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using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.CSV
{
public class DynamicCsvFile : IDisposable
{
private bool _isDisposed;
private Stream _stream;
private StreamWriter _writer;
private bool _disposeStream;
private bool _columnsWritten;
public List<DynamicCsvFileColumn> Columns { get; set; }
public DynamicCsvFile()
{
Columns = new List<DynamicCsvFileColumn>();
}
public DynamicCsvFile(Stream stream) : this()
{
_stream = stream;
_writer = new StreamWriter(_stream);
}
public DynamicCsvFile(String file) : this(new FileStream(file, FileMode.Create))
{
_disposeStream = true;
}
private void WriteColumns()
{
if (!_columnsWritten)
{
_columnsWritten = true;
_writer.WriteLine(String.Join(",", Columns.Select(x => x.Name)));
}
}
public void Append(params Object[] values)
{
Append((IEnumerable)values);
}
public void Append<T>(IEnumerable<T> values, Func<T, Object> modifier = null)
{
if (modifier != null)
{
Append((IEnumerable)values, (x) => { return modifier((T)x); });
}
else
{
Append((IEnumerable)values, null);
}
}
public void Append(IEnumerable values, Func<Object, Object> modifier = null)
{
if (!_columnsWritten)
{
WriteColumns();
}
List<String> valuesStr = new List<string>();
foreach (var value in values)
{
Object finalValue = value;
if (modifier != null)
{
finalValue = modifier(finalValue);
}
valuesStr.Add(finalValue != null ? finalValue.ToString() : String.Empty);
}
_writer.WriteLine(String.Join(",", valuesStr));
_writer.Flush();
}
public void Dispose()
{
if (!_isDisposed)
{
_isDisposed = true;
if (_disposeStream)
{
_writer?.Dispose();
_stream?.Dispose();
}
}
}
}
}
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