using GeoAPI.Geometries;
using HeuristicLab.Persistence.Core;
using HeuristicLab.Persistence.Interfaces;
using SharpMap.Data;
using SharpMap.Data.Providers;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;

namespace HeuristicLab.BioBoost.Persistence {

  public class GeometryFeatureProviderSerializer : ICompositeSerializer {

    #region ICompositeSerializer Members

    public int Priority { get { return 200; } }

    public bool CanSerialize(Type type) {
      return type == typeof (GeometryFeatureProvider);
    }

    public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
      var table = new FeatureDataTable();
      foreach (var tag in metaInfo)
        table.Columns.Add(tag.Name, (Type)tag.Value);
      return new GeometryFeatureProvider(table);
    }

    public IEnumerable<Tag> CreateMetaInfo(object obj) {
      var gfp = obj as GeometryFeatureProvider;
      return from DataColumn col in gfp.Features.Columns select new Tag(col.ColumnName, col.DataType);
    }

    public IEnumerable<Tag> Decompose(object obj) {
      var gfp = obj as GeometryFeatureProvider;
      foreach (FeatureDataRow row in gfp.Features.Rows) {
        yield return new Tag(row.ItemArray);
        yield return new Tag(row.Geometry);
      }
    }

    public string JustifyRejection(Type type) {
      return "Not a GeometryFeatureProvider";
    }

    public void Populate(object instance, IEnumerable<Tag> tags, Type type) {
      var gfp = instance as GeometryFeatureProvider;
      var it = tags.GetEnumerator();
      while (it.MoveNext()) {
        var row = (FeatureDataRow) gfp.Features.LoadDataRow((object[]) it.Current.Value, LoadOption.OverwriteChanges);
        if (it.MoveNext())
          row.Geometry = (IGeometry) it.Current.Value;
        else
          throw new PersistenceException("invalid data format for GeometryDataProvider: interleaved pairs of features and geometries expected");
      }
    }

    #endregion
  }
}