autodesk/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/LineNumberOwnedAnnotationReader.cs

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using PRecAnnot.Abstractions;

namespace PRecAnnot.Plant3D2026;

internal sealed class LineNumberOwnedAnnotationReader
{
    private const string ApplicationName = "PXP-LN";

    public IReadOnlyList<LineNumberOwnedRow> ReadList(Document document, ObjectId listId)
    {
        using var transaction = document.Database.TransactionManager.StartOpenCloseTransaction();
        if (transaction.GetObject(listId, OpenMode.ForRead) is not BlockReference list || !HasRole(list, "LIST"))
            throw new InvalidOperationException("LINE_NUMBER_LIST_NOT_SELECTED");

        var rows = new Dictionary<int, (string? StableId, string? Text)>();
        foreach (ObjectId id in list.AttributeCollection)
        {
            var attribute = (AttributeReference)transaction.GetObject(id, OpenMode.ForRead);
            var ownership = ReadOwnership(attribute);
            if (ownership is null) continue;
            rows.TryGetValue(ownership.Value.MarkerNumber, out var row);
            rows[ownership.Value.MarkerNumber] = ownership.Value.Role == "LINENUMBER"
                ? (ownership.Value.StableId, attribute.TextString.Replace("\\P", "\n", StringComparison.Ordinal))
                : (ownership.Value.StableId ?? row.StableId, row.Text);
        }

        var result = rows.OrderBy(value => value.Key)
            .Select(value => new LineNumberOwnedRow(
                value.Value.StableId ?? throw new InvalidOperationException("LINE_NUMBER_ROW_STABLE_ID_MISSING"),
                value.Key,
                value.Value.Text ?? throw new InvalidOperationException("LINE_NUMBER_ROW_TEXT_MISSING"),
                default))
            .ToArray();
        if (result.Length == 0) throw new InvalidOperationException("LINE_NUMBER_LIST_EMPTY");
        return result;
    }

    public LineNumberOwnedRow ReadMarker(Document document, ObjectId markerId)
    {
        using var transaction = document.Database.TransactionManager.StartOpenCloseTransaction();
        if (transaction.GetObject(markerId, OpenMode.ForRead) is not BlockReference marker)
            throw new InvalidOperationException("LINE_NUMBER_MARKER_NOT_SELECTED");
        var values = marker.GetXDataForApplication(ApplicationName)?.AsArray() ?? [];
        var stableId = values.Where(value => value.TypeCode == 1000).Select(value => value.Value as string)
            .FirstOrDefault(value => !string.Equals(value, "MARKER", StringComparison.OrdinalIgnoreCase));
        var markerNumber = values.Where(value => value.TypeCode == 1071).Select(value => Convert.ToInt32(value.Value)).FirstOrDefault();
        var text = values.Where(value => value.TypeCode == 1000).Select(value => value.Value as string).LastOrDefault() ?? string.Empty;
        if (string.IsNullOrWhiteSpace(stableId) || markerNumber <= 0) throw new InvalidOperationException("LINE_NUMBER_MARKER_OWNERSHIP_MISSING");
        var localPosition = Point3d.Origin;
        foreach (ObjectId id in marker.AttributeCollection)
        {
            var attribute = (AttributeReference)transaction.GetObject(id, OpenMode.ForRead);
            if (!string.Equals(attribute.Tag, "NUMBER", StringComparison.OrdinalIgnoreCase)) continue;
            localPosition = attribute.Position.TransformBy(marker.BlockTransform.Inverse());
            break;
        }
        return new(stableId, markerNumber, text, new(localPosition.X, localPosition.Y, localPosition.Z));
    }

    public IReadOnlyList<LineNumberOwnedRow> ReadMarkers(Document document)
    {
        using var transaction = document.Database.TransactionManager.StartOpenCloseTransaction();
        var blocks = (BlockTable)transaction.GetObject(document.Database.BlockTableId, OpenMode.ForRead);
        var paper = (BlockTableRecord)transaction.GetObject(blocks[BlockTableRecord.PaperSpace], OpenMode.ForRead);
        var rows = new List<LineNumberOwnedRow>();
        foreach (ObjectId id in paper)
        {
            if (transaction.GetObject(id, OpenMode.ForRead) is not BlockReference marker || !HasRole(marker, "MARKER")) continue;
            var values = marker.GetXDataForApplication(ApplicationName)?.AsArray() ?? [];
            var strings = values.Where(value => value.TypeCode == 1000).Select(value => value.Value as string).ToArray();
            var stableId = strings.FirstOrDefault(value => !string.Equals(value, "MARKER", StringComparison.OrdinalIgnoreCase));
            var markerNumber = values.Where(value => value.TypeCode == 1071).Select(value => Convert.ToInt32(value.Value)).FirstOrDefault();
            var text = strings.LastOrDefault() ?? string.Empty;
            if (string.IsNullOrWhiteSpace(stableId) || markerNumber <= 0) continue;
            rows.Add(new(stableId, markerNumber, text, default));
        }
        return rows.OrderBy(value => value.MarkerNumber).ThenBy(value => value.SourceStableId, StringComparer.Ordinal).ToArray();
    }

    private static bool HasRole(BlockReference reference, string role) =>
        reference.GetXDataForApplication(ApplicationName)?.AsArray().Any(value =>
            value.TypeCode == 1000 && string.Equals(value.Value as string, role, StringComparison.OrdinalIgnoreCase)) == true;

    private static (string? StableId, string Role, int MarkerNumber)? ReadOwnership(AttributeReference attribute)
    {
        var values = attribute.GetXDataForApplication(ApplicationName)?.AsArray();
        if (values is null) return null;
        var strings = values.Where(value => value.TypeCode == 1000).Select(value => value.Value as string).ToArray();
        var role = strings.FirstOrDefault(value => value is "MARKER" or "LINENUMBER");
        var number = values.Where(value => value.TypeCode == 1071).Select(value => Convert.ToInt32(value.Value)).FirstOrDefault();
        return role is null || number <= 0 ? null : (strings.FirstOrDefault(value => value != role), role, number);
    }
}