using System.IO;
using System.Security.Cryptography;

namespace MyNes.Core;

public class HelperTools
{
	public static string GetFileSize(string FilePath)
	{
		if (File.Exists(Path.GetFullPath(FilePath)))
		{
			FileInfo fileInfo = new FileInfo(FilePath);
			string text = " Byte";
			double num = fileInfo.Length;
			if (fileInfo.Length >= 1024)
			{
				num = (double)fileInfo.Length / 1024.0;
				text = " KB";
			}
			if (num >= 1024.0)
			{
				num /= 1024.0;
				text = " MB";
			}
			if (num >= 1024.0)
			{
				num /= 1024.0;
				text = " GB";
			}
			return num.ToString("F2") + text;
		}
		return "";
	}

	public static string GetSize(long size)
	{
		string text = " Byte";
		double num = size;
		if (size >= 1024)
		{
			num = (double)size / 1024.0;
			text = " KB";
		}
		if (num >= 1024.0)
		{
			num /= 1024.0;
			text = " MB";
		}
		if (num >= 1024.0)
		{
			num /= 1024.0;
			text = " GB";
		}
		if (num < 0.0)
		{
			return "???";
		}
		return num.ToString("F2") + text;
	}

	public static string GetSize(ulong size)
	{
		string text = " Byte";
		double num = size;
		if (size >= 1024)
		{
			num = (double)size / 1024.0;
			text = " KB";
		}
		if (num >= 1024.0)
		{
			num /= 1024.0;
			text = " MB";
		}
		if (num >= 1024.0)
		{
			num /= 1024.0;
			text = " GB";
		}
		if (num < 0.0)
		{
			return "???";
		}
		return num.ToString("F2") + text;
	}

	public static long GetSizeAsBytes(string FilePath)
	{
		if (File.Exists(FilePath))
		{
			return new FileInfo(FilePath).Length;
		}
		return 0L;
	}

	public static bool IsStringContainsNumbers(string text)
	{
		char[] array = text.ToCharArray();
		foreach (char c in array)
		{
			int result = 0;
			if (int.TryParse(c.ToString(), out result))
			{
				return true;
			}
		}
		return false;
	}

	public static string CalculateCRC(string filePath)
	{
		if (File.Exists(filePath))
		{
			Stream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
			byte[] buffer = new byte[stream.Length];
			stream.Read(buffer, 0, (int)stream.Length);
			stream.Close();
			string text = "";
			byte[] array = new Crc32().ComputeHash(buffer);
			foreach (byte b in array)
			{
				text += b.ToString("x2").ToLower();
			}
			return text;
		}
		return "";
	}

	public static string CalculateCRC(string filePath, int bytesToSkip)
	{
		if (File.Exists(filePath))
		{
			Stream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
			stream.Read(new byte[bytesToSkip], 0, bytesToSkip);
			byte[] buffer = new byte[stream.Length - bytesToSkip];
			stream.Read(buffer, 0, (int)(stream.Length - bytesToSkip));
			stream.Close();
			string text = "";
			byte[] array = new Crc32().ComputeHash(buffer);
			foreach (byte b in array)
			{
				text += b.ToString("x2").ToLower();
			}
			return text;
		}
		return "";
	}

	public static string CalculateSHA1(string filePath)
	{
		if (File.Exists(filePath))
		{
			byte[] buffer = GetBuffer(filePath);
			string text = "";
			byte[] array = new SHA1Managed().ComputeHash(buffer);
			foreach (byte b in array)
			{
				text += b.ToString("x2").ToLower();
			}
			return text;
		}
		return "";
	}

	public static byte[] GetBuffer(string filePath)
	{
		Stream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
		byte[] array = new byte[stream.Length];
		stream.Read(array, 0, (int)stream.Length);
		stream.Close();
		return array;
	}
}