using System;

using System.Linq;

using System.IO;

using System.Reflection;

using System.Security.Cryptography;

namespace FlowTimer {

public static class FileSystem {

private static Assembly Asm;

private static MD5 MD5;

public static void Init() {

Asm = Assembly.GetExecutingAssembly();

MD5 = MD5.Create();

AppDomain.CurrentDomain.AssemblyResolve += (sender, args) => Assembly.Load(ReadPackedResource("FlowTimer.Dependencies.Newtonsoft.Json.dll"));

}

public static void UnpackAllFileExtensions(string extension, string destFolder) {

foreach(string file in Asm.GetManifestResourceNames()) {

if(file.StartsWith("FlowTimer.Resources")) {

string[] splitarray = file.Split('.');

string filename = splitarray[2];

string fileextension = splitarray[3];

if(fileextension.ToLower() == extension.ToLower()) {

Unpack(filename + "." + fileextension, destFolder + filename + "." + fileextension);

}

}

}

}

public static void Unpack(string src, string dest) {

string directory = Path.GetDirectoryName(dest);

if(!Directory.Exists(directory)) {

Directory.CreateDirectory(directory);

}

byte[] data = ReadPackedResource("FlowTimer.Resources." + src);

if(ShouldUnpack(data, dest)) {

Console.WriteLine("Unpacking " + src + " to " + dest);

File.WriteAllBytes(dest, data);

}

}

private static bool ShouldUnpack(byte[] data, string dest) {

if(!File.Exists(dest)) {

return true;

} else {

return !Enumerable.SequenceEqual(MD5.ComputeHash(data), MD5.ComputeHash(File.ReadAllBytes(dest)));

}

}

public static Stream ReadPackedResourceStream(string src) {

return Asm.GetManifestResourceStream(src);

}

public static byte[] ReadPackedResource(string src) {

using(Stream stream = ReadPackedResourceStream(src)) {

byte[] binary = new byte[stream.Length];

stream.Read(binary, 0, binary.Length);

return binary;

}

}

}

}