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using System;
using System.IO;
using System.Security;
namespace PneumaticTube
{
internal class PercentProgressDisplay : IProgress<long>
{
private readonly bool _consoleCanReportProgress;
private readonly long _fileSize;
public PercentProgressDisplay(long fileSize)
{
_fileSize = fileSize;
_consoleCanReportProgress = true;
try
{
// This will throw an exception if we're running in ISE
var top = Console.CursorTop;
}
catch(SecurityException)
{
// No permission to mess with the console,
_consoleCanReportProgress = false;
}
catch(IOException)
{
// This console doesn't allow position setting
_consoleCanReportProgress = false;
}
}
public void Report(long value)
{
long percent = 0;
if(_fileSize > 0)
{
percent = 100*value/_fileSize;
}
if(_consoleCanReportProgress)
{
Console.SetCursorPosition(0, Console.CursorTop);
Console.Write($"{percent}% complete.");
}
if(percent >= 100)
{
if(!_consoleCanReportProgress)
{
Console.Write($"{percent}% complete.");
}
Console.Write("\n");
}
}
}
}