using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace verify_redm
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Reading cache list...");

            var inputFile = File.ReadAllLines("cache.sha1");
            var cacheList = new Dictionary<string, string>();

            foreach (var line in inputFile)
            {
                var line2 = line.Trim();
                line2 = line2.Replace("\"", "");
                line2 = line2.Replace("{", "");
                line2 = line2.Replace("}", "");

                if (String.IsNullOrWhiteSpace(line2))
                    continue;

                var split = line2.Split(',');

                var path = split[0].Trim();
                var hash = split[1].Trim();

                cacheList[path] = hash;
            }

            Console.WriteLine($"Got {cacheList.Keys.Count} file keys to check.");

            var targetDir = @"D:\RedM\cache\game";

            foreach (var entry in cacheList)
            {
                Console.ForegroundColor = ConsoleColor.Gray;
                var checkPath = Path.Combine(targetDir, entry.Key);
                Console.Write($"{checkPath} ...");

                if (File.Exists(checkPath))
                {
                    var hash = Hash(checkPath);

                    if (String.Equals(hash, entry.Value, StringComparison.InvariantCultureIgnoreCase))
                    {
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.WriteLine(" -> OK!");
                    }
                    else
                    {
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.WriteLine($" -> Expected {entry.Value}, got {hash}!");
                    }
                }
                else
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine(" -> File missing!");
                }
            }

            Console.WriteLine("Checks done.");
            Console.ReadKey(true);
        }

        static string Hash(string path)
        {
            using (FileStream fs = new FileStream(path, FileMode.Open))
            using (BufferedStream bs = new BufferedStream(fs))
            {
                using (SHA1Managed sha1 = new SHA1Managed())
                {
                    byte[] hash = sha1.ComputeHash(bs);
                    StringBuilder formatted = new StringBuilder(2 * hash.Length);
                    foreach (byte b in hash)
                    {
                        formatted.AppendFormat("{0:X2}", b);
                    }
                    return formatted.ToString();
                }
            }
        }
    }
}