using Ara3D.IfcParser;
using Ara3D.Logging;
using Ara3D.StepParser;
using Ara3D.Utils;

namespace Ara3D.IfcLoader
{
    public class IfcFile
    {
        public IfcGraph Graph;
        public StepDocument Document => Graph.Document;
        public IfcModel Model;
        public IntPtr ApiPtr;
        public FilePath FilePath;

        public IfcFile(FilePath fp, bool includeGeometry, ILogger? logger = null)
        {
            if (!File.Exists(fp))
                throw new FileNotFoundException($"File not found: {fp}");
            FilePath = fp;

            logger?.Log($"Starting load of {fp.GetFileName()}");
            if (includeGeometry)
            {
                Parallel.Invoke(
                    () => { LoadGeometryData(logger); },
                    () => { LoadNonGeometryData(logger); });
            }
            else
            {
                LoadNonGeometryData(logger);
            }
            logger?.Log($"Completed loading {fp.GetFileName()}");
        }

        private void LoadGeometryData(ILogger? logger)
        {
            logger?.Log($"Loading IFC geometry");
            ApiPtr = WebIfcDll.InitializeApi();
            Model = new IfcModel(this, ApiPtr, WebIfcDll.LoadModel(ApiPtr, FilePath));
            logger?.Log($"Completed loading IFC geometry");
        }

        private void LoadNonGeometryData(ILogger? logger)
        {
            logger?.Log($"Loading IFC data");
            Graph = IfcGraph.Load(FilePath, logger);
            logger?.Log($"Completed loading IFC data");
        }

        public static IfcFile Load(FilePath fp, bool includeGeometry, ILogger logger = null)
            => new IfcFile(fp, includeGeometry, logger);

        public bool GeometryDataLoaded 
            => Model != null;
    }
}