using System;
using System.IO;
using System.Text;

namespace CPF.ReoGrid.IO
{
	internal class CSVFileFormatProvider : IFileFormatProvider
	{
		public bool IsValidFormat(string file)
		{
			return Path.GetExtension(file).Equals(".csv", StringComparison.CurrentCultureIgnoreCase);
		}

		public bool IsValidFormat(Stream s)
		{
			throw new NotSupportedException();
		}

		public void Load(IWorkbook workbook, Stream stream, Encoding encoding, object arg)
		{
			bool autoSpread = true;
			int bufferLines = 512;
			RangePosition targetRange = RangePosition.EntireRange;
			CSVFormatArgument csvformatArgument = arg as CSVFormatArgument;
			bool flag = csvformatArgument != null;
			if (flag)
			{
				autoSpread = csvformatArgument.AutoSpread;
				bufferLines = csvformatArgument.BufferLines;
				targetRange = csvformatArgument.TargetRange;
			}
			bool flag2 = workbook.Worksheets.Count == 0;
			Worksheet worksheet;
			if (flag2)
			{
				worksheet = workbook.CreateWorksheet("Sheet1");
				workbook.Worksheets.Add(worksheet);
			}
			else
			{
				while (workbook.Worksheets.Count > 1)
				{
					workbook.Worksheets.RemoveAt(workbook.Worksheets.Count - 1);
				}
				worksheet = workbook.Worksheets[0];
				worksheet.Reset();
			}
			CSVFormat.Read(stream, worksheet, targetRange, encoding, bufferLines, autoSpread);
		}

		public void Save(IWorkbook workbook, Stream stream, Encoding encoding, object arg)
		{
			throw new NotSupportedException("Saving entire workbook as CSV is not supported, use Worksheet.ExportAsCSV instead.");
		}
	}
}