using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.ProcessPower.DataLinks;
using PRecAnnot.Abstractions;

namespace PRecAnnot.Plant3D2026;

// Converts an explicit AutoCAD selection to the small, AutoCAD-free candidate
// used by the line-number preview.  It deliberately performs no DataLinks or
// DWG write and reports unavailable Plant mappings as typed failures.
internal sealed class PlantLineNumberCandidateReader(DataLinksManager dataLinks)
{
    public LineNumberCandidateReadResult Read(ObjectId selectedId, string layer, string textStyle)
    {
        if (selectedId.IsNull || !selectedId.IsValid) return new(false, null, "LINE_NUMBER_SELECTION_INVALID");
        if (string.IsNullOrWhiteSpace(layer) || string.IsNullOrWhiteSpace(textStyle)) return new(false, null, "LINE_NUMBER_ASSET_CONTRACT_INVALID");
        try
        {
            var rowId = dataLinks.FindAcPpRowId(selectedId);
            if (rowId <= 0) return new(false, null, "LINE_NUMBER_DATALINKS_ROW_NOT_FOUND");
            var database = selectedId.Database;
            using var transaction = database.TransactionManager.StartOpenCloseTransaction();
            if (transaction.GetObject(selectedId, OpenMode.ForRead) is not Entity entity) return new(false, null, "LINE_NUMBER_SELECTION_NOT_ENTITY");
            var extents = entity.GeometricExtents;
            var center = new Point3d(
                (extents.MinPoint.X + extents.MaxPoint.X) / 2d,
                (extents.MinPoint.Y + extents.MaxPoint.Y) / 2d,
                (extents.MinPoint.Z + extents.MaxPoint.Z) / 2d);
            transaction.Commit();
            return new(true, new($"acad:{selectedId.Handle}", rowId, new(center.X, center.Y, center.Z), 0, layer, textStyle, new Dictionary<string, string?>()));
        }
        catch (Autodesk.AutoCAD.Runtime.Exception) { return new(false, null, "LINE_NUMBER_SELECTION_GEOMETRY_UNAVAILABLE"); }
        catch (DLException) { return new(false, null, "LINE_NUMBER_DATALINKS_ROW_NOT_FOUND"); }
        catch (Exception) { return new(false, null, "LINE_NUMBER_CANDIDATE_READ_FAILED"); }
    }
}