed record ReportDrawing(string Id, string Name, long Required, long Nested,
    long Shortage, long Extra, ImmutableArray<int> Plates, ReportGeometry Geometry)
{
    /// <summary>
    /// Net weight of one part in <see cref="NestReportSnapshot.WeightUnits"/>; null when the nest
    /// has no thickness or the material has no density.
    /// </summary>
    public double? Weight { get; init; }
}

public sealed record ReportPlacement(string ReportId, ReportGeometry Geometry);

/// <summary>
/// A machine clamp footprint in the parts' placement frame. <paramref name="Removed"/> marks a
/// rail clamp taken off this sheet (by Auto Nest or by hand), which the operator pulls before cutting.
/// </summary>
public sealed record ReportClamp(string Id, ReportBounds Bounds, bool Removed);

public sealed record ReportPlate(int Number, ReportBounds Bounds, int Copies, double PartSpacing,
    double Utilization, ImmutableArray<ReportPlacement> Parts, ImmutableArray<ReportGeometry> Cutoffs)
{
    /// <summary>Estimated time to cut one copy of this plate; null when no estimate was requested.</summary>
    public TimeSpan? CutTime { get; init; }

    /// <summary>
    /// Weight of one full sheet (outline area x nest thickness x the nest material's density) in
    /// <see cref="NestReportSnapshot.WeightUnits"/>; null when the thickness or density is unknown.
    /// </summary>
    public double? Weight { get; init; }

    /// <summary>Clamps on this sheet, active and removed; display only, never material.</summary>
    public ImmutableArray<ReportClamp> Clamps { get; init; } = ImmutableArray<ReportClamp>.Empty;
}

/// <summary>A detached value snapshot. No domain objects or mutable geometry are retained.</summary>
public sealed record NestReportSnapshot(string Name, string Customer, string Notes, string Material,
    string Grade, double Thickness, string Units, DateTimeOffset GeneratedAt,
    ImmutableArray<ReportDrawing> Drawings, ImmutableArray<ReportPlate> Plates)
{
    public long TotalSheets => Plates.Aggregate(0L, (total, plate) => checked(total + plate.Copies));

    /// <summary>
    /// The name the nest machine's config gives this thickness ("16 ga"), shown before the
    /// decimal; empty when it has none. Reporting does not read machine configs, so the caller
    /// supplies it.
    /// </summary>
    public string ThicknessName { get; init; } = "";

    /// <summary>"lb" for inch jobs, "kg" for millimeter jobs.</summary>
    public string WeightUnits => Units == "mm" ? "kg" : "lb";

    /// <summary>True when the report carries estimated cut times.</summary>
    public bool HasCutTimes { get; init; }

    /// <summary>Every plate's estimate times its copies; null when the report has no estimates.</summary>
    public TimeSpan? TotalCutTime => !HasCutTimes
        ? null
        : Plates.Aggregate(TimeSpan.Zero, (total, plate) => total + (plate.CutTime ?? TimeSpan.Zero) * plate.Copies);
}