using System.Security.Cryptography;

using System.Text;

using TopModel.Generator.Core;

namespace TopModel.Generator;

public static class ModuleUtils

{

public static string? GetFolderHash(string path)

{

if (!Directory.Exists(path))

{

return null;

}

return GetHash(Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories), path);

}

public static string? GetHash(IEnumerable<string> f, string path)

{

var md5 = MD5.Create();

var files = f.Order().ToList();

foreach (var file in files)

{

var relativePath = Path.GetRelativePath(path, file).Replace('\\', '/');

var pathBytes = Encoding.UTF8.GetBytes(relativePath.ToLower());

md5.TransformBlock(pathBytes, 0, pathBytes.Length, pathBytes, 0);

var contentBytes = File.ReadAllBytes(file);

if (files.IndexOf(file) == files.Count - 1)

{

md5.TransformFinalBlock(contentBytes, 0, contentBytes.Length);

}

else

{

md5.TransformBlock(contentBytes, 0, contentBytes.Length, contentBytes, 0);

}

}

return md5.Hash != null ? BitConverter.ToString(md5.Hash).Replace("-", string.Empty).ToLower() : null;

}

public static Type? GetIGenRegInterface(Type t)

{

return t.GetInterfaces()

.FirstOrDefault(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IGeneratorRegistration<>));

}

public static (Type Type, string Name) GetIGenRegInterfaceAndName(Type generator)

{

var configType = GetIGenRegInterface(generator)!.GetGenericArguments()[0];

var configName = configType.Name.Replace("Config", string.Empty).ToLower();

return (configType, configName);

}

}