using System.Data;
using GB5Shared.DTO.Ice;
using IceImportDAL.DTO.IceImportPipeline;

namespace IceImportDAL.CustomCode.Parsers;

// IceMapIceSourceType = 2 (Xml). Matches legacy's actual approach — DataSet.ReadXml, one
// DataTable per distinct node name (legacy used DataSet.Tables[NodeName]). Every column comes
// back typed by DataSet.ReadXml's own inference; downstream field resolvers coerce as needed
// (same as Excel/CSV, whose columns are already all-string).
public class XmlSourceFileParser : ISourceFileParser
{
    public int SourceType => 2;

    public async Task<ParsedImportDataSetDTO> ParseAsync(
        Stream fileStream, string fileName, IceMapDTO mapDefinition, CancellationToken ct)
    {
        ct.ThrowIfCancellationRequested();

        using var ms = new MemoryStream();
        await fileStream.CopyToAsync(ms, ct).ConfigureAwait(false);
        ms.Position = 0;

        var ds = new DataSet();
        ds.ReadXml(ms);

        var result = new ParsedImportDataSetDTO { SourceFileName = fileName };
        foreach (DataTable table in ds.Tables)
            result.Tables[table.TableName] = table;

        return result;
    }
}