using System.Text;

var problems = 0;
foreach (string arg in args)
{
    var directories = new Stack<string>(Directory.GetDirectories(arg));
    var files = 0;

    while (directories.Count > 0)
    {
        string path = Path.GetFullPath(directories.Pop());

        foreach (string directory in Directory.EnumerateDirectories(path))
        {
            directories.Push(directory);
        }

        foreach (string file in Directory.EnumerateFiles(path, "*.cs"))
        {
            files++;
            await using var stream = File.OpenRead(file);
            using var reader = new StreamReader(stream, Encoding.UTF8);
            var blankLine = false;

            var lineNumber = 1;
            while (await reader.ReadLineAsync() is { } line)
            {
                if (string.IsNullOrWhiteSpace(line))
                {
                    if (blankLine)
                    {
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.Out.WriteLine($"{file}({lineNumber}): Double blank line");
                        Console.ResetColor();
                        problems++;
                    }

                    blankLine = true;
                }
                else
                {
                    blankLine = false;
                }

                if (line.Length > 130)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Out.WriteLine($"{file}({lineNumber}): Line is too long ({line.Length})");
                    Console.ResetColor();
                    problems++;
                }
                else if (line.Length > 0 && char.IsWhiteSpace(line[^1]))
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Out.WriteLine($"{file}({lineNumber}): Line contains trailing whitespace");
                    Console.ResetColor();
                    problems++;
                }

                lineNumber++;
            }
        }
    }

    Console.Out.WriteLine($"Finished scanning {files} files, {problems} problems encountered.");
}

return problems;